MythTV: MPEG1or2AudioRTPSource.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 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00015 **********/
00016 // "liveMedia"
00017 // Copyright (c) 1996-2005 Live Networks, Inc.  All rights reserved.
00018 // MPEG-1 or MPEG-2 Audio RTP Sources
00019 // Implementation
00020 
00021 #include "MPEG1or2AudioRTPSource.hh"
00022 
00023 MPEG1or2AudioRTPSource*
00024 MPEG1or2AudioRTPSource::createNew(UsageEnvironment& env,
00025                               Groupsock* RTPgs,
00026                               unsigned char rtpPayloadFormat,
00027                               unsigned rtpTimestampFrequency) {
00028   return new MPEG1or2AudioRTPSource(env, RTPgs, rtpPayloadFormat,
00029                                 rtpTimestampFrequency);
00030 }
00031 
00032 MPEG1or2AudioRTPSource::MPEG1or2AudioRTPSource(UsageEnvironment& env,
00033                                        Groupsock* rtpGS,
00034                                        unsigned char rtpPayloadFormat,
00035                                        unsigned rtpTimestampFrequency)
00036   : MultiFramedRTPSource(env, rtpGS,
00037                          rtpPayloadFormat, rtpTimestampFrequency) {
00038 }
00039 
00040 MPEG1or2AudioRTPSource::~MPEG1or2AudioRTPSource() {
00041 }
00042 
00043 Boolean MPEG1or2AudioRTPSource
00044 ::processSpecialHeader(BufferedPacket* packet,
00045                        unsigned& resultSpecialHeaderSize) {
00046   // There's a 4-byte header indicating fragmentation.
00047   if (packet->dataSize() < 4) return False;
00048 
00049   // Note: This fragmentation header is actually useless to us, because
00050   // it doesn't tell us whether or not this RTP packet *ends* a
00051   // fragmented frame.  Thus, we can't use it to properly set
00052   // "fCurrentPacketCompletesFrame".  Instead, we assume that even
00053   // a partial audio frame will be usable to clients.
00054 
00055   resultSpecialHeaderSize = 4;
00056   return True;
00057 }    
00058 
00059 char const* MPEG1or2AudioRTPSource::MIMEtype() const {
00060   return "audio/MPEG";
00061 }
00062