/* * AVFoundation input device * Copyright (c) 2014 Thilo Borgmann * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * AVFoundation input device * @author Thilo Borgmann */ #import #include #include "libavutil/pixdesc.h" #include "libavutil/opt.h" #include "libavutil/avstring.h" #include "libavformat/internal.h" #include "libavutil/internal.h" #include "libavutil/time.h" #include "avdevice.h" static const int avf_time_base = 1000000; static const AVRational avf_time_base_q = { .num = 1, .den = avf_time_base }; struct AVFPixelFormatSpec { enum AVPixelFormat ff_id; OSType avf_id; }; static const struct AVFPixelFormatSpec avf_pixel_formats[] = { { AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome }, { AV_PIX_FMT_RGB555BE, kCVPixelFormatType_16BE555 }, { AV_PIX_FMT_RGB555LE, kCVPixelFormatType_16LE555 }, { AV_PIX_FMT_RGB565BE, kCVPixelFormatType_16BE565 }, { AV_PIX_FMT_RGB565LE, kCVPixelFormatType_16LE565 }, { AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB }, { AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR }, { AV_PIX_FMT_0RGB, kCVPixelFormatType_32ARGB }, { AV_PIX_FMT_BGR0, kCVPixelFormatType_32BGRA }, { AV_PIX_FMT_0BGR, kCVPixelFormatType_32ABGR }, { AV_PIX_FMT_RGB0, kCVPixelFormatType_32RGBA }, { AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB }, { AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 }, { AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R }, { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 }, { AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 }, { AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 }, { AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 }, { AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 }, { AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar }, { AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange }, { AV_PIX_FMT_YUYV422, kCVPixelFormatType_422YpCbCr8_yuvs }, #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080 { AV_PIX_FMT_GRAY8, kCVPixelFormatType_OneComponent8 }, #endif { AV_PIX_FMT_NONE, 0 } }; typedef struct { AVClass* class; int frames_captured; int audio_frames_captured; int64_t first_pts; int64_t first_audio_pts; pthread_mutex_t frame_lock; pthread_cond_t frame_wait_cond; id avf_delegate; id avf_audio_delegate; int list_devices; int video_device_index; int video_stream_index; int audio_device_index; int audio_stream_index; char *video_filename; char *audio_filename; int num_video_devices; int audio_channels; int audio_bits_per_sample; int audio_float; int audio_be; int audio_signed_integer; int audio_packed; int audio_non_interleaved; int32_t *audio_buffer; int audio_buffer_size; enum AVPixelFormat pixel_format; AVCaptureSession *capture_session; AVCaptureVideoDataOutput *video_output; AVCaptureAudioDataOutput *audio_output; CMSampleBufferRef current_frame; CMSampleBufferRef current_audio_frame; } AVFContext; static void lock_frames(AVFContext* ctx) { pthread_mutex_lock(&ctx->frame_lock); } static void unlock_frames(AVFContext* ctx) { pthread_mutex_unlock(&ctx->frame_lock); } /** FrameReciever class - delegate for AVCaptureSession */ @interface AVFFrameReceiver : NSObject { AVFContext* _context; } - (id)initWithContext:(AVFContext*)context; - (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)videoFrame fromConnection:(AVCaptureConnection *)connection; @end @implementation AVFFrameReceiver - (id)initWithContext:(AVFContext*)context { if (self = [super init]) { _context = context; } return self; } - (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)videoFrame fromConnection:(AVCaptureConnection *)connection { lock_frames(_context); if (_context->current_frame != nil) { CFRelease(_context->current_frame); } _context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame); pthread_cond_signal(&_context->frame_wait_cond); unlock_frames(_context); ++_context->frames_captured; } @end /** AudioReciever class - delegate for AVCaptureSession */ @interface AVFAudioReceiver : NSObject { AVFContext* _context; } - (id)initWithContext:(AVFContext*)context; - (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)audioFrame fromConnection:(AVCaptureConnection *)connection; @end @implementation AVFAudioReceiver - (id)initWithContext:(AVFContext*)context { if (self = [super init]) { _context = context; } return self; } - (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)audioFrame fromConnection:(AVCaptureConnection *)connection { lock_frames(_context); if (_context->current_audio_frame != nil) { CFRelease(_context->current_audio_frame); } _context->current_audio_frame = (CMSampleBufferRef)CFRetain(audioFrame); pthread_cond_signal(&_context->frame_wait_cond); unlock_frames(_context); ++_context->audio_frames_captured; } @end static void destroy_context(AVFContext* ctx) { [ctx->capture_session stopRunning]; [ctx->capture_session release]; [ctx->video_output release]; [ctx->audio_output release]; [ctx->avf_delegate release]; [ctx->avf_audio_delegate release]; ctx->capture_session = NULL; ctx->video_output = NULL; ctx->audio_output = NULL; ctx->avf_delegate = NULL; ctx->avf_audio_delegate = NULL; av_freep(&ctx->audio_buffer); pthread_mutex_destroy(&ctx->frame_lock); pthread_cond_destroy(&ctx->frame_wait_cond); if (ctx->current_frame) { CFRelease(ctx->current_frame); } } static void parse_device_name(AVFormatContext *s) { AVFContext *ctx = (AVFContext*)s->priv_data; char *tmp = av_strdup(s->filename); char *save; if (tmp[0] != ':') { ctx->video_filename = av_strtok(tmp, ":", &save); ctx->audio_filename = av_strtok(NULL, ":", &save); } else { ctx->audio_filename = av_strtok(tmp, ":", &save); } } static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device) { AVFContext *ctx = (AVFContext*)s->priv_data; NSError *error = nil; AVCaptureInput* capture_input = nil; if (ctx->video_device_index < ctx->num_video_devices) { capture_input = (AVCaptureInput*) [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease]; } else { capture_input = (AVCaptureInput*) video_device; } if (!capture_input) { av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n", [[error localizedDescription] UTF8String]); return 1; } if ([ctx->capture_session canAddInput:capture_input]) { [ctx->capture_session addInput:capture_input]; } else { av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n"); return 1; } // Attaching output ctx->video_output = [[AVCaptureVideoDataOutput alloc] init]; if (!ctx->video_output) { av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n"); return 1; } // select pixel format struct AVFPixelFormatSpec pxl_fmt_spec; pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE; for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) { if (ctx->pixel_format == avf_pixel_formats[i].ff_id) { pxl_fmt_spec = avf_pixel_formats[i]; break; } } // check if selected pixel format is supported by AVFoundation if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) { av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n", av_get_pix_fmt_name(pxl_fmt_spec.ff_id)); return 1; } // check if the pixel format is available for this device if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) { av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n", av_get_pix_fmt_name(pxl_fmt_spec.ff_id)); pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE; av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n"); for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) { struct AVFPixelFormatSpec pxl_fmt_dummy; pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE; for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) { if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) { pxl_fmt_dummy = avf_pixel_formats[i]; break; } } if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) { av_log(s, AV_LOG_ERROR, " %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id)); // select first supported pixel format instead of user selected (or default) pixel format if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) { pxl_fmt_spec = pxl_fmt_dummy; } } } // fail if there is no appropriate pixel format or print a warning about overriding the pixel format if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) { return 1; } else { av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n", av_get_pix_fmt_name(pxl_fmt_spec.ff_id)); } } ctx->pixel_format = pxl_fmt_spec.ff_id; NSNumber *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id]; NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format forKey:(id)kCVPixelBufferPixelFormatTypeKey]; [ctx->video_output setVideoSettings:capture_dict]; [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES]; ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx]; dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL); [ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue]; dispatch_release(queue); if ([ctx->capture_session canAddOutput:ctx->video_output]) { [ctx->capture_session addOutput:ctx->video_output]; } else { av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n"); return 