minimodem-0.19/0000775000175000017500000000000012216351220010416 500000000000000minimodem-0.19/Makefile.am0000664000175000017500000000002412037400725012374 00000000000000SUBDIRS = src tests minimodem-0.19/depcomp0000775000175000017500000004426712036614523011740 00000000000000#! /bin/sh # depcomp - compile a program generating dependencies as side-effects scriptversion=2009-04-28.21; # UTC # Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2009 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 outputing dependencies. libtool Whether libtool is used (yes/no). Report bugs to . EOF exit $? ;; -v | --v*) echo "depcomp $scriptversion" exit $? ;; esac if test -z "$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" # 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. 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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-0.19/README0000664000175000017500000000135512155373530011234 00000000000000minimodem - general-purpose software audio FSK modem Copyright (C) 2011-2013 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, 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. 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Generated from configure.ac by autoheader. */ /* Define to 1 if you have the `m' library (-lm). */ #undef HAVE_LIBM /* 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-0.19/tests/0000775000175000017500000000000012216351221011561 500000000000000minimodem-0.19/tests/test-71-callerid-sdmf0000775000175000017500000000010612036617132015342 00000000000000#!/bin/bash exec ./test-70-callerid-mdmf testdata-callerid-sdmf.bytes minimodem-0.19/tests/Makefile.am0000664000175000017500000000145312036617132013546 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 = test-* minimodem-0.19/tests/test-08-self-test-lut160000775000175000017500000000006212036617132015514 00000000000000exec ./self-test testdata-ascii.txt 1200 --lut=16 minimodem-0.19/tests/test-40-noise0000775000175000017500000000073012036617132013750 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-0.19/tests/test-21-rate-slop0000775000175000017500000000073012036617132014540 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 $fail minimodem-0.19/tests/testdata-ascii.txt0000664000175000017500000000362112036617132015151 00000000000000This is a minimodem ascii data test file. http://www.whence.com/minimodem/ THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG the quick brown fox jumps over the lazy dog 1234567890 !@#$%^&*()-=_+`~[]\;',./{}|:"<>? tab> Aluminum tube Three hundred twenty sardines Earning our SkyMiles ---------------------------------------------------------------------------- minimodem - software audio Bell-type or RTTY FSK modem Copyright (C) 2011-2012 Kamal Mostafa Minimodem is a command-line program which generates (or decodes) audio modem tones at any specified baud rate, emulating an old Bell-type or radio-teletype FSK modem. The tones can be played to (or recorded from) the system audio (PulseAudio or ALSA) or to an audio file. 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 - software audio Bell-type or RTTY FSK modem 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. 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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-0.19/tests/testdata-callerid-sdmf.bytes0000664000175000017500000000002512036617132017071 00000000000000093012246095551212Qminimodem-0.19/tests/test-30-amplitude0000775000175000017500000000064012036617132014616 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 $fail minimodem-0.19/tests/test-11-verify-perfect-nolut0000775000175000017500000000013212036617132016716 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=0 minimodem-0.19/tests/testdata-callerid-mdmf.txt0000664000175000017500000000010112036617132016547 00000000000000CALLER-ID Time: 03/24 09:02 Name: JOHN DOE Phone: 800-555-1212 minimodem-0.19/tests/testdata-callerid-sdmf.txt0000664000175000017500000000006112036617132016562 00000000000000CALLER-ID Time: 09/30 12:24 Phone: 609-555-1212 minimodem-0.19/tests/test-70-callerid-mdmf0000775000175000017500000000156712036617132015347 00000000000000#!/bin/bash MINIMODEM="${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-$$" trap "rm -f $TMPF.*" 0 set -e textfile="${bytesfile%%.bytes}.txt" minimodem_tx_args="1200 --ascii" minimodem_rx_args="callerid" $MINIMODEM --tx --file $TMPF.wav $minimodem_tx_args < "$bytesfile" # cp $TMPF.wav /tmp/x.wav $MINIMODEM --rx --file $TMPF.wav $minimodem_rx_args \ > $TMPF.out 2> $TMPF.err || { cat $TMPF.err exit 1 } cmp "$textfile" $TMPF.out { read xlitcarrier read xlitblankline read xlithashes xlitnocarrier stats stats="${stats% ###}" } < $TMPF.err result="OK " exitcode=0 echo -e "$result $stats" exit $exitcode minimodem-0.19/tests/test-12-verify-perfect-lut160000775000175000017500000000013312036617132016532 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=16 minimodem-0.19/tests/test-04-self-test-0.50000775000175000017500000000015012036617132015035 00000000000000#!