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  1. /*
  2.  * AVFoundation input device
  3.  * Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * AVFoundation input device
  25.  * @author Thilo Borgmann <thilo.borgmann@mail.de>
  26.  */
  27.  
  28. #import <AVFoundation/AVFoundation.h>
  29. #include <pthread.h>
  30.  
  31. #include "libavutil/pixdesc.h"
  32. #include "libavutil/opt.h"
  33. #include "libavutil/avstring.h"
  34. #include "libavformat/internal.h"
  35. #include "libavutil/internal.h"
  36. #include "libavutil/parseutils.h"
  37. #include "libavutil/time.h"
  38. #include "avdevice.h"
  39.  
  40. static const int avf_time_base = 1000000;
  41.  
  42. static const AVRational avf_time_base_q = {
  43.     .num = 1,
  44.     .den = avf_time_base
  45. };
  46.  
  47. struct AVFPixelFormatSpec {
  48.     enum AVPixelFormat ff_id;
  49.     OSType avf_id;
  50. };
  51.  
  52. static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
  53.     { AV_PIX_FMT_MONOBLACK,    kCVPixelFormatType_1Monochrome },
  54.     { AV_PIX_FMT_RGB555BE,     kCVPixelFormatType_16BE555 },
  55.     { AV_PIX_FMT_RGB555LE,     kCVPixelFormatType_16LE555 },
  56.     { AV_PIX_FMT_RGB565BE,     kCVPixelFormatType_16BE565 },
  57.     { AV_PIX_FMT_RGB565LE,     kCVPixelFormatType_16LE565 },
  58.     { AV_PIX_FMT_RGB24,        kCVPixelFormatType_24RGB },
  59.     { AV_PIX_FMT_BGR24,        kCVPixelFormatType_24BGR },
  60.     { AV_PIX_FMT_0RGB,         kCVPixelFormatType_32ARGB },
  61.     { AV_PIX_FMT_BGR0,         kCVPixelFormatType_32BGRA },
  62.     { AV_PIX_FMT_0BGR,         kCVPixelFormatType_32ABGR },
  63.     { AV_PIX_FMT_RGB0,         kCVPixelFormatType_32RGBA },
  64.     { AV_PIX_FMT_BGR48BE,      kCVPixelFormatType_48RGB },
  65.     { AV_PIX_FMT_UYVY422,      kCVPixelFormatType_422YpCbCr8 },
  66.     { AV_PIX_FMT_YUVA444P,     kCVPixelFormatType_4444YpCbCrA8R },
  67.     { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
  68.     { AV_PIX_FMT_YUV444P,      kCVPixelFormatType_444YpCbCr8 },
  69.     { AV_PIX_FMT_YUV422P16,    kCVPixelFormatType_422YpCbCr16 },
  70.     { AV_PIX_FMT_YUV422P10,    kCVPixelFormatType_422YpCbCr10 },
  71.     { AV_PIX_FMT_YUV444P10,    kCVPixelFormatType_444YpCbCr10 },
  72.     { AV_PIX_FMT_YUV420P,      kCVPixelFormatType_420YpCbCr8Planar },
  73.     { AV_PIX_FMT_NV12,         kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
  74.     { AV_PIX_FMT_YUYV422,      kCVPixelFormatType_422YpCbCr8_yuvs },
  75. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
  76.     { AV_PIX_FMT_GRAY8,        kCVPixelFormatType_OneComponent8 },
  77. #endif
  78.     { AV_PIX_FMT_NONE, 0 }
  79. };
  80.  
  81. typedef struct
  82. {
  83.     AVClass*        class;
  84.  
  85.     int             frames_captured;
  86.     int             audio_frames_captured;
  87.     int64_t         first_pts;
  88.     int64_t         first_audio_pts;
  89.     pthread_mutex_t frame_lock;
  90.     pthread_cond_t  frame_wait_cond;
  91.     id              avf_delegate;
  92.     id              avf_audio_delegate;
  93.  
  94.     AVRational      framerate;
  95.     int             width, height;
  96.  
  97.     int             capture_cursor;
  98.     int             capture_mouse_clicks;
  99.  
  100.     int             list_devices;
  101.     int             video_device_index;
  102.     int             video_stream_index;
  103.     int             audio_device_index;
  104.     int             audio_stream_index;
  105.  
  106.     char            *video_filename;
  107.     char            *audio_filename;
  108.  
  109.     int             num_video_devices;
  110.  
  111.     int             audio_channels;
  112.     int             audio_bits_per_sample;
  113.     int             audio_float;
  114.     int             audio_be;
  115.     int             audio_signed_integer;
  116.     int             audio_packed;
  117.     int             audio_non_interleaved;
  118.  
  119.     int32_t         *audio_buffer;
  120.     int             audio_buffer_size;
  121.  
  122.     enum AVPixelFormat pixel_format;
  123.  
  124.     AVCaptureSession         *capture_session;
  125.     AVCaptureVideoDataOutput *video_output;
  126.     AVCaptureAudioDataOutput *audio_output;
  127.     CMSampleBufferRef         current_frame;
  128.     CMSampleBufferRef         current_audio_frame;
  129. } AVFContext;
  130.  
