live: liveMedia/include/MPEG4LATMAudioRTPSink.hh Source File

00001 /**********
00002 This library is free software; you can redistribute it and/or modify it under
00003 the terms of the GNU Lesser General Public License as published by the
00004 Free Software Foundation; either version 2.1 of the License, or (at your
00005 option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
00006 
00007 This library is distributed in the hope that it will be useful, but WITHOUT
00008 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00009 FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
00010 more details.
00011 
00012 You should have received a copy of the GNU Lesser General Public License
00013 along with this library; if not, write to the Free Software Foundation, Inc.,
00014 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
00015 **********/
00016 // "liveMedia"
00017 // Copyright (c) 1996-2008 Live Networks, Inc.  All rights reserved.
00018 // RTP sink for MPEG-4 audio, using LATM multiplexing (RFC 3016)
00019 // (Note that the initial 'size' field is assumed to be present at the start of
00020 //  each frame.)
00021 // C++ header
00022 
00023 #ifndef _MPEG4_LATM_AUDIO_RTP_SINK_HH
00024 #define _MPEG4_LATM_AUDIO_RTP_SINK_HH
00025 
00026 #ifndef _AUDIO_RTP_SINK_HH
00027 #include "AudioRTPSink.hh"
00028 #endif
00029 
00030 class MPEG4LATMAudioRTPSink: public AudioRTPSink {
00031 public:
00032   static MPEG4LATMAudioRTPSink* createNew(UsageEnvironment& env,
00033                                           Groupsock* RTPgs,
00034                                           unsigned char rtpPayloadFormat,
00035                                           u_int32_t rtpTimestampFrequency,
00036                                           char const* streamMuxConfigString,
00037                                           unsigned numChannels,
00038                                           Boolean allowMultipleFramesPerPacket = False);
00039 
00040 protected:
00041   MPEG4LATMAudioRTPSink(UsageEnvironment& env, Groupsock* RTPgs,
00042                         unsigned char rtpPayloadFormat,
00043                         u_int32_t rtpTimestampFrequency,
00044                         char const* streamMuxConfigString,
00045                         unsigned numChannels,
00046                         Boolean allowMultipleFramesPerPacket);
00047         // called only by createNew()
00048 
00049   virtual ~MPEG4LATMAudioRTPSink();
00050 
00051 private: // redefined virtual functions:
00052   virtual void doSpecialFrameHandling(unsigned fragmentationOffset,
00053                                       unsigned char* frameStart,
00054                                       unsigned numBytesInFrame,
00055                                       struct timeval frameTimestamp,
00056                                       unsigned numRemainingBytes);
00057   virtual Boolean
00058   frameCanAppearAfterPacketStart(unsigned char const* frameStart,
00059                                  unsigned numBytesInFrame) const;
00060 
00061   virtual char const* auxSDPLine(); // for the "a=fmtp:" SDP line
00062 
00063 private:
00064   char const* fStreamMuxConfigString;
00065   char* fFmtpSDPLine;
00066   Boolean fAllowMultipleFramesPerPacket;
00067 };
00068 
00069 #endif