minimodem-0.23/0000775000175000017500000000000012661703421010421 500000000000000minimodem-0.23/Makefile.am0000664000175000017500000000002412037400725012367 00000000000000SUBDIRS = src tests minimodem-0.23/depcomp0000755000175000017500000005601612661703417011731 00000000000000#! /bin/sh # depcomp - compile a program generating dependencies as side-effects scriptversion=2013-05-30.07; # UTC # Copyright (C) 1999-2014 Free Software Foundation, Inc. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program. If not, see . # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # Originally written by Alexandre Oliva . case $1 in '') echo "$0: No command. Try '$0 --help' for more information." 1>&2 exit 1; ;; -h | --h*) cat <<\EOF Usage: depcomp [--help] [--version] PROGRAM [ARGS] Run PROGRAMS ARGS to compile a file, generating dependencies as side-effects. Environment variables: depmode Dependency tracking mode. source Source file read by 'PROGRAMS ARGS'. object Object file output by 'PROGRAMS ARGS'. DEPDIR directory where to store dependencies. depfile Dependency file to output. tmpdepfile Temporary file to use when outputting dependencies. libtool Whether libtool is used (yes/no). Report bugs to . EOF exit $? ;; -v | --v*) echo "depcomp $scriptversion" exit $? ;; esac # Get the directory component of the given path, and save it in the # global variables '$dir'. Note that this directory component will # be either empty or ending with a '/' character. This is deliberate. set_dir_from () { case $1 in */*) dir=`echo "$1" | sed -e 's|/[^/]*$|/|'`;; *) dir=;; esac } # Get the suffix-stripped basename of the given path, and save it the # global variable '$base'. set_base_from () { base=`echo "$1" | sed -e 's|^.*/||' -e 's/\.[^.]*$//'` } # If no dependency file was actually created by the compiler invocation, # we still have to create a dummy depfile, to avoid errors with the # Makefile "include basename.Plo" scheme. make_dummy_depfile () { echo "#dummy" > "$depfile" } # Factor out some common post-processing of the generated depfile. # Requires the auxiliary global variable '$tmpdepfile' to be set. aix_post_process_depfile () { # If the compiler actually managed to produce a dependency file, # post-process it. if test -f "$tmpdepfile"; then # Each line is of the form 'foo.o: dependency.h'. # Do two passes, one to just change these to # $object: dependency.h # and one to simply output # dependency.h: # which is needed to avoid the deleted-header problem. { sed -e "s,^.*\.[$lower]*:,$object:," < "$tmpdepfile" sed -e "s,^.*\.[$lower]*:[$tab ]*,," -e 's,$,:,' < "$tmpdepfile" } > "$depfile" rm -f "$tmpdepfile" else make_dummy_depfile fi } # A tabulation character. tab=' ' # A newline character. nl=' ' # Character ranges might be problematic outside the C locale. # These definitions help. upper=ABCDEFGHIJKLMNOPQRSTUVWXYZ lower=abcdefghijklmnopqrstuvwxyz digits=0123456789 alpha=${upper}${lower} if test -z "$depmode" || test -z "$source" || test -z "$object"; then echo "depcomp: Variables source, object and depmode must be set" 1>&2 exit 1 fi # Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po. depfile=${depfile-`echo "$object" | sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`} tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`} rm -f "$tmpdepfile" # Avoid interferences from the environment. gccflag= dashmflag= # Some modes work just like other modes, but use different flags. We # parameterize here, but still list the modes in the big case below, # to make depend.m4 easier to write. Note that we *cannot* use a case # here, because this file can only contain one case statement. if test "$depmode" = hp; then # HP compiler uses -M and no extra arg. gccflag=-M depmode=gcc fi if test "$depmode" = dashXmstdout; then # This is just like dashmstdout with a different argument. dashmflag=-xM depmode=dashmstdout fi cygpath_u="cygpath -u -f -" if test "$depmode" = msvcmsys; then # This is just like msvisualcpp but w/o cygpath translation. # Just convert the backslash-escaped backslashes to single forward # slashes to satisfy depend.m4 cygpath_u='sed s,\\\\,/,g' depmode=msvisualcpp fi if test "$depmode" = msvc7msys; then # This is just like msvc7 but w/o cygpath translation. # Just convert the backslash-escaped backslashes to single forward # slashes to satisfy depend.m4 cygpath_u='sed s,\\\\,/,g' depmode=msvc7 fi if test "$depmode" = xlc; then # IBM C/C++ Compilers xlc/xlC can output gcc-like dependency information. gccflag=-qmakedep=gcc,-MF depmode=gcc fi case "$depmode" in gcc3) ## gcc 3 implements dependency tracking that does exactly what ## we want. Yay! Note: for some reason libtool 1.4 doesn't like ## it if -MD -MP comes after the -MF stuff. Hmm. ## Unfortunately, FreeBSD c89 acceptance of flags depends upon ## the command line argument order; so add the flags where they ## appear in depend2.am. Note that the slowdown incurred here ## affects only configure: in makefiles, %FASTDEP% shortcuts this. for arg do case $arg in -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;; *) set fnord "$@" "$arg" ;; esac shift # fnord shift # $arg done "$@" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi mv "$tmpdepfile" "$depfile" ;; gcc) ## Note that this doesn't just cater to obsosete pre-3.x GCC compilers. ## but also to in-use compilers like IMB xlc/xlC and the HP C compiler. ## (see the conditional assignment to $gccflag above). ## There are various ways to get dependency output from gcc. Here's ## why we pick this rather obscure method: ## - Don't want to use -MD because we'd like the dependencies to end ## up in a subdir. Having to rename by hand is ugly. ## (We might end up doing this anyway to support other compilers.) ## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like ## -MM, not -M (despite what the docs say). Also, it might not be ## supported by the other compilers which use the 'gcc' depmode. ## - Using -M directly means running the compiler twice (even worse ## than renaming). if test -z "$gccflag"; then gccflag=-MD, fi "$@" -Wp,"$gccflag$tmpdepfile" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" echo "$object : \\" > "$depfile" # The second -e expression handles DOS-style file names with drive # letters. sed -e 's/^[^:]*: / /' \ -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile" ## This next piece of magic avoids the "deleted header file" problem. ## The problem is that when a header file which appears in a .P file ## is deleted, the dependency causes make to die (because there is ## typically no way to rebuild the header). We avoid this by adding ## dummy dependencies for each header file. Too bad gcc doesn't do ## this for us directly. ## Some versions of gcc put a space before the ':'. On the theory ## that the space means something, we add a space to the output as ## well. hp depmode also adds that space, but also prefixes the VPATH ## to the object. Take care to not repeat it in the output. ## Some versions of the HPUX 10.20 sed can't process this invocation ## correctly. Breaking it into two sed invocations is a workaround. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^\\$//' -e '/^$/d' -e "s|.*$object$||" -e '/:$/d' \ | sed -e 's/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; hp) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; sgi) if test "$libtool" = yes; then "$@" "-Wp,-MDupdate,$tmpdepfile" else "$@" -MDupdate "$tmpdepfile" fi stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" if test -f "$tmpdepfile"; then # yes, the sourcefile depend on other files echo "$object : \\" > "$depfile" # Clip off the initial element (the dependent). Don't try to be # clever and replace this with sed code, as IRIX sed won't handle # lines with more than a fixed number of characters (4096 in # IRIX 6.2 sed, 8192 in IRIX 6.5). We also remove comment lines; # the IRIX cc adds comments like '#:fec' to the end of the # dependency line. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' \ | tr "$nl" ' ' >> "$depfile" echo >> "$depfile" # The second pass generates a dummy entry for each header file. tr ' ' "$nl" < "$tmpdepfile" \ | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \ >> "$depfile" else make_dummy_depfile fi rm -f "$tmpdepfile" ;; xlc) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; aix) # The C for AIX Compiler uses -M and outputs the dependencies # in a .u file. In older versions, this file always lives in the # current directory. Also, the AIX compiler puts '$object:' at the # start of each line; $object doesn't have directory information. # Version 6 uses the directory in both cases. set_dir_from "$object" set_base_from "$object" if test "$libtool" = yes; then tmpdepfile1=$dir$base.u tmpdepfile2=$base.u tmpdepfile3=$dir.libs/$base.u "$@" -Wc,-M else tmpdepfile1=$dir$base.u tmpdepfile2=$dir$base.u tmpdepfile3=$dir$base.u "$@" -M fi stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" exit $stat fi for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" do test -f "$tmpdepfile" && break done aix_post_process_depfile ;; tcc) # tcc (Tiny C Compiler) understand '-MD -MF file' since version 0.9.26 # FIXME: That version still under development at the moment of writing. # Make that this statement remains true also for stable, released # versions. # It will wrap lines (doesn't matter whether long or short) with a # trailing '\', as in: # # foo.o : \ # foo.c \ # foo.h \ # # It will put a trailing '\' even on the last line, and will use leading # spaces rather than leading tabs (at least since its commit 0394caf7 # "Emit spaces for -MD"). "$@" -MD -MF "$tmpdepfile" stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" # Each non-empty line is of the form 'foo.o : \' or ' dep.h \'. # We have to change lines of the first kind to '$object: \'. sed -e "s|.*:|$object :|" < "$tmpdepfile" > "$depfile" # And for each line of the second kind, we have to emit a 'dep.h:' # dummy dependency, to avoid the deleted-header problem. sed -n -e 's|^ *\(.*\) *\\$|\1:|p' < "$tmpdepfile" >> "$depfile" rm -f "$tmpdepfile" ;; ## The order of this option in the case statement is important, since the ## shell code in configure will try each of these formats in the order ## listed in this file. A plain '-MD' option would be understood by many ## compilers, so we must ensure this comes after the gcc and icc options. pgcc) # Portland's C compiler understands '-MD'. # Will always output deps to 'file.d' where file is the root name of the # source file under compilation, even if file resides in a subdirectory. # The object file name does not affect the name of the '.d' file. # pgcc 10.2 will output # foo.o: sub/foo.c sub/foo.h # and will wrap long lines using '\' : # foo.o: sub/foo.c ... \ # sub/foo.h ... \ # ... set_dir_from "$object" # Use the source, not the object, to determine the base name, since # that's sadly what pgcc will do too. set_base_from "$source" tmpdepfile=$base.d # For projects that build the same source file twice into different object # files, the pgcc approach of using the *source* file root name can cause # problems in parallel builds. Use a locking strategy to avoid stomping on # the same $tmpdepfile. lockdir=$base.d-lock trap " echo '$0: caught signal, cleaning up...' >&2 rmdir '$lockdir' exit 1 " 1 2 13 15 numtries=100 i=$numtries while test $i -gt 0; do # mkdir is a portable test-and-set. if mkdir "$lockdir" 2>/dev/null; then # This process acquired the lock. "$@" -MD stat=$? # Release the lock. rmdir "$lockdir" break else # If the lock is being held by a different process, wait # until the winning process is done or we timeout. while test -d "$lockdir" && test $i -gt 0; do sleep 1 i=`expr $i - 1` done fi i=`expr $i - 1` done trap - 1 2 13 15 if test $i -le 0; then echo "$0: failed to acquire lock after $numtries attempts" >&2 echo "$0: check lockdir '$lockdir'" >&2 exit 1 fi if test $stat -ne 0; then rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" # Each line is of the form `foo.o: dependent.h', # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'. # Do two passes, one to just change these to # `$object: dependent.h' and one to simply `dependent.h:'. sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile" # Some versions of the HPUX 10.20 sed can't process this invocation # correctly. Breaking it into two sed invocations is a workaround. sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" \ | sed -e 's/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; hp2) # The "hp" stanza above does not work with aCC (C++) and HP's ia64 # compilers, which have integrated preprocessors. The correct option # to use with these is +Maked; it writes dependencies to a file named # 'foo.d', which lands next to the object file, wherever that # happens to be. # Much of this is similar to the tru64 case; see comments there. set_dir_from "$object" set_base_from "$object" if test "$libtool" = yes; then tmpdepfile1=$dir$base.d tmpdepfile2=$dir.libs/$base.d "$@" -Wc,+Maked else tmpdepfile1=$dir$base.d tmpdepfile2=$dir$base.d "$@" +Maked fi stat=$? if test $stat -ne 0; then rm -f "$tmpdepfile1" "$tmpdepfile2" exit $stat fi for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" do test -f "$tmpdepfile" && break done if test -f "$tmpdepfile"; then sed -e "s,^.*\.[$lower]*:,$object:," "$tmpdepfile" > "$depfile" # Add 'dependent.h:' lines. sed -ne '2,${ s/^ *// s/ \\*$// s/$/:/ p }' "$tmpdepfile" >> "$depfile" else make_dummy_depfile fi rm -f "$tmpdepfile" "$tmpdepfile2" ;; tru64) # The Tru64 compiler uses -MD to generate dependencies as a side # effect. 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"$@" || exit $? # Remove the call to Libtool. if test "$libtool" = yes; then while test "X$1" != 'X--mode=compile'; do shift done shift fi # Remove '-o $object'. IFS=" " for arg do case $arg in -o) shift ;; $object) shift ;; *) set fnord "$@" "$arg" shift # fnord shift # $arg ;; esac done "$@" -E \ | sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \ -e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \ | sed '$ s: \\$::' > "$tmpdepfile" rm -f "$depfile" echo "$object : \\" > "$depfile" cat < "$tmpdepfile" >> "$depfile" sed < "$tmpdepfile" '/^$/d;s/^ //;s/ \\$//;s/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; msvisualcpp) # Important note: in order to support this mode, a compiler *must* # always write the preprocessed file to stdout. "$@" || exit $? # Remove the call to Libtool. if test "$libtool" = yes; then while test "X$1" != 'X--mode=compile'; do shift done shift fi IFS=" " for arg do case "$arg" in -o) shift ;; $object) shift ;; "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI") set fnord "$@" shift shift ;; *) set fnord "$@" "$arg" shift shift ;; esac done "$@" -E 2>/dev/null | sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile" rm -f "$depfile" echo "$object : \\" > "$depfile" sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::'"$tab"'\1 \\:p' >> "$depfile" echo "$tab" >> "$depfile" sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile" rm -f "$tmpdepfile" ;; msvcmsys) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; none) exec "$@" ;; *) echo "Unknown depmode $depmode" 1>&2 exit 1 ;; esac exit 0 # Local Variables: # mode: shell-script # sh-indentation: 2 # eval: (add-hook 'write-file-hooks 'time-stamp) # time-stamp-start: "scriptversion=" # time-stamp-format: "%:y-%02m-%02d.%02H" # time-stamp-time-zone: "UTC" # time-stamp-end: "; # UTC" # End: minimodem-0.23/README0000664000175000017500000000136612661672562011242 00000000000000minimodem - general-purpose software audio FSK modem Copyright (C) 2011-2016 Kamal Mostafa Minimodem is a command-line program which decodes (or generates) audio modem tones at any specified baud rate, using various framing protocols. It acts a general-purpose software FSK modem, and includes support for various standard FSK protocols such as Bell103, Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID. Minimodem can play and capture audio modem tones in real-time via the system audio device, or in batched mode via audio files. Minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers using radio, telephone, or another audio communications medium. minimodem-0.23/aclocal.m40000664000175000017500000014624312661703416012217 00000000000000# generated automatically by aclocal 1.15 -*- Autoconf -*- # Copyright (C) 1996-2014 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])]) m4_ifndef([AC_AUTOCONF_VERSION], [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.69],, [m4_warning([this file was generated for autoconf 2.69. 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See the GNU dnl General Public License for more details. dnl dnl You should have received a copy of the GNU General Public License dnl along with this program; if not, write to the Free Software dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA dnl 02111-1307, USA. dnl dnl As a special exception to the GNU General Public License, if you dnl distribute this file as part of a program that contains a dnl configuration script generated by Autoconf, you may include it under dnl the same distribution terms that you use for the rest of that dnl program. dnl PKG_PREREQ(MIN-VERSION) dnl ----------------------- dnl Since: 0.29 dnl dnl Verify that the version of the pkg-config macros are at least dnl MIN-VERSION. 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Generated from configure.ac by autoheader. */ /* Name of package */ #undef PACKAGE /* Define to the address where bug reports for this package should be sent. */ #undef PACKAGE_BUGREPORT /* Define to the full name of this package. */ #undef PACKAGE_NAME /* Define to the full name and version of this package. */ #undef PACKAGE_STRING /* Define to the one symbol short name of this package. */ #undef PACKAGE_TARNAME /* Define to the home page for this package. */ #undef PACKAGE_URL /* Define to the version of this package. */ #undef PACKAGE_VERSION /* Define to 1 to enable ALSA support */ #undef USE_ALSA /* Define to 1 to enable internal benchmarks */ #undef USE_BENCHMARKS /* Define to 1 to enable pulseaudio support */ #undef USE_PULSEAUDIO /* Define to 1 to enable sndfile support */ #undef USE_SNDFILE /* Version number of package */ #undef VERSION minimodem-0.23/tests/0000775000175000017500000000000012661703421011563 500000000000000minimodem-0.23/tests/Makefile.am0000664000175000017500000000146612432217625013550 00000000000000# # Makefile.am # # Copyright (C) 2011-2012 Kamal Mostafa # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # EXTRA_DIST = \ run-self-tests \ self-test \ *.test \ testdata-* TESTS = @auto_find_tests@ minimodem-0.23/tests/02-self-test-300.test0000775000175000017500000000005012432217625015031 00000000000000exec ./self-test testdata-ascii.txt 300 minimodem-0.23/tests/12-verify-perfect-lut16.test0000775000175000017500000000013312432217625016531 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=16 minimodem-0.23/tests/81-tdd.test0000775000175000017500000000005112650245143013404 00000000000000exec ./self-test testdata-baudot.txt tdd minimodem-0.23/tests/71-callerid-sdmf.test0000775000175000017500000000010612432217625015341 00000000000000#!/bin/bash exec ./70-callerid-mdmf.test testdata-callerid-sdmf.bytes minimodem-0.23/tests/testdata-ascii.txt0000664000175000017500000000076412661674513015163 00000000000000This is a minimodem ascii data test file. http://www.whence.com/minimodem/ THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG the quick brown fox jumps over the lazy dog 1234567890 !@#$%^&*()-=_+`~[]\;',./{}|:"<>? tab> Aluminum tube Three hundred twenty sardines Earning our SkyMiles ---------------------------------------------------------------------------- minimodem-0.23/tests/05-self-test-12000.test0000775000175000017500000000005212432217625015176 00000000000000exec ./self-test testdata-ascii.txt 12000 minimodem-0.23/tests/01-self-test-1200.test0000775000175000017500000000005112432217625015111 00000000000000exec ./self-test testdata-ascii.txt 1200 minimodem-0.23/tests/run-self-tests0000775000175000017500000000022312432217625014323 00000000000000#!/bin/bash for testcase in ./*.test do $testcase if [ $? -eq 0 ] then echo "PASS: $testcase" else echo "FAIL: $testcase" fi done minimodem-0.23/tests/Makefile.in0000664000175000017500000006134612661703417013567 00000000000000# Makefile.in generated by automake 1.15 from Makefile.am. # @configure_input@ # Copyright (C) 1994-2014 Free Software Foundation, Inc. # This Makefile.in is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. @SET_MAKE@ # # Makefile.am # # Copyright (C) 2011-2012 Kamal Mostafa # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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HERE ARE SOME MORE: A1A1A1 2B2B2B TUE JUN 21 14:22:36 PDT 2011. THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG? YES, HE DOES! minimodem-0.23/tests/testdata-callerid-sdmf.bytes0000664000175000017500000000002512036617132017064 00000000000000093012246095551212Qminimodem-0.23/tests/60-multibyte.test0000775000175000017500000000005512432217625014652 00000000000000exec ./self-test testdata-multibyte.txt 1200 minimodem-0.23/tests/testdata-callerid-mdmf.txt0000664000175000017500000000010112036617132016542 00000000000000CALLER-ID Time: 03/24 09:02 Name: JOHN DOE Phone: 800-555-1212 minimodem-0.23/tests/10-verify-perfect.test0000775000175000017500000000023412432217625015560 00000000000000# test for confidence=1.00 when using exact integer multiple frequencies exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 minimodem-0.23/tests/testdata-callerid-sdmf.txt0000664000175000017500000000006112036617132016555 00000000000000CALLER-ID Time: 09/30 12:24 Phone: 609-555-1212 minimodem-0.23/tests/41-noise-purefreqs.test0000775000175000017500000000005212432217625015757 00000000000000exec ./40-noise.test 1200 -M 1200 -S 2400 minimodem-0.23/tests/15-verify-perfect-float.test0000775000175000017500000000014212432217625016666 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --float-samples minimodem-0.23/tests/06-self-test-float-samples.test0000775000175000017500000000007212432217625017306 00000000000000exec ./self-test testdata-ascii.txt --float-samples 12000 minimodem-0.23/tests/21-rate-slop.test0000775000175000017500000000073012432217625014537 00000000000000#!/bin/bash let rx_rate=300 let count=0 let fail=0 function try_tx_rx_rate { txr=$1 echo -n "$txr " let count++ ./self-test testdata-ascii.txt $txr -- $rx_rate || let fail++ } # for adj in -8 -5 -3 -2 -1 0 +1 +2 +3 +5 +8 for adj in -8 -1 0 +1 +8 do let tx_rate="rx_rate + adj" try_tx_rx_rate $tx_rate done if [ $fail -eq 0 ] then echo " (all $count rate-slop tests passed)" else echo " ($fail/$count rate-slop tests failed)" fi exit $fail minimodem-0.23/tests/70-callerid-mdmf.test0000775000175000017500000000156712432217625015346 00000000000000#!/bin/bash MINIMODEM="${MINIMODEM-./minimodem}" [ -f "$MINIMODEM" ] || { MINIMODEM="../src/minimodem" [ -f "$MINIMODEM" ] || { echo "E: cannot find minimodem in ./ or ../src/" 1>&2 exit 1 } } bytesfile="testdata-callerid-mdmf.bytes" [ "$1" != "" ] && bytesfile="$1" TMPF="/tmp/minimodem-test-$$" trap "rm -f $TMPF.*" 0 set -e textfile="${bytesfile%%.bytes}.txt" minimodem_tx_args="1200 --ascii" minimodem_rx_args="callerid" $MINIMODEM --tx --file $TMPF.wav $minimodem_tx_args < "$bytesfile" # cp $TMPF.wav /tmp/x.wav $MINIMODEM --rx --file $TMPF.wav $minimodem_rx_args \ > $TMPF.out 2> $TMPF.err || { cat $TMPF.err exit 1 } cmp "$textfile" $TMPF.out { read xlitcarrier read xlitblankline read xlithashes xlitnocarrier stats stats="${stats% ###}" } < $TMPF.err result="OK " exitcode=0 echo -e "$result $stats" exit $exitcode minimodem-0.23/tests/07-self-test-no-lut.test0000775000175000017500000000006112432217625015754 00000000000000exec ./self-test testdata-ascii.txt 1200 --lut=0 minimodem-0.23/tests/14-verify-perfect-lut16-float.test0000775000175000017500000000015312432217625017640 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=16 --float-samples minimodem-0.23/tests/self-test0000775000175000017500000000266512036617132013347 00000000000000#!/bin/bash MINIMODEM="${MINIMODEM-./minimodem}" [ -f "$MINIMODEM" ] || { MINIMODEM="../src/minimodem" [ -f "$MINIMODEM" ] || { echo "E: cannot find minimodem in ./ or ../src/" 1>&2 exit 1 } } test_perfect=0 [ "$1" = "-P" ] && { test_perfect=1 shift } [ $# -ge 2 ] || { echo "usage: self-test [-P] textfile minimodem_tx_args [ -- minimodem_rx_args ]" 1>&2 exit 1 } textfile="$1" shift minimodem_tx_args="$1" shift while [ $# -gt 0 ] do [ "$1" = "--" ] && { shift break } minimodem_tx_args="$minimodem_tx_args $1" shift done if [ $# -gt 0 ] then minimodem_rx_args="$*" else minimodem_rx_args="$minimodem_tx_args" fi TMPF="/tmp/minimodem-test-$$" trap "rm -f $TMPF.*" 0 set -e #echo #echo "$MINIMODEM --tx ... $minimodem_tx_args" #echo "$MINIMODEM --rx ... $minimodem_rx_args" $MINIMODEM --tx --file $TMPF.wav $minimodem_tx_args < "$textfile" # cp $TMPF.wav /tmp/x.wav $MINIMODEM --rx --file $TMPF.wav $minimodem_rx_args \ > $TMPF.out 2> $TMPF.err || { cat $TMPF.err exit 1 } cmp "$textfile" $TMPF.out { read xlitcarrier read xlitblankline read xlithashes xlitnocarrier stats stats="${stats% ###}" } < $TMPF.err result="OK " exitcode=0 [ $test_perfect -eq 1 ] && { match="confidence=inf .* (rate perfect)" if grep -q "$match" $TMPF.err then result="PERFECT" else result="IMPERFECT" exitcode=1 fi } echo -e "$result $stats" exit $exitcode minimodem-0.23/tests/13-verify-perfect-nolut-float.test0000775000175000017500000000015212432217625020024 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=0 --float-samples minimodem-0.23/tests/81-ascii7.test0000775000175000017500000000005412432217625014015 00000000000000exec ./self-test testdata-ascii.txt -7 1200 minimodem-0.23/tests/testdata-multibyte.txt0000664000175000017500000000027312036617132016072 00000000000000Minimodem unterstützt jetzt Deutsch! Beachten sie, dass wörter mit multibyte-zeichen korrekt gedruckt werden. Minimodem ahora soporta Español! Minimodem prend désormais en Français! minimodem-0.23/tests/03-self-test-rtty.test0000775000175000017500000000014212432217625015534 00000000000000# use testdata-ascii-baudot.txt as the sample text file exec ./self-test testdata-baudot.txt rtty minimodem-0.23/tests/40-noise.test0000775000175000017500000000073012432217625013747 00000000000000#!/bin/bash flags="$*" [ -z "$flags" ] && flags="1200" let count=0 let fail=0 function try_tx_rx_noise { a="$1" echo -n "$a " let count++ ./self-test testdata-ascii.txt \ $flags --volume 0.5 \ -- \ $flags --Xrxnoise $noise --rx-one || let fail++ } for noise in 0.00 0.05 0.10 0.50 do try_tx_rx_noise "$noise" done if [ $fail -eq 0 ] then echo " (all $count noise tests passed)" else echo " ($fail/$count noise tests failed)" fi exit $fail minimodem-0.23/tests/80-SAME.test0000775000175000017500000000005112432217625013357 00000000000000exec ./self-test testdata-ascii.txt SAME minimodem-0.23/tests/09-self-test-lut16-float.test0000775000175000017500000000010212432217625016612 00000000000000exec ./self-test testdata-ascii.txt 1200 --lut=16 --float-samples minimodem-0.23/tests/31-amplitude-float.test0000775000175000017500000000005512432217625015721 00000000000000#!/bin/bash exec ./30-amplitude.test --float minimodem-0.23/tests/testdata-callerid-mdmf.bytes0000664000175000017500000000004312036617132017056 00000000000000€ 03240902JOHN DOE 8005551212}minimodem-0.23/tests/30-amplitude.test0000775000175000017500000000064012432217625014615 00000000000000#!/bin/bash flags="1200 $*" let count=0 let fail=0 function try_tx_rx_ampl { a="$1" echo -n "$a " let count++ ./self-test testdata-ascii.txt --volume $a $flags -- $flags || let fail++ } for ampl in 3.50 1.00 0.30 0.01 " E " do try_tx_rx_ampl "$ampl" done if [ $fail -eq 0 ] then echo " (all $count amplitude tests passed)" else echo " ($fail/$count amplitude tests failed)" fi exit $fail minimodem-0.23/Makefile.in0000664000175000017500000005752112661703417012425 00000000000000# Makefile.in generated by automake 1.15 from Makefile.am. # @configure_input@ # Copyright (C) 1994-2014 Free Software Foundation, Inc. # This Makefile.in is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. @SET_MAKE@ VPATH = @srcdir@ am__is_gnu_make = { \ if test -z '$(MAKELEVEL)'; then \ false; \ elif test -n '$(MAKE_HOST)'; then \ true; \ elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \ true; \ else \ false; \ fi; \ } am__make_running_with_option = \ case $${target_option-} in \ ?) ;; \ *) echo "am__make_running_with_option: internal error: invalid" \ "target option '$${target_option-}' specified" >&2; \ exit 1;; \ esac; \ has_opt=no; \ sane_makeflags=$$MAKEFLAGS; \ if $(am__is_gnu_make); then \ sane_makeflags=$$MFLAGS; \ else \ case $$MAKEFLAGS in \ *\\[\ \ ]*) \ bs=\\; \ sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \ | sed "s/$$bs$$bs[$$bs $$bs ]*//g"`;; \ esac; \ fi; \ skip_next=no; \ strip_trailopt () \ { \ flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \ }; \ for flg in $$sane_makeflags; do \ test $$skip_next = yes && { skip_next=no; continue; }; \ case $$flg in \ *=*|--*) continue;; \ -*I) strip_trailopt 'I'; skip_next=yes;; \ -*I?*) strip_trailopt 'I';; \ -*O) strip_trailopt 'O'; skip_next=yes;; \ -*O?*) strip_trailopt 'O';; \ -*l) strip_trailopt 'l'; skip_next=yes;; \ -*l?*) strip_trailopt 'l';; \ -[dEDm]) skip_next=yes;; \ -[JT]) skip_next=yes;; \ esac; \ case $$flg in \ *$$target_option*) has_opt=yes; break;; \ esac; \ done; \ test $$has_opt = yes am__make_dryrun = (target_option=n; $(am__make_running_with_option)) am__make_keepgoing = (target_option=k; $(am__make_running_with_option)) pkgdatadir = $(datadir)/@PACKAGE@ pkgincludedir = $(includedir)/@PACKAGE@ pkglibdir = $(libdir)/@PACKAGE@ pkglibexecdir = $(libexecdir)/@PACKAGE@ am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd install_sh_DATA = $(install_sh) -c -m 644 install_sh_PROGRAM = $(install_sh) -c install_sh_SCRIPT = $(install_sh) -c INSTALL_HEADER = $(INSTALL_DATA) transform = $(program_transform_name) NORMAL_INSTALL = : PRE_INSTALL = : POST_INSTALL = : NORMAL_UNINSTALL = : PRE_UNINSTALL = : POST_UNINSTALL = : subdir = . 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See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # AM_CFLAGS = -Wall # -Werror -Wdouble-promotion AM_CPPFLAGS = $(DEPS_CFLAGS) bin_PROGRAMS = minimodem dist_man_MANS = minimodem.1 EXTRA_DIST = minimodem.1.html SIMPLEAUDIO_SRC = \ simpleaudio.h \ simpleaudio_internal.h \ simpleaudio.c \ simple-tone-generator.c \ simpleaudio-pulse.c \ simpleaudio-alsa.c \ simpleaudio-benchmark.c \ simpleaudio-sndfile.c FSK_SRC = fsk.h fsk.c BAUDOT_SRC = baudot.h baudot.c UIC_SRC = uic_codes.h uic_codes.c DATABITS_SRC = \ databits.h \ databits_ascii.c \ databits_binary.c \ databits_callerid.c \ databits_baudot.c $(BAUDOT_SRC) \ databits_uic.c $(UIC_SRC) minimodem_LDADD = $(DEPS_LIBS) minimodem_SOURCES = minimodem.c $(DATABITS_SRC) $(FSK_SRC) $(SIMPLEAUDIO_SRC) minimodem.1.html: minimodem.1 Makefile man --html=cat ./minimodem.1 | sed '5,$$ s:\(http\:[^ &]*\):\1:g' > $@ [ -s $@ ] || { rm $@; exit 1; } minimodem-0.23/src/minimodem.c0000664000175000017500000012036012661674204013262 00000000000000/* * minimodem.c * * minimodem - software audio Bell-type or RTTY FSK modem * * Copyright (C) 2011-2016 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_CONFIG_H #include "config.h" #else #define VERSION "unknown" #endif #include "simpleaudio.h" #include "fsk.h" #include "databits.h" char *program_name = ""; int tx_transmitting = 0; int tx_leader_bits_len = 2; int tx_trailer_bits_len = 2; simpleaudio *tx_sa_out; float tx_bfsk_mark_f; unsigned int tx_bit_nsamples; void tx_stop_transmit_sighandler( int sig ) { // fprintf(stderr, "alarm\n"); int j; for ( j=0; j 0 ) simpleaudio_tone(sa_out, invert_start_stop ? bfsk_mark_f : bfsk_space_f, bit_nsamples * bfsk_nstartbits); // start for ( i=0; i> (n_data_bits - i - 1) ) & 1; } else { bit = ( bits >> i ) & 1; } float tone_freq = bit == 1 ? bfsk_mark_f : bfsk_space_f; simpleaudio_tone(sa_out, tone_freq, bit_nsamples); } if ( bfsk_nstopbits > 0 ) simpleaudio_tone(sa_out, invert_start_stop ? bfsk_space_f : bfsk_mark_f, bit_nsamples * bfsk_nstopbits); // stop } static void fsk_transmit_stdin( simpleaudio *sa_out, int tx_interactive, float data_rate, float bfsk_mark_f, float bfsk_space_f, int n_data_bits, float bfsk_nstartbits, float bfsk_nstopbits, int invert_start_stop, int bfsk_msb_first, unsigned int bfsk_do_tx_sync_bytes, unsigned int bfsk_sync_byte, databits_encoder encode, int txcarrier ) { size_t sample_rate = simpleaudio_get_rate(sa_out); size_t bit_nsamples = sample_rate / data_rate + 0.5f; tx_sa_out = sa_out; tx_bfsk_mark_f = bfsk_mark_f; tx_bit_nsamples = bit_nsamples; // one-shot struct itimerval itv = { {0, 0}, // it_interval {0, 1000000/(float)(data_rate+data_rate*0.03f)} // it_value }; struct itimerval itv_zero = { {0, 0}, // it_interval {0, 0} // it_value }; int block_input = tx_interactive && !txcarrier; if ( block_input ) signal(SIGALRM, tx_stop_transmit_sighandler); // Set up for select() should we need it int fd = fileno(stdin); fd_set fdset; tx_transmitting = 0; int end_of_file = 0; unsigned char buf; int n_read = 0; int idle = 0; while ( !end_of_file ) { FD_ZERO(&fdset); FD_SET(fd, &fdset); struct timeval tv_zero = { 0, 0 }; if( block_input || select(fd+1, &fdset, NULL, NULL, &tv_zero) ) { n_read = read(fd, &buf, sizeof(buf)); if( n_read <= 0 ) //Includes EOF (0) and errors (-1) { end_of_file = 1; continue; //Do nothing else } idle = 0; } else idle = 1; // Cause any running timer to immediately trigger if ( block_input ) setitimer(ITIMER_REAL, &itv_zero, NULL); if( !idle ) { // fprintf(stderr, "", c); unsigned int nwords; unsigned int bits[2]; unsigned int j; nwords = encode(bits, buf); if ( !tx_transmitting ) { tx_transmitting = 1; /* emit leader tone (mark) */ for ( j=0; j\n" "License GPLv3+: GNU GPL version 3 or later .\n" "This is free software: you are free to change and redistribute it.\n" "There is NO WARRANTY, to the extent permitted by law.\n\n" "Written by Kamal Mostafa .\n", VERSION); } void usage() { fprintf(stderr, "usage: minimodem [--tx|--rx] [options] {baudmode}\n" " -t, --tx, --transmit, --write\n" " -r, --rx, --receive, --read (default)\n" " [options]\n" " -a, --auto-carrier\n" " -i, --inverted\n" " -c, --confidence {min-confidence-threshold}\n" " -l, --limit {max-confidence-search-limit}\n" " -8, --ascii ASCII 8-N-1\n" " -7, ASCII 7-N-1\n" " -5, --baudot Baudot 5-N-1\n" " -f, --file {filename.flac}\n" " -b, --bandwidth {rx_bandwidth}\n" " -v, --volume {amplitude or 'E'}\n" " -M, --mark {mark_freq}\n" " -S, --space {space_freq}\n" " --startbits {n}\n" " --stopbits {n.n}\n" " --invert-start-stop\n" " --sync-byte {0xXX}\n" " -q, --quiet\n" " -R, --samplerate {rate}\n" " -V, --version\n" " -A, --alsa[=plughw:X,Y]\n" " --lut={tx_sin_table_len}\n" " --float-samples\n" " --rx-one\n" " --benchmarks\n" " --binary-output\n" " --binary-raw {nbits}\n" " --print-filter\n" " --tx-carrier\n" " {baudmode}\n" " any_number_N Bell-like N bps --ascii\n" " 1200 Bell202 1200 bps --ascii\n" " 300 Bell103 300 bps --ascii\n" " rtty RTTY 45.45 bps --baudot --stopbits=1.5\n" " tdd TTY/TDD 45.45 bps --baudot --stopbits=2.0\n" " same NOAA SAME 520.83 bps --sync-byte=0xAB ...\n" " callerid Bell202 CID 1200 bps\n" " uic{-train,-ground} UIC-751-3 Train/Ground 600 bps\n" ); exit(1); } int build_expect_bits_string( char *expect_bits_string, int bfsk_nstartbits, int bfsk_n_data_bits, float bfsk_nstopbits, int invert_start_stop, int use_expect_bits, unsigned long long expect_bits ) { // example expect_bits_string // 0123456789A // isddddddddp i == idle bit (a.k.a. prev_stop bit) // s == start bit d == data bits p == stop bit // ebs = "10dddddddd1" <-- expected mark/space framing pattern // // NOTE! expect_n_bits ends up being (frame_n_bits+1), because // we expect the prev_stop bit in addition to this frame's own // (start + n_data_bits + stop) bits. But for each decoded frame, // we will advance just frame_n_bits worth of samples, leaving us // pointing at our stop bit -- it becomes the next frame's prev_stop. // // prev_stop--v // start--v v--stop // char *expect_bits_string = "10dddddddd1"; // char start_bit_value = invert_start_stop ? '1' : '0'; char stop_bit_value = invert_start_stop ? '0' : '1'; int j = 0; if ( bfsk_nstopbits != 0.0f ) expect_bits_string[j++] = stop_bit_value; int i; // Nb. only integer number of start bits works (for rx) for ( i=0; i>i)&1 ) + '0'; else expect_bits_string[j] = 'd'; } if ( bfsk_nstopbits != 0.0f ) expect_bits_string[j++] = stop_bit_value; expect_bits_string[j] = 0; return j; } int main( int argc, char*argv[] ) { char *modem_mode = NULL; int TX_mode = -1; int quiet_mode = 0; int output_print_filter = 0; float band_width = 0; float bfsk_mark_f = 0; float bfsk_space_f = 0; unsigned int bfsk_inverted_freqs = 0; int bfsk_nstartbits = -1; float bfsk_nstopbits = -1; unsigned int bfsk_do_rx_sync = 0; unsigned int bfsk_do_tx_sync_bytes = 0; unsigned long long bfsk_sync_byte = -1; unsigned int bfsk_n_data_bits = 0; int bfsk_msb_first = 0; char *expect_data_string = NULL; char *expect_sync_string = NULL; unsigned int expect_n_bits; int invert_start_stop = 0; int autodetect_shift; char *filename = NULL; float carrier_autodetect_threshold = 0.0; // fsk_confidence_threshold : signal-to-noise squelch control // // The minimum SNR-ish confidence level seen as "a signal". float fsk_confidence_threshold = 1.5; // fsk_confidence_search_limit : performance vs. quality // // If we find a frame with confidence > confidence_search_limit, // quit searching for a better frame. confidence_search_limit has a // dramatic effect on peformance (high value yields low performance, but // higher decode quality, for noisy or hard-to-discern signals (Bell 103, // or skewed rates). float fsk_confidence_search_limit = 2.3f; // float fsk_confidence_search_limit = INFINITY; /* for test */ sa_backend_t sa_backend = SA_BACKEND_SYSDEFAULT; char *sa_backend_device = NULL; sa_format_t sample_format = SA_SAMPLE_FORMAT_S16; unsigned int sample_rate = 48000; unsigned int nchannels = 1; // FIXME: only works with one channel float tx_amplitude = 1.0; unsigned int tx_sin_table_len = 4096; unsigned int rx_one = 0; float rxnoise_factor = 0.0; int txcarrier = 0; int output_mode_binary = 0; int output_mode_raw_nbits = 0; float bfsk_data_rate = 0.0; databits_encoder *bfsk_databits_encode; databits_decoder *bfsk_databits_decode; bfsk_databits_decode = databits_decode_ascii8; bfsk_databits_encode = databits_encode_ascii8; /* validate the default system audio mechanism */ #if !