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ffmpeg/libavdevice/avfoundation.m

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/*
* AVFoundation input device
* Copyright (c) 2015 Luca Barbato
* Alexandre Lision
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#import <AVFoundation/AVFoundation.h>
#include <pthread.h>
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time.h"
#include "avdevice.h"
struct AVPixelFormatMap {
enum AVPixelFormat pix_fmt;
OSType core_video_fmt;
};
static const struct AVPixelFormatMap pixel_format_map[] = {
{ AV_PIX_FMT_ABGR, kCVPixelFormatType_32ABGR },
{ AV_PIX_FMT_ARGB, kCVPixelFormatType_32ARGB },
{ AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR },
{ AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB },
{ AV_PIX_FMT_BGRA, kCVPixelFormatType_32BGRA },
{ AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome },
{ AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
{ AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB },
{ 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_RGBA, kCVPixelFormatType_32RGBA },
{ AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 },
{ AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar },
{ AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 },
{ AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 },
{ AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 },
{ AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 },
{ AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R },
{ AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
{ 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 }
};
static enum AVPixelFormat core_video_to_pix_fmt(OSType core_video_fmt)
{
int i;
for (i = 0; pixel_format_map[i].pix_fmt != AV_PIX_FMT_NONE; i++)
if (core_video_fmt == pixel_format_map[i].core_video_fmt)
return pixel_format_map[i].pix_fmt;
return AV_PIX_FMT_NONE;
}
static OSType pix_fmt_to_core_video(enum AVPixelFormat pix_fmt)
{
int i;
for (i = 0; pixel_format_map[i].pix_fmt != AV_PIX_FMT_NONE; i++)
if (pix_fmt == pixel_format_map[i].pix_fmt)
return pixel_format_map[i].core_video_fmt;
return 0;
}
typedef struct AVFoundationCaptureContext {
AVClass *class;
/* AVOptions */
int list_devices;
int list_formats;
char *pixel_format;
char *video_size; /* String describing video size */
char *framerate; /* String describing the framerate */
int video_stream_index;
int width, height;
AVRational internal_framerate;
int64_t first_pts;
int frames_captured;
pthread_mutex_t frame_lock;
pthread_cond_t frame_wait_cond;
/* ARC-compatible pointers to ObjC objects */
CFTypeRef session; /* AVCaptureSession */
CFTypeRef video_output;
CFTypeRef video_delegate;
CVImageBufferRef current_frame;
} AVFoundationCaptureContext;
#define AUDIO_DEVICES 1
#define VIDEO_DEVICES 2
#define ALL_DEVICES AUDIO_DEVICES | VIDEO_DEVICES
#define OFFSET(x) offsetof(AVFoundationCaptureContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "list_devices", "List available devices and exit", OFFSET(list_devices), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC, "list_devices" },
{ "all", "Show all the supported devices", OFFSET(list_devices), AV_OPT_TYPE_CONST, { .i64 = ALL_DEVICES }, 0, INT_MAX, DEC, "list_devices" },
{ "audio", "Show only the audio devices", OFFSET(list_devices), AV_OPT_TYPE_CONST, { .i64 = AUDIO_DEVICES }, 0, INT_MAX, DEC, "list_devices" },
{ "video", "Show only the video devices", OFFSET(list_devices), AV_OPT_TYPE_CONST, { .i64 = VIDEO_DEVICES }, 0, INT_MAX, DEC, "list_devices" },
