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Skip over the h264 scaling list when it is present.

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This commit is contained in:
Erik Zandvliet 2016-07-06 12:52:07 +02:00 • committed by Thulinma
parent bd6ad88f76
commit f7b7f54584
1 changed files with 26 additions and 3 deletions
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29
lib/h264.cpp
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@ -88,6 +88,18 @@ namespace h264 {
dataLen = Bit::btohs(dtscInit.data() + 6);
}
void skipScalingList(Utils::bitstream & bs, size_t listSize){
size_t lastScale = 8;
size_t nextScale = 8;
for (size_t i = 0; i < listSize; i++){
if (nextScale){
uint64_t deltaScale = bs.getExpGolomb();
nextScale = (lastScale + deltaScale + 256) % 256;
}
lastScale = (nextScale ? nextScale : lastScale);
}
}
SPSMeta sequenceParameterSet::getCharacteristics() const {
SPSMeta result;
@ -121,14 +133,25 @@ namespace h264 {
bs.getUExpGolomb();
if (profileIdc == 100 || profileIdc == 110 || profileIdc == 122 || profileIdc == 244 || profileIdc == 44 || profileIdc == 83 || profileIdc == 86 || profileIdc == 118 || profileIdc == 128) {
//chroma format idc
if (bs.getUExpGolomb() == 3) {
char chromaFormatIdc = bs.getUExpGolomb();
if (chromaFormatIdc == 3) {
bs.skip(1);
}
bs.getUExpGolomb();
bs.getUExpGolomb();
bs.skip(1);
if (bs.get(1)) {
DEBUG_MSG(DLVL_DEVEL, "Scaling matrix not implemented yet");
if (bs.get(1)) {//Scaling matrix is present
char listSize = (chromaFormatIdc == 3 ? 12 : 8);
for (size_t i = 0; i < listSize; i++){
bool thisListPresent = bs.get(1);
if (thisListPresent){
if (i < 6){
skipScalingList(bs, 16);
}else{
skipScalingList(bs, 64);
}
}
}
}
}
bs.getUExpGolomb();