(USE_PULSEAUDIO || USE_ALSA) # define _MINIMODEM_NO_SYSTEM_AUDIO # if !USE_SNDFILE # error At least one of {USE_PULSEAUDIO,USE_ALSA,USE_SNDFILE} must be enabled! # endif #endif program_name = strrchr(argv[0], '/'); if ( program_name ) program_name++; else program_name = argv[0]; int c; int option_index; enum { MINIMODEM_OPT_UNUSED=256, // placeholder MINIMODEM_OPT_MSBFIRST, MINIMODEM_OPT_STARTBITS, MINIMODEM_OPT_STOPBITS, MINIMODEM_OPT_INVERT_START_STOP, MINIMODEM_OPT_SYNC_BYTE, MINIMODEM_OPT_LUT, MINIMODEM_OPT_FLOAT_SAMPLES, MINIMODEM_OPT_RX_ONE, MINIMODEM_OPT_BENCHMARKS, MINIMODEM_OPT_BINARY_OUTPUT, MINIMODEM_OPT_BINARY_RAW, MINIMODEM_OPT_PRINT_FILTER, MINIMODEM_OPT_XRXNOISE, MINIMODEM_OPT_TXCARRIER }; while ( 1 ) { static struct option long_options[] = { { "version", 0, 0, 'V' }, { "tx", 0, 0, 't' }, { "transmit", 0, 0, 't' }, { "write", 0, 0, 't' }, { "rx", 0, 0, 'r' }, { "receive", 0, 0, 'r' }, { "read", 0, 0, 'r' }, { "confidence", 1, 0, 'c' }, { "limit", 1, 0, 'l' }, { "auto-carrier", 0, 0, 'a' }, { "inverted", 0, 0, 'i' }, { "ascii", 0, 0, '8' }, { "", 0, 0, '7' }, { "baudot", 0, 0, '5' }, { "msb-first", 0, 0, MINIMODEM_OPT_MSBFIRST }, { "file", 1, 0, 'f' }, { "bandwidth", 1, 0, 'b' }, { "volume", 1, 0, 'v' }, { "mark", 1, 0, 'M' }, { "space", 1, 0, 'S' }, { "startbits", 1, 0, MINIMODEM_OPT_STARTBITS }, { "stopbits", 1, 0, MINIMODEM_OPT_STOPBITS }, { "invert-start-stop", 0, 0, MINIMODEM_OPT_INVERT_START_STOP }, { "sync-byte", 1, 0, MINIMODEM_OPT_SYNC_BYTE }, { "quiet", 0, 0, 'q' }, { "alsa", 2, 0, 'A' }, { "samplerate", 1, 0, 'R' }, { "lut", 1, 0, MINIMODEM_OPT_LUT }, { "float-samples", 0, 0, MINIMODEM_OPT_FLOAT_SAMPLES }, { "rx-one", 0, 0, MINIMODEM_OPT_RX_ONE }, { "benchmarks", 0, 0, MINIMODEM_OPT_BENCHMARKS }, { "binary-output", 0, 0, MINIMODEM_OPT_BINARY_OUTPUT }, { "binary-raw", 1, 0, MINIMODEM_OPT_BINARY_RAW }, { "print-filter", 0, 0, MINIMODEM_OPT_PRINT_FILTER }, { "Xrxnoise", 1, 0, MINIMODEM_OPT_XRXNOISE }, { "tx-carrier", 0, 0, MINIMODEM_OPT_TXCARRIER }, { 0 } }; c = getopt_long(argc, argv, "Vtrc:l:ai875f:b:v:M:S:T:qA::R:", long_options, &option_index); if ( c == -1 ) break; switch( c ) { case 'V': version(); exit(0); case 't': if ( TX_mode == 0 ) usage(); TX_mode = 1; break; case 'r': if ( TX_mode == 1 ) usage(); TX_mode = 0; break; case 'c': fsk_confidence_threshold = atof(optarg); break; case 'l': fsk_confidence_search_limit = atof(optarg); break; case 'a': carrier_autodetect_threshold = 0.001; break; case 'i': bfsk_inverted_freqs = 1; break; case 'f': filename = optarg; break; case '8': bfsk_n_data_bits = 8; break; case '7': bfsk_n_data_bits = 7; break; case '5': bfsk_n_data_bits = 5; bfsk_databits_decode = databits_decode_baudot; bfsk_databits_encode = databits_encode_baudot; break; case MINIMODEM_OPT_MSBFIRST: bfsk_msb_first = 1; break; case 'b': band_width = atof(optarg); assert( band_width != 0 ); break; case 'v': if ( optarg[0] == 'E' ) tx_amplitude = FLT_EPSILON; else tx_amplitude = atof(optarg); assert( tx_amplitude > 0.0f ); break; case 'M': bfsk_mark_f = atof(optarg); assert( bfsk_mark_f > 0 ); break; case 'S': bfsk_space_f = atof(optarg); assert( bfsk_space_f > 0 ); break; case MINIMODEM_OPT_STARTBITS: bfsk_nstartbits = atoi(optarg); // Note: bfsk_nstartbits is limited by arrays // expect_bits_string[32] and fsk.c:bit_something[32] assert( bfsk_nstartbits >= 0 && bfsk_nstartbits <= 20 ); break; case MINIMODEM_OPT_STOPBITS: bfsk_nstopbits = atof(optarg); assert( bfsk_nstopbits >= 0 ); break; case MINIMODEM_OPT_INVERT_START_STOP: invert_start_stop = 1; break; case MINIMODEM_OPT_SYNC_BYTE: bfsk_do_rx_sync = 1; bfsk_do_tx_sync_bytes = 16; bfsk_sync_byte = strtol(optarg, NULL, 0); break; case 'q': quiet_mode = 1; break; case 'R': sample_rate = atoi(optarg); assert( sample_rate > 0 ); break; case 'A': #if USE_ALSA sa_backend = SA_BACKEND_ALSA; if ( optarg ) sa_backend_device = optarg; #else fprintf(stderr, "E: This build of minimodem was configured without alsa support.\n"); exit(1); #endif break; case MINIMODEM_OPT_LUT: tx_sin_table_len = atoi(optarg); break; case MINIMODEM_OPT_FLOAT_SAMPLES: sample_format = SA_SAMPLE_FORMAT_FLOAT; break; case MINIMODEM_OPT_RX_ONE: rx_one = 1; break; case MINIMODEM_OPT_BENCHMARKS: benchmarks(); exit(0); break; case MINIMODEM_OPT_BINARY_OUTPUT: output_mode_binary = 1; break; case MINIMODEM_OPT_BINARY_RAW: output_mode_raw_nbits = atoi(optarg); break; case MINIMODEM_OPT_PRINT_FILTER: output_print_filter = 1; break; case MINIMODEM_OPT_XRXNOISE: rxnoise_factor = atof(optarg); break; case MINIMODEM_OPT_TXCARRIER: txcarrier = 1; break; default: usage(); } } if ( TX_mode == -1 ) TX_mode = 0; /* The receive code requires floating point samples to feed to the FFT */ if ( TX_mode == 0 ) sample_format = SA_SAMPLE_FORMAT_FLOAT; if ( filename ) { #if !USE_SNDFILE fprintf(stderr, "E: This build of minimodem was configured without sndfile,\nE: so the --file flag is not supported.\n"); exit(1); #endif } else { #ifdef _MINIMODEM_NO_SYSTEM_AUDIO fprintf(stderr, "E: this build of minimodem was configured without system audio support,\nE: so only the --file mode is supported.\n"); exit(1); #endif } #if 0 if (optind < argc) { printf("non-option ARGV-elements: "); while (optind < argc) printf("%s ", argv[optind++]); printf("\n"); } #endif if (optind + 1 != argc) { fprintf(stderr, "E: *** Must specify {baudmode} (try \"300\") ***\n"); usage(); } modem_mode = argv[optind++]; if ( strncasecmp(modem_mode, "rtty",5)==0 ) { bfsk_databits_decode = databits_decode_baudot; bfsk_databits_encode = databits_encode_baudot; bfsk_data_rate = 45.45; if ( bfsk_n_data_bits == 0 ) bfsk_n_data_bits = 5; if ( bfsk_nstopbits < 0 ) bfsk_nstopbits = 1.5; } else if ( strncasecmp(modem_mode, "tdd",3)==0 ) { bfsk_databits_decode = databits_decode_baudot; bfsk_databits_encode = databits_encode_baudot; bfsk_data_rate = 45.45; if ( bfsk_n_data_bits == 0 ) bfsk_n_data_bits = 5; if ( bfsk_nstopbits < 0 ) bfsk_nstopbits = 2.0; bfsk_mark_f = 1400; bfsk_space_f = 1800; } else if ( strncasecmp(modem_mode, "same",5)==0 ) { // http://www.nws.noaa.gov/nwr/nwrsame.htm bfsk_data_rate = 520.0 + 5/6.0; bfsk_n_data_bits = 8; bfsk_nstartbits = 0; bfsk_nstopbits = 0; bfsk_do_rx_sync = 1; bfsk_do_tx_sync_bytes = 16; bfsk_sync_byte = 0xAB; bfsk_mark_f = 2083.0 + 1/3.0; bfsk_space_f = 1562.5; band_width = bfsk_data_rate; } else if ( strncasecmp(modem_mode, "caller",6)==0 ) { if ( TX_mode ) { fprintf(stderr, "E: callerid --tx mode is not supported.\n"); return 1; } if ( carrier_autodetect_threshold > 0.0f ) fprintf(stderr, "W: callerid with --auto-carrier is not recommended.\n"); bfsk_databits_decode = databits_decode_callerid; bfsk_data_rate = 1200; bfsk_n_data_bits = 8; } else if ( strncasecmp(modem_mode, "uic", 3) == 0 ) { if ( TX_mode ) { fprintf(stderr, "E: uic-751-3 --tx mode is not supported.\n"); return 1; } // http://ec.europa.eu/transport/rail/interoperability/doc/ccs-tsi-en-annex.pdf if (tolower(modem_mode[4]) == 't') bfsk_databits_decode = databits_decode_uic_train; else bfsk_databits_decode = databits_decode_uic_ground; bfsk_data_rate = 600; bfsk_n_data_bits = 39; bfsk_mark_f = 1300; bfsk_space_f = 1700; bfsk_nstartbits = 8; bfsk_nstopbits = 0; expect_data_string = "11110010ddddddddddddddddddddddddddddddddddddddd"; expect_n_bits = 47; } else { bfsk_data_rate = atof(modem_mode); if ( bfsk_n_data_bits == 0 ) bfsk_n_data_bits = 8; } if ( bfsk_data_rate == 0.0f ) usage(); if ( output_mode_binary || output_mode_raw_nbits ) bfsk_databits_decode = databits_decode_binary; if ( output_mode_raw_nbits ) { bfsk_nstartbits = 0; bfsk_nstopbits = 0; bfsk_n_data_bits = output_mode_raw_nbits; } if ( bfsk_data_rate >= 400 ) { /* * Bell 202: baud=1200 mark=1200 space=2200 */ autodetect_shift = - ( bfsk_data_rate * 5 / 6 ); if ( bfsk_mark_f == 0 ) bfsk_mark_f = bfsk_data_rate / 2 + 600; if ( bfsk_space_f == 0 ) bfsk_space_f = bfsk_mark_f - autodetect_shift; if ( band_width == 0 ) band_width = 200; } else if ( bfsk_data_rate >= 100 ) { /* * Bell 103: baud=300 mark=1270 space=1070 * ITU-T V.21: baud=300 mark=1280 space=1080 */ autodetect_shift = 200; if ( bfsk_mark_f == 0 ) bfsk_mark_f = 1270; if ( bfsk_space_f == 0 ) bfsk_space_f = bfsk_mark_f - autodetect_shift; if ( band_width == 0 ) band_width = 50; // close enough } else { /* * RTTY: baud=45.45 mark/space=variable shift=-170 */ autodetect_shift = 170; if ( bfsk_mark_f == 0 ) bfsk_mark_f = 1585; if ( bfsk_space_f == 0 ) bfsk_space_f = bfsk_mark_f - autodetect_shift; if ( band_width == 0 ) { band_width = 10; // FIXME chosen arbitrarily } } // defaults: 1 start bit, 1 stop bit if ( bfsk_nstartbits < 0 ) bfsk_nstartbits = 1; if ( bfsk_nstopbits < 0 ) bfsk_nstopbits = 1.0; // do not transmit any leader tone if no start bits if ( bfsk_nstartbits == 0 ) tx_leader_bits_len = 0; if ( bfsk_inverted_freqs ) { float t = bfsk_mark_f; bfsk_mark_f = bfsk_space_f; bfsk_space_f = t; } /* restrict band_width to <= data rate (FIXME?) */ if ( band_width > bfsk_data_rate ) band_width = bfsk_data_rate; // sanitize confidence search limit if ( fsk_confidence_search_limit < fsk_confidence_threshold ) fsk_confidence_search_limit = fsk_confidence_threshold; char *stream_name = NULL; if ( filename ) { sa_backend = SA_BACKEND_FILE; stream_name = filename; } /* * Handle transmit mode */ if ( TX_mode ) { simpleaudio_tone_init(tx_sin_table_len, tx_amplitude); int tx_interactive = 0; if ( ! stream_name ) { tx_interactive = 1; stream_name = "output audio"; } simpleaudio *sa_out; sa_out = simpleaudio_open_stream(sa_backend, sa_backend_device, SA_STREAM_PLAYBACK, sample_format, sample_rate, nchannels, program_name, stream_name); if ( ! sa_out ) return 1; fsk_transmit_stdin(sa_out, tx_interactive, bfsk_data_rate, bfsk_mark_f, bfsk_space_f, bfsk_n_data_bits, bfsk_nstartbits, bfsk_nstopbits, invert_start_stop, bfsk_msb_first, bfsk_do_tx_sync_bytes, bfsk_sync_byte, bfsk_databits_encode, txcarrier ); simpleaudio_close(sa_out); return 0; } /* * Open the input audio stream */ if ( ! stream_name ) stream_name = "input audio"; simpleaudio *sa; sa = simpleaudio_open_stream(sa_backend, sa_backend_device, SA_STREAM_RECORD, sample_format, sample_rate, nchannels, program_name, stream_name); if ( ! sa ) return 1; sample_rate = simpleaudio_get_rate(sa); if ( rxnoise_factor != 0.0f ) simpleaudio_set_rxnoise(sa, rxnoise_factor); /* * Prepare the input sample chunk rate */ float nsamples_per_bit = sample_rate / bfsk_data_rate; /* * Prepare the fsk plan */ fsk_plan *fskp; fskp = fsk_plan_new(sample_rate, bfsk_mark_f, bfsk_space_f, band_width); if ( !fskp ) { fprintf(stderr, "fsk_plan_new() failed\n"); return 1; } /* * Prepare the input sample buffer. For 8-bit frames with prev/start/stop * we need 11 data-bits worth of samples, and we will scan through one bits * worth at a time, hence we need a minimum total input buffer size of 12 * data-bits. */ unsigned int nbits = 0; nbits += 1; // prev stop bit (last whole stop bit) nbits += bfsk_nstartbits; // start bits nbits += bfsk_n_data_bits; nbits += 1; // stop bit (first whole stop bit) // FIXME EXPLAIN +1 goes with extra bit when scanning size_t samplebuf_size = ceilf(nsamples_per_bit) * (nbits+1); samplebuf_size *= 2; // account for the half-buf filling method #define SAMPLE_BUF_DIVISOR 12 #ifdef SAMPLE_BUF_DIVISOR // For performance, use a larger samplebuf_size than necessary if ( samplebuf_size < sample_rate / SAMPLE_BUF_DIVISOR ) samplebuf_size = sample_rate / SAMPLE_BUF_DIVISOR; #endif float *samplebuf = malloc(samplebuf_size * sizeof(float)); size_t samples_nvalid = 0; debug_log("samplebuf_size=%zu\n", samplebuf_size); /* * Run the main loop */ int ret = 0; int carrier = 0; float confidence_total = 0; float amplitude_total = 0; unsigned int nframes_decoded = 0; size_t carrier_nsamples = 0; unsigned int noconfidence = 0; unsigned int advance = 0; // Fraction of nsamples_per_bit that we will "overscan"; range (0.0 .. 1.0) float fsk_frame_overscan = 0.5; // should be != 0.0 (only the nyquist edge cases actually require this?) // for handling of slightly faster-than-us rates: // should be >> 0.0 to allow us to lag back for faster-than-us rates // should be << 1.0 or we may lag backwards over whole bits // for optimal analysis: // should be >= 0.5 (half a bit width) or we may not find the optimal bit // should be < 1.0 (a full bit width) or we may skip over whole bits // for encodings without start/stop bits: // MUST be <= 0.5 or we may accidentally skip a bit // assert( fsk_frame_overscan >= 0.0f && fsk_frame_overscan < 1.0f ); // ensure that we overscan at least a single sample unsigned int nsamples_overscan = nsamples_per_bit * fsk_frame_overscan + 0.5f; if ( fsk_frame_overscan > 0.0f && nsamples_overscan == 0 ) nsamples_overscan = 1; debug_log("fsk_frame_overscan=%f nsamples_overscan=%u\n", fsk_frame_overscan, nsamples_overscan); // n databits plus bfsk_startbit start bits plus bfsk_nstopbit stop bits: float frame_n_bits = bfsk_n_data_bits + bfsk_nstartbits + bfsk_nstopbits; unsigned int frame_nsamples = nsamples_per_bit * frame_n_bits + 0.5f; char expect_data_string_buffer[64]; if (expect_data_string == NULL) { expect_data_string = expect_data_string_buffer; expect_n_bits = build_expect_bits_string(expect_data_string, bfsk_nstartbits, bfsk_n_data_bits, bfsk_nstopbits, invert_start_stop, 0, 0); } debug_log("eds = '%s' (%lu)\n", expect_data_string, strlen(expect_data_string)); char expect_sync_string_buffer[64]; if (expect_sync_string == NULL && bfsk_do_rx_sync && (long long) bfsk_sync_byte >= 0) { expect_sync_string = expect_sync_string_buffer; build_expect_bits_string(expect_sync_string, bfsk_nstartbits, bfsk_n_data_bits, bfsk_nstopbits, invert_start_stop, 1, bfsk_sync_byte); } else { expect_sync_string = expect_data_string; } debug_log("ess = '%s' (%lu)\n", expect_sync_string, strlen(expect_sync_string)); unsigned int expect_nsamples = nsamples_per_bit * expect_n_bits; float track_amplitude = 0.0; float peak_confidence = 0.0; signal(SIGINT, rx_stop_sighandler); while ( 1 ) { if ( rx_stop ) break; debug_log("advance=%u\n", advance); /* Shift the samples in samplebuf by 'advance' samples */ assert( advance <= samplebuf_size ); if ( advance == samplebuf_size ) { samples_nvalid = 0; advance = 0; } if ( advance ) { if ( advance > samples_nvalid ) break; memmove(samplebuf, samplebuf+advance, (samplebuf_size-advance)*sizeof(float)); samples_nvalid -= advance; } if ( samples_nvalid < samplebuf_size/2 ) { float *samples_readptr = samplebuf + samples_nvalid; size_t read_nsamples = samplebuf_size/2; /* Read more samples into samplebuf (fill it) */ assert ( read_nsamples > 0 ); assert ( samples_nvalid + read_nsamples <= samplebuf_size ); ssize_t r; r = simpleaudio_read(sa, samples_readptr, read_nsamples); debug_log("simpleaudio_read(samplebuf+%zd, n=%zu) returns %zd\n", samples_readptr - samplebuf, read_nsamples, r); if ( r < 0 ) { fprintf(stderr, "simpleaudio_read: error\n"); ret = -1; break; } samples_nvalid += r; } if ( samples_nvalid == 0 ) break; /* Auto-detect carrier frequency */ static int carrier_band = -1; if ( carrier_autodetect_threshold > 0.0f && carrier_band < 0 ) { unsigned int i; float nsamples_per_scan = nsamples_per_bit; if ( nsamples_per_scan > fskp->fftsize ) nsamples_per_scan = fskp->fftsize; for ( i=0; i+nsamples_per_scan<=samples_nvalid; i+=nsamples_per_scan ) { carrier_band = fsk_detect_carrier(fskp, samplebuf+i, nsamples_per_scan, carrier_autodetect_threshold); if ( carrier_band >= 0 ) break; } advance = i + nsamples_per_scan; if ( advance > samples_nvalid ) advance = samples_nvalid; if ( carrier_band < 0 ) { debug_log("autodetected carrier band not found\n"); continue; } // default negative shift -- reasonable? int b_shift = - (float)(autodetect_shift + fskp->band_width/2.0f) / fskp->band_width; if ( bfsk_inverted_freqs ) b_shift *= -1; /* only accept a carrier as b_mark if it will not result * in a b_space band which is "too low". */ int b_space = carrier_band + b_shift; if ( b_space < 1 || b_space >= fskp->nbands ) { debug_log("autodetected space band out of range\n" ); carrier_band = -1; continue; } debug_log("### TONE freq=%.1f ###\n", carrier_band * fskp->band_width); fsk_set_tones_by_bandshift(fskp, /*b_mark*/carrier_band, b_shift); } /* * The main processing algorithm: scan samplesbuf for FSK frames, * looking at an entire frame at once. */ debug_log( "--------------------------\n"); if ( samples_nvalid < expect_nsamples ) break; // try_max_nsamples // serves two purposes // 1. avoids finding a non-optimal first frame // 2. allows us to track slightly slow signals unsigned int try_max_nsamples; if ( carrier ) try_max_nsamples = nsamples_per_bit * 0.75f + 0.5f; else try_max_nsamples = nsamples_per_bit; try_max_nsamples += nsamples_overscan; // FSK_ANALYZE_NSTEPS Try 3 frame positions across the try_max_nsamples // range. Using a larger nsteps allows for more accurate tracking of // fast/slow signals (at decreased performance). Note also // FSK_ANALYZE_NSTEPS_FINE below, which refines the frame // position upon first acquiring carrier, or if confidence falls. #define FSK_ANALYZE_NSTEPS 3 unsigned int try_step_nsamples = try_max_nsamples / FSK_ANALYZE_NSTEPS; if ( try_step_nsamples == 0 ) try_step_nsamples = 1; float confidence, amplitude; unsigned long long bits = 0; /* Note: frame_start_sample is actually the sample where the * prev_stop bit begins (since the "frame" includes the prev_stop). */ unsigned int frame_start_sample = 0; unsigned int try_first_sample; float try_confidence_search_limit; try_confidence_search_limit = fsk_confidence_search_limit; try_first_sample = carrier ? nsamples_overscan : 0; confidence = fsk_find_frame(fskp, samplebuf, expect_nsamples, try_first_sample, try_max_nsamples, try_step_nsamples, try_confidence_search_limit, carrier ? expect_data_string : expect_sync_string, &bits, &litude, &frame_start_sample ); int do_refine_frame = 0; if ( confidence < peak_confidence * 0.75f ) { do_refine_frame = 1; debug_log(" ... do_refine_frame rescan (confidence %.3f << %.3f peak)\n", confidence, peak_confidence); peak_confidence = 0; } // no-confidence if amplitude drops abruptly to < 25% of the // track_amplitude, which follows amplitude with hysteresis if ( amplitude < track_amplitude * 0.25f ) { confidence = 0; } #define FSK_MAX_NOCONFIDENCE_BITS 20 if ( confidence <= fsk_confidence_threshold ) { // FIXME: explain if ( ++noconfidence > FSK_MAX_NOCONFIDENCE_BITS ) { carrier_band = -1; if ( carrier ) { if ( !quiet_mode ) report_no_carrier(fskp, sample_rate, bfsk_data_rate, frame_n_bits, nframes_decoded, carrier_nsamples, confidence_total, amplitude_total); carrier = 0; carrier_nsamples = 0; confidence_total = 0; amplitude_total = 0; nframes_decoded = 0; track_amplitude = 0.0; if ( rx_one ) break; } } /* Advance the sample stream forward by try_max_nsamples so the * next time around the loop we continue searching from where * we left off this time. */ advance = try_max_nsamples; debug_log("@ NOCONFIDENCE=%u advance=%u\n", noconfidence, advance); continue; } // Add a frame's worth of samples to the sample count carrier_nsamples += frame_nsamples; if ( carrier ) { // If we already had carrier, adjust sample count +start -overscan carrier_nsamples += frame_start_sample; carrier_nsamples -= nsamples_overscan; } else { // We just acquired carrier. if ( !quiet_mode ) { if ( bfsk_data_rate >= 100 ) fprintf(stderr, "### CARRIER %u @ %.1f Hz ", (unsigned int)(bfsk_data_rate + 0.5f), (double)(fskp->b_mark * fskp->band_width)); else fprintf(stderr, "### CARRIER %.2f @ %.1f Hz ", (double)(bfsk_data_rate), (double)(fskp->b_mark * fskp->band_width)); } if ( !quiet_mode ) fprintf(stderr, "###\n"); carrier = 1; bfsk_databits_decode(0, 0, 0, 0); // reset the frame processor do_refine_frame = 1; debug_log(" ... do_refine_frame rescan (acquired carrier)\n"); } if ( do_refine_frame ) { if ( confidence < INFINITY && try_step_nsamples > 1 ) { // FSK_ANALYZE_NSTEPS_FINE: // Scan again, but try harder to find the best frame. // Since we found a valid confidence frame in the "sloppy" // fsk_find_frame() call already, we're sure to find one at // least as good this time. #define FSK_ANALYZE_NSTEPS_FINE 8 try_step_nsamples = try_max_nsamples / FSK_ANALYZE_NSTEPS_FINE; if ( try_step_nsamples == 0 ) try_step_nsamples = 1; try_confidence_search_limit = INFINITY; float confidence2, amplitude2; unsigned long long bits2; unsigned int frame_start_sample2; confidence2 = fsk_find_frame(fskp, samplebuf, expect_nsamples, try_first_sample, try_max_nsamples, try_step_nsamples, try_confidence_search_limit, carrier ? expect_data_string : expect_sync_string, &bits2, &litude2, &frame_start_sample2 ); if ( confidence2 > confidence ) { bits = bits2; amplitude = amplitude2; frame_start_sample = frame_start_sample2; } } } track_amplitude = ( track_amplitude + amplitude ) / 2; if ( peak_confidence < confidence ) peak_confidence = confidence; debug_log("@ confidence=%.3f peak_conf=%.3f amplitude=%.3f track_amplitude=%.3f\n", confidence, peak_confidence, amplitude, track_amplitude ); confidence_total += confidence; amplitude_total += amplitude; nframes_decoded++; noconfidence = 0; // Advance the sample stream forward past the junk before the // frame starts (frame_start_sample), and then past decoded frame // (see also NOTE about frame_n_bits and expect_n_bits)... // But actually advance just a bit less than that to allow // for tracking slightly fast signals, hence - nsamples_overscan. advance = frame_start_sample + frame_nsamples - nsamples_overscan; debug_log("@ nsamples_per_bit=%.3f n_data_bits=%u " " frame_start=%u advance=%u\n", nsamples_per_bit, bfsk_n_data_bits, frame_start_sample, advance); // chop