FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
avfoundation.m
Go to the documentation of this file.
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/time.h"
37 #include "avdevice.h"
38 
39 static const int avf_time_base = 1000000;
40 
41 static const AVRational avf_time_base_q = {
42  .num = 1,
43  .den = avf_time_base
44 };
45 
48  OSType avf_id;
49 };
50 
51 static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
52  { AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome },
53  { AV_PIX_FMT_RGB555BE, kCVPixelFormatType_16BE555 },
54  { AV_PIX_FMT_RGB555LE, kCVPixelFormatType_16LE555 },
55  { AV_PIX_FMT_RGB565BE, kCVPixelFormatType_16BE565 },
56  { AV_PIX_FMT_RGB565LE, kCVPixelFormatType_16LE565 },
57  { AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB },
58  { AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR },
59  { AV_PIX_FMT_0RGB, kCVPixelFormatType_32ARGB },
60  { AV_PIX_FMT_BGR0, kCVPixelFormatType_32BGRA },
61  { AV_PIX_FMT_0BGR, kCVPixelFormatType_32ABGR },
62  { AV_PIX_FMT_RGB0, kCVPixelFormatType_32RGBA },
63  { AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB },
64  { AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 },
65  { AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R },
66  { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
67  { AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 },
68  { AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 },
69  { AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 },
70  { AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 },
71  { AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar },
72  { AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
73  { AV_PIX_FMT_YUYV422, kCVPixelFormatType_422YpCbCr8_yuvs },
74 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
75  { AV_PIX_FMT_GRAY8, kCVPixelFormatType_OneComponent8 },
76 #endif
77  { AV_PIX_FMT_NONE, 0 }
78 };
79 
80 typedef struct
81 {
82  AVClass* class;
83 
86  int64_t first_pts;
87  int64_t first_audio_pts;
92 
98 
101 
103 
107  int audio_be;
111 
114 
116 
117  AVCaptureSession *capture_session;
118  AVCaptureVideoDataOutput *video_output;
119  AVCaptureAudioDataOutput *audio_output;
120  CMSampleBufferRef current_frame;
121  CMSampleBufferRef current_audio_frame;
122 } AVFContext;
123 
124 static void lock_frames(AVFContext* ctx)
125 {
127 }
128 
129 static void unlock_frames(AVFContext* ctx)
130 {
132 }
133 
134 /** FrameReciever class - delegate for AVCaptureSession
135  */
136 @interface AVFFrameReceiver : NSObject
137 {
139 }
140 
141 - (id)initWithContext:(AVFContext*)context;
142 
143 - (void) captureOutput:(AVCaptureOutput *)captureOutput
144  didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
145  fromConnection:(AVCaptureConnection *)connection;
146 
147 @end
148 
149 @implementation AVFFrameReceiver
150 
151 - (id)initWithContext:(AVFContext*)context
152 {
153  if (self = [super init]) {
154  _context = context;
155  }
156  return self;
157 }
158 
159 - (void) captureOutput:(AVCaptureOutput *)captureOutput
160  didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
161  fromConnection:(AVCaptureConnection *)connection
162 {
164 
165  if (_context->current_frame != nil) {
166  CFRelease(_context->current_frame);
167  }
168 
169  _context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);
170 
172 
174 
176 }
177 
178 @end
179 
180 /** AudioReciever class - delegate for AVCaptureSession
181  */
182 @interface AVFAudioReceiver : NSObject
183 {
185 }
186 
187 - (id)initWithContext:(AVFContext*)context;
188 
189 - (void) captureOutput:(AVCaptureOutput *)captureOutput
190  didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
191  fromConnection:(AVCaptureConnection *)connection;
192 
193 @end
194 
195 @implementation AVFAudioReceiver
196 
197 - (id)initWithContext:(AVFContext*)context
198 {
199  if (self = [super init]) {