  131. static void lock_frames(AVFContext* ctx)
  132. {
  133.     pthread_mutex_lock(&ctx->frame_lock);
  134. }
  135.  
  136. static void unlock_frames(AVFContext* ctx)
  137. {
  138.     pthread_mutex_unlock(&ctx->frame_lock);
  139. }
  140.  
  141. /** FrameReciever class - delegate for AVCaptureSession
  142.  */
  143. @interface AVFFrameReceiver : NSObject
  144. {
  145.     AVFContext* _context;
  146. }
  147.  
  148. - (id)initWithContext:(AVFContext*)context;
  149.  
  150. - (void)  captureOutput:(AVCaptureOutput *)captureOutput
  151.   didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
  152.          fromConnection:(AVCaptureConnection *)connection;
  153.  
  154. @end
  155.  
  156. @implementation AVFFrameReceiver
  157.  
  158. - (id)initWithContext:(AVFContext*)context
  159. {
  160.     if (self = [super init]) {
  161.         _context = context;
  162.     }
  163.     return self;
  164. }
  165.  
  166. - (void)  captureOutput:(AVCaptureOutput *)captureOutput
  167.   didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
  168.          fromConnection:(AVCaptureConnection *)connection
  169. {
  170.     lock_frames(_context);
  171.  
  172.     if (_context->current_frame != nil) {
  173.         CFRelease(_context->current_frame);
  174.     }
  175.  
  176.     _context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);
  177.  
  178.     pthread_cond_signal(&_context->frame_wait_cond);
  179.  
  180.     unlock_frames(_context);
  181.  
  182.     ++_context->frames_captured;
  183. }
  184.  
  185. @end
  186.  
  187. /** AudioReciever class - delegate for AVCaptureSession
  188.  */
  189. @interface AVFAudioReceiver : NSObject
  190. {
  191.     AVFContext* _context;
  192. }
  193.  
  194. - (id)initWithContext:(AVFContext*)context;
  195.  
  196. - (void)  captureOutput:(AVCaptureOutput *)captureOutput
  197.   didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
  198.          fromConnection:(AVCaptureConnection *)connection;
  199.  
  200. @end
  201.  
  202. @implementation AVFAudioReceiver
  203.  
  204. - (id)initWithContext:(AVFContext*)context
  205. {
  206.     if (self = [super init]) {
  207.         _context = context;
  208.     }
  209.     return self;
  210. }
  211.  
  212. - (void)  captureOutput:(AVCaptureOutput *)captureOutput
  213.   didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
  214.          fromConnection:(AVCaptureConnection *)connection
  215. {
  216.     lock_frames(_context);
  217.  
  218.     if (_context->current_audio_frame != nil) {
  219.         CFRelease(_context->current_audio_frame);
  220.     }
  221.  
  222.     _context->current_audio_frame = (CMSampleBufferRef)CFRetain(audioFrame);
  223.  
  224.     pthread_cond_signal(&_context->frame_wait_cond);
  225.  
  226.     unlock_frames(_context);
  227.  
  228.     ++_context->audio_frames_captured;
  229. }
  230.  
  231. @end
  232.  
  233. static void destroy_context(AVFContext* ctx)
  234. {
  235.     [ctx->capture_session stopRunning];
  236.  
  237.     [ctx->capture_session release];
  238.     [ctx->video_output    release];
  239.     [ctx->audio_output    release];
  240.     [ctx->avf_delegate    release];
  241.     [ctx->avf_audio_delegate release];
  242.  
  243.     ctx->capture_session = NULL;
  244.     ctx->video_output    = NULL;
  245.     ctx->audio_output    = NULL;
  246.     ctx->avf_delegate    = NULL;
  247.     ctx->avf_audio_delegate = NULL;
  248.  
  249.     av_freep(&ctx->audio_buffer);
  250.  
  251.     pthread_mutex_destroy(&ctx->frame_lock);
  252.     pthread_cond_destroy(&ctx->frame_wait_cond);
  253.  
  254.     if (ctx->current_frame) {
  255.         CFRelease(ctx->current_frame);
  256.     }
  257. }
  258.  
  259. static void parse_device_name(AVFormatContext *s)
  260. {
  261.     AVFContext *ctx = (AVFContext*)s->priv_data;
  262.     char *tmp = av_strdup(s->filename);
  263.     char *save;
  264.  
  265.     if (tmp[0] != ':') {
  266.         ctx->video_filename = av_strtok(tmp,  ":", &save);
  267.         ctx->audio_filename = av_strtok(NULL, ":", &save);
  268.     } else {
  269.         ctx->audio_filename = av_strtok(tmp,  ":", &save);
  270.     }
  271. }
  272.  
  273. /**
  274.  * Configure the video device.
  275.  *
  276.  * Configure the video device using a run-time approach to access properties
  277.  * since formats, activeFormat are available since  iOS >= 7.0 or OSX >= 10.7
  278.  * and activeVideoMaxFrameDuration is available since i0S >= 7.0 and OSX >= 10.9.