off the prev_stop bit if ( bfsk_nstopbits != 0.0f ) bits = bits >> 1; /* * Send the raw data frame bits to the backend frame processor * for final conversion to output data bytes. */ // chop off framing bits bits = bit_window(bits, bfsk_nstartbits, bfsk_n_data_bits); if (bfsk_msb_first) { bits = bit_reverse(bits, bfsk_n_data_bits); } debug_log("Input: %08x%08x - Databits: %i - Shift: %i\n", (unsigned int)(bits >> 32), (unsigned int)bits, bfsk_n_data_bits, bfsk_nstartbits); unsigned int dataout_size = 4096; char dataoutbuf[4096]; unsigned int dataout_nbytes = 0; // suppress printing of bfsk_sync_byte bytes if ( bfsk_do_rx_sync ) { if ( dataout_nbytes == 0 && bits == bfsk_sync_byte ) continue; } dataout_nbytes += bfsk_databits_decode(dataoutbuf + dataout_nbytes, dataout_size - dataout_nbytes, bits, (int)bfsk_n_data_bits); if ( dataout_nbytes == 0 ) continue; /* * Print the output buffer to stdout */ if ( output_print_filter == 0 ) { if ( write(1, dataoutbuf, dataout_nbytes) < 0 ) perror("write"); } else { char *p = dataoutbuf; for ( ; dataout_nbytes; p++,dataout_nbytes-- ) { char printable_char = isprint(*p)||isspace(*p) ? *p : '.'; if ( write(1, &printable_char, 1) < 0 ) perror("write"); } } } /* end of the main loop */ free(samplebuf); signal(SIGINT, SIG_DFL); if ( carrier ) { if ( !quiet_mode ) report_no_carrier(fskp, sample_rate, bfsk_data_rate, frame_n_bits, nframes_decoded, carrier_nsamples, confidence_total, amplitude_total); } simpleaudio_close(sa); fsk_plan_destroy(fskp); return ret; } minimodem-0.23/src/simpleaudio-alsa.c0000664000175000017500000001160112516032512014517 00000000000000/* * simpleaudio-alsa.c * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #if USE_ALSA #include #include #include #include #include "simpleaudio.h" #include "simpleaudio_internal.h" /* * ALSA backend for simpleaudio */ static ssize_t sa_alsa_read( simpleaudio *sa, void *buf, size_t nframes ) { ssize_t frames_read = 0; snd_pcm_t *pcm = (snd_pcm_t *)sa->backend_handle; while ( frames_read < nframes ) { ssize_t r; void * data = buf+frames_read*sa->backend_framesize; ssize_t count = nframes-frames_read; r = snd_pcm_readi(pcm, data, count); if ( r >= 0 ) { frames_read += r; if ( r != count ) fprintf(stderr, "#short+%zd#\n", r); continue; } if (r == -EPIPE) { // Underrun fprintf(stderr, "#"); snd_pcm_prepare(pcm); } else { fprintf(stderr, "snd_pcm_readi: %s\n", snd_strerror(r)); if (r == -EAGAIN || r== -ESTRPIPE) snd_pcm_wait(pcm, 1000); else return r; } } // fprintf(stderr,("[%zd]\n"), frames_read); return frames_read; } static ssize_t sa_alsa_write( simpleaudio *sa, void *buf, size_t nframes ) { ssize_t frames_written = 0; snd_pcm_t *pcm = (snd_pcm_t *)sa->backend_handle; while ( frames_written < nframes ) { ssize_t r; r = snd_pcm_writei(pcm, buf+frames_written*sa->backend_framesize, nframes-frames_written); if (r < 0) { /* recover from e.g. underruns, and try once more */ snd_pcm_recover(pcm, r, 0 /*silent*/); r = snd_pcm_writei(pcm, buf+frames_written*sa->backend_framesize, nframes-frames_written); } if (r < 0) { fprintf(stderr, "E: %s\n", snd_strerror(frames_written)); return -1; } frames_written += r; } assert (frames_written == nframes); return frames_written; } static void sa_alsa_close( simpleaudio *sa ) { snd_pcm_drain(sa->backend_handle); snd_pcm_close(sa->backend_handle); } static int sa_alsa_open_stream( simpleaudio *sa, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ) { snd_pcm_t *pcm; int error; char *be_device; if ( ! backend_device ) { be_device = "default"; } else { be_device = alloca(32); if ( strchr(backend_device, ':') ) snprintf(be_device, 32, "%s", backend_device); else if ( strchr(backend_device, ',') ) snprintf(be_device, 32, "plughw:%s", backend_device); else snprintf(be_device, 32, "plughw:%s,0", backend_device); } error = snd_pcm_open(&pcm, be_device, sa_stream_direction == SA_STREAM_RECORD ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK, 0 /*mode*/); if (error) { fprintf(stderr, "E: Cannot create ALSA stream: %s\n", snd_strerror(error)); return 0; } snd_pcm_format_t pcm_format; switch ( sa->format ) { case SA_SAMPLE_FORMAT_FLOAT: pcm_format = SND_PCM_FORMAT_FLOAT; break; case SA_SAMPLE_FORMAT_S16: pcm_format = SND_PCM_FORMAT_S16; break; default: assert(0); } /* set up ALSA hardware params */ error = snd_pcm_set_params(pcm, pcm_format, SND_PCM_ACCESS_RW_INTERLEAVED, channels, rate, 1 /* soft_resample (allow) */, 100000 /* latency (us) */); if (error) { fprintf(stderr, "E: %s\n", snd_strerror(error)); snd_pcm_close(pcm); return 0; } #if 0 snd_pcm_sw_params_t *swparams; snd_pcm_sw_params_alloca(&swparams); error = snd_pcm_sw_params_current(pcm, swparams); if (error) { fprintf(stderr, "E: %s\n", snd_strerror(error)); snd_pcm_close(pcm); return NULL; } snd_pcm_sw_params_set_start_threshold(pcm, swparams, NFRAMES_VAL); snd_pcm_sw_params_set_stop_threshold(pcm, swparams, NFRAMES_VAL); snd_pcm_sw_params_set_silence_threshold(pcm, swparams, NFRAMES_VAL); error = snd_pcm_sw_params(pcm, swparams); if (error) { fprintf(stderr, "E: %s\n", snd_strerror(error)); snd_pcm_close(pcm); return NULL; } #endif sa->backend_handle = pcm; sa->backend_framesize = sa->channels * sa->samplesize; return 1; } const struct simpleaudio_backend simpleaudio_backend_alsa = { sa_alsa_open_stream, sa_alsa_read, sa_alsa_write, sa_alsa_close, }; #endif /* USE_ALSA */ minimodem-0.23/src/databits.h0000664000175000017500000000511012433467730013100 00000000000000/* * databits.h * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ // Reverses the ordering of the bits on an integer static inline unsigned long long bit_reverse(unsigned long long value, unsigned int bits) { unsigned int out = 0; while (bits--) { out = (out << 1) | (value & 1); value >>= 1; } return out; } // Gets "bits" bits from "value" starting "offset" bits from the start static inline unsigned long long bit_window(unsigned long long value, unsigned int offset, unsigned int bits) { unsigned long long mask = (1ULL << bits) - 1; value = (value >> offset) & mask; return value; } typedef int (databits_encoder)( unsigned int *databits_outp, char char_out ); typedef unsigned int (databits_decoder)( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); int databits_encode_ascii8( unsigned int *databits_outp, char char_out ); unsigned int databits_decode_ascii8( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); #include "baudot.h" #define databits_encode_baudot baudot_encode // from baudot.h //int //databits_encode_baudot( unsigned int *databits_outp, char char_out ); unsigned int databits_decode_baudot( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); int databits_encode_binary( unsigned int *databits_outp, char char_out ); unsigned int databits_decode_binary( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); unsigned int databits_decode_callerid( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); unsigned int databits_decode_uic_ground( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); unsigned int databits_decode_uic_train( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ); minimodem-0.23/src/fsk.h0000664000175000017500000000404512647744475012111 00000000000000/* * fsk.h * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #define USE_FFT // leave this enabled; its presently the only choice #ifdef USE_FFT #include #endif typedef struct fsk_plan fsk_plan; struct fsk_plan { float sample_rate; float f_mark; float f_space; float filter_bw; #ifdef USE_FFT int fftsize; unsigned int nbands; float band_width; unsigned int b_mark; unsigned int b_space; fftwf_plan fftplan; float *fftin; fftwf_complex *fftout; #endif }; fsk_plan * fsk_plan_new( float sample_rate, float f_mark, float f_space, float filter_bw ); void fsk_plan_destroy( fsk_plan *fskp ); /* returns confidence value [0.0 to 1.0] */ float fsk_find_frame( fsk_plan *fskp, float *samples, unsigned int frame_nsamples, unsigned int try_first_sample, unsigned int try_max_nsamples, unsigned int try_step_nsamples, float try_confidence_search_limit, const char *expect_bits_string, unsigned long long *bits_outp, float *ampl_outp, unsigned int *frame_start_outp ); int fsk_detect_carrier(fsk_plan *fskp, float *samples, unsigned int nsamples, float min_mag_threshold ); void fsk_set_tones_by_bandshift( fsk_plan *fskp, unsigned int b_mark, int b_shift ); // FIXME move this?: // #define FSK_DEBUG #ifdef FSK_DEBUG # define debug_log(format, args...) fprintf(stderr, format, ## args) #else # define debug_log(format, args...) #endif minimodem-0.23/src/baudot.c0000664000175000017500000002003612036617132012552 00000000000000/* * baudot.c * * Copyright (C) 2011 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include //#define BAUDOT_DEBUG #ifdef BAUDOT_DEBUG # define debug_log(format, args...) fprintf(stderr, format, ## args) #else # define debug_log(format, args...) #endif static char baudot_decode_table[32][3] = { // letter, U.S. figs, CCITT No.2 figs (Europe) { '_', '^', '^' }, // NUL (underscore and caret marks for debugging) { 'E', '3', '3' }, { 0xA, 0xA, 0xA }, // LF { 'A', '-', '-' }, { ' ', ' ', ' ' }, // SPACE { 'S', 0x7, '\'' }, // BELL or apostrophe { 'I', '8', '8' }, { 'U', '7', '7' }, { 0xD, 0xD, 0xD }, // CR { 'D', '$', '^' }, // '$' or ENQ { 'R', '4', '4' }, { 'J', '\'', 0x7 }, // apostrophe or BELL { 'N', ',', ',' }, { 'F', '!', '!' }, { 'C', ':', ':' }, { 'K', '(', '(' }, { 'T', '5', '5' }, { 'Z', '"', '+' }, { 'L', ')', ')' }, { 'W', '2', '2' }, { 'H', '#', '%' }, // '#' or British pounds symbol // FIXME { 'Y', '6', '6' }, { 'P', '0', '0' }, { 'Q', '1', '1' }, { 'O', '9', '9' }, { 'B', '?', '?' }, { 'G', '&', '&' }, { '%', '%', '%' }, // FIGS (symbol % for debug; won't be printed) { 'M', '.', '.' }, { 'X', '/', '/' }, { 'V', ';', '=' }, { '%', '%', '%' }, // LTRS (symbol % for debug; won't be printed) }; static char baudot_encode_table[0x60][2] = { // index: ascii char; values: bits, ltrs_or_figs_or_neither_or_both /* 0x00 */ /* NUL */ { 0x00, 3 }, // NUL /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* BEL */ { 0x05, 2 }, // BELL (or CCITT2 apostrophe) /* BS */ { 0, 0 }, // non-encodable (FIXME???) /* xxx */ { 0, 0 }, // non-encodable /* LF */ { 0x02, 3 }, // LF /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* 0xD */ { 0x08, 3 }, // CR /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* 0x10 */ /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* xxx */ { 0, 0 }, // non-encodable /* 0x20 */ /* */ { 0x04, 3 }, // SPACE /* ! */ { 0x0d, 2 }, // /* " */ { 0x11, 2 }, // /* # */ { 0x14, 2 }, // '#' (or CCITT2 British pounds symbol) /* $ */ { 0x09, 2 }, // '$' (or CCITT2 ENQ) /* % */ { 0, 0 }, // non-encodable /* & */ { 0x1a, 2 }, // /* ' */ { 0x0b, 2 }, // apostrophe (or CCITT2 BELL) /* ( */ { 0x0f, 2 }, // /* ) */ { 0x12, 2 }, // /* * */ { 0, 0 }, // non-encodable /* + */ { 0x12, 2 }, // /* , */ { 0x0c, 2 }, // /* - */ { 0x03, 2 }, // /* . */ { 0x1c, 2 }, // /* / */ { 0x1d, 2 }, // /* 0x30 */ /* 0 */ { 0x16, 2 }, // /* 1 */ { 0x17, 2 }, // /* 2 */ { 0x13, 2 }, // /* 3 */ { 0x01, 2 }, // /* 4 */ { 0x0a, 2 }, // /* 5 */ { 0x10, 2 }, // /* 6 */ { 0x15, 2 }, // /* 7 */ { 0x07, 2 }, // /* 8 */ { 0x06, 2 }, // /* 9 */ { 0x18, 2 }, // /* : */ { 0x0e, 2 }, // /* ; */ { 0x1e, 2 }, // /* < */ { 0, 0 }, // non-encodable /* = */ { 0, 0 }, // non-encodable /* > */ { 0, 0 }, // non-encodable /* ? */ { 0x19, 2 }, // /* 0x40 */ /* @ */ { 0, 0 }, // non-encodable /* A */ { 0x03, 1 }, // /* B */ { 0x19, 1 }, // /* C */ { 0x0e, 1 }, // /* D */ { 0x09, 1 }, // /* E */ { 0x01, 1 }, // /* F */ { 0x0d, 1 }, // /* G */ { 0x1a, 1 }, // /* H */ { 0x14, 1 }, // /* I */ { 0x06, 1 }, // /* J */ { 0x0b, 1 }, // /* K */ { 0x0f, 1 }, // /* L */ { 0x12, 1 }, // /* M */ { 0x1c, 1 }, // /* N */ { 0x0c, 1 }, // /* O */ { 0x18, 1 }, // /* 0x50 */ /* P */ { 0x16, 1 }, // /* Q */ { 0x17, 1 }, // /* R */ { 0x0a, 1 }, // /* S */ { 0x05, 1 }, // /* T */ { 0x10, 1 }, // /* U */ { 0x07, 1 }, // /* V */ { 0x1e, 1 }, // /* W */ { 0x13, 1 }, // /* X */ { 0x1d, 1 }, // /* Y */ { 0x15, 1 }, // /* Z */ { 0x11, 1 }, // /* [ */ { 0, 0 }, // non-encodable /* \\ */ { 0, 0 }, // non-encodable /* ] */ { 0, 0 }, // non-encodable /* ^ */ { 0, 0 }, // non-encodable /* _ */ { 0, 0 }, // non-encodable }; #define BAUDOT_LTRS 0x1F #define BAUDOT_FIGS 0x1B #define BAUDOT_SPACE 0x04 /* * 0 unknown state * 1 LTRS state * 2 FIGS state */ static int baudot_charset = 0; // FIXME void baudot_reset() { baudot_charset = 1; } /* * Returns 1 if *char_outp was stuffed with an output character * or 0 if no output character was stuffed (in other words, returns * the count of characters decoded and stuffed). */ int baudot_decode( char *char_outp, unsigned char databits ) { /* Baudot (RTTY) */ assert( (databits & ~0x1F) == 0 ); int stuff_char = 1; if ( databits == BAUDOT_FIGS ) { baudot_charset = 2; stuff_char = 0; } else if ( databits == BAUDOT_LTRS ) { baudot_charset = 1; stuff_char = 0; } else if ( databits == BAUDOT_SPACE ) { /* RX un-shift on space */ baudot_charset = 1; } if ( stuff_char ) { int t; if ( baudot_charset == 1 ) t = 0; else t = 1; // U.S. figs // t = 2; // CCITT figs *char_outp = baudot_decode_table[databits][t]; } return stuff_char; } static void baudot_skip_warning( char char_out ) { unsigned char byte = char_out; fprintf(stderr, "W: baudot skipping non-encodable character '%c' 0x%02x\n", char_out, byte); } /* * Returns the number of 5-bit data words stuffed into *databits_outp (1 or 2) */ int baudot_encode( unsigned int *databits_outp, char char_out ) { char_out = toupper(char_out); if( char_out >= 0x60 || char_out < 0 ) { baudot_skip_warning(char_out); return 0; } unsigned char ind = char_out; int n = 0; unsigned char charset_mask = baudot_encode_table[ind][1]; debug_log("I: (baudot_charset==%u) input character '%c' 0x%02x charset_mask=%u\n", baudot_charset, char_out, char_out, charset_mask); if ( (baudot_charset & charset_mask ) == 0 ) { if ( charset_mask == 0 ) { baudot_skip_warning(char_out); return 0; } if ( baudot_charset == 0 ) baudot_charset = 1; if ( charset_mask != 3 ) baudot_charset = charset_mask; if ( baudot_charset == 1 ) databits_outp[n++] = BAUDOT_LTRS; else if ( baudot_charset == 2 ) databits_outp[n++] = BAUDOT_FIGS; else assert(0); debug_log("I: emit charset select 0x%02X\n", databits_outp[n-1]); } if ( !( baudot_charset == 1 || baudot_charset == 2 ) ) { fprintf(stderr, "E: baudot input character failed '%c' 0x%02x\n", char_out, char_out); fprintf(stderr, "E: baudot_charset==%u\n", baudot_charset); assert(0); } databits_outp[n++] = baudot_encode_table[ind][0]; /* TX un-shift on space */ if ( char_out == ' ' ) baudot_charset = 1; return n; } minimodem-0.23/src/minimodem.10000664000175000017500000002032212661703421013167 00000000000000.\" Hey, EMACS: -*- nroff -*- .\" First parameter, NAME, should be all caps .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection .\" other parameters are allowed: see man(7), man(1) .TH MINIMODEM 1 "June 10, 2013" .\" Please adjust this date whenever revising the manpage. .\" .\" Some roff macros, for reference: .\" .nh disable hyphenation .\" .hy enable hyphenation .\" .ad l left justify .\" .ad b justify to both left and right margins .\" .nf disable filling .\" .fi enable filling .\" .br insert line break .\" .sp insert n+1 empty lines .\" for manpage-specific macros, see man(7) .SH NAME minimodem \- general-purpose software audio FSK modem .SH SYNOPSIS .B minimodem --tx .RI [ options ] .I {baudmode} .br .B minimodem --rx .RI [ options ] .I {baudmode} .SH DESCRIPTION .B Minimodem is a command-line program which decodes (or generates) audio modem tones at any specified baud rate, using various framing protocols. It acts a general-purpose software FSK modem, and includes support for various standard FSK protocols such as Bell103, Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID. .PP .B Minimodem can play and capture audio modem tones in real-time via the system audio device, or in batched mode via audio files. .PP .B Minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers using radio, telephone, or another audio communications medium. .SH "TX/RX MODE" .TP .B \-t, \-\-tx, \-\-transmit, \-\-write transmit mode: generate audio tones .TP .B \-r, \-\-rx, \-\-receive, \-\-read receive mode: decode audio tones .SH {baudmode} The required \fI{baudmode}\fR parameter may be any floating-point value to specify a baud rate, or any of the special keywords listed below. The \fI{baudmode}\fR also implies certain other parameter defaults depending on the rate, including standard (or at least reasonable) default mark and space tone frequencies. .TP .B {any floating point value N} : Bell202-style at N bps \-\-ascii .TP .B 1200 : Bell202 1200 bps \-\-ascii .TP .B 300 : Bell103 300 bps \-\-ascii .TP .B rtty : RTTY 45.45 bps \-\-baudot \-\-stopbits 1.5 .TP .B tdd : TTY/TDD 45.45 bps \-\-baudot \-\-stopbits 2.0 .TP .B same : SAME 520.83 bps \-\-startbits 0 \-\-stopbits 0 \-\-sync-byte 0xAB .br NOAA Specific Area Message Encoding (SAME) protocol .TP .B callerid : Bell202 1200 bps Caller-ID (MDMF or SDMF) protocol .TP .B uic-train : UIC-751-3 600 bps train-to-ground message protocol .TP .B uic-ground : UIC-751-3 600 bps ground-to-train message protocol .SH OPTIONS .TP .B \-a, \-\-auto-carrier Automatically detect mark and space frequences from carrier. .TP .B \-i, \-\-inverted Invert the mark and space frequencies (applies whether the frequencies are defaults, discovered by \-\-auto-carrier, or specified manually). .TP .B \-c, \-\-confidence min-confidence-threshold Set receive confidence minimum threshold (default 1.5). The "confidence" value is a metric based primarily on the SNR (signal-to-noise ratio) of the received signal. This value acts as an FSK decoder "squelch" control. Increase to accept only very clean signals (up to INFINITY, but a value around 5.0 is more practical). Decrease to accept partial decoding of noisy signals (down to a minimum value of 1.0). (This option applies to \-\-rx mode only). .B \-l, \-\-limit max-confidence-search-limit Set receive confidence maximum search limit (default 2.3). The "confidence" value is as described above. This value acts as a performance vs. analysis quality control. Increase (up to INFINITY) for a more pedantic analysis and higher CPU usage. Decrease (down to the min-confidence-threshold) for a sloppier analysis, with lower CPU usage. (This option applies to \-\-rx mode only). .TP .B \-8, \-\-ascii ASCII 8\-N\-1 .TP .B \-5, \-\-baudot Baudot 5\-N\-1.5 .TP .B \-f, \-\-file filename.wav encode or decode an audio file (extension sets audio format) .TP .B \-b, \-\-bandwidth {rx_bandwidth} .TP .B \-v, \-\-volume {tx_amplitude or 'E'} Sets the generated signal amplitude (default is 1.0). As a special case useful for testing, the value 'E' sets the amplitude to the very small value FLT_EPSILON. (This option applies to \-\-tx mode only). .TP .B \-M, \-\-mark {mark_freq} .TP .B \-S, \-\-space {space_freq} .TP .B \-\-startbits {n} Sets the number of start bits (default is 1 for most baudmodes). .TP .B \-\-stopbits {n.n} Sets the number of stop bits (default is 1.0 for most baudmodes). .TP .B \-\-sync-byte {0xXX} If this option is used, initial carrier acquisition will be suppressed until after one or more consecutive data frame(s) containing this value are received. This can be used to synchronize the stream for protocols which include a fixed preamble byte. (This option applies to \-\-rx mode only). .TP .B \-q, \-\-quiet Do not report CARRIER / NOCARRIER or signal analysis metrics. .TP .B \-R, \-\-samplerate {rate} Set the audio sample rate (default rate is 48000 Hz). .TP .B \-A, \-\-alsa[={plughw:X,Y | X,Y | X }] Use ALSA as the audio output system instead of the default PulseAudio (depending on build configuration options). The ALSA device alias "default" is used, if a specific device is not specified. For example, the following options all select ALSA device #1, sub-device #0: \-\-alsa=plughw:1,0 \-\-alsa=1,0 \-A1 .TP .B \-\-lut={tx_sin_table_len} Minimodem uses a precomputed sine wave lookup table of 1024 elements, or