349 lines
11 KiB
C++
349 lines
11 KiB
C++
/// \file ts_packet.cpp
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/// Holds all code for the TS namespace.
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#include "ts_packet.h"
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/// This constructor creates an empty TS::Packet, ready for use for either reading or writing.
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/// All this constructor does is call TS::Packet::Clear().
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TS::Packet::Packet() { Clear( ); }
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/// This function fills a TS::Packet from provided Data.
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/// It fills the content with the first 188 bytes of Data.
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/// \param Data The data to be read into the packet.
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/// \return true if it was possible to read in a full packet, false otherwise.
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bool TS::Packet::FromString( std::string & Data ) {
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if( Data.size() < 188 ) {
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return false;
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} else {
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for( int i = 0; i < 188; i++ ) { Buffer[i] = Data[i]; }
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Data.erase(0,188);
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Free = 0;
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}
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return true;
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}
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/// The deconstructor deletes all space that may be occupied by a TS::Packet.
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TS::Packet::~Packet() { }
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/// Sets the PID of a single TS::Packet.
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/// \param NewPID The new PID of the packet.
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void TS::Packet::PID( int NewPID ) {
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Buffer[1] = (Buffer[1] & 0xE0) + ((NewPID & 0x1F00) >> 8 );
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Buffer[2] = (NewPID & 0x00FF);
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Free = std::min( Free, 184 );
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}
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/// Gets the PID of a single TS::Packet.
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/// \return The value of the PID.
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int TS::Packet::PID() {
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return (( Buffer[1] & 0x1F ) << 8 ) + Buffer[2];
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}
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/// Sets the Continuity Counter of a single TS::Packet.
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/// \param NewContinuity The new Continuity Counter of the packet.
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void TS::Packet::ContinuityCounter( int NewContinuity ) {
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Buffer[3] = ( Buffer[3] & 0xF0 ) + ( NewContinuity & 0x0F );
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Free = std::min( Free, 184 );
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}
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/// Gets the Continuity Counter of a single TS::Packet.
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/// \return The value of the Continuity Counter.
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int TS::Packet::ContinuityCounter() {
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return ( Buffer[3] & 0x0F );
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}
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/// Gets the amount of bytes that are not written yet in a TS::Packet.
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/// \return The amount of bytes that can still be written to this packet.
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int TS::Packet::BytesFree( ) {
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return Free;
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}
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/// Clears a TS::Packet.
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void TS::Packet::Clear( ) {
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Free = 184;
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Buffer[0] = 0x47;
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for( int i = 1; i < 188; i++ ) { Buffer[i] = 0x00; }
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AdaptationField( 1 );
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}
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/// Sets the selection value for an adaptationfield of a TS::Packet.
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/// \param NewSelector The new value of the selection bits.
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/// - 1: No AdaptationField.
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/// - 2: AdaptationField Only.
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/// - 3: AdaptationField followed by Data.
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void TS::Packet::AdaptationField( int NewSelector ) {
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Buffer[3] = ( Buffer[3] & 0xCF ) + ((NewSelector & 0x03) << 4);
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Buffer[4] = 0;
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Free = std::min( Free, 184 );
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}
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/// Gets whether a TS::Packet contains an adaptationfield.
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/// \return The existence of an adaptationfield.
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/// - 0: No adaptationfield present.
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/// - 1: Adaptationfield is present.
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int TS::Packet::AdaptationField( ) {
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return ((Buffer[3] & 0x30) >> 4 );
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}
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/// Sets the PCR (Program Clock Reference) of a TS::Packet.
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/// \param NewVal The new PCR Value.
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void TS::Packet::PCR( int64_t NewVal ) {
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AdaptationField( 3 );
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Buffer[4] = 7;
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Buffer[5] = (Buffer[5] | 0x10 );
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int64_t TmpVal = NewVal / 300;
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fprintf( stderr, "\tSetting PCR_Base: %d\n", TmpVal );
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Buffer[6] = (((TmpVal>>1)>>24) & 0xFF);
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Buffer[7] = (((TmpVal>>1)>>16) & 0xFF);
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Buffer[8] = (((TmpVal>>1)>>8) & 0xFF);
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Buffer[9] = ((TmpVal>>1) & 0xFF);
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int Remainder = NewVal % 300;
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Buffer[10] = 0x7E + ((TmpVal & 0x01)<<7) + ((Remainder & 0x0100) >> 8 );
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Buffer[11] = (Remainder & 0x00FF);
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Free = std::min( Free, 176 );
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};
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/// Gets the PCR (Program Clock Reference) of a TS::Packet.
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/// \return The value of the PCR.
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int64_t TS::Packet::PCR( ) {
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if( !AdaptationField() ) {
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return -1;
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}
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if( !(Buffer[5] & 0x10 ) ) {
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return -1;
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}
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int64_t Result = 0;
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Result = (((((((Buffer[6] << 8) + Buffer[7]) << 8) + Buffer[8]) << 8) + Buffer[9]) << 1) + ( Buffer[10] & 0x80 );
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Result = Result * 300;
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Result += ((Buffer[10] & 0x01) << 8 + Buffer[11]);
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return Result;
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}
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/// Gets the current length of the adaptationfield.
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/// \return The length of the adaptationfield.
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int TS::Packet::AdaptationFieldLen( ) {
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if( !AdaptationField() ) {
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return -1;
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}
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return (int)Buffer[4];
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}
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/// Prints a packet to stdout, for analyser purposes.
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void TS::Packet::Print( ) {
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std::cout << "TS Packet: " << (Buffer[0] == 0x47)
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<< "\n\tNewUnit: " << UnitStart()
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<< "\n\tPID: " << PID()
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<< "\n\tContinuity Counter: " << ContinuityCounter()
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<< "\n\tAdaption Field: " << AdaptationField() << "\n";
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if( AdaptationField() ) {
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std::cout << "\t\tAdaption Field Length: " << AdaptationFieldLen() << "\n";
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if( AdaptationFieldLen() ) {
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std::cout << "\t\tRandom Access: " << RandomAccess() << "\n";
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}
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if( PCR() != -1 ) {
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std::cout << "\t\tPCR: " << PCR() << "( " << (double)PCR() / 27000000 << " s )\n";
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}
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}
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}
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/// Gets whether a new unit starts in this TS::Packet.
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/// \return The start of a new unit.
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int TS::Packet::UnitStart( ) {
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return ( Buffer[1] & 0x40) >> 6;
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}
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/// Sets the start of a new unit in this TS::Packet.
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/// \param NewVal The new value for the start of a unit.
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void TS::Packet::UnitStart( int NewVal ) {
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if( NewVal ) {
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Buffer[1] = (Buffer[1] | 0x40);
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} else {
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Buffer[1] = (Buffer[1] & 0xBF);
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}
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}
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/// Gets whether this TS::Packet can be accessed at random (indicates keyframe).
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/// \return Whether or not this TS::Packet contains a keyframe.
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int TS::Packet::RandomAccess( ) {
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if( AdaptationField() < 2 ) {
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return -1;
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}
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return ( Buffer[5] & 0x40) >> 6;
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}
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/// Sets whether this TS::Packet contains a keyframe
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/// \param NewVal Whether or not this TS::Packet contains a keyframe.
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void TS::Packet::RandomAccess( int NewVal ) {
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if( AdaptationField() ) {
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if( Buffer[4] == 0 ) {
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Buffer[4] = 1;
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}
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if( NewVal ) {
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Buffer[5] = (Buffer[5] | 0x40);
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} else {
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Buffer[5] = (Buffer[5] & 0xBF);
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}
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} else {
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AdaptationField( 3 );
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Buffer[4] = 1;
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if( NewVal ) {
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Buffer[5] = 0x40;
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} else {
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Buffer[5] = 0x00;
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}
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}
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Free = std::min( Free, 182 );
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}
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/// Transforms the TS::Packet into a standard Program Association Table
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void TS::Packet::DefaultPAT( ) {
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static int MyCntr = 0;
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std::copy( TS::PAT, TS::PAT + 188, Buffer );
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ContinuityCounter( MyCntr );
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Free = 0;
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MyCntr = ( (MyCntr + 1) % 0x10);
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}
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/// Transforms the TS::Packet into a standard Program Mapping Table
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void TS::Packet::DefaultPMT( ) {
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static int MyCntr = 0;
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std::copy( TS::PMT, TS::PMT + 188, Buffer );
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ContinuityCounter( MyCntr );
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Free = 0;
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MyCntr = ( (MyCntr + 1) % 0x10);
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}
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/// Generates a string from the contents of the TS::Packet
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/// \return A string representation of the packet.
