libavdevice/qtkit.m - nest-android-app/ffmpeg - Git at Google

 /*
  * QTKit input device
  * Copyright (c) 2013 Vadim Kalinsky <vadim@kalinsky.ru>
  *
  * 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
  * QTKit input device
  * @author Vadim Kalinsky <vadim@kalinsky.ru>
  */

 #if defined(__clang__)
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 #endif

 #import <QTKit/QTKit.h>
 #include <pthread.h>

 #include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
 #include "libavformat/internal.h"
 #include "libavutil/internal.h"
 #include "libavutil/time.h"
 #include "avdevice.h"

 #define QTKIT_TIMEBASE 100

 static const AVRational kQTKitTimeBase_q = {
     .num = 1,
     .den = QTKIT_TIMEBASE
 };

 typedef struct
 {
     AVClass*        class;

     float           frame_rate;
     int             frames_captured;
     int64_t         first_pts;
     pthread_mutex_t frame_lock;
     pthread_cond_t  frame_wait_cond;
     id              qt_delegate;

     int             list_devices;
     int             video_device_index;

     QTCaptureSession*                 capture_session;
     QTCaptureDecompressedVideoOutput* video_output;
     CVImageBufferRef                  current_frame;
 } CaptureContext;

 static void lock_frames(CaptureContext* ctx)
 {
     pthread_mutex_lock(&ctx->frame_lock);
 }

 static void unlock_frames(CaptureContext* ctx)
 {
     pthread_mutex_unlock(&ctx->frame_lock);
 }

 /** FrameReciever class - delegate for QTCaptureSession
  */
 @interface FFMPEG_FrameReceiver : NSObject
 {
     CaptureContext* _context;
 }

 - (id)initWithContext:(CaptureContext*)context;

 - (void)captureOutput:(QTCaptureOutput *)captureOutput
   didOutputVideoFrame:(CVImageBufferRef)videoFrame
      withSampleBuffer:(QTSampleBuffer *)sampleBuffer
        fromConnection:(QTCaptureConnection *)connection;

 @end

 @implementation FFMPEG_FrameReceiver

 - (id)initWithContext:(CaptureContext*)context
 {
     if (self = [super init]) {
         _context = context;
     }
     return self;
 }

 - (void)captureOutput:(QTCaptureOutput *)captureOutput
   didOutputVideoFrame:(CVImageBufferRef)videoFrame
      withSampleBuffer:(QTSampleBuffer *)sampleBuffer
        fromConnection:(QTCaptureConnection *)connection
 {
     lock_frames(_context);
     if (_context->current_frame != nil) {
         CVBufferRelease(_context->current_frame);
     }

     _context->current_frame = CVBufferRetain(videoFrame);

     pthread_cond_signal(&_context->frame_wait_cond);

     unlock_frames(_context);

     ++_context->frames_captured;
 }

 @end

 static void destroy_context(CaptureContext* ctx)
 {
     [ctx->capture_session stopRunning];

     [ctx->capture_session release];
     [ctx->video_output    release];
     [ctx->qt_delegate     release];

     ctx->capture_session = NULL;
     ctx->video_output    = NULL;
     ctx->qt_delegate     = NULL;

     pthread_mutex_destroy(&ctx->frame_lock);
     pthread_cond_destroy(&ctx->frame_wait_cond);

     if (ctx->current_frame)
         CVBufferRelease(ctx->current_frame);
 }

 static int qtkit_read_header(AVFormatContext *s)
 {
     NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

     CaptureContext* ctx = (CaptureContext*)s->priv_data;

     ctx->first_pts = av_gettime();

     pthread_mutex_init(&ctx->frame_lock, NULL);
     pthread_cond_init(&ctx->frame_wait_cond, NULL);

     // List devices if requested
     if (ctx->list_devices) {
         av_log(ctx, AV_LOG_INFO, "QTKit video devices:\n");
         NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
         for (QTCaptureDevice *device in devices) {
             const char *name = [[device localizedDisplayName] UTF8String];
             int index  = [devices indexOfObject:device];
             av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
         }
         goto fail;
     }

