pax_global_header00006660000000000000000000000064145457401340014521gustar00rootroot0000000000000052 comment=875963dd9ce5dee1adbe30751692bc6d255864e0 golang-github-korandiz-v4l-1.1.0/000077500000000000000000000000001454574013400165715ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/LICENSE.txt000066400000000000000000001045131454574013400204200ustar00rootroot00000000000000 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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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS How to Apply These Terms to Your New Programs If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) 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 . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: Copyright (C) This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . golang-github-korandiz-v4l-1.1.0/README000066400000000000000000000000531454574013400174470ustar00rootroot00000000000000https://pkg.go.dev/github.com/korandiz/v4l golang-github-korandiz-v4l-1.1.0/arch_386.go000066400000000000000000000123401454574013400204350ustar00rootroot00000000000000//go:build linux && 386 // +build linux,386 ///////////////////////////////////////////////////// // // // !!! THIS IS A GENERATED FILE, DO NOT EDIT !!! // // // ///////////////////////////////////////////////////// package v4l const ( vidioc_querycap = 0x80685600 vidioc_gFmt = 0xc0cc5604 vidioc_sFmt = 0xc0cc5605 vidioc_gParm = 0xc0cc5615 vidioc_sParm = 0xc0cc5616 vidioc_reqbufs = 0xc0145608 vidioc_querybuf = 0xc0445609 vidioc_qbuf = 0xc044560f vidioc_dqbuf = 0xc0445611 vidioc_streamon = 0x40045612 vidioc_streamoff = 0x40045613 vidioc_cropcap = 0xc02c563a vidioc_sCrop = 0x4014563c vidioc_enumstd = 0xc0405619 vidioc_enumFmt = 0xc0405602 vidioc_enumFramesizes = 0xc02c564a vidioc_enumFrameintervals = 0xc034564b vidioc_queryctrl = 0xc0445624 vidioc_querymenu = 0xc02c5625 vidioc_gCtrl = 0xc008561b vidioc_sCtrl = 0xc008561c ) const ( size_capability = 104 size_format = 204 size_streamparm = 204 size_requestbuffers = 20 size_buffer = 68 size_int = 4 size_cropcap = 44 size_crop = 20 size_standard = 64 size_fmtdesc = 64 size_frmsizeenum = 44 size_frmivalenum = 52 size_queryctrl = 68 size_querymenu = 44 size_control = 8 ) const ( offs_capability_driver = 0 size_capability_driver = 16 offs_capability_card = 16 size_capability_card = 32 offs_capability_busInfo = 48 size_capability_busInfo = 32 offs_capability_version = 80 offs_capability_capabilities = 84 offs_capability_deviceCaps = 88 ) const ( offs_format_typ = 0 offs_format_fmt = 4 ) const ( offs_pixFormat_width = 0 offs_pixFormat_height = 4 offs_pixFormat_pixelformat = 8 offs_pixFormat_field = 12 offs_pixFormat_bytesperline = 16 offs_pixFormat_sizeimage = 20 offs_pixFormat_colorspace = 24 offs_pixFormat_priv = 28 offs_pixFormat_flags = 32 offs_pixFormat_ycbcrEnc = 36 offs_pixFormat_quantization = 40 offs_pixFormat_xferFunc = 44 ) const ( offs_streamparm_typ = 0 offs_streamparm_parm = 4 ) const ( offs_captureparm_capability = 0 offs_captureparm_capturemode = 4 offs_captureparm_timeperframe = 8 offs_captureparm_extendedmode = 16 offs_captureparm_readbuffers = 20 ) const ( offs_requestbuffers_count = 0 offs_requestbuffers_typ = 4 offs_requestbuffers_memory = 8 ) const ( offs_buffer_index = 0 offs_buffer_typ = 4 offs_buffer_bytesused = 8 offs_buffer_flags = 12 offs_buffer_field = 16 offs_buffer_timecode = 28 offs_buffer_sequence = 44 offs_buffer_memory = 48 offs_buffer_offset = 52 offs_buffer_length = 56 ) const ( offs_cropcap_typ = 0 offs_cropcap_bounds = 4 offs_cropcap_defrect = 20 offs_cropcap_pixelaspect = 36 ) const ( offs_crop_typ = 0 offs_crop_c = 4 ) const ( offs_fract_numerator = 0 offs_fract_denominator = 4 ) const ( offs_timecode_typ = 0 offs_timecode_flags = 4 offs_timecode_frames = 8 offs_timecode_seconds = 9 offs_timecode_minutes = 10 offs_timecode_hours = 11 offs_timecode_userbits = 12 ) const ( offs_rect_left = 0 offs_rect_top = 4 offs_rect_width = 8 offs_rect_height = 12 ) const ( offs_standard_index = 0 offs_standard_id = 4 offs_standard_name = 12 size_standard_name = 24 offs_standard_frameperiod = 36 offs_standard_framelines = 44 ) const ( offs_fmtdesc_index = 0 offs_fmtdesc_typ = 4 offs_fmtdesc_flags = 8 offs_fmtdesc_description = 12 size_fmtdesc_description = 32 offs_fmtdesc_pixelformat = 44 ) const ( offs_frmsizeenum_index = 0 offs_frmsizeenum_pixelFormat = 4 offs_frmsizeenum_typ = 8 offs_frmsizeenum_discrete = 12 offs_frmsizeenum_stepwise = 12 ) const ( offs_frmsizeDiscrete_width = 0 offs_frmsizeDiscrete_height = 4 ) const ( offs_frmsizeStepwise_minWidth = 0 offs_frmsizeStepwise_maxWidth = 4 offs_frmsizeStepwise_stepWidth = 8 offs_frmsizeStepwise_minHeight = 12 offs_frmsizeStepwise_maxHeight = 16 offs_frmsizeStepwise_stepHeight = 20 ) const ( offs_frmivalenum_index = 0 offs_frmivalenum_pixelFormat = 4 offs_frmivalenum_width = 8 offs_frmivalenum_height = 12 offs_frmivalenum_typ = 16 offs_frmivalenum_discrete = 20 offs_frmivalenum_stepwise = 20 ) const ( offs_frmivalStepwise_min = 0 offs_frmivalStepwise_max = 8 offs_frmivalStepwise_step = 16 ) const ( offs_queryctrl_id = 0 offs_queryctrl_typ = 4 offs_queryctrl_name = 8 size_queryctrl_name = 32 offs_queryctrl_minimum = 40 offs_queryctrl_maximum = 44 offs_queryctrl_step = 48 offs_queryctrl_defaultValue = 52 offs_queryctrl_flags = 56 ) const ( offs_querymenu_id = 0 offs_querymenu_index = 4 offs_querymenu_name = 8 size_querymenu_name = 32 offs_querymenu_value = 8 ) const ( offs_control_id = 0 offs_control_value = 4 ) golang-github-korandiz-v4l-1.1.0/arch_amd64.go000066400000000000000000000123441454574013400210340ustar00rootroot00000000000000//go:build linux && amd64 // +build linux,amd64 ///////////////////////////////////////////////////// // // // !!! THIS IS A GENERATED FILE, DO NOT EDIT !!! // // // ///////////////////////////////////////////////////// package v4l const ( vidioc_querycap = 0x80685600 vidioc_gFmt = 0xc0d05604 vidioc_sFmt = 0xc0d05605 vidioc_gParm = 0xc0cc5615 vidioc_sParm = 0xc0cc5616 vidioc_reqbufs = 0xc0145608 vidioc_querybuf = 0xc0585609 vidioc_qbuf = 0xc058560f vidioc_dqbuf = 0xc0585611 vidioc_streamon = 0x40045612 vidioc_streamoff = 0x40045613 vidioc_cropcap = 0xc02c563a vidioc_sCrop = 0x4014563c vidioc_enumstd = 0xc0485619 vidioc_enumFmt = 0xc0405602 vidioc_enumFramesizes = 0xc02c564a vidioc_enumFrameintervals = 0xc034564b vidioc_queryctrl = 0xc0445624 vidioc_querymenu = 0xc02c5625 vidioc_gCtrl = 0xc008561b vidioc_sCtrl = 0xc008561c ) const ( size_capability = 104 size_format = 208 size_streamparm = 204 size_requestbuffers = 20 size_buffer = 88 size_int = 4 size_cropcap = 44 size_crop = 20 size_standard = 72 size_fmtdesc = 64 size_frmsizeenum = 44 size_frmivalenum = 52 size_queryctrl = 68 size_querymenu = 44 size_control = 8 ) const ( offs_capability_driver = 0 size_capability_driver = 16 offs_capability_card = 16 size_capability_card = 32 offs_capability_busInfo = 48 size_capability_busInfo = 32 offs_capability_version = 80 offs_capability_capabilities = 84 offs_capability_deviceCaps = 88 ) const ( offs_format_typ = 0 offs_format_fmt = 8 ) const ( offs_pixFormat_width = 0 offs_pixFormat_height = 4 offs_pixFormat_pixelformat = 8 offs_pixFormat_field = 12 offs_pixFormat_bytesperline = 16 offs_pixFormat_sizeimage = 20 offs_pixFormat_colorspace = 24 offs_pixFormat_priv = 28 offs_pixFormat_flags = 32 offs_pixFormat_ycbcrEnc = 36 offs_pixFormat_quantization = 40 offs_pixFormat_xferFunc = 44 ) const ( offs_streamparm_typ = 0 offs_streamparm_parm = 4 ) const ( offs_captureparm_capability = 0 offs_captureparm_capturemode = 4 offs_captureparm_timeperframe = 8 offs_captureparm_extendedmode = 16 offs_captureparm_readbuffers = 20 ) const ( offs_requestbuffers_count = 0 offs_requestbuffers_typ = 4 offs_requestbuffers_memory = 8 ) const ( offs_buffer_index = 0 offs_buffer_typ = 4 offs_buffer_bytesused = 8 offs_buffer_flags = 12 offs_buffer_field = 16 offs_buffer_timecode = 40 offs_buffer_sequence = 56 offs_buffer_memory = 60 offs_buffer_offset = 64 offs_buffer_length = 72 ) const ( offs_cropcap_typ = 0 offs_cropcap_bounds = 4 offs_cropcap_defrect = 20 offs_cropcap_pixelaspect = 36 ) const ( offs_crop_typ = 0 offs_crop_c = 4 ) const ( offs_fract_numerator = 0 offs_fract_denominator = 4 ) const ( offs_timecode_typ = 0 offs_timecode_flags = 4 offs_timecode_frames = 8 offs_timecode_seconds = 9 offs_timecode_minutes = 10 offs_timecode_hours = 11 offs_timecode_userbits = 12 ) const ( offs_rect_left = 0 offs_rect_top = 4 offs_rect_width = 8 offs_rect_height = 12 ) const ( offs_standard_index = 0 offs_standard_id = 8 offs_standard_name = 16 size_standard_name = 24 offs_standard_frameperiod = 40 offs_standard_framelines = 48 ) const ( offs_fmtdesc_index = 0 offs_fmtdesc_typ = 4 offs_fmtdesc_flags = 8 offs_fmtdesc_description = 12 size_fmtdesc_description = 32 offs_fmtdesc_pixelformat = 44 ) const ( offs_frmsizeenum_index = 0 offs_frmsizeenum_pixelFormat = 4 offs_frmsizeenum_typ = 8 offs_frmsizeenum_discrete = 12 offs_frmsizeenum_stepwise = 12 ) const ( offs_frmsizeDiscrete_width = 0 offs_frmsizeDiscrete_height = 4 ) const ( offs_frmsizeStepwise_minWidth = 0 offs_frmsizeStepwise_maxWidth = 4 offs_frmsizeStepwise_stepWidth = 8 offs_frmsizeStepwise_minHeight = 12 offs_frmsizeStepwise_maxHeight = 16 offs_frmsizeStepwise_stepHeight = 20 ) const ( offs_frmivalenum_index = 0 offs_frmivalenum_pixelFormat = 4 offs_frmivalenum_width = 8 offs_frmivalenum_height = 12 offs_frmivalenum_typ = 16 offs_frmivalenum_discrete = 20 offs_frmivalenum_stepwise = 20 ) const ( offs_frmivalStepwise_min = 0 offs_frmivalStepwise_max = 8 offs_frmivalStepwise_step = 16 ) const ( offs_queryctrl_id = 0 offs_queryctrl_typ = 4 offs_queryctrl_name = 8 size_queryctrl_name = 32 offs_queryctrl_minimum = 40 offs_queryctrl_maximum = 44 offs_queryctrl_step = 48 offs_queryctrl_defaultValue = 52 offs_queryctrl_flags = 56 ) const ( offs_querymenu_id = 0 offs_querymenu_index = 4 offs_querymenu_name = 8 size_querymenu_name = 32 offs_querymenu_value = 8 ) const ( offs_control_id = 0 offs_control_value = 4 ) golang-github-korandiz-v4l-1.1.0/arch_arm.go000066400000000000000000000123401454574013400206740ustar00rootroot00000000000000//go:build linux && arm // +build linux,arm ///////////////////////////////////////////////////// // // // !!! THIS IS A GENERATED FILE, DO NOT EDIT !!! // // // ///////////////////////////////////////////////////// package v4l const ( vidioc_querycap = 0x80685600 vidioc_gFmt = 0xc0cc5604 vidioc_sFmt = 0xc0cc5605 vidioc_gParm = 0xc0cc5615 vidioc_sParm = 0xc0cc5616 vidioc_reqbufs = 0xc0145608 vidioc_querybuf = 0xc0445609 vidioc_qbuf = 0xc044560f vidioc_dqbuf = 0xc0445611 vidioc_streamon = 0x40045612 vidioc_streamoff = 0x40045613 vidioc_cropcap = 0xc02c563a vidioc_sCrop = 0x4014563c vidioc_enumstd = 0xc0485619 vidioc_enumFmt = 0xc0405602 vidioc_enumFramesizes = 0xc02c564a vidioc_enumFrameintervals = 0xc034564b vidioc_queryctrl = 0xc0445624 vidioc_querymenu = 0xc02c5625 vidioc_gCtrl = 0xc008561b vidioc_sCtrl = 0xc008561c ) const ( size_capability = 104 size_format = 204 size_streamparm = 204 size_requestbuffers = 20 size_buffer = 68 size_int = 4 size_cropcap = 44 size_crop = 20 size_standard = 72 size_fmtdesc = 64 size_frmsizeenum = 44 size_frmivalenum = 52 size_queryctrl = 68 size_querymenu = 44 size_control = 8 ) const ( offs_capability_driver = 0 size_capability_driver = 16 offs_capability_card = 16 size_capability_card = 32 offs_capability_busInfo = 48 size_capability_busInfo = 32 offs_capability_version = 80 offs_capability_capabilities = 84 offs_capability_deviceCaps = 88 ) const ( offs_format_typ = 0 offs_format_fmt = 4 ) const ( offs_pixFormat_width = 0 offs_pixFormat_height = 4 offs_pixFormat_pixelformat = 8 offs_pixFormat_field = 12 offs_pixFormat_bytesperline = 16 offs_pixFormat_sizeimage = 20 offs_pixFormat_colorspace = 24 offs_pixFormat_priv = 28 offs_pixFormat_flags = 32 offs_pixFormat_ycbcrEnc = 36 offs_pixFormat_quantization = 40 offs_pixFormat_xferFunc = 44 ) const ( offs_streamparm_typ = 0 offs_streamparm_parm = 4 ) const ( offs_captureparm_capability = 0 offs_captureparm_capturemode = 4 offs_captureparm_timeperframe = 8 offs_captureparm_extendedmode = 16 offs_captureparm_readbuffers = 20 ) const ( offs_requestbuffers_count = 0 offs_requestbuffers_typ = 4 offs_requestbuffers_memory = 8 ) const ( offs_buffer_index = 0 offs_buffer_typ = 4 offs_buffer_bytesused = 8 offs_buffer_flags = 12 offs_buffer_field = 16 offs_buffer_timecode = 28 offs_buffer_sequence = 44 offs_buffer_memory = 48 offs_buffer_offset = 52 offs_buffer_length = 56 ) const ( offs_cropcap_typ = 0 offs_cropcap_bounds = 4 offs_cropcap_defrect = 20 offs_cropcap_pixelaspect = 36 ) const ( offs_crop_typ = 0 offs_crop_c = 4 ) const ( offs_fract_numerator = 0 offs_fract_denominator = 4 ) const ( offs_timecode_typ = 0 offs_timecode_flags = 4 offs_timecode_frames = 8 offs_timecode_seconds = 9 offs_timecode_minutes = 10 offs_timecode_hours = 11 offs_timecode_userbits = 12 ) const ( offs_rect_left = 0 offs_rect_top = 4 offs_rect_width = 8 offs_rect_height = 12 ) const ( offs_standard_index = 0 offs_standard_id = 8 offs_standard_name = 16 size_standard_name = 24 offs_standard_frameperiod = 40 offs_standard_framelines = 48 ) const ( offs_fmtdesc_index = 0 offs_fmtdesc_typ = 4 offs_fmtdesc_flags = 8 offs_fmtdesc_description = 12 size_fmtdesc_description = 32 offs_fmtdesc_pixelformat = 44 ) const ( offs_frmsizeenum_index = 0 offs_frmsizeenum_pixelFormat = 4 offs_frmsizeenum_typ = 8 offs_frmsizeenum_discrete = 12 offs_frmsizeenum_stepwise = 12 ) const ( offs_frmsizeDiscrete_width = 0 offs_frmsizeDiscrete_height = 4 ) const ( offs_frmsizeStepwise_minWidth = 0 offs_frmsizeStepwise_maxWidth = 4 offs_frmsizeStepwise_stepWidth = 8 offs_frmsizeStepwise_minHeight = 12 offs_frmsizeStepwise_maxHeight = 16 offs_frmsizeStepwise_stepHeight = 20 ) const ( offs_frmivalenum_index = 0 offs_frmivalenum_pixelFormat = 4 offs_frmivalenum_width = 8 offs_frmivalenum_height = 12 offs_frmivalenum_typ = 16 offs_frmivalenum_discrete = 20 offs_frmivalenum_stepwise = 20 ) const ( offs_frmivalStepwise_min = 0 offs_frmivalStepwise_max = 8 offs_frmivalStepwise_step = 16 ) const ( offs_queryctrl_id = 0 offs_queryctrl_typ = 4 offs_queryctrl_name = 8 size_queryctrl_name = 32 offs_queryctrl_minimum = 40 offs_queryctrl_maximum = 44 offs_queryctrl_step = 48 offs_queryctrl_defaultValue = 52 offs_queryctrl_flags = 56 ) const ( offs_querymenu_id = 0 offs_querymenu_index = 4 offs_querymenu_name = 8 size_querymenu_name = 32 offs_querymenu_value = 8 ) const ( offs_control_id = 0 offs_control_value = 4 ) golang-github-korandiz-v4l-1.1.0/arch_arm64.go000066400000000000000000000123441454574013400210520ustar00rootroot00000000000000//go:build linux && arm64 // +build linux,arm64 ///////////////////////////////////////////////////// // // // !!! THIS IS A GENERATED FILE, DO NOT EDIT !!! // // // ///////////////////////////////////////////////////// package v4l const ( vidioc_querycap = 0x80685600 vidioc_gFmt = 0xc0d05604 vidioc_sFmt = 0xc0d05605 vidioc_gParm = 0xc0cc5615 vidioc_sParm = 0xc0cc5616 vidioc_reqbufs = 0xc0145608 vidioc_querybuf = 0xc0585609 vidioc_qbuf = 0xc058560f vidioc_dqbuf = 0xc0585611 vidioc_streamon = 0x40045612 vidioc_streamoff = 0x40045613 vidioc_cropcap = 0xc02c563a vidioc_sCrop = 0x4014563c vidioc_enumstd = 0xc0485619 vidioc_enumFmt = 0xc0405602 vidioc_enumFramesizes = 0xc02c564a vidioc_enumFrameintervals = 0xc034564b vidioc_queryctrl = 0xc0445624 vidioc_querymenu = 0xc02c5625 vidioc_gCtrl = 0xc008561b vidioc_sCtrl = 0xc008561c ) const ( size_capability = 104 size_format = 208 size_streamparm = 204 size_requestbuffers = 20 size_buffer = 88 size_int = 4 size_cropcap = 44 size_crop = 20 size_standard = 72 size_fmtdesc = 64 size_frmsizeenum = 44 size_frmivalenum = 52 size_queryctrl = 68 size_querymenu = 44 size_control = 8 ) const ( offs_capability_driver = 0 size_capability_driver = 16 offs_capability_card = 16 size_capability_card = 32 offs_capability_busInfo = 48 size_capability_busInfo = 32 offs_capability_version = 80 offs_capability_capabilities = 84 offs_capability_deviceCaps = 88 ) const ( offs_format_typ = 0 offs_format_fmt = 8 ) const ( offs_pixFormat_width = 0 offs_pixFormat_height = 4 