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FFmpeg/libavdevice/avfoundation.m

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/*
* AVFoundation input device
* Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
*
* 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 <thilo.borgmann@mail.de>
*/
#import <AVFoundation/AVFoundation.h>
#include <pthread.h>
#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,
};