the size specified here. Use \-\-lut=0 to disable the use of the sine wave lookup table. (This option applies to \-\-tx mode only). .TP .B \-\-float-samples Generate 32-bit floating-point format audio samples, instead of the default 16-bit signed integer format (applies to \-\-tx mode only; \-\-rx mode always uses 32-bit floating-point). .TP .B \-\-rx-one Quit after the first carrier/no-carrier event (applies to \-\-rx mode only). .TP .B \-\-binary-output Print received data bits as raw binary output using characters '0' and '1'. The bits are printed in the order they are received. Framing bits (start and stop bits) are omitted from the output. (This option applies to \-\-rx mode only). .TP .B \-\-binary-raw {nbits} Print all received bits (data bits and any framing bits) as raw binary output using characters '0' and '1'. Framing bits are not interpreted, but simply passed through to the output. The bits are printed in the order they are received, in lines {nbits} wide. So in order to display a standard 8-N-1 bitstream (8 databits + 1 start bit + 1 stop bit), use "--binary-raw 10" or a multiple of 10. (This option applies to \-\-rx mode only). .TP .B \-\-print-filter Filter the received text output, replacing any "non-printable" bytes with a '.' character. (This option applies to \-\-rx mode only). .TP .B \-\-tx-carrier When transmitting from a blocking source, keep a carrier going while waiting for more data. .TP .B \-\-benchmarks Run and report internal performance tests (all other flags are ignored). .TP .B \-V, \-\-version print program version .SH EXAMPLES .TP .B minimodem --tx 100 Transmit 100 baud tones from one computer ... .TP .B minimodem --rx 100 and receive 100 baud tones on another nearby computer. .TP .B minimodem --rx -a rtty Decode amateur radio RTTY signals (listen near 14.085 MHz). .TP .B minimodem --rx same Decode NOAA SAME protocol emergency alert transmissions, e.g. .br . .TP .B minimodem --tx 0.5 Experiment with very low baud rates (works in noisy conditions). .TP .B minimodem --tx 12000 Experiment with very high baud rates (works with audio files). .SH NOTES .B minimodem does not decode AX.25 framed packets. .PP .B minimodem does not support modem control ("AT") commands, nor does it produce DTMF telephone dialing tones. .SH VERSION This page documents .B minimodem version 0.23. The latest version is available at . .SH AUTHOR .B minimodem was written by Kamal Mostafa . .SH COPYRIGHT Copyright \(co 2011-2016 by Kamal Mostafa . License GPLv3+: GNU GPL version 3 or later . .br This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. minimodem-0.23/src/baudot.h0000664000175000017500000000221112036617057012560 00000000000000/* * baudot.h * * Copyright (C) 2011 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ void baudot_reset(); /* * Returns 1 if *char_outp was stuffed with an output character * or 0 if no output character was stuffed (in other words, returns * the count of characters decoded and stuffed). */ int baudot_decode( char *char_outp, unsigned char databits ); /* * Returns the number of 5-bit datawords stuffed into *databits_outp (1 or 2) */ int baudot_encode( unsigned int *databits_outp, char char_out ); minimodem-0.23/src/fsk.c0000664000175000017500000004202112661674204012064 00000000000000/* * fsk.c * * Copyright (C) 2011-2016 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include // fabsf, hypotf #include // FLT_EPSILON #include #include #include #include #include "fsk.h" fsk_plan * fsk_plan_new( float sample_rate, float f_mark, float f_space, float filter_bw ) { fsk_plan *fskp = malloc(sizeof(fsk_plan)); if ( !fskp ) return NULL; fskp->sample_rate = sample_rate; fskp->f_mark = f_mark; fskp->f_space = f_space; #ifdef USE_FFT fskp->band_width = filter_bw; float fft_half_bw = fskp->band_width / 2.0f; fskp->fftsize = (sample_rate + fft_half_bw) / fskp->band_width; fskp->nbands = fskp->fftsize / 2 + 1; fskp->b_mark = (f_mark + fft_half_bw) / fskp->band_width; fskp->b_space = (f_space + fft_half_bw) / fskp->band_width; if ( fskp->b_mark >= fskp->nbands || fskp->b_space >= fskp->nbands ) { fprintf(stderr, "b_mark=%u or b_space=%u is invalid (nbands=%u)\n", fskp->b_mark, fskp->b_space, fskp->nbands); free(fskp); errno = EINVAL; return NULL; } debug_log("### b_mark=%u b_space=%u fftsize=%u\n", fskp->b_mark, fskp->b_space, fskp->fftsize); // FIXME: unsigned int pa_nchannels = 1; // FIXME check these: fskp->fftin = fftwf_malloc(fskp->fftsize * sizeof(float) * pa_nchannels); bzero(fskp->fftin, (fskp->fftsize * sizeof(float) * pa_nchannels)); fskp->fftout = fftwf_malloc(fskp->nbands * sizeof(fftwf_complex) * pa_nchannels); /* complex fftw plan, works for N channels: */ fskp->fftplan = fftwf_plan_many_dft_r2c( /*rank*/1, &fskp->fftsize, /*howmany*/pa_nchannels, fskp->fftin, NULL, /*istride*/pa_nchannels, /*idist*/1, fskp->fftout, NULL, /*ostride*/1, /*odist*/fskp->nbands, FFTW_ESTIMATE); if ( !fskp->fftplan ) { fprintf(stderr, "fftwf_plan_dft_r2c_1d() failed\n"); fftwf_free(fskp->fftin); fftwf_free(fskp->fftout); free(fskp); errno = EINVAL; return NULL; } #endif return fskp; } void fsk_plan_destroy( fsk_plan *fskp ) { fftwf_free(fskp->fftin); fftwf_free(fskp->fftout); fftwf_destroy_plan(fskp->fftplan); free(fskp); } static inline float band_mag( fftwf_complex * const cplx, unsigned int band, float scalar ) { float re = cplx[band][0]; float im = cplx[band][1]; float mag = hypotf(re, im) * scalar; return mag; } static void fsk_bit_analyze( fsk_plan *fskp, float *samples, unsigned int bit_nsamples, unsigned int *bit_outp, float *bit_signal_mag_outp, float *bit_noise_mag_outp ) { // FIXME: Fast and loose ... don't bzero fftin, just assume its only ever // been used for bit_nsamples so the remainder is still zeroed. Sketchy. // // unsigned int pa_nchannels = 1; // FIXME // bzero(fskp->fftin, (fskp->fftsize * sizeof(float) * pa_nchannels)); memcpy(fskp->fftin, samples, bit_nsamples * sizeof(float)); float magscalar = 2.0f / (float)bit_nsamples; #if 0 //// apodization window //// raised cosine windows # if 0 float a0=0.54, a1=(1.0f - a0); // Hamming window # else float a0=0.5, a1=0.5; // Hann window # endif magscalar /= a0; // true for all raised cosine windows (I think) int i; for ( i=0; ifftin[i] *= w; } #endif fftwf_execute(fskp->fftplan); float mag_mark = band_mag(fskp->fftout, fskp->b_mark, magscalar); float mag_space = band_mag(fskp->fftout, fskp->b_space, magscalar); // mark==1, space==0 if ( mag_mark > mag_space ) { *bit_outp = 1; *bit_signal_mag_outp = mag_mark; *bit_noise_mag_outp = mag_space; } else { *bit_outp = 0; *bit_signal_mag_outp = mag_space; *bit_noise_mag_outp = mag_mark; } debug_log( "\t%.2f %.2f %s bit=%u sig=%.2f noise=%.2f\n", mag_mark, mag_space, mag_mark > mag_space ? "mark " : " space", *bit_outp, *bit_signal_mag_outp, *bit_noise_mag_outp); } /* returns confidence value [0.0 to INFINITY] */ static float fsk_frame_analyze( fsk_plan *fskp, float *samples, float samples_per_bit, int n_bits, const char *expect_bits_string, unsigned long long *bits_outp, float *ampl_outp ) { unsigned int bit_nsamples = (float)(samples_per_bit + 0.5f); unsigned int bit_values[64]; float bit_sig_mags[64]; float bit_noise_mags[64]; unsigned int bit_begin_sample; int bitnum; // various deprecated noise limiter schemes: //#define FSK_MIN_BIT_SNR 1.4 //#define FSK_MIN_MAGNITUDE 0.10 //#define FSK_AVOID_TRANSIENTS 0.7 const char *expect_bits = expect_bits_string; /* pass #1 - process and check only the "required" (1/0) expect_bits */ for ( bitnum=0; bitnum (s_mag * FSK_AVOID_TRANSIENTS) ) { debug_log(" avoid transient\n"); return 0.0; } #endif /* pass #2 - process only the dontcare ('d') expect_bits */ for ( bitnum=0; bitnum FLT_EPSILON ) total_bit_noise += bit_noise_mags[bitnum]; if ( bit_values[bitnum] == 1 ) { avg_mark_sig += bit_sig_mags[bitnum]; n_mark++; } else { avg_space_sig += bit_sig_mags[bitnum]; n_space++; } } // Compute the "frame SNR" float snr = total_bit_sig / total_bit_noise; // Compute avg bit sig and noise magnitudes float avg_bit_sig = total_bit_sig / n_bits; // Compute separate avg bit sig for mark and space if ( n_mark ) avg_mark_sig /= n_mark; if ( n_space ) avg_space_sig /= n_space; #if CONFIDENCE_ALGO == 6 // Compute average "divergence": bit_mag_divergence / other_bits_mag float divergence = 0.0; for ( bitnum=0; bitnum= (int)try_max_nsamples ) break; if ( t < 0 ) continue; float c, ampl_out; unsigned long long bits_out = 0; debug_log("try fsk_frame_analyze at t=%d\n", t); c = fsk_frame_analyze(fskp, samples+t, samples_per_bit, expect_n_bits, expect_bits_string, &bits_out, &l_out); if ( best_c < c ) { best_t = t; best_c = c; best_a = ampl_out; best_bits = bits_out; // If we find a frame with confidence > try_confidence_search_limit // quit searching. if ( best_c >= try_confidence_search_limit ) break; } } *bits_outp = best_bits; *ampl_outp = best_a; *frame_start_outp = best_t; float confidence = best_c; if ( confidence == 0 ) return 0; #ifdef FSK_DEBUG unsigned char bitchar; // FIXME? hardcoded chop off framing bits for debug // Hmmm... we have now way to distinguish between: // 8-bit data with no start/stopbits == 8 bits // 5-bit with prevstop+start+stop == 8 bits switch ( expect_n_bits ) { case 11: bitchar = ( *bits_outp >> 2 ) & 0xFF; break; case 8: default: bitchar = *bits_outp & 0xFF; break; } debug_log("FSK_FRAME bits='"); for ( j=0; j> j ) & 1 ? '1' : '0' ); debug_log("' datum='%c' (0x%02x) c=%f a=%f t=%d\n", isprint(bitchar)||isspace(bitchar) ? bitchar : '.', bitchar, confidence, best_a, best_t); #endif return confidence; } // #define FSK_AUTODETECT_MIN_FREQ 600 // #define FSK_AUTODETECT_MAX_FREQ 5000 int fsk_detect_carrier(fsk_plan *fskp, float *samples, unsigned int nsamples, float min_mag_threshold ) { assert( nsamples <= fskp->fftsize ); unsigned int pa_nchannels = 1; // FIXME bzero(fskp->fftin, (fskp->fftsize * sizeof(float) * pa_nchannels)); memcpy(fskp->fftin, samples, nsamples * sizeof(float)); fftwf_execute(fskp->fftplan); float magscalar = 1.0f / ((float)nsamples/2.0f); float max_mag = 0.0; int max_mag_band = -1; int i = 1; /* start detection at the first non-DC band */ int nbands = fskp->nbands; #ifdef FSK_AUTODETECT_MIN_FREQ i = (FSK_AUTODETECT_MIN_FREQ + (fskp->band_width/2)) / fskp->band_width; #endif #ifdef FSK_AUTODETECT_MAX_FREQ nbands = (FSK_AUTODETECT_MAX_FREQ + (fskp->band_width/2)) / fskp->band_width; if ( nbands > fskp->nbands ) nbands = fskp->nbands: #endif for ( ; ifftout, i, magscalar); if ( mag < min_mag_threshold ) continue; if ( max_mag < mag ) { max_mag = mag; max_mag_band = i; } } if ( max_mag_band < 0 ) return -1; return max_mag_band; } void fsk_set_tones_by_bandshift( fsk_plan *fskp, unsigned int b_mark, int b_shift ) { assert( b_shift != 0 ); assert( b_mark < fskp->nbands ); int b_space = b_mark + b_shift; assert( b_space >= 0 ); assert( b_space < fskp->nbands ); fskp->b_mark = b_mark; fskp->b_space = b_space; fskp->f_mark = b_mark * fskp->band_width; fskp->f_space = b_space * fskp->band_width; } minimodem-0.23/src/simpleaudio.c0000644000175000017500000001002712312140553013577 00000000000000/* * simpleaudio.c * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "simpleaudio.h" #include "simpleaudio_internal.h" #include #include #include #ifdef HAVE_CONFIG_H #include "config.h" #else # define USE_PULSEAUDIO 1 # define USE_ALSA 1 #endif simpleaudio * simpleaudio_open_stream( sa_backend_t sa_backend, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ) { simpleaudio *sa = calloc(1, sizeof(simpleaudio)); if ( !sa ) { perror("malloc"); return NULL; } sa->format = sa_format; sa->rate = rate; sa->channels = channels; switch ( sa_format ) { case SA_SAMPLE_FORMAT_FLOAT: assert( sizeof(float) == 4 ); sa->samplesize = sizeof(float); break; case SA_SAMPLE_FORMAT_S16: assert( sizeof(short) == 2 ); sa->samplesize = sizeof(short); break; default: fprintf(stderr, "simpleaudio_open_stream: no such sa_format (%d)\n", sa_format); goto err_out; break; } switch ( sa_backend ) { #if USE_SNDFILE case SA_BACKEND_FILE: sa->backend = &simpleaudio_backend_sndfile; break; #endif #if USE_BENCHMARKS case SA_BACKEND_BENCHMARK: sa->backend = &simpleaudio_backend_benchmark; break; #endif case SA_BACKEND_SYSDEFAULT: #if USE_PULSEAUDIO sa->backend = &simpleaudio_backend_pulseaudio; #elif USE_ALSA sa->backend = &simpleaudio_backend_alsa; #else fprintf(stderr, "simpleaudio_open_stream: no SA_BACKEND_SYSDEFAULT was configured\n"); goto err_out; #endif break; #if USE_ALSA case SA_BACKEND_ALSA: sa->backend = &simpleaudio_backend_alsa; break; #endif #if USE_PULSEAUDIO case SA_BACKEND_PULSEAUDIO: sa->backend = &simpleaudio_backend_pulseaudio; break; #endif default: fprintf(stderr, "simpleaudio_open_stream: no such sa_backend (%d). not configured at build?\n", sa_backend); goto err_out; } int ok = sa->backend->simpleaudio_open_stream(sa, backend_device, sa_stream_direction, sa_format, rate, channels, app_name, stream_name); if ( sa->channels != channels ) { fprintf(stderr, "%s: input stream must be %u-channel (not %u)\n", stream_name, channels, sa->channels); simpleaudio_close(sa); return 0; } if ( ok ) { assert( sa->backend_framesize == sa->channels * sa->samplesize ); return sa; } err_out: free(sa); return NULL; } sa_format_t simpleaudio_get_format( simpleaudio *sa ) { return sa->format; } unsigned int simpleaudio_get_rate( simpleaudio *sa ) { return sa->rate; } unsigned int simpleaudio_get_channels( simpleaudio *sa ) { return sa->channels; } unsigned int simpleaudio_get_framesize( simpleaudio *sa ) { return sa->backend_framesize; } unsigned int simpleaudio_get_samplesize( simpleaudio *sa ) { return sa->samplesize; } void simpleaudio_set_rxnoise( simpleaudio *sa, float rxnoise_factor ) { sa->rxnoise = rxnoise_factor; } ssize_t simpleaudio_read( simpleaudio *sa, void *buf, size_t nframes ) { return sa->backend->simpleaudio_read(sa, buf, nframes); } ssize_t simpleaudio_write( simpleaudio *sa, void *buf, size_t nframes ) { return sa->backend->simpleaudio_write(sa, buf, nframes); } void simpleaudio_close( simpleaudio *sa ) { sa->backend->simpleaudio_close(sa); free(sa); } minimodem-0.23/src/Makefile.in0000664000175000017500000005625112661703417013213 00000000000000# Makefile.in generated by automake 1.15 from Makefile.am. # @configure_input@ # Copyright (C) 1994-2014 Free Software Foundation, Inc. # This Makefile.in is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. @SET_MAKE@ # # Makefile.am # # Copyright (C) 2011-2016 Kamal Mostafa # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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exit 1; } # Tell versions [3.59,3.63) of GNU make to not export all variables. # Otherwise a system limit (for SysV at least) may be exceeded. .NOEXPORT: minimodem-0.23/src/simpleaudio-sndfile.c0000644000175000017500000001164612566372134015246 00000000000000/* * simpleaudio-sndfile.c * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #if USE_SNDFILE #include #include #include #include #include #include "simpleaudio.h" #include "simpleaudio_internal.h" /* * sndfile backend for simpleaudio */ static ssize_t sa_sndfile_read( simpleaudio *sa, void *buf, size_t nframes ) { SNDFILE *s = (SNDFILE *)sa->backend_handle; int n; switch ( sa->format ) { case SA_SAMPLE_FORMAT_FLOAT: n = sf_readf_float(s, buf, nframes); break; case SA_SAMPLE_FORMAT_S16: n = sf_readf_short(s, buf, nframes); break; default: assert(0); break; } if ( n < 0 ) { fprintf(stderr, "sf_read: "); sf_perror(s); return -1; } if ( sa->rxnoise != 0.0f ) { int i; float *fbuf = buf; float f = sa->rxnoise * 2; for ( i=0; ibackend_handle; int n; switch ( sa->format ) { case SA_SAMPLE_FORMAT_FLOAT: n = sf_writef_float(s, buf, nframes); break; case SA_SAMPLE_FORMAT_S16: n = sf_writef_short(s, buf, nframes); break; default: assert(0); break; } if ( n < 0 ) { fprintf(stderr, "sf_write: "); sf_perror(s); return -1; } return n; } static void sa_sndfile_close( simpleaudio *sa ) { sf_close(sa->backend_handle); } /* (Why) doesn't libsndfile provide an API for this?... */ static const struct sndfile_format { unsigned int major_format; char *str; } sndfile_formats[] = { { SF_FORMAT_WAV, "WAV" }, { SF_FORMAT_AIFF, "AIFF" }, { SF_FORMAT_AU, "AU" }, { SF_FORMAT_RAW, "RAW" }, { SF_FORMAT_PAF, "PAF" }, { SF_FORMAT_SVX, "SVX" }, { SF_FORMAT_NIST, "NIST" }, { SF_FORMAT_VOC, "VOC" }, { SF_FORMAT_IRCAM, "IRCAM" }, { SF_FORMAT_W64, "W64" }, { SF_FORMAT_MAT4, "MAT4" }, { SF_FORMAT_MAT5, "MAT5" }, { SF_FORMAT_PVF, "PVF" }, { SF_FORMAT_XI, "XI" }, { SF_FORMAT_HTK, "HTK" }, { SF_FORMAT_SDS, "SDS" }, { SF_FORMAT_AVR, "AVR" }, { SF_FORMAT_WAVEX, "WAVEX" }, { SF_FORMAT_SD2, "SD2" }, { SF_FORMAT_FLAC, "FLAC" }, { SF_FORMAT_CAF, "CAF" }, { SF_FORMAT_WVE, "WVE" }, { SF_FORMAT_OGG, "OGG" }, { SF_FORMAT_MPC2K, "MPC2K" }, { SF_FORMAT_RF64, "RF64" }, { 0, 0 } }; static unsigned int sndfile_format_from_path( const char *path ) { const char *p = strrchr(path, '.'); if ( p ) p++; else p = path; const struct sndfile_format *sfmt; for ( sfmt=sndfile_formats; sfmt->str; sfmt++ ) if ( strcasecmp(sfmt->str,p) == 0 ) return sfmt->major_format; return SF_FORMAT_WAV; } static int sa_sndfile_open_stream( simpleaudio *sa, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ) { const char *path = stream_name; int sf_format; switch ( sa->format ) { case SA_SAMPLE_FORMAT_FLOAT: sf_format = SF_FORMAT_FLOAT; break; case SA_SAMPLE_FORMAT_S16: sf_format = SF_FORMAT_PCM_16; break; default: assert(0); } /* setting for SA_STREAM_PLAYBACK (file write) */ SF_INFO sfinfo = { .format = sf_format, .samplerate = rate, .channels = channels, }; if ( sa_stream_direction == SA_STREAM_PLAYBACK ) sfinfo.format = sndfile_format_from_path(path) | sf_format; /* Create the recording stream */ SNDFILE *s; s = sf_open(path, sa_stream_direction == SA_STREAM_RECORD ? SFM_READ : SFM_WRITE, &sfinfo); if ( !s ) { fprintf(stderr, "%s: ", path); sf_perror(s); return 0; } /* good or bad to override these? */ sa->rate = sfinfo.samplerate; sa->channels = sfinfo.channels; sa->backend_handle = s; sa->backend_framesize = sa->channels * sa->samplesize; return 1; } const struct simpleaudio_backend simpleaudio_backend_sndfile = { sa_sndfile_open_stream, sa_sndfile_read, sa_sndfile_write, sa_sndfile_close, }; #endif /* USE_SNDFILE */ minimodem-0.23/src/simple-tone-generator.c0000664000175000017500000001033012661674204015517 00000000000000/* * simple-tone-generator.c * * Copyright (C) 2011-2016 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include #include "simpleaudio.h" static float tone_mag = 1.0; static unsigned int sin_table_len; static short *sin_table_short; static float *sin_table_float; void simpleaudio_tone_init( unsigned int new_sin_table_len, float mag ) { sin_table_len = new_sin_table_len; tone_mag = mag; if ( sin_table_len != 0 ) { sin_table_short = realloc(sin_table_short, sin_table_len * sizeof(short)); sin_table_float = realloc(sin_table_float, sin_table_len * sizeof(float)); if ( !sin_table_short || !sin_table_float ) { perror("malloc"); assert(0); } unsigned int i; unsigned short mag_s = 32767.0f * tone_mag + 0.5f; if ( tone_mag > 1.0f ) // clamp to 1.0 to avoid overflow mag_s = 32767; if ( mag_s < 1 ) // "short epsilon" mag_s = 1; for ( i=0; i 1.0f ) // clamp to 1.0 to avoid overflow mag_s = 32767; if ( mag_s < 1 ) // "short epsilon" mag_s = 1; for ( i=0; i 0 ); free(buf); } minimodem-0.23/src/databits_ascii.c0000664000175000017500000000244212433467730014250 00000000000000/* * databits_ascii.c * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "databits.h" /* * ASCII 8-bit data databits decoder/encoder (passthrough) */ /* returns the number of datawords stuffed into *databits_outp */ int databits_encode_ascii8( unsigned int *databits_outp, char char_out ) { *databits_outp = char_out; return 1; } /* returns nbytes decoded */ unsigned int databits_decode_ascii8( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ) { if ( ! dataout_p ) // databits processor reset: noop return 0; bits &= 0xFF; *dataout_p = bits; return 1; } minimodem-0.23/src/minimodem.1.html0000664000175000017500000003316612661703421014144 00000000000000 MINIMODEM