offs_pixFormat_pixelformat = 8 offs_pixFormat_field = 12 offs_pixFormat_bytesperline = 16 offs_pixFormat_sizeimage = 20 offs_pixFormat_colorspace = 24 offs_pixFormat_priv = 28 offs_pixFormat_flags = 32 offs_pixFormat_ycbcrEnc = 36 offs_pixFormat_quantization = 40 offs_pixFormat_xferFunc = 44 ) const ( offs_streamparm_typ = 0 offs_streamparm_parm = 4 ) const ( offs_captureparm_capability = 0 offs_captureparm_capturemode = 4 offs_captureparm_timeperframe = 8 offs_captureparm_extendedmode = 16 offs_captureparm_readbuffers = 20 ) const ( offs_requestbuffers_count = 0 offs_requestbuffers_typ = 4 offs_requestbuffers_memory = 8 ) const ( offs_buffer_index = 0 offs_buffer_typ = 4 offs_buffer_bytesused = 8 offs_buffer_flags = 12 offs_buffer_field = 16 offs_buffer_timecode = 40 offs_buffer_sequence = 56 offs_buffer_memory = 60 offs_buffer_offset = 64 offs_buffer_length = 72 ) const ( offs_cropcap_typ = 0 offs_cropcap_bounds = 4 offs_cropcap_defrect = 20 offs_cropcap_pixelaspect = 36 ) const ( offs_crop_typ = 0 offs_crop_c = 4 ) const ( offs_fract_numerator = 0 offs_fract_denominator = 4 ) const ( offs_timecode_typ = 0 offs_timecode_flags = 4 offs_timecode_frames = 8 offs_timecode_seconds = 9 offs_timecode_minutes = 10 offs_timecode_hours = 11 offs_timecode_userbits = 12 ) const ( offs_rect_left = 0 offs_rect_top = 4 offs_rect_width = 8 offs_rect_height = 12 ) const ( offs_standard_index = 0 offs_standard_id = 8 offs_standard_name = 16 size_standard_name = 24 offs_standard_frameperiod = 40 offs_standard_framelines = 48 ) const ( offs_fmtdesc_index = 0 offs_fmtdesc_typ = 4 offs_fmtdesc_flags = 8 offs_fmtdesc_description = 12 size_fmtdesc_description = 32 offs_fmtdesc_pixelformat = 44 ) const ( offs_frmsizeenum_index = 0 offs_frmsizeenum_pixelFormat = 4 offs_frmsizeenum_typ = 8 offs_frmsizeenum_discrete = 12 offs_frmsizeenum_stepwise = 12 ) const ( offs_frmsizeDiscrete_width = 0 offs_frmsizeDiscrete_height = 4 ) const ( offs_frmsizeStepwise_minWidth = 0 offs_frmsizeStepwise_maxWidth = 4 offs_frmsizeStepwise_stepWidth = 8 offs_frmsizeStepwise_minHeight = 12 offs_frmsizeStepwise_maxHeight = 16 offs_frmsizeStepwise_stepHeight = 20 ) const ( offs_frmivalenum_index = 0 offs_frmivalenum_pixelFormat = 4 offs_frmivalenum_width = 8 offs_frmivalenum_height = 12 offs_frmivalenum_typ = 16 offs_frmivalenum_discrete = 20 offs_frmivalenum_stepwise = 20 ) const ( offs_frmivalStepwise_min = 0 offs_frmivalStepwise_max = 8 offs_frmivalStepwise_step = 16 ) const ( offs_queryctrl_id = 0 offs_queryctrl_typ = 4 offs_queryctrl_name = 8 size_queryctrl_name = 32 offs_queryctrl_minimum = 40 offs_queryctrl_maximum = 44 offs_queryctrl_step = 48 offs_queryctrl_defaultValue = 52 offs_queryctrl_flags = 56 ) const ( offs_querymenu_id = 0 offs_querymenu_index = 4 offs_querymenu_name = 8 size_querymenu_name = 32 offs_querymenu_value = 8 ) const ( offs_control_id = 0 offs_control_value = 4 ) golang-github-korandiz-v4l-1.1.0/buffer.go000066400000000000000000000071551454574013400204010ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l import "io" // A Buffer holds the raw image data of a frame captured from a Device. It // implements io.Reader, io.ByteReader, io.ReaderAt, and io.Seeker. A call to // Capture, Close, or TurnOff on the corresponding Device may cause the contents // of the buffer to go away. type Buffer struct { d *device n uint64 pos int seq uint32 } // Size returns the total number of bytes in the buffer. As long as the data is // available, the return value is constant and unaffected by calls to the // methods of Buffer. If the data is no longer available, it returns 0. func (b *Buffer) Size() int64 { return int64(len(b.source())) } // Len returns the number of unread bytes in the buffer. If the data is no // longer available, it returns 0. func (b *Buffer) Len() int { src := b.source() if src == nil { return 0 } return len(src) - b.pos } // SeqNum returns the sequence number of the frame in the buffer as reported by // the kernel. func (b *Buffer) SeqNum() uint32 { return b.seq } // Read reads up to len(dst) bytes into dst, and returns the number of bytes // read, along with any error encountered. func (b *Buffer) Read(dst []byte) (int, error) { src := b.source() if src == nil { return 0, ErrBufferGone } if b.pos == len(src) { return 0, io.EOF } n := copy(dst, src[b.pos:]) b.pos += n return n, nil } // ReadAt reads up to len(dst) bytes into dst starting at the specified offset, // and returns the number of bytes read, along with any error encountered. // The seek offset is unaffected by ReadAt. func (b *Buffer) ReadAt(dst []byte, offset int64) (int, error) { src := b.source() if src == nil { return 0, ErrBufferGone } if offset < 0 { return 0, Error("negative offset") } if offset >= int64(len(src)) { return 0, io.EOF } n := copy(dst, src[offset:]) if n < len(dst) { return n, io.EOF } return n, nil } // ReadByte returns the next byte in the buffer. func (b *Buffer) ReadByte() (byte, error) { src := b.source() if src == nil { return 0, ErrBufferGone } if b.pos == len(src) { return 0, io.EOF } x := src[b.pos] b.pos++ return x, nil } // Seek sets the seek offset. func (b *Buffer) Seek(offset int64, whence int) (int64, error) { src := b.source() if src == nil { return 0, ErrBufferGone } var i int64 switch whence { case io.SeekStart: i = offset case io.SeekCurrent: i = int64(b.pos) + offset case io.SeekEnd: i = int64(len(src)) + offset default: return 0, Error("invalid whence") } if i < 0 { return 0, Error("negative offset") } if i > int64(len(src)) { i = int64(len(src)) } b.pos = int(i) return i, nil } // source returns the underlying byte slice of the buffer, or nil, if it's no // longer available. func (b *Buffer) source() []byte { if b.d.nCaptures != b.n || b.d.bufIndex == noBuffer { return nil } return b.d.buffers[b.d.bufIndex] } golang-github-korandiz-v4l-1.1.0/buffer_test.go000066400000000000000000000126401454574013400214330ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l import ( "io" "math/rand" "testing" ) const N = 100 func TestBuffer_Size(t *testing.T) { buf := initBufferTest() for i := 0; i < N+10; i++ { size := buf.Size() if size != N { t.Errorf("got: %d, expected: %d (i=%d)\n", size, N, i) return } buf.ReadByte() } } func TestBuffer_Len(t *testing.T) { buf := initBufferTest() for i := 0; i < N+10; i++ { length := buf.Len() n := N - i if n < 0 { n = 0 } if length != n { t.Errorf("got: %d, expected: %d (i=%d)\n", length, n, i) return } buf.ReadByte() } } func TestBuffer_Read(t *testing.T) { var ( buf = initBufferTest() arr = make([]byte, 2*N) err error n, m int ) for err == nil { n, err = buf.Read(arr[m : m+15]) m += n } if err != io.EOF { t.Errorf("expected EOF, got: %v (m=%d)\n", err, m) return } if m != N { t.Errorf("wrong byte count: %d (expected: %d)\n", m, N) return } for i := 0; i < N; i++ { if arr[i] != byte(i) { t.Errorf("got: %d, expected: %d (i=%d)\n", arr[i], byte(i), i) return } } } func TestBuffer_ReadAt(t *testing.T) { buf := initBufferTest() arr := make([]byte, N+10) for start := -10; start < N+10; start++ { for length := 0; length < N+10; length++ { n, err := buf.ReadAt(arr[:length], int64(start)) if start < 0 { if err == nil || n != 0 { t.Errorf("read at %d should have failed (length=%d, n=%d)\n", start, length, n) return } continue } if n > length { t.Errorf("read too many bytes (start=%d, length=%d, n=%d)\n", start, length, n) return } if n < length && err == nil { t.Errorf("short read with nil error (start=%d, length=%d, n=%d)\n", start, length, n) return } if start+length <= N && n < length { t.Errorf("short read (start=%d, length=%d, n=%d)\n", start, length, n) return } m := N - start if m < 0 { m = 0 } if start+length > N && n != m { t.Errorf("read %d bytes instead of %d (start=%d, length=%d)\n", n, m, start, length) return } if start+length > N && err != io.EOF { t.Errorf("expected EOF, got: %v (start=%d, length=%d)\n", err, start, length) return } for i := 0; i < n; i++ { if arr[i] != byte(start+i) { t.Errorf("expected: %d, got: %d (start=%d, length=%d, i=%d)\n", start+i, arr[i], start, length, i) return } } } } } func TestBuffer_ReadByte(t *testing.T) { buf := initBufferTest() for i := 0; i < N; i++ { b, err := buf.ReadByte() if err != nil { t.Errorf("unexpected error: %v (i=%d)\n", err, i) return } if b != byte(i) { t.Errorf("got: %d, expected: %d\n", b, i) return } } if _, err := buf.ReadByte(); err != io.EOF { t.Error("expected EOF, got:", err) return } } func TestBuffer_Seek(t *testing.T) { buf := initBufferTest() rand.Seed(42) for _, whence := range []int{io.SeekStart, io.SeekEnd} { for i := 0; i < 10*N; i++ { offs := rand.Int63n(N) var m int64 if whence == io.SeekEnd { offs = -offs - 1 m = N } m += offs n, err := buf.Seek(offs, whence) if err != nil { t.Errorf("unexpected error: %v (i=%d, offs=%d, whence=%d)\n", err, i, offs, whence) return } if n != m { t.Errorf("bad offset: %d (m=%d, i=%d, offs=%d, whence=%d)\n", n, m, i, offs, whence) return } b, err := buf.ReadByte() if err != nil { t.Errorf("unexpected error: %v (i=%d, offs=%d, whence=%d)\n", err, i, offs, whence) return } if b != byte(m) { t.Errorf("read: %d (m=%d, i=%d, offs=%d, whence=%d)\n", b, m, i, offs, whence) return } } } buf = initBufferTest() var p int64 for i := 0; i < 10*N; i++ { m := rand.Int63n(N) offs := m - p n, err := buf.Seek(offs, io.SeekCurrent) if err != nil { t.Errorf("unexpected error: %v (i=%d, offs=%d, whence=%d)\n", err, i, offs, io.SeekCurrent) return } if n != m { t.Errorf("bad offset: %d (m=%d, i=%d, offs=%d, whence=%d)\n", n, m, i, offs, io.SeekCurrent) return } b, err := buf.ReadByte() if err != nil { t.Errorf("unexpected error: %v (i=%d, offs=%d, whence=%d)\n", err, i, offs, io.SeekCurrent) return } if b != byte(m) { t.Errorf("read: %d (m=%d, i=%d, offs=%d, whence=%d)\n", b, m, i, offs, io.SeekCurrent) return } p = n + 1 } _, err := buf.Seek(-1, io.SeekStart) if err == nil { t.Error("seek to offset -1 should have failed") return } } func initBufferTest() *Buffer { buf := make([]byte, N) for i := range buf { buf[i] = byte(i) } d := device{ buffers: [][]byte{nil, nil, buf, nil}, bufIndex: 2, nCaptures: 1, } return &Buffer{ d: &d, n: 1, pos: 0, } } golang-github-korandiz-v4l-1.1.0/demos/000077500000000000000000000000001454574013400177005ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/demos/streamcam/000077500000000000000000000000001454574013400216545ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/demos/streamcam/LICENSE.txt000066400000000000000000001045131454574013400235030ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. 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The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. 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The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . golang-github-korandiz-v4l-1.1.0/demos/streamcam/go.mod000066400000000000000000000001401454574013400227550ustar00rootroot00000000000000module github.com/korandiz/v4l/demos/streamcam go 1.15 require github.com/korandiz/v4l v1.0.5 golang-github-korandiz-v4l-1.1.0/demos/streamcam/go.sum000066400000000000000000000002451454574013400230100ustar00rootroot00000000000000github.com/korandiz/v4l v1.0.5 h1:LdbunFQJ+EBuU9v60ryeRefofTim6css+B56VkwPiMg= github.com/korandiz/v4l v1.0.5/go.mod h1:pftxPG7hkuUgepioAY6PAE81mShaVjzd95X/WF4Izus= golang-github-korandiz-v4l-1.1.0/demos/streamcam/streamcam.go000066400000000000000000000154021454574013400241610ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . // Command streamcam streams MJPEG from a V4L device over HTTP. // // Command Line // // Usage: // streamcam [flags] // // Flags: // -a string // address to listen on (default ":8080") // -d string // path to the capture device // -f int // frame rate // -h int // image height // -l // print supported device configs and quit // -r // reset all controls to default // -w int // image width package main import ( "bytes" "flag" "fmt" "image" "image/jpeg" "log" "net/http" "os" "os/signal" "sync" "time" "github.com/korandiz/v4l" "github.com/korandiz/v4l/fmt/mjpeg" ) func main() { var ( d = flag.String("d", "", "path to the capture device") w = flag.Int("w", 0, "image width") h = flag.Int("h", 0, "image height") f = flag.Int("f", 0, "frame rate") a = flag.String("a", ":8080", "address to listen on") l = flag.Bool("l", false, "print supported device configs and quit") r = flag.Bool("r", false, "reset all controls to default") ) flag.Parse() if *d == "" { devs := v4l.FindDevices() if len(devs) != 1 { fmt.Fprintln(os.Stderr, "Use -d to select device.") for _, info := range devs { fmt.Fprintln(os.Stderr, " ", info.Path) } os.Exit(1) } *d = devs[0].Path } fmt.Fprintln(os.Stderr, "Using device", *d) cam, err := v4l.Open(*d) fatal("Open", err) if *l { configs, err := cam.ListConfigs() fatal("ListConfigs", err) fmt.Fprintln(os.Stderr, "Supported device configs:") found := false for _, cfg := range configs { if cfg.Format != mjpeg.FourCC { continue } found = true fmt.Fprintln(os.Stderr, " ", cfg2str(cfg)) } if !found { fmt.Fprintln(os.Stderr, " (none)") } os.Exit(0) } cfg, err := cam.GetConfig() fatal("GetConfig", err) cfg.Format = mjpeg.FourCC if *w > 0 { cfg.Width = *w } if *h > 0 { cfg.Height = *h } if *f > 0 { cfg.FPS = v4l.Frac{uint32(*f), 1} } fmt.Fprintln(os.Stderr, "Requested config:", cfg2str(cfg)) err = cam.SetConfig(cfg) fatal("SetConfig", err) err = cam.TurnOn() fatal("TurnOn", err) cfg, err = cam.GetConfig() fatal("GetConfig", err) if cfg.Format != mjpeg.FourCC { fmt.Fprintln(os.Stderr, "Failed to set MJPEG format.") os.Exit(1) } fmt.Fprintln(os.Stderr, "Actual device config:", cfg2str(cfg)) if *r { ctrls, err := cam.ListControls() fatal("ListControls", err) for _, ctrl := range ctrls { cam.SetControl(ctrl.CID, ctrl.Default) } } blankImg := image.NewRGBA(image.Rect(0, 0, cfg.Width, cfg.Height)) buf := new(bytes.Buffer) jpeg.Encode(buf, blankImg, nil) blank = buf.Bytes() go handleInterrupt() go stream(cam) log.Println("Listening on address", *a) srv := http.Server{ Addr: *a, Handler: http.HandlerFunc(serveHTTP), } err = srv.ListenAndServe() fatal("ListenAndServe", err) } func cfg2str(cfg v4l.DeviceConfig) string { return fmt.Sprintf("%dx%d @ %.4g FPS", cfg.Width, cfg.Height, float64(cfg.FPS.N)/float64(cfg.FPS.D)) } var ( mu sync.Mutex clients []*client stopped bool quit = make(chan int, 1) blank []byte ) type client struct { i int ch chan []byte } func newClient() *client { mu.Lock() defer mu.Unlock() if stopped { return nil } clt := &client{ i: len(clients), ch: make(chan []byte, 1), } clt.ch <- blank clients = append(clients, clt) return clt } func (clt *client) remove() { mu.Lock() defer mu.Unlock() i := clt.i last := len(clients) - 1 clients[i] = clients[last] clients[i].i = i clients[last] = nil clients = clients[:last] clt.i = -1 if stopped && len(clients) == 0 { quit <- 1 } } func handleInterrupt() { ch := make(chan os.Signal, 1) signal.Notify(ch, os.Interrupt) <-ch log.Println("Stopping...") mu.Lock() stopped = true if len(clients) == 0 { quit <- 1 } else { for _, clt := range clients { close(clt.ch) } } mu.Unlock() <-quit os.Exit(0) } func stream(cam *v4l.Device) { for { buf, err := cam.Capture() if err != nil { log.Println("Capture:", err) proc, _ := os.FindProcess(os.Getpid()) proc.Signal(os.Interrupt) break } b := make([]byte, buf.Size()) buf.ReadAt(b, 0) mu.Lock() if stopped { mu.Unlock() break } for _, clt := range clients { select { case clt.ch <- b: case <-clt.ch: clt.ch <- b } } mu.Unlock() } } func serveHTTP(w http.ResponseWriter, r *http.Request) { log.Printf("[%s] New connection\n", r.RemoteAddr) hj, ok := w.