const Graphics::Surface *QuickTimeDecoder::VideoTrackHandler::decodeNextFrame() {
if (endOfTrack())
return 0;
const Graphics::Surface *frame = bufferNextFrame();
if (_holdNextFrameStartTime) {
// Don't set the next frame start time here; we just did a seek
_holdNextFrameStartTime = false;
} else if (_durationOverride >= 0) {
// Use our own duration from the edit list calculation
_nextFrameStartTime += _durationOverride;
_durationOverride = -1;
} else {
_nextFrameStartTime += getFrameDuration();
}
// Update the edit list, if applicable
// HACK: We're also accepting the time minus one because edit lists
// aren't as accurate as one would hope.
if (!endOfTrack() && getRateAdjustedFrameTime() >= getCurEditTimeOffset() + getCurEditTrackDuration() - 1) {
_curEdit++;
if (!endOfTrack())
enterNewEditList(true);
}
if (_scaledSurface) {
_decoder->scaleSurface(frame, _scaledSurface, _parent->scaleFactorX, _parent->scaleFactorY);
return _scaledSurface;
}
return frame;
}
uint32 QuickTimeDecoder::VideoTrackHandler::getNextFrameStartTime() {
if (endOfTrack())
return 0;
// Convert to milliseconds so the tracks can be compared
return getRateAdjustedFrameTime() * 1000 / _parent->timeScale;
}
void QuickTimeDecoder::VideoTrackHandler::enterNewEditList(bool bufferFrames) {
// Bypass all empty edit lists first
while (!endOfTrack() && _parent->editList[_curEdit].mediaTime == -1)
_curEdit++;
if (endOfTrack())
return;
uint32 frameNum = 0;
bool done = false;
uint32 totalDuration = 0;
uint32 prevDuration = 0;
// Track down where the mediaTime is in the media
for (int32 i = 0; i < _parent->timeToSampleCount && !done; i++) {
for (int32 j = 0; j < _parent->timeToSample[i].count; j++) {
if (totalDuration == (uint32)_parent->editList[_curEdit].mediaTime) {
done = true;
prevDuration = totalDuration;
break;
} else if (totalDuration > (uint32)_parent->editList[_curEdit].mediaTime) {
done = true;
frameNum--;
break;
}
prevDuration = totalDuration;
totalDuration += _parent->timeToSample[i].duration;
frameNum++;
}
}
if (bufferFrames) {
// Track down the keyframe
_curFrame = findKeyFrame(frameNum) - 1;
while (_curFrame < (int32)frameNum - 1)
bufferNextFrame();
} else {
_curFrame = frameNum - 1;
}
_nextFrameStartTime = getCurEditTimeOffset();
// Set an override for the duration since we came up in-between two frames
if (prevDuration != totalDuration)
_durationOverride = totalDuration - prevDuration;
}
uint32 VideoDecoder::FixedRateVideoTrack::getNextFrameStartTime() const {
if (endOfTrack() || getCurFrame() < 0)
return 0;
Common::Rational time = (getCurFrame() + 1) * 1000;
time /= getFrameRate();
return time.toInt();
}
void QuickTimeDecoder::VideoTrackHandler::seekToTime(Audio::Timestamp time) {
// First, figure out what edit we're in
time = time.convertToFramerate(_parent->timeScale);
// Continue until we get to where we need to be
for (_curEdit = 0; !endOfTrack(); _curEdit++)
if ((uint32)time.totalNumberOfFrames() >= getCurEditTimeOffset() && (uint32)time.totalNumberOfFrames() < getCurEditTimeOffset() + getCurEditTrackDuration())
break;
// This track is done
if (endOfTrack())
return;
enterNewEditList(false);
// One extra check for the end of a track
if (endOfTrack())
return;
// Now we're in the edit and need to figure out what frame we need
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
if (_holdNextFrameStartTime)
_curFrame--;
// Handle the keyframe here
int32 destinationFrame = _curFrame + 1;
assert(destinationFrame < (int32)_parent->frameCount);
_curFrame = findKeyFrame(destinationFrame) - 1;
while (_curFrame < destinationFrame - 1)
bufferNextFrame();
}
bool FlicDecoder::FlicVideoTrack::rewind() {
if (endOfTrack() && _fileStream->pos() < _fileStream->size() && _frameCount != 1)
_atRingFrame = true;
else
_fileStream->seek(_offsetFrame1);
_curFrame = -1;
_nextFrameStartTime = 0;
_frameDelay = _startFrameDelay;
return true;
}
uint32 VideoDecoder::FixedRateVideoTrack::getNextFrameStartTime() const {
if (endOfTrack() || getCurFrame() < 0)
return 0;
return getFrameTime(getCurFrame() + 1).msecs();
}
const Graphics::Surface *QuickTimeDecoder::VideoTrackHandler::decodeNextFrame() {
if (endOfTrack())
return 0;
if (_reversed) {
// Subtract one to place us on the frame before the current displayed frame.
_curFrame--;
// We have one "dummy" frame at the end to so the last frame is displayed
// for the right amount of time.
if (_curFrame < 0)
return 0;
// Decode from the last key frame to the frame before the one we need.
// TODO: Probably would be wise to do some caching
int targetFrame = _curFrame;
_curFrame = findKeyFrame(targetFrame) - 1;
while (_curFrame != targetFrame - 1)
bufferNextFrame();
}
const Graphics::Surface *frame = bufferNextFrame();
if (_reversed) {
if (_holdNextFrameStartTime) {
// Don't set the next frame start time here; we just did a seek
_holdNextFrameStartTime = false;
} else {
// Just need to subtract the time
_nextFrameStartTime -= getFrameDuration();
}
} else {
if (_holdNextFrameStartTime) {
// Don't set the next frame start time here; we just did a seek
_holdNextFrameStartTime = false;
} else if (_durationOverride >= 0) {
// Use our own duration from the edit list calculation
_nextFrameStartTime += _durationOverride;
_durationOverride = -1;
} else {
_nextFrameStartTime += getFrameDuration();
}
// Update the edit list, if applicable
// HACK: We're also accepting the time minus one because edit lists
// aren't as accurate as one would hope.
if (!atLastEdit() && getRateAdjustedFrameTime() >= getCurEditTimeOffset() + getCurEditTrackDuration() - 1) {
_curEdit++;
if (!atLastEdit())
enterNewEditList(true);
}
}
if (frame && (_parent->scaleFactorX != 1 || _parent->scaleFactorY != 1)) {
if (!_scaledSurface) {
_scaledSurface = new Graphics::Surface();
_scaledSurface->create(getScaledWidth().toInt(), getScaledHeight().toInt(), getPixelFormat());
}
_decoder->scaleSurface(frame, _scaledSurface, _parent->scaleFactorX, _parent->scaleFactorY);
return _scaledSurface;
}
return frame;
}