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char* TS::Packet::ToString( ) {
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return Buffer;
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}
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/// Generates a PES Lead-in for a video frame.
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/// Starts at the first Free byte.
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/// \param NewLen The length of this video frame.
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void TS::Packet::PESVideoLeadIn( int NewLen ) {
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static int PTS = 126000;
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NewLen += 14;
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int Offset = ( 188 - Free );
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Buffer[Offset] = 0x00;//PacketStartCodePrefix
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Buffer[Offset+1] = 0x00;//PacketStartCodePrefix (Cont)
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Buffer[Offset+2] = 0x01;//PacketStartCodePrefix (Cont)
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Buffer[Offset+3] = 0xe0;//StreamType Video
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Buffer[Offset+4] = (NewLen & 0xFF00) >> 8;//PES PacketLength
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Buffer[Offset+5] = (NewLen & 0x00FF);//PES PacketLength (Cont)
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Buffer[Offset+6] = 0x80;//Reserved + Flags
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Buffer[Offset+7] = 0x80;//PTSOnlyFlag + Flags
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Buffer[Offset+8] = 0x05;//PESHeaderDataLength
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Buffer[Offset+9] = 0x20 + ((PTS & 0x1C0000000) >> 29 ) + 1;//PTS
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Buffer[Offset+10] = 0x00 + ((PTS & 0x03FC00000) >> 22 );//PTS (Cont)
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Buffer[Offset+11] = 0x00 + ((PTS & 0x0003F8000) >> 14 ) + 1;//PTS (Cont)
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Buffer[Offset+12] = 0x00 + ((PTS & 0x000007F80) >> 7 );//PTS (Cont)
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Buffer[Offset+13] = 0x00 + ((PTS & 0x00000007F) << 1) + 1;//PTS (Cont)
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//PesPacket-Wise Prepended Data
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Buffer[Offset+14] = 0x00;//NALU StartCode
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Buffer[Offset+15] = 0x00;//NALU StartCode (Cont)
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Buffer[Offset+16] = 0x00;//NALU StartCode (Cont)
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Buffer[Offset+17] = 0x01;//NALU StartCode (Cont)
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Buffer[Offset+18] = 0x09;//NALU EndOfPacket (Einde Vorige Packet)
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Buffer[Offset+19] = 0xF0;//NALU EndOfPacket (Cont)
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Free = Free - 20;
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PTS += 3003;
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}
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/// Generates a PES Lead-in for an audio frame.
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/// Starts at the first Free byte.
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/// \param NewLen The length of this audio frame.
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/// \param PTS The timestamp of the audio frame.