(http.Hijacker) if !ok { log.Printf("[%s] ResponseWrite is not a Hijacker", r.RemoteAddr) http.Error(w, "Internal Server Error", 500) return } conn, _, err := hj.Hijack() if err != nil { log.Printf("[%s] Hijack: %v\n", r.RemoteAddr, err) http.Error(w, "Internal Server Error", 500) return } defer conn.Close() clt := newClient() if clt == nil { return } defer clt.remove() const B = "45c7pIy0cxa4vWtwGuVuAkbzKAQGpRjz9eyhyHTv" _, err = conn.Write([]byte("HTTP/1.1 200 OK\r\n" + "Date: " + time.Now().UTC().Format(http.TimeFormat) + "\r\n" + "Content-Type: multipart/x-mixed-replace; boundary=" + B + "\r\n" + "Cache-Control: no-cache, no-store, max-age=0, must-revalidate\r\n" + "Pragma: no-cache\r\n" + "\r\n" + "--" + B + "\r\n")) if err != nil { log.Printf("[%s] %v\n", r.RemoteAddr, err) return } for { buf := <-clt.ch conn.SetDeadline(time.Now().Add(time.Second)) _, err := conn.Write([]byte("Content-Type: image/jpeg\r\n\r\n")) if err != nil { log.Printf("[%s] %v\n", r.RemoteAddr, err) return } if buf == nil { _, err := conn.Write(blank) if err == nil { conn.Write([]byte("--" + B + "--\r\n")) } else { log.Printf("[%s] %v\n", r.RemoteAddr, err) } log.Printf("[%s] Quitting\n", r.RemoteAddr) return } _, err = conn.Write(buf) if err != nil { log.Printf("[%s] %v\n", r.RemoteAddr, err) return } _, err = conn.Write([]byte("--" + B + "\r\n")) if err != nil { log.Printf("[%s] %v\n", r.RemoteAddr, err) return } } } func fatal(p string, err error) { if err != nil { fmt.Fprintf(os.Stderr, "%s: %v\n", p, err) os.Exit(1) } } golang-github-korandiz-v4l-1.1.0/demos/viewcam/000077500000000000000000000000001454574013400213335ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/demos/viewcam/LICENSE.txt000066400000000000000000001045131454574013400231620ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. 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Copyright (C) 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 . Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: Copyright (C) This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see . The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read . golang-github-korandiz-v4l-1.1.0/demos/viewcam/go.mod000066400000000000000000000002021454574013400224330ustar00rootroot00000000000000module github.com/korandiz/v4l/demos/viewcam go 1.15 require ( github.com/gotk3/gotk3 v0.6.1 github.com/korandiz/v4l v1.0.5 ) golang-github-korandiz-v4l-1.1.0/demos/viewcam/go.sum000066400000000000000000000005101454574013400224620ustar00rootroot00000000000000github.com/gotk3/gotk3 v0.6.1 h1:GJ400a0ecEEWrzjBvzBzH+pB/esEMIGdB9zPSmBdoeo= github.com/gotk3/gotk3 v0.6.1/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q= github.com/korandiz/v4l v1.0.5 h1:LdbunFQJ+EBuU9v60ryeRefofTim6css+B56VkwPiMg= github.com/korandiz/v4l v1.0.5/go.mod h1:pftxPG7hkuUgepioAY6PAE81mShaVjzd95X/WF4Izus= golang-github-korandiz-v4l-1.1.0/demos/viewcam/viewcam.go000066400000000000000000000455501454574013400233260ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . // Command viewcam displays the video captured from a V4L device in a GTK-based // GUI. // // Usage: // viewcam package main import ( "errors" "fmt" "image" "strconv" "github.com/gotk3/gotk3/gdk" "github.com/gotk3/gotk3/glib" "github.com/gotk3/gotk3/gtk" "github.com/korandiz/v4l" "github.com/korandiz/v4l/fmt/yuyv" ) func main() { var ( dp DevicePickerWindow vc VideoCaptureWindow cp ControlPanelWindow ) dp.OnClose = func() { if dp.Video { vc.DevicePath = dp.DevicePath vc.DeviceConfig = dp.DeviceConfig vc.Open() } if dp.ControlPanel { cp.DevicePath = dp.DevicePath cp.Open() } if !dp.Video && !dp.ControlPanel { gtk.MainQuit() } } vc.OnClose = func() { cp.Close() dp.Open() } cp.OnClose = func() { vc.Close() dp.Open() } gtk.Init(nil) dp.Open() gtk.Main() } type DevicePickerWindow struct { DevicePath string DeviceConfig v4l.DeviceConfig Video bool ControlPanel bool OnClose func() open bool devices []v4l.DeviceInfo configs []v4l.DeviceConfig ticker *ticker window *gtk.Window deviceList *gtk.ListBox configList *gtk.ListBox pathLabel *gtk.Label nameLabel *gtk.Label businfoLabel *gtk.Label driverLabel *gtk.Label cameraLabel *gtk.Label videoButton *gtk.RadioButton ctrlButton *gtk.RadioButton bothButton *gtk.RadioButton } func (w *DevicePickerWindow) Open() { if w.open { return } w.DevicePath = "" w.DeviceConfig = v4l.DeviceConfig{} w.Video = false w.ControlPanel = false w.initWidgets() w.open = true w.updateDeviceList() w.ticker = newTicker(500, w.updateDeviceList) } func (w *DevicePickerWindow) Close() { if !w.open { return } w.window.Destroy() } func (w *DevicePickerWindow) initWidgets() { var err error w.window, err = gtk.WindowNew(gtk.WINDOW_TOPLEVEL) fatal(err) w.window.SetTitle("Video Capture Demo") w.window.SetIconName("camera-web") w.window.SetPosition(gtk.WIN_POS_CENTER) w.window.SetSizeRequest(640, 320) w.window.SetBorderWidth(6) w.window.Connect("destroy", w.windowDestroyed) grid1, err := gtk.GridNew() fatal(err) grid1.SetColumnHomogeneous(true) grid1.SetColumnSpacing(6) grid1.SetRowSpacing(6) w.window.Add(grid1) frame, err := gtk.FrameNew("Devices:") fatal(err) grid1.Attach(frame, 0, 0, 1, 1) scrolled, err := gtk.ScrolledWindowNew(nil, nil) fatal(err) scrolled.SetHExpand(true) scrolled.SetVExpand(true) frame.Add(scrolled) w.deviceList, err = gtk.ListBoxNew() fatal(err) w.deviceList.Connect("selected-rows-changed", w.deviceSelected) scrolled.Add(w.deviceList) frame, err = gtk.FrameNew("Configurations:") fatal(err) grid1.Attach(frame, 1, 0, 1, 1) scrolled, err = gtk.ScrolledWindowNew(nil, nil) fatal(err) scrolled.SetHExpand(true) scrolled.SetVExpand(true) frame.Add(scrolled) w.configList, err = gtk.ListBoxNew() fatal(err) w.configList.Connect("selected-rows-changed", w.configSelected) scrolled.Add(w.configList) grid2, err := gtk.GridNew() fatal(err) grid2.SetColumnSpacing(12) grid2.SetRowSpacing(6) grid1.Attach(grid2, 0, 1, 1, 1) w.pathLabel = labelNew("") w.nameLabel = labelNew("") w.businfoLabel = labelNew("") w.driverLabel = labelNew("") w.cameraLabel = labelNew("") grid2.Attach(labelNew("Path:"), 0, 0, 1, 1) grid2.Attach(labelNew("Name:"), 0, 1, 1, 1) grid2.Attach(labelNew("BusInfo:"), 0, 2, 1, 1) grid2.Attach(labelNew("Driver:"), 0, 3, 1, 1) grid2.Attach(labelNew("Camera:"), 0, 4, 1, 1) grid2.Attach(w.pathLabel, 1, 0, 1, 1) grid2.Attach(w.nameLabel, 1, 1, 1, 1) grid2.Attach(w.businfoLabel, 1, 2, 1, 1) grid2.Attach(w.driverLabel, 1, 3, 1, 1) grid2.Attach(w.cameraLabel, 1, 4, 1, 1) w.clearLabels() box, err := gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 6) fatal(err) grid1.Attach(box, 1, 1, 1, 1) w.videoButton, err = gtk.RadioButtonNewWithLabel(nil, "Video") fatal(err) box.Add(w.videoButton) w.ctrlButton, err = gtk.RadioButtonNewWithLabelFromWidget(w.videoButton, "Control Panel") fatal(err) box.Add(w.ctrlButton) w.bothButton, err = gtk.RadioButtonNewWithLabelFromWidget(w.videoButton, "Both") fatal(err) box.Add(w.bothButton) button, err := gtk.ButtonNewWithLabel("Start") fatal(err) button.Connect("clicked", w.startClicked) box.Add(button) w.window.ShowAll() } func (w *DevicePickerWindow) windowDestroyed() { w.ticker.cancel() *w = DevicePickerWindow{ DevicePath: w.DevicePath, DeviceConfig: w.DeviceConfig, Video: w.Video, ControlPanel: w.ControlPanel, OnClose: w.OnClose, } w.OnClose() } func (w *DevicePickerWindow) updateDeviceList() { devices := v4l.FindDevices() if deviceListsEqual(devices, w.devices) { return } oldIndex := -1 newIndex := -1 if row := w.deviceList.GetSelectedRow(); row != nil { oldIndex = row.GetIndex() for i := range devices { if devices[i] == w.devices[oldIndex] { newIndex = i } } } for i := range w.devices { if i < oldIndex || newIndex == -1 { w.deviceList.Remove(w.deviceList.GetRowAtIndex(0)) } else if i > oldIndex { w.deviceList.Remove(w.deviceList.GetRowAtIndex(1)) } } for i := range devices { if i < newIndex { w.deviceList.Insert(labelNew(devices[i].Path), i) } else if i > newIndex { w.deviceList.Add(labelNew(devices[i].Path)) } } w.devices = devices w.deviceList.ShowAll() } func (w *DevicePickerWindow) deviceSelected() { if !w.open { return } w.clearConfigList() row := w.deviceList.GetSelectedRow() if row == nil { w.clearLabels() w.DevicePath = "" return } err := w.fillConfigList(w.devices[row.GetIndex()]) if err != nil { w.modalWarning(err.Error()) w.deviceList.SelectRow(nil) return } device := w.devices[row.GetIndex()] w.setLabels(device) w.DevicePath = device.Path } func (w *DevicePickerWindow) clearConfigList() { w.configs = nil w.DeviceConfig = v4l.DeviceConfig{} for { row := w.configList.GetRowAtIndex(0) if row == nil { break } w.configList.Remove(row) } } func (w *DevicePickerWindow) clearLabels() { w.pathLabel.SetLabel("\u2014") w.nameLabel.SetLabel("\u2014") w.businfoLabel.SetLabel("\u2014") w.driverLabel.SetLabel("\u2014") w.cameraLabel.SetLabel("\u2014") } func (w *DevicePickerWindow) setLabels(info v4l.DeviceInfo) { dn := info.DriverName dv := info.DriverVersion c := "No" if info.Camera { c = "Yes" } w.pathLabel.SetLabel(info.Path) w.nameLabel.SetLabel(info.DeviceName) w.businfoLabel.SetLabel(info.BusInfo) w.driverLabel.SetLabel(fmt.Sprintf("%s %v.%v.%v", dn, dv[0], dv[1], dv[2])) w.cameraLabel.SetLabel(c) } func (w *DevicePickerWindow) fillConfigList(info v4l.DeviceInfo) error { dev, err := v4l.Open(info.Path) if err != nil { return errors.New("Open: " + err.Error()) } defer dev.Close() cfgs, err := dev.ListConfigs() if err != nil { return errors.New("ListConfigs: " + err.Error()) } for i := range cfgs { if cfgs[i].Format != yuyv.FourCC { continue } w.configList.Add(labelNew(cfg2str(cfgs[i]))) w.configs = append(w.configs, cfgs[i]) } w.configList.ShowAll() return nil } func (w *DevicePickerWindow) configSelected() { if !w.open { return } row := w.configList.GetSelectedRow() if row == nil { w.DeviceConfig = v4l.DeviceConfig{} return } w.DeviceConfig = w.configs[row.GetIndex()] } func (w *DevicePickerWindow) startClicked() { video := w.videoButton.GetActive() || w.bothButton.GetActive() controlPanel := w.ctrlButton.GetActive() || w.bothButton.GetActive() if row := w.deviceList.GetSelectedRow(); row == nil { w.modalWarning("Please select a device.") return } if row := w.configList.GetSelectedRow(); row == nil && video { w.modalWarning("Please select a configuration.") return } w.Video = video w.ControlPanel = controlPanel w.window.Destroy() } func (w *DevicePickerWindow) modalWarning(msg string) { dlg := gtk.MessageDialogNew(w.window, gtk.DIALOG_MODAL, gtk.MESSAGE_WARNING, gtk.BUTTONS_OK, msg) dlg.SetTitle("Error") dlg.SetPosition(gtk.WIN_POS_CENTER_ON_PARENT) dlg.Connect("response", dlg.Destroy) dlg.ShowAll() } type VideoCaptureWindow struct { DevicePath string DeviceConfig v4l.DeviceConfig OnClose func() open bool capture *capture window *gtk.Window pixbuf *gdk.Pixbuf image *gtk.Image } func (w *VideoCaptureWindow) Open() { if w.open { return } w.initWidgets() w.open = true w.capture = newCapture(w) } func (w *VideoCaptureWindow) Close() { if !w.open { return } w.window.Destroy() } func (w *VideoCaptureWindow) initWidgets() { var err error w.window, err = gtk.WindowNew(gtk.WINDOW_TOPLEVEL) fatal(err) w.window.SetTitle("Video Capture Demo") w.window.SetIconName("camera-web") w.window.SetPosition(gtk.WIN_POS_CENTER) w.window.SetResizable(false) w.window.Connect("destroy", w.windowDestroyed) w.pixbuf, err = gdk.PixbufNew(gdk.COLORSPACE_RGB, true, 8, w.DeviceConfig.Width, w.DeviceConfig.Height) fatal(err) for p := w.pixbuf.GetPixels(); len(p) > 0; p = p[1:] { p[0] = 0 } w.image, err = gtk.ImageNew() fatal(err) w.image.SetFromPixbuf(w.pixbuf) w.window.Add(w.image) w.window.ShowAll() } func (w *VideoCaptureWindow) windowDestroyed() { w.capture.cancel() *w = VideoCaptureWindow{ DevicePath: w.DevicePath, DeviceConfig: w.DeviceConfig, OnClose: w.OnClose, } w.OnClose() } func (w *VideoCaptureWindow) modalError(prefix string, err error) { msg := prefix + ": " + err.Error() dlg := gtk.MessageDialogNew(w.window, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_CLOSE, msg) dlg.SetTitle("Error") dlg.SetPosition(gtk.WIN_POS_CENTER_ON_PARENT) dlg.Connect("response", dlg.Destroy) dlg.Connect("destroy", w.window.Destroy) dlg.ShowAll() } type capture struct { cancelled bool w *VideoCaptureWindow yuyv *yuyv.Image } func newCapture(w *VideoCaptureWindow) *capture { c := &capture{w: w} go c.captureFrames(w.DevicePath, w.DeviceConfig) return c } func (c *capture) cancel() { c.cancelled = true } func (c *capture) captureFrames(path string, config v4l.DeviceConfig) { device, err := v4l.Open(path) if err != nil { c.modalError("Open", err) return } defer device.Close() if err := device.SetConfig(config); err != nil { c.modalError("SetConfig", err) return } if err := device.TurnOn(); err != nil { c.modalError("TurnOn", err) return } config, err = device.GetConfig() if err != nil { c.modalError("GetConfig", err) return } if config.Format != yuyv.FourCC { c.modalError("SetConfig", errors.New("failed to set YUYV format")) return } binfo, err := device.BufferInfo() if err != nil { c.modalError("BufferInfo", err) return } c.yuyv = &yuyv.Image{ Pix: make([]byte, binfo.BufferSize), Stride: binfo.ImageStride, Rect: image.Rect(0, 0, config.Width, config.Height), } for { buffer, err := device.Capture() if err != nil { c.modalError("Capture", err) return } buffer.ReadAt(c.yuyv.Pix, 0) ok := c.updateImage() if !ok { return } } } func (c *capture) modalError(prefix string, err error) { ch := make(chan struct{}) glib.IdleAdd(func() { if !c.cancelled { c.w.modalError(prefix, err) } ch <- struct{}{} }) <-ch } func (c *capture) updateImage() bool { ch := make(chan bool) glib.IdleAdd(func() { if c.cancelled { ch <- false return } w := c.w rgba := &image.RGBA{ Pix: w.pixbuf.GetPixels(), Stride: w.pixbuf.GetRowstride(), Rect: image.Rect(0, 0, w.pixbuf.GetWidth(), w.pixbuf.GetHeight()), } yuyv.ToRGBA(rgba, rgba.Rect, c.yuyv, c.yuyv.Rect.Min) w.image.SetFromPixbuf(c.w.pixbuf) ch <- true }) return <-ch } type ControlPanelWindow struct { DevicePath string OnClose func() open bool device *v4l.Device controls []v4l.ControlInfo updaters []updater ticker *ticker window *gtk.Window } type updater func(int32) func (w *ControlPanelWindow) Open() { if w.open { return } w.initWidgets() w.open = true w.initControls() w.updateControls() w.ticker = newTicker(100, w.updateControls) } func (w *ControlPanelWindow) Close() { if !w.open { return } w.window.Destroy() } func (w *ControlPanelWindow) initWidgets() { var err error w.window, err = gtk.WindowNew(gtk.WINDOW_TOPLEVEL) fatal(err) w.window.SetTitle("Control Panel") w.window.SetIconName("camera-web") w.window.SetPosition(gtk.WIN_POS_CENTER) w.window.SetSizeRequest(640, 320) w.window.Connect("destroy", w.windowDestroyed) w.window.ShowAll() } func (w *ControlPanelWindow) initControls() { var err error w.device, err = v4l.Open(w.DevicePath) if err != nil { w.modalError("Open", err) return } w.controls, err = w.device.ListControls() if err != nil { w.modalError("ListControls", err) return } notebook, err := gtk.NotebookNew() fatal(err) notebook.SetScrollable(true) notebook.SetShowBorder(false) w.window.Add(notebook) tabs := make(map[uint32]*gtk.Grid) for i, ctrl := range w.controls { class := (ctrl.CID & 0x0fff0000) >> 16 grid, ok := tabs[class] if !ok { grid, err = gtk.GridNew() fatal(err) grid.SetBorderWidth(12) grid.SetColumnSpacing(12) grid.SetRowSpacing(12) grid.SetRowHomogeneous(true) grid.SetVAlign(gtk.ALIGN_START) className := ctrlClassNames[class] if len(className) == 0 { className = fmt.Sprintf("Class %03x", class) } notebook.AppendPage(grid, labelNew(className)) tabs[class] = grid } frame, err := gtk.FrameNew("") fatal(err) if ctrl.Type != "button" { grid.Attach(labelNew(ctrl.Name), 0, i, 1, 1) } if ctrl.Type != "int" { frame.SetHAlign(gtk.ALIGN_START) frame.SetVAlign(gtk.ALIGN_CENTER) } frame.SetShadowType(gtk.SHADOW_NONE) grid.Attach(frame, 1, i, 1, 1) var upd updater switch ctrl.Type { case "int": upd = w.createIntControl(&frame.Container, ctrl) case "bool": upd = w.createBoolControl(&frame.Container, ctrl) case "enum": upd = w.createEnumControl(&frame.Container, ctrl) case "button": upd = w.createButtonControl(&frame.Container, ctrl) } w.updaters = append(w.updaters, upd) } notebook.ShowAll() } var ctrlClassNames = map[uint32]string{ 0x098: "User Controls", 0x099: "Codec", 0x09a: "Camera", 0x09b: "FM Modulator", 0x09c: "Flash", 0x09d: "JPEG", 0x09e: "Image Source", 0x09f: "Image Processing", 0x0a0: "Digital Video", 0x0a1: "FM Receiver", 0x0a2: "RF Tuner", 0x0a3: "Detection", 0x0a4: "Stateless Codec", 0x0a5: "Colorimetry", } func (w *ControlPanelWindow) createIntControl(parent *gtk.Container, ctrl v4l.ControlInfo) updater { var err error box, err := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 6) fatal(err) parent.Add(box) scale, err := gtk.ScaleNewWithRange(gtk.ORIENTATION_HORIZONTAL, float64(ctrl.Min), float64(ctrl.Max), float64(ctrl.Step)) fatal(err) scale.SetHExpand(true) scale.SetProperty("draw-value", false) box.Add(scale) frame, err := gtk.FrameNew("") fatal(err) frame.SetShadowType(gtk.SHADOW_NONE) frame.SetSizeRequest(50, 0) box.Add(frame) label, err := gtk.LabelNew("") fatal(err) label.SetHAlign(gtk.ALIGN_END) frame.Add(label) scale.Connect("value-changed", func() { value := scale.GetValue() if value >= 0 { value += 0.5 } else { value -= 0.5 } w.device.SetControl(ctrl.CID, int32(value)) w.updateControls() }) return func(value int32) { scale.SetValue(float64(value)) label.SetLabel(strconv.Itoa(int(value))) } } func (w *ControlPanelWindow) createBoolControl(parent *gtk.Container, ctrl v4l.ControlInfo) updater { checkButton, err := gtk.CheckButtonNew() fatal(err) checkButton.SetHExpand(false) checkButton.SetVExpand(false) parent.Add(checkButton) checkButton.Connect("toggled", func() { value := int32(0) if checkButton.GetActive() { value = 1 } w.device.SetControl(ctrl.CID, value) w.updateControls() }) return func(value int32) { active := false if value != 0 { active = true } checkButton.SetActive(active) } } func (w *ControlPanelWindow) createEnumControl(parent *gtk.Container, ctrl v4l.ControlInfo) updater { comboBox, err := gtk.ComboBoxTextNew() fatal(err) parent.Add(comboBox) for _, opt := range ctrl.Options { comboBox.Append("", opt.Name) } comboBox.Connect("changed", func() { value := ctrl.Options[comboBox.GetActive()].Value w.device.SetControl(ctrl.CID, value) w.updateControls() }) return func(value int32) { for i, opt := range ctrl.Options { if opt.Value == value { comboBox.SetActive(i) break } } } } func (w *ControlPanelWindow) createButtonControl(parent *gtk.Container, ctrl v4l.ControlInfo) updater { button, err := gtk.ButtonNewWithLabel(ctrl.Name) fatal(err) parent.Add(button) button.Connect("clicked", func() { w.device.SetControl(ctrl.CID, 0) w.updateControls() }) return nil } func (w *ControlPanelWindow) windowDestroyed() { w.ticker.cancel() if w.device != nil { w.device.Close() } *w = ControlPanelWindow{ DevicePath: w.DevicePath, OnClose: w.OnClose, } w.OnClose() } func (w *ControlPanelWindow) updateControls() { for i, ctrl := range w.controls { if ctrl.Type == "button" { continue } value, err := w.device.GetControl(ctrl.CID) if err != nil { continue } if w.updaters[i] != nil { w.updaters[i](value) } } } func (w *ControlPanelWindow) modalError(prefix string, err error) { msg := prefix + ": " + err.Error() dlg := gtk.MessageDialogNew(w.window, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_CLOSE, msg) dlg.SetTitle("Error") dlg.SetPosition(gtk.WIN_POS_CENTER_ON_PARENT) dlg.Connect("response", dlg.Destroy) dlg.Connect("destroy", w.window.Destroy) dlg.ShowAll() } type ticker struct { interval uint callback func() cancelled bool } func newTicker(interval uint, callback func()) *ticker { t := &ticker{ interval: interval, callback: callback, } glib.TimeoutAdd(interval, t.handler) return t } func (t *ticker) cancel() { t.cancelled = true } func (t *ticker) handler() bool { if t.cancelled { return false } t.callback() return true } func deviceListsEqual(d1, d2 []v4l.DeviceInfo) bool { if len(d1) != len(d2) { return false } for i := range d1 { if d1[i] != d2[i] { return false } } return true } func cfg2str(cfg v4l.DeviceConfig) string { w := cfg.Width h := cfg.Height f := cfg.FPS return fmt.Sprintf("%dx%d @ %.4g FPS", w, h, float64(f.N)/float64(f.D)) } func labelNew(s string) *gtk.Label { l, err := gtk.LabelNew(s) fatal(err) l.SetHAlign(gtk.ALIGN_START) return l } func fatal(err error) { if err != nil { panic(err) } } golang-github-korandiz-v4l-1.1.0/device.go000066400000000000000000000522121454574013400203610ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux // Package v4l is a facade to the Video4Linux video capture interface. package v4l import "syscall" // Control IDs. Devices may have other controls than these, including custom // (driver specific) ones. const ( // Integer controls CtrlBrightness = 0x00980900 CtrlContrast = 0x00980901 CtrlSaturation = 0x00980902 CtrlHue = 0x00980903 CtrlGamma = 0x00980910 CtrlExposure = 0x00980911 CtrlGain = 0x00980913 CtrlWhiteBalance = 0x0098091a CtrlSharpness = 0x0098091b CtrlBacklightCompensation = 0x0098091c // Boolean controls CtrlHFlip = 0x00980914 CtrlVFlip = 0x00980915 CtrlAutoWhiteBalance = 0x0098090c CtrlAutoGain = 0x00980912 CtrlAutoHue = 0x00980919 CtrlAutoBrightness = 0x00980920 // Enums CtrlPowerLineFreq = 0x00980918 PowerLineFreqDisabled = 0 PowerLineFreq50Hz = 1 PowerLineFreq60Hz = 2 PowerLineFreqAuto = 3 // Buttons CtrlDoWhiteBalance = 0x0098090d ) // A Device represents a V4L capture device. type Device struct { *device } // device is the real representation of Device. The extra level of indirection // is there to prevent clients from tampering with the file descriptor and the // buffers. type device struct { path string fd int buffers [][]byte bufIndex uint32 nCaptures uint64 } // noBuffer is the value assinged to device.bufIndex when none of the buffers // contain valid image data. const noBuffer = ^uint32(0) // A DeviceInfo provides information about a capture device. type DeviceInfo struct { // Path is the device path. (e.g. /dev/video0) Path string // DeviceName is the name of the device. (e.g. "Yoyodyne TV/FM") DeviceName string // BusInfo is the location of the device in the system. // (e.g. "PCI:0000:05:06.0") BusInfo string // DriverName is the name of the driver. (e.g. "bttv") DriverName string // DriverVersion contains the three components of the driver's version // number. (e.g. [3]int{1, 2, 3} for version 1.2.3) DriverVersion [3]int // Camera tells if the device is a camera. If false, then this is some other // kind of capture device, e.g. an analog TV tuner. Camera bool } // A DeviceConfig encapsulates the configuration of a capture device. type DeviceConfig struct { // Format is the four-character code (FourCC) of the pixel format, with the // first character at the lowest byte. Format uint32 // Width and Height specify the image dimensions. Width int Height int // FPS specifies the frame rate. FPS Frac } // A BufferInfo provides information about how image data is laid out in a // buffer. type BufferInfo struct { // BufferSize is the number of bytes required to hold an image. For variable // length compressed formats, it's the maximum size an image may take up. BufferSize int // ImageStride is the distance in bytes between the leftmost pixels of // adjacent lines. ImageStride int } // A ControlInfo provides information about a control. type ControlInfo struct { // CID is the identifier of the control. (e.g. 0x00980900) CID uint32 // Name is the name of the control. (e.g. "Brightness") Name string // Type tells what kind of control this is. It's one of "int", "bool", // "enum", "int-enum", or "button". // - The valid values of an integer control are determined by Min, Max, // and Step. // - A boolean control can only have the values 0 and 1, where 0 means // "disabled" and 1 means "enabled". // - Enums can only take values from a predefined set. The values are // identifiers which select one of a few named options. (see Options) // - An "int-enum" is similar to an enum, except that, the options are // 64-bit unsigned integers, rather than strings. // - Buttons perform some action when pushed, and they don't have a value. // Reading the value of a button fails, while setting it to any value is // interpreted as a push. Type string // Min and Max specify the range of values the control can take, and Step is // the smallest change actually affecting the hardware. They are only // meaningful for integer type controls. Min int32 Max int32 Step int32 // Default is the default value of the control. Default int32 // Options is the list of valid values of an enum or int-enum type control. // For other types it's nil. Options []struct { // Value is the identifier of this option. (e.g. 0, 1, 2, etc) Value int32 // Name is the label of this option. Only valid for enum type controls. // (e.g. "50 Hz", "60 Hz", "Auto") Name string // Int64 is the integer value of this option. Only valid for int-enum // type controls. (e.g. 0, 333, 667) Int64 int64 } } // errBadControl is returned by Device.controlInfo when the control is disabled // or of unsupported type. const errBadControl = Error("control disabled or of unsupported type") // Open opens the capture device named by path. If the file is not a capture // device, it fails with ErrWrongDevice. func Open(path string) (*Device, error) { // Open the file. fd, err := syscall.Open(path, syscall.O_RDWR|syscall.O_CLOEXEC, 0) if err != nil { return nil, err } // Check if it's a V4L device. var stat syscall.Stat_t if err := syscall.Fstat(fd, &stat); err != nil { syscall.Close(fd) return nil, err } if stat.Mode&syscall.S_IFCHR == 0 || stat.Rdev>>8 != 81 { syscall.Close(fd) return nil, ErrWrongDevice } // Check if it's a capture device. var c v4l_capability if err := ioctl_querycap(fd, &c); err != nil { syscall.Close(fd) return nil, err } caps := c.capabilities if caps&v4l_capDeviceCaps != 0 { caps = c.deviceCaps } if caps&v4l_capVideoCapture == 0 { syscall.Close(fd) return nil, ErrWrongDevice } d := device{path: path, fd: fd, bufIndex: noBuffer} return &Device{&d}, nil } // Close closes the device, freeing all native resources associated with it. It // stops any capture session in progress, and it may also render the contents of // previously captured buffers unavailable. func (d *Device) Close() { d.TurnOff() syscall.Close(d.fd) d.fd = -1 } // DeviceInfo returns information about the device. func (d *Device) DeviceInfo() (DeviceInfo, error) { // Query capabilities. var c v4l_capability if err := ioctl_querycap(d.fd, &c); err != nil { return DeviceInfo{}, err } // Check if the device is a camera. Cameras do not enumerate any video // standards. s := v4l_standard{index: 0} var cam bool switch err := ioctl_enumstd(d.fd, &s); err { case nil: cam = false case syscall.ENOTTY, syscall.EINVAL: cam = true default: return DeviceInfo{}, err } info := DeviceInfo{ Path: d.path, DeviceName: c.card, BusInfo: c.busInfo, DriverName: c.driver, DriverVersion: [3]int{ int(c.version>>16) & 0xff, int(c.version>>8) & 0xff, int(c.version) & 0xff, }, Camera: cam, } return info, nil } // TurnOn initiates a capture session with the device. It may fail with // ErrUnsupported. While the device is turned on, its configuration cannot be // changed. func (d *Device) TurnOn() error { // Switch to progressive format and reset the colorspace to device default. f := v4l_format_pix{typ: v4l_bufTypeVideoCapture} if err := ioctl_gFmt_pix(d.fd, &f); err != nil { return err } f.fmt.field = v4l_fieldNone f.fmt.colorspace = v4l_colorspaceDefault f.fmt.priv = 0 if err := ioctl_sFmt_pix(d.fd, &f); err != nil { return err } // Reset cropping. cc := v4l_cropcap{typ: v4l_bufTypeVideoCapture} switch err := ioctl_cropcap(d.fd, &cc); err { case nil: c := v4l_crop{ typ: v4l_bufTypeVideoCapture, c: cc.defrect, } switch err := ioctl_sCrop(d.fd, &c); err { case nil: // Success. case syscall.ENOTTY, syscall.EINVAL: // VIDIOC_S_CROP unsupported. default: return err } case syscall.ENOTTY: // No support for cropping. That's okay. default: return err } // Allocate buffers. if err := d.allocBuffers(4); err != nil { return err } // Start streaming I/O. if err := ioctl_streamon(d.fd, v4l_bufTypeVideoCapture); err != nil { d.freeBuffers() return err } return nil } // TurnOff ends the capture session in progress. It does not close the device, // so it can be reused for another session. func (d *Device) TurnOff() { ioctl_streamoff(d.fd, v4l_bufTypeVideoCapture) d.freeBuffers() } // allocBuffers allocates n buffers in device memory, and mmaps and queues them. func (d *Device) allocBuffers(n int) error { // Request buffers. rb := v4l_requestbuffers{ count: uint32(n), typ: v4l_bufTypeVideoCapture, memory: v4l_memoryMmap, } if err := ioctl_reqbufs(d.fd, &rb); err != nil { if err == syscall.EINVAL { // Memory-mapped I/O method unsupported. err = ErrUnsupported } return err } if rb.count == 0 { return Error("out of device memory") } // Map and enqueue the buffers. d.buffers = make([][]byte, 0, rb.count) for i := 0; i < cap(d.buffers); i++ { b := v4l_buffer{ index: uint32(i), typ: v4l_bufTypeVideoCapture, memory: v4l_memoryMmap, } if err := ioctl_querybuf(d.fd, &b); err != nil { d.freeBuffers() return err } buf, err := syscall.Mmap(d.fd, int64(b.offset), int(b.length), syscall.PROT_READ, syscall.MAP_SHARED) if err != nil { d.freeBuffers() return err } d.buffers = append(d.buffers, buf) if err := ioctl_qbuf(d.fd, &b); err != nil { d.freeBuffers() return err } } return nil } // freeBuffers munmaps and frees any buffers allocated in device memory, and // removes all pointers to them. func (d *Device) freeBuffers() { d.bufIndex = noBuffer for i := range d.buffers { syscall.Munmap(d.buffers[i]) d.buffers[i] = nil } d.buffers = nil rb := v4l_requestbuffers{ count: 0, typ: v4l_bufTypeVideoCapture, memory: v4l_memoryMmap, } ioctl_reqbufs(d.fd, &rb) } // Capture grabs the next frame, and returns a new Buffer holding the raw image // data. The device must be turned on for Capture to succeed. A call to Capture // may render the contents of previously captured buffers unavailable. func (d *Device) Capture() (*Buffer, error) { d.nCaptures++ // Enqueue the old buffer (if any). if d.bufIndex != noBuffer { b := v4l_buffer{ typ: v4l_bufTypeVideoCapture, memory: v4l_memoryMmap, index: d.bufIndex, } d.bufIndex = noBuffer if err := ioctl_qbuf(d.fd, &b); err != nil { return nil, err } } // Dequeue a new buffer. b := v4l_buffer{ typ: v4l_bufTypeVideoCapture, memory: v4l_memoryMmap, } if err := ioctl_dqbuf(d.fd, &b); err != nil { return nil, err } d.buffers[b.index] = d.buffers[b.index][:b.bytesused] d.bufIndex = b.index return &Buffer{d.device, d.nCaptures, 0, b.sequence}, nil } // GetConfig returns the current configuration of the device. func (d *Device) GetConfig() (DeviceConfig, error) { // Get format. f := v4l_format_pix{typ: v4l_bufTypeVideoCapture} if err := ioctl_gFmt_pix(d.fd, &f); err != nil { return DeviceConfig{}, err } // Get streaming parameters. p := v4l_streamparm_capture{typ: v4l_bufTypeVideoCapture} if err := ioctl_gParm_capture(d.fd, &p); err != nil { return DeviceConfig{}, err } cfg := DeviceConfig{ Format: f.fmt.pixelformat, Width: int(f.fmt.width), Height: int(f.fmt.height), FPS: Frac{ p.parm.timeperframe.denominator, p.parm.timeperframe.numerator, }, } return cfg, nil } // SetConfig configures the device according to cfg. The configuration actually // applied may be different from what was requested, as drivers are allowed to // adjust the parameters against hardware capabilities (or even completely // ignore them). The configuration cannot be changed while the device is turned // on. func (d *Device) SetConfig(cfg DeviceConfig) error { // Set format. f := v4l_format_pix{ typ: v4l_bufTypeVideoCapture, fmt: v4l_pixFormat{ width: uint32(cfg.Width), height: uint32(cfg.Height), pixelformat: cfg.Format, field: v4l_fieldNone, colorspace: v4l_colorspaceDefault, priv: 0, }, } if err := ioctl_sFmt_pix(d.fd, &f); err != nil { return err } // Set streaming parameters. cfg.FPS = cfg.FPS.Reduce() p := v4l_streamparm_capture{ typ: v4l_bufTypeVideoCapture, parm: v4l_captureparm{ timeperframe: v4l_fract{cfg.FPS.D, cfg.FPS.N}, }, } if err := ioctl_sParm_capture(d.fd, &p); err != nil { return err } return nil } // BufferInfo returns information about how image data is laid out in a buffer. // For the same device configuration it always returns the same value. func (d *Device) BufferInfo() (BufferInfo, error) { f := v4l_format_pix{typ: v4l_bufTypeVideoCapture} if err := ioctl_gFmt_pix(d.fd, &f); err != nil { return BufferInfo{}, err } info := BufferInfo{ BufferSize: int(f.fmt.sizeimage), ImageStride: int(f.fmt.bytesperline), } return info, nil } // ListConfigs returns the configurations supported by the device. func (d *Device) ListConfigs() ([]DeviceConfig, error) { var cfgs []DeviceConfig for fmt := 0; ; fmt++ { fd := v4l_fmtdesc{ index: uint32(fmt), typ: v4l_bufTypeVideoCapture, } if err := ioctl_enumFmt(d.fd, &fd); err != nil { if err != syscall.EINVAL { return nil, err } break } sizes, err := d.enumFrameSizes(fd.pixelformat) if err != nil { return nil, err } for _, sz := range sizes { ivals, err := d.enumFrameIvals(fd.pixelformat, sz.width, sz.height) if err != nil { return nil, err } for _, ival := range ivals { cfg := DeviceConfig{ Format: fd.pixelformat, Width: int(sz.width), Height: int(sz.height), FPS: Frac{ ival.denominator, ival.numerator, }.Reduce(), } cfgs = append(cfgs, cfg) } } } // Some devices/drivers seem to return duplicates. Fix that. n := 0 for i := 0; i < len(cfgs); i++ { dupe := false for j := 0; j < n && !dupe; j++ { dupe = cfgs[i] == cfgs[j] } if !dupe { cfgs[n] = cfgs[i] n++ } } cfgs = cfgs[:n] return cfgs, nil } // enumFrameSizes returns the supported frame sizes. If the device does not // enumerate a discrete set of frame sizes, then a few common ones within the // supported range are returned. func (d *Device) enumFrameSizes(fmt uint32) ([]v4l_frmsizeDiscrete, error) { var ( sizes []v4l_frmsizeDiscrete fs v4l_frmsizeenum ) // Try to enumerate discrete frame sizes. loop: for index := 0; ; index++ { fs = v4l_frmsizeenum{ index: uint32(index), pixelFormat: fmt, } if err := ioctl_enumFramesizes(d.fd, &fs); err != nil { if err != syscall.EINVAL { return nil, err } return sizes, nil } switch fs.typ { case v4l_frmsizeTypeDiscrete: sizes = append(sizes, fs.discrete) case v4l_frmsizeTypeContinuous, v4l_frmsizeTypeStepwise: break loop default: return nil, nil } } // Fall back to a default list. fss := fs.stepwise for _, fsd := range defaultFrameSizes { if fsd.width < fss.minWidth || fsd.width > fss.maxWidth || (fsd.width-fss.minWidth)%fss.stepWidth != 0 { continue } if fsd.height < fss.minHeight || fsd.height > fss.maxHeight || (fsd.height-fss.minHeight)%fss.stepHeight != 0 { continue } sizes = append(sizes, fsd) } sizes = append(sizes, v4l_frmsizeDiscrete{fss.maxWidth, fss.maxHeight}) return sizes, nil } // defaultFrameSizes lists a few common resolutions. var defaultFrameSizes = []v4l_frmsizeDiscrete{ {160, 120}, {176, 144}, {320, 180}, {320, 240}, {352, 288}, {640, 360}, {640, 480}, {800, 600}, {960, 540}, {1024, 768}, {1280, 720}, {1280, 960}, {1600, 1200}, {1920, 1080}, {3840, 2160}, {7680, 4320}, } // enumFrameIvals returns the supported frame intervals. If the device does not // enumerate a discrete set of frame intervals, then a few common ones within // the supported range are returned. func (d *Device) enumFrameIvals(fmt, w, h uint32) ([]v4l_fract, error) { var ( ivals []v4l_fract fi v4l_frmivalenum ) // Try to enumerate discrete frame intervals. loop: for index := 0; ; index++ { fi = v4l_frmivalenum{ index: uint32(index), pixelFormat: fmt, width: w, height: h, } if err := ioctl_enumFrameintervals(d.fd, &fi); err != nil { if err != syscall.EINVAL { return nil, err } return ivals, nil } switch fi.typ { case v4l_frmivalTypeDiscrete: ivals = append(ivals, fi.discrete) case v4l_frmivalTypeContinuous, v4l_frmivalTypeStepwise: break loop default: return nil, nil } } // Fall back to a default list. var ( fis = fi.stepwise min_n = fis.min.numerator min_d = fis.min.denominator max_n = fis.max.numerator max_d = fis.max.denominator ) for _, fid := range defaultFrameIntervals { if fid.numerator*min_d < min_n*fid.denominator || fid.numerator*max_d > max_n*fid.denominator { continue } ivals = append(ivals, fid) } ivals = append(ivals, fis.min) return ivals, nil } // defaultFrameIntervals lists a few common frame intervals. var defaultFrameIntervals = []v4l_fract{ {1, 5}, {1, 10}, {1, 15}, {1, 25}, {1, 30}, {1, 60}, } // ControlInfo returns information about a control. func (d *Device) ControlInfo(cid uint32) (ControlInfo, error) { info, err := d.controlInfo(cid) if err == errBadControl { // Pretend the control does not exist. err = syscall.EINVAL } return info, err } // ListControls returns the ControlInfo for every control the device has. func (d *Device) ListControls() ([]ControlInfo, error) { var ( lastCID uint32 infos []ControlInfo ) for { info, err := d.controlInfo(lastCID | v4l_ctrlFlagNextCtrl) switch err { case nil: infos = append(infos, info) lastCID = info.CID case errBadControl: // Pretend the control does not exist. lastCID = info.CID case syscall.EINVAL: if lastCID == 0 { // No support for v4l_ctrlFlagNextCtrl. // Fall back to legacy method. return d.listControlsLegacy() } return infos, nil default: return nil, err } } } // listControlsLegacy enumerates all controls the device has by querying them // one-by-one rather than using the v4l_ctrlFlagNextCtrl flag. func (d *Device) listControlsLegacy() ([]ControlInfo, error) { var infos []ControlInfo // Standard controls. for cid := uint32(v4l_cidBase); cid < v4l_cidLastp1; cid++ { info, err := d.controlInfo(cid) if err != nil { if err == syscall.EINVAL || err == errBadControl { continue } return nil, err } infos = append(infos, info) } // Custom controls. for cid := uint32(v4l_cidPrivateBase); ; cid++ { info, err := d.controlInfo(cid) if err != nil { if err == syscall.EINVAL { break } if err == errBadControl { continue } return nil, err } infos = append(infos, info) } return infos, nil } // controlInfo returns information about a control. For disabled contorls and // contorls of unsupported type it fails with errBadControl. func (d *device) controlInfo(cid uint32) (ControlInfo, error) { qc := v4l_queryctrl{id: cid} if err := ioctl_queryctrl(d.fd, &qc); err != nil { return ControlInfo{}, err } info := ControlInfo{ CID: qc.id, Name: qc.name, Min: qc.minimum, Max: qc.maximum, Step: qc.step, Default: qc.defaultValue, } if qc.flags&v4l_ctrlFlagDisabled != 0 { return info, errBadControl } switch qc.typ { case v4l_ctrlTypeInteger: info.Type = "int" case v4l_ctrlTypeBoolean: info.Type = "bool" case v4l_ctrlTypeMenu: info.Type = "enum" case v4l_ctrlTypeButton: info.Type = "button" case v4l_ctrlTypeIntegerMenu: info.Type = "int-enum" default: return info, errBadControl } if qc.typ == v4l_ctrlTypeMenu || qc.typ == v4l_ctrlTypeIntegerMenu { for i := qc.minimum; i <= qc.maximum; i++ { qm := v4l_querymenu{ id: qc.id, index: uint32(i), } if err := ioctl_querymenu(d.fd, &qm); err != nil { if err == syscall.EINVAL { continue } return ControlInfo{}, err } opt := struct { Value int32 Name string Int64 int64 }{ Value: int32(qm.index), } if qc.typ == v4l_ctrlTypeMenu { opt.Name = qm.name } else { opt.Int64 = qm.value } info.Options = append(info.Options, opt) } } return info, nil } // GetControl returns the current value of a control. func (d *Device) GetControl(cid uint32) (int32, error) { c := v4l_control{id: cid} if err := ioctl_gCtrl(d.fd, &c); err != nil { return 0, err } return c.value, nil } // SetControl sets the value of a control. func (d *Device) SetControl(cid uint32, value int32) error { c := v4l_control{ id: cid, value: value, } if err := ioctl_sCtrl(d.fd, &c); err != nil { return err } return nil } golang-github-korandiz-v4l-1.1.0/errors.go000066400000000000000000000026671454574013400204470ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l // An Error is simply an error message. type Error string // Error returns e as a string. func (e Error) Error() string { return string(e) } const ( // ErrWrongDevice is returned by Open when attempting to open a file that is // not a V4L capture device. ErrWrongDevice = Error("not a V4L capture device") // ErrUnsupported indicates that an operation failed due to a limitation of // this library. ErrUnsupported = Error("unsupported device or operation") // ErrBufferGone is returned by methods of Buffer when the contents of the // buffer is no longer available. ErrBufferGone = Error("buffer contents not available") ) golang-github-korandiz-v4l-1.1.0/find.go000066400000000000000000000033101454574013400200350ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l import ( "os" "path/filepath" "syscall" ) // FindDevices returns the DeviceInfo for every capture device found in the // system. The paths are always returned in absolute form. func FindDevices() []DeviceInfo { var ( devs = make(map[int]string) dInfos []DeviceInfo ) filepath.Walk("/dev", func(path string, fInfo os.FileInfo, _ error) error { if fInfo == nil || fInfo.Mode()&os.ModeCharDevice == 0 { return nil } var stat syscall.Stat_t if err := syscall.Stat(path, &stat); err != nil { return nil } major, minor := int(stat.Rdev>>8), int(stat.Rdev&255) if major != 81 { return nil } if _, ok := devs[minor]; ok { return nil } dev, err := Open(path) if err != nil { return nil } defer dev.Close() dInfo, err := dev.DeviceInfo() if err != nil { return nil } dInfos = append(dInfos, dInfo) devs[minor] = path return nil }) return dInfos } golang-github-korandiz-v4l-1.1.0/fmt/000077500000000000000000000000001454574013400173575ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/fmt/mjpeg/000077500000000000000000000000001454574013400204615ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/fmt/mjpeg/fourcc.go000066400000000000000000000017571454574013400223030ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . // Package mjpeg just defines the FourCC of the MJPEG format. // // An MJPEG stream is simply a sequence of JPEG images. Use the image/jpeg // package for decoding. package mjpeg const FourCC = 'M' | 'J'<<8 | 'P'<<16 | 'G'<<24 golang-github-korandiz-v4l-1.1.0/fmt/yuyv/000077500000000000000000000000001454574013400203735ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/fmt/yuyv/convert.go000066400000000000000000000110411454574013400223770ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . package yuyv import "image" // ToRGBA aligns r.Min in dst with p in src, and draws the part of src visible // through r over src. // // It's several times faster than the image/draw package. func ToRGBA(dst *image.RGBA, r image.Rectangle, src *Image, p image.Point) { v := p.Sub(r.Min) r = r.Intersect(dst.Rect).Intersect(src.Rect.Sub(v)) p = r.Min.Add(v) if r.Empty() { return } for y := 0; y < r.Dy(); y++ { s := src.Pix[src.PixPairOffset(p.X, p.Y+y):] d := dst.Pix[dst.PixOffset(r.Min.X, r.Min.Y+y):] n := r.Dx() if p.X&1 != 0 { cb := int32(s[1]) - 128 y2 := int32(s[2]) * 0x010101 cr := int32(s[3]) - 128 d[0] = clamp(y2 + 91881*cr) d[1] = clamp(y2 - 22554*cb - 46802*cr) d[2] = clamp(y2 + 116130*cb) d[3] = 255 s = s[4:] d = d[4:] n-- } for x := 0; x < n; x += 2 { y1 := int32(s[2*x+0]) * 0x010101 cb := int32(s[2*x+1]) - 128 y2 := int32(s[2*x+2]) * 0x010101 cr := int32(s[2*x+3]) - 128 d[4*x+0] = clamp(y1 + 91881*cr) d[4*x+1] = clamp(y1 - 22554*cb - 46802*cr) d[4*x+2] = clamp(y1 + 116130*cb) d[4*x+3] = 255 if x < n-1 { d[4*x+4] = clamp(y2 + 91881*cr) d[4*x+5] = clamp(y2 - 22554*cb - 46802*cr) d[4*x+6] = clamp(y2 + 116130*cb) d[4*x+7] = 255 } } } } func clamp(x int32) uint8 { if uint32(x)&0xff000000 == 0 { return uint8(x >> 16) } else { return uint8(^(x >> 31)) } } // ToGray aligns r.Min in dst with p in src, and draws the part of src visible // through r over src. // // It's several times faster than the image/draw package. func ToGray(dst *image.Gray, r image.Rectangle, src *Image, p image.Point) { v := p.Sub(r.Min) r = r.Intersect(dst.Rect).Intersect(src.Rect.Sub(v)) p = r.Min.Add(v) if r.Empty() { return } for y := 0; y < r.Dy(); y++ { s := src.Pix[src.PixPairOffset(p.X, p.Y+y):] d := dst.Pix[dst.PixOffset(r.Min.X, r.Min.Y+y):] n := r.Dx() if p.X&1 != 0 { cb := int32(s[1]) - 128 y2 := int32(s[2]) * 0x010101 cr := int32(s[3]) - 128 r := clamp2(y2 + 91881*cr) g := clamp2(y2 - 22554*cb - 46802*cr) b := clamp2(y2 + 116130*cb) d[0] = uint8((19595*r + 38470*g + 7471*b + 1<<15) >> 24) s = s[4:] d = d[1:] n-- } for x := 0; x < n; x += 2 { y1 := int32(s[2*x+0]) * 0x010101 cb := int32(s[2*x+1]) - 128 y2 := int32(s[2*x+2]) * 0x010101 cr := int32(s[2*x+3]) - 128 r := clamp2(y1 + 91881*cr) g := clamp2(y1 - 22554*cb - 46802*cr) b := clamp2(y1 + 116130*cb) d[x] = uint8((19595*r + 38470*g + 7471*b + 1<<15) >> 24) if x < n-1 { r := clamp2(y2 + 91881*cr) g := clamp2(y2 - 22554*cb - 46802*cr) b := clamp2(y2 + 116130*cb) d[x+1] = uint8((19595*r + 38470*g + 7471*b + 1<<15) >> 24) } } } } func clamp2(x int32) int32 { if uint32(x)&0xff000000 == 0 { return (x >> 8) & 0xffff } else { return ^(x >> 31) & 0xffff } } // ToYCbCr aligns r.Min in dst with p in src, and draws the part of src visible // through r over src. // // Panics if the subsample ratio of dst is not 4:4:4. func ToYCbCr(dst *image.YCbCr, r image.Rectangle, src *Image, p image.Point) { if dst.SubsampleRatio != image.YCbCrSubsampleRatio444 { panic("subsample ratio must be 4:4:4") } v := p.Sub(r.Min) r = r.Intersect(dst.Rect).Intersect(src.Rect.Sub(v)) p = r.Min.Add(v) if r.Empty() { return } for y := 0; y < r.Dy(); y++ { s := src.Pix[src.PixPairOffset(p.X, p.Y+y):] dy := dst.Y[dst.YOffset(r.Min.X, r.Min.Y+y):] dcb := dst.Cb[dst.COffset(r.Min.X, r.Min.Y+y):] dcr := dst.Cr[dst.COffset(r.Min.X, r.Min.Y+y):] n := r.Dx() if p.X&1 != 0 { dy[0], dcb[0], dcr[0] = s[2], s[1], s[3] s = s[4:] dy = dy[1:] dcb = dcb[1:] dcr = dcr[1:] n-- } for x := 0; x < n; x += 2 { dy[x], dcb[x], dcr[x] = s[2*x], s[2*x+1], s[2*x+3] if x < n-1 { dy[x+1], dcb[x+1], dcr[x+1] = s[2*x+2], s[2*x+1], s[2*x+3] } } } } golang-github-korandiz-v4l-1.1.0/fmt/yuyv/image.go000066400000000000000000000067631454574013400220200ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . // Package yuyv provides support for the YUYV format. package yuyv import ( "image" "image/color" ) // FourCC of the YUYV format. const FourCC = 'Y' | 'U'<<8 | 'Y'<<16 | 'V'<<24 // An Image is an in-memory YUYV image. It implements the image.Image interface. type Image struct { // Pix holds the pixel data. Every four bytes corresponds to a pair of // horizontally adjacent pixels. The two pixels have separate luma values // and shared chroma. The sample order is Y0, Cb, Y1, Cr. Pix []uint8 // Stride is the distance in bytes between vertically adjacent pixels. // Line y starts at index (y-Rect.Min.Y)*Stride. Stride int // Rect is the bounds of the image. Rect image.Rectangle } // New returns a new YUYV image with the given bounds. func New(rect image.Rectangle) *Image { l, r := rect.Min.X&^1, (rect.Max.X+1)&^1 w, h := r-l, rect.Dy() return &Image{make([]uint8, 2*w*h), 2 * w, rect} } // ColorModel returns color.YCbCrModel. func (img *Image) ColorModel() color.Model { return color.YCbCrModel } // Bounds returns the bounds of the image. func (img *Image) Bounds() image.Rectangle { return img.Rect } // At returns the color of the pixel at (x, y). func (img *Image) At(x, y int) color.Color { return img.YCbCrAt(x, y) } // YCbCrAt returns the color of the pixel at (x, y). func (img *Image) YCbCrAt(x, y int) color.YCbCr { if !