200  _context = context;
201  }
202  return self;
203 }
204 
205 - (void) captureOutput:(AVCaptureOutput *)captureOutput
206  didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
207  fromConnection:(AVCaptureConnection *)connection
208 {
210 
211  if (_context->current_audio_frame != nil) {
212  CFRelease(_context->current_audio_frame);
213  }
214 
215  _context->current_audio_frame = (CMSampleBufferRef)CFRetain(audioFrame);
216 
218 
220 
222 }
223 
224 @end
225 
226 static void destroy_context(AVFContext* ctx)
227 {
228  [ctx->capture_session stopRunning];
229 
230  [ctx->capture_session release];
231  [ctx->video_output release];
232  [ctx->audio_output release];
233  [ctx->avf_delegate release];
234  [ctx->avf_audio_delegate release];
235 
236  ctx->capture_session = NULL;
237  ctx->video_output = NULL;
238  ctx->audio_output = NULL;
239  ctx->avf_delegate = NULL;
240  ctx->avf_audio_delegate = NULL;
241 
242  av_freep(&ctx->audio_buffer);
243 
246 
247  if (ctx->current_frame) {
248  CFRelease(ctx->current_frame);
249  }
250 }
251 
253 {
254  AVFContext *ctx = (AVFContext*)s->priv_data;
255  char *tmp = av_strdup(s->filename);
256  char *save;
257 
258  if (tmp[0] != ':') {
259  ctx->video_filename = av_strtok(tmp, ":", &save);
260  ctx->audio_filename = av_strtok(NULL, ":", &save);
261  } else {
262  ctx->audio_filename = av_strtok(tmp, ":", &save);
263  }
264 }
265 
266 static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
267 {
268  AVFContext *ctx = (AVFContext*)s->priv_data;
269  NSError *error = nil;
270  AVCaptureInput* capture_input = nil;
271 
272  if (ctx->video_device_index < ctx->num_video_devices) {
273  capture_input = (AVCaptureInput*) [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];
274  } else {
275  capture_input = (AVCaptureInput*) video_device;
276  }
277 
278  if (!capture_input) {
279  av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
280  [[error localizedDescription] UTF8String]);
281  return 1;
282  }
283 
284  if ([ctx->capture_session canAddInput:capture_input]) {
285  [ctx->capture_session addInput:capture_input];
286  } else {
287  av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
288  return 1;
289  }
290 
291  // Attaching output
292  ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];
293 
294  if (!ctx->video_output) {
295  av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
296  return 1;
297  }
298 
299  // select pixel format
300  struct AVFPixelFormatSpec pxl_fmt_spec;
301  pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
302 
303  for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
304  if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
305  pxl_fmt_spec = avf_pixel_formats[i];
306  break;
307  }
308  }
309 
310  // check if selected pixel format is supported by AVFoundation
311  if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
312  av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
313  av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
314  return 1;
315  }
316 
317  // check if the pixel format is available for this device
318  if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
319  av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
320  av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
321 
322  pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
323 
324  av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
325  for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
326  struct AVFPixelFormatSpec pxl_fmt_dummy;
327  pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
328  for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
329  if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
330  pxl_fmt_dummy = avf_pixel_formats[i];
331  break;
332  }
333  }
334 
335  if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
336  av_log(s, AV_LOG_ERROR, " %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));
