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| | | /********** |
| | | This library is free software; you can redistribute it and/or modify it under |
| | | the terms of the GNU Lesser General Public License as published by the |
| | | Free Software Foundation; either version 3 of the License, or (at your |
| | | option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| | | |
| | | This library is distributed in the hope that it will be useful, but WITHOUT |
| | | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| | | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
| | | more details. |
| | | |
| | | You should have received a copy of the GNU Lesser General Public License |
| | | along with this library; if not, write to the Free Software Foundation, Inc., |
| | | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | | **********/ |
| | | // "liveMedia" |
| | | // Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved. |
| | | // A class for generating MPEG-2 Transport Stream from one or more input |
| | | // Elementary Stream data sources |
| | | // C++ header |
| | | |
| | | #ifndef _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH |
| | | #define _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH |
| | | |
| | | #ifndef _FRAMED_SOURCE_HH |
| | | #include "FramedSource.hh" |
| | | #endif |
| | | #ifndef _MPEG_1OR2_DEMUX_HH |
| | | #include "MPEG1or2Demux.hh" // for SCR |
| | | #endif |
| | | |
| | | #define PID_TABLE_SIZE 256 |
| | | |
| | | class MPEG2TransportStreamMultiplexor: public FramedSource { |
| | | public: |
| | | Boolean canDeliverNewFrameImmediately() const { return fInputBufferBytesUsed < fInputBufferSize; } |
| | | // Can be used by a downstream reader to test whether the next call to "doGetNextFrame()" |
| | | // will deliver data immediately). |
| | | |
| | | protected: |
| | | MPEG2TransportStreamMultiplexor(UsageEnvironment& env); |
| | | virtual ~MPEG2TransportStreamMultiplexor(); |
| | | |
| | | virtual void awaitNewBuffer(unsigned char* oldBuffer) = 0; |
| | | // implemented by subclasses |
| | | |
| | | void handleNewBuffer(unsigned char* buffer, unsigned bufferSize, |
| | | int mpegVersion, MPEG1or2Demux::SCR scr, int16_t PID = -1); |
| | | // called by "awaitNewBuffer()" |
| | | // Note: For MPEG-4 video, set "mpegVersion" to 4; for H.264 video, set "mpegVersion" to 5. |
| | | // The buffer is assumed to be a PES packet, with a proper PES header. |
| | | // If "PID" is not -1, then it (currently, only the low 8 bits) is used as the stream's PID, |
| | | // otherwise the "stream_id" in the PES header is reused to be the stream's PID. |
| | | |
| | | private: |
| | | // Redefined virtual functions: |
| | | virtual void doGetNextFrame(); |
| | | |
| | | private: |
| | | void deliverDataToClient(u_int8_t pid, unsigned char* buffer, unsigned bufferSize, |
| | | unsigned& startPositionInBuffer); |
| | | |
| | | void deliverPATPacket(); |
| | | void deliverPMTPacket(Boolean hasChanged); |
| | | |
| | | void setProgramStreamMap(unsigned frameSize); |
| | | |
| | | protected: |
| | | Boolean fHaveVideoStreams; |
| | | |
| | | private: |
| | | unsigned fOutgoingPacketCounter; |
| | | unsigned fProgramMapVersion; |
| | | u_int8_t fPreviousInputProgramMapVersion, fCurrentInputProgramMapVersion; |
| | | // These two fields are used if we see "program_stream_map"s in the input. |
| | | struct { |
| | | unsigned counter; |
| | | u_int8_t streamType; // for use in Program Maps |
| | | } fPIDState[PID_TABLE_SIZE]; |
| | | u_int8_t fPCR_PID, fCurrentPID; |
| | | // Note: We map 8-bit stream_ids directly to PIDs |
| | | MPEG1or2Demux::SCR fPCR; |
| | | unsigned char* fInputBuffer; |
| | | unsigned fInputBufferSize, fInputBufferBytesUsed; |
| | | Boolean fIsFirstAdaptationField; |
| | | }; |
| | | |
| | | |
| | | // The CRC calculation function that Transport Streams use. We make this function public |
| | | // here in case it's useful elsewhere: |
| | | u_int32_t calculateCRC(u_int8_t const* data, unsigned dataLength, u_int32_t initialValue = 0xFFFFFFFF); |
| | | |
| | | #endif |