2 * AVFoundation input device
3 * Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
5 * This file is part of FFmpeg.
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.
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.
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
24 * AVFoundation input device
25 * @author Thilo Borgmann <thilo.borgmann@mail.de>
28 #import <AVFoundation/AVFoundation.h>
31 #include "libavutil/pixdesc.h"
32 #include "libavutil/opt.h"
33 #include "libavformat/internal.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/time.h"
38 static const int avf_time_base = 1000000;
40 static const AVRational avf_time_base_q = {
45 struct AVFPixelFormatSpec {
46 enum AVPixelFormat ff_id;
50 static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
51 { AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome },
52 { AV_PIX_FMT_RGB555BE, kCVPixelFormatType_16BE555 },
53 { AV_PIX_FMT_RGB555LE, kCVPixelFormatType_16LE555 },
54 { AV_PIX_FMT_RGB565BE, kCVPixelFormatType_16BE565 },
55 { AV_PIX_FMT_RGB565LE, kCVPixelFormatType_16LE565 },
56 { AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB },
57 { AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR },
58 { AV_PIX_FMT_0RGB, kCVPixelFormatType_32ARGB },
59 { AV_PIX_FMT_BGR0, kCVPixelFormatType_32BGRA },
60 { AV_PIX_FMT_0BGR, kCVPixelFormatType_32ABGR },
61 { AV_PIX_FMT_RGB0, kCVPixelFormatType_32RGBA },
62 { AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB },
63 { AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 },
64 { AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R },
65 { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
66 { AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 },
67 { AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 },
68 { AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 },
69 { AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 },
70 { AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar },
71 { AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
72 { AV_PIX_FMT_YUYV422, kCVPixelFormatType_422YpCbCr8_yuvs },
73 #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
74 { AV_PIX_FMT_GRAY8, kCVPixelFormatType_OneComponent8 },
76 { AV_PIX_FMT_NONE, 0 }
85 int audio_frames_captured;
87 int64_t first_audio_pts;
88 pthread_mutex_t frame_lock;
89 pthread_cond_t frame_wait_cond;
91 id avf_audio_delegate;
94 int video_device_index;
95 int video_stream_index;
96 int audio_device_index;
97 int audio_stream_index;
100 char *audio_filename;
103 int audio_bits_per_sample;
106 int audio_signed_integer;
108 int audio_non_interleaved;
110 int32_t *audio_buffer;
111 int audio_buffer_size;
113 enum AVPixelFormat pixel_format;
115 AVCaptureSession *capture_session;
116 AVCaptureVideoDataOutput *video_output;
117 AVCaptureAudioDataOutput *audio_output;
118 CMSampleBufferRef current_frame;
119 CMSampleBufferRef current_audio_frame;
122 static void lock_frames(AVFContext* ctx)
124 pthread_mutex_lock(&ctx->frame_lock);
127 static void unlock_frames(AVFContext* ctx)
129 pthread_mutex_unlock(&ctx->frame_lock);
132 /** FrameReciever class - delegate for AVCaptureSession
134 @interface AVFFrameReceiver : NSObject
136 AVFContext* _context;
139 - (id)initWithContext:(AVFContext*)context;
141 - (void) captureOutput:(AVCaptureOutput *)captureOutput
142 didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
143 fromConnection:(AVCaptureConnection *)connection;
147 @implementation AVFFrameReceiver
149 - (id)initWithContext:(AVFContext*)context
151 if (self = [super init]) {
157 - (void) captureOutput:(AVCaptureOutput *)captureOutput
158 didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
159 fromConnection:(AVCaptureConnection *)connection
161 lock_frames(_context);
163 if (_context->current_frame != nil) {
164 CFRelease(_context->current_frame);
167 _context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);
169 pthread_cond_signal(&_context->frame_wait_cond);
171 unlock_frames(_context);
173 ++_context->frames_captured;
178 /** AudioReciever class - delegate for AVCaptureSession
180 @interface AVFAudioReceiver : NSObject
182 AVFContext* _context;