  279.  *
  280.  * The NSUndefinedKeyException must be handled by the caller of this function.
  281.  *
  282.  */
  283. static int configure_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
  284. {
  285.     AVFContext *ctx = (AVFContext*)s->priv_data;
  286.  
  287.     double framerate = av_q2d(ctx->framerate);
  288.     NSObject *range = nil;
  289.     NSObject *format = nil;
  290.     NSObject *selected_range = nil;
  291.     NSObject *selected_format = nil;
  292.  
  293.     for (format in [video_device valueForKey:@"formats"]) {
  294.         CMFormatDescriptionRef formatDescription;
  295.         CMVideoDimensions dimensions;
  296.  
  297.         formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
  298.         dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
  299.  
  300.         if ((ctx->width == 0 && ctx->height == 0) ||
  301.             (dimensions.width == ctx->width && dimensions.height == ctx->height)) {
  302.  
  303.             selected_format = format;
  304.  
  305.             for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
  306.                 double max_framerate;
  307.  
  308.                 [[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
  309.                 if (fabs (framerate - max_framerate) < 0.01) {
  310.                     selected_range = range;
  311.                     break;
  312.                 }
  313.             }
  314.         }
  315.     }
  316.  
  317.     if (!selected_format) {
  318.         av_log(s, AV_LOG_ERROR, "Selected video size (%dx%d) is not supported by the device\n",
  319.             ctx->width, ctx->height);
  320.         goto unsupported_format;
  321.     }
  322.  
  323.     if (!selected_range) {
  324.         av_log(s, AV_LOG_ERROR, "Selected framerate (%f) is not supported by the device\n",
  325.             framerate);
  326.         goto unsupported_format;
  327.     }
  328.  
  329.     if ([video_device lockForConfiguration:NULL] == YES) {
  330.         NSValue *min_frame_duration = [selected_range valueForKey:@"minFrameDuration"];
  331.  
  332.         [video_device setValue:selected_format forKey:@"activeFormat"];
  333.         [video_device setValue:min_frame_duration forKey:@"activeVideoMinFrameDuration"];
  334.         [video_device setValue:min_frame_duration forKey:@"activeVideoMaxFrameDuration"];
  335.     } else {
  336.         av_log(s, AV_LOG_ERROR, "Could not lock device for configuration");
  337.         return AVERROR(EINVAL);
  338.     }
  339.  
  340.     return 0;
  341.  
  342. unsupported_format:
  343.  
  344.     av_log(s, AV_LOG_ERROR, "Supported modes:\n");
  345.     for (format in [video_device valueForKey:@"formats"]) {
  346.         CMFormatDescriptionRef formatDescription;
  347.         CMVideoDimensions dimensions;
  348.  
  349.         formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
  350.         dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
  351.  
  352.         for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
  353.             double min_framerate;
  354.             double max_framerate;
  355.  
  356.             [[range valueForKey:@"minFrameRate"] getValue:&min_framerate];
  357.             [[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
  358.             av_log(s, AV_LOG_ERROR, "  %dx%d@[%f %f]fps\n",
  359.                 dimensions.width, dimensions.height,
  360.                 min_framerate, max_framerate);
  361.         }
  362.     }
  363.     return AVERROR(EINVAL);
  364. }
  365.  
  366. static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
  367. {
  368.     AVFContext *ctx = (AVFContext*)s->priv_data;
  369.     int ret;
  370.     NSError *error  = nil;
  371.     AVCaptureInput* capture_input = nil;
  372.     struct AVFPixelFormatSpec pxl_fmt_spec;
  373.     NSNumber *pixel_format;
  374.     NSDictionary *capture_dict;
  375.     dispatch_queue_t queue;
  376.  
  377.     if (ctx->video_device_index < ctx->num_video_devices) {
  378.         capture_input = (AVCaptureInput*) [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];
  379.     } else {
  380.         capture_input = (AVCaptureInput*) video_device;
  381.     }
  382.  
  383.     if (!capture_input) {
  384.         av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
  385.                [[error localizedDescription] UTF8String]);
  386.         return 1;
  387.     }
  388.  
  389.     if ([ctx->capture_session canAddInput:capture_input]) {
  390.         [ctx->capture_session addInput:capture_input];
  391.     } else {
  392.         av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
  393.         return 1;
  394.     }
  395.  
  396.     // Attaching output
  397.     ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];
  398.  
  399.     if (!ctx->video_output) {
  400.         av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
  401.         return 1;
  402.     }
  403.  
  404.     // Configure device framerate and video size
  405.     @try {
  406.         if ((ret = configure_video_device(s, video_device)) < 0) {
  407.             return ret;
  408.         }
  409.     } @catch (NSException *exception) {
  410.         if (![[exception name] isEqualToString:NSUndefinedKeyException]) {
  411.           av_log (s, AV_LOG_ERROR, "An error occurred: %s", [exception.reason UTF8String]);
  412.           return AVERROR_EXTERNAL;
  413.         }
  414.     }
  415.  