(image.Point{x, y}.In(img.Rect)) { return color.YCbCr{} } return color.YCbCr{ img.Pix[img.YOffset(x, y)], img.Pix[img.CbOffset(x, y)], img.Pix[img.CrOffset(x, y)], } } // YOffset returns the index at which the Y component of the pixel at (x, y) is // located in Pix. func (img *Image) YOffset(x, y int) int { return img.PixPairOffset(x, y) + 2*(x&1) } // CbOffset returns the index at which the Cb component of the pixel at (x, y) // is located in Pix. func (img *Image) CbOffset(x, y int) int { return img.PixPairOffset(x, y) + 1 } // CrOffset returns the index at which the Cr component of the pixel at (x, y) // is located in Pix. func (img *Image) CrOffset(x, y int) int { return img.PixPairOffset(x, y) + 3 } // PixPairOffset returns the index of the first element in Pix that corresponds // to the pixel pair to which (x, y) belongs. func (img *Image) PixPairOffset(x, y int) int { return (y-img.Rect.Min.Y)*img.Stride + (x&^1-img.Rect.Min.X&^1)*2 } // SubImage returns an image representing the portion of img visible through // rect. The returned value shares pixels with the original image. func (img *Image) SubImage(rect image.Rectangle) image.Image { rect = rect.Intersect(img.Rect) if rect.Empty() { return &Image{} } i := img.PixPairOffset(rect.Min.X, rect.Min.Y) return &Image{img.Pix[i:], img.Stride, rect} } // Opaque returns true. func (img *Image) Opaque() bool { return true } golang-github-korandiz-v4l-1.1.0/fmt/yuyv/yuyv_test.go000066400000000000000000000175311454574013400230040ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . package yuyv import ( "image" "image/color" "image/draw" "testing" ) var src = &Image{ Pix: []byte{ // +---+---+---+---+---+---+---+---+ // Y: | x | y | 0 | 0 | // +---+---+---+---+---+---+---+---+ // // +---+---+---+---+---+---+---+---+ // Cb: | x/2 | y | 0 | 0 | 1 | // +---+---+---+---+---+---+---+---+ // // +---+---+---+---+---+---+---+---+ // Cr: | x/2 | y | 1 | 1 | 1 | // +---+---+---+---+---+---+---+---+ 0x00, 0x01, 0x20, 0x07, 0x40, 0x41, 0x60, 0x47, 0x80, 0x81, 0xa0, 0x87, 0xc0, 0xc1, 0xe0, 0xc7, 0xff, 0xff, 0xff, 0x04, 0x09, 0x24, 0x0f, 0x44, 0x49, 0x64, 0x4f, 0x84, 0x89, 0xa4, 0x8f, 0xc4, 0xc9, 0xe4, 0xcf, 0xff, 0xff, 0xff, 0x08, 0x11, 0x28, 0x17, 0x48, 0x51, 0x68, 0x57, 0x88, 0x91, 0xa8, 0x97, 0xc8, 0xd1, 0xe8, 0xd7, 0xff, 0xff, 0xff, 0x0c, 0x19, 0x2c, 0x1f, 0x4c, 0x59, 0x6c, 0x5f, 0x8c, 0x99, 0xac, 0x9f, 0xcc, 0xd9, 0xec, 0xdf, 0xff, 0xff, 0xff, 0x10, 0x21, 0x30, 0x27, 0x50, 0x61, 0x70, 0x67, 0x90, 0xa1, 0xb0, 0xa7, 0xd0, 0xe1, 0xf0, 0xe7, 0xff, 0xff, 0xff, 0x14, 0x29, 0x34, 0x2f, 0x54, 0x69, 0x74, 0x6f, 0x94, 0xa9, 0xb4, 0xaf, 0xd4, 0xe9, 0xf4, 0xef, 0xff, 0xff, 0xff, 0x18, 0x31, 0x38, 0x37, 0x58, 0x71, 0x78, 0x77, 0x98, 0xb1, 0xb8, 0xb7, 0xd8, 0xf1, 0xf8, 0xf7, 0xff, 0xff, 0xff, 0x1c, 0x39, 0x3c, 0x3f, 0x5c, 0x79, 0x7c, 0x7f, 0x9c, 0xb9, 0xbc, 0xbf, 0xdc, 0xf9, 0xfc, 0xff, 0xff, 0xff, 0xff, }, Stride: 19, Rect: image.Rectangle{ Min: image.Point{10, 20}, Max: image.Point{18, 28}, }, } func TestNew(t *testing.T) { // This test never fails explicitly. If it doesn't panic, it's okay. for L := 0; L < 4; L++ { for T := 0; T < 4; T++ { for R := 8; R < 12; R++ { for B := 8; B < 12; B++ { img := New(image.Rect(L, T, R, B)) for y := T; y < B; y++ { for x := L; x < R; x++ { img.At(x, y) } } } } } } } func TestImage(t *testing.T) { for L := src.Rect.Min.X - 4; L < src.Rect.Max.X+4; L++ { for T := src.Rect.Min.Y - 4; T < src.Rect.Max.Y+4; T++ { for R := src.Rect.Min.X - 4; R < src.Rect.Max.X+4; R++ { for B := src.Rect.Min.Y - 4; B < src.Rect.Max.Y+4; B++ { r := image.Rect(L, T, R, B) s := src.SubImage(r) for y := src.Rect.Min.Y - 4; y < src.Rect.Max.Y+4; y++ { for x := src.Rect.Min.X - 4; x < src.Rect.Max.X+4; x++ { p := image.Pt(x, y) c0 := s.At(x, y) c1 := color.YCbCr{} if p.In(r) && p.In(src.Rect) { c1 = expectedAt(x, y) } if c0 != c1 { t.Errorf("got: %v, expected: %v (x=%d, y=%d, r=%v)\n", c0, c1, x, y, r) return } } } } } } } } func TestToRGBA(t *testing.T) { t.Parallel() r0 := image.Rect(-2, -6, 14, 10) for L := r0.Min.X; L < r0.Max.X; L++ { for T := r0.Min.Y; T < r0.Max.Y; T++ { for R := r0.Min.X; R < r0.Max.X; R++ { for B := r0.Min.Y; B < r0.Max.Y; B++ { for X := src.Rect.Min.X - 4; X < src.Rect.Max.X+4; X++ { for Y := src.Rect.Min.Y - 4; Y < src.Rect.Max.Y+4; Y++ { r := image.Rect(L, T, R, B) p := image.Pt(X, Y) dst0 := image.NewRGBA(r0) dst1 := image.NewRGBA(r0) ToRGBA(dst0, r, src, p) draw.Draw(dst1, r, src, p, draw.Over) for x := r0.Min.X; x < r0.Max.X; x++ { for y := r0.Min.Y; y < r0.Max.Y; y++ { c0 := dst0.At(x, y) c1 := dst1.At(x, y) if c0 != c1 { t.Errorf("got: %v, expected: %v (x=%d, y=%d, r=%v, p=%v)\n", c0, c1, x, y, r, p) return } } } } } } } } } } func TestToGray(t *testing.T) { t.Parallel() r0 := image.Rect(-2, -6, 14, 10) for L := r0.Min.X; L < r0.Max.X; L++ { for T := r0.Min.Y; T < r0.Max.Y; T++ { for R := r0.Min.X; R < r0.Max.X; R++ { for B := r0.Min.Y; B < r0.Max.Y; B++ { for X := src.Rect.Min.X - 4; X < src.Rect.Max.X+4; X++ { for Y := src.Rect.Min.Y - 4; Y < src.Rect.Max.Y+4; Y++ { r := image.Rect(L, T, R, B) p := image.Pt(X, Y) dst0 := image.NewGray(r0) dst1 := image.NewGray(r0) ToGray(dst0, r, src, p) draw.Draw(dst1, r, src, p, draw.Over) for x := r0.Min.X; x < r0.Max.X; x++ { for y := r0.Min.Y; y < r0.Max.Y; y++ { c0 := dst0.At(x, y) c1 := dst1.At(x, y) if c0 != c1 { t.Errorf("got: %v, expected: %v (x=%d, y=%d, r=%v, p=%v)\n", c0, c1, x, y, r, p) return } } } } } } } } } } func TestToYCbCr(t *testing.T) { t.Parallel() r0 := image.Rect(-2, -6, 14, 10) for L := r0.Min.X; L < r0.Max.X; L++ { for T := r0.Min.Y; T < r0.Max.Y; T++ { for R := r0.Min.X; R < r0.Max.X; R++ { for B := r0.Min.Y; B < r0.Max.Y; B++ { for X := src.Rect.Min.X - 4; X < src.Rect.Max.X+4; X++ { for Y := src.Rect.Min.Y - 4; Y < src.Rect.Max.Y+4; Y++ { r := image.Rect(L, T, R, B) p := image.Pt(X, Y) d := p.Sub(r.Min) dst := image.NewYCbCr(r0, image.YCbCrSubsampleRatio444) ToYCbCr(dst, r, src, p) for x := r0.Min.X; x < r0.Max.X; x++ { for y := r0.Min.Y; y < r0.Max.Y; y++ { c0 := dst.At(x, y) c1 := color.YCbCr{} if image.Pt(x, y).In(r) && image.Pt(x, y).Add(d).In(src.Rect) { c1 = expectedAt(x+d.X, y+d.Y) } if c0 != c1 { t.Errorf("got: %v, expected: %v (x=%d, y=%d, r=%v, p=%v)\n", c0, c1, x, y, r, p) return } } } } } } } } } } func expectedAt(x, y int) color.YCbCr { x = (x - src.Rect.Min.X) & 7 y = (y - src.Rect.Min.Y) & 7 return color.YCbCr{ Y: byte(x<<5 + y<<2), Cb: byte(x&^1<<5 + y<<3 + 1), Cr: byte(x&^1<<5 + y<<3 + 7), } } func TestRGBConversion(t *testing.T) { var ( ycc = New(image.Rect(0, 0, 2, 1)) rgb1 = image.NewRGBA(ycc.Rect) rgb2 = image.NewRGBA(ycc.Rect) ) for y := 0; y < 256; y++ { for cb := 0; cb < 256; cb++ { for cr := 0; cr < 256; cr++ { var ( y = uint8(y) cb = uint8(cb) cr = uint8(cr) ) ycc.Pix[0] = y ycc.Pix[1] = cb ycc.Pix[2] = y ycc.Pix[3] = cr draw.Draw(rgb1, rgb1.Rect, ycc, ycc.Rect.Min, draw.Over) ToRGBA(rgb2, rgb2.Rect, ycc, ycc.Rect.Min) for i, v := range rgb2.Pix { if v != rgb1.Pix[i] { t.Errorf("got: %v, expected: %v (y=%d, cb=%d, cr=%d)\n", rgb2.Pix, rgb1.Pix, y, cb, cr) return } } } } } } func TestGrayConversion(t *testing.T) { var ( ycc = New(image.Rect(0, 0, 2, 1)) gray1 = image.NewGray(ycc.Rect) gray2 = image.NewGray(ycc.Rect) ) for y := 0; y < 256; y++ { for cb := 0; cb < 256; cb++ { for cr := 0; cr < 256; cr++ { var ( y = uint8(y) cb = uint8(cb) cr = uint8(cr) ) ycc.Pix[0] = y ycc.Pix[1] = cb ycc.Pix[2] = y ycc.Pix[3] = cr draw.Draw(gray1, gray1.Rect, ycc, ycc.Rect.Min, draw.Over) ToGray(gray2, gray2.Rect, ycc, ycc.Rect.Min) for i, v := range gray2.Pix { if v != gray1.Pix[i] { t.Errorf("got: %v, expected: %v (y=%d, cb=%d, cr=%d)\n", gray2.Pix, gray1.Pix, y, cb, cr) return } } } } } } golang-github-korandiz-v4l-1.1.0/frac.go000066400000000000000000000025531454574013400200400ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l // A Frac represents the fractional number N/D. type Frac struct { N uint32 D uint32 } // Cmp returns -1, 0, or 1 if f is less then, equal to, or greater than g, // respectively. func (f Frac) Cmp(g Frac) int { F := uint64(f.N) * uint64(g.D) G := uint64(g.N) * uint64(f.D) switch { case F < G: return -1 case F > G: return 1 default: return 0 } } // Reduce returns f reduced to lowest terms. func (f Frac) Reduce() Frac { gcd, r := f.N, f.D for r != 0 { gcd, r = r, gcd%r } if gcd == 0 { gcd = 1 } return Frac{f.N / gcd, f.D / gcd} } golang-github-korandiz-v4l-1.1.0/frac_test.go000066400000000000000000000076421454574013400211030ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l import "testing" func TestFrac_Reduce(t *testing.T) { var x = []struct{ in, out Frac }{ {Frac{0, 1}, Frac{0, 1}}, {Frac{0, 2}, Frac{0, 1}}, {Frac{0, 3}, Frac{0, 1}}, {Frac{0, 4}, Frac{0, 1}}, {Frac{0, 6}, Frac{0, 1}}, {Frac{0, 12}, Frac{0, 1}}, {Frac{1, 0}, Frac{1, 0}}, {Frac{1, 1}, Frac{1, 1}}, {Frac{1, 2}, Frac{1, 2}}, {Frac{1, 3}, Frac{1, 3}}, {Frac{1, 4}, Frac{1, 4}}, {Frac{1, 6}, Frac{1, 6}}, {Frac{1, 12}, Frac{1, 12}}, {Frac{2, 0}, Frac{1, 0}}, {Frac{2, 1}, Frac{2, 1}}, {Frac{2, 2}, Frac{1, 1}}, {Frac{2, 3}, Frac{2, 3}}, {Frac{2, 4}, Frac{1, 2}}, {Frac{2, 6}, Frac{1, 3}}, {Frac{2, 12}, Frac{1, 6}}, {Frac{3, 0}, Frac{1, 0}}, {Frac{3, 1}, Frac{3, 1}}, {Frac{3, 2}, Frac{3, 2}}, {Frac{3, 3}, Frac{1, 1}}, {Frac{3, 4}, Frac{3, 4}}, {Frac{3, 6}, Frac{1, 2}}, {Frac{3, 12}, Frac{1, 4}}, {Frac{4, 0}, Frac{1, 0}}, {Frac{4, 1}, Frac{4, 1}}, {Frac{4, 2}, Frac{2, 1}}, {Frac{4, 3}, Frac{4, 3}}, {Frac{4, 4}, Frac{1, 1}}, {Frac{4, 6}, Frac{2, 3}}, {Frac{4, 12}, Frac{1, 3}}, {Frac{6, 0}, Frac{1, 0}}, {Frac{6, 1}, Frac{6, 1}}, {Frac{6, 2}, Frac{3, 1}}, {Frac{6, 3}, Frac{2, 1}}, {Frac{6, 4}, Frac{3, 2}}, {Frac{6, 6}, Frac{1, 1}}, {Frac{6, 12}, Frac{1, 2}}, {Frac{12, 0}, Frac{1, 0}}, {Frac{12, 1}, Frac{12, 1}}, {Frac{12, 2}, Frac{6, 1}}, {Frac{12, 3}, Frac{4, 1}}, {Frac{12, 4}, Frac{3, 1}}, {Frac{12, 6}, Frac{2, 1}}, {Frac{12, 12}, Frac{1, 1}}, {Frac{54665710, 239322993}, Frac{54665710, 239322993}}, {Frac{239322993, 54665710}, Frac{239322993, 54665710}}, {Frac{223092870, 1078282205}, Frac{6, 29}}, {Frac{1078282205, 223092870}, Frac{29, 6}}, {Frac{0, 0}, Frac{0, 0}}, } for _, y := range x { out := y.in.Reduce() if out != y.out { t.Errorf("in: %d/%d, out: %d/%d, expected: %d/%d\n", y.in.N, y.in.D, out.N, out.D, y.out.N, y.out.D) } } } func TestFrac_Cmp(t *testing.T) { rel := map[int]string{-1: "<", 0: "=", 1: ">"} var x = [][]Frac{ {Frac{0, 1}, Frac{0, 2}, Frac{0, 3}, Frac{0, 4}, Frac{0, 6}, Frac{0, 12}}, {Frac{1, 12}}, {Frac{1, 6}, Frac{2, 12}}, {Frac{223092870, 1078282205}, Frac{6, 29}}, {Frac{54665710, 239322993}}, {Frac{1, 4}, Frac{3, 12}}, {Frac{1, 3}, Frac{2, 6}, Frac{4, 12}}, {Frac{1, 2}, Frac{2, 4}, Frac{3, 6}, Frac{6, 12}}, {Frac{2, 3}, Frac{4, 6}}, {Frac{3, 4}}, {Frac{1, 1}, Frac{2, 2}, Frac{3, 3}, Frac{4, 4}, Frac{6, 6}, Frac{12, 12}}, {Frac{4, 3}}, {Frac{3, 2}, Frac{6, 4}}, {Frac{2, 1}, Frac{4, 2}, Frac{6, 3}, Frac{12, 6}}, {Frac{3, 1}, Frac{6, 2}, Frac{12, 4}}, {Frac{4, 1}, Frac{12, 3}}, {Frac{239322993, 54665710}}, {Frac{1078282205, 223092870}}, {Frac{6, 1}, Frac{12, 2}}, {Frac{12, 1}}, {Frac{1, 0}, Frac{2, 0}, Frac{3, 0}, Frac{4, 0}, Frac{6, 0}, Frac{12, 0}}, } for i1 := range x { for _, f := range x[i1] { for i2 := range x { for _, g := range x[i2] { var r int if i1 < i2 { r = -1 } else if i1 > i2 { r = 1 } cmp := f.Cmp(g) if cmp != r { t.Errorf("got: %d/%d %s %d/%d, expected: %d/%d %s %d/%d\n", f.N, f.D, rel[cmp], g.N, g.D, f.N, f.D, rel[r], g.N, g.D) } } } } } } golang-github-korandiz-v4l-1.1.0/generate/000077500000000000000000000000001454574013400203635ustar00rootroot00000000000000golang-github-korandiz-v4l-1.1.0/generate/arch_go.c000066400000000000000000000436111454574013400221360ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 int main() { printf("// +build linux\n"); printf("// +build "); fflush(stdout); system("go env GOHOSTARCH"); printf("\n"); printf("/////////////////////////////////////////////////////\n"); printf("// //\n"); printf("// !!! THIS IS A GENERATED FILE, DO NOT EDIT !!! //\n"); printf("// //\n"); printf("/////////////////////////////////////////////////////\n"); printf("\n"); printf("package v4l\n\n"); printf("const (\n"); printf("\tvidioc_querycap = 0x%08llx\n", (long long unsigned) VIDIOC_QUERYCAP); printf("\tvidioc_gFmt = 0x%08llx\n", (long long unsigned) VIDIOC_G_FMT); printf("\tvidioc_sFmt = 0x%08llx\n", (long long unsigned) VIDIOC_S_FMT); printf("\tvidioc_gParm = 0x%08llx\n", (long long unsigned) VIDIOC_G_PARM); printf("\tvidioc_sParm = 0x%08llx\n", (long long unsigned) VIDIOC_S_PARM); printf("\tvidioc_reqbufs = 0x%08llx\n", (long long unsigned) VIDIOC_REQBUFS); printf("\tvidioc_querybuf = 0x%08llx\n", (long long unsigned) VIDIOC_QUERYBUF); printf("\tvidioc_qbuf = 0x%08llx\n", (long long unsigned) VIDIOC_QBUF); printf("\tvidioc_dqbuf = 0x%08llx\n", (long long unsigned) VIDIOC_DQBUF); printf("\tvidioc_streamon = 0x%08llx\n", (long long unsigned) VIDIOC_STREAMON); printf("\tvidioc_streamoff = 0x%08llx\n", (long long unsigned) VIDIOC_STREAMOFF); printf("\tvidioc_cropcap = 0x%08llx\n", (long long unsigned) VIDIOC_CROPCAP); printf("\tvidioc_sCrop = 0x%08llx\n", (long long unsigned) VIDIOC_S_CROP); printf("\tvidioc_enumstd = 0x%08llx\n", (long long unsigned) VIDIOC_ENUMSTD); printf("\tvidioc_enumFmt = 0x%08llx\n", (long long unsigned) VIDIOC_ENUM_FMT); printf("\tvidioc_enumFramesizes = 0x%08llx\n", (long long unsigned) VIDIOC_ENUM_FRAMESIZES); printf("\tvidioc_enumFrameintervals = 0x%08llx\n", (long long unsigned) VIDIOC_ENUM_FRAMEINTERVALS); printf("\tvidioc_queryctrl = 0x%08llx\n", (long long unsigned) VIDIOC_QUERYCTRL); printf("\tvidioc_querymenu = 0x%08llx\n", (long long unsigned) VIDIOC_QUERYMENU); printf("\tvidioc_gCtrl = 0x%08llx\n", (long long unsigned) VIDIOC_G_CTRL); printf("\tvidioc_sCtrl = 0x%08llx\n", (long long unsigned) VIDIOC_S_CTRL); printf(")\n\n"); printf("const (\n"); printf("\tsize_capability = %llu\n", (long long unsigned) sizeof(struct v4l2_capability)); printf("\tsize_format = %llu\n", (long long unsigned) sizeof(struct v4l2_format)); printf("\tsize_streamparm = %llu\n", (long long unsigned) sizeof(struct v4l2_streamparm)); printf("\tsize_requestbuffers = %llu\n", (long long unsigned) sizeof(struct v4l2_requestbuffers)); printf("\tsize_buffer = %llu\n", (long long unsigned) sizeof(struct v4l2_buffer)); printf("\tsize_int = %llu\n", (long long unsigned) sizeof(int)); printf("\tsize_cropcap = %llu\n", (long long unsigned) sizeof(struct v4l2_cropcap)); printf("\tsize_crop = %llu\n", (long long unsigned) sizeof(struct v4l2_crop)); printf("\tsize_standard = %llu\n", (long long unsigned) sizeof(struct v4l2_standard)); printf("\tsize_fmtdesc = %llu\n", (long long unsigned) sizeof(struct v4l2_fmtdesc)); printf("\tsize_frmsizeenum = %llu\n", (long long unsigned) sizeof(struct v4l2_frmsizeenum)); printf("\tsize_frmivalenum = %llu\n", (long long unsigned) sizeof(struct v4l2_frmivalenum)); printf("\tsize_queryctrl = %llu\n", (long long unsigned) sizeof(struct v4l2_queryctrl)); printf("\tsize_querymenu = %llu\n", (long long unsigned) sizeof(struct v4l2_querymenu)); printf("\tsize_control = %llu\n", (long long unsigned) sizeof(struct v4l2_control)); printf(")\n\n"); printf("const (\n"); printf("\toffs_capability_driver = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, driver)); printf("\tsize_capability_driver = %llu\n", (long long unsigned) sizeof((struct v4l2_capability){0}.driver)); printf("\toffs_capability_card = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, card)); printf("\tsize_capability_card = %llu\n", (long long unsigned) sizeof((struct v4l2_capability){0}.card)); printf("\toffs_capability_busInfo = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, bus_info)); printf("\tsize_capability_busInfo = %llu\n", (long long unsigned) sizeof((struct v4l2_capability){0}.bus_info)); printf("\toffs_capability_version = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, version)); printf("\toffs_capability_capabilities = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, capabilities)); printf("\toffs_capability_deviceCaps = %llu\n", (long long unsigned) offsetof(struct v4l2_capability, device_caps)); printf(")\n\n"); printf("const (\n"); printf("\toffs_format_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_format, type)); printf("\toffs_format_fmt = %llu\n", (long long unsigned) offsetof(struct v4l2_format, fmt)); printf(")\n\n"); printf("const (\n"); printf("\toffs_pixFormat_width = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, width)); printf("\toffs_pixFormat_height = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, height)); printf("\toffs_pixFormat_pixelformat = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, pixelformat)); printf("\toffs_pixFormat_field = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, field)); printf("\toffs_pixFormat_bytesperline = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, bytesperline)); printf("\toffs_pixFormat_sizeimage = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, sizeimage)); printf("\toffs_pixFormat_colorspace = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, colorspace)); printf("\toffs_pixFormat_priv = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, priv)); printf("\toffs_pixFormat_flags = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, flags)); printf("\toffs_pixFormat_ycbcrEnc = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, ycbcr_enc)); printf("\toffs_pixFormat_quantization = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, quantization)); printf("\toffs_pixFormat_xferFunc = %llu\n", (long long unsigned) offsetof(struct v4l2_pix_format, xfer_func)); printf(")\n\n"); printf("const (\n"); printf("\toffs_streamparm_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_streamparm, type)); printf("\toffs_streamparm_parm = %llu\n", (long long unsigned) offsetof(struct v4l2_streamparm, parm)); printf(")\n\n"); printf("const (\n"); printf("\toffs_captureparm_capability = %llu\n", (long long unsigned) offsetof(struct v4l2_captureparm, capability)); printf("\toffs_captureparm_capturemode = %llu\n", (long long unsigned) offsetof(struct v4l2_captureparm, capturemode)); printf("\toffs_captureparm_timeperframe = %llu\n", (long long unsigned) offsetof(struct v4l2_captureparm, timeperframe)); printf("\toffs_captureparm_extendedmode = %llu\n", (long long unsigned) offsetof(struct v4l2_captureparm, extendedmode)); printf("\toffs_captureparm_readbuffers = %llu\n", (long long unsigned) offsetof(struct v4l2_captureparm, readbuffers)); printf(")\n\n"); printf("const (\n"); printf("\toffs_requestbuffers_count = %llu\n", (long long unsigned) offsetof(struct v4l2_requestbuffers, count)); printf("\toffs_requestbuffers_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_requestbuffers, type)); printf("\toffs_requestbuffers_memory = %llu\n", (long long unsigned) offsetof(struct v4l2_requestbuffers, memory)); printf(")\n\n"); printf("const (\n"); printf("\toffs_buffer_index = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, index)); printf("\toffs_buffer_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, type)); printf("\toffs_buffer_bytesused = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, bytesused)); printf("\toffs_buffer_flags = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, flags)); printf("\toffs_buffer_field = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, field)); printf("\toffs_buffer_timecode = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, timecode)); printf("\toffs_buffer_sequence = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, sequence)); printf("\toffs_buffer_memory = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, memory)); printf("\toffs_buffer_offset = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, m.offset)); printf("\toffs_buffer_length = %llu\n", (long long unsigned) offsetof(struct v4l2_buffer, length)); printf(")\n\n"); printf("const (\n"); printf("\toffs_cropcap_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_cropcap, type)); printf("\toffs_cropcap_bounds = %llu\n", (long long unsigned) offsetof(struct v4l2_cropcap, bounds)); printf("\toffs_cropcap_defrect = %llu\n", (long long unsigned) offsetof(struct v4l2_cropcap, defrect)); printf("\toffs_cropcap_pixelaspect = %llu\n", (long long unsigned) offsetof(struct v4l2_cropcap, pixelaspect)); printf(")\n\n"); printf("const (\n"); printf("\toffs_crop_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_crop, type)); printf("\toffs_crop_c = %llu\n", (long long unsigned) offsetof(struct v4l2_crop, c)); printf(")\n\n"); printf("const (\n"); printf("\toffs_fract_numerator = %llu\n", (long long unsigned) offsetof(struct v4l2_fract, numerator)); printf("\toffs_fract_denominator = %llu\n", (long long unsigned) offsetof(struct v4l2_fract, denominator)); printf(")\n\n"); printf("const (\n"); printf("\toffs_timecode_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, type)); printf("\toffs_timecode_flags = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, flags)); printf("\toffs_timecode_frames = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, frames)); printf("\toffs_timecode_seconds = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, seconds)); printf("\toffs_timecode_minutes = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, minutes)); printf("\toffs_timecode_hours = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, hours)); printf("\toffs_timecode_userbits = %llu\n", (long long unsigned) offsetof(struct v4l2_timecode, userbits)); printf(")\n\n"); printf("const (\n"); printf("\toffs_rect_left = %llu\n", (long long unsigned) offsetof(struct v4l2_rect, left)); printf("\toffs_rect_top = %llu\n", (long long unsigned) offsetof(struct v4l2_rect, top)); printf("\toffs_rect_width = %llu\n", (long long unsigned) offsetof(struct v4l2_rect, width)); printf("\toffs_rect_height = %llu\n", (long long unsigned) offsetof(struct v4l2_rect, height)); printf(")\n\n"); printf("const (\n"); printf("\toffs_standard_index = %llu\n", (long long unsigned) offsetof(struct v4l2_standard, index)); printf("\toffs_standard_id = %llu\n", (long long unsigned) offsetof(struct v4l2_standard, id)); printf("\toffs_standard_name = %llu\n", (long long unsigned) offsetof(struct v4l2_standard, name)); printf("\tsize_standard_name = %llu\n", (long long unsigned) sizeof((struct v4l2_standard){0}.name)); printf("\toffs_standard_frameperiod = %llu\n", (long long unsigned) offsetof(struct v4l2_standard, frameperiod)); printf("\toffs_standard_framelines = %llu\n", (long long unsigned) offsetof(struct v4l2_standard, framelines)); printf(")\n\n"); printf("const (\n"); printf("\toffs_fmtdesc_index = %llu\n", (long long unsigned) offsetof(struct v4l2_fmtdesc, index)); printf("\toffs_fmtdesc_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_fmtdesc, type)); printf("\toffs_fmtdesc_flags = %llu\n", (long long unsigned) offsetof(struct v4l2_fmtdesc, flags)); printf("\toffs_fmtdesc_description = %llu\n", (long long unsigned) offsetof(struct v4l2_fmtdesc, description)); printf("\tsize_fmtdesc_description = %llu\n", (long long unsigned) sizeof((struct v4l2_fmtdesc){0}.description)); printf("\toffs_fmtdesc_pixelformat = %llu\n", (long long unsigned) offsetof(struct v4l2_fmtdesc, pixelformat)); printf(")\n\n"); printf("const (\n"); printf("\toffs_frmsizeenum_index = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsizeenum, index)); printf("\toffs_frmsizeenum_pixelFormat = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsizeenum, pixel_format)); printf("\toffs_frmsizeenum_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsizeenum, type)); printf("\toffs_frmsizeenum_discrete = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsizeenum, discrete)); printf("\toffs_frmsizeenum_stepwise = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsizeenum, stepwise)); printf(")\n\n"); printf("const (\n"); printf("\toffs_frmsizeDiscrete_width = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_discrete, width)); printf("\toffs_frmsizeDiscrete_height = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_discrete, height)); printf(")\n\n"); printf("const (\n"); printf("\toffs_frmsizeStepwise_minWidth = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, min_width)); printf("\toffs_frmsizeStepwise_maxWidth = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, max_width)); printf("\toffs_frmsizeStepwise_stepWidth = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, step_width)); printf("\toffs_frmsizeStepwise_minHeight = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, min_height)); printf("\toffs_frmsizeStepwise_maxHeight = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, max_height)); printf("\toffs_frmsizeStepwise_stepHeight = %llu\n", (long long unsigned) offsetof(struct v4l2_frmsize_stepwise, step_height)); printf(")\n\n"); printf("const (\n"); printf("\toffs_frmivalenum_index = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, index)); printf("\toffs_frmivalenum_pixelFormat = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, pixel_format)); printf("\toffs_frmivalenum_width = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, width)); printf("\toffs_frmivalenum_height = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, height)); printf("\toffs_frmivalenum_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, type)); printf("\toffs_frmivalenum_discrete = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, discrete)); printf("\toffs_frmivalenum_stepwise = %llu\n", (long long unsigned) offsetof(struct v4l2_frmivalenum, stepwise)); printf(")\n\n"); printf("const (\n"); printf("\toffs_frmivalStepwise_min = %llu\n", (long long unsigned) offsetof(struct v4l2_frmival_stepwise, min)); printf("\toffs_frmivalStepwise_max = %llu\n", (long long unsigned) offsetof(struct v4l2_frmival_stepwise, max)); printf("\toffs_frmivalStepwise_step = %llu\n", (long long unsigned) offsetof(struct v4l2_frmival_stepwise, step)); printf(")\n\n"); printf("const (\n"); printf("\toffs_queryctrl_id = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, id)); printf("\toffs_queryctrl_typ = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, type)); printf("\toffs_queryctrl_name = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, name)); printf("\tsize_queryctrl_name = %llu\n", (long long unsigned) sizeof((struct v4l2_queryctrl){0}.name)); printf("\toffs_queryctrl_minimum = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, minimum)); printf("\toffs_queryctrl_maximum = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, maximum)); printf("\toffs_queryctrl_step = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, step)); printf("\toffs_queryctrl_defaultValue = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, default_value)); printf("\toffs_queryctrl_flags = %llu\n", (long long unsigned) offsetof(struct v4l2_queryctrl, flags)); printf(")\n\n"); printf("const (\n"); printf("\toffs_querymenu_id = %llu\n", (long long unsigned) offsetof(struct v4l2_querymenu, id)); printf("\toffs_querymenu_index = %llu\n", (long long unsigned) offsetof(struct v4l2_querymenu, index)); printf("\toffs_querymenu_name = %llu\n", (long long unsigned) offsetof(struct v4l2_querymenu, name)); printf("\tsize_querymenu_name = %llu\n", (long long unsigned) sizeof((struct v4l2_querymenu){0}.name)); printf("\toffs_querymenu_value = %llu\n", (long long unsigned) offsetof(struct v4l2_querymenu, value)); printf(")\n\n"); printf("const (\n"); printf("\toffs_control_id = %llu\n", (long long unsigned) offsetof(struct v4l2_control, id)); printf("\toffs_control_value = %llu\n", (long long unsigned) offsetof(struct v4l2_control, value)); printf(")\n"); return 0; } golang-github-korandiz-v4l-1.1.0/go.mod000066400000000000000000000000501454574013400176720ustar00rootroot00000000000000module github.com/korandiz/v4l go 1.15 golang-github-korandiz-v4l-1.1.0/v4l.go000066400000000000000000000571071454574013400176370ustar00rootroot00000000000000// Package v4l, a facade to the Video4Linux video capture interface // Copyright (C) 2016 Zoltán Korándi // // 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 . //go:build linux // +build linux package v4l import ( "syscall" "unsafe" ) // Constants. const ( v4l_capVideoCapture = 0x00000001 v4l_capDeviceCaps = 0x80000000 ) const ( v4l_bufTypeVideoCapture = 1 ) const ( v4l_colorspaceDefault = 0 ) const ( v4l_fieldNone = 1 ) const ( v4l_memoryMmap = 1 ) const ( v4l_frmsizeTypeDiscrete = 1 v4l_frmsizeTypeContinuous = 2 v4l_frmsizeTypeStepwise = 3 ) const ( v4l_frmivalTypeDiscrete = 1 v4l_frmivalTypeContinuous = 2 v4l_frmivalTypeStepwise = 3 ) const ( v4l_ctrlFlagDisabled = 0x0001 v4l_ctrlFlagNextCtrl = 0x80000000 ) const ( v4l_ctrlTypeInteger = 1 v4l_ctrlTypeBoolean = 2 v4l_ctrlTypeMenu = 3 v4l_ctrlTypeButton = 4 v4l_ctrlTypeIntegerMenu = 9 ) const ( v4l_cidBase = 0x00980900 v4l_cidLastp1 = 0x0098092b v4l_cidPrivateBase = 0x08000000 ) // Structs. type v4l_capability struct { driver string card string busInfo string version uint32 capabilities uint32 deviceCaps uint32 } type v4l_format_pix struct { typ uint32 fmt v4l_pixFormat } type v4l_pixFormat struct { width uint32 height uint32 pixelformat uint32 field uint32 bytesperline uint32 sizeimage uint32 colorspace uint32 priv uint32 flags uint32 ycbcrEnc uint32 quantization uint32 xferFunc uint32 } type v4l_streamparm_capture struct { typ uint32 parm v4l_captureparm } type v4l_captureparm struct { capability uint32 capturemode uint32 timeperframe v4l_fract extendedmode uint32 readbuffers uint32 } type v4l_requestbuffers struct { count uint32 typ uint32 memory uint32 } type v4l_buffer struct { index uint32 typ uint32 bytesused uint32 flags uint32 field uint32 timecode v4l_timecode sequence uint32 memory uint32 offset uint32 length uint32 } type v4l_int int32 type v4l_cropcap struct { typ uint32 bounds v4l_rect defrect v4l_rect pixelaspect v4l_fract } type v4l_crop struct { typ uint32 c v4l_rect } type v4l_fract struct { numerator uint32 denominator uint32 } type v4l_timecode struct { typ uint32 flags uint32 frames uint8 seconds uint8 minutes uint8 hours uint8 userbits [4]uint8 } type v4l_rect struct { left int32 top int32 width uint32 height uint32 } type v4l_standard struct { index uint32 id uint64 name string frameperiod v4l_fract framelines uint32 } type v4l_fmtdesc struct { index uint32 typ uint32 flags uint32 description string pixelformat uint32 } type v4l_frmsizeenum struct { index uint32 pixelFormat uint32 typ uint32 discrete v4l_frmsizeDiscrete stepwise v4l_frmsizeStepwise } type v4l_frmsizeDiscrete struct { width uint32 height uint32 } type v4l_frmsizeStepwise struct { minWidth uint32 maxWidth uint32 stepWidth uint32 minHeight uint32 maxHeight uint32 stepHeight uint32 } type v4l_frmivalenum struct { index uint32 pixelFormat uint32 width uint32 height uint32 typ uint32 discrete v4l_fract stepwise v4l_frmivalStepwise } type v4l_frmivalStepwise struct { min v4l_fract max v4l_fract step v4l_fract } type v4l_queryctrl struct { id uint32 typ uint32 name string minimum int32 maximum int32 step int32 defaultValue int32 flags uint32 } type v4l_querymenu struct { id uint32 index uint32 name string value int64 } type v4l_control struct { id uint32 value int32 } // IOCTLs. func ioctl_querycap(fd int, argp *v4l_capability) error { return ioctl(fd, vidioc_querycap, argp) } func ioctl_gFmt_pix(fd int, argp *v4l_format_pix) error { return ioctl(fd, vidioc_gFmt, argp) } func ioctl_sFmt_pix(fd int, argp *v4l_format_pix) error { return ioctl(fd, vidioc_sFmt, argp) } func ioctl_gParm_capture(fd int, argp *v4l_streamparm_capture) error { return ioctl(fd, vidioc_gParm, argp) } func ioctl_sParm_capture(fd int, argp *v4l_streamparm_capture) error { return ioctl(fd, vidioc_sParm, argp) } func ioctl_reqbufs(fd int, argp *v4l_requestbuffers) error { return ioctl(fd, vidioc_reqbufs, argp) } func ioctl_querybuf(fd int, argp *v4l_buffer) error { return ioctl(fd, vidioc_querybuf, argp) } func ioctl_qbuf(fd int, argp *v4l_buffer) error { return ioctl(fd, vidioc_qbuf, argp) } func ioctl_dqbuf(fd int, argp *v4l_buffer) error { return ioctl(fd, vidioc_dqbuf, argp) } func ioctl_streamon(fd int, typ v4l_int) error { return ioctl(fd, vidioc_streamon, &typ) } func ioctl_streamoff(fd int, typ v4l_int) error { return ioctl(fd, vidioc_streamoff, &typ) } func ioctl_cropcap(fd int, argp *v4l_cropcap) error { return ioctl(fd, vidioc_cropcap, argp) } func ioctl_sCrop(fd int, argp *v4l_crop) error { return ioctl(fd, vidioc_sCrop, argp) } func ioctl_enumstd(fd int, argp *v4l_standard) error { return ioctl(fd, vidioc_enumstd, argp) } func ioctl_enumFmt(fd int, argp *v4l_fmtdesc) error { return ioctl(fd, vidioc_enumFmt, argp) } func ioctl_enumFramesizes(fd int, argp *v4l_frmsizeenum) error { return ioctl(fd, vidioc_enumFramesizes, argp) } func ioctl_enumFrameintervals(fd int, argp *v4l_frmivalenum) error { return ioctl(fd, vidioc_enumFrameintervals, argp) } func ioctl_queryctrl(fd int, argp *v4l_queryctrl) error { return ioctl(fd, vidioc_queryctrl, argp) } func ioctl_querymenu(fd int, argp *v4l_querymenu) error { return ioctl(fd, vidioc_querymenu, argp) } func ioctl_gCtrl(fd int, argp *v4l_control) error { return ioctl(fd, vidioc_gCtrl, argp) } func ioctl_sCtrl(fd int, argp *v4l_control) error { return ioctl(fd, vidioc_sCtrl, argp) } func ioctl(fd int, request uint, argp ioctlArg) error { buf := make([]uint64, (argp.size()+7)/8) p := unsafe.Pointer(&buf[0]) argp.put(p) _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), uintptr(request), uintptr(p)) if err != 0 { return err } argp.get(p) return nil } // Getters and putters. type ioctlArg interface { get(unsafe.Pointer) put(unsafe.Pointer) size() int } func (p *v4l_capability) get(q unsafe.Pointer) { p.driver = getString(q, offs_capability_driver, size_capability_driver) p.card = getString(q, offs_capability_card, size_capability_card) p.busInfo = getString(q, offs_capability_busInfo, size_capability_busInfo) p.version = getUint32(q, offs_capability_version) p.capabilities = getUint32(q, offs_capability_capabilities) p.deviceCaps = getUint32(q, offs_capability_deviceCaps) } func (p *v4l_capability) put(q