359 lines
11 KiB
Objective-C
359 lines
11 KiB
Objective-C
/*
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* QTKit input device
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* Copyright (c) 2013 Vadim Kalinsky <vadim@kalinsky.ru>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* QTKit input device
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* @author Vadim Kalinsky <vadim@kalinsky.ru>
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*/
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#import <QTKit/QTkit.h>
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#include <pthread.h>
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "libavformat/internal.h"
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#include "libavutil/internal.h"
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#include "libavutil/time.h"
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#include "avdevice.h"
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#define QTKIT_TIMEBASE 100
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static const AVRational kQTKitTimeBase_q = {
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.num = 1,
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.den = QTKIT_TIMEBASE
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};
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typedef struct
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{
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AVClass* class;
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float frame_rate;
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int frames_captured;
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int64_t first_pts;
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pthread_mutex_t frame_lock;
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pthread_cond_t frame_wait_cond;
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id qt_delegate;
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int list_devices;
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int video_device_index;
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QTCaptureSession* capture_session;
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QTCaptureDecompressedVideoOutput* video_output;
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CVImageBufferRef current_frame;
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} CaptureContext;
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static void lock_frames(CaptureContext* ctx)
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{
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pthread_mutex_lock(&ctx->frame_lock);
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}
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static void unlock_frames(CaptureContext* ctx)
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{
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pthread_mutex_unlock(&ctx->frame_lock);
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}
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/** FrameReciever class - delegate for QTCaptureSession
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*/
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@interface FFMPEG_FrameReceiver : NSObject
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{
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CaptureContext* _context;
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}
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- (id)initWithContext:(CaptureContext*)context;
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- (void)captureOutput:(QTCaptureOutput *)captureOutput
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didOutputVideoFrame:(CVImageBufferRef)videoFrame
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withSampleBuffer:(QTSampleBuffer *)sampleBuffer
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fromConnection:(QTCaptureConnection *)connection;
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@end
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@implementation FFMPEG_FrameReceiver
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- (id)initWithContext:(CaptureContext*)context
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{
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if (self = [super init]) {
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_context = context;
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}
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return self;
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}
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- (void)captureOutput:(QTCaptureOutput *)captureOutput
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didOutputVideoFrame:(CVImageBufferRef)videoFrame
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withSampleBuffer:(QTSampleBuffer *)sampleBuffer
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fromConnection:(QTCaptureConnection *)connection
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{
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lock_frames(_context);
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if (_context->current_frame != nil) {
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CVBufferRelease(_context->current_frame);
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}
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_context->current_frame = CVBufferRetain(videoFrame);
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pthread_cond_signal(&_context->frame_wait_cond);
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unlock_frames(_context);
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++_context->frames_captured;
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}
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@end
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static void destroy_context(CaptureContext* ctx)
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{
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[ctx->capture_session stopRunning];
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[ctx->capture_session release];
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[ctx->video_output release];
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[ctx->qt_delegate release];
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ctx->capture_session = NULL;
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ctx->video_output = NULL;
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ctx->qt_delegate = NULL;
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pthread_mutex_destroy(&ctx->frame_lock);
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pthread_cond_destroy(&ctx->frame_wait_cond);
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if (ctx->current_frame)
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CVBufferRelease(ctx->current_frame);
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}
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static int qtkit_read_header(AVFormatContext *s)
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{
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NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
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CaptureContext* ctx = (CaptureContext*)s->priv_data;
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ctx->first_pts = av_gettime();
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pthread_mutex_init(&ctx->frame_lock, NULL);
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pthread_cond_init(&ctx->frame_wait_cond, NULL);
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// List devices if requested
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if (ctx->list_devices) {
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av_log(ctx, AV_LOG_INFO, "QTKit video devices:\n");
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NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
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for (QTCaptureDevice *device in devices) {
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const char *name = [[device localizedDisplayName] UTF8String];
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int index = [devices indexOfObject:device];
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av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
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}
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goto fail;
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}
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// Find capture device
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QTCaptureDevice *video_device = nil;
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// check for device index given in filename
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if (ctx->video_device_index == -1) {
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sscanf(s->filename, "%d", &ctx->video_device_index);
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}
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if (ctx->video_device_index >= 0) {
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NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
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if (ctx->video_device_index >= [devices count]) {
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av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
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goto fail;
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}
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video_device = [devices objectAtIndex:ctx->video_device_index];
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} else if (strncmp(s->filename, "", 1) &&
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strncmp(s->filename, "default", 7)) {
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NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
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for (QTCaptureDevice *device in devices) {
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if (!strncmp(s->filename, [[device localizedDisplayName] UTF8String], strlen(s->filename))) {
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video_device = device;