  416.     // select pixel format
  417.     pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
  418.  
  419.     for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
  420.         if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
  421.             pxl_fmt_spec = avf_pixel_formats[i];
  422.             break;
  423.         }
  424.     }
  425.  
  426.     // check if selected pixel format is supported by AVFoundation
  427.     if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
  428.         av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
  429.                av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
  430.         return 1;
  431.     }
  432.  
  433.     // check if the pixel format is available for this device
  434.     if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
  435.         av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
  436.                av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
  437.  
  438.         pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
  439.  
  440.         av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
  441.         for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
  442.             struct AVFPixelFormatSpec pxl_fmt_dummy;
  443.             pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
  444.             for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
  445.                 if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
  446.                     pxl_fmt_dummy = avf_pixel_formats[i];
  447.                     break;
  448.                 }
  449.             }
  450.  
  451.             if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
  452.                 av_log(s, AV_LOG_ERROR, "  %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));
  453.  
  454.                 // select first supported pixel format instead of user selected (or default) pixel format
  455.                 if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
  456.                     pxl_fmt_spec = pxl_fmt_dummy;
  457.                 }
  458.             }
  459.         }
  460.  
  461.         // fail if there is no appropriate pixel format or print a warning about overriding the pixel format
  462.         if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
  463.             return 1;
  464.         } else {
  465.             av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
  466.                    av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
  467.         }
  468.     }
  469.  
  470.     ctx->pixel_format          = pxl_fmt_spec.ff_id;
  471.     pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
  472.     capture_dict = [NSDictionary dictionaryWithObject:pixel_format
  473.                                                forKey:(id)kCVPixelBufferPixelFormatTypeKey];
  474.  
  475.     [ctx->video_output setVideoSettings:capture_dict];
  476.     [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
  477.  
  478.     ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
  479.  
  480.     queue = dispatch_queue_create("avf_queue", NULL);
  481.     [ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
  482.     dispatch_release(queue);
  483.  
  484.     if ([ctx->capture_session canAddOutput:ctx->video_output]) {
  485.         [ctx->capture_session addOutput:ctx->video_output];
  486.     } else {
  487.         av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
  488.         return 1;
  489.     }
  490.  
  491.     return 0;
  492. }
  493.  
  494. static int add_audio_device(AVFormatContext *s, AVCaptureDevice *audio_device)
  495. {
  496.     AVFContext *ctx = (AVFContext*)s->priv_data;
  497.     NSError *error  = nil;
  498.     AVCaptureDeviceInput* audio_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:audio_device error:&error] autorelease];
  499.     dispatch_queue_t queue;
  500.  
  501.     if (!audio_dev_input) {
  502.         av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
  503.                [[error localizedDescription] UTF8String]);
  504.         return 1;
  505.     }
  506.  
  507.     if ([ctx->capture_session canAddInput:audio_dev_input]) {
  508.         [ctx->capture_session addInput:audio_dev_input];
  509.     } else {
  510.         av_log(s, AV_LOG_ERROR, "can't add audio input to capture session\n");
  511.         return 1;
  512.     }
  513.  
  514.     // Attaching output
  515.     ctx->audio_output = [[AVCaptureAudioDataOutput alloc] init];
  516.  
  517.     if (!ctx->audio_output) {
  518.         av_log(s, AV_LOG_ERROR, "Failed to init AV audio output\n");
  519.         return 1;
  520.     }
  521.  
  522.     ctx->avf_audio_delegate = [[AVFAudioReceiver alloc] initWithContext:ctx];
  523.  
  524.     queue = dispatch_queue_create("avf_audio_queue", NULL);
  525.     [ctx->audio_output setSampleBufferDelegate:ctx->avf_audio_delegate queue:queue];
  526.     dispatch_release(queue);
  527.  
  528.     if ([ctx->capture_session canAddOutput:ctx->audio_output]) {
  529.         [ctx->capture_session addOutput:ctx->audio_output];
  530.     } else {
  531.         av_log(s, AV_LOG_ERROR, "adding audio output to capture session failed\n");
  532.         return 1;
  533.     }
  534.  
  535.     return 0;
  536. }
  537.  
  538. static int get_video_config(AVFormatContext *s)
  539. {
  540.     AVFContext *ctx = (AVFContext*)s->priv_data;
  541.     CVImageBufferRef image_buffer;
  542.     CGSize image_buffer_size;
  543.     AVStream* stream = avformat_new_stream(s, NULL);
  544.  
  545.     if (!stream) {
  546.         return 1;
  547.     }
  548.  
  549.     // Take stream info from the first frame.
  550.     while (ctx->frames_captured < 1) {
  551.         CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
  552.     }
  553.  
  554.     lock_frames(ctx);
  555.  
  556.     ctx->video_stream_index = stream->index;
  557.  
  558.     avpriv_set_pts_info(stream, 64, 1, avf_time_base);
  559.  
  560.     image_buffer      = CMSampleBufferGetImageBuffer(ctx->current_frame);
  561.     image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
  562.  
