/*
* 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>
*/
#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,
};