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0c6203c97a
ffmpeg/libavdevice/avfoundation.m
Andreas Rheinhardt 0c6203c97a all: Don't set AVClass.item_name to its default value 
Unnecessary since acf63d5350adeae551d412db699f8ca03f7e76b9;
also avoids relocations.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-12-22 15:12:33 +01:00

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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/channel_layout.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavformat/internal.h"
#include "libavutil/internal.h"
#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#include "libavutil/imgutils.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 !TARGET_OS_IPHONE && __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;
pthread_mutex_t frame_lock;
id avf_delegate;
id avf_audio_delegate;
AVRational framerate;
int width, height;
int capture_cursor;
int capture_mouse_clicks;
int capture_raw_data;
int drop_late_frames;
int video_is_muxed;
int video_is_screen;
int list_devices;
int video_device_index;
int video_stream_index;
int audio_device_index;
int audio_stream_index;
char *url;
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;
AVCaptureDevice *observed_device;
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
AVCaptureDeviceTransportControlsPlaybackMode observed_mode;
#endif
int observed_quit;
} 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;
// start observing if a device is set for it
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
if (_context->observed_device) {
NSString *keyPath = NSStringFromSelector(@selector(transportControlsPlaybackMode));
NSKeyValueObservingOptions options = NSKeyValueObservingOptionNew;
[_context->observed_device addObserver: self
forKeyPath: keyPath
options: options
context: _context];
}
#endif
}
return self;
}
- (void)dealloc {
// stop observing if a device is set for it
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
if (_context->observed_device) {
NSString *keyPath = NSStringFromSelector(@selector(transportControlsPlaybackMode));
[_context->observed_device removeObserver: self forKeyPath: keyPath];
}
#endif
[super dealloc];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context {
if (context == _context) {
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
AVCaptureDeviceTransportControlsPlaybackMode mode =
[change[NSKeyValueChangeNewKey] integerValue];
if (mode != _context->observed_mode) {
if (mode == AVCaptureDeviceTransportControlsNotPlayingMode) {
_context->observed_quit = 1;
}
_context->observed_mode = mode;
}
#endif
} else {
[super observeValueForKeyPath: keyPath
ofObject: object
change: change
context: context];
}
}
- (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);
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);
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->url);
av_freep(&ctx->audio_buffer);
pthread_mutex_destroy(&ctx->frame_lock);
if (ctx->current_frame) {
CFRelease(ctx->current_frame);
}
}
static int parse_device_name(AVFormatContext *s)
{
AVFContext *ctx = (AVFContext*)s->priv_data;
char *save;
ctx->url = av_strdup(s->url);
if (!ctx->url)
return AVERROR(ENOMEM);
if (ctx->url[0] != ':') {
ctx->video_filename = av_strtok(ctx->url, ":", &save);
ctx->audio_filename = av_strtok(NULL, ":", &save);
} else {
ctx->audio_filename = av_strtok(ctx->url, ":", &save);
}
return 0;
}
/**
* Configure the video device.
*
* Configure the video device using a run-time approach to access properties
* since formats, activeFormat are available since iOS >= 7.0 or OSX >= 10.7
* and activeVideoMaxFrameDuration is available since i0S >= 7.0 and OSX >= 10.9.
*
* The NSUndefinedKeyException must be handled by the caller of this function.
