liveMedia/MatroskaFileServerMediaSubsession.cpp

/**********
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
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You should have received a copy of the GNU Lesser General Public License
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**********/
// "liveMedia"
// Copyright (c) 1996-2020 Live Networks, Inc.  All rights reserved.
// A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
// on demand, from a track within a Matroska file.
// Implementation

#include "MatroskaFileServerMediaSubsession.hh"
#include "MatroskaDemuxedTrack.hh"
#include "FramedFilter.hh"

MatroskaFileServerMediaSubsession* MatroskaFileServerMediaSubsession
::createNew(MatroskaFileServerDemux& demux, MatroskaTrack* track) {
  return new MatroskaFileServerMediaSubsession(demux, track);
}

MatroskaFileServerMediaSubsession
::MatroskaFileServerMediaSubsession(MatroskaFileServerDemux& demux, MatroskaTrack* track)
  : FileServerMediaSubsession(demux.envir(), demux.fileName(), False),
    fOurDemux(demux), fTrack(track), fNumFiltersInFrontOfTrack(0) {
}

MatroskaFileServerMediaSubsession::~MatroskaFileServerMediaSubsession() {
}

float MatroskaFileServerMediaSubsession::duration() const { return fOurDemux.fileDuration(); }

void MatroskaFileServerMediaSubsession
::seekStreamSource(FramedSource* inputSource, double& seekNPT, double /*streamDuration*/, u_int64_t& /*numBytes*/) {
  for (unsigned i = 0; i < fNumFiltersInFrontOfTrack; ++i) {
    // "inputSource" is a filter.  Go back to *its* source:
    inputSource = ((FramedFilter*)inputSource)->inputSource();
  }
  ((MatroskaDemuxedTrack*)inputSource)->seekToTime(seekNPT);
}

FramedSource* MatroskaFileServerMediaSubsession
::createNewStreamSource(unsigned clientSessionId, unsigned& estBitrate) {
  FramedSource* baseSource = fOurDemux.newDemuxedTrack(clientSessionId, fTrack->trackNumber);
  if (baseSource == NULL) return NULL;
  
  return fOurDemux.ourMatroskaFile()
    ->createSourceForStreaming(baseSource, fTrack->trackNumber,
			       estBitrate, fNumFiltersInFrontOfTrack);
}

RTPSink* MatroskaFileServerMediaSubsession
::createNewRTPSink(Groupsock* rtpGroupsock, unsigned char rtpPayloadTypeIfDynamic, FramedSource* /*inputSource*/) {
  return fOurDemux.ourMatroskaFile()
    ->createRTPSinkForTrackNumber(fTrack->trackNumber, rtpGroupsock, rtpPayloadTypeIfDynamic);
}