live: liveMedia/AC3AudioMatroskaFileServerMediaSubsession.cpp 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) 1996-2012 Live Networks, Inc.  All rights reserved.
00018 // A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
00019 // on demand, from an AC3 audio track within a Matroska file.
00020 // Implementation
00021 
00022 #include "AC3AudioMatroskaFileServerMediaSubsession.hh"
00023 #include "AC3AudioRTPSink.hh"
00024 #include "MatroskaDemuxedTrack.hh"
00025 
00026 AC3AudioMatroskaFileServerMediaSubsession* AC3AudioMatroskaFileServerMediaSubsession
00027 ::createNew(MatroskaFileServerDemux& demux, unsigned trackNumber) {
00028   return new AC3AudioMatroskaFileServerMediaSubsession(demux, trackNumber);
00029 }
00030 
00031 AC3AudioMatroskaFileServerMediaSubsession
00032 ::AC3AudioMatroskaFileServerMediaSubsession(MatroskaFileServerDemux& demux, unsigned trackNumber)
00033   : FileServerMediaSubsession(demux.envir(), demux.fileName(), False),
00034     fOurDemux(demux), fTrackNumber(trackNumber) {
00035 }
00036 
00037 AC3AudioMatroskaFileServerMediaSubsession
00038 ::~AC3AudioMatroskaFileServerMediaSubsession() {
00039 }
00040 
00041 float AC3AudioMatroskaFileServerMediaSubsession::duration() const { return fOurDemux.fileDuration(); }
00042 
00043 void AC3AudioMatroskaFileServerMediaSubsession
00044 ::seekStreamSource(FramedSource* inputSource, double& seekNPT, double /*streamDuration*/, u_int64_t& /*numBytes*/) {
00045   ((MatroskaDemuxedTrack*)inputSource)->seekToTime(seekNPT);
00046 }
00047 
00048 FramedSource* AC3AudioMatroskaFileServerMediaSubsession
00049 ::createNewStreamSource(unsigned clientSessionId, unsigned& estBitrate) {
00050   estBitrate = 48; // kbps, estimate
00051 
00052   return fOurDemux.newDemuxedTrack(clientSessionId, fTrackNumber);
00053 }
00054 
00055 RTPSink* AC3AudioMatroskaFileServerMediaSubsession
00056 ::createNewRTPSink(Groupsock* rtpGroupsock, unsigned char rtpPayloadTypeIfDynamic, FramedSource* /*inputSource*/) {
00057   MatroskaTrack* track = fOurDemux.lookup(fTrackNumber);
00058   return AC3AudioRTPSink::createNew(envir(), rtpGroupsock, rtpPayloadTypeIfDynamic, track->samplingFrequency);
00059 }