/bin/bash TMPF=/tmp/minimodem-test.$$ trap "rm -f $TMPF" 0 echo "KAMAL" > $TMPF ./self-test $TMPF 0.5 minimodem-0.19/tests/test-10-verify-perfect0000775000175000017500000000023412036617132015561 00000000000000# test for confidence=1.00 when using exact integer multiple frequencies exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 minimodem-0.19/tests/self-test0000775000175000017500000000266512036617132013354 00000000000000#!/bin/bash MINIMODEM="${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-0.19/tests/test-06-self-test-float-samples0000775000175000017500000000007212036617132017307 00000000000000exec ./self-test testdata-ascii.txt --float-samples 12000 minimodem-0.19/tests/test-01-self-test-12000000775000175000017500000000005112036617132015112 00000000000000exec ./self-test testdata-ascii.txt 1200 minimodem-0.19/tests/test-80-SAME0000775000175000017500000000005112155373311013360 00000000000000exec ./self-test testdata-ascii.txt SAME minimodem-0.19/tests/testdata-multibyte.txt0000664000175000017500000000027312036617132016077 00000000000000Minimodem unterstützt jetzt Deutsch! Beachten sie, dass wörter mit multibyte-zeichen korrekt gedruckt werden. Minimodem ahora soporta Español! Minimodem prend désormais en Français! minimodem-0.19/tests/test-31-amplitude-float0000775000175000017500000000005512036617132015722 00000000000000#!/bin/bash exec ./test-30-amplitude --float minimodem-0.19/tests/test-13-verify-perfect-nolut-float0000775000175000017500000000015212036617132020025 00000000000000exec ./self-test -P testdata-ascii.txt \ 1200 --samplerate 24000 -M 1200 -S 2400 --lut=0 --float-samples minimodem-0.19/tests/test-02-self-test-3000000775000175000017500000000005012036617132015032 00000000000000exec ./self-test testdata-ascii.txt 300 minimodem-0.19/tests/testdata-callerid-mdmf.bytes0000664000175000017500000000004312036617132017063 00000000000000€ 03240902JOHN DOE 8005551212}minimodem-0.19/tests/test-60-multibyte0000775000175000017500000000005512036617132014653 00000000000000exec ./self-test testdata-multibyte.txt 1200 minimodem-0.19/tests/test-03-self-test-rtty0000775000175000017500000000014212036617132015535 00000000000000# use testdata-ascii-baudot.txt as the sample text file exec ./self-test testdata-baudot.txt rtty minimodem-0.19/tests/test-81-ascii70000775000175000017500000000005412216066246014022 00000000000000exec ./self-test testdata-ascii.txt -7 1200 minimodem-0.19/Makefile.in0000664000175000017500000005472412216350355012427 00000000000000# Makefile.in generated by automake 1.11.6 from Makefile.am. # @configure_input@ # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, # 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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__make_dryrun = \ { \ am__dry=no; \ case $$MAKEFLAGS in \ *\\[\ \ ]*) \ echo 'am--echo: ; @echo "AM" OK' | $(MAKE) -f - 2>/dev/null \ | grep '^AM OK$$' >/dev/null || am__dry=yes;; \ *) \ for am__flg in $$MAKEFLAGS; do \ case $$am__flg in \ *=*|--*) ;; \ *n*) am__dry=yes; break;; \ esac; \ done;; \ esac; \ test $$am__dry = yes; \ } 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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You may also peek at any GNU archive site, in case some other package would contain this missing \`$1' program." exit 1 ;; esac exit 0 # 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-0.19/src/0000775000175000017500000000000012216351220011205 500000000000000minimodem-0.19/src/Makefile.am0000664000175000017500000000277312036617132013201 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 . # AM_CFLAGS = -Wall # -Werror INCLUDES = $(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 DATABITS_SRC = \ databits.h \ databits_ascii.c \ databits_binary.c \ databits_callerid.c \ databits_baudot.c $(BAUDOT_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-0.19/src/minimodem.c0000664000175000017500000010640512216065713013266 00000000000000/* * minimodem.c * * minimodem - software audio Bell-type or RTTY FSK modem * * Copyright (C) 2011-2013 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 #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, bfsk_space_f, bit_nsamples * bfsk_nstartbits); // start for ( i=0; i> 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, 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, unsigned int bfsk_do_tx_sync_bytes, unsigned int bfsk_sync_byte, databits_encoder encode ) { size_t