libretro/scummvm
1
0
Fork 0
mirror of https://github.com/libretro/scummvm.git synced 2025-04-02 14:51:40 +00:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

COMMON: added SmackerDecoder::forceSeekToFrame function

Browse Source
This commit is contained in:
neuromancer 2021-08-17 18:41:52 +02:00 committed by Eugene Sandulenko
parent 9e9aa99ea9
commit aa6e7d4fc8
2 changed files with 40 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
video/smk_decoder.cpp
View File

@ -428,6 +428,45 @@ bool SmackerDecoder::rewind() {
return true;
}
void SmackerDecoder::forceSeekToFrame(uint frame) {
const uint seekFrame = MAX<uint>(frame - 10, 0);
if (!isVideoLoaded())
return;
if (seekFrame >= getFrameCount())
return;
if (!rewind())
return;
stopAudio();
SmackerVideoTrack *videoTrack = (SmackerVideoTrack *)getTrack(0);
uint32 startPos = _fileStream->pos();
uint32 offset = 0;
for (uint32 i = 0; i < seekFrame; i++) {
videoTrack->increaseCurFrame();
// Frames with palette data contain palette entries which use
// the previous palette as their base. Therefore, we need to
// parse all palette entries up to the requested frame
if (_frameTypes[videoTrack->getCurFrame()] & 1) {
_fileStream->seek(startPos + offset, SEEK_SET);
videoTrack->unpackPalette(_fileStream);
}
offset += _frameSizes[i] & ~3;
}
if (!_fileStream->seek(startPos + offset, SEEK_SET))
return;
while (getCurFrame() < (int)frame) {
decodeNextFrame();
}
_lastTimeChange = videoTrack->getFrameTime(frame);
_startTime = g_system->getMillis() - (_lastTimeChange.msecs() / getRate()).toInt();
}
void SmackerDecoder::readNextPacket() {
SmackerVideoTrack *videoTrack = (SmackerVideoTrack *)getTrack(0);

2
video/smk_decoder.h
View File

@ -68,7 +68,7 @@ public:
virtual bool loadStream(Common::SeekableReadStream *stream);
void close();
void forceSeekToFrame(uint frame);
bool rewind();
Common::Rational getFrameRate() const;