void QuickTimeDecoder::updateAudioBuffer() {
if (!_audStream)
return;
uint32 numberOfChunksNeeded = 0;
if (_videoTrackIndex < 0 || _curFrame == (int32)_tracks[_videoTrackIndex]->frameCount - 1) {
// If we have no video, there's nothing to base our buffer against
// However, one must ask why a QuickTimeDecoder is being used instead of the nice makeQuickTimeStream() function
// If we're on the last frame, make sure all audio remaining is buffered
numberOfChunksNeeded = _tracks[_audioTrackIndex]->chunkCount;
} else {
Audio::QuickTimeAudioDecoder::AudioSampleDesc *entry = (Audio::QuickTimeAudioDecoder::AudioSampleDesc *)_tracks[_audioTrackIndex]->sampleDescs[0];
// Calculate the amount of chunks we need in memory until the next frame
uint32 timeToNextFrame = getTimeToNextFrame();
uint32 timeFilled = 0;
uint32 curAudioChunk = _curAudioChunk - _audStream->numQueuedStreams();
for (; timeFilled < timeToNextFrame && curAudioChunk < _tracks[_audioTrackIndex]->chunkCount; numberOfChunksNeeded++, curAudioChunk++) {
uint32 sampleCount = entry->getAudioChunkSampleCount(curAudioChunk);
assert(sampleCount);
timeFilled += sampleCount * 1000 / entry->_sampleRate;
}
// Add a couple extra to ensure we don't underrun
numberOfChunksNeeded += 3;
}
// Keep three streams in buffer so that if/when the first two end, it goes right into the next
while (_audStream->numQueuedStreams() < numberOfChunksNeeded && _curAudioChunk < _tracks[_audioTrackIndex]->chunkCount)
queueNextAudioChunk();
}
void QuickTimeDecoder::updateAudioBuffer() {
if (_audioTrackIndex < 0)
return;
uint32 numberOfChunksNeeded = 0;
if (_curFrame == (int32)_tracks[_videoTrackIndex]->frameCount - 1) {
// If we're on the last frame, make sure all audio remaining is buffered
numberOfChunksNeeded = _tracks[_audioTrackIndex]->chunkCount;
} else {
AudioSampleDesc *entry = (AudioSampleDesc *)_tracks[_audioTrackIndex]->sampleDescs[0];
// Calculate the amount of chunks we need in memory until the next frame
uint32 timeToNextFrame = getTimeToNextFrame();
uint32 timeFilled = 0;
uint32 curAudioChunk = _curAudioChunk - getNumQueuedStreams();
for (; timeFilled < timeToNextFrame && curAudioChunk < _tracks[_audioTrackIndex]->chunkCount; numberOfChunksNeeded++, curAudioChunk++) {
uint32 sampleCount = entry->getAudioChunkSampleCount(curAudioChunk);
assert(sampleCount);
timeFilled += sampleCount * 1000 / entry->_sampleRate;
}
// Add a couple extra to ensure we don't underrun
numberOfChunksNeeded += 3;
}
// Keep three streams in buffer so that if/when the first two end, it goes right into the next
while (getNumQueuedStreams() < numberOfChunksNeeded && _curAudioChunk < _tracks[_audioTrackIndex]->chunkCount)
queueNextAudioChunk();
}