*
*/
static int configure_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
{
AVFContext *ctx = (AVFContext*)s->priv_data;
double framerate = av_q2d(ctx->framerate);
NSObject *range = nil;
NSObject *format = nil;
NSObject *selected_range = nil;
NSObject *selected_format = nil;
// try to configure format by formats list
// might raise an exception if no format list is given
// (then fallback to default, no configuration)
@try {
for (format in [video_device valueForKey:@"formats"]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
if ((ctx->width == 0 && ctx->height == 0) ||
(dimensions.width == ctx->width && dimensions.height == ctx->height)) {
selected_format = format;
for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
double max_framerate;
[[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
if (fabs (framerate - max_framerate) < 0.01) {
selected_range = range;
break;
}
}
}
}
if (!selected_format) {
av_log(s, AV_LOG_ERROR, "Selected video size (%dx%d) is not supported by the device.\n",
ctx->width, ctx->height);
goto unsupported_format;
}
if (!selected_range) {
av_log(s, AV_LOG_ERROR, "Selected framerate (%f) is not supported by the device.\n",
framerate);
if (ctx->video_is_muxed) {
av_log(s, AV_LOG_ERROR, "Falling back to default.\n");
} else {
goto unsupported_format;
}
}
if ([video_device lockForConfiguration:NULL] == YES) {
if (selected_format) {
[video_device setValue:selected_format forKey:@"activeFormat"];
}
if (selected_range) {
NSValue *min_frame_duration = [selected_range valueForKey:@"minFrameDuration"];
[video_device setValue:min_frame_duration forKey:@"activeVideoMinFrameDuration"];
[video_device setValue:min_frame_duration forKey:@"activeVideoMaxFrameDuration"];
}
} else {
av_log(s, AV_LOG_ERROR, "Could not lock device for configuration.\n");
return AVERROR(EINVAL);
}
} @catch(NSException *e) {
av_log(ctx, AV_LOG_WARNING, "Configuration of video device failed, falling back to default.\n");
}
return 0;
unsupported_format:
av_log(s, AV_LOG_ERROR, "Supported modes:\n");
for (format in [video_device valueForKey:@"formats"]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef) [format performSelector:@selector(formatDescription)];
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
for (range in [format valueForKey:@"videoSupportedFrameRateRanges"]) {
double min_framerate;
double max_framerate;
[[range valueForKey:@"minFrameRate"] getValue:&min_framerate];
[[range valueForKey:@"maxFrameRate"] getValue:&max_framerate];
av_log(s, AV_LOG_ERROR, " %dx%d@[%f %f]fps\n",
dimensions.width, dimensions.height,
min_framerate, max_framerate);
}
}
return AVERROR(EINVAL);
}
static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
{
AVFContext *ctx = (AVFContext*)s->priv_data;
int ret;
NSError *error = nil;
AVCaptureInput* capture_input = nil;
struct AVFPixelFormatSpec pxl_fmt_spec;
NSNumber *pixel_format;
NSDictionary *capture_dict;
dispatch_queue_t queue;
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;
}
// Configure device framerate and video size
@try {
if ((ret = configure_video_device(s, video_device)) < 0) {
return ret;
}
} @catch (NSException *exception) {
if (![[exception name] isEqualToString:NSUndefinedKeyException]) {
av_log (s, AV_LOG_ERROR, "An error occurred: %s", [exception.reason UTF8String]);
return AVERROR_EXTERNAL;
}
}
// select pixel format
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));
}
}
// set videoSettings to an empty dict for receiving raw data of muxed devices
if (ctx->capture_raw_data) {
ctx->pixel_format = pxl_fmt_spec.ff_id;
ctx->video_output.videoSettings = @{ };
} else {
ctx->pixel_format = pxl_fmt_spec.ff_id;
pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
capture_dict = [NSDictionary dictionaryWithObject:pixel_format
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
[ctx->video_output setVideoSettings:capture_dict];
}
[ctx->video_output setAlwaysDiscardsLateVideoFrames:ctx->drop_late_frames];
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
// check for transport control support and set observer device if supported
if (!ctx->video_is_screen) {
int trans_ctrl = [video_device transportControlsSupported];
AVCaptureDeviceTransportControlsPlaybackMode trans_mode = [video_device transportControlsPlaybackMode];
if (trans_ctrl) {
ctx->observed_mode = trans_mode;
ctx->observed_device = video_device;
}
}
#endif
ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
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];
dispatch_queue_t queue;
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];
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;
CVImageBufferRef image_buffer;
CMBlockBufferRef block_buffer;
CGSize image_buffer_size;
AVStream* stream = avformat_new_stream(s, NULL);
if (!stream) {
return 1;
}
// Take stream info from the first frame.
while (ctx->frames_captured < 1) {
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
}
lock_frames(ctx);
ctx->video_stream_index = stream->index;
avpriv_set_pts_info(stream, 64, 1, avf_time_base);
image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
block_buffer = CMSampleBufferGetDataBuffer(ctx->current_frame);
if (image_buffer) {
image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
stream->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
stream->codecpar->width = (int)image_buffer_size.width;
stream->codecpar->height = (int)image_buffer_size.height;
stream->codecpar->format = ctx->pixel_format;
} else {
stream->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
stream->codecpar->format = 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;
CMFormatDescriptionRef format_desc;
AVStream* stream = avformat_new_stream(s, NULL);
if (!stream) {
return 1;
}
// Take stream info from the first frame.