  563.     stream->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
  564.     stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  565.     stream->codec->width      = (int)image_buffer_size.width;
  566.     stream->codec->height     = (int)image_buffer_size.height;
  567.     stream->codec->pix_fmt    = ctx->pixel_format;
  568.  
  569.     CFRelease(ctx->current_frame);
  570.     ctx->current_frame = nil;
  571.  
  572.     unlock_frames(ctx);
  573.  
  574.     return 0;
  575. }
  576.  
  577. static int get_audio_config(AVFormatContext *s)
  578. {
  579.     AVFContext *ctx = (AVFContext*)s->priv_data;
  580.     CMFormatDescriptionRef format_desc;
  581.     AVStream* stream = avformat_new_stream(s, NULL);
  582.  
  583.     if (!stream) {
  584.         return 1;
  585.     }
  586.  
  587.     // Take stream info from the first frame.
  588.     while (ctx->audio_frames_captured < 1) {
  589.         CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
  590.     }
  591.  
  592.     lock_frames(ctx);
  593.  
  594.     ctx->audio_stream_index = stream->index;
  595.  
  596.     avpriv_set_pts_info(stream, 64, 1, avf_time_base);
  597.  
  598.     format_desc = CMSampleBufferGetFormatDescription(ctx->current_audio_frame);
  599.     const AudioStreamBasicDescription *basic_desc = CMAudioFormatDescriptionGetStreamBasicDescription(format_desc);
  600.  
  601.     if (!basic_desc) {
  602.         av_log(s, AV_LOG_ERROR, "audio format not available\n");
  603.         return 1;
  604.     }
  605.  
  606.     stream->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
  607.     stream->codec->sample_rate    = basic_desc->mSampleRate;
  608.     stream->codec->channels       = basic_desc->mChannelsPerFrame;
  609.     stream->codec->channel_layout = av_get_default_channel_layout(stream->codec->channels);
  610.  
  611.     ctx->audio_channels        = basic_desc->mChannelsPerFrame;
  612.     ctx->audio_bits_per_sample = basic_desc->mBitsPerChannel;
  613.     ctx->audio_float           = basic_desc->mFormatFlags & kAudioFormatFlagIsFloat;
  614.     ctx->audio_be              = basic_desc->mFormatFlags & kAudioFormatFlagIsBigEndian;
  615.     ctx->audio_signed_integer  = basic_desc->mFormatFlags & kAudioFormatFlagIsSignedInteger;
  616.     ctx->audio_packed          = basic_desc->mFormatFlags & kAudioFormatFlagIsPacked;
  617.     ctx->audio_non_interleaved = basic_desc->mFormatFlags & kAudioFormatFlagIsNonInterleaved;
  618.  
  619.     if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
  620.         ctx->audio_float &&
  621.         ctx->audio_bits_per_sample == 32 &&
  622.         ctx->audio_packed) {
  623.         stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
  624.     } else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
  625.         ctx->audio_signed_integer &&
  626.         ctx->audio_bits_per_sample == 16 &&
  627.         ctx->audio_packed) {
  628.         stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S16BE : AV_CODEC_ID_PCM_S16LE;
  629.     } else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
  630.         ctx->audio_signed_integer &&
  631.         ctx->audio_bits_per_sample == 24 &&
  632.         ctx->audio_packed) {
  633.         stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
  634.     } else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
  635.         ctx->audio_signed_integer &&
  636.         ctx->audio_bits_per_sample == 32 &&
  637.         ctx->audio_packed) {
  638.         stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
  639.     } else {
  640.         av_log(s, AV_LOG_ERROR, "audio format is not supported\n");
  641.         return 1;
  642.     }
  643.  
  644.     if (ctx->audio_non_interleaved) {
  645.         CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
  646.         ctx->audio_buffer_size        = CMBlockBufferGetDataLength(block_buffer);
  647.         ctx->audio_buffer             = av_malloc(ctx->audio_buffer_size);
  648.         if (!ctx->audio_buffer) {
  649.             av_log(s, AV_LOG_ERROR, "error allocating audio buffer\n");
  650.             return 1;
  651.         }
  652.     }
  653.  
  654.     CFRelease(ctx->current_audio_frame);
  655.     ctx->current_audio_frame = nil;
  656.  
  657.     unlock_frames(ctx);
  658.  
  659.     return 0;
  660. }
  661.  
  662. static int avf_read_header(AVFormatContext *s)
  663. {
  664.     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  665.     int capture_screen      = 0;
  666.     uint32_t num_screens    = 0;
  667.     AVFContext *ctx         = (AVFContext*)s->priv_data;
  668.     AVCaptureDevice *video_device = nil;
  669.     AVCaptureDevice *audio_device = nil;
  670.     // Find capture device
  671.     NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  672.     ctx->num_video_devices = [devices count];
  673.  
  674.     ctx->first_pts          = av_gettime();
  675.     ctx->first_audio_pts    = av_gettime();
  676.  
  677.     pthread_mutex_init(&ctx->frame_lock, NULL);
  678.     pthread_cond_init(&ctx->frame_wait_cond, NULL);
  679.  
