void AVIDecoder::AVIAudioTrack::skipAudio(const Audio::Timestamp &time, const Audio::Timestamp &frameTime) {
Audio::Timestamp timeDiff = time.convertToFramerate(_wvInfo.samplesPerSec) - frameTime.convertToFramerate(_wvInfo.samplesPerSec);
int skipFrames = timeDiff.totalNumberOfFrames();
if (skipFrames <= 0)
return;
Audio::AudioStream *audioStream = getAudioStream();
if (!audioStream)
return;
if (audioStream->isStereo())
skipFrames *= 2;
int16 *tempBuffer = new int16[skipFrames];
audioStream->readBuffer(tempBuffer, skipFrames);
delete[] tempBuffer;
}
bool QuickTimeDecoder::VideoTrackHandler::seek(const Audio::Timestamp &requestedTime) {
uint32 convertedFrames = requestedTime.convertToFramerate(_decoder->_timeScale).totalNumberOfFrames();
for (_curEdit = 0; !atLastEdit(); _curEdit++)
if (convertedFrames >= _parent->editList[_curEdit].timeOffset && convertedFrames < _parent->editList[_curEdit].timeOffset + _parent->editList[_curEdit].trackDuration)
break;
// If we did reach the end of the track, break out
if (atLastEdit())
return true;
// If this track is in an empty edit, position us at the next non-empty
// edit. There's nothing else to do after this.
if (_parent->editList[_curEdit].mediaTime == -1) {
while (!atLastEdit() && _parent->editList[_curEdit].mediaTime == -1)
_curEdit++;
if (!atLastEdit())
enterNewEditList(true);
return true;
}
enterNewEditList(false);
// One extra check for the end of a track
if (atLastEdit())
return true;
// Now we're in the edit and need to figure out what frame we need
Audio::Timestamp time = requestedTime.convertToFramerate(_parent->timeScale);
while (getRateAdjustedFrameTime() < (uint32)time.totalNumberOfFrames()) {
_curFrame++;
if (_durationOverride >= 0) {
_nextFrameStartTime += _durationOverride;
_durationOverride = -1;
} else {
_nextFrameStartTime += getFrameDuration();
}
}
// All that's left is to figure out what our starting time is going to be
// Compare the starting point for the frame to where we need to be
_holdNextFrameStartTime = getRateAdjustedFrameTime() != (uint32)time.totalNumberOfFrames();
// If we went past the time, go back a frame. _curFrame before this point is at the frame
// that should be displayed. This adjustment ensures it is on the frame before the one that
// should be displayed.
if (_holdNextFrameStartTime)
_curFrame--;
if (_reversed) {
// Call setReverse again to update
setReverse(true);
} else {
// Handle the keyframe here
int32 destinationFrame = _curFrame + 1;
assert(destinationFrame < (int32)_parent->frameCount);
_curFrame = findKeyFrame(destinationFrame) - 1;
while (_curFrame < destinationFrame - 1)
bufferNextFrame();
}
return true;
}