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Parse SAR if available

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This commit is contained in:
Erik Zandvliet 2019-02-26 12:13:19 +01:00 • committed by Thulinma
parent 06eb78c345
commit 9a22177300
1 changed files with 80 additions and 1 deletions
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81
lib/h264.cpp
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@ -87,6 +87,9 @@ namespace h264{
uint32_t heightInMapUnits = 0;
uint32_t cropVertical = 0;
uint32_t sar_width = 0;
uint32_t sar_height = 0;
// Fill the bitstream
Utils::bitstream bs;
for (size_t i = 1; i < dataLen; i++){
@ -161,7 +164,74 @@ namespace h264{
if (bs.get(1)){
// Skipping all the paramters we dont use
if (bs.get(1)){
if (bs.get(8) == 255){bs.skip(32);}
uint8_t aspect_ratio_idc = bs.get(8);
switch (aspect_ratio_idc){
case 255:
sar_width = bs.get(16);
sar_height = bs.get(16);
break;
case 2:
sar_width = 12;
sar_height = 11;
break;
case 3:
sar_width = 10;
sar_height = 11;
break;
case 4:
sar_width = 16;
sar_height = 11;
break;
case 5:
sar_width = 40;
sar_height = 33;
break;
case 6:
sar_width = 24;
sar_height = 11;
break;
case 7:
sar_width = 20;
sar_height = 11;
break;
case 8:
sar_width = 32;
sar_height = 11;
break;
case 9:
sar_width = 80;
sar_height = 33;
break;
case 10:
sar_width = 18;
sar_height = 11;
break;
case 11:
sar_width = 15;
sar_height = 11;
break;
case 12:
sar_width = 64;
sar_height = 33;
break;
case 13:
sar_width = 160;
sar_height = 99;
break;
case 14:
sar_width = 4;
sar_height = 3;
break;
case 15:
sar_width = 3;
sar_height = 2;
break;
case 16:
sar_width = 2;
sar_height = 1;
break;
default: break;
}
}
if (bs.get(1)){bs.skip(1);}
if (bs.get(1)){
@ -184,6 +254,15 @@ namespace h264{
result.width = (widthInMbs * 16) - (cropHorizontal * 2);
result.height = ((result.mbs_only ? 1 : 2) * heightInMapUnits * 16) - (cropVertical * 2);
if (sar_width != sar_height){
if (sar_width > sar_height){
result.width = ((result.width * sar_width) / sar_height);
}else{
result.height = ((result.height * sar_height) / sar_width);
}
}
return result;
}