1; } return 0; } static int add_audio_device(AVFormatContext *s, AVCaptureDevice *audio_device) { AVFContext *ctx = (AVFContext*)s->priv_data; NSError *error = nil; AVCaptureDeviceInput* audio_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:audio_device error:&error] autorelease]; if (!audio_dev_input) { av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n", [[error localizedDescription] UTF8String]); return 1; } if ([ctx->capture_session canAddInput:audio_dev_input]) { [ctx->capture_session addInput:audio_dev_input]; } else { av_log(s, AV_LOG_ERROR, "can't add audio input to capture session\n"); return 1; } // Attaching output ctx->audio_output = [[AVCaptureAudioDataOutput alloc] init]; if (!ctx->audio_output) { av_log(s, AV_LOG_ERROR, "Failed to init AV audio output\n"); return 1; } ctx->avf_audio_delegate = [[AVFAudioReceiver alloc] initWithContext:ctx]; dispatch_queue_t queue = dispatch_queue_create("avf_audio_queue", NULL); [ctx->audio_output setSampleBufferDelegate:ctx->avf_audio_delegate queue:queue]; dispatch_release(queue); if ([ctx->capture_session canAddOutput:ctx->audio_output]) { [ctx->capture_session addOutput:ctx->audio_output]; } else { av_log(s, AV_LOG_ERROR, "adding audio output to capture session failed\n"); return 1; } return 0; } static int get_video_config(AVFormatContext *s) { AVFContext *ctx = (AVFContext*)s->priv_data; // Take stream info from the first frame. while (ctx->frames_captured < 1) { CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES); } lock_frames(ctx); AVStream* stream = avformat_new_stream(s, NULL); if (!stream) { return 1; } ctx->video_stream_index = stream->index; avpriv_set_pts_info(stream, 64, 1, avf_time_base); CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame); CGSize image_buffer_size = CVImageBufferGetEncodedSize(image_buffer); stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO; stream->codec->codec_type = AVMEDIA_TYPE_VIDEO; stream->codec->width = (int)image_buffer_size.width; stream->codec->height = (int)image_buffer_size.height; stream->codec->pix_fmt = ctx->pixel_format; CFRelease(ctx->current_frame); ctx->current_frame = nil; unlock_frames(ctx); return 0; } static int get_audio_config(AVFormatContext *s) { AVFContext *ctx = (AVFContext*)s->priv_data; // Take stream info from the first frame. while (ctx->audio_frames_captured < 1) { CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES); } lock_frames(ctx); AVStream* stream = avformat_new_stream(s, NULL); if (!stream) { return 1; } ctx->audio_stream_index = stream->index; avpriv_set_pts_info(stream, 64, 1, avf_time_base); CMFormatDescriptionRef format_desc = CMSampleBufferGetFormatDescription(ctx->current_audio_frame); const AudioStreamBasicDescription *basic_desc = CMAudioFormatDescriptionGetStreamBasicDescription(format_desc); if (!basic_desc) { av_log(s, AV_LOG_ERROR, "audio format not available\n"); return 1; } stream->codec->codec_type = AVMEDIA_TYPE_AUDIO; stream->codec->sample_rate = basic_desc->mSampleRate; stream->codec->channels = basic_desc->mChannelsPerFrame; stream->codec->channel_layout = av_get_default_channel_layout(stream->codec->channels); ctx->audio_channels = basic_desc->mChannelsPerFrame; ctx->audio_bits_per_sample = basic_desc->mBitsPerChannel; ctx->audio_float = basic_desc->mFormatFlags & kAudioFormatFlagIsFloat; ctx->audio_be = basic_desc->mFormatFlags & kAudioFormatFlagIsBigEndian; ctx->audio_signed_integer = basic_desc->mFormatFlags & kAudioFormatFlagIsSignedInteger; ctx->audio_packed = basic_desc->mFormatFlags & kAudioFormatFlagIsPacked; ctx->audio_non_interleaved = basic_desc->mFormatFlags & kAudioFormatFlagIsNonInterleaved; if (basic_desc->mFormatID == kAudioFormatLinearPCM && ctx->audio_float && ctx->audio_packed) { stream->codec->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE; } else { av_log(s, AV_LOG_ERROR, "audio format is not supported\n"); return 1; } if (ctx->audio_non_interleaved) { CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame); ctx->audio_buffer_size = CMBlockBufferGetDataLength(block_buffer); ctx->audio_buffer = av_malloc(ctx->audio_buffer_size); if (!ctx->audio_buffer) { av_log(s, AV_LOG_ERROR, "error allocating audio buffer\n"); return 1; } } CFRelease(ctx->current_audio_frame); ctx->current_audio_frame = nil; unlock_frames(ctx); return 0; } static int avf_read_header(AVFormatContext *s) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; AVFContext *ctx = (AVFContext*)s->priv_data; ctx->first_pts = av_gettime(); ctx->first_audio_pts = av_gettime(); uint32_t num_screens = 0; pthread_mutex_init(&ctx->frame_lock, NULL); pthread_cond_init(&ctx->frame_wait_cond, NULL); #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070 CGGetActiveDisplayList(0, NULL, &num_screens); #endif // List devices if requested if (ctx->list_devices) { av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n"); NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; int index = 0; for (AVCaptureDevice *device in devices) { const char *name = [[device localizedName] UTF8String]; index = [devices indexOfObject:device]; av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name); index++; } #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070 if (num_screens > 0) { CGDirectDisplayID screens[num_screens]; CGGetActiveDisplayList(num_screens, screens, &num_screens); for (int i = 0; i < num_screens; i++) { av_log(ctx, AV_LOG_INFO, "[%d] Capture screen %d\n", index + i, i); } } #endif av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n"); devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio]; for (AVCaptureDevice *device in devices) { const char *name = [[device localizedName] UTF8String]; int index = [devices indexOfObject:device]; av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name); } goto fail; } // Find capture device AVCaptureDevice *video_device = nil; AVCaptureDevice *audio_device = nil; NSArray *video_devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; ctx->num_video_devices = [video_devices count]; // parse input filename for video and audio device parse_device_name(s); // check for device index given in filename if (ctx->video_device_index == -1 && ctx->video_filename) { sscanf(ctx->video_filename, "%d", &ctx->video_device_index); } if (ctx->audio_device_index == -1 && ctx->audio_filename) { sscanf(ctx->audio_filename, "%d", &ctx->audio_device_index); } if (ctx->video_device_index >= 0) { if (ctx->video_device_index < ctx->num_video_devices) { video_device = [video_devices objectAtIndex:ctx->video_device_index]; } else if (ctx->video_device_index < ctx->num_video_devices + num_screens) { #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070 CGDirectDisplayID screens[num_screens]; CGGetActiveDisplayList(num_screens, screens, &num_screens); AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[ctx->video_device_index - ctx->num_video_devices]] autorelease]; video_device = (AVCaptureDevice*) capture_screen_input; #endif } else { av_log(ctx, AV_LOG_ERROR, "Invalid device index\n"); goto fail; } } else if (ctx->video_filename && strncmp(ctx->video_filename, "none", 4)) { if (!strncmp(ctx->video_filename, "default", 7)) { video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; } else { // looking for video inputs for (AVCaptureDevice *device in video_devices) { if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) { video_device = device; break; } } #if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070 // looking for screen inputs if (!video_device) { int idx; if(sscanf(ctx->video_filename, "Capture screen %d", &idx) && idx < num_screens) { CGDirectDisplayID screens[num_screens]; CGGetActiveDisplayList(num_screens, screens, &num_screens); AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease]; video_device = (AVCaptureDevice*) capture_screen_input; ctx->video_device_index = ctx->num_video_devices + idx; } } #endif } if (!video_device) { av_log(ctx, AV_LOG_ERROR, "Video device not found\n"); goto fail; } } // get audio device if (ctx->audio_device_index >= 0) { NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio]; if (ctx->audio_device_index >= [devices count]) { av_log(ctx, AV_LOG_ERROR, "Invalid audio device index\n"); goto fail; } audio_device = [devices objectAtIndex:ctx->audio_device_index]; } else if (ctx->audio_filename && strncmp(ctx->audio_filename, "none", 4)) { if (!strncmp(ctx->audio_filename, "default", 7)) { audio_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio]; } else { NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio]; for (AVCaptureDevice *device in devices) { if (!strncmp(ctx->audio_filename, [[device localizedName] UTF8String], strlen(ctx->audio_filename))) { audio_device = device; break; } } } if (!audio_device) { av_log(ctx, AV_LOG_ERROR, "Audio device not found\n"); goto fail; } } // Video nor Audio capture device not found, looking for AVMediaTypeVideo/Audio if (!video_device && !audio_device) { av_log(s, AV_LOG_ERROR, "No AV capture device