| /********** |
| 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 |
| Free Software Foundation; either version 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| 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 |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // RTP source for 'ADUized' MP3 frames ("mpa-robust") |
| // Implementation |
| |
| #include "MP3ADURTPSource.hh" |
| #include "MP3ADUdescriptor.hh" |
| |
| ////////// ADUBufferedPacket and ADUBufferedPacketFactory ////////// |
| |
| class ADUBufferedPacket: public BufferedPacket { |
| private: // redefined virtual functions |
| virtual unsigned nextEnclosedFrameSize(unsigned char*& framePtr, |
| unsigned dataSize); |
| }; |
| |
| class ADUBufferedPacketFactory: public BufferedPacketFactory { |
| private: // redefined virtual functions |
| virtual BufferedPacket* createNewPacket(MultiFramedRTPSource* ourSource); |
| }; |
| |
| ///////// MP3ADURTPSource implementation //////// |
| |
| MP3ADURTPSource* |
| MP3ADURTPSource::createNew(UsageEnvironment& env, Groupsock* RTPgs, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) { |
| return new MP3ADURTPSource(env, RTPgs, rtpPayloadFormat, |
| rtpTimestampFrequency); |
| } |
| |
| MP3ADURTPSource::MP3ADURTPSource(UsageEnvironment& env, Groupsock* RTPgs, |
| unsigned char rtpPayloadFormat, |
| unsigned rtpTimestampFrequency) |
| : MultiFramedRTPSource(env, RTPgs, |
| rtpPayloadFormat, rtpTimestampFrequency, |
| new ADUBufferedPacketFactory) { |
| } |
| |
| MP3ADURTPSource::~MP3ADURTPSource() { |
| } |
| |
| char const* MP3ADURTPSource::MIMEtype() const { |
| return "audio/MPA-ROBUST"; |
| } |
| |
| ////////// ADUBufferedPacket and ADUBufferredPacketFactory implementation |
| |
| unsigned ADUBufferedPacket |
| ::nextEnclosedFrameSize(unsigned char*& framePtr, unsigned dataSize) { |
| // Return the size of the next MP3 'ADU', on the assumption that |
| // the input data is ADU-encoded MP3 frames. |
| unsigned char* frameDataPtr = framePtr; |
| unsigned remainingFrameSize |
| = ADUdescriptor::getRemainingFrameSize(frameDataPtr); |
| unsigned descriptorSize = (unsigned)(frameDataPtr - framePtr); |
| unsigned fullADUSize = descriptorSize + remainingFrameSize; |
| |
| return (fullADUSize <= dataSize) ? fullADUSize : dataSize; |
| } |
| |
| BufferedPacket* ADUBufferedPacketFactory |
| ::createNewPacket(MultiFramedRTPSource* /*ourSource*/) { |
| return new ADUBufferedPacket; |
| } |