363 lines
11 KiB
Objective-C
363 lines
11 KiB
Objective-C
/*
|
|
* 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,
|
|
};
|