bool KaxCluster::AddFrameInternal(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, KaxBlockGroup * & MyNewBlock, const KaxBlockGroup * PastBlock, const KaxBlockGroup * ForwBlock, LacingType lacing)
{
if (!bFirstFrameInside) {
bFirstFrameInside = true;
MinTimecode = MaxTimecode = timecode;
} else {
if (timecode < MinTimecode)
MinTimecode = timecode;
if (timecode > MaxTimecode)
MaxTimecode = timecode;
}
MyNewBlock = NULL;
if (lacing == LACING_NONE || !track.LacingEnabled()) {
currentNewBlock = NULL;
}
// force creation of a new block
if (currentNewBlock == NULL || uint32(track.TrackNumber()) != uint32(currentNewBlock->TrackNumber()) || PastBlock != NULL || ForwBlock != NULL) {
KaxBlockGroup & aNewBlock = GetNewBlock();
MyNewBlock = currentNewBlock = &aNewBlock;
}
if (PastBlock != NULL) {
if (ForwBlock != NULL) {
if (currentNewBlock->AddFrame(track, timecode, buffer, *PastBlock, *ForwBlock, lacing)) {
// more data are allowed in this Block
return true;
} else {
currentNewBlock = NULL;
return false;
}
} else {
if (currentNewBlock->AddFrame(track, timecode, buffer, *PastBlock, lacing)) {
// more data are allowed in this Block
return true;
} else {
currentNewBlock = NULL;
return false;
}
}
} else {
if (currentNewBlock->AddFrame(track, timecode, buffer, lacing)) {
// more data are allowed in this Block
return true;
} else {
currentNewBlock = NULL;
return false;
}
}
}
/*!
\todo handle flags
\todo hardcoded limit of the number of frames in a lace should be a parameter
\return true if more frames can be added to this Block
*/
bool KaxInternalBlock::AddFrame(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, LacingType lacing, bool invisible)
{
SetValueIsSet();
if (myBuffers.size() == 0) {
// first frame
Timecode = timecode;
TrackNumber = track.TrackNumber();
mInvisible = invisible;
mLacing = lacing;
}
myBuffers.push_back(&buffer);
// we don't allow more than 8 frames in a Block because the overhead improvement is minimal
if (myBuffers.size() >= 8 || lacing == LACING_NONE)
return false;
if (lacing == LACING_XIPH)
// decide wether a new frame can be added or not
// a frame in a lace is not efficient when the place necessary to code it in a lace is bigger
// than the size of a simple Block. That means more than 6 bytes (4 in struct + 2 for EBML) to code the size
return (buffer.Size() < 6*0xFF);
else
return true;
}