MINIMODEM

NAME
SYNOPSIS
DESCRIPTION
TX/RX MODE
{baudmode}
OPTIONS
EXAMPLES
NOTES
VERSION
AUTHOR
COPYRIGHT

NAME

minimodem − general-purpose software audio FSK modem

SYNOPSIS

minimodem --tx [options] {baudmode}
minimodem --rx [options] {baudmode}

DESCRIPTION

Minimodem is a command-line program which decodes (or generates) audio modem tones at any specified baud rate, using various framing protocols. It acts a general-purpose software FSK modem, and includes support for various standard FSK protocols such as Bell103, Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID.

Minimodem can play and capture audio modem tones in real-time via the system audio device, or in batched mode via audio files.

Minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers using radio, telephone, or another audio communications medium.

TX/RX MODE

−t, −−tx, −−transmit, −−write

transmit mode: generate audio tones

−r, −−rx, −−receive, −−read

receive mode: decode audio tones

{baudmode}

The required {baudmode} parameter may be any floating-point value to specify a baud rate, or any of the special keywords listed below. The {baudmode} also implies certain other parameter defaults depending on the rate, including standard (or at least reasonable) default mark and space tone frequencies.
{any floating point value N}

: Bell202-style at N bps −−ascii

1200

: Bell202 1200 bps −−ascii

300

: Bell103 300 bps −−ascii

rtty

: RTTY 45.45 bps −−baudot −−stopbits 1.5

tdd

: TTY/TDD 45.45 bps −−baudot −−stopbits 2.0

same

: SAME 520.83 bps −−startbits 0 −−stopbits 0 −−sync-byte 0xAB

NOAA Specific Area Message Encoding (SAME) protocol

callerid

: Bell202 1200 bps Caller-ID (MDMF or SDMF) protocol

uic-train

: UIC-751-3 600 bps train-to-ground message protocol

uic-ground

: UIC-751-3 600 bps ground-to-train message protocol

OPTIONS

−a, −−auto-carrier

Automatically detect mark and space frequences from carrier.

−i, −−inverted

Invert the mark and space frequencies (applies whether the frequencies are defaults, discovered by −−auto-carrier, or specified manually).

−c, −−confidence min-confidence-threshold

Set receive confidence minimum threshold (default 1.5). The "confidence" value is a metric based primarily on the SNR (signal-to-noise ratio) of the received signal. This value acts as an FSK decoder "squelch" control. Increase to accept only very clean signals (up to INFINITY, but a value around 5.0 is more practical). Decrease to accept partial decoding of noisy signals (down to a minimum value of 1.0). (This option applies to −−rx mode only). −l, −−limit max-confidence-search-limit Set receive confidence maximum search limit (default 2.3). The "confidence" value is as described above. This value acts as a performance vs. analysis quality control. Increase (up to INFINITY) for a more pedantic analysis and higher CPU usage. Decrease (down to the min-confidence-threshold) for a sloppier analysis, with lower CPU usage. (This option applies to −−rx mode only).

−8, −−ascii

ASCII 8−N−1

−5, −−baudot

Baudot 5−N−1.5

−f, −−file filename.wav

encode or decode an audio file (extension sets audio format)

−b, −−bandwidth {rx_bandwidth}
−v, −−volume {tx_amplitude or ’E’}

Sets the generated signal amplitude (default is 1.0). As a special case useful for testing, the value ’E’ sets the amplitude to the very small value FLT_EPSILON. (This option applies to −−tx mode only).

−M, −−mark {mark_freq}
−S, −−space {space_freq}
−−startbits {n}

Sets the number of start bits (default is 1 for most baudmodes).

−−stopbits {n.n}

Sets the number of stop bits (default is 1.0 for most baudmodes).

−−sync-byte {0xXX}

If this option is used, initial carrier acquisition will be suppressed until after one or more consecutive data frame(s) containing this value are received. This can be used to synchronize the stream for protocols which include a fixed preamble byte. (This option applies to −−rx mode only).

−q, −−quiet

Do not report CARRIER / NOCARRIER or signal analysis metrics.

−R, −−samplerate {rate}

Set the audio sample rate (default rate is 48000 Hz).

−A, −−alsa[={plughw:X,Y | X,Y | X }]

Use ALSA as the audio output system instead of the default PulseAudio (depending on build configuration options). The ALSA device alias "default" is used, if a specific device is not specified. For example, the following options all select ALSA device #1, sub-device #0:
−−alsa=plughw:1,0 −−alsa=1,0 −A1

−−lut={tx_sin_table_len}

Minimodem uses a precomputed sine wave lookup table of 1024 elements, or the size specified here. Use −−lut=0 to disable the use of the sine wave lookup table. (This option applies to −−tx mode only).

−−float-samples

Generate 32-bit floating-point format audio samples, instead of the default 16-bit signed integer format (applies to −−tx mode only; −−rx mode always uses 32-bit floating-point).

−−rx-one

Quit after the first carrier/no-carrier event (applies to −−rx mode only).

−−binary-output

Print received data bits as raw binary output using characters ’0’ and ’1’. The bits are printed in the order they are received. Framing bits (start and stop bits) are omitted from the output. (This option applies to −−rx mode only).

−−binary-raw {nbits}

Print all received bits (data bits and any framing bits) as raw binary output using characters ’0’ and ’1’. Framing bits are not interpreted, but simply passed through to the output. The bits are printed in the order they are received, in lines {nbits} wide. So in order to display a standard 8-N-1 bitstream (8 databits + 1 start bit + 1 stop bit), use "--binary-raw 10"
or a multiple of 10. (This option applies to −−rx mode only).

−−print-filter

Filter the received text output, replacing any "non-printable" bytes with a ’.’ character. (This option applies to −−rx mode only).

−−tx-carrier

When transmitting from a blocking source, keep a carrier going while waiting for more data.

−−benchmarks

Run and report internal performance tests (all other flags are ignored).

−V, −−version

print program version

EXAMPLES

minimodem --tx 100

Transmit 100 baud tones from one computer ...

minimodem --rx 100

and receive 100 baud tones on another nearby computer.

minimodem --rx -a rtty

Decode amateur radio RTTY signals (listen near 14.085 MHz).

minimodem --rx same

Decode NOAA SAME protocol emergency alert transmissions, e.g.
<http://en.wikipedia.org/wiki/Specific_Area_Message_Encoding>.

minimodem --tx 0.5

Experiment with very low baud rates (works in noisy conditions).

minimodem --tx 12000

Experiment with very high baud rates (works with audio files).

NOTES

minimodem does not decode AX.25 framed packets.

minimodem does not support modem control ("AT") commands, nor does it produce DTMF telephone dialing tones.

VERSION

This page documents minimodem version 0.23. The latest version is available at <http://www.whence.com/minimodem>.

AUTHOR

minimodem was written by Kamal Mostafa <kamal@whence.com>.

COPYRIGHT

Copyright © 2011-2016 by Kamal Mostafa <kamal@whence.com>. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

