64 lines
2.3 KiB
C++
Executable File
64 lines
2.3 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
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// RTP sink for MPEG audio (RFC 2250)
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// Implementation
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#include "MPEG1or2AudioRTPSink.hh"
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MPEG1or2AudioRTPSink::MPEG1or2AudioRTPSink(UsageEnvironment& env, Groupsock* RTPgs)
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: AudioRTPSink(env, RTPgs, 14, 90000, "MPA") {
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}
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MPEG1or2AudioRTPSink::~MPEG1or2AudioRTPSink() {
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}
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MPEG1or2AudioRTPSink*
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MPEG1or2AudioRTPSink::createNew(UsageEnvironment& env, Groupsock* RTPgs) {
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return new MPEG1or2AudioRTPSink(env, RTPgs);
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}
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void MPEG1or2AudioRTPSink::doSpecialFrameHandling(unsigned fragmentationOffset,
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unsigned char* frameStart,
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unsigned numBytesInFrame,
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struct timeval framePresentationTime,
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unsigned numRemainingBytes) {
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// If this is the 1st frame in the 1st packet, set the RTP 'M' (marker)
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// bit (because this is considered the start of a talk spurt):
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if (isFirstPacket() && isFirstFrameInPacket()) {
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setMarkerBit();
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}
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// If this is the first frame in the packet, set the lower half of the
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// audio-specific header (to the "fragmentationOffset"):
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if (isFirstFrameInPacket()) {
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setSpecialHeaderWord(fragmentationOffset&0xFFFF);
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}
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// Important: Also call our base class's doSpecialFrameHandling(),
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// to set the packet's timestamp:
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MultiFramedRTPSink::doSpecialFrameHandling(fragmentationOffset,
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frameStart, numBytesInFrame,
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framePresentationTime,
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numