/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved.
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// A class for generating MPEG-2 Transport Stream from one or more input
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// Elementary Stream data sources
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// C++ header
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#ifndef _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH
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#define _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH
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#ifndef _FRAMED_SOURCE_HH
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#include "FramedSource.hh"
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#endif
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#ifndef _MPEG_1OR2_DEMUX_HH
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#include "MPEG1or2Demux.hh" // for SCR
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#endif
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#define PID_TABLE_SIZE 256
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class MPEG2TransportStreamMultiplexor: public FramedSource {
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public:
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Boolean canDeliverNewFrameImmediately() const { return fInputBufferBytesUsed < fInputBufferSize; }
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// Can be used by a downstream reader to test whether the next call to "doGetNextFrame()"
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// will deliver data immediately).
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protected:
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MPEG2TransportStreamMultiplexor(UsageEnvironment& env);
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virtual ~MPEG2TransportStreamMultiplexor();
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virtual void awaitNewBuffer(unsigned char* oldBuffer) = 0;
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// implemented by subclasses
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void handleNewBuffer(unsigned char* buffer, unsigned bufferSize,
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int mpegVersion, MPEG1or2Demux::SCR scr, int16_t PID = -1);
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// called by "awaitNewBuffer()"
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// Note: For MPEG-4 video, set "mpegVersion" to 4; for H.264 video, set "mpegVersion" to 5;
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// for H.265 video, set "mpegVersion" to 6.
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// For Opus audio, set "mpegVersion" to 3.
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// The buffer is assumed to be a PES packet, with a proper PES header.
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// If "PID" is not -1, then it (currently, only the low 8 bits) is used as the stream's PID,
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// otherwise the "stream_id" in the PES header is reused to be the stream's PID.
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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void deliverDataToClient(u_int8_t pid, unsigned char* buffer, unsigned bufferSize,
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unsigned& startPositionInBuffer);
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void deliverPATPacket();
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void deliverPMTPacket(Boolean hasChanged);
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void setProgramStreamMap(unsigned frameSize);
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protected:
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Boolean fHaveVideoStreams;
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private:
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unsigned fOutgoingPacketCounter;
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unsigned fProgramMapVersion;
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u_int8_t fPreviousInputProgramMapVersion, fCurrentInputProgramMapVersion;
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// These two fields are used if we see "program_stream_map"s in the input.
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struct {
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unsigned counter;
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u_int8_t streamType; // for use in Program Maps
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} fPIDState[PID_TABLE_SIZE];
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u_int8_t fPCR_PID, fCurrentPID;
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// Note: We map 8-bit stream_ids directly to PIDs
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MPEG1or2Demux::SCR fPCR;
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unsigned char* fInputBuffer;
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unsigned fInputBufferSize, fInputBufferBytesUsed;
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Boolean fIsFirstAdaptationField;
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};
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// The CRC calculation function that Transport Streams use. We make this function public
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// here in case it's useful elsewhere:
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u_int32_t calculateCRC(u_int8_t const* data, unsigned dataLength, u_int32_t initialValue = 0xFFFFFFFF);
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#endif
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