void SmackerDecoder::readNextPacket() {
SmackerVideoTrack *videoTrack = (SmackerVideoTrack *)getTrack(0);
if (videoTrack->endOfTrack())
return;
videoTrack->increaseCurFrame();
uint i;
uint32 chunkSize = 0;
uint32 dataSizeUnpacked = 0;
uint32 startPos = _fileStream->pos();
// Check if we got a frame with palette data, and
// call back the virtual setPalette function to set
// the current palette
if (_frameTypes[videoTrack->getCurFrame()] & 1)
videoTrack->unpackPalette(_fileStream);
// Load audio tracks
for (i = 0; i < 7; ++i) {
if (!(_frameTypes[videoTrack->getCurFrame()] & (2 << i)))
continue;
chunkSize = _fileStream->readUint32LE();
chunkSize -= 4; // subtract the first 4 bytes (chunk size)
if (_header.audioInfo[i].compression == kCompressionNone) {
dataSizeUnpacked = chunkSize;
} else {
dataSizeUnpacked = _fileStream->readUint32LE();
chunkSize -= 4; // subtract the next 4 bytes (unpacked data size)
}
handleAudioTrack(i, chunkSize, dataSizeUnpacked);
}
uint32 frameSize = _frameSizes[videoTrack->getCurFrame()] & ~3;
// uint32 remainder = _frameSizes[videoTrack->getCurFrame()] & 3;
if (_fileStream->pos() - startPos > frameSize)
error("Smacker actual frame size exceeds recorded frame size");
uint32 frameDataSize = frameSize - (_fileStream->pos() - startPos);
byte *frameData = (byte *)malloc(frameDataSize + 1);
// Padding to keep the BigHuffmanTrees from reading past the data end
frameData[frameDataSize] = 0x00;
_fileStream->read(frameData, frameDataSize);
Common::BitStream8LSB bs(new Common::MemoryReadStream(frameData, frameDataSize + 1, DisposeAfterUse::YES), true);
videoTrack->decodeFrame(bs);
_fileStream->seek(startPos + frameSize);
}
void NeverhoodSmackerDecoder::forceSeekToFrame(uint frame) {
if (!isVideoLoaded())
return;
if (frame >= getFrameCount())
error("Can't force Smacker seek to invalid frame %d", frame);
if (_header.audioInfo[0].hasAudio)
error("Can't force Smacker frame seek with audio");
if (!rewind())
error("Failed to rewind");
SmackerVideoTrack *videoTrack = (SmackerVideoTrack *)getTrack(0);
uint32 offset = 0;
for (uint32 i = 0; i < frame; i++) {
videoTrack->increaseCurFrame();
offset += _frameSizes[i] & ~3;
}
_fileStream->seek(offset, SEEK_CUR);
}