{ "list_formats", "List available formats and exit", OFFSET(list_formats), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
{ "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
{ "framerate", "A string representing desired framerate", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
{ NULL },
};
static void list_capture_devices_by_type(AVFormatContext *s, NSString *type)
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:type];
av_log(s, AV_LOG_INFO, "Type: %s\n", [type UTF8String]);
for (AVCaptureDevice *device in devices) {
av_log(s, AV_LOG_INFO, "uniqueID: %s\nname: %s\nformat:\n",
[[device uniqueID] UTF8String],
[[device localizedName] UTF8String]);
for (AVCaptureDeviceFormat *format in device.formats)
av_log(s, AV_LOG_INFO, "\t%s\n",
[[NSString stringWithFormat: @ "%@", format] UTF8String]);
}
}
static int avfoundation_list_capture_devices(AVFormatContext *s)
{
AVFoundationCaptureContext *ctx = s->priv_data;
if (ctx->list_devices & AUDIO_DEVICES)
list_capture_devices_by_type(s, AVMediaTypeAudio);
if (ctx->list_devices & VIDEO_DEVICES)
list_capture_devices_by_type(s, AVMediaTypeVideo);
return AVERROR_EXIT;
}
static int list_formats(AVFormatContext *s)
{
av_log(s, AV_LOG_VERBOSE, "Supported pixel formats (first is more efficient):\n");
AVCaptureVideoDataOutput *out = [[AVCaptureVideoDataOutput alloc] init];
for (NSNumber *cv_pixel_format in[out availableVideoCVPixelFormatTypes]) {
OSType cv_fmt = [cv_pixel_format intValue];
enum AVPixelFormat pix_fmt = core_video_to_pix_fmt(cv_fmt);
if (pix_fmt != AV_PIX_FMT_NONE) {
av_log(s, AV_LOG_VERBOSE, " %s: %d\n",
av_get_pix_fmt_name(pix_fmt),
cv_fmt);
}
}
return AVERROR_EXIT;
}
static void lock_frames(AVFoundationCaptureContext *ctx)
{
pthread_mutex_lock(&ctx->frame_lock);
}
static void unlock_frames(AVFoundationCaptureContext *ctx)
{
pthread_mutex_unlock(&ctx->frame_lock);
}
@interface VideoCapture : NSObject <AVCaptureVideoDataOutputSampleBufferDelegate>
{
AVFoundationCaptureContext *_context;
}
- (id)initWithContext:(AVFoundationCaptureContext *)context;
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
fromConnection:(AVCaptureConnection *)connection;
@end
@implementation VideoCapture
- (id)initWithContext:(AVFoundationCaptureContext *)context
{
if (self = [super init]) {
_context = context;
}
return self;
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
fromConnection:(AVCaptureConnection *)connection
{
CVImageBufferRef buf;
lock_frames(_context);
if (_context->current_frame != nil) {
CFRelease(_context->current_frame);
}
buf = CMSampleBufferGetImageBuffer(videoFrame);
if (!buf)
return;
CFRetain(buf);
_context->current_frame = buf;
pthread_cond_signal(&_context->frame_wait_cond);
unlock_frames(_context);
++_context->frames_captured;
}
@end
/**
* Configure the video device.
*/
static bool configure_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
{
AVFoundationCaptureContext *ctx = s->priv_data;
AVCaptureDeviceFormat *selected_format = nil;
AVFrameRateRange *selected_range = nil;
double framerate = av_q2d(ctx->internal_framerate);
double epsilon = 0.00000001;
for (AVCaptureDeviceFormat *format in[video_device formats]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef)format.formatDescription;
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
if ((ctx->width == 0 && ctx->height == 0) ||
(dimensions.width == ctx->width && dimensions.height == ctx->height)) {
av_log(s, AV_LOG_VERBOSE, "Trying video size %dx%d\n",
dimensions.width, dimensions.height);
ctx->width = dimensions.width;
ctx->height = dimensions.height;
selected_format = format;
if (framerate) {