337 
338  // select first supported pixel format instead of user selected (or default) pixel format
339  if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
340  pxl_fmt_spec = pxl_fmt_dummy;
341  }
342  }
343  }
344 
345  // fail if there is no appropriate pixel format or print a warning about overriding the pixel format
346  if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
347  return 1;
348  } else {
349  av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
350  av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
351  }
352  }
353 
354  ctx->pixel_format = pxl_fmt_spec.ff_id;
355  NSNumber *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
356  NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format
357  forKey:(id)kCVPixelBufferPixelFormatTypeKey];
358 
359  [ctx->video_output setVideoSettings:capture_dict];
360  [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
361 
362  ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
363 
364  dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
365  [ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
366  dispatch_release(queue);
367 
368  if ([ctx->capture_session canAddOutput:ctx->video_output]) {
369  [ctx->capture_session addOutput:ctx->video_output];
370  } else {
371  av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
372  return 1;
373  }
374 
375  return 0;
376 }
377 
378 static int add_audio_device(AVFormatContext *s, AVCaptureDevice *audio_device)
379 {
380  AVFContext *ctx = (AVFContext*)s->priv_data;
381  NSError *error = nil;
382  AVCaptureDeviceInput* audio_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:audio_device error:&error] autorelease];
383 
384  if (!audio_dev_input) {
385  av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
386  [[error localizedDescription] UTF8String]);
387  return 1;
388  }
389 
390  if ([ctx->capture_session canAddInput:audio_dev_input]) {
391  [ctx->capture_session addInput:audio_dev_input];
392  } else {
393  av_log(s, AV_LOG_ERROR, "can't add audio input to capture session\n");
394  return 1;
395  }
396 
397  // Attaching output
398  ctx->audio_output = [[AVCaptureAudioDataOutput alloc] init];
399 
400  if (!ctx->audio_output) {
401  av_log(s, AV_LOG_ERROR, "Failed to init AV audio output\n");
402  return 1;
403  }
404 
405  ctx->avf_audio_delegate = [[AVFAudioReceiver alloc] initWithContext:ctx];
406 
407  dispatch_queue_t queue = dispatch_queue_create("avf_audio_queue", NULL);
408  [ctx->audio_output setSampleBufferDelegate:ctx->avf_audio_delegate queue:queue];
409  dispatch_release(queue);
410 
411  if ([ctx->capture_session canAddOutput:ctx->audio_output]) {
412  [ctx->capture_session addOutput:ctx->audio_output];
413  } else {
414  av_log(s, AV_LOG_ERROR, "adding audio output to capture session failed\n");
415  return 1;
416  }
417 
418  return 0;
419 }
420 
422 {
423  AVFContext *ctx = (AVFContext*)s->priv_data;
424 
425  // Take stream info from the first frame.
426  while (ctx->frames_captured < 1) {
427  CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
428  }
429 
430  lock_frames(ctx);
431 
432  AVStream* stream = avformat_new_stream(s, NULL);
433 
434  if (!stream) {
435  return 1;
436  }
437 
438  ctx->video_stream_index = stream->index;
439 
440  avpriv_set_pts_info(stream, 64, 1, avf_time_base);
441 
442  CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
443  CGSize image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
444 
447  stream->codec->width = (int)image_buffer_size.width;
448  stream->codec->height = (int)image_buffer_size.height;
449  stream->codec->pix_fmt = ctx->pixel_format;
450 
451  CFRelease(ctx->current_frame);
452  ctx->current_frame = nil;
453 
454  unlock_frames(ctx);
455 
456  return 0;
457 }
458 
460 {
461  AVFContext *ctx = (AVFContext*)s->priv_data;
462 
463  // Take stream info from the first frame.