minimodem-0.23/src/uic_codes.c0000775000175000017500000000355512433467730013253 00000000000000/* * uic_codes.c * * Copyright (C) 2014 Marcos Vives Del Sol * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include "uic_codes.h" uic_message uic_ground_to_train_messages[] = { { 0x00, "Test" }, { 0x02, "Run slower" }, { 0x03, "Extension of telegram" }, { 0x04, "Run faster" }, { 0x06, "Written order" }, { 0x08, "Speech" }, { 0x09, "Emergency stop" }, { 0x0C, "Announcem. by loudspeaker" }, { 0x55, "Idle" }, { -1, NULL } }; uic_message uic_train_to_ground_messages[] = { { 0x08, "Communic. desired" }, { 0x0A, "Acknowl. of order" }, { 0x06, "Advice" }, { 0x00, "Test" }, { 0x09, "Train staff wish to comm." }, { 0x0C, "Telephone link desired" }, { 0x03, "Extension of telegram" }, { -1, NULL } }; const char * uic_message_meaning(unsigned int code, unsigned int type) { uic_message * messages; if (type == UIC_TYPE_GROUNDTRAIN) { messages = uic_ground_to_train_messages; } else if (type == UIC_TYPE_TRAINGROUND) { messages = uic_train_to_ground_messages; } else { assert(0); } while (messages->code != -1) { if (messages->code == code) { return messages->meaning; } messages++; } return "Unknown"; } minimodem-0.23/src/databits_uic.c0000775000175000017500000000366612433467730013754 00000000000000/* * databits_uic.c * * Copyright (C) 2014 Marcos Vives Del Sol * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include "databits.h" #include "uic_codes.h" /* * UIC-751-3 Ground-train decoder */ unsigned int databits_decode_uic(char *output, unsigned long long input, unsigned int type) { int written; if (!output) { return 0; } unsigned int code = (unsigned int) bit_reverse(bit_window(input, 24, 8), 8); written = sprintf(output, "Train ID: %X%X%X%X%X%X - Message: %02X (%s)\n", (unsigned int) bit_window(input, 0, 4), (unsigned int) bit_window(input, 4, 4), (unsigned int) bit_window(input, 8, 4), (unsigned int) bit_window(input, 12, 4), (unsigned int) bit_window(input, 16, 4), (unsigned int) bit_window(input, 20, 4), code, uic_message_meaning(code, type) ); return written; } unsigned int databits_decode_uic_ground(char *output, unsigned int outputSize, unsigned long long input, unsigned int inputSize) { return databits_decode_uic(output, input, UIC_TYPE_GROUNDTRAIN); } unsigned int databits_decode_uic_train(char *output, unsigned int outputSize, unsigned long long input, unsigned int inputSize) { return databits_decode_uic(output, input, UIC_TYPE_TRAINGROUND); } minimodem-0.23/src/uic_codes.h0000775000175000017500000000210012433467730013241 00000000000000/* * uic_codes.h * * Copyright (C) 2014 Marcos Vives Del Sol * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ typedef struct { unsigned int code; char * meaning; } uic_message; enum { UIC_TYPE_GROUNDTRAIN, UIC_TYPE_TRAINGROUND, }; extern uic_message uic_ground_to_train_messages[]; extern uic_message uic_train_to_ground_messages[]; const char * uic_message_meaning(unsigned int code, unsigned int type); minimodem-0.23/src/minimodem.1.in0000664000175000017500000002033712661673377013622 00000000000000.\" Hey, EMACS: -*- nroff -*- .\" First parameter, NAME, should be all caps .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection .\" other parameters are allowed: see man(7), man(1) .TH MINIMODEM 1 "June 10, 2013" .\" Please adjust this date whenever revising the manpage. .\" .\" Some roff macros, for reference: .\" .nh disable hyphenation .\" .hy enable hyphenation .\" .ad l left justify .\" .ad b justify to both left and right margins .\" .nf disable filling .\" .fi enable filling .\" .br insert line break .\" .sp insert n+1 empty lines .\" for manpage-specific macros, see man(7) .SH NAME minimodem \- general-purpose software audio FSK modem .SH SYNOPSIS .B minimodem --tx .RI [ options ] .I {baudmode} .br .B minimodem --rx .RI [ options ] .I {baudmode} .SH DESCRIPTION .B Minimodem is a command-line program which decodes (or generates) audio modem tones at any specified baud rate, using various framing protocols. It acts a general-purpose software FSK modem, and includes support for various standard FSK protocols such as Bell103, Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID. .PP .B Minimodem can play and capture audio modem tones in real-time via the system audio device, or in batched mode via audio files. .PP .B Minimodem can be used to transfer data between nearby computers using an audio cable (or just via sound waves), or between remote computers using radio, telephone, or another audio communications medium. .SH "TX/RX MODE" .TP .B \-t, \-\-tx, \-\-transmit, \-\-write transmit mode: generate audio tones .TP .B \-r, \-\-rx, \-\-receive, \-\-read receive mode: decode audio tones .SH {baudmode} The required \fI{baudmode}\fR parameter may be any floating-point value to specify a baud rate, or any of the special keywords listed below. The \fI{baudmode}\fR also implies certain other parameter defaults depending on the rate, including standard (or at least reasonable) default mark and space tone frequencies. .TP .B {any floating point value N} : Bell202-style at N bps \-\-ascii .TP .B 1200 : Bell202 1200 bps \-\-ascii .TP .B 300 : Bell103 300 bps \-\-ascii .TP .B rtty : RTTY 45.45 bps \-\-baudot \-\-stopbits 1.5 .TP .B tdd : TTY/TDD 45.45 bps \-\-baudot \-\-stopbits 2.0 .TP .B same : SAME 520.83 bps \-\-startbits 0 \-\-stopbits 0 \-\-sync-byte 0xAB .br NOAA Specific Area Message Encoding (SAME) protocol .TP .B callerid : Bell202 1200 bps Caller-ID (MDMF or SDMF) protocol .TP .B uic-train : UIC-751-3 600 bps train-to-ground message protocol .TP .B uic-ground : UIC-751-3 600 bps ground-to-train message protocol .SH OPTIONS .TP .B \-a, \-\-auto-carrier Automatically detect mark and space frequences from carrier. .TP .B \-i, \-\-inverted Invert the mark and space frequencies (applies whether the frequencies are defaults, discovered by \-\-auto-carrier, or specified manually). .TP .B \-c, \-\-confidence min-confidence-threshold Set receive confidence minimum threshold (default 1.5). The "confidence" value is a metric based primarily on the SNR (signal-to-noise ratio) of the received signal. This value acts as an FSK decoder "squelch" control. Increase to accept only very clean signals (up to INFINITY, but a value around 5.0 is more practical). Decrease to accept partial decoding of noisy signals (down to a minimum value of 1.0). (This option applies to \-\-rx mode only). .B \-l, \-\-limit max-confidence-search-limit Set receive confidence maximum search limit (default 2.3). The "confidence" value is as described above. This value acts as a performance vs. analysis quality control. Increase (up to INFINITY) for a more pedantic analysis and higher CPU usage. Decrease (down to the min-confidence-threshold) for a sloppier analysis, with lower CPU usage. (This option applies to \-\-rx mode only). .TP .B \-8, \-\-ascii ASCII 8\-N\-1 .TP .B \-5, \-\-baudot Baudot 5\-N\-1.5 .TP .B \-f, \-\-file filename.wav encode or decode an audio file (extension sets audio format) .TP .B \-b, \-\-bandwidth {rx_bandwidth} .TP .B \-v, \-\-volume {tx_amplitude or 'E'} Sets the generated signal amplitude (default is 1.0). As a special case useful for testing, the value 'E' sets the amplitude to the very small value FLT_EPSILON. (This option applies to \-\-tx mode only). .TP .B \-M, \-\-mark {mark_freq} .TP .B \-S, \-\-space {space_freq} .TP .B \-\-startbits {n} Sets the number of start bits (default is 1 for most baudmodes). .TP .B \-\-stopbits {n.n} Sets the number of stop bits (default is 1.0 for most baudmodes). .TP .B \-\-sync-byte {0xXX} If this option is used, initial carrier acquisition will be suppressed until after one or more consecutive data frame(s) containing this value are received. This can be used to synchronize the stream for protocols which include a fixed preamble byte. (This option applies to \-\-rx mode only). .TP .B \-q, \-\-quiet Do not report CARRIER / NOCARRIER or signal analysis metrics. .TP .B \-R, \-\-samplerate {rate} Set the audio sample rate (default rate is 48000 Hz). .TP .B \-A, \-\-alsa[={plughw:X,Y | X,Y | X }] Use ALSA as the audio output system instead of the default PulseAudio (depending on build configuration options). The ALSA device alias "default" is used, if a specific device is not specified. For example, the following options all select ALSA device #1, sub-device #0: \-\-alsa=plughw:1,0 \-\-alsa=1,0 \-A1 .TP .B \-\-lut={tx_sin_table_len} Minimodem uses a precomputed sine wave lookup table of 1024 elements, or the size specified here. Use \-\-lut=0 to disable the use of the sine wave lookup table. (This option applies to \-\-tx mode only). .TP .B \-\-float-samples Generate 32-bit floating-point format audio samples, instead of the default 16-bit signed integer format (applies to \-\-tx mode only; \-\-rx mode always uses 32-bit floating-point). .TP .B \-\-rx-one Quit after the first carrier/no-carrier event (applies to \-\-rx mode only). .TP .B \-\-binary-output Print received data bits as raw binary output using characters '0' and '1'. The bits are printed in the order they are received. Framing bits (start and stop bits) are omitted from the output. (This option applies to \-\-rx mode only). .TP .B \-\-binary-raw {nbits} Print all received bits (data bits and any framing bits) as raw binary output using characters '0' and '1'. Framing bits are not interpreted, but simply passed through to the output. The bits are printed in the order they are received, in lines {nbits} wide. So in order to display a standard 8-N-1 bitstream (8 databits + 1 start bit + 1 stop bit), use "--binary-raw 10" or a multiple of 10. (This option applies to \-\-rx mode only). .TP .B \-\-print-filter Filter the received text output, replacing any "non-printable" bytes with a '.' character. (This option applies to \-\-rx mode only). .TP .B \-\-tx-carrier When transmitting from a blocking source, keep a carrier going while waiting for more data. .TP .B \-\-benchmarks Run and report internal performance tests (all other flags are ignored). .TP .B \-V, \-\-version print program version .SH EXAMPLES .TP .B minimodem --tx 100 Transmit 100 baud tones from one computer ... .TP .B minimodem --rx 100 and receive 100 baud tones on another nearby computer. .TP .B minimodem --rx -a rtty Decode amateur radio RTTY signals (listen near 14.085 MHz). .TP .B minimodem --rx same Decode NOAA SAME protocol emergency alert transmissions, e.g. .br . .TP .B minimodem --tx 0.5 Experiment with very low baud rates (works in noisy conditions). .TP .B minimodem --tx 12000 Experiment with very high baud rates (works with audio files). .SH NOTES .B minimodem does not decode AX.25 framed packets. .PP .B minimodem does not support modem control ("AT") commands, nor does it produce DTMF telephone dialing tones. .SH VERSION This page documents .B minimodem version @PACKAGE_VERSION@. The latest version is available at . .SH AUTHOR .B minimodem was written by Kamal Mostafa . .SH COPYRIGHT Copyright \(co 2011-2016 by Kamal Mostafa . License GPLv3+: GNU GPL version 3 or later . .br This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. minimodem-0.23/src/databits_binary.c0000664000175000017500000000235012433467730014442 00000000000000/* * databits_binary.c * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "databits.h" /* * Rawbits N-bit binary data decoder/encoder */ #include // returns nbytes decoded unsigned int databits_decode_binary( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ) { if ( ! dataout_p ) // databits processor reset: noop return 0; assert( dataout_size >= n_databits + 1 ); int j; for ( j=0; j>j & 1) + '0'; dataout_p[j] = '\n'; return n_databits + 1; } minimodem-0.23/src/simpleaudio-benchmark.c0000664000175000017500000000602412234553650015544 00000000000000/* * simpleaudio-benchmark.c * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #if USE_BENCHMARKS #include #include #include #include #include #include "simpleaudio.h" #include "simpleaudio_internal.h" /* * benchmark backend for simpleaudio */ struct benchmark_data { struct timeval tv_start; unsigned long long total_nframes; }; static ssize_t sa_benchmark_dummy_readwrite( simpleaudio *sa, void *buf, size_t nframes ) { struct benchmark_data *d = sa->backend_handle; d->total_nframes += nframes; return nframes; } static void sa_benchmark_close( simpleaudio *sa ) { struct timeval tv_stop; gettimeofday(&tv_stop, NULL); struct benchmark_data *d = sa->backend_handle; unsigned long long runtime_usec, playtime_usec; runtime_usec = (tv_stop.tv_sec - d->tv_start.tv_sec) * 1000000; runtime_usec += tv_stop.tv_usec; runtime_usec -= d->tv_start.tv_usec; playtime_usec = d->total_nframes * 1000000 / sa->rate; unsigned long long performance = d->total_nframes * 1000000 / runtime_usec; fprintf(stdout, " frames count: \t%llu\n", d->total_nframes); fprintf(stdout, " audio playtime: \t%2llu.%06llu sec\n", playtime_usec/1000000, playtime_usec%1000000); fprintf(stdout, " elapsed runtime: \t%2llu.%06llu sec\n", runtime_usec/1000000, runtime_usec%1000000); fprintf(stdout, " performance: \t%llu samples/sec\n", performance); fflush(stdout); free(sa->backend_handle); } static int sa_benchmark_open_stream( simpleaudio *sa, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ) { struct benchmark_data *d = calloc(1, sizeof(struct benchmark_data)); if ( !d ) { perror("malloc"); return 0; } sa->backend_handle = d; sa->backend_framesize = sa->channels * sa->samplesize; fprintf(stdout, " %s\n", stream_name); fflush(stdout); gettimeofday(&d->tv_start, NULL); return 1; } const struct simpleaudio_backend simpleaudio_backend_benchmark = { sa_benchmark_open_stream, sa_benchmark_dummy_readwrite /* read */, sa_benchmark_dummy_readwrite /* write */, sa_benchmark_close, }; #endif /* USE_BENCHMARKS */ minimodem-0.23/src/databits_baudot.c0000664000175000017500000000224312433467730014435 00000000000000/* * databits_baudot.c * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "databits.h" /* * Baudot 5-bit data databits decoder/encoder */ #include "baudot.h" /* returns nbytes decoded */ unsigned int databits_decode_baudot( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ) { if ( ! dataout_p ) { // databits processor reset: reset Baudot state baudot_reset(); return 0; } bits &= 0x1F; return baudot_decode(dataout_p, bits); } minimodem-0.23/src/simpleaudio_internal.h0000644000175000017500000000367512274224637015530 00000000000000/* * simpleaudio_internal.h * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef SIMPLEAUDIO_INTERNAL_H #define SIMPLEAUDIO_INTERNAL_H #include "simpleaudio.h" struct simpleaudio_backend; typedef struct simpleaudio_backend simpleaudio_backend; struct simpleaudio { const struct simpleaudio_backend *backend; sa_format_t format; unsigned int rate; unsigned int channels; void * backend_handle; unsigned int samplesize; unsigned int backend_framesize; float rxnoise; // only for the sndfile backend }; struct simpleaudio_backend { int /* boolean 'ok' value */ (*simpleaudio_open_stream)( simpleaudio * sa, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ); ssize_t (*simpleaudio_read)( simpleaudio *sa, void *buf, size_t nframes ); ssize_t (*simpleaudio_write)( simpleaudio *sa, void *buf, size_t nframes ); void (*simpleaudio_close)( simpleaudio *sa ); }; extern const struct simpleaudio_backend simpleaudio_backend_benchmark; extern const struct simpleaudio_backend simpleaudio_backend_sndfile; extern const struct simpleaudio_backend simpleaudio_backend_alsa; extern const struct simpleaudio_backend simpleaudio_backend_pulseaudio; #endif minimodem-0.23/src/simpleaudio.h0000644000175000017500000000454312274224637013627 00000000000000/* * simpleaudio.h * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef SIMPLEAUDIO_H #define SIMPLEAUDIO_H #include struct simpleaudio; typedef struct simpleaudio simpleaudio; /* * simpleaudio_open_source_XXXX() routines which return a (simpleaudio *) * are provided by the separate backend modules. * */ /* sa_backend */ typedef enum { SA_BACKEND_SYSDEFAULT=0, SA_BACKEND_FILE, SA_BACKEND_BENCHMARK, SA_BACKEND_ALSA, SA_BACKEND_PULSEAUDIO, } sa_backend_t; /* sa_stream_direction */ typedef enum { SA_STREAM_PLAYBACK, SA_STREAM_RECORD, } sa_direction_t; /* sa_stream_format */ typedef enum { SA_SAMPLE_FORMAT_S16, SA_SAMPLE_FORMAT_FLOAT, } sa_format_t; simpleaudio * simpleaudio_open_stream( sa_backend_t sa_backend, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ); unsigned int simpleaudio_get_rate( simpleaudio *sa ); unsigned int simpleaudio_get_channels( simpleaudio *sa ); unsigned int simpleaudio_get_framesize( simpleaudio *sa ); sa_format_t simpleaudio_get_format( simpleaudio *sa ); unsigned int simpleaudio_get_samplesize( simpleaudio *sa ); void simpleaudio_set_rxnoise( simpleaudio *sa, float rxnoise_factor ); ssize_t simpleaudio_read( simpleaudio *sa, void *buf, size_t nframes ); ssize_t simpleaudio_write( simpleaudio *sa, void *buf, size_t nframes ); void simpleaudio_close( simpleaudio *sa ); /* * simpleaudio tone generator */ void simpleaudio_tone_reset(); void simpleaudio_tone(simpleaudio *sa_out, float tone_freq, size_t nsamples_dur); void simpleaudio_tone_init( unsigned int new_sin_table_len, float mag ); #endif minimodem-0.23/src/databits_callerid.c0000664000175000017500000001243012433467730014735 00000000000000/* * databits_callerid.c * * Copyright (C) 2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "databits.h" #include /* * Caller-ID (USA SDMF/MDMF) databits decoder * * Reference: http://melabs.com/resources/callerid.htm */ #define CID_MSG_MDMF 0x80 #define CID_MSG_SDMF 0x04 #define CID_DATA_DATETIME 0x01 #define CID_DATA_PHONE 0x02 #define CID_DATA_PHONE_NA 0x04 #define CID_DATA_NAME 0x07 #define CID_DATA_NAME_NA 0x08 static const char *cid_datatype_names[] = { "unknown0:", "Time:", "Phone:", "unknown3:", "Phone:", "unknown5:", "unknown6:", "Name:", "Name:" }; static int cid_msgtype = 0; static int cid_ndata = 0; static unsigned char cid_buf[256]; static unsigned int decode_mdmf_callerid( char *dataout_p, unsigned int dataout_size ) { unsigned int dataout_n = 0; unsigned int cid_i = 0; unsigned int cid_msglen = cid_buf[1]; unsigned char *m = cid_buf + 2; while ( cid_i < cid_msglen ) { unsigned int cid_datatype = *m++; if ( cid_datatype > CID_DATA_NAME_NA ) { // FIXME: bad datastream -- print something here return 0; } unsigned int cid_datalen = *m++; if ( m + 2 + cid_datalen >= cid_buf + sizeof(cid_buf) ) { // FIXME: bad datastream -- print something here return 0; } // dataout_n += sprintf(dataout_p+dataout_n, "CID: %d (%d)\n", cid_datatype, cid_datalen); dataout_n += sprintf(dataout_p+dataout_n, "%-6s ", cid_datatype_names[cid_datatype]); int prlen = 0; char *prdata = NULL; switch ( cid_datatype ) { case CID_DATA_DATETIME: dataout_n += sprintf(dataout_p+dataout_n, "%.2s/%.2s %.2s:%.2s\n", m+0, m+2, m+4, m+6); break; case CID_DATA_PHONE: if ( cid_datalen == 10 ) { dataout_n += sprintf(dataout_p+dataout_n, "%.3s-%.3s-%.4s\n", m+0, m+3, m+6); break; } else { // fallthrough } case CID_DATA_NAME: prdata = (char *)m; prlen = cid_datalen; break; case CID_DATA_PHONE_NA: case CID_DATA_NAME_NA: if ( cid_datalen == 1 && *m == 'O' ) { prdata = "[N/A]"; prlen = 5; } else if ( cid_datalen == 1 && *m == 'P' ) { prdata = "[blocked]"; prlen = 9; } break; default: // FIXME: warning here? break; } if ( prdata ) dataout_n += sprintf(dataout_p+dataout_n, "%.*s\n", prlen, prdata); m += cid_datalen; cid_i += cid_datalen + 2; } return dataout_n; } static unsigned int decode_sdmf_callerid( char *dataout_p, unsigned int dataout_size ) { unsigned int dataout_n = 0; unsigned int cid_msglen = cid_buf[1]; unsigned char *m = cid_buf + 2; dataout_n += sprintf(dataout_p+dataout_n, "%-6s ", cid_datatype_names[CID_DATA_DATETIME]); dataout_n += sprintf(dataout_p+dataout_n, "%.2s/%.2s %.2s:%.2s\n", m+0, m+2, m+4, m+6); m += 8; dataout_n += sprintf(dataout_p+dataout_n, "%-6s ", cid_datatype_names[CID_DATA_PHONE]); unsigned int cid_datalen = cid_msglen - 8; if ( cid_datalen == 10 ) dataout_n += sprintf(dataout_p+dataout_n, "%.3s-%.3s-%.4s\n", m+0, m+3, m+6); else dataout_n += sprintf(dataout_p+dataout_n, "%.*s\n", cid_datalen, m); return dataout_n; } static unsigned int decode_cid_reset() { cid_msgtype = 0; cid_ndata = 0; return 0; } // FIXME: doesn't respect dataout_size at all! /* returns nbytes decoded */ unsigned int databits_decode_callerid( char *dataout_p, unsigned int dataout_size, unsigned long long bits, unsigned int n_databits ) { if ( ! dataout_p ) // databits processor reset return decode_cid_reset(); if ( cid_msgtype == 0 ) { if ( bits == CID_MSG_MDMF ) cid_msgtype = CID_MSG_MDMF; else if ( bits == CID_MSG_SDMF ) cid_msgtype = CID_MSG_SDMF; else return 0; cid_buf[cid_ndata++] = bits; return 0; } if ( cid_ndata >= sizeof(cid_buf) ) { // FIXME? buffer overflow; do what here? return decode_cid_reset(); } cid_buf[cid_ndata++] = bits; // Collect input bytes until we've collected as many as the message // length byte says there will be, plus two (the message type byte // and the checksum byte) unsigned long long cid_msglen = cid_buf[1]; if ( cid_ndata < cid_msglen + 2) return 0; // Now we have a whole CID message in cid_buf[] -- decode it // FIXME: check the checksum unsigned int dataout_n = 0; dataout_n += sprintf(dataout_p+dataout_n, "CALLER-ID\n"); if ( cid_msgtype == CID_MSG_MDMF ) dataout_n += decode_mdmf_callerid(dataout_p+dataout_n, dataout_size-dataout_n); else dataout_n += decode_sdmf_callerid(dataout_p+dataout_n, dataout_size-dataout_n); // All done; reset for the next one decode_cid_reset(); return dataout_n; } minimodem-0.23/src/simpleaudio-pulse.c0000664000175000017500000000772612234553650014754 00000000000000/* * simpleaudio-pulse.c * * Copyright (C) 2011-2012 Kamal Mostafa * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #if USE_PULSEAUDIO #include #include #include #include #include #include #include "simpleaudio.h" #include "simpleaudio_internal.h" /* * pulseaudio[pa_simple] backend for simpleaudio */ static ssize_t sa_pulse_read( simpleaudio *sa, void *buf, size_t nframes ) { int error; pa_simple *s = (pa_simple *)sa->backend_handle; size_t nbytes = nframes * sa->backend_framesize; /* N.B. pa_simple_read always returns 0 or -1, not the number of * read bytes!*/ if (pa_simple_read(s, buf, nbytes, &error) < 0) { fprintf(stderr, "pa_simple_read: %s\n", pa_strerror(error)); return -1; } return nframes; } static ssize_t sa_pulse_write( simpleaudio *sa, void *buf, size_t nframes ) { int error; pa_simple *s = (pa_simple *)sa->backend_handle; size_t nbytes = nframes * sa->backend_framesize; /* ????? N.B. pa_simple_write always returns 0 or -1, not the number of * written bytes!