mpeg1or2videofileservermediasubsession.cpp

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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FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
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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 a MPEG-1 or 2 Elementary Stream video file.
// Implementation

#include "MPEG1or2VideoFileServerMediaSubsession.hh"
#include "MPEG1or2VideoRTPSink.hh"
#include "ByteStreamFileSource.hh"
#include "MPEG1or2VideoStreamFramer.hh"

MPEG1or2VideoFileServerMediaSubsession*
MPEG1or2VideoFileServerMediaSubsession::createNew(UsageEnvironment& env,
						  char const* fileName,
						  Boolean reuseFirstSource,
						  Boolean iFramesOnly,
						  double vshPeriod) {
  return new MPEG1or2VideoFileServerMediaSubsession(env, fileName, reuseFirstSource,
						    iFramesOnly, vshPeriod);
}

MPEG1or2VideoFileServerMediaSubsession
::MPEG1or2VideoFileServerMediaSubsession(UsageEnvironment& env,
					 char const* fileName,
					 Boolean reuseFirstSource,
					 Boolean iFramesOnly,
					 double vshPeriod)
  : FileServerMediaSubsession(env, fileName, reuseFirstSource),
    fIFramesOnly(iFramesOnly), fVSHPeriod(vshPeriod) {
}

MPEG1or2VideoFileServerMediaSubsession
::~MPEG1or2VideoFileServerMediaSubsession() {
}

FramedSource* MPEG1or2VideoFileServerMediaSubsession
::createNewStreamSource(unsigned /*clientSessionId*/, unsigned& estBitrate) {
  estBitrate = 500; // kbps, estimate

  ByteStreamFileSource* fileSource
    = ByteStreamFileSource::createNew(envir(), fFileName);
  if (fileSource == NULL) return NULL;
  fFileSize = fileSource->fileSize();

  return MPEG1or2VideoStreamFramer
    ::createNew(envir(), fileSource, fIFramesOnly, fVSHPeriod);
}

RTPSink* MPEG1or2VideoFileServerMediaSubsession
::createNewRTPSink(Groupsock* rtpGroupsock,
		   unsigned char /*rtpPayloadTypeIfDynamic*/,
		   FramedSource* /*inputSource*/) {
  return MPEG1or2VideoRTPSink::createNew(envir(), rtpGroupsock);
}