av_log(s, AV_LOG_VERBOSE, "Checking support for framerate %f\n",
framerate);
for (AVFrameRateRange *range in format.videoSupportedFrameRateRanges)
if (range.minFrameRate <= (framerate + epsilon) &&
range.maxFrameRate >= (framerate - epsilon)) {
selected_range = range;
break;
}
} else {
selected_range = format.videoSupportedFrameRateRanges[0];
framerate = selected_range.maxFrameRate;
break;
}
if (selected_format && selected_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);
return false;
} else {
av_log(s, AV_LOG_VERBOSE, "Setting video size to %dx%d\n",
ctx->width, ctx->height);
}
if (framerate && !selected_range) {
av_log(s, AV_LOG_ERROR, "Selected framerate (%f) is not supported by the device\n",
framerate);
return false;
} else {
av_log(s, AV_LOG_VERBOSE, "Setting framerate to %f\n",
framerate);
}
if ([video_device lockForConfiguration : NULL] == YES) {
[video_device setActiveFormat : selected_format];
[video_device setActiveVideoMinFrameDuration : CMTimeMake(1, framerate)];
[video_device setActiveVideoMaxFrameDuration : CMTimeMake(1, framerate)];
} else {
av_log(s, AV_LOG_ERROR, "Could not lock device for configuration\n");
return false;
}
return true;
}
static void print_supported_formats(AVFormatContext *s, AVCaptureDevice *device)
{
av_log(s, AV_LOG_WARNING, "Supported modes:\n");
for (AVCaptureDeviceFormat *format in[device formats]) {
CMFormatDescriptionRef formatDescription;
CMVideoDimensions dimensions;
formatDescription = (CMFormatDescriptionRef)format.formatDescription;
dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
for (AVFrameRateRange *range in format.videoSupportedFrameRateRanges)
av_log(s, AV_LOG_WARNING, " %dx%d@[%f %f]fps\n",
dimensions.width, dimensions.height,
range.minFrameRate, range.maxFrameRate);
}
}
static int setup_stream(AVFormatContext *s, AVCaptureDevice *device)
{
AVFoundationCaptureContext *ctx = s->priv_data;
NSError *__autoreleasing error = nil;
AVCaptureDeviceInput *input;
AVCaptureSession *session = (__bridge AVCaptureSession *)ctx->session;
av_log(s, AV_LOG_VERBOSE, "Setting up stream for device %s\n", [[device uniqueID] UTF8String]);
if (!configure_video_device(s, device)) {
av_log(s, AV_LOG_ERROR, "device configuration failed\n");
print_supported_formats(s, device);
return AVERROR(EINVAL);
}
// add the input devices
input = [AVCaptureDeviceInput deviceInputWithDevice:device
error:&error];
if (!input) {
av_log(s, AV_LOG_ERROR, "%s\n",
[[error localizedDescription] UTF8String]);
return AVERROR_UNKNOWN;
}
if ([session canAddInput : input]) {
[session addInput : input];
} else {
av_log(s, AV_LOG_ERROR, "Cannot add video input to capture session\n");
return AVERROR(EINVAL);
}
// add the output devices
if ([device hasMediaType : AVMediaTypeVideo]) {
AVCaptureVideoDataOutput *out = [[AVCaptureVideoDataOutput alloc] init];
NSNumber *core_video_fmt = nil;
if (!out) {
av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
return AVERROR(EINVAL);
}
[out setAlwaysDiscardsLateVideoFrames : YES];
if (ctx->pixel_format) {
// Try to use specified pixel format
core_video_fmt = [NSNumber numberWithInt:pix_fmt_to_core_video(av_get_pix_fmt(ctx->pixel_format))];
if ([[out availableVideoCVPixelFormatTypes] indexOfObject : core_video_fmt] != NSNotFound) {
av_log(s, AV_LOG_VERBOSE, "Pixel format %s supported!\n", ctx->pixel_format);
} else {
core_video_fmt = nil;
}
}
if (!ctx->pixel_format || !core_video_fmt) {
av_log(s, AV_LOG_VERBOSE, "Pixel format not supported or not provided, overriding...\n");
for (NSNumber *cv_pixel_format in[out availableVideoCVPixelFormatTypes]) {
OSType cv_fmt = [cv_pixel_format intValue];