found\n"); goto fail; } if (video_device) { if (ctx->video_device_index < ctx->num_video_devices) { av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device localizedName] UTF8String]); } else { av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device description] UTF8String]); } } if (audio_device) { av_log(s, AV_LOG_DEBUG, "audio device '%s' opened\n", [[audio_device localizedName] UTF8String]); } // Initialize capture session ctx->capture_session = [[AVCaptureSession alloc] init]; if (video_device && add_video_device(s, video_device)) { goto fail; } if (audio_device && add_audio_device(s, audio_device)) { } [ctx->capture_session startRunning]; if (video_device && get_video_config(s)) { goto fail; } // set audio stream if (audio_device && get_audio_config(s)) { goto fail; } [pool release]; return 0; fail: [pool release]; destroy_context(ctx); return AVERROR(EIO); } static int avf_read_packet(AVFormatContext *s, AVPacket *pkt) { AVFContext* ctx = (AVFContext*)s->priv_data; do { lock_frames(ctx); CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame); if (ctx->current_frame != nil) { if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) { return AVERROR(EIO); } pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts, AV_TIME_BASE_Q, avf_time_base_q); pkt->stream_index = ctx->video_stream_index; pkt->flags |= AV_PKT_FLAG_KEY; CVPixelBufferLockBaseAddress(image_buffer, 0); void* data = CVPixelBufferGetBaseAddress(image_buffer); memcpy(pkt->data, data, pkt->size); CVPixelBufferUnlockBaseAddress(image_buffer, 0); CFRelease(ctx->current_frame); ctx->current_frame = nil; } else if (ctx->current_audio_frame != nil) { CMBlockBufferRef block_buffer = CMSampleBufferGetDataBuffer(ctx->current_audio_frame); int block_buffer_size = CMBlockBufferGetDataLength(block_buffer); if (!block_buffer || !block_buffer_size) { return AVERROR(EIO); } if (ctx->audio_non_interleaved && block_buffer_size > ctx->audio_buffer_size) { return AVERROR_BUFFER_TOO_SMALL; } if (av_new_packet(pkt, block_buffer_size) < 0) { return AVERROR(EIO); } pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_audio_pts, AV_TIME_BASE_Q, avf_time_base_q); pkt->stream_index = ctx->audio_stream_index; pkt->flags |= AV_PKT_FLAG_KEY; if (ctx->audio_non_interleaved) { int sample, c, shift; OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, ctx->audio_buffer); if (ret != kCMBlockBufferNoErr) { return AVERROR(EIO); } int num_samples = pkt->size / (ctx->audio_channels * (ctx->audio_bits_per_sample >> 3)); // transform decoded frame into output format #define INTERLEAVE_OUTPUT(bps) \ { \ int##bps##_t **src; \ int##bps##_t *dest; \ src = av_malloc(ctx->audio_channels * sizeof(int##bps##_t*)); \ if (!src) return AVERROR(EIO); \ for (c = 0; c < ctx->audio_channels; c++) { \ src[c] = ((int##bps##_t*)ctx->audio_buffer) + c * num_samples; \ } \ dest = (int##bps##_t*)pkt->data; \ shift = bps - ctx->audio_bits_per_sample; \ for (sample = 0; sample < num_samples; sample++) \ for (c = 0; c < ctx->audio_channels; c++) \ *dest++ = src[c][sample] << shift; \ av_freep(&src); \ } if (ctx->audio_bits_per_sample <= 16) { INTERLEAVE_OUTPUT(16) } else { INTERLEAVE_OUTPUT(32) } } else { OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, pkt->data); if (ret != kCMBlockBufferNoErr) { return AVERROR(EIO); } } CFRelease(ctx->current_audio_frame); ctx->current_audio_frame = nil; } else { pkt->data = NULL; pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock); } unlock_frames(ctx); } while (!pkt->data); return 0; } static int avf_close(AVFormatContext *s) { AVFContext* ctx = (AVFContext*)s->priv_data; destroy_context(ctx); return 0; } static const AVOption options[] = { { "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" }, { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" }, { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" }, { "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 }, { "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 }, { "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}, { NULL }, }; static const AVClass avf_class = { .class_name = "AVFoundation input device", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, }; AVInputFormat ff_avfoundation_demuxer = { .name = "avfoundation", .long_name = NULL_IF_CONFIG_SMALL("AVFoundation input device"), .priv_data_size = sizeof(AVFContext), .read_header = avf_read_header, .read_packet = avf_read_packet, .read_close = avf_close, .flags = AVFMT_NOFILE, .priv_class = &avf_class, };