while (ctx->audio_frames_captured < 1) {
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
}
lock_frames(ctx);
ctx->audio_stream_index = stream->index;
avpriv_set_pts_info(stream, 64, 1, avf_time_base);
format_desc = CMSampleBufferGetFormatDescription(ctx->current_audio_frame);
const AudioStreamBasicDescription *basic_desc = CMAudioFormatDescriptionGetStreamBasicDescription(format_desc);
if (!basic_desc) {
unlock_frames(ctx);
av_log(s, AV_LOG_ERROR, "audio format not available\n");
return 1;
}
stream->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
stream->codecpar->sample_rate = basic_desc->mSampleRate;
av_channel_layout_default(&stream->codecpar->ch_layout, basic_desc->mChannelsPerFrame);
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_bits_per_sample == 32 &&
ctx->audio_packed) {
stream->codecpar->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
} else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
ctx->audio_signed_integer &&
ctx->audio_bits_per_sample == 16 &&
ctx->audio_packed) {
stream->codecpar->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S16BE : AV_CODEC_ID_PCM_S16LE;
} else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
ctx->audio_signed_integer &&
ctx->audio_bits_per_sample == 24 &&
ctx->audio_packed) {
stream->codecpar->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
} else if (basic_desc->mFormatID == kAudioFormatLinearPCM &&
ctx->audio_signed_integer &&
ctx->audio_bits_per_sample == 32 &&
ctx->audio_packed) {
stream->codecpar->codec_id = ctx->audio_be ? AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
} else {
unlock_frames(ctx);
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) {
unlock_frames(ctx);
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 NSArray* getDevicesWithMediaType(AVMediaType mediaType) {
#if ((TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000) || (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101500))
NSMutableArray *deviceTypes = nil;
if (mediaType == AVMediaTypeVideo) {
deviceTypes = [NSMutableArray arrayWithArray:@[AVCaptureDeviceTypeBuiltInWideAngleCamera]];
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000)
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInDualCamera];
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInTelephotoCamera];
#endif
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 110100)
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInTrueDepthCamera];
#endif
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 130000)
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInTripleCamera];
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInDualWideCamera];
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInUltraWideCamera];
#endif
#if (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED >= 130000)
[deviceTypes addObject: AVCaptureDeviceTypeDeskViewCamera];
#endif
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 150400)
[deviceTypes addObject: AVCaptureDeviceTypeBuiltInLiDARDepthCamera];
#endif
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 170000 || (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000))
[deviceTypes addObject: AVCaptureDeviceTypeContinuityCamera];
#endif
} else if (mediaType == AVMediaTypeAudio) {
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 170000 || (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000))
deviceTypes = [NSMutableArray arrayWithArray:@[AVCaptureDeviceTypeMicrophone]];
#else
deviceTypes = [NSMutableArray arrayWithArray:@[AVCaptureDeviceTypeBuiltInMicrophone]];
#endif
} else if (mediaType == AVMediaTypeMuxed) {
#if (TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 170000 || (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000))
deviceTypes = [NSMutableArray arrayWithArray:@[AVCaptureDeviceTypeExternal]];
#elif (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 140000)
deviceTypes = [NSMutableArray arrayWithArray:@[AVCaptureDeviceTypeExternalUnknown]];
#else
return nil;
#endif
} else {
return nil;
}
AVCaptureDeviceDiscoverySession *captureDeviceDiscoverySession =
[AVCaptureDeviceDiscoverySession
discoverySessionWithDeviceTypes:deviceTypes
mediaType:mediaType
position:AVCaptureDevicePositionUnspecified];
return [captureDeviceDiscoverySession devices];
#else
return [AVCaptureDevice devicesWithMediaType:mediaType];
#endif
}
static int avf_read_header(AVFormatContext *s)
{
int ret = 0;