185 - (id)initWithContext:(AVFContext*)context;
187 - (void) captureOutput:(AVCaptureOutput *)captureOutput
188 didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
189 fromConnection:(AVCaptureConnection *)connection;
193 @implementation AVFAudioReceiver
195 - (id)initWithContext:(AVFContext*)context
197 if (self = [super init]) {
203 - (void) captureOutput:(AVCaptureOutput *)captureOutput
204 didOutputSampleBuffer:(CMSampleBufferRef)audioFrame
205 fromConnection:(AVCaptureConnection *)connection
207 lock_frames(_context);
209 if (_context->current_audio_frame != nil) {
210 CFRelease(_context->current_audio_frame);
213 _context->current_audio_frame = (CMSampleBufferRef)CFRetain(audioFrame);
215 pthread_cond_signal(&_context->frame_wait_cond);
217 unlock_frames(_context);
219 ++_context->audio_frames_captured;
224 static void destroy_context(AVFContext* ctx)
226 [ctx->capture_session stopRunning];
228 [ctx->capture_session release];
229 [ctx->video_output release];
230 [ctx->audio_output release];
231 [ctx->avf_delegate release];
232 [ctx->avf_audio_delegate release];
234 ctx->capture_session = NULL;
235 ctx->video_output = NULL;
236 ctx->audio_output = NULL;
237 ctx->avf_delegate = NULL;
238 ctx->avf_audio_delegate = NULL;
240 av_freep(&ctx->audio_buffer);
242 pthread_mutex_destroy(&ctx->frame_lock);
243 pthread_cond_destroy(&ctx->frame_wait_cond);
245 if (ctx->current_frame) {
246 CFRelease(ctx->current_frame);
250 static void parse_device_name(AVFormatContext *s)
252 AVFContext *ctx = (AVFContext*)s->priv_data;
253 char *tmp = av_strdup(s->filename);
256 ctx->video_filename = strtok(tmp, ":");
257 ctx->audio_filename = strtok(NULL, ":");
259 ctx->audio_filename = strtok(tmp, ":");
263 static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
265 AVFContext *ctx = (AVFContext*)s->priv_data;
266 NSError *error = nil;
267 AVCaptureDeviceInput* capture_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];
269 if (!capture_dev_input) {
270 av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
271 [[error localizedDescription] UTF8String]);
275 if ([ctx->capture_session canAddInput:capture_dev_input]) {
276 [ctx->capture_session addInput:capture_dev_input];
278 av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
283 ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];
285 if (!ctx->video_output) {
286 av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
290 // select pixel format
291 struct AVFPixelFormatSpec pxl_fmt_spec;
292 pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
294 for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
295 if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
296 pxl_fmt_spec = avf_pixel_formats[i];
301 // check if selected pixel format is supported by AVFoundation
302 if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
303 av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
304 av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
308 // check if the pixel format is available for this device
309 if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
310 av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
311 av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
313 pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
315 av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
316 for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
317 struct AVFPixelFormatSpec pxl_fmt_dummy;
318 pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
319 for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
320 if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
321 pxl_fmt_dummy = avf_pixel_formats[i];
326 if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
327 av_log(s, AV_LOG_ERROR, " %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));
329 // select first supported pixel format instead of user selected (or default) pixel format
330 if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
331 pxl_fmt_spec = pxl_fmt_dummy;
336 // fail if there is no appropriate pixel format or print a warning about overriding the pixel format
337 if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