464  while (ctx->audio_frames_captured < 1) {
465  CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
466  }
467 
468  lock_frames(ctx);
469 
470  AVStream* stream = avformat_new_stream(s, NULL);
471 
472  if (!stream) {
473  return 1;
474  }
475 
476  ctx->audio_stream_index = stream->index;
477 
478  avpriv_set_pts_info(stream, 64, 1, avf_time_base);
479 
480  CMFormatDescriptionRef format_desc = CMSampleBufferGetFormatDescription(ctx->current_audio_frame);
481  const AudioStreamBasicDescription *basic_desc = CMAudioFormatDescriptionGetStreamBasicDescription(format_desc);
482 
483  if (!basic_desc) {
484  av_log(s, AV_LOG_ERROR, "audio format not available\n");
485  return 1;
486  }
487 
489  stream->codec->sample_rate = basic_desc->mSampleRate;
490  stream->codec->channels = basic_desc->mChannelsPerFrame;
492 
493  ctx->audio_channels = basic_desc->mChannelsPerFrame;
494  ctx->audio_bits_per_sample = basic_desc->mBitsPerChannel;
495  ctx->audio_float = basic_desc->mFormatFlags & kAudioFormatFlagIsFloat;
496  ctx->audio_be = basic_desc->mFormatFlags & kAudioFormatFlagIsBigEndian;
497  ctx->audio_signed_integer = basic_desc->mFormatFlags & kAudioFormatFlagIsSignedInteger;
498  ctx->audio_packed = basic_desc->mFormatFlags & kAudioFormatFlagIsPacked;
499  ctx->audio_non_interleaved = basic_desc->mFormatFlags & kAudioFormatFlagIsNonInterleaved;
500 
501  if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
502  ctx->audio_float &&
503  ctx->audio_packed) {
505  } else {
506  av_log(s, AV_LOG_ERROR, "audio format is not supported\n");
507  return 1;
508  }
509 
510  if (ctx->audio_non_interleaved) {
511  CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
512  ctx->audio_buffer_size = CMBlockBufferGetDataLength(block_buffer);
514  if (!ctx->audio_buffer) {
515  av_log(s, AV_LOG_ERROR, "error allocating audio buffer\n");
516  return 1;
517  }
518  }
519 
520  CFRelease(ctx->current_audio_frame);
521  ctx->current_audio_frame = nil;
522 
523  unlock_frames(ctx);
524 
525  return 0;
526 }
527 
529 {
530  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
531  AVFContext *ctx = (AVFContext*)s->priv_data;
532  ctx->first_pts = av_gettime();
533  ctx->first_audio_pts = av_gettime();
534  uint32_t num_screens = 0;
535 
536  pthread_mutex_init(&ctx->frame_lock, NULL);
537  pthread_cond_init(&ctx->frame_wait_cond, NULL);
538 
539 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
540  CGGetActiveDisplayList(0, NULL, &num_screens);
541 #endif
542 
543  // List devices if requested
544  if (ctx->list_devices) {
545  av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
546  NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
547  int index = 0;
548  for (AVCaptureDevice *device in devices) {
549  const char *name = [[device localizedName] UTF8String];
550  index = [devices indexOfObject:device];
551  av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
552  index++;
553  }
554 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
555  if (num_screens > 0) {
556  CGDirectDisplayID screens[num_screens];
557  CGGetActiveDisplayList(num_screens, screens, &num_screens);
558  for (int i = 0; i < num_screens; i++) {
559  av_log(ctx, AV_LOG_INFO, "[%d] Capture screen %d\n", index + i, i);
560  }
561  }
562 #endif
563 
564  av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n");
565  devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
566  for (AVCaptureDevice *device in devices) {
567  const char *name = [[device localizedName] UTF8String];
568  int index = [devices indexOfObject:device];
569  av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
570  }
571  goto fail;
572  }
573 
574  // Find capture device
575  AVCaptureDevice *video_device = nil;
576  AVCaptureDevice *audio_device = nil;
577 
578  NSArray *video_devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
579  ctx->num_video_devices = [video_devices count];
580 
581  // parse input filename for video and audio device
583 
584  // check for device index given in filename
585  if (ctx->video_device_index == -1 && ctx->video_filename) {
