82 lines
2 KiB
C++
82 lines
2 KiB
C++
#include "nal.h"
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NAL_Unit::NAL_Unit(){
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}
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NAL_Unit::NAL_Unit(std::string & InputData){
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ReadData(InputData);
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}
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bool NAL_Unit::ReadData(std::string & InputData){
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std::string FullAnnexB;
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FullAnnexB += (char)0x00;
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FullAnnexB += (char)0x00;
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FullAnnexB += (char)0x00;
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FullAnnexB += (char)0x01;
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std::string ShortAnnexB;
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ShortAnnexB += (char)0x00;
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ShortAnnexB += (char)0x00;
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ShortAnnexB += (char)0x01;
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if (InputData.size() < 3){
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return false;
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}
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bool AnnexB = false;
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if (InputData.substr(0, 3) == ShortAnnexB){
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AnnexB = true;
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}
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if (InputData.substr(0, 4) == FullAnnexB){
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InputData.erase(0, 1);
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AnnexB = true;
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}
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if (AnnexB){
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MyData = "";
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InputData.erase(0, 3); //Intro Bytes
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int Location = std::min(InputData.find(ShortAnnexB), InputData.find(FullAnnexB));
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MyData = InputData.substr(0, Location);
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InputData.erase(0, Location);
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}else{
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if (InputData.size() < 4){
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return false;
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}
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unsigned int UnitLen = (InputData[0] << 24) + (InputData[1] << 16) + (InputData[2] << 8) + InputData[3];
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if (InputData.size() < 4 + UnitLen){
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return false;
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}
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InputData.erase(0, 4); //Remove Length
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MyData = InputData.substr(0, UnitLen);
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InputData.erase(0, UnitLen); //Remove this unit from the string
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}
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return true;
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}
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std::string NAL_Unit::AnnexB(bool LongIntro){
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std::string Result;
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if (MyData.size()){
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if (LongIntro){
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Result += (char)0x00;
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}
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Result += (char)0x00;
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Result += (char)0x00;
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Result += (char)0x01; //Annex B Lead-In
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Result += MyData;
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}
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return Result;
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}
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std::string NAL_Unit::SizePrepended(){
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std::string Result;
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if (MyData.size()){
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int DataSize = MyData.size();
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Result += (char)((DataSize & 0xFF000000) >> 24);
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Result += (char)((DataSize & 0x00FF0000) >> 16);
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Result += (char)((DataSize & 0x0000FF00) >> 8);
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Result += (char)(DataSize & 0x000000FF); //Size Lead-In
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Result += MyData;
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}
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return Result;
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}
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int NAL_Unit::Type(){
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return (MyData[0] & 0x1F);
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}
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