wavaudiofileservermediasubsession.hh

流媒体传输协议的实现代码,非常有用.可以支持rtsp mms等流媒体传输协议

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// "liveMedia"
// Copyright (c) 1996-2004 Live Networks, Inc.  All rights reserved.
// A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
// on demand, from an WAV audio file.
// C++ header

#ifndef _WAV_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH
#define _WAV_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH

#ifndef _FILE_SERVER_MEDIA_SUBSESSION_HH
#include "FileServerMediaSubsession.hh"
#endif

class WAVAudioFileServerMediaSubsession: public FileServerMediaSubsession{
public:
  static WAVAudioFileServerMediaSubsession*
  createNew(UsageEnvironment& env, char const* fileName, Boolean reuseFirstSource,
	    Boolean convertToULaw = False);
      // If "convertToULaw" is True, 16-bit audio streams are converted to
      // 8-bit u-law audio prior to streaming.

private:
  WAVAudioFileServerMediaSubsession(UsageEnvironment& env, char const* fileName,
				    Boolean reuseFirstSource, Boolean convertToULaw);
      // called only by createNew();
  virtual ~WAVAudioFileServerMediaSubsession();

private: // redefined virtual functions
  virtual void seekStreamSource(FramedSource* inputSource, float seekNPT);
  virtual void setStreamSourceScale(FramedSource* inputSource, float scale);
  virtual FramedSource* createNewStreamSource(unsigned clientSessionId,
					      unsigned& estBitrate);
  virtual RTPSink* createNewRTPSink(Groupsock* rtpGroupsock,
                                    unsigned char rtpPayloadTypeIfDynamic,
				    FramedSource* inputSource);
  virtual void testScaleFactor(float& scale);
  virtual float duration() const;

private:
  Boolean fConvertToULaw;

  // The following parameters of the input stream are set after
  // "createNewStreamSource" is called:
  unsigned char fBitsPerSample;
  unsigned fSamplingFrequency;
  unsigned fNumChannels;
  float fFileDuration;
};

#endif