586  sscanf(ctx->video_filename, "%d", &ctx->video_device_index);
587  }
588  if (ctx->audio_device_index == -1 && ctx->audio_filename) {
589  sscanf(ctx->audio_filename, "%d", &ctx->audio_device_index);
590  }
591 
592  if (ctx->video_device_index >= 0) {
593  if (ctx->video_device_index < ctx->num_video_devices) {
594  video_device = [video_devices objectAtIndex:ctx->video_device_index];
595  } else if (ctx->video_device_index < ctx->num_video_devices + num_screens) {
596 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
597  CGDirectDisplayID screens[num_screens];
598  CGGetActiveDisplayList(num_screens, screens, &num_screens);
599  AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[ctx->video_device_index - ctx->num_video_devices]] autorelease];
600  video_device = (AVCaptureDevice*) capture_screen_input;
601 #endif
602  } else {
603  av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
604  goto fail;
605  }
606  } else if (ctx->video_filename &&
607  strncmp(ctx->video_filename, "none", 4)) {
608  if (!strncmp(ctx->video_filename, "default", 7)) {
609  video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
610  } else {
611  // looking for video inputs
612  for (AVCaptureDevice *device in video_devices) {
613  if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
614  video_device = device;
615  break;
616  }
617  }
618 
619 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
620  // looking for screen inputs
621  if (!video_device) {
622  int idx;
623  if(sscanf(ctx->video_filename, "Capture screen %d", &idx) && idx < num_screens) {
624  CGDirectDisplayID screens[num_screens];
625  CGGetActiveDisplayList(num_screens, screens, &num_screens);
626  AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease];
627  video_device = (AVCaptureDevice*) capture_screen_input;
628  ctx->video_device_index = ctx->num_video_devices + idx;
629  }
630  }
631 #endif
632  }
633 
634  if (!video_device) {
635  av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
636  goto fail;
637  }
638  }
639 
640  // get audio device
641  if (ctx->audio_device_index >= 0) {
642  NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
643 
644  if (ctx->audio_device_index >= [devices count]) {
645  av_log(ctx, AV_LOG_ERROR, "Invalid audio device index\n");
646  goto fail;
647  }
648 
649  audio_device = [devices objectAtIndex:ctx->audio_device_index];
650  } else if (ctx->audio_filename &&
651  strncmp(ctx->audio_filename, "none", 4)) {
652  if (!strncmp(ctx->audio_filename, "default", 7)) {
653  audio_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
654  } else {
655  NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
656 
657  for (AVCaptureDevice *device in devices) {
658  if (!strncmp(ctx->audio_filename, [[device localizedName] UTF8String], strlen(ctx->audio_filename))) {
659  audio_device = device;
660  break;
661  }
662  }
663  }
664 
665  if (!audio_device) {
666  av_log(ctx, AV_LOG_ERROR, "Audio device not found\n");
667  goto fail;
668  }
669  }
670 
671  // Video nor Audio capture device not found, looking for AVMediaTypeVideo/Audio
672  if (!video_device && !audio_device) {
673  av_log(s, AV_LOG_ERROR, "No AV capture device found\n");
674  goto fail;
675  }
676 
677  if (video_device) {
678  if (ctx->video_device_index < ctx->num_video_devices) {
679  av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device localizedName] UTF8String]);
680  } else {
681  av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device description] UTF8String]);
682  }
683  }
684  if (audio_device) {
685  av_log(s, AV_LOG_DEBUG, "audio device '%s' opened\n", [[audio_device localizedName] UTF8String]);
686  }
687 
688  // Initialize capture session
689  ctx->capture_session = [[AVCaptureSession alloc] init];
690 
691  if (video_device && add_video_device(s, video_device)) {
692  goto fail;
693  }
694  if (audio_device && add_audio_device(s, audio_device)) {
695  }
696 
697  [ctx->capture_session startRunning];
698 
699  if (video_device && get_video_config(s)) {
700  goto fail;