     // Find capture device
     QTCaptureDevice *video_device = nil;

     // check for device index given in filename
     if (ctx->video_device_index == -1) {
         sscanf(s->filename, "%d", &ctx->video_device_index);
     }

     if (ctx->video_device_index >= 0) {
         NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];

         if (ctx->video_device_index >= [devices count]) {
             av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
             goto fail;
         }

         video_device = [devices objectAtIndex:ctx->video_device_index];
     } else if (strncmp(s->filename, "",        1) &&
                strncmp(s->filename, "default", 7)) {
         NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];

         for (QTCaptureDevice *device in devices) {
             if (!strncmp(s->filename, [[device localizedDisplayName] UTF8String], strlen(s->filename))) {
                 video_device = device;
                 break;
             }
         }
         if (!video_device) {
             av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
             goto fail;
         }
     } else {
         video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
     }

     BOOL success = [video_device open:nil];

     // Video capture device not found, looking for QTMediaTypeVideo
     if (!success) {
         video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
         success      = [video_device open:nil];

         if (!success) {
             av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
             goto fail;
         }
     }

     NSString* dev_display_name = [video_device localizedDisplayName];
     av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);

     // Initialize capture session
     ctx->capture_session = [[QTCaptureSession alloc] init];

     QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
     success = [ctx->capture_session addInput:capture_dev_input error:nil];

     if (!success) {
         av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
         goto fail;
     }

     // Attaching output
     // FIXME: Allow for a user defined pixel format
     ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];

     NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
                                        [NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
                                        forKey:(id)kCVPixelBufferPixelFormatTypeKey];

     [ctx->video_output setPixelBufferAttributes:captureDictionary];

     ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];

     [ctx->video_output setDelegate:ctx->qt_delegate];
     [ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
     [ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];

     success = [ctx->capture_session addOutput:ctx->video_output error:nil];

     if (!success) {
         av_log (s, AV_LOG_ERROR, "can't add video output to capture session\n");
         goto fail;
     }

     [ctx->capture_session startRunning];

     // 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) {
         goto fail;
     }

     avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE);

     stream->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
     stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
     stream->codec->width      = (int)CVPixelBufferGetWidth (ctx->current_frame);
     stream->codec->height     = (int)CVPixelBufferGetHeight(ctx->current_frame);
     stream->codec->pix_fmt    = AV_PIX_FMT_RGB24;

     CVBufferRelease(ctx->current_frame);
     ctx->current_frame = nil;

     unlock_frames(ctx);

     [pool release];

     return 0;

 fail:
     [pool release];

     destroy_context(ctx);

     return AVERROR(EIO);
 }

 static int qtkit_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     CaptureContext* ctx = (CaptureContext*)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, kQTKitTimeBase_q);
             pkt->stream_index = 0;
             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);
             CVBufferRelease(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 qtkit_close(AVFormatContext *s)
 {
     CaptureContext* ctx = (CaptureContext*)s->priv_data;

     destroy_context(ctx);

     return 0;
 }

 static const AVOption options[] = {
     { "frame_rate", "set frame rate", offsetof(CaptureContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
     { "list_devices", "list available devices", offsetof(CaptureContext, 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(CaptureContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
     { NULL },
 };

 static const AVClass qtkit_class = {
     .class_name = "QTKit input device",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
 };

 AVInputFormat ff_qtkit_demuxer = {
     .name           = "qtkit",
     .long_name      = NULL_IF_CONFIG_SMALL("QTKit input device"),
     .priv_data_size = sizeof(CaptureContext),
     .read_header    = qtkit_read_header,
     .read_packet    = qtkit_read_packet,
     .read_close     = qtkit_close,
     .flags          = AVFMT_NOFILE,
     .priv_class     = &qtkit_class,
 };
	/*
	* QTKit input device
	* Copyright (c) 2013 Vadim Kalinsky <vadim@kalinsky.ru>
	*
	* 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
	* QTKit input device
	* @author Vadim Kalinsky <vadim@kalinsky.ru>
	*/