sample_rate = simpleaudio_get_rate(sa_out); size_t bit_nsamples = sample_rate / data_rate + 0.5; int c; 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*0.03) } // it_value }; struct itimerval itv_zero = { {0, 0}, // it_interval {0, 0} // it_value }; if ( tx_interactive ) signal(SIGALRM, tx_stop_transmit_sighandler); tx_transmitting = 0; while ( (c = getchar()) != EOF ) { if ( tx_interactive ) setitimer(ITIMER_REAL, &itv_zero, NULL); // fprintf(stderr, "", c); unsigned int nwords; unsigned int bits[2]; unsigned int j; nwords = encode(bits, c); 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" " --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" " --print-filter\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" " same NOAA SAME 520.83 bps --sync-byte=0xAB ...\n" " callerid Bell202 CID 1200 bps\n" ); exit(1); } 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; unsigned int bfsk_mark_f = 0; unsigned int 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 int bfsk_sync_byte = -1; unsigned int bfsk_n_data_bits = 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 output_mode_binary = 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_STARTBITS, MINIMODEM_OPT_STOPBITS, MINIMODEM_OPT_SYNC_BYTE, MINIMODEM_OPT_LUT, MINIMODEM_OPT_FLOAT_SAMPLES, MINIMODEM_OPT_RX_ONE, MINIMODEM_OPT_BENCHMARKS, MINIMODEM_OPT_BINARY_OUTPUT, MINIMODEM_OPT_PRINT_FILTER, MINIMODEM_OPT_XRXNOISE, }; 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' }, { "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 }, { "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 }, { "print-filter", 0, 0, MINIMODEM_OPT_PRINT_FILTER }, { "Xrxnoise", 1, 0, MINIMODEM_OPT_XRXNOISE }, { 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 '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 > 0.0 ); break; case 'M': bfsk_mark_f = atoi(optarg); assert( bfsk_mark_f > 0 ); break; case 'S': bfsk_space_f = atoi(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_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_PRINT_FILTER: output_print_filter = 1; break; case MINIMODEM_OPT_XRXNOISE: rxnoise_factor = atof(optarg); 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, "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; } bfsk_databits_decode = databits_decode_callerid; bfsk_data_rate = 1200; bfsk_n_data_bits = 8; } else { bfsk_data_rate = atof(modem_mode); if ( bfsk_n_data_bits == 0 ) bfsk_n_data_bits = 8; } if ( bfsk_data_rate == 0.0 ) usage(); if ( output_mode_binary ) bfsk_databits_decode = databits_decode_binary; 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, bfsk_do_tx_sync_bytes, bfsk_sync_byte, bfsk_databits_encode ); 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 != 0.0 ) 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 >= 0.0 && fsk_frame_overscan < 1.0 ); // ensure that we overscan at least a single sample unsigned int nsamples_overscan = nsamples_per_bit * fsk_frame_overscan + 0.5; if ( fsk_frame_overscan > 0.0 && 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 + 0.5; 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 > 0.0 && 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/2.0) / 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"); // 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 expect_bits_string[32]; int j = 0; if ( bfsk_nstopbits != 0.0 ) expect_bits_string[j++] = '1'; 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 != 0.0 ) expect_bits_string[j++] = '1'; expect_bits_string[j++] = 0; unsigned int expect_n_bits = strlen(expect_bits_string); unsigned int expect_nsamples = nsamples_per_bit * expect_n_bits; // fprintf(stderr, "ebs = '%s' (%lu) ; expect_nsamples=%u samples_nvalid=%lu\n", expect_bits_string, strlen(expect_bits_string), expect_nsamples, samples_nvalid); 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 * 0.75 + 0.5; 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 int 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, expect_bits_string, &bits, &litude, &frame_start_sample ); int do_refine_frame = 0; if ( confidence < peak_confidence * 0.75 ) { 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 * 0.25 ) { 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 + 0.5), fskp->b_mark * fskp->band_width); else fprintf(stderr, "### CARRIER %.2f @ %.1f Hz ", bfsk_data_rate, 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 int 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, expect_bits_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 != 0.0 ) 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 unsigned int frame_bits_shift = bfsk_nstartbits; unsigned int frame_bits_mask = (int)(1<> frame_bits_shift ) & frame_bits_mask; 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 */ 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-0.19/src/simpleaudio-alsa.c0000664000175000017500000001164512036617132014540 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) */, (unsigned int)-1 /* latency (allow max to avoid underruns) */); 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-0.19/src/databits.h0000664000175000017500000000337312036617132013106 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 . */ typedef int (databits_encoder)( unsigned int *databits_outp, char char_out ); typedef unsigned int (databits_decoder)( char *dataout_p, unsigned int dataout_size, unsigned int 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 int 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 int 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 int bits, unsigned int n_databits ); unsigned int databits_decode_callerid( char *dataout_p, unsigned int dataout_size, unsigned int bits, unsigned int n_databits ); minimodem-0.19/src/fsk.h0000664000175000017500000000403712122401530012061 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 int *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-0.19/src/baudot.c0000664000175000017500000002003612036617132012557 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-0.19/src/minimodem.10000664000175000017500000001665512216351210013201 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, 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 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 .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 \-\-print-filter Filter the received text output, replacing any "non-printable" bytes with a '.' character. (This option applies to \-\-rx mode only). .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 http://en.wikipedia.org/wiki/Specific_Area_Message_Encoding .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 0.19. The latest version is available at . .SH AUTHOR .B minimodem was written by Kamal Mostafa . .SH COPYRIGHT Copyright \(co 2011-2013 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-0.19/src/baudot.h0000664000175000017500000000221112036617057012565 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-0.19/src/fsk.c0000664000175000017500000004107412045276553012101 00000000000000/* * fsk.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 #include #include // fabs, 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 / 2.0; 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 = 2.0 / (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 int *bits_outp, float *ampl_outp ) { unsigned int bit_nsamples = (float)(samples_per_bit + 0.5); unsigned int bit_values[32]; float bit_sig_mags[32]; float bit_noise_mags[32]; 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]; } // 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; #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 int 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 = 1.0 / ((float)nsamples/2.0); 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-0.19/src/simpleaudio.c0000664000175000017500000000753412036617132013624 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 ( 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-0.19/src/Makefile.in0000664000175000017500000005246212216350355013213 00000000000000# Makefile.in generated by automake 1.11.6 from Makefile.am. # @configure_input@ # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, # 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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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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-0.19/src/simpleaudio-sndfile.c0000664000175000017500000001163612036617132015244 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 != 0.0 ) { 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-0.19/src/simple-tone-generator.c0000664000175000017500000001032412036617132015520 00000000000000/* * simple-tone-generator.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 #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 = 32767.0 * 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-0.19/src/databits_ascii.c0000664000175000017500000000243412036617132014246 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 int bits, unsigned int n_databits ) { if ( ! dataout_p ) // databits processor reset: noop return 0; bits &= 0xFF; *dataout_p = bits; return 1; } minimodem-0.19/src/minimodem.1.html0000664000175000017500000003055612216351220014141 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, 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

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

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).

