live: liveMedia/include/WAVAudioFileServerMediaSubsession.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) 1996-2012 Live Networks, Inc.  All rights reserved.
00018 // A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
00019 // on demand, from an WAV audio file.
00020 // C++ header
00021 
00022 #ifndef _WAV_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH
00023 #define _WAV_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH
00024 
00025 #ifndef _FILE_SERVER_MEDIA_SUBSESSION_HH
00026 #include "FileServerMediaSubsession.hh"
00027 #endif
00028 
00029 class WAVAudioFileServerMediaSubsession: public FileServerMediaSubsession{
00030 public:
00031   static WAVAudioFileServerMediaSubsession*
00032   createNew(UsageEnvironment& env, char const* fileName, Boolean reuseFirstSource,
00033             Boolean convertToULaw = False);
00034       // If "convertToULaw" is True, 16-bit audio streams are converted to
00035       // 8-bit u-law audio prior to streaming.
00036 
00037 protected:
00038   WAVAudioFileServerMediaSubsession(UsageEnvironment& env, char const* fileName,
00039                                     Boolean reuseFirstSource, Boolean convertToULaw);
00040       // called only by createNew();
00041   virtual ~WAVAudioFileServerMediaSubsession();
00042 
00043 protected: // redefined virtual functions
00044   virtual void seekStreamSource(FramedSource* inputSource, double& seekNPT, double streamDuration, u_int64_t& numBytes);
00045   virtual void setStreamSourceScale(FramedSource* inputSource, float scale);
00046   virtual FramedSource* createNewStreamSource(unsigned clientSessionId,
00047                                               unsigned& estBitrate);
00048   virtual RTPSink* createNewRTPSink(Groupsock* rtpGroupsock,
00049                                     unsigned char rtpPayloadTypeIfDynamic,
00050                                     FramedSource* inputSource);
00051   virtual void testScaleFactor(float& scale);
00052   virtual float duration() const;
00053 
00054 protected:
00055   Boolean fConvertToULaw;
00056 
00057   // The following parameters of the input stream are set after
00058   // "createNewStreamSource" is called:
00059   unsigned char fAudioFormat;
00060   unsigned char fBitsPerSample;
00061   unsigned fSamplingFrequency;
00062   unsigned fNumChannels;
00063   float fFileDuration;
00064 };
00065 
00066 #endif