enum AVPixelFormat pix_fmt = core_video_to_pix_fmt(cv_fmt);
// Use the first one in the list, it will be the most effective
if (pix_fmt != AV_PIX_FMT_NONE) {
core_video_fmt = cv_pixel_format;
ctx->pixel_format = av_strdup(av_get_pix_fmt_name(pix_fmt));
break;
}
}
}
// fail if there is no appropriate pixel format
if (!core_video_fmt) {
return AVERROR(EINVAL);
} else {
av_log(s, AV_LOG_VERBOSE, "Using %s.\n",
ctx->pixel_format);
}
NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:core_video_fmt
forKey:(const NSString *)kCVPixelBufferPixelFormatTypeKey];
[out setVideoSettings : capture_dict];
VideoCapture *delegate = [[VideoCapture alloc] initWithContext:ctx];
dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
[out setSampleBufferDelegate : delegate queue : queue];
if ([session canAddOutput : out]) {
[session addOutput : out];
ctx->video_output = (__bridge_retained CFTypeRef)out;
ctx->video_delegate = (__bridge_retained CFTypeRef)delegate;
} else {
av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
return AVERROR(EINVAL);
}
}
return 0;
}
static int get_video_config(AVFormatContext *s)
{
AVFoundationCaptureContext *ctx = (AVFoundationCaptureContext *)s->priv_data;
CVImageBufferRef image_buffer;
CGSize image_buffer_size;
AVStream *stream = avformat_new_stream(s, NULL);
if (!stream) {
av_log(s, AV_LOG_ERROR, "Failed to create AVStream\n");
return AVERROR(EINVAL);
}
// 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, 1000000);
image_buffer = ctx->current_frame;
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 = av_get_pix_fmt(ctx->pixel_format);
CFRelease(ctx->current_frame);
ctx->current_frame = nil;
unlock_frames(ctx);
return 0;
}
static void destroy_context(AVFoundationCaptureContext *ctx)
{
AVCaptureSession *session = (__bridge AVCaptureSession *)ctx->session;
[session stopRunning];
ctx->session = NULL;
pthread_mutex_destroy(&ctx->frame_lock);
pthread_cond_destroy(&ctx->frame_wait_cond);
if (ctx->current_frame) {
CFRelease(ctx->current_frame);
}
}
static int setup_default_stream(AVFormatContext *s)
{
AVCaptureDevice *device;
for (NSString *type in @[AVMediaTypeVideo]) {
device = [AVCaptureDevice defaultDeviceWithMediaType:type];
if (device) {
av_log(s, AV_LOG_VERBOSE, "Using default device %s\n",
[[device uniqueID] UTF8String]);
return setup_stream(s, device);
}
}
return AVERROR(EINVAL);
}
/**
* Try to open device given in filename
* Two supported formats: "device_unique_id" or "[device_unique_id]"
*/
static AVCaptureDevice *create_device(AVFormatContext *s)
{
NSString *filename;
NSError *__autoreleasing error = nil;
NSRegularExpression *exp;
NSArray *matches;
AVCaptureDevice *device;
filename = [NSString stringWithFormat:@ "%s", s->filename];
if ((device = [AVCaptureDevice deviceWithUniqueID:filename])) {
av_log(s, AV_LOG_VERBOSE, "Device with name %s found\n", [filename UTF8String]);
return device;
}
// Remove '[]' from the device name
NSString *pat = @"(?<=\\[).*?(?=\\])";
exp = [NSRegularExpression regularExpressionWithPattern:pat
options:0
error:&error];
if (!exp) {
av_log(s, AV_LOG_ERROR, "%s\n",
[[error localizedDescription] UTF8String]);
return NULL;
}
matches = [exp matchesInString:filename options:0
range:NSMakeRange(0, [filename length])];
if (matches.count > 0) {
for (NSTextCheckingResult *match in matches) {
NSRange range = [match rangeAtIndex:0];
NSString *uniqueID = [filename substringWithRange:NSMakeRange(range.location, range.length)];
av_log(s, AV_LOG_VERBOSE, "opening device with ID: %s\n", [uniqueID UTF8String]);
if (!(device = [AVCaptureDevice deviceWithUniqueID:uniqueID])) {
