MPEG4LATMAudioRTPSink.hh

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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
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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.,
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// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// RTP sink for MPEG-4 audio, using LATM multiplexing (RFC 3016)
// (Note that the initial 'size' field is assumed to be present at the start of
//  each frame.)
// C++ header
 
#ifndef _MPEG4_LATM_AUDIO_RTP_SINK_HH
#define _MPEG4_LATM_AUDIO_RTP_SINK_HH
 
#ifndef _AUDIO_RTP_SINK_HH
#include "AudioRTPSink.hh"
#endif
 
class MPEG4LATMAudioRTPSink: public AudioRTPSink {
public:
  static MPEG4LATMAudioRTPSink* createNew(UsageEnvironment& env,
                                          Groupsock* RTPgs,
                                          unsigned char rtpPayloadFormat,
                                          u_int32_t rtpTimestampFrequency,
                                          char const* streamMuxConfigString,
                                          unsigned numChannels,
                                          Boolean allowMultipleFramesPerPacket = False);
 
protected:
  MPEG4LATMAudioRTPSink(UsageEnvironment& env, Groupsock* RTPgs,
                        unsigned char rtpPayloadFormat,
                        u_int32_t rtpTimestampFrequency,
                        char const* streamMuxConfigString,
                        unsigned numChannels,
                        Boolean allowMultipleFramesPerPacket);
        // called only by createNew()
 
  virtual ~MPEG4LATMAudioRTPSink();
 
private: // redefined virtual functions:
  virtual void doSpecialFrameHandling(unsigned fragmentationOffset,
                                      unsigned char* frameStart,
                                      unsigned numBytesInFrame,
                                      struct timeval framePresentationTime,
                                      unsigned numRemainingBytes);
  virtual Boolean
  frameCanAppearAfterPacketStart(unsigned char const* frameStart,
                                 unsigned numBytesInFrame) const;
 
  virtual char const* auxSDPLine(); // for the "a=fmtp:" SDP line
 
private:
  char const* fStreamMuxConfigString;
  char* fFmtpSDPLine;
  Boolean fAllowMultipleFramesPerPacket;
};
 
#endif