340 av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
341 av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
345 ctx->pixel_format = pxl_fmt_spec.ff_id;
346 NSNumber *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
347 NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format
348 forKey:(id)kCVPixelBufferPixelFormatTypeKey];
350 [ctx->video_output setVideoSettings:capture_dict];
351 [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
353 ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
355 dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
356 [ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
357 dispatch_release(queue);
359 if ([ctx->capture_session canAddOutput:ctx->video_output]) {
360 [ctx->capture_session addOutput:ctx->video_output];
362 av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
369 static int add_audio_device(AVFormatContext *s, AVCaptureDevice *audio_device)
371 AVFContext *ctx = (AVFContext*)s->priv_data;
372 NSError *error = nil;
373 AVCaptureDeviceInput* audio_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:audio_device error:&error] autorelease];
375 if (!audio_dev_input) {
376 av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
377 [[error localizedDescription] UTF8String]);
381 if ([ctx->capture_session canAddInput:audio_dev_input]) {
382 [ctx->capture_session addInput:audio_dev_input];
384 av_log(s, AV_LOG_ERROR, "can't add audio input to capture session\n");
389 ctx->audio_output = [[AVCaptureAudioDataOutput alloc] init];
391 if (!ctx->audio_output) {
392 av_log(s, AV_LOG_ERROR, "Failed to init AV audio output\n");
396 ctx->avf_audio_delegate = [[AVFAudioReceiver alloc] initWithContext:ctx];
398 dispatch_queue_t queue = dispatch_queue_create("avf_audio_queue", NULL);
399 [ctx->audio_output setSampleBufferDelegate:ctx->avf_audio_delegate queue:queue];
400 dispatch_release(queue);
402 if ([ctx->capture_session canAddOutput:ctx->audio_output]) {
403 [ctx->capture_session addOutput:ctx->audio_output];
405 av_log(s, AV_LOG_ERROR, "adding audio output to capture session failed\n");
412 static int get_video_config(AVFormatContext *s)
414 AVFContext *ctx = (AVFContext*)s->priv_data;
416 // Take stream info from the first frame.
417 while (ctx->frames_captured < 1) {
418 CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
423 AVStream* stream = avformat_new_stream(s, NULL);
429 ctx->video_stream_index = stream->index;
431 avpriv_set_pts_info(stream, 64, 1, avf_time_base);
433 CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
434 CGSize image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
436 stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
437 stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
438 stream->codec->width = (int)image_buffer_size.width;
439 stream->codec->height = (int)image_buffer_size.height;
440 stream->codec->pix_fmt = ctx->pixel_format;
442 CFRelease(ctx->current_frame);
443 ctx->current_frame = nil;
450 static int get_audio_config(AVFormatContext *s)
452 AVFContext *ctx = (AVFContext*)s->priv_data;
454 // Take stream info from the first frame.
455 while (ctx->audio_frames_captured < 1) {
456 CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
461 AVStream* stream = avformat_new_stream(s, NULL);
467 ctx->audio_stream_index = stream->index;
469 avpriv_set_pts_info(stream, 64, 1, avf_time_base);
471 CMFormatDescriptionRef format_desc = CMSampleBufferGetFormatDescription(ctx->current_audio_frame);
472 const AudioStreamBasicDescription *basic_desc = CMAudioFormatDescriptionGetStreamBasicDescription(format_desc);
475 av_log(s, AV_LOG_ERROR, "audio format not available\n");
479 stream->codec->codec_type = AVMEDIA_TYPE_AUDIO;
480 stream->codec->sample_rate = basic_desc->mSampleRate;
481 stream->codec->channels = basic_desc->mChannelsPerFrame;
482 stream->codec->channel_layout = av_get_default_channel_layout(stream->codec->channels);
484 ctx->audio_channels = basic_desc->mChannelsPerFrame;
485 ctx->audio_bits_per_sample = basic_desc->mBitsPerChannel;
486 ctx->audio_float = basic_desc->mFormatFlags & kAudioFormatFlagIsFloat;
487 ctx->audio_be = basic_desc->mFormatFlags & kAudioFormatFlagIsBigEndian;