	#if defined(__clang__)
	#pragma clang diagnostic ignored "-Wdeprecated-declarations"
	#endif

	#import <QTKit/QTKit.h>
	#include <pthread.h>

	#include "libavutil/pixdesc.h"
	#include "libavutil/opt.h"
	#include "libavformat/internal.h"
	#include "libavutil/internal.h"
	#include "libavutil/time.h"
	#include "avdevice.h"

	#define QTKIT_TIMEBASE 100

	static const AVRational kQTKitTimeBase_q = {
	.num = 1,
	.den = QTKIT_TIMEBASE
	};

	typedef struct
	{
	AVClass* class;

	float frame_rate;
	int frames_captured;
	int64_t first_pts;
	pthread_mutex_t frame_lock;
	pthread_cond_t frame_wait_cond;
	id qt_delegate;

	int list_devices;
	int video_device_index;

	QTCaptureSession* capture_session;
	QTCaptureDecompressedVideoOutput* video_output;
	CVImageBufferRef current_frame;
	} CaptureContext;

	static void lock_frames(CaptureContext* ctx)
	{
	pthread_mutex_lock(&ctx->frame_lock);
	}

	static void unlock_frames(CaptureContext* ctx)
	{
	pthread_mutex_unlock(&ctx->frame_lock);
	}

	/** FrameReciever class - delegate for QTCaptureSession
	*/
	@interface FFMPEG_FrameReceiver : NSObject
	{
	CaptureContext* _context;
	}

	- (id)initWithContext:(CaptureContext*)context;

	- (void)captureOutput:(QTCaptureOutput *)captureOutput
	didOutputVideoFrame:(CVImageBufferRef)videoFrame
	withSampleBuffer:(QTSampleBuffer *)sampleBuffer
	fromConnection:(QTCaptureConnection *)connection;

	@end

	@implementation FFMPEG_FrameReceiver

	- (id)initWithContext:(CaptureContext*)context
	{
	if (self = [super init]) {
	_context = context;
	}
	return self;
	}

	- (void)captureOutput:(QTCaptureOutput *)captureOutput
	didOutputVideoFrame:(CVImageBufferRef)videoFrame
	withSampleBuffer:(QTSampleBuffer *)sampleBuffer
	fromConnection:(QTCaptureConnection *)connection
	{
	lock_frames(_context);
	if (_context->current_frame != nil) {
	CVBufferRelease(_context->current_frame);
	}

	_context->current_frame = CVBufferRetain(videoFrame);

	pthread_cond_signal(&_context->frame_wait_cond);

	unlock_frames(_context);

	++_context->frames_captured;
	}

	@end

	static void destroy_context(CaptureContext* ctx)
	{
	[ctx->capture_session stopRunning];

	[ctx->capture_session release];
	[ctx->video_output release];
	[ctx->qt_delegate release];

	ctx->capture_session = NULL;
	ctx->video_output = NULL;
	ctx->qt_delegate = NULL;

	pthread_mutex_destroy(&ctx->frame_lock);
	pthread_cond_destroy(&ctx->frame_wait_cond);

	if (ctx->current_frame)
	CVBufferRelease(ctx->current_frame);
	}

	static int qtkit_read_header(AVFormatContext *s)
	{
	NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

	CaptureContext* ctx = (CaptureContext*)s->priv_data;

	ctx->first_pts = av_gettime();

	pthread_mutex_init(&ctx->frame_lock, NULL);
	pthread_cond_init(&ctx->frame_wait_cond, NULL);

	// List devices if requested
	if (ctx->list_devices) {
	av_log(ctx, AV_LOG_INFO, "QTKit video devices:\n");
	NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
	for (QTCaptureDevice *device in devices) {
	const char *name = [[device localizedDisplayName] UTF8String];
	int index = [devices indexOfObject:device];
	av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
	}
	goto fail;
	}

