C++ Timestamp::msecs方法代码示例

bool VideoDecoder::seek(const Audio::Timestamp &time) {
	if (!isSeekable())
		return false;

	// Stop all tracks so they can be seeked
	if (isPlaying())
		stopAudio();

	// Do the actual seeking
	if (!seekIntern(time))
		return false;

	// Seek any external track too
	for (TrackListIterator it = _externalTracks.begin(); it != _externalTracks.end(); it++)
		if (!(*it)->seek(time))
			return false;

	_lastTimeChange = time;

	// Now that we've seeked, start all tracks again
	// Also reset our start time
	if (isPlaying()) {
		startAudio();
		_startTime = g_system->getMillis() - (time.msecs() / _playbackRate).toInt();
	}

	resetPauseStartTime();
	findNextVideoTrack();
	_needsUpdate = true;
	return true;
}

bool VideoDecoder::seek(const Audio::Timestamp &time) {
	if (!isSeekable())
		return false;

	// Stop all tracks so they can be seeked
	if (isPlaying())
		stopAudio();

	for (TrackList::iterator it = _tracks.begin(); it != _tracks.end(); it++)
		if (!(*it)->seek(time))
			return false;

	_lastTimeChange = time;

	// Now that we've seeked, start all tracks again
	// Also reset our start time
	if (isPlaying()) {
		startAudio();
		_startTime = g_system->getMillis() - time.msecs();
	}

	resetPauseStartTime();
	_needsUpdate = true;
	return true;
}

void VideoDecoder::setEndTime(const Audio::Timestamp &endTime) {
	Audio::Timestamp startTime = 0;

	if (isPlaying()) {
		startTime = getTime();
		stopAudio();
	}

	_endTime = endTime;
	_endTimeSet = true;

	if (startTime > endTime)
		return;

	if (isPlaying()) {
		// We'll assume the audio track is going to start up at the same time it just was
		// and therefore not do any seeking.
		// Might want to set it anyway if we're seekable.
		startAudioLimit(_endTime.msecs() - startTime.msecs());
		_lastTimeChange = startTime;
	}
}

void QuickTimeDecoder::seekToFrame(uint32 frame) {
	assert(_videoTrackIndex >= 0);
	assert(frame < _tracks[_videoTrackIndex]->frameCount);

	// Stop all audio (for now)
	stopAudio();

	// Track down the keyframe
	_curFrame = findKeyFrame(frame) - 1;
	while (_curFrame < (int32)frame - 1)
		decodeNextFrame();

	// Map out the starting point
	_nextFrameStartTime = 0;
	uint32 curFrame = 0;

	for (int32 i = 0; i < _tracks[_videoTrackIndex]->timeToSampleCount && curFrame < frame; i++) {
		for (int32 j = 0; j < _tracks[_videoTrackIndex]->timeToSample[i].count && curFrame < frame; j++) {
			curFrame++;
			_nextFrameStartTime += _tracks[_videoTrackIndex]->timeToSample[i].duration;
		}
	}

	// Adjust the video starting point
	const Audio::Timestamp curVideoTime(0, _nextFrameStartTime, _tracks[_videoTrackIndex]->timeScale);
	_startTime = g_system->getMillis() - curVideoTime.msecs();
	resetPauseStartTime();

	// Adjust the audio starting point
	if (_audioTrackIndex >= 0) {
		_audioStartOffset = curVideoTime;

		// Seek to the new audio location
		setAudioStreamPos(_audioStartOffset);

		// Restart the audio
		startAudio();
	}
}

void QuickTimeDecoder::seekToFrame(uint32 frame) {
	assert(_videoStreamIndex >= 0);
	assert(frame < _streams[_videoStreamIndex]->nb_frames);

	// Stop all audio (for now)
	stopAudio();

	// Track down the keyframe
	_curFrame = findKeyFrame(frame) - 1;
	while (_curFrame < (int32)frame - 1)
		decodeNextFrame();

	// Map out the starting point
	_nextFrameStartTime = 0;
	uint32 curFrame = 0;

	for (int32 i = 0; i < _streams[_videoStreamIndex]->stts_count && curFrame < frame; i++) {
		for (int32 j = 0; j < _streams[_videoStreamIndex]->stts_data[i].count && curFrame < frame; j++) {
			curFrame++;
			_nextFrameStartTime += _streams[_videoStreamIndex]->stts_data[i].duration;
		}
	}

	// Adjust the video starting point
	const Audio::Timestamp curVideoTime(0, _nextFrameStartTime, _streams[_videoStreamIndex]->time_scale);
	_startTime = g_system->getMillis() - curVideoTime.msecs();
	resetPauseStartTime();

	// Adjust the audio starting point
	if (_audioStreamIndex >= 0) {
		_audioStartOffset = curVideoTime;

		// Re-create the audio stream
		STSDEntry *entry = &_streams[_audioStreamIndex]->stsdEntries[0];
		_audStream = Audio::makeQueuingAudioStream(entry->sampleRate, entry->channels == 2);

		// First, we need to track down what audio sample we need
		Audio::Timestamp curAudioTime(0, _streams[_audioStreamIndex]->time_scale);
		uint sample = 0;
		bool done = false;
		for (int32 i = 0; i < _streams[_audioStreamIndex]->stts_count && !done; i++) {
			for (int32 j = 0; j < _streams[_audioStreamIndex]->stts_data[i].count; j++) {
				curAudioTime = curAudioTime.addFrames(_streams[_audioStreamIndex]->stts_data[i].duration);

				if (curAudioTime > curVideoTime) {
					done = true;
					break;
				}

				sample++;
			}
		}

		// Now to track down what chunk it's in
		_curAudioChunk = 0;
		uint32 totalSamples = 0;
		for (uint32 i = 0; i < _streams[_audioStreamIndex]->chunk_count; i++, _curAudioChunk++) {
			int sampleToChunkIndex = -1;

			for (uint32 j = 0; j < _streams[_audioStreamIndex]->sample_to_chunk_sz; j++)
				if (i >= _streams[_audioStreamIndex]->sample_to_chunk[j].first)
					sampleToChunkIndex = j;

			assert(sampleToChunkIndex >= 0);

			totalSamples += _streams[_audioStreamIndex]->sample_to_chunk[sampleToChunkIndex].count;

			if (sample < totalSamples) {
				totalSamples -= _streams[_audioStreamIndex]->sample_to_chunk[sampleToChunkIndex].count;
				break;
			}
		}
		
		// Reposition the audio stream
		readNextAudioChunk();
		if (sample != totalSamples) {
			// HACK: Skip a certain amount of samples from the stream
			// (There's got to be a better way to do this!)
			int16 *tempBuffer = new int16[sample - totalSamples];
			_audStream->readBuffer(tempBuffer, sample - totalSamples);
			delete[] tempBuffer;
			debug(3, "Skipping %d audio samples", sample - totalSamples);
		}
		
		// Restart the audio
		startAudio();
	}
}