−−print-filter

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

−−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 0.19. The latest version is available at <http://www.whence.com/minimodem>.

AUTHOR

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

COPYRIGHT

Copyright © 2011-2013 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-0.19/src/minimodem.1.in0000664000175000017500000001667212155377132013622 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, 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 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 .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 \-\-print-filter Filter the received text output, replacing any "non-printable" bytes with a '.' character. (This option applies to \-\-rx mode only). .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 http://en.wikipedia.org/wiki/Specific_Area_Message_Encoding .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 2011-2013 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-0.19/src/databits_binary.c0000664000175000017500000000234212036617132014440 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 int 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-0.19/src/simpleaudio-benchmark.c0000664000175000017500000000602412036617132015545 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-0.19/src/databits_baudot.c0000664000175000017500000000223512036617132014433 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 int 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-0.19/src/simpleaudio_internal.h0000664000175000017500000000367512036617132015527 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-0.19/src/simpleaudio.h0000664000175000017500000000454312036617132013626 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-0.19/src/databits_callerid.c0000664000175000017500000001145512037401412014731 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]); if ( cid_datatype == CID_DATA_DATETIME ) dataout_n += sprintf(dataout_p+dataout_n, "%.2s/%.2s %.2s:%.2s\n", m+0, m+2, m+4, m+6); else if ( cid_datatype == CID_DATA_PHONE && 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); 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 int 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 int 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-0.19/src/simpleaudio-pulse.c0000664000175000017500000000772612036617132014755 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-0.19/configure.ac0000664000175000017500000000526212216347750012646 00000000000000dnl dnl configure.ac Generated by project-setup dnl AC_DEFUN([PKG_NAME], [minimodem]) AC_DEFUN([PKG_VERSION], [0.19]) AC_DEFUN([PKG_AUTHOR], [Kamal Mostafa ]) AC_DEFUN([PKG_BUGS_TO], [kamal@whence.com]) AC_PREREQ([2.64]) AC_INIT(PKG_NAME, PKG_VERSION, PKG_BUGS_TO) dnl Release versioning info VERSION=PKG_VERSION AC_SUBST(VERSION) AM_INIT_AUTOMAKE AC_CONFIG_SRCDIR([src/Makefile.in]) AC_CONFIG_HEADERS([config.h]) AC_CONFIG_MACRO_DIR([m4]) # Checks for programs. AC_PROG_CC # AC_PROG_RANLIB # Configure dependency libs AC_CHECK_LIB([m],[lroundf]) # fftw3f deps_packages+=" fftw3f" # ALSA AC_ARG_WITH([alsa], AS_HELP_STRING([--without-alsa], [build without ALSA support])) AS_IF([test "x$with_alsa" == "xno"], # then use_alsa=0, # else use_alsa=1 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"], # then use_pulseaudio=0, # else use_pulseaudio=1 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"], # then use_sndfile=0, # else use_sndfile=1 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"], # then use_benchmarks=0, # else use_benchmarks=1) AC_DEFINE_UNQUOTED(USE_BENCHMARKS, $use_benchmarks, [Define to 1 to enable internal benchmarks]) AC_MSG_RESULT([ PKG_NAME PKG_VERSION configuration summary: --with-pulseaudio $with_pulseaudio ($use_pulseaudio) --with-alsa $with_alsa ($use_alsa) --with-sndfile $with_sndfile ($use_sndfile) --with-benchmarks $with_benchmarks ($use_benchmarks) deps_packages: $deps_packages ]) # Checks for libraries. PKG_CHECK_MODULES(DEPS, [ $deps_packages ]) AC_SUBST(DEPS_CFLAGS) AC_SUBST(DEPS_LIBS) # Checks for header files. # AC_CHECK_HEADERS([stdlib.h string.h unistd.h]) # Checks for typedefs, structures, and compiler characteristics. # AC_HEADER_STDBOOL # AC_TYPE_PID_T # Checks for library functions. # AC_FUNC_FORK AC_CONFIG_FILES([ Makefile src/Makefile src/minimodem.1 tests/Makefile ]) # testdata/Makefile AC_OUTPUT minimodem-0.19/INSTALL0000664000175000017500000003633212036614523011406 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. 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Run `configure --help' for more details. minimodem-0.19/install-sh0000775000175000017500000003253712036614523012364 00000000000000#!/bin/sh # install - install a program, script, or datafile scriptversion=2009-04-28.21; # 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. nl=' ' IFS=" "" $nl" # set DOITPROG to echo to test this script # Don't use :- since 4.3BSD and earlier shells don't like it. doit=${DOITPROG-} if test -z "$doit"; then doit_exec=exec else doit_exec=$doit fi # 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=${STRIPPROG-strip} posix_glob='?' initialize_posix_glob=' test "$posix_glob" != "?" || { if (set -f) 2>/dev/null; then posix_glob= else posix_glob=: fi } ' 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 no_target_directory= 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 *' '* | *' '* | *' '* | *'*'* | *'?'* | *'['*) echo "$0: invalid mode: $mode" >&2 exit 1;; esac shift;; -o) chowncmd="$chownprog $2" shift;; -s) stripcmd=$stripprog;; -t) dst_arg=$2 shift;; -T) no_target_directory=true;; --version) echo "$0 $scriptversion"; exit $?;; --) shift break;; -*) echo "$0: invalid option: $1" >&2 exit 1;; *) break;; esac shift done 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. Remove it from $@. for arg do if test -n "$dst_arg"; then # $@ is not empty: it contains at least $arg. set fnord "$@" "$dst_arg" shift # fnord fi shift # arg dst_arg=$arg done fi if test $# -eq 0; then if test -z "$dir_arg"; then echo "$0: no input file specified." >&2 exit 1 fi # It's OK to call `install-sh -d' without argument. # This can happen when creating conditional directories. exit 0 fi if test -z "$dir_arg"; then trap '(exit $?); exit' 1 2 13 15 # Set umask so as not to create temps with too-generous modes. # However, 'strip' requires both read and write access to temps. case $mode in # Optimize common cases. *644) cp_umask=133;; *755) cp_umask=22;; *[0-7]) if test -z "$stripcmd"; then u_plus_rw= else u_plus_rw='% 200' fi cp_umask=`expr '(' 777 - $mode % 1000 ')' $u_plus_rw`;; *) if test -z "$stripcmd"; then u_plus_rw= else u_plus_rw=,u+rw fi cp_umask=$mode$u_plus_rw;; esac fi for src do # Protect names starting with `-'. case $src in -*) src=./$src;; esac if test -n "$dir_arg"; then dst=$src dstdir=$dst test -d "$dstdir" dstdir_status=$? else # Waiting for this to be detected by the "$cpprog $src $dsttmp" command # might cause directories to be created, which would be especially bad # if $src (and thus $dsttmp) contains '*'. if test ! -f "$src" && test ! -d "$src"; then echo "$0: $src does not exist." >&2 exit 1 fi if test -z "$dst_arg"; then echo "$0: no destination specified." >&2 exit 1 fi dst=$dst_arg # Protect names starting with `-'. case $dst in -*) dst=./$dst;; esac # If destination is a directory, append the input filename; won't work # if double slashes aren't ignored. if test -d "$dst"; then if test -n "$no_target_directory"; then echo "$0: $dst_arg: Is a directory" >&2 exit 1 fi dstdir=$dst dst=$dstdir/`basename "$src"` dstdir_status=0 else # Prefer dirname, but fall back on a substitute if dirname fails. dstdir=` (dirname "$dst") 2>/dev/null || expr X"$dst" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \ X"$dst" : 'X\(//\)[^/]' \| \ X"$dst" : 'X\(//\)$' \| \ X"$dst" : 'X\(/\)' \| . 