*/ if (pa_simple_write(s, buf, nbytes, &error) < 0) { fprintf(stderr, "pa_simple_write: %s\n", pa_strerror(error)); return -1; } return nframes; } static void sa_pulse_close( simpleaudio *sa ) { pa_simple_drain(sa->backend_handle, NULL); pa_simple_free(sa->backend_handle); } static int sa_pulse_open_stream( simpleaudio *sa, const char *backend_device, sa_direction_t sa_stream_direction, sa_format_t sa_format, unsigned int rate, unsigned int channels, char *app_name, char *stream_name ) { int error; // FIXME - use source for something // just take the default pulseaudio source for now pa_sample_format_t pa_format; switch ( sa->format ) { case SA_SAMPLE_FORMAT_FLOAT: pa_format = PA_SAMPLE_FLOAT32; break; case SA_SAMPLE_FORMAT_S16: pa_format = PA_SAMPLE_S16LE; // FIXME: handle S16BE break; default: assert(0); } /* The sample type to use */ pa_sample_spec ss = { .format = pa_format, .rate = rate, .channels = channels, }; pa_buffer_attr attr = { .maxlength = (uint32_t)-1, .tlength = (uint32_t)-1, .prebuf = (uint32_t)-1, .minreq = (uint32_t)-1, .fragsize = (uint32_t)-1, }; attr.fragsize = 0; /* set for lowest possible capture latency */ attr.tlength = 0; /* set lowest possible playback latency */ // Do not mess with attr.prebuf! Setting it =1 causes some playback (--tx) // sessions to be wiped out by noise (I do not know why). /* Create the playback or recording stream */ pa_simple *s; s = pa_simple_new(NULL, app_name, sa_stream_direction == SA_STREAM_RECORD ? PA_STREAM_RECORD : PA_STREAM_PLAYBACK, NULL, stream_name, &ss, NULL, &attr, &error); if ( !s ) { fprintf(stderr, "E: Cannot create PulseAudio stream: %s\n ", pa_strerror(error)); return 0; } /* good or bad to override these? */ sa->rate = ss.rate; sa->channels = ss.channels; sa->backend_handle = s; sa->backend_framesize = pa_frame_size(&ss); return 1; } const struct simpleaudio_backend simpleaudio_backend_pulseaudio = { sa_pulse_open_stream, sa_pulse_read, sa_pulse_write, sa_pulse_close, }; #endif /* USE_PULSEAUDIO */ minimodem-0.23/configure.ac0000664000175000017500000000416712661701534012642 00000000000000AC_PREREQ([2.64]) AC_INIT([minimodem], [0.23], [kamal@whence.com]) AC_CONFIG_HEADERS([config.h]) AC_CONFIG_SRCDIR([src/Makefile.in]) AM_INIT_AUTOMAKE VERSION=AC_PACKAGE_VERSION AC_SUBST(VERSION) # Program Checks AC_PROG_CC # Library Checks AC_SEARCH_LIBS([lroundf], [m]) deps_packages="fftw3f" # ALSA AC_ARG_WITH([alsa], [AS_HELP_STRING([--without-alsa], [build without ALSA support])]) AS_IF([test "x$with_alsa" == "xno"], [ use_alsa=0 ], [ use_alsa=1 deps_packages="$deps_packages alsa" ]) AC_DEFINE_UNQUOTED([USE_ALSA], [$use_alsa], [Define to 1 to enable ALSA support]) # pulseaudio AC_ARG_WITH([pulseaudio], AS_HELP_STRING([--without-pulseaudio], [build without pulseaudio support])) AS_IF([test "x$with_pulseaudio" == "xno"], [ use_pulseaudio=0 ], [ use_pulseaudio=1 deps_packages="$deps_packages libpulse-simple" ]) AC_DEFINE_UNQUOTED([USE_PULSEAUDIO], [$use_pulseaudio], [Define to 1 to enable pulseaudio support]) # sndfile AC_ARG_WITH([sndfile], AS_HELP_STRING([--without-sndfile], [build without sndfile support])) AS_IF([test "x$with_sndfile" == "xno"], [ use_sndfile=0 ], [ use_sndfile=1 deps_packages="$deps_packages sndfile" ]) AC_DEFINE_UNQUOTED([USE_SNDFILE], [$use_sndfile], [Define to 1 to enable sndfile support]) # benchmarks AC_ARG_WITH([benchmarks], AS_HELP_STRING([--disable-benchmarks], [build without internal benchmarks])) AS_IF([test "x$with_benchmarks" == "xno"], [ use_benchmarks=0 ], [ use_benchmarks=1 ]) AC_DEFINE_UNQUOTED([USE_BENCHMARKS], [$use_benchmarks], [Define to 1 to enable internal benchmarks]) AC_MSG_RESULT([ option summary: alsa $with_alsa ($use_alsa) benchmarks $with_benchmarks ($use_benchmarks) pulseaudio $with_pulseaudio ($use_pulseaudio) sndfile $with_sndfile ($use_sndfile) ]) # Checks for libraries. PKG_CHECK_MODULES(DEPS, [$deps_packages]) AC_SUBST([auto_find_tests], ['$(sort $(wildcard *.test))']) AC_CONFIG_FILES([Makefile src/Makefile src/minimodem.1 tests/Makefile]) AC_OUTPUT minimodem-0.23/INSTALL0000664000175000017500000003633212036614523011401 00000000000000Installation Instructions ************************* Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without warranty of any kind. Basic Installation ================== Briefly, the shell commands `./configure; make; make install' should configure, build, and install this package. The following more-detailed instructions are generic; see the `README' file for instructions specific to this package. Some packages provide this `INSTALL' file but do not implement all of the features documented below. The lack of an optional feature in a given package is not necessarily a bug. More recommendations for GNU packages can be found in *note Makefile Conventions: (standards)Makefile Conventions. The `configure' shell script attempts to guess correct values for various system-dependent variables used during compilation. It uses those values to create a `Makefile' in each directory of the package. It may also create one or more `.h' files containing system-dependent definitions. Finally, it creates a shell script `config.status' that you can run in the future to recreate the current configuration, and a file `config.log' containing compiler output (useful mainly for debugging `configure'). It can also use an optional file (typically called `config.cache' and enabled with `--cache-file=config.cache' or simply `-C') that saves the results of its tests to speed up reconfiguring. 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Run `./configure --help' for details on some of the pertinent environment variables. You can give `configure' initial values for configuration parameters by setting variables in the command line or in the environment. Here is an example: ./configure CC=c99 CFLAGS=-g LIBS=-lposix *Note Defining Variables::, for more details. Compiling For Multiple Architectures ==================================== You can compile the package for more than one kind of computer at the same time, by placing the object files for each architecture in their own directory. To do this, you can use GNU `make'. `cd' to the directory where you want the object files and executables to go and run the `configure' script. `configure' automatically checks for the source code in the directory that `configure' is in and in `..'. This is known as a "VPATH" build. With a non-GNU `make', it is safer to compile the package for one architecture at a time in the source code directory. After you have installed the package for one architecture, use `make distclean' before reconfiguring for another architecture. On MacOS X 10.5 and later systems, you can create libraries and executables that work on multiple system types--known as "fat" or "universal" binaries--by specifying multiple `-arch' options to the compiler but only a single `-arch' option to the preprocessor. Like this: ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ CPP="gcc -E" CXXCPP="g++ -E" This is not guaranteed to produce working output in all cases, you may have to build one architecture at a time and combine the results using the `lipo' tool if you have problems. Installation Names ================== By default, `make install' installs the package's commands under `/usr/local/bin', include files under `/usr/local/include', etc. You can specify an installation prefix other than `/usr/local' by giving `configure' the option `--prefix=PREFIX', where PREFIX must be an absolute file name. You can specify separate installation prefixes for architecture-specific files and architecture-independent files. If you pass the option `--exec-prefix=PREFIX' to `configure', the package uses PREFIX as the prefix for installing programs and libraries. Documentation and other data files still use the regular prefix. In addition, if you use an unusual directory layout you can give options like `--bindir=DIR' to specify different values for particular kinds of files. Run `configure --help' for a list of the directories you can set and what kinds of files go in them. In general, the default for these options is expressed in terms of `${prefix}', so that specifying just `--prefix' will affect all of the other directory specifications that were not explicitly provided. The most portable way to affect installation locations is to pass the correct locations to `configure'; however, many packages provide one or both of the following shortcuts of passing variable assignments to the `make install' command line to change installation locations without having to reconfigure or recompile. The first method involves providing an override variable for each affected directory. For example, `make install prefix=/alternate/directory' will choose an alternate location for all directory configuration variables that were expressed in terms of `${prefix}'. Any directories that were specified during `configure', but not in terms of `${prefix}', must each be overridden at install time for the entire installation to be relocated. The approach of makefile variable overrides for each directory variable is required by the GNU Coding Standards, and ideally causes no recompilation. However, some platforms have known limitations with the semantics of shared libraries that end up requiring recompilation when using this method, particularly noticeable in packages that use GNU Libtool. The second method involves providing the `DESTDIR' variable. For example, `make install DESTDIR=/alternate/directory' will prepend `/alternate/directory' before all installation names. The approach of `DESTDIR' overrides is not required by the GNU Coding Standards, and does not work on platforms that have drive letters. On the other hand, it does better at avoiding recompilation issues, and works well even when some directory options were not specified in terms of `${prefix}' at `configure' time. Optional Features ================= If the package supports it, you can cause programs to be installed with an extra prefix or suffix on their names by giving `configure' the option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'. Some packages pay attention to `--enable-FEATURE' options to `configure', where FEATURE indicates an optional part of the package. They may also pay attention to `--with-PACKAGE' options, where PACKAGE is something like `gnu-as' or `x' (for the X Window System). The `README' should mention any `--enable-' and `--with-' options that the package recognizes. For packages that use the X Window System, `configure' can usually find the X include and library files automatically, but if it doesn't, you can use the `configure' options `--x-includes=DIR' and `--x-libraries=DIR' to specify their locations. Some packages offer the ability to configure how verbose the execution of `make' will be. For these packages, running `./configure --enable-silent-rules' sets the default to minimal output, which can be overridden with `make V=1'; while running `./configure --disable-silent-rules' sets the default to verbose, which can be overridden with `make V=0'. Particular systems ================== On HP-UX, the default C compiler is not ANSI C compatible. If GNU CC is not installed, it is recommended to use the following options in order to use an ANSI C compiler: ./configure CC="cc -Ae -D_XOPEN_SOURCE=500" and if that doesn't work, install pre-built binaries of GCC for HP-UX. On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot parse its `' header file. The option `-nodtk' can be used as a workaround. If GNU CC is not installed, it is therefore recommended to try ./configure CC="cc" and if that doesn't work, try ./configure CC="cc -nodtk" On Solaris, don't put `/usr/ucb' early in your `PATH'. This directory contains several dysfunctional programs; working variants of these programs are available in `/usr/bin'. So, if you need `/usr/ucb' in your `PATH', put it _after_ `/usr/bin'. On Haiku, software installed for all users goes in `/boot/common', not `/usr/local'. It is recommended to use the following options: ./configure --prefix=/boot/common Specifying the System Type ========================== There may be some features `configure' cannot figure out automatically, but needs to determine by the type of machine the package will run on. Usually, assuming the package is built to be run on the _same_ architectures, `configure' can figure that out, but if it prints a message saying it cannot guess the machine type, give it the `--build=TYPE' option. TYPE can either be a short name for the system type, such as `sun4', or a canonical name which has the form: CPU-COMPANY-SYSTEM where SYSTEM can have one of these forms: OS KERNEL-OS See the file `config.sub' for the possible values of each field. If `config.sub' isn't included in this package, then this package doesn't need to know the machine type. If you are _building_ compiler tools for cross-compiling, you should use the option `--target=TYPE' to select the type of system they will produce code for. If you want to _use_ a cross compiler, that generates code for a platform different from the build platform, you should specify the "host" platform (i.e., that on which the generated programs will eventually be run) with `--host=TYPE'. Sharing Defaults ================ If you want to set default values for `configure' scripts to share, you can create a site shell script called `config.site' that gives default values for variables like `CC', `cache_file', and `prefix'. `configure' looks for `PREFIX/share/config.site' if it exists, then `PREFIX/etc/config.site' if it exists. Or, you can set the `CONFIG_SITE' environment variable to the location of the site script. A warning: not all `configure' scripts look for a site script. Defining Variables ================== Variables not defined in a site shell script can be set in the environment passed to `configure'. However, some packages may run configure again during the build, and the customized values of these variables may be lost. In order to avoid this problem, you should set them in the `configure' command line, using `VAR=value'. For example: ./configure CC=/usr/local2/bin/gcc causes the specified `gcc' to be used as the C compiler (unless it is overridden in the site shell script). Unfortunately, this technique does not work for `CONFIG_SHELL' due to an Autoconf bug. Until the bug is fixed you can use this workaround: CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash `configure' Invocation ====================== `configure' recognizes the following options to control how it operates. `--help' `-h' Print a summary of all of the options to `configure', and exit. `--help=short' `--help=recursive' Print a summary of the options unique to this package's `configure', and exit. The `short' variant lists options used only in the top level, while the `recursive' variant lists options also present in any nested packages. `--version' `-V' Print the version of Autoconf used to generate the `configure' script, and exit. `--cache-file=FILE' Enable the cache: use and save the results of the tests in FILE, traditionally `config.cache'. FILE defaults to `/dev/null' to disable caching. `--config-cache' `-C' Alias for `--cache-file=config.cache'. `--quiet' `--silent' `-q' Do not print messages saying which checks are being made. To suppress all normal output, redirect it to `/dev/null' (any error messages will still be shown). `--srcdir=DIR' Look for the package's source code in directory DIR. Usually `configure' can determine that directory automatically. `--prefix=DIR' Use DIR as the installation prefix. *note Installation Names:: for more details, including other options available for fine-tuning the installation locations. `--no-create' `-n' Run the configure checks, but stop before creating any output files. `configure' also accepts some other, not widely useful, options. Run `configure --help' for more details. minimodem-0.23/install-sh0000755000175000017500000003546312661703417012363 00000000000000#!/bin/sh # install - install a program, script, or datafile scriptversion=2014-09-12.12; # UTC # This originates from X11R5 (mit/util/scripts/install.sh), which was # later released in X11R6 (xc/config/util/install.sh) with the # following copyright and license. # # Copyright (C) 1994 X Consortium # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to # deal in the Software without restriction, including without limitation the # rights to use, copy, modify, merge, publish, distribute, sublicense, and/or # sell copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC- # TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # Except as contained in this notice, the name of the X Consortium shall not # be used in advertising or otherwise to promote the sale, use or other deal- # ings in this Software without prior written authorization from the X Consor- # tium. # # # FSF changes to this file are in the public domain. # # Calling this script install-sh is preferred over install.sh, to prevent # 'make' implicit rules from creating a file called install from it # when there is no Makefile. # # This script is compatible with the BSD install script, but was written # from scratch. tab=' ' nl=' ' IFS=" $tab$nl" # Set DOITPROG to "echo" to test this script. doit=${DOITPROG-} doit_exec=${doit:-exec} # Put in absolute file names if you don't have them in your path; # or use environment vars. chgrpprog=${CHGRPPROG-chgrp} chmodprog=${CHMODPROG-chmod} chownprog=${CHOWNPROG-chown} cmpprog=${CMPPROG-cmp} cpprog=${CPPROG-cp} mkdirprog=${MKDIRPROG-mkdir} mvprog=${MVPROG-mv} rmprog=${RMPROG-rm} stripprog=${STRIPPROG-strip} posix_mkdir= # Desired mode of installed file. mode=0755 chgrpcmd= chmodcmd=$chmodprog chowncmd= mvcmd=$mvprog rmcmd="$rmprog -f" stripcmd= src= dst= dir_arg= dst_arg= copy_on_change=false is_target_a_directory=possibly usage="\ Usage: $0 [OPTION]... [-T] SRCFILE DSTFILE or: $0 [OPTION]... SRCFILES... DIRECTORY or: $0 [OPTION]... -t DIRECTORY SRCFILES... or: $0 [OPTION]... -d DIRECTORIES... In the 1st form, copy SRCFILE to DSTFILE. In the 2nd and 3rd, copy all SRCFILES to DIRECTORY. In the 4th, create DIRECTORIES. Options: --help display this help and exit. --version display version info and exit. -c (ignored) -C install only if different (preserve the last data modification time) -d create directories instead of installing files. -g GROUP $chgrpprog installed files to GROUP. -m MODE $chmodprog installed files to MODE. -o USER $chownprog installed files to USER. -s $stripprog installed files. -t DIRECTORY install into DIRECTORY. -T report an error if DSTFILE is a directory. Environment variables override the default commands: CHGRPPROG CHMODPROG CHOWNPROG CMPPROG CPPROG MKDIRPROG MVPROG RMPROG STRIPPROG " while test $# -ne 0; do case $1 in -c) ;; -C) copy_on_change=true;; -d) dir_arg=true;; -g) chgrpcmd="$chgrpprog $2" shift;; --help) echo "$usage"; exit $?;; -m) mode=$2 case $mode in *' '* | *"$tab"* | *"$nl"* | *'*'* | *'?'* | *'['*) echo "$0: invalid mode: $mode" >&2 exit 1;; esac shift;; -o) chowncmd="$chownprog $2" shift;; -s) stripcmd=$stripprog;; -t) is_target_a_directory=always dst_arg=$2 # Protect names problematic for 'test' and other utilities. case $dst_arg in -* | [=\(\)!]) dst_arg=./$dst_arg;; esac shift;; -T) is_target_a_directory=never;; --version) echo "$0 $scriptversion"; exit $?;; --) shift break;; -*) echo "$0: invalid option: $1" >&2 exit 1;; *) break;; esac shift done # We allow the use of options -d and -T together, by making -d # take the precedence; this is for compatibility with GNU install. if test -n "$dir_arg"; then if test -n "$dst_arg"; then echo "$0: target directory not allowed when installing a directory." >&2 exit 1 fi fi if test $# -ne 0 && test -z "$dir_arg$dst_arg"; then # When -d is used, all remaining arguments are directories to create. # When -t is used, the destination is already specified. # Otherwise, the last argument is the destination. 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Create the # directory the slow way, step by step, checking for races as we go. case $dstdir in /*) prefix='/';; [-=\(\)!]*) prefix='./';; *) prefix='';; esac oIFS=$IFS IFS=/ set -f set fnord $dstdir shift set +f IFS=$oIFS prefixes= for d do test X"$d" = X && continue prefix=$prefix$d if test -d "$prefix"; then prefixes= else if $posix_mkdir; then (umask=$mkdir_umask && $doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir") && break # Don't fail if two instances are running concurrently. test -d "$prefix" || exit 1 else case $prefix in *\'*) qprefix=`echo "$prefix" | sed "s/'/'\\\\\\\\''/g"`;; *) qprefix=$prefix;; esac prefixes="$prefixes '$qprefix'" fi fi prefix=$prefix/ done if test -n "$prefixes"; then # Don't fail if two instances are running concurrently. (umask $mkdir_umask && eval "\$doit_exec \$mkdirprog $prefixes") || test -d "$dstdir" || exit 1 obsolete_mkdir_used=true fi fi fi if test -n "$dir_arg"; then { test -z "$chowncmd" || $doit $chowncmd "$dst"; } && { test -z "$chgrpcmd" || $doit $chgrpcmd "$dst"; } && { test "$obsolete_mkdir_used$chowncmd$chgrpcmd" = false || test -z "$chmodcmd" || $doit $chmodcmd $mode "$dst"; } || exit 1 else # Make a couple of temp file names in the proper directory. dsttmp=$dstdir/_inst.$$_ rmtmp=$dstdir/_rm.$$_ # Trap to clean up those temp files at exit. trap 'ret=$?; rm -f "$dsttmp" "$rmtmp" && exit $ret' 0 # Copy the file name to the temp name. (umask $cp_umask && $doit_exec $cpprog "$src" "$dsttmp") && # and set any options; do chmod last to preserve setuid bits. # # If any of these fail, we abort the whole thing. If we want to # ignore errors from any of these, just make sure not to ignore # errors from the above "$doit $cpprog $src $dsttmp" command. # { test -z "$chowncmd" || $doit $chowncmd "$dsttmp"; } && { test -z "$chgrpcmd" || $doit $chgrpcmd "$dsttmp"; } && { test -z "$stripcmd" || $doit $stripcmd "$dsttmp"; } && { test -z "$chmodcmd" || $doit $chmodcmd $mode "$dsttmp"; } && # If -C, don't bother to copy if it wouldn't change the file. if $copy_on_change && old=`LC_ALL=C ls -dlL "$dst" 2>/dev/null` && new=`LC_ALL=C ls -dlL "$dsttmp" 2>/dev/null` && set -f && set X $old && old=:$2:$4:$5:$6 && set X $new && new=:$2:$4:$5:$6 && set +f && test "$old" = "$new" && $cmpprog "$dst" "$dsttmp" >/dev/null 2>&1 then rm -f "$dsttmp" else # Rename the file to the real destination. $doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null || # The rename failed, perhaps because mv can't rename something else # to itself, or perhaps because mv is so ancient that it does not # support -f. { # Now remove or move aside any old file at destination location. # We try this two ways since rm can't unlink itself on some # systems and the destination file might be busy for other # reasons. In this case, the final cleanup might fail but the new # file should still install successfully. { test ! -f "$dst" || $doit $rmcmd -f "$dst" 2>/dev/null || { $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null && { $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; } } || { echo "$0: cannot unlink or rename $dst" >&2 (exit 1); exit 1 } } && # Now rename the file to the real destination. $doit $mvcmd "$dsttmp" "$dst" } fi || exit 1 trap '' 0 fi done # Local variables: # eval: (add-hook 'write-file-hooks 'time-stamp) # time-stamp-start: "scriptversion=" # time-stamp-format: "%:y-%02m-%02d.%02H" # time-stamp-time-zone: "UTC" # time-stamp-end: "; # UTC" # End: minimodem-0.23/COPYING0000664000175000017500000010072612661674706011417 00000000000000minimodem - software audio Bell-type or RTTY FSK modem Copyright (C) 2011-2016 Kamal Mostafa This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . ------------------------------------------------------------------------ GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. 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END OF TERMS AND CONDITIONS minimodem-0.23/compile0000755000175000017500000001624512661703417011732 00000000000000#! /bin/sh # Wrapper for compilers which do not understand '-c -o'. scriptversion=2012-10-14.11; # UTC # Copyright (C) 1999-2014 Free Software Foundation, Inc. # Written by Tom Tromey . # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # This file is maintained in Automake, please report # bugs to or send patches to # . nl=' ' # We need space, tab and new line, in precisely that order. Quoting is # there to prevent tools from complaining about whitespace usage. IFS=" "" $nl" file_conv= # func_file_conv build_file lazy # Convert a $build file to $host form and store it in $file # Currently only supports Windows hosts. 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He has used minimodem to debug suspend/resume issues, representing its first practical application: http://smackerelofopinion.blogspot.com/2011/08/debugging-s3-suspendresume-using.html Thanks, Colin! Elektra provided encouragement and extensive help with making minimodem work on an OpenWRT router, including testing the ALSA back-end and runtime performance improvements for non-FPU systems. Elektra demonstrates and discusses minimodem on the German Freifunk radio show: http://wiki.freifunk.net/Freifunk.radio_20120814 Thanks, Elektra! Chris Van Hoof provided encouragement, testing help, and hardware relating to the S.A.M.E. protocol. Thanks Chris! Mike Tedesco provided encouragement and testing for the Caller-ID protocol handling, and portability fixes for OS X. Thanks Mike! My employer Canonical, Ltd. for encouraging me to spend time developing and maintaining this and other open-source projects. Thanks, Canonical! Dr. Steven W. Smith, for providing his incredible book "The Scientist and Engineer's Guide to Digital Signal Processing" free of charge online at http://www.dspguide.com/ Thanks, Dr. Smith! minimodem-0.23/test-driver0000755000175000017500000001104012661703417012536 00000000000000#! /bin/sh # test-driver - basic testsuite driver script. scriptversion=2013-07-13.22; # UTC # Copyright (C) 2011-2014 Free Software Foundation, Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # This file is maintained in Automake, please report # bugs to or send patches to # . # Make unconditional expansion of undefined variables an error. This # helps a lot in preventing typo-related bugs. set -u usage_error () { echo "$0: $*" >&2 print_usage >&2 exit 2 } print_usage () { cat <$log_file 2>&1 estatus=$? if test $enable_hard_errors = no && test $estatus -eq 99; then tweaked_estatus=1 else tweaked_estatus=$estatus fi case $tweaked_estatus:$expect_failure in 0:yes) col=$red res=XPASS recheck=yes gcopy=yes;; 0:*) col=$grn res=PASS recheck=no gcopy=no;; 77:*) col=$blu res=SKIP recheck=no gcopy=yes;; 99:*) col=$mgn res=ERROR recheck=yes gcopy=yes;; *:yes) col=$lgn res=XFAIL recheck=no gcopy=yes;; *:*) col=$red res=FAIL recheck=yes gcopy=yes;; esac # Report the test outcome and exit status in the logs, so that one can # know whether the test passed or failed simply by looking at the '.log' # file, without the need of also peaking into the corresponding '.trs' # file (automake bug#11814). echo "$res $test_name (exit status: $estatus)" >>$log_file # Report outcome to console. echo "${col}${res}${std}: $test_name" # Register the test result, and other relevant metadata. echo ":test-result: $res" > $trs_file echo ":global-test-result: $res" >> $trs_file echo ":recheck: $recheck" >> $trs_file echo ":copy-in-global-log: $gcopy" >> $trs_file # Local Variables: # mode: shell-script # sh-indentation: 2 # eval: (add-hook 'write-file-hooks 'time-stamp) # time-stamp-start: "scriptversion=" # time-stamp-format: "%:y-%02m-%02d.%02H" # time-stamp-time-zone: "UTC" # time-stamp-end: "; # UTC" # End: minimodem-0.23/NEWS0000664000175000017500000000000012036614523011026 00000000000000minimodem-0.23/AUTHORS0000664000175000017500000000023612516032613011407 00000000000000Kamal Mostafa Marcos Vives Del Sol [ UIC-751-3 mode ] Nick Moriarty [ --tx-carrier feature ] minimodem-0.23/ChangeLog0000664000175000017500000000000012036614523012101 00000000000000