701  }
702 
703  // set audio stream
704  if (audio_device && get_audio_config(s)) {
705  goto fail;
706  }
707 
708  [pool release];
709  return 0;
710 
711 fail:
712  [pool release];
713  destroy_context(ctx);
714  return AVERROR(EIO);
715 }
716 
718 {
719  AVFContext* ctx = (AVFContext*)s->priv_data;
720 
721  do {
722  lock_frames(ctx);
723 
724  CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
725 
726  if (ctx->current_frame != nil) {
727  if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) {
728  return AVERROR(EIO);
729  }
730 
731  pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts,
733  avf_time_base_q);
734  pkt->stream_index = ctx->video_stream_index;
735  pkt->flags |= AV_PKT_FLAG_KEY;
736 
737  CVPixelBufferLockBaseAddress(image_buffer, 0);
738 
739  void* data = CVPixelBufferGetBaseAddress(image_buffer);
740  memcpy(pkt->data, data, pkt->size);
741 
742  CVPixelBufferUnlockBaseAddress(image_buffer, 0);
743  CFRelease(ctx->current_frame);
744  ctx->current_frame = nil;
745  } else if (ctx->current_audio_frame != nil) {
746  CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
747  int block_buffer_size = CMBlockBufferGetDataLength(block_buffer);
748 
749  if (!block_buffer || !block_buffer_size) {
750  return AVERROR(EIO);
751  }
752 
753  if (ctx->audio_non_interleaved && block_buffer_size > ctx->audio_buffer_size) {
755  }
756 
757  if (av_new_packet(pkt, block_buffer_size) < 0) {
758  return AVERROR(EIO);
759  }
760 
761  pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_audio_pts,
763  avf_time_base_q);
764 
765  pkt->stream_index = ctx->audio_stream_index;
766  pkt->flags |= AV_PKT_FLAG_KEY;
767 
768  if (ctx->audio_non_interleaved) {
769  int sample, c, shift;
770 
771  OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, ctx->audio_buffer);
772  if (ret != kCMBlockBufferNoErr) {
773  return AVERROR(EIO);
774  }
775 
776  int num_samples = pkt->size / (ctx->audio_channels * (ctx->audio_bits_per_sample >> 3));
777 
778  // transform decoded frame into output format
779  #define INTERLEAVE_OUTPUT(bps) \
780  { \
781  int##bps##_t **src; \
782  int##bps##_t *dest; \
783  src = av_malloc(ctx->audio_channels * sizeof(int##bps##_t*)); \
784  if (!src) return AVERROR(EIO); \
785  for (c = 0; c < ctx->audio_channels; c++) { \
786  src[c] = ((int##bps##_t*)ctx->audio_buffer) + c * num_samples; \
787  } \
788  dest = (int##bps##_t*)pkt->data; \
789  shift = bps - ctx->audio_bits_per_sample; \
790  for (sample = 0; sample < num_samples; sample++) \
791  for (c = 0; c < ctx->audio_channels; c++) \
792  *dest++ = src[c][sample] << shift; \
793  av_freep(&src); \
794  }
795 
796  if (ctx->audio_bits_per_sample <= 16) {
798  } else {
800  }
801  } else {
802  OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, pkt->data);
803  if (ret != kCMBlockBufferNoErr) {
804  return AVERROR(EIO);
805  }
806  }
807 
808  CFRelease(ctx->current_audio_frame);
809  ctx->current_audio_frame = nil;
810  } else {
811  pkt->data = NULL;
813  }
814 
815  unlock_frames(ctx);
816  } while (!pkt->data);
817 
818  return 0;
819 }
820 
822 {
823  AVFContext* ctx = (AVFContext*)s->priv_data;
824  destroy_context(ctx);
825  return 0;
826 }
827 
828 static const AVOption options[] = {
829  { "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
830  { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
831  { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
832  { "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 },
833  { "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 },
834  { "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},
835  { NULL },
836 };
837 
838 static const AVClass avf_class = {
839  .class_name = "AVFoundation input device",
840  .item_name = av_default_item_name,
841  .option = options,
842  .version = LIBAVUTIL_VERSION_INT,
844 };
845 
847  .name = "avfoundation",
848  .long_name = NULL_IF_CONFIG_SMALL("AVFoundation input device"),
849  .priv_data_size = sizeof(AVFContext),
853  .flags = AVFMT_NOFILE,
854  .priv_class = &avf_class,
855 };