71 lines
2.1 KiB
C++
71 lines
2.1 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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// fprintf( stderr, "NAL_Unit::ReadData --- DataSize: %d\n", InputData.size() );
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if( InputData.size() < 3 ) { return false; }
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bool AnnexB = false;
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if( InputData.substr(0,3) == ShortAnnexB ) { AnnexB = true; }
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if( InputData.substr(0,4) == FullAnnexB ) { InputData.erase(0,1); AnnexB = true; }
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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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bool FinalByteRead = false;
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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 ) { return false; }
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int UnitLen = (InputData[0] << 24) + (InputData[1] << 16) + (InputData[2] << 8) + InputData[3];
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if( InputData.size() < 4+UnitLen ) { return false; }
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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 ) { Result += (char)0x00; }
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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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