  680. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
  681.     CGGetActiveDisplayList(0, NULL, &num_screens);
  682. #endif
  683.  
  684.     // List devices if requested
  685.     if (ctx->list_devices) {
  686.         int index = 0;
  687.         av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
  688.         for (AVCaptureDevice *device in devices) {
  689.             const char *name = [[device localizedName] UTF8String];
  690.             index            = [devices indexOfObject:device];
  691.             av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
  692.             index++;
  693.         }
  694. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
  695.         if (num_screens > 0) {
  696.             CGDirectDisplayID screens[num_screens];
  697.             CGGetActiveDisplayList(num_screens, screens, &num_screens);
  698.             for (int i = 0; i < num_screens; i++) {
  699.                 av_log(ctx, AV_LOG_INFO, "[%d] Capture screen %d\n", index + i, i);
  700.             }
  701.         }
  702. #endif
  703.  
  704.         av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n");
  705.         devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
  706.         for (AVCaptureDevice *device in devices) {
  707.             const char *name = [[device localizedName] UTF8String];
  708.             int index  = [devices indexOfObject:device];
  709.             av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
  710.         }
  711.          goto fail;
  712.     }
  713.  
  714.     // parse input filename for video and audio device
  715.     parse_device_name(s);
  716.  
  717.     // check for device index given in filename
  718.     if (ctx->video_device_index == -1 && ctx->video_filename) {
  719.         sscanf(ctx->video_filename, "%d", &ctx->video_device_index);
  720.     }
  721.     if (ctx->audio_device_index == -1 && ctx->audio_filename) {
  722.         sscanf(ctx->audio_filename, "%d", &ctx->audio_device_index);
  723.     }
  724.  
  725.     if (ctx->video_device_index >= 0) {
  726.         if (ctx->video_device_index < ctx->num_video_devices) {
  727.             video_device = [devices objectAtIndex:ctx->video_device_index];
  728.         } else if (ctx->video_device_index < ctx->num_video_devices + num_screens) {
  729. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
  730.             CGDirectDisplayID screens[num_screens];
  731.             CGGetActiveDisplayList(num_screens, screens, &num_screens);
  732.             AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[ctx->video_device_index - ctx->num_video_devices]] autorelease];
  733.  
  734.             if (ctx->framerate.num > 0) {
  735.                 capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
  736.             }
  737.  
  738. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
  739.             if (ctx->capture_cursor) {
  740.                 capture_screen_input.capturesCursor = YES;
  741.             } else {
  742.                 capture_screen_input.capturesCursor = NO;
  743.             }
  744. #endif
  745.  
  746.             if (ctx->capture_mouse_clicks) {
  747.                 capture_screen_input.capturesMouseClicks = YES;
  748.             } else {
  749.                 capture_screen_input.capturesMouseClicks = NO;
  750.             }
  751.  
  752.             video_device = (AVCaptureDevice*) capture_screen_input;
  753.             capture_screen = 1;
  754. #endif
  755.          } else {
  756.             av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
  757.             goto fail;
  758.         }
  759.     } else if (ctx->video_filename &&
  760.                strncmp(ctx->video_filename, "none", 4)) {
  761.         if (!strncmp(ctx->video_filename, "default", 7)) {
  762.             video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
  763.         } else {
  764.         // looking for video inputs
  765.         for (AVCaptureDevice *device in devices) {
  766.             if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
  767.                 video_device = device;
  768.                 break;
  769.             }
  770.         }
  771.  
  772. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
  773.         // looking for screen inputs
  774.         if (!video_device) {
  775.             int idx;
  776.             if(sscanf(ctx->video_filename, "Capture screen %d", &idx) && idx < num_screens) {
  777.                 CGDirectDisplayID screens[num_screens];
  778.                 CGGetActiveDisplayList(num_screens, screens, &num_screens);
  779.                 AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease];
  780.                 video_device = (AVCaptureDevice*) capture_screen_input;
  781.                 ctx->video_device_index = ctx->num_video_devices + idx;
  782.                 capture_screen = 1;
  783.  
  784.                 if (ctx->framerate.num > 0) {
  785.                     capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
  786.                 }
  787.  
  788. #if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
  789.                 if (ctx->capture_cursor) {
  790.                     capture_screen_input.capturesCursor = YES;
  791.                 } else {
  792.                     capture_screen_input.capturesCursor = NO;
  793.                 }
  794. #endif
  795.  
  796.                 if (ctx->capture_mouse_clicks) {
  797.                     capture_screen_input.capturesMouseClicks = YES;
  798.                 } else {
  799.                     capture_screen_input.capturesMouseClicks = NO;
  800.                 }
  801.             }
  802.         }
  803. #endif
  804.         }
  805.  
  806.         if (!video_device) {
  807.             av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
  808.             goto fail;
  809.         }
  810.     }
  811.  
  812.     // get audio device
  813.     if (ctx->audio_device_index >= 0) {
  814.         NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
  815.  