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
uint32_t num_screens = 0;
AVFContext *ctx = (AVFContext*)s->priv_data;
AVCaptureDevice *video_device = nil;
AVCaptureDevice *audio_device = nil;
// Find capture device
NSArray *devices = getDevicesWithMediaType(AVMediaTypeVideo);
NSArray *devices_muxed = getDevicesWithMediaType(AVMediaTypeMuxed);
ctx->num_video_devices = [devices count] + [devices_muxed count];
pthread_mutex_init(&ctx->frame_lock, NULL);
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
CGGetActiveDisplayList(0, NULL, &num_screens);
#endif
// List devices if requested
if (ctx->list_devices) {
int index = 0;
av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
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);
}
for (AVCaptureDevice *device in devices_muxed) {
const char *name = [[device localizedName] UTF8String];
index = [devices count] + [devices_muxed indexOfObject:device];
av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
}
#if !TARGET_OS_IPHONE && __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", ctx->num_video_devices + i, i);
}
}
#endif
av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n");
devices = getDevicesWithMediaType(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;
}
// parse input filename for video and audio device
ret = parse_device_name(s);
if (ret)
goto fail;
// 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) {
if (ctx->video_device_index < [devices count]) {
video_device = [devices objectAtIndex:ctx->video_device_index];
} else {
video_device = [devices_muxed objectAtIndex:(ctx->video_device_index - [devices count])];
ctx->video_is_muxed = 1;
}
} else if (ctx->video_device_index < ctx->num_video_devices + num_screens) {
#if !TARGET_OS_IPHONE && __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];
if (ctx->framerate.num > 0) {
capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
}
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
if (ctx->capture_cursor) {
capture_screen_input.capturesCursor = YES;
} else {
capture_screen_input.capturesCursor = NO;
}
#endif
if (ctx->capture_mouse_clicks) {
capture_screen_input.capturesMouseClicks = YES;
} else {
capture_screen_input.capturesMouseClicks = NO;
}
video_device = (AVCaptureDevice*) capture_screen_input;
ctx->video_is_screen = 1;
#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 devices) {
if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
video_device = device;
break;
}
}
// looking for muxed inputs
for (AVCaptureDevice *device in devices_muxed) {
if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
video_device = device;
ctx->video_is_muxed = 1;
break;
}
}
#if !TARGET_OS_IPHONE && __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;
ctx->video_is_screen = 1;
if (ctx->framerate.num > 0) {
capture_screen_input.minFrameDuration = CMTimeMake(ctx->framerate.den, ctx->framerate.num);
}
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
if (ctx->capture_cursor) {
capture_screen_input.capturesCursor = YES;
} else {
capture_screen_input.capturesCursor = NO;
}
#endif
if (ctx->capture_mouse_clicks) {
capture_screen_input.capturesMouseClicks = YES;
} else {
capture_screen_input.capturesMouseClicks = NO;
}
}
}
#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 = getDevicesWithMediaType(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 = getDevicesWithMediaType(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];
/* Unlock device configuration only after the session is started so it
* does not reset the capture formats */
if (!ctx->video_is_screen) {
[video_device unlockForConfiguration];
}
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);
if (ret)
return ret;
return AVERROR(EIO);
}
static int copy_cvpixelbuffer(AVFormatContext *s,
CVPixelBufferRef image_buffer,
AVPacket *pkt)
{
AVFContext *ctx = s->priv_data;
int src_linesize[4];
const uint8_t *src_data[4];
int width = CVPixelBufferGetWidth(image_buffer);
int height = CVPixelBufferGetHeight(image_buffer);
int status;
memset(src_linesize, 0, sizeof(src_linesize));
memset(src_data, 0, sizeof(src_data));
status = CVPixelBufferLockBaseAddress(image_buffer, 0);
if (status != kCVReturnSuccess) {
av_log(s, AV_LOG_ERROR, "Could not lock base address: %d (%dx%d)\n", status, width, height);
return AVERROR_EXTERNAL;
}
if (CVPixelBufferIsPlanar(image_buffer)) {
size_t plane_count = CVPixelBufferGetPlaneCount(image_buffer);
int i;
for(i = 0; i < plane_count; i++){