488 ctx->audio_signed_integer = basic_desc->mFormatFlags & kAudioFormatFlagIsSignedInteger;
489 ctx->audio_packed = basic_desc->mFormatFlags & kAudioFormatFlagIsPacked;
490 ctx->audio_non_interleaved = basic_desc->mFormatFlags & kAudioFormatFlagIsNonInterleaved;
492 if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
495 stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
497 av_log(s, AV_LOG_ERROR, "audio format is not supported\n");
501 if (ctx->audio_non_interleaved) {
502 CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
503 ctx->audio_buffer_size = CMBlockBufferGetDataLength(block_buffer);
504 ctx->audio_buffer = av_malloc(ctx->audio_buffer_size);
505 if (!ctx->audio_buffer) {
506 av_log(s, AV_LOG_ERROR, "error allocating audio buffer\n");
511 CFRelease(ctx->current_audio_frame);
512 ctx->current_audio_frame = nil;
519 static int avf_read_header(AVFormatContext *s)
521 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
522 AVFContext *ctx = (AVFContext*)s->priv_data;
523 ctx->first_pts = av_gettime();
524 ctx->first_audio_pts = av_gettime();
526 pthread_mutex_init(&ctx->frame_lock, NULL);
527 pthread_cond_init(&ctx->frame_wait_cond, NULL);
529 // List devices if requested
530 if (ctx->list_devices) {
531 av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
532 NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
533 for (AVCaptureDevice *device in devices) {
534 const char *name = [[device localizedName] UTF8String];
535 int index = [devices indexOfObject:device];
536 av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
538 av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n");
539 devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
540 for (AVCaptureDevice *device in devices) {
541 const char *name = [[device localizedName] UTF8String];
542 int index = [devices indexOfObject:device];
543 av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
548 // Find capture device
549 AVCaptureDevice *video_device = nil;
550 AVCaptureDevice *audio_device = nil;
552 // parse input filename for video and audio device
553 parse_device_name(s);
555 // check for device index given in filename
556 if (ctx->video_device_index == -1 && ctx->video_filename) {
557 sscanf(ctx->video_filename, "%d", &ctx->video_device_index);
559 if (ctx->audio_device_index == -1 && ctx->audio_filename) {
560 sscanf(ctx->audio_filename, "%d", &ctx->audio_device_index);
563 if (ctx->video_device_index >= 0) {
564 NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
566 if (ctx->video_device_index >= [devices count]) {
567 av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
571 video_device = [devices objectAtIndex:ctx->video_device_index];
572 } else if (ctx->video_filename &&
573 strncmp(ctx->video_filename, "default", 7)) {
574 NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
576 for (AVCaptureDevice *device in devices) {
577 if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
578 video_device = device;
584 av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
588 video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
592 if (ctx->audio_device_index >= 0) {
593 NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
595 if (ctx->audio_device_index >= [devices count]) {
596 av_log(ctx, AV_LOG_ERROR, "Invalid audio device index\n");
600 audio_device = [devices objectAtIndex:ctx->audio_device_index];
601 } else if (ctx->audio_filename &&
602 strncmp(ctx->audio_filename, "default", 7)) {
603 NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
605 for (AVCaptureDevice *device in devices) {
606 if (!strncmp(ctx->audio_filename, [[device localizedName] UTF8String], strlen(ctx->audio_filename))) {
607 audio_device = device;
613 av_log(ctx, AV_LOG_ERROR, "Audio device not found\n");
617 audio_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
620 // Video nor Audio capture device not found, looking for AVMediaTypeVideo/Audio
621 if (!video_device && !audio_device) {
622 av_log(s, AV_LOG_ERROR, "No AV capture device found\n");
627 av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device localizedName] UTF8String]);