  816.         if (ctx->audio_device_index >= [devices count]) {
  817.             av_log(ctx, AV_LOG_ERROR, "Invalid audio device index\n");
  818.             goto fail;
  819.         }
  820.  
  821.         audio_device = [devices objectAtIndex:ctx->audio_device_index];
  822.     } else if (ctx->audio_filename &&
  823.                strncmp(ctx->audio_filename, "none", 4)) {
  824.         if (!strncmp(ctx->audio_filename, "default", 7)) {
  825.             audio_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
  826.         } else {
  827.         NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
  828.  
  829.         for (AVCaptureDevice *device in devices) {
  830.             if (!strncmp(ctx->audio_filename, [[device localizedName] UTF8String], strlen(ctx->audio_filename))) {
  831.                 audio_device = device;
  832.                 break;
  833.             }
  834.         }
  835.         }
  836.  
  837.         if (!audio_device) {
  838.             av_log(ctx, AV_LOG_ERROR, "Audio device not found\n");
  839.              goto fail;
  840.         }
  841.     }
  842.  
  843.     // Video nor Audio capture device not found, looking for AVMediaTypeVideo/Audio
  844.     if (!video_device && !audio_device) {
  845.         av_log(s, AV_LOG_ERROR, "No AV capture device found\n");
  846.         goto fail;
  847.     }
  848.  
  849.     if (video_device) {
  850.         if (ctx->video_device_index < ctx->num_video_devices) {
  851.             av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device localizedName] UTF8String]);
  852.         } else {
  853.             av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device description] UTF8String]);
  854.         }
  855.     }
  856.     if (audio_device) {
  857.         av_log(s, AV_LOG_DEBUG, "audio device '%s' opened\n", [[audio_device localizedName] UTF8String]);
  858.     }
  859.  
  860.     // Initialize capture session
  861.     ctx->capture_session = [[AVCaptureSession alloc] init];
  862.  
  863.     if (video_device && add_video_device(s, video_device)) {
  864.         goto fail;
  865.     }
  866.     if (audio_device && add_audio_device(s, audio_device)) {
  867.     }
  868.  
  869.     [ctx->capture_session startRunning];
  870.  
  871.     /* Unlock device configuration only after the session is started so it
  872.      * does not reset the capture formats */
  873.     if (!capture_screen) {
  874.         [video_device unlockForConfiguration];
  875.     }
  876.  
  877.     if (video_device && get_video_config(s)) {
  878.         goto fail;
  879.     }
  880.  
  881.     // set audio stream
  882.     if (audio_device && get_audio_config(s)) {
  883.         goto fail;
  884.     }
  885.  
  886.     [pool release];
  887.     return 0;
  888.  
  889. fail:
  890.     [pool release];
  891.     destroy_context(ctx);
  892.     return AVERROR(EIO);
  893. }
  894.  
  895. static int avf_read_packet(AVFormatContext *s, AVPacket *pkt)
  896. {
  897.     AVFContext* ctx = (AVFContext*)s->priv_data;
  898.  
  899.     do {
  900.         CVImageBufferRef image_buffer;
  901.         lock_frames(ctx);
  902.  
  903.         image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
  904.  
  905.         if (ctx->current_frame != nil) {
  906.             void *data;
  907.             if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) {
  908.                 return AVERROR(EIO);
  909.             }
  910.  
  911.             CMItemCount count;
  912.             CMSampleTimingInfo timing_info;
  913.  
  914.             if (CMSampleBufferGetOutputSampleTimingInfoArray(ctx->current_frame, 1, &timing_info, &count) == noErr) {
  915.                 AVRational timebase_q = av_make_q(1, timing_info.presentationTimeStamp.timescale);
  916.                 pkt->pts = pkt->dts = av_rescale_q(timing_info.presentationTimeStamp.value, timebase_q, avf_time_base_q);
  917.             }
  918.  
  919.             pkt->stream_index  = ctx->video_stream_index;
  920.             pkt->flags        |= AV_PKT_FLAG_KEY;
  921.  
  922.             CVPixelBufferLockBaseAddress(image_buffer, 0);
  923.  
  924.             data = CVPixelBufferGetBaseAddress(image_buffer);
  925.             memcpy(pkt->data, data, pkt->size);
  926.  
  927.             CVPixelBufferUnlockBaseAddress(image_buffer, 0);
  928.             CFRelease(ctx->current_frame);
  929.             ctx->current_frame = nil;
  930.         } else if (ctx->current_audio_frame != nil) {
  931.             CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
  932.             int block_buffer_size         = CMBlockBufferGetDataLength(block_buffer);
  933.  
  934.             if (!block_buffer || !block_buffer_size) {
  935.                 return AVERROR(EIO);
  936.             }
  937.  
  938.             if (ctx->audio_non_interleaved && block_buffer_size > ctx->audio_buffer_size) {
  939.                 return AVERROR_BUFFER_TOO_SMALL;
  940.             }
  941.  
  942.             if (av_new_packet(pkt, block_buffer_size) < 0) {
  943.                 return AVERROR(EIO);
  944.             }
  945.  
