/* Copyright (C) 2014 by Leonhard Oelke This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 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 . */ #pragma once #include #include #include #include #ifdef __cplusplus extern "C" { #endif /** * Data structure for mapped buffers */ struct v4l2_mmap_info { /** length of the mapped buffer */ size_t length; /** start address of the mapped buffer */ void *start; }; /** * Data structure for buffer info */ struct v4l2_buffer_data { /** number of mapped buffers */ uint_fast32_t count; /** memory info for mapped buffers */ struct v4l2_mmap_info *info; }; /** * Convert v4l2 pixel format to obs video format * * @param format v4l2 format id * * @return obs video_format id */ static inline enum video_format v4l2_to_obs_video_format(uint_fast32_t format) { switch (format) { case V4L2_PIX_FMT_YVYU: return VIDEO_FORMAT_YVYU; case V4L2_PIX_FMT_YUYV: return VIDEO_FORMAT_YUY2; case V4L2_PIX_FMT_UYVY: return VIDEO_FORMAT_UYVY; case V4L2_PIX_FMT_NV12: return VIDEO_FORMAT_NV12; case V4L2_PIX_FMT_YUV420: return VIDEO_FORMAT_I420; case V4L2_PIX_FMT_YVU420: return VIDEO_FORMAT_I420; #ifdef V4L2_PIX_FMT_XBGR32 case V4L2_PIX_FMT_XBGR32: return VIDEO_FORMAT_BGRX; #endif #ifdef V4L2_PIX_FMT_ABGR32 case V4L2_PIX_FMT_ABGR32: return VIDEO_FORMAT_BGRA; #endif default: return VIDEO_FORMAT_NONE; } } /** * Fixed framesizes for devices that don't support enumerating discrete values. * * The framesizes in this array are packed, the width encoded in the high word * and the height in the low word. * The array is terminated with a zero. */ static const int v4l2_framesizes[] = { /* 4:3 */ 160<<16 | 120, 320<<16 | 240, 480<<16 | 320, 640<<16 | 480, 800<<16 | 600, 1024<<16 | 768, 1280<<16 | 960, 1440<<16 | 1050, 1440<<16 | 1080, 1600<<16 | 1200, /* 16:9 */ 640<<16 | 360, 960<<16 | 540, 1280<<16 | 720, 1600<<16 | 900, 1920<<16 | 1080, 1920<<16 | 1200, 2560<<16 | 1440, 3840<<16 | 2160, /* 21:9 */ 2560<<16 | 1080, 3440<<16 | 1440, 5120<<16 | 2160, /* tv */ 432<<16 | 520, 480<<16 | 320, 480<<16 | 530, 486<<16 | 440, 576<<16 | 310, 576<<16 | 520, 576<<16 | 570, 720<<16 | 576, 1024<<16 | 576, 0 }; /** * Fixed framerates for devices that don't support enumerating discrete values. * * The framerates in this array are packed, the numerator encoded in the high * word and the denominator in the low word. * The array is terminated with a zero. */ static const int v4l2_framerates[] = { 1<<16 | 60, 1<<16 | 50, 1<<16 | 30, 1<<16 | 25, 1<<16 | 20, 1<<16 | 15, 1<<16 | 10, 1<<16 | 5, 0 }; /** * Pack two integer values into one * * Obviously the input integers have to be truncated in order to fit into * one. The effective 16bits left are still enough to handle resolutions and * framerates just fine. * * @param a integer one * @param b integer two * * @return the packed integer */ static inline int v4l2_pack_tuple(int a, int b) { return (a << 16) | (b & 0xffff); } /** * Unpack two integer values from one * * @see v4l2_pack_tuple * * @param a pointer to integer a * @param b pointer to integer b * @param packed the packed integer */ static void v4l2_unpack_tuple(int *a, int *b, int packed) { *a = packed >> 16; *b = packed & 0xffff; } /** * Start the video capture on the device. * * This enqueues the memory mapped buffers and instructs the device to start * the video stream. * * @param dev handle for the v4l2 device * @param buf buffer data * * @return negative on failure */ int_fast32_t v4l2_start_capture(int_fast32_t dev, struct v4l2_buffer_data *buf); /** * Stop the video capture on the device. * * @param dev handle for the v4l2 device * * @return negative on failure */ int_fast32_t v4l2_stop_capture(int_fast32_t dev); /** * Create memory mapping for buffers * * This tries to map at least 2, preferably 4, buffers to application memory. * * @param dev handle for the v4l2 device * @param buf buffer data * * @return negative on failure */ int_fast32_t v4l2_create_mmap(int_fast32_t dev, struct v4l2_buffer_data *buf); /** * Destroy the memory mapping for buffers * * @param buf buffer data * * @return negative on failure */ int_fast32_t v4l2_destroy_mmap(struct v4l2_buffer_data *buf); /** * Set the video input on the device. * * If the action succeeds input is set to the currently selected input. * * @param dev handle for the v4l2 device * @param input index of the input or -1 to leave it as is * * @return negative on failure */ int_fast32_t v4l2_set_input(int_fast32_t dev, int *input); /** * Get capabilities for an input. * * @param dev handle for the v4l2 device * @param input index of the input or -1 to use the currently selected * @param caps capabilities for the input * * @return negative on failure */ int_fast32_t v4l2_get_input_caps(int_fast32_t dev, int input, uint32_t *caps); /** * Set the video format on the device. * * If the action succeeds resolution, pixelformat and bytesperline are set * to the used values. * * @param dev handle for the v4l2 device * @param resolution packed value of the resolution or -1 to leave as is * @param pixelformat index of the pixelformat or -1 to leave as is * @param bytesperline this will be set accordingly on success * * @return negative on failure */ int_fast32_t v4l2_set_format(int_fast32_t dev, int *resolution, int *pixelformat, int *bytesperline); /** * Set the framerate on the device. * * If the action succeeds framerate is set to the used value. * * @param dev handle to the v4l2 device * @param framerate packed value of the framerate or -1 to leave as is * * @return negative on failure */ int_fast32_t v4l2_set_framerate(int_fast32_t dev, int *framerate); /** * Set a video standard on the device. * * If the action succeeds standard is set to the used video standard id. * * @param dev handle to the v4l2 device * @param standard id of the standard to use or -1 to leave as is * * @return negative on failure */ int_fast32_t v4l2_set_standard(int_fast32_t dev, int *standard); /** * Get the dv timing for an input with a specified index * * @param dev handle to the v4l2 device * @param dvt pointer to the timing structure to fill * @param index index of the dv timing to fetch * * @return negative on failure */ int_fast32_t v4l2_enum_dv_timing(int_fast32_t dev, struct v4l2_dv_timings *dvt, int index); /** * Set a dv timing on the device * * Currently standard will not be changed on success or error. * * @param dev handle to the v4l2 device * @param timing index of the timing to use or -1 to leave as is * * @return negative on failure */ int_fast32_t v4l2_set_dv_timing(int_fast32_t dev, int *timing); #ifdef __cplusplus } #endif