av_log(s, AV_LOG_ERROR, "Device with name %s not found", [filename UTF8String]);
return NULL;
}
return device;
}
}
return NULL;
}
static int setup_streams(AVFormatContext *s)
{
AVFoundationCaptureContext *ctx = s->priv_data;
int ret;
AVCaptureDevice *device;
pthread_mutex_init(&ctx->frame_lock, NULL);
pthread_cond_init(&ctx->frame_wait_cond, NULL);
ctx->session = (__bridge_retained CFTypeRef)[[AVCaptureSession alloc] init];
if (!strncmp(s->filename, "default", 7)) {
ret = setup_default_stream(s);
} else {
device = create_device(s);
if (device) {
ret = setup_stream(s, device);
} else {
av_log(s, AV_LOG_ERROR, "No matches for %s\n", s->filename);
ret = setup_default_stream(s);
}
}
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "No device could be added\n");
return ret;
}
av_log(s, AV_LOG_VERBOSE, "Starting session!\n");
[(__bridge AVCaptureSession *)ctx->session startRunning];
// Session is started, unlock device
[device unlockForConfiguration];
av_log(s, AV_LOG_VERBOSE, "Checking video config\n");
if (get_video_config(s)) {
destroy_context(ctx);
return AVERROR(EIO);
}
return 0;
}
static int avfoundation_read_header(AVFormatContext *s)
{
AVFoundationCaptureContext *ctx = s->priv_data;
ctx->first_pts = av_gettime();
AVRational framerate_q = { 0, 1 };
ctx->internal_framerate = framerate_q;
if (ctx->list_devices)
return avfoundation_list_capture_devices(s);
if (ctx->list_formats) {
return list_formats(s);
}
if (ctx->pixel_format) {
if (av_get_pix_fmt(ctx->pixel_format) == AV_PIX_FMT_NONE) {
av_log(s, AV_LOG_ERROR, "No such input format: %s.\n",
ctx->pixel_format);
return AVERROR(EINVAL);
}
}
if (ctx->video_size &&
(av_parse_video_size(&ctx->width, &ctx->height, ctx->video_size)) < 0) {
av_log(s, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
ctx->video_size);
return AVERROR(EINVAL);
}
if (ctx->framerate &&
(av_parse_video_rate(&ctx->internal_framerate, ctx->framerate)) < 0) {
av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
ctx->framerate);
return AVERROR(EINVAL);
}
return setup_streams(s);
}
static int avfoundation_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVFoundationCaptureContext *ctx = (AVFoundationCaptureContext *)s->priv_data;
do {
lock_frames(ctx);
if (ctx->current_frame != nil) {
if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(ctx->current_frame)) < 0) {
return AVERROR(EIO);
}
pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts,
AV_TIME_BASE_Q,
(AVRational) {1, 1000000 });
pkt->stream_index = ctx->video_stream_index;
pkt->flags |= AV_PKT_FLAG_KEY;
CVPixelBufferLockBaseAddress(ctx->current_frame, 0);
void *data = CVPixelBufferGetBaseAddress(ctx->current_frame);
memcpy(pkt->data, data, pkt->size);
CVPixelBufferUnlockBaseAddress(ctx->current_frame, 0);
CFRelease(ctx->current_frame);
ctx->current_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 avfoundation_read_close(AVFormatContext *s)
{
av_log(s, AV_LOG_VERBOSE, "Closing session...\n");
AVFoundationCaptureContext *ctx = s->priv_data;
destroy_context(ctx);
return 0;
}
static const AVClass avfoundation_class = {
.class_name = "AVFoundation AVCaptureDevice indev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_avfoundation_demuxer = {
.name = "avfoundation",
.long_name = NULL_IF_CONFIG_SMALL("AVFoundation AVCaptureDevice grab"),
.priv_data_size = sizeof(AVFoundationCaptureContext),
.read_header = avfoundation_read_header,
.read_packet = avfoundation_read_packet,
.read_close = avfoundation_read_close,
.flags = AVFMT_NOFILE,
.priv_class = &avfoundation_class,
};
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