  946.             CMItemCount count;
  947.             CMSampleTimingInfo timing_info;
  948.  
  949.             if (CMSampleBufferGetOutputSampleTimingInfoArray(ctx->current_audio_frame, 1, &timing_info, &count) == noErr) {
  950.                 AVRational timebase_q = av_make_q(1, timing_info.presentationTimeStamp.timescale);
  951.                 pkt->pts = pkt->dts = av_rescale_q(timing_info.presentationTimeStamp.value, timebase_q, avf_time_base_q);
  952.             }
  953.  
  954.             pkt->stream_index  = ctx->audio_stream_index;
  955.             pkt->flags        |= AV_PKT_FLAG_KEY;
  956.  
  957.             if (ctx->audio_non_interleaved) {
  958.                 int sample, c, shift, num_samples;
  959.  
  960.                 OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, ctx->audio_buffer);
  961.                 if (ret != kCMBlockBufferNoErr) {
  962.                     return AVERROR(EIO);
  963.                 }
  964.  
  965.                 num_samples = pkt->size / (ctx->audio_channels * (ctx->audio_bits_per_sample >> 3));
  966.  
  967.                 // transform decoded frame into output format
  968.                 #define INTERLEAVE_OUTPUT(bps)                                         \
  969.                 {                                                                      \
  970.                     int##bps##_t **src;                                                \
  971.                     int##bps##_t *dest;                                                \
  972.                     src = av_malloc(ctx->audio_channels * sizeof(int##bps##_t*));      \
  973.                     if (!src) return AVERROR(EIO);                                     \
  974.                     for (c = 0; c < ctx->audio_channels; c++) {                        \
  975.                         src[c] = ((int##bps##_t*)ctx->audio_buffer) + c * num_samples; \
  976.                     }                                                                  \
  977.                     dest  = (int##bps##_t*)pkt->data;                                  \
  978.                     shift = bps - ctx->audio_bits_per_sample;                          \
  979.                     for (sample = 0; sample < num_samples; sample++)                   \
  980.                         for (c = 0; c < ctx->audio_channels; c++)                      \
  981.                             *dest++ = src[c][sample] << shift;                         \
  982.                     av_freep(&src);                                                    \
  983.                 }
  984.  
  985.                 if (ctx->audio_bits_per_sample <= 16) {
  986.                     INTERLEAVE_OUTPUT(16)
  987.                 } else {
  988.                     INTERLEAVE_OUTPUT(32)
  989.                 }
  990.             } else {
  991.                 OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, pkt->data);
  992.                 if (ret != kCMBlockBufferNoErr) {
  993.                     return AVERROR(EIO);
  994.                 }
  995.             }
  996.  
  997.             CFRelease(ctx->current_audio_frame);
  998.             ctx->current_audio_frame = nil;
  999.         } else {
  1000.             pkt->data = NULL;
  1001.             pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
  1002.         }
  1003.  
  1004.         unlock_frames(ctx);
  1005.     } while (!pkt->data);
  1006.  
  1007.     return 0;
  1008. }
  1009.  
  1010. static int avf_close(AVFormatContext *s)
  1011. {
  1012.     AVFContext* ctx = (AVFContext*)s->priv_data;
  1013.     destroy_context(ctx);
  1014.     return 0;
  1015. }
  1016.  
  1017. static const AVOption options[] = {
  1018.     { "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
  1019.     { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
  1020.     { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
  1021.     { "video_device_index", "select video device by index for devices with same name (starts at 0)", offsetof(AVFContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  1022.     { "audio_device_index", "select audio device by index for devices with same name (starts at 0)", offsetof(AVFContext, audio_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
  1023.     { "pixel_format", "set pixel format", offsetof(AVFContext, pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_YUV420P}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
  1024.     { "framerate", "set frame rate", offsetof(AVFContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
  1025.     { "video_size", "set video size", offsetof(AVFContext, width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
  1026.     { "capture_cursor", "capture the screen cursor", offsetof(AVFContext, capture_cursor), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
  1027.     { "capture_mouse_clicks", "capture the screen mouse clicks", offsetof(AVFContext, capture_mouse_clicks), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
  1028.  
  1029.     { NULL },
  1030. };
  1031.  
  1032. static const AVClass avf_class = {
  1033.     .class_name = "AVFoundation input device",
  1034.     .item_name  = av_default_item_name,
  1035.     .option     = options,
  1036.     .version    = LIBAVUTIL_VERSION_INT,
  1037.     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
  1038. };
  1039.  
  1040. AVInputFormat ff_avfoundation_demuxer = {
  1041.     .name           = "avfoundation",
  1042.     .long_name      = NULL_IF_CONFIG_SMALL("AVFoundation input device"),
  1043.     .priv_data_size = sizeof(AVFContext),
  1044.     .read_header    = avf_read_header,
  1045.     .read_packet    = avf_read_packet,
  1046.     .read_close     = avf_close,
  1047.     .flags          = AVFMT_NOFILE,
  1048.     .priv_class     = &avf_class,
  1049. };
  1050.