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void TS::Packet::PESAudioLeadIn( int NewLen, uint64_t PTS ) {
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NewLen += 8;
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int Offset = ( 188 - Free ) - 2;
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Buffer[Offset] = 0x00;//PacketStartCodePrefix
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Buffer[Offset+1] = 0x00;//PacketStartCodePrefix (Cont)
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Buffer[Offset+2] = 0x01;//PacketStartCodePrefix (Cont)
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Buffer[Offset+3] = 0xc0;//StreamType Video
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Buffer[Offset+4] = (NewLen & 0xFF00) >> 8;//PES PacketLength
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Buffer[Offset+5] = (NewLen & 0x00FF);//PES PacketLength (Cont)
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Buffer[Offset+6] = 0x80;//Reserved + Flags
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Buffer[Offset+7] = 0x80;//PTSOnlyFlag + Flags
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Buffer[Offset+8] = 0x05;//PESHeaderDataLength
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Buffer[Offset+9] = 0x20 + ((PTS & 0x1C0000000) >> 29 ) + 1;//PTS
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Buffer[Offset+10] = 0x00 + ((PTS & 0x03FC00000) >> 22 );//PTS (Cont)
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Buffer[Offset+11] = 0x00 + ((PTS & 0x0003F8000) >> 14 ) + 1;//PTS (Cont)
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Buffer[Offset+12] = 0x00 + ((PTS & 0x000007F80) >> 7 );//PTS (Cont)
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Buffer[Offset+13] = 0x00 + ((PTS & 0x00000007F) << 1) + 1;//PTS (Cont)
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Free = Free - 12;
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}
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/// Fills the free bytes of the TS::Packet.
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/// Stores as many bytes from NewVal as possible in the packet.
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/// \param NewVal The data to store in the packet.
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void TS::Packet::FillFree( std::string & NewVal ) {
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int Offset = 188 - Free;
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std::copy( NewVal.begin(), NewVal.begin() + Free, Buffer + Offset );
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NewVal.erase(0,Free);
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Free = 0;
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}
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/// Adds NumBytes of stuffing to the TS::Packet.
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/// \param NumBytes the amount of stuffing bytes.
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void TS::Packet::AddStuffing( int NumBytes ) {
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if( NumBytes <= 0 ) { return; }
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if( AdaptationField( ) == 3 ) {
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int Offset = Buffer[4];
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Buffer[4] = Offset + NumBytes - 1;
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for( int i = 0; i < ( NumBytes -2 ); i ++ ) {
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Buffer[6+Offset+i] = 0xFF;
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}
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Free -= NumBytes;
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} else {
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AdaptationField( 3 );
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Buffer[4] = NumBytes - 1;
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Buffer[5] = 0x00;
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for( int i = 0; i < ( NumBytes -2 ); i ++ ) {
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Buffer[6+i] = 0xFF;
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}
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Free -= NumBytes;
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}
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}
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/// Transforms this TS::Packet into a standard Service Description Table
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void TS::Packet::FFMpegHeader( ) {
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static int MyCntr = 0;
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std::copy( TS::SDT, TS::SDT + 188, Buffer );
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ContinuityCounter( MyCntr );
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Free = 0;
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MyCntr = ( (MyCntr + 1) % 0x10);
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}
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int TS::Packet::PESTimeStamp( ) {
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if( !UnitStart( ) ) { return -1; }
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int PesOffset = 4;
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if( AdaptationField( ) >= 2 ) { PesOffset += 1 + AdaptationFieldLen( ); }
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fprintf( stderr, "PES Offset: %d\n", PesOffset );
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fprintf( stderr, "PES StartCode: %0.2X %0.2X %0.2X\n", Buffer[PesOffset], Buffer[PesOffset+1], Buffer[PesOffset+2] );
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int MyTimestamp = (Buffer[PesOffset+9] & 0x0F) >> 1;
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MyTimestamp = (MyTimestamp << 8) + Buffer[PesOffset+10];
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MyTimestamp = (MyTimestamp << 7) + ((Buffer[PesOffset+11]) >> 1);
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MyTimestamp = (MyTimestamp << 8) + Buffer[PesOffset+12];
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MyTimestamp = (MyTimestamp << 7) + ((Buffer[PesOffset+13]) >> 1);
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fprintf( stderr, "PES Timestamp: %d\n", MyTimestamp );
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return MyTimestamp;
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}
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int TS::Packet::GetDataOffset( ) {
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int Offset = 4;
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if( AdaptationField( ) >= 2 ) {
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Offset += 1 + AdaptationFieldLen( );
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}
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if( UnitStart() ) {
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Offset += 8;//Default Header + Flag Bytes
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Offset += 1 + Buffer[Offset];//HeaderLengthByte + HeaderLength
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}
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return Offset;
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}
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