2>/dev/null || echo X"$dst" | sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/ q } /^X\(\/\/\)[^/].*/{ s//\1/ q } /^X\(\/\/\)$/{ s//\1/ q } /^X\(\/\).*/{ s//\1/ q } s/.*/./; q' ` test -d "$dstdir" dstdir_status=$? fi fi obsolete_mkdir_used=false if test $dstdir_status != 0; then case $posix_mkdir in '') # Create intermediate dirs using mode 755 as modified by the umask. # This is like FreeBSD 'install' as of 1997-10-28. umask=`umask` case $stripcmd.$umask in # Optimize common cases. *[2367][2367]) mkdir_umask=$umask;; .*0[02][02] | .[02][02] | .[02]) mkdir_umask=22;; *[0-7]) mkdir_umask=`expr $umask + 22 \ - $umask % 100 % 40 + $umask % 20 \ - $umask % 10 % 4 + $umask % 2 `;; *) mkdir_umask=$umask,go-w;; esac # With -d, create the new directory with the user-specified mode. # Otherwise, rely on $mkdir_umask. if test -n "$dir_arg"; then mkdir_mode=-m$mode else mkdir_mode= fi posix_mkdir=false case $umask in *[123567][0-7][0-7]) # POSIX mkdir -p sets u+wx bits regardless of umask, which # is incompatible with FreeBSD 'install' when (umask & 300) != 0. ;; *) tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$ trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0 if (umask $mkdir_umask && exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1 then if test -z "$dir_arg" || { # Check for POSIX incompatibilities with -m. # HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or # other-writeable bit of parent directory when it shouldn't. # FreeBSD 6.1 mkdir -m -p sets mode of existing directory. ls_ld_tmpdir=`ls -ld "$tmpdir"` case $ls_ld_tmpdir in d????-?r-*) different_mode=700;; d????-?--*) different_mode=755;; *) false;; esac && $mkdirprog -m$different_mode -p -- "$tmpdir" && { ls_ld_tmpdir_1=`ls -ld "$tmpdir"` test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1" } } then posix_mkdir=: fi rmdir "$tmpdir/d" "$tmpdir" else # Remove any dirs left behind by ancient mkdir implementations. rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null fi trap '' 0;; esac;; esac if $posix_mkdir && ( umask $mkdir_umask && $doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir" ) then : else # The umask is ridiculous, or mkdir does not conform to POSIX, # or it failed possibly due to a race condition. Create the # directory the slow way, step by step, checking for races as we go. case $dstdir in /*) prefix='/';; -*) prefix='./';; *) prefix='';; esac eval "$initialize_posix_glob" oIFS=$IFS IFS=/ $posix_glob set -f set fnord $dstdir shift $posix_glob set +f IFS=$oIFS prefixes= for d do test -z "$d" && 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 "$dsttmp" 2>/dev/null` && eval "$initialize_posix_glob" && $posix_glob set -f && set X $old && old=:$2:$4:$5:$6 && set X $new && new=:$2:$4:$5:$6 && $posix_glob set +f && test "$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-0.19/COPYING0000664000175000017500000010072612155373556011421 00000000000000minimodem - software audio Bell-type or RTTY FSK modem Copyright (C) 2011-2013 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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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-0.19/NEWS0000664000175000017500000000000012036614523011033 00000000000000minimodem-0.19/AUTHORS0000664000175000017500000000004112036614523011411 00000000000000Kamal Mostafa minimodem-0.19/ChangeLog0000664000175000017500000000000012036614523012106 00000000000000