630 av_log(s, AV_LOG_DEBUG, "audio device '%s' opened\n", [[audio_device localizedName] UTF8String]);
633 // Initialize capture session
634 ctx->capture_session = [[AVCaptureSession alloc] init];
636 if (video_device && add_video_device(s, video_device)) {
639 if (audio_device && add_audio_device(s, audio_device)) {
642 [ctx->capture_session startRunning];
644 if (video_device && get_video_config(s)) {
649 if (audio_device && get_audio_config(s)) {
658 destroy_context(ctx);
662 static int avf_read_packet(AVFormatContext *s, AVPacket *pkt)
664 AVFContext* ctx = (AVFContext*)s->priv_data;
669 CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
671 if (ctx->current_frame != nil) {
672 if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) {
676 pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts,
679 pkt->stream_index = ctx->video_stream_index;
680 pkt->flags |= AV_PKT_FLAG_KEY;
682 CVPixelBufferLockBaseAddress(image_buffer, 0);
684 void* data = CVPixelBufferGetBaseAddress(image_buffer);
685 memcpy(pkt->data, data, pkt->size);
687 CVPixelBufferUnlockBaseAddress(image_buffer, 0);
688 CFRelease(ctx->current_frame);
689 ctx->current_frame = nil;
690 } else if (ctx->current_audio_frame != nil) {
691 CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame);
692 int block_buffer_size = CMBlockBufferGetDataLength(block_buffer);
694 if (!block_buffer || !block_buffer_size) {
698 if (ctx->audio_non_interleaved && block_buffer_size > ctx->audio_buffer_size) {
699 return AVERROR_BUFFER_TOO_SMALL;
702 if (av_new_packet(pkt, block_buffer_size) < 0) {
706 pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_audio_pts,
710 pkt->stream_index = ctx->audio_stream_index;
711 pkt->flags |= AV_PKT_FLAG_KEY;
713 if (ctx->audio_non_interleaved) {
714 int sample, c, shift;
716 OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, ctx->audio_buffer);
717 if (ret != kCMBlockBufferNoErr) {
721 int num_samples = pkt->size / (ctx->audio_channels * (ctx->audio_bits_per_sample >> 3));
723 // transform decoded frame into output format
724 #define INTERLEAVE_OUTPUT(bps) \
726 int##bps##_t **src; \
727 int##bps##_t *dest; \
728 src = av_malloc(ctx->audio_channels * sizeof(int##bps##_t*)); \
729 if (!src) return AVERROR(EIO); \
730 for (c = 0; c < ctx->audio_channels; c++) { \
731 src[c] = ((int##bps##_t*)ctx->audio_buffer) + c * num_samples; \
733 dest = (int##bps##_t*)pkt->data; \
734 shift = bps - ctx->audio_bits_per_sample; \
735 for (sample = 0; sample < num_samples; sample++) \
736 for (c = 0; c < ctx->audio_channels; c++) \
737 *dest++ = src[c][sample] << shift; \
741 if (ctx->audio_bits_per_sample <= 16) {
742 INTERLEAVE_OUTPUT(16)
744 INTERLEAVE_OUTPUT(32)
747 OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, pkt->data);
748 if (ret != kCMBlockBufferNoErr) {
753 CFRelease(ctx->current_audio_frame);
754 ctx->current_audio_frame = nil;
757 pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
761 } while (!pkt->data);
766 static int avf_close(AVFormatContext *s)
768 AVFContext* ctx = (AVFContext*)s->priv_data;
769 destroy_context(ctx);
773 static const AVOption options[] = {
774 { "frame_rate", "set frame rate", offsetof(AVFContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
775 { "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
776 { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
777 { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
778 { "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 },
779 { "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 },
780 { "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},
784 static const AVClass avf_class = {
785 .class_name = "AVFoundation input device",
786 .item_name = av_default_item_name,
788 .version = LIBAVUTIL_VERSION_INT,
789 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
792 AVInputFormat ff_avfoundation_demuxer = {
793 .name = "avfoundation",
794 .long_name = NULL_IF_CONFIG_SMALL("AVFoundation input device"),
795 .priv_data_size = sizeof(AVFContext),
796 .read_header = avf_read_header,
797 .read_packet = avf_read_packet,
798 .read_close = avf_close,
799 .flags = AVFMT_NOFILE,
800 .priv_class = &avf_class,