unsafe.Pointer) { putString(q, offs_capability_driver, size_capability_driver, p.driver) putString(q, offs_capability_card, size_capability_card, p.card) putString(q, offs_capability_busInfo, size_capability_busInfo, p.busInfo) putUint32(q, offs_capability_version, p.version) putUint32(q, offs_capability_capabilities, p.capabilities) putUint32(q, offs_capability_deviceCaps, p.deviceCaps) } func (p *v4l_capability) size() int { return size_capability } func (p *v4l_format_pix) get(q unsafe.Pointer) { p.typ = getUint32(q, offs_format_typ) p.fmt.get(unsafe.Pointer(uintptr(q) + offs_format_fmt)) } func (p *v4l_format_pix) put(q unsafe.Pointer) { putUint32(q, offs_format_typ, p.typ) p.fmt.put(unsafe.Pointer(uintptr(q) + offs_format_fmt)) } func (p *v4l_format_pix) size() int { return size_format } func (p *v4l_pixFormat) get(q unsafe.Pointer) { p.width = getUint32(q, offs_pixFormat_width) p.height = getUint32(q, offs_pixFormat_height) p.pixelformat = getUint32(q, offs_pixFormat_pixelformat) p.field = getUint32(q, offs_pixFormat_field) p.bytesperline = getUint32(q, offs_pixFormat_bytesperline) p.sizeimage = getUint32(q, offs_pixFormat_sizeimage) p.colorspace = getUint32(q, offs_pixFormat_colorspace) p.priv = getUint32(q, offs_pixFormat_priv) p.flags = getUint32(q, offs_pixFormat_flags) p.ycbcrEnc = getUint32(q, offs_pixFormat_ycbcrEnc) p.quantization = getUint32(q, offs_pixFormat_quantization) p.xferFunc = getUint32(q, offs_pixFormat_xferFunc) } func (p *v4l_pixFormat) put(q unsafe.Pointer) { putUint32(q, offs_pixFormat_width, p.width) putUint32(q, offs_pixFormat_height, p.height) putUint32(q, offs_pixFormat_pixelformat, p.pixelformat) putUint32(q, offs_pixFormat_field, p.field) putUint32(q, offs_pixFormat_bytesperline, p.bytesperline) putUint32(q, offs_pixFormat_sizeimage, p.sizeimage) putUint32(q, offs_pixFormat_colorspace, p.colorspace) putUint32(q, offs_pixFormat_priv, p.priv) putUint32(q, offs_pixFormat_flags, p.flags) putUint32(q, offs_pixFormat_ycbcrEnc, p.ycbcrEnc) putUint32(q, offs_pixFormat_quantization, p.quantization) putUint32(q, offs_pixFormat_xferFunc, p.xferFunc) } func (p *v4l_streamparm_capture) get(q unsafe.Pointer) { p.typ = getUint32(q, offs_streamparm_typ) p.parm.get(unsafe.Pointer(uintptr(q) + offs_streamparm_parm)) } func (p *v4l_streamparm_capture) put(q unsafe.Pointer) { putUint32(q, offs_streamparm_typ, p.typ) p.parm.put(unsafe.Pointer(uintptr(q) + offs_streamparm_parm)) } func (p *v4l_streamparm_capture) size() int { return size_streamparm } func (p *v4l_captureparm) get(q unsafe.Pointer) { p.capability = getUint32(q, offs_captureparm_capability) p.capturemode = getUint32(q, offs_captureparm_capturemode) p.timeperframe.get(unsafe.Pointer(uintptr(q) + offs_captureparm_timeperframe)) p.extendedmode = getUint32(q, offs_captureparm_extendedmode) p.readbuffers = getUint32(q, offs_captureparm_readbuffers) } func (p *v4l_captureparm) put(q unsafe.Pointer) { putUint32(q, offs_captureparm_capability, p.capability) putUint32(q, offs_captureparm_capturemode, p.capturemode) p.timeperframe.put(unsafe.Pointer(uintptr(q) + offs_captureparm_timeperframe)) putUint32(q, offs_captureparm_extendedmode, p.extendedmode) putUint32(q, offs_captureparm_readbuffers, p.readbuffers) } func (p *v4l_requestbuffers) get(q unsafe.Pointer) { p.count = getUint32(q, offs_requestbuffers_count) p.typ = getUint32(q, offs_requestbuffers_typ) p.memory = getUint32(q, offs_requestbuffers_memory) } func (p *v4l_requestbuffers) put(q unsafe.Pointer) { putUint32(q, offs_requestbuffers_count, p.count) putUint32(q, offs_requestbuffers_typ, p.typ) putUint32(q, offs_requestbuffers_memory, p.memory) } func (p *v4l_requestbuffers) size() int { return size_requestbuffers } func (p *v4l_buffer) get(q unsafe.Pointer) { p.index = getUint32(q, offs_buffer_index) p.typ = getUint32(q, offs_buffer_typ) p.bytesused = getUint32(q, offs_buffer_bytesused) p.flags = getUint32(q, offs_buffer_flags) p.field = getUint32(q, offs_buffer_field) p.timecode.get(unsafe.Pointer(uintptr(q) + offs_buffer_timecode)) p.sequence = getUint32(q, offs_buffer_sequence) p.memory = getUint32(q, offs_buffer_memory) p.offset = getUint32(q, offs_buffer_offset) p.length = getUint32(q, offs_buffer_length) } func (p *v4l_buffer) put(q unsafe.Pointer) { putUint32(q, offs_buffer_index, p.index) putUint32(q, offs_buffer_typ, p.typ) putUint32(q, offs_buffer_bytesused, p.bytesused) putUint32(q, offs_buffer_flags, p.flags) putUint32(q, offs_buffer_field, p.field) p.timecode.put(unsafe.Pointer(uintptr(q) + offs_buffer_timecode)) putUint32(q, offs_buffer_sequence, p.sequence) putUint32(q, offs_buffer_memory, p.memory) putUint32(q, offs_buffer_offset, p.offset) putUint32(q, offs_buffer_length, p.length) } func (p *v4l_buffer) size() int { return size_buffer } func (p *v4l_int) get(q unsafe.Pointer) { *p = v4l_int(getInt(q, 0)) } func (p *v4l_int) put(q unsafe.Pointer) { putInt(q, 0, int32(*p)) } func (p *v4l_int) size() int { return size_int } func (p *v4l_cropcap) get(q unsafe.Pointer) { p.typ = getUint32(q, offs_cropcap_typ) p.bounds.get(unsafe.Pointer(uintptr(q) + offs_cropcap_bounds)) p.defrect.get(unsafe.Pointer(uintptr(q) + offs_cropcap_defrect)) p.pixelaspect.get(unsafe.Pointer(uintptr(q) + offs_cropcap_pixelaspect)) } func (p *v4l_cropcap) put(q unsafe.Pointer) { putUint32(q, offs_cropcap_typ, p.typ) p.bounds.put(unsafe.Pointer(uintptr(q) + offs_cropcap_bounds)) p.defrect.put(unsafe.Pointer(uintptr(q) + offs_cropcap_defrect)) p.pixelaspect.put(unsafe.Pointer(uintptr(q) + offs_cropcap_pixelaspect)) } func (p *v4l_cropcap) size() int { return size_cropcap } func (p *v4l_crop) get(q unsafe.Pointer) { p.typ = getUint32(q, offs_crop_typ) p.c.get(unsafe.Pointer(uintptr(q) + offs_crop_c)) } func (p *v4l_crop) put(q unsafe.Pointer) { putUint32(q, offs_crop_typ, p.typ) p.c.put(unsafe.Pointer(uintptr(q) + offs_crop_c)) } func (p *v4l_crop) size() int { return size_crop } func (p *v4l_fract) get(q unsafe.Pointer) { p.numerator = getUint32(q, offs_fract_numerator) p.denominator = getUint32(q, offs_fract_denominator) } func (p *v4l_fract) put(q unsafe.Pointer) { putUint32(q, offs_fract_numerator, p.numerator) putUint32(q, offs_fract_denominator, p.denominator) } func (p *v4l_timecode) get(q unsafe.Pointer) { p.typ = getUint32(q, offs_timecode_typ) p.flags = getUint32(q, offs_timecode_flags) p.frames = getUint8(q, offs_timecode_frames) p.seconds = getUint8(q, offs_timecode_seconds) p.minutes = getUint8(q, offs_timecode_minutes) p.hours = getUint8(q, offs_timecode_hours) for i := range p.userbits { p.userbits[i] = getUint8(q, offs_timecode_userbits+i) } } func (p *v4l_timecode) put(q unsafe.Pointer) { putUint32(q, offs_timecode_typ, p.typ) putUint32(q, offs_timecode_flags, p.flags) putUint8(q, offs_timecode_frames, p.frames) putUint8(q, offs_timecode_seconds, p.seconds) putUint8(q, offs_timecode_minutes, p.minutes) putUint8(q, offs_timecode_hours, p.hours) for i := range p.userbits { putUint8(q, offs_timecode_userbits+i, p.userbits[i]) } } func (p *v4l_rect) get(q unsafe.Pointer) { p.left = getInt32(q, offs_rect_left) p.top = getInt32(q, offs_rect_top) p.width = getUint32(q, offs_rect_width) p.height = getUint32(q, offs_rect_height) } func (p *v4l_rect) put(q unsafe.Pointer) { putInt32(q, offs_rect_left, p.left) putInt32(q, offs_rect_top, p.top) putUint32(q, offs_rect_width, p.width) putUint32(q, offs_rect_height, p.height) } func (p *v4l_standard) get(q unsafe.Pointer) { p.index = getUint32(q, offs_standard_index) p.id = getUint64(q, offs_standard_id) p.name = getString(q, offs_standard_name, size_standard_name) p.frameperiod.get(unsafe.Pointer(uintptr(q) + offs_standard_frameperiod)) p.framelines = getUint32(q, offs_standard_framelines) } func (p *v4l_standard) put(q unsafe.Pointer) { putUint32(q, offs_standard_index, p.index) putUint64(q, offs_standard_id, p.id) putString(q, offs_standard_name, size_standard_name, p.name) p.frameperiod.put(unsafe.Pointer(uintptr(q) + offs_standard_frameperiod)) putUint32(q, offs_standard_framelines, p.framelines) } func (p *v4l_standard) size() int { return size_standard } func (p *v4l_fmtdesc) get(q unsafe.Pointer) { p.index = getUint32(q, offs_fmtdesc_index) p.typ = getUint32(q, offs_fmtdesc_typ) p.flags = getUint32(q, offs_fmtdesc_flags) p.description = getString(q, offs_fmtdesc_description, size_fmtdesc_description) p.pixelformat = getUint32(q, offs_fmtdesc_pixelformat) } func (p *v4l_fmtdesc) put(q unsafe.Pointer) { putUint32(q, offs_fmtdesc_index, p.index) putUint32(q, offs_fmtdesc_typ, p.typ) putUint32(q, offs_fmtdesc_flags, p.flags) putString(q, offs_fmtdesc_description, size_fmtdesc_description, p.description) putUint32(q, offs_fmtdesc_pixelformat, p.pixelformat) } func (p *v4l_fmtdesc) size() int { return size_fmtdesc } func (p *v4l_frmsizeenum) get(q unsafe.Pointer) { p.index = getUint32(q, offs_frmsizeenum_index) p.pixelFormat = getUint32(q, offs_frmsizeenum_pixelFormat) p.typ = getUint32(q, offs_frmsizeenum_typ) p.discrete.get(unsafe.Pointer(uintptr(q) + offs_frmsizeenum_discrete)) p.stepwise.get(unsafe.Pointer(uintptr(q) + offs_frmsizeenum_stepwise)) } func (p *v4l_frmsizeenum) put(q unsafe.Pointer) { putUint32(q, offs_frmsizeenum_index, p.index) putUint32(q, offs_frmsizeenum_pixelFormat, p.pixelFormat) putUint32(q, offs_frmsizeenum_typ, p.typ) switch p.typ { case v4l_frmsizeTypeDiscrete: p.discrete.put(unsafe.Pointer(uintptr(q) + offs_frmsizeenum_discrete)) case v4l_frmsizeTypeContinuous, v4l_frmsizeTypeStepwise: p.stepwise.put(unsafe.Pointer(uintptr(q) + offs_frmsizeenum_stepwise)) } } func (p *v4l_frmsizeenum) size() int { return size_frmsizeenum } func (p *v4l_frmsizeDiscrete) get(q unsafe.Pointer) { p.width = getUint32(q, offs_frmsizeDiscrete_width) p.height = getUint32(q, offs_frmsizeDiscrete_height) } func (p *v4l_frmsizeDiscrete) put(q unsafe.Pointer) { putUint32(q, offs_frmsizeDiscrete_width, p.width) putUint32(q, offs_frmsizeDiscrete_height, p.height) } func (p *v4l_frmsizeStepwise) get(q unsafe.Pointer) { p.minWidth = getUint32(q, offs_frmsizeStepwise_minWidth) p.maxWidth = getUint32(q, offs_frmsizeStepwise_maxWidth) p.stepWidth = getUint32(q, offs_frmsizeStepwise_stepWidth) p.minHeight = getUint32(q, offs_frmsizeStepwise_minHeight) p.maxHeight = getUint32(q, offs_frmsizeStepwise_maxHeight) p.stepHeight = getUint32(q, offs_frmsizeStepwise_stepHeight) } func (p *v4l_frmsizeStepwise) put(q unsafe.Pointer) { putUint32(q, offs_frmsizeStepwise_minWidth, p.minWidth) putUint32(q, offs_frmsizeStepwise_maxWidth, p.maxWidth) putUint32(q, offs_frmsizeStepwise_stepWidth, p.stepWidth) putUint32(q, offs_frmsizeStepwise_minHeight, p.minHeight) putUint32(q, offs_frmsizeStepwise_maxHeight, p.maxHeight) putUint32(q, offs_frmsizeStepwise_stepHeight, p.stepHeight) } func (p *v4l_frmivalenum) get(q unsafe.Pointer) { p.index = getUint32(q, offs_frmivalenum_index) p.pixelFormat = getUint32(q, offs_frmivalenum_pixelFormat) p.width = getUint32(q, offs_frmivalenum_width) p.height = getUint32(q, offs_frmivalenum_height) p.typ = getUint32(q, offs_frmivalenum_typ) p.discrete.get(unsafe.Pointer(uintptr(q) + offs_frmivalenum_discrete)) p.stepwise.get(unsafe.Pointer(uintptr(q) + offs_frmivalenum_stepwise)) } func (p *v4l_frmivalenum) put(q unsafe.Pointer) { putUint32(q, offs_frmivalenum_index, p.index) putUint32(q, offs_frmivalenum_pixelFormat, p.pixelFormat) putUint32(q, offs_frmivalenum_width, p.width) putUint32(q, offs_frmivalenum_height, p.height) putUint32(q, offs_frmivalenum_typ, p.typ) switch p.typ { case v4l_frmivalTypeDiscrete: p.discrete.put(unsafe.Pointer(uintptr(q) + offs_frmivalenum_discrete)) case v4l_frmivalTypeContinuous, v4l_frmivalTypeStepwise: p.stepwise.put(unsafe.Pointer(uintptr(q) + offs_frmivalenum_stepwise)) } } func (p *v4l_frmivalenum) size() int { return size_frmivalenum } func (p *v4l_frmivalStepwise) get(q unsafe.Pointer) { p.min.get(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_min)) p.max.get(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_max)) p.step.get(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_step)) } func (p *v4l_frmivalStepwise) put(q unsafe.Pointer) { p.min.put(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_min)) p.max.put(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_max)) p.step.put(unsafe.Pointer(uintptr(q) + offs_frmivalStepwise_step)) } func (p *v4l_queryctrl) get(q unsafe.Pointer) { p.id = getUint32(q, offs_queryctrl_id) p.typ = getUint32(q, offs_queryctrl_typ) p.name = getString(q, offs_queryctrl_name, size_queryctrl_name) p.minimum = getInt32(q, offs_queryctrl_minimum) p.maximum = getInt32(q, offs_queryctrl_maximum) p.step = getInt32(q, offs_queryctrl_step) p.defaultValue = getInt32(q, offs_queryctrl_defaultValue) p.flags = getUint32(q, offs_queryctrl_flags) } func (p *v4l_queryctrl) put(q unsafe.Pointer) { putUint32(q, offs_queryctrl_id, p.id) putUint32(q, offs_queryctrl_typ, p.typ) putString(q, offs_queryctrl_name, size_queryctrl_name, p.name) putInt32(q, offs_queryctrl_minimum, p.minimum) putInt32(q, offs_queryctrl_maximum, p.maximum) putInt32(q, offs_queryctrl_step, p.step) putInt32(q, offs_queryctrl_defaultValue, p.defaultValue) putUint32(q, offs_queryctrl_flags, p.flags) } func (p *v4l_queryctrl) size() int { return size_queryctrl } func (p *v4l_querymenu) get(q unsafe.Pointer) { p.id = getUint32(q, offs_querymenu_id) p.index = getUint32(q, offs_querymenu_index) p.name = getString(q, offs_querymenu_name, size_querymenu_name) p.value = getInt64(q, offs_querymenu_value) } func (p *v4l_querymenu) put(q unsafe.Pointer) { putUint32(q, offs_querymenu_id, p.id) putUint32(q, offs_querymenu_index, p.index) } func (p *v4l_querymenu) size() int { return size_querymenu } func (p *v4l_control) get(q unsafe.Pointer) { p.id = getUint32(q, offs_control_id) p.value = getInt32(q, offs_control_value) } func (p *v4l_control) put(q unsafe.Pointer) { putUint32(q, offs_control_id, p.id) putInt32(q, offs_control_value, p.value) } func (p *v4l_control) size() int { return size_control } // Getters and putters for built-in types. func getUint64(base unsafe.Pointer, offset int) uint64 { ptr := (*uint64)(unsafe.Pointer(uintptr(base) + uintptr(offset))) return *ptr } func putUint64(base unsafe.Pointer, offset int, value uint64) { ptr := (*uint64)(unsafe.Pointer(uintptr(base) + uintptr(offset))) *ptr = value } func getInt64(base unsafe.Pointer, offset int) int64 { ptr := (*int64)(unsafe.Pointer(uintptr(base) + uintptr(offset))) return *ptr } func putInt64(base unsafe.Pointer, offset int, value int64) { ptr := (*int64)(unsafe.Pointer(uintptr(base) + uintptr(offset))) *ptr = value } func getUint32(base unsafe.Pointer, offset int) uint32 { ptr := (*uint32)(unsafe.Pointer(uintptr(base) + uintptr(offset))) return *ptr } func putUint32(base unsafe.Pointer, offset int, value uint32) { ptr := (*uint32)(unsafe.Pointer(uintptr(base) + uintptr(offset))) *ptr = value } func getInt32(base unsafe.Pointer, offset int) int32 { ptr := (*int32)(unsafe.Pointer(uintptr(base) + uintptr(offset))) return *ptr } func putInt32(base unsafe.Pointer, offset int, value int32) { ptr := (*int32)(unsafe.Pointer(uintptr(base) + uintptr(offset))) *ptr = value } func getUint8(base unsafe.Pointer, offset int) uint8 { ptr := (*uint8)(unsafe.Pointer(uintptr(base) + uintptr(offset))) return *ptr } func putUint8(base unsafe.Pointer, offset int, value uint8) { ptr := (*uint8)(unsafe.Pointer(uintptr(base) + uintptr(offset))) *ptr = value } func getInt(base unsafe.Pointer, offset int) int64 { p := unsafe.Pointer(uintptr(base) + uintptr(offset)) switch size_int { case 4: return int64(*(*uint32)(p)) case 8: return *(*int64)(p) default: panic("bad int size") } } func putInt(base unsafe.Pointer, offset int, value int32) { p := unsafe.Pointer(uintptr(base) + uintptr(offset)) switch size_int { case 4: *(*int32)(p) = value case 8: *(*int64)(p) = int64(value) default: panic("bad int size") } } func getString(base unsafe.Pointer, offset, maxLen int) string { buf := make([]byte, 0, maxLen) for i := 0; i < maxLen; i++ { ptr := (*byte)(unsafe.Pointer(uintptr(base) + uintptr(offset+i))) ch := *ptr if ch == 0 { break } buf = append(buf, ch) } return string(buf) } func putString(base unsafe.Pointer, offset, maxLen int, value string) { for i := 0; i < maxLen; i++ { ptr := (*byte)(unsafe.Pointer(uintptr(base) + uintptr(offset+i))) var ch byte if i < len(value) && i != maxLen-1 { ch = value[i] } *ptr = ch } }