	// Find capture device
	QTCaptureDevice *video_device = nil;

	// check for device index given in filename
	if (ctx->video_device_index == -1) {
	sscanf(s->filename, "%d", &ctx->video_device_index);
	}

	if (ctx->video_device_index >= 0) {
	NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];

	if (ctx->video_device_index >= [devices count]) {
	av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
	goto fail;
	}

	video_device = [devices objectAtIndex:ctx->video_device_index];
	} else if (strncmp(s->filename, "", 1) &&
	strncmp(s->filename, "default", 7)) {
	NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];

	for (QTCaptureDevice *device in devices) {
	if (!strncmp(s->filename, [[device localizedDisplayName] UTF8String], strlen(s->filename))) {
	video_device = device;
	break;
	}
	}
	if (!video_device) {
	av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
	goto fail;
	}
	} else {
	video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
	}

	BOOL success = [video_device open:nil];

	// Video capture device not found, looking for QTMediaTypeVideo
	if (!success) {
	video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
	success = [video_device open:nil];

	if (!success) {
	av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
	goto fail;
	}
	}

	NSString* dev_display_name = [video_device localizedDisplayName];
	av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);

	// Initialize capture session
	ctx->capture_session = [[QTCaptureSession alloc] init];

	QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
	success = [ctx->capture_session addInput:capture_dev_input error:nil];

	if (!success) {
	av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
	goto fail;
	}

	// Attaching output
	// FIXME: Allow for a user defined pixel format
	ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];

	NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
	[NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
	forKey:(id)kCVPixelBufferPixelFormatTypeKey];

	[ctx->video_output setPixelBufferAttributes:captureDictionary];

	ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];

	[ctx->video_output setDelegate:ctx->qt_delegate];
	[ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
	[ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];

	success = [ctx->capture_session addOutput:ctx->video_output error:nil];

	if (!success) {
	av_log (s, AV_LOG_ERROR, "can't add video output to capture session\n");
	goto fail;
	}

	[ctx->capture_session startRunning];

	// 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) {
	goto fail;
	}

	avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE);

	stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
	stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	stream->codec->width = (int)CVPixelBufferGetWidth (ctx->current_frame);
	stream->codec->height = (int)CVPixelBufferGetHeight(ctx->current_frame);
	stream->codec->pix_fmt = AV_PIX_FMT_RGB24;

	CVBufferRelease(ctx->current_frame);
	ctx->current_frame = nil;

	unlock_frames(ctx);

	[pool release];

	return 0;

	fail:
	[pool release];

	destroy_context(ctx);

	return AVERROR(EIO);
	}

	static int qtkit_read_packet(AVFormatContext s, AVPacket pkt)
	{
	CaptureContext* ctx = (CaptureContext*)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, kQTKitTimeBase_q);
	pkt->stream_index = 0;
	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);
	CVBufferRelease(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 qtkit_close(AVFormatContext *s)
	{
	CaptureContext* ctx = (CaptureContext*)s->priv_data;

	destroy_context(ctx);

	return 0;
	}

	static const AVOption options[] = {
	{ "frame_rate", "set frame rate", offsetof(CaptureContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
	{ "list_devices", "list available devices", offsetof(CaptureContext, 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(CaptureContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
	{ NULL },
	};

	static const AVClass qtkit_class = {
	.class_name = "QTKit input device",
	.item_name = av_default_item_name,
	.option = options,
	.version = LIBAVUTIL_VERSION_INT,
	.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
	};

	AVInputFormat ff_qtkit_demuxer = {
	.name = "qtkit",
	.long_name = NULL_IF_CONFIG_SMALL("QTKit input device"),
	.priv_data_size = sizeof(CaptureContext),
	.read_header = qtkit_read_header,
	.read_packet = qtkit_read_packet,
	.read_close = qtkit_close,
	.flags = AVFMT_NOFILE,
	.priv_class = &qtkit_class,
	};