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break;
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}
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}
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if (!video_device) {
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av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
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goto fail;
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}
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} else {
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video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
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}
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BOOL success = [video_device open:nil];
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// Video capture device not found, looking for QTMediaTypeVideo
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if (!success) {
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video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
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success = [video_device open:nil];
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if (!success) {
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av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
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goto fail;
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}
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}
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NSString* dev_display_name = [video_device localizedDisplayName];
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av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);
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// Initialize capture session
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ctx->capture_session = [[QTCaptureSession alloc] init];
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QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
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success = [ctx->capture_session addInput:capture_dev_input error:nil];
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if (!success) {
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av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
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goto fail;
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}
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// Attaching output
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// FIXME: Allow for a user defined pixel format
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ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];
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NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
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[NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
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forKey:(id)kCVPixelBufferPixelFormatTypeKey];
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[ctx->video_output setPixelBufferAttributes:captureDictionary];
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ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];
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[ctx->video_output setDelegate:ctx->qt_delegate];
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[ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
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[ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];
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success = [ctx->capture_session addOutput:ctx->video_output error:nil];
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if (!success) {
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av_log (s, AV_LOG_ERROR, "can't add video output to capture session\n");
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goto fail;
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}
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[ctx->capture_session startRunning];
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// Take stream info from the first frame.
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while (ctx->frames_captured < 1) {
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CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
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}
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lock_frames(ctx);
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AVStream* stream = avformat_new_stream(s, NULL);
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if (!stream) {
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goto fail;
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}
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avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE);
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stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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stream->codec->width = (int)CVPixelBufferGetWidth (ctx->current_frame);
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stream->codec->height = (int)CVPixelBufferGetHeight(ctx->current_frame);
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stream->codec->pix_fmt = AV_PIX_FMT_RGB24;
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CVBufferRelease(ctx->current_frame);
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ctx->current_frame = nil;
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unlock_frames(ctx);
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[pool release];
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return 0;
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fail:
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[pool release];
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destroy_context(ctx);
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return AVERROR(EIO);
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}
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static int qtkit_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CaptureContext* ctx = (CaptureContext*)s->priv_data;
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do {
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lock_frames(ctx);
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if (ctx->current_frame != nil) {
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if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(ctx->current_frame)) < 0) {
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return AVERROR(EIO);
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}
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pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts, AV_TIME_BASE_Q, kQTKitTimeBase_q);
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pkt->stream_index = 0;
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pkt->flags |= AV_PKT_FLAG_KEY;
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CVPixelBufferLockBaseAddress(ctx->current_frame, 0);
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void* data = CVPixelBufferGetBaseAddress(ctx->current_frame);
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memcpy(pkt->data, data, pkt->size);
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CVPixelBufferUnlockBaseAddress(ctx->current_frame, 0);
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CVBufferRelease(ctx->current_frame);
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ctx->current_frame = nil;
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} else {
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pkt->data = NULL;
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pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
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}
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unlock_frames(ctx);
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} while (!pkt->data);
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return 0;
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}
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static int qtkit_close(AVFormatContext *s)
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{
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CaptureContext* ctx = (CaptureContext*)s->priv_data;
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destroy_context(ctx);
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return 0;
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}
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static const AVOption options[] = {
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{ "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 },
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{ "list_devices", "list available devices", offsetof(CaptureContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "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 },
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{ NULL },
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};
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static const AVClass qtkit_class = {
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.class_name = "QTKit input device",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
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};
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AVInputFormat ff_qtkit_demuxer = {
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.name = "qtkit",
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.long_name = NULL_IF_CONFIG_SMALL("QTKit input device"),
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.priv_data_size = sizeof(CaptureContext),
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.read_header = qtkit_read_header,
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.read_packet = qtkit_read_packet,
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.read_close = qtkit_close,
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.flags = AVFMT_NOFILE,
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.priv_class = &qtkit_class,
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};
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