src_linesize[i] = CVPixelBufferGetBytesPerRowOfPlane(image_buffer, i);
src_data[i] = CVPixelBufferGetBaseAddressOfPlane(image_buffer, i);
}
} else {
src_linesize[0] = CVPixelBufferGetBytesPerRow(image_buffer);
src_data[0] = CVPixelBufferGetBaseAddress(image_buffer);
}
status = av_image_copy_to_buffer(pkt->data, pkt->size,
src_data, src_linesize,
ctx->pixel_format, width, height, 1);
CVPixelBufferUnlockBaseAddress(image_buffer, 0);
return status;
}
static int avf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVFContext* ctx = (AVFContext*)s->priv_data;
do {
CVImageBufferRef image_buffer;
CMBlockBufferRef block_buffer;
lock_frames(ctx);
if (ctx->current_frame != nil) {
int status;
int length = 0;
image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
block_buffer = CMSampleBufferGetDataBuffer(ctx->current_frame);
if (image_buffer != nil) {
length = (int)CVPixelBufferGetDataSize(image_buffer);
} else if (block_buffer != nil) {
length = (int)CMBlockBufferGetDataLength(block_buffer);
} else {
unlock_frames(ctx);
return AVERROR(EINVAL);
}
if (av_new_packet(pkt, length) < 0) {
unlock_frames(ctx);
return AVERROR(EIO);
}
CMItemCount count;
CMSampleTimingInfo timing_info;
if (CMSampleBufferGetOutputSampleTimingInfoArray(ctx->current_frame, 1, &timing_info, &count) == noErr) {
AVRational timebase_q = av_make_q(1, timing_info.presentationTimeStamp.timescale);
pkt->pts = pkt->dts = av_rescale_q(timing_info.presentationTimeStamp.value, timebase_q, avf_time_base_q);
}
pkt->stream_index = ctx->video_stream_index;
pkt->flags |= AV_PKT_FLAG_KEY;
if (image_buffer) {
status = copy_cvpixelbuffer(s, image_buffer, pkt);
} else {
status = 0;
OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, pkt->data);
if (ret != kCMBlockBufferNoErr) {
status = AVERROR(EIO);
}
}
CFRelease(ctx->current_frame);
ctx->current_frame = nil;
if (status < 0) {
unlock_frames(ctx);
return status;
}
} 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) {
unlock_frames(ctx);
return AVERROR(EIO);
}
if (ctx->audio_non_interleaved && block_buffer_size > ctx->audio_buffer_size) {
unlock_frames(ctx);
return AVERROR_BUFFER_TOO_SMALL;
}
if (av_new_packet(pkt, block_buffer_size) < 0) {
unlock_frames(ctx);
return AVERROR(EIO);
}
CMItemCount count;
CMSampleTimingInfo timing_info;
if (CMSampleBufferGetOutputSampleTimingInfoArray(ctx->current_audio_frame, 1, &timing_info, &count) == noErr) {
AVRational timebase_q = av_make_q(1, timing_info.presentationTimeStamp.timescale);
pkt->pts = pkt->dts = av_rescale_q(timing_info.presentationTimeStamp.value, timebase_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, num_samples;
OSStatus ret = CMBlockBufferCopyDataBytes(block_buffer, 0, pkt->size, ctx->audio_buffer);
if (ret != kCMBlockBufferNoErr) {
unlock_frames(ctx);
return AVERROR(EIO);
}
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) { \
unlock_frames(ctx); \
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) {
unlock_frames(ctx);
return AVERROR(EIO);
}
}
CFRelease(ctx->current_audio_frame);
ctx->current_audio_frame = nil;
} else {
pkt->data = NULL;
unlock_frames(ctx);
if (ctx->observed_quit) {
return AVERROR_EOF;
} else {
return AVERROR(EAGAIN);
}
}
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_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "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},
{ "framerate", "set frame rate", offsetof(AVFContext, framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "video_size", "set video size", offsetof(AVFContext, width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
{ "capture_cursor", "capture the screen cursor", offsetof(AVFContext, capture_cursor), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "capture_mouse_clicks", "capture the screen mouse clicks", offsetof(AVFContext, capture_mouse_clicks), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "capture_raw_data", "capture the raw data from device connection", offsetof(AVFContext, capture_raw_data), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "drop_late_frames", "drop frames that are available later than expected", offsetof(AVFContext, drop_late_frames), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass avf_class = {
.class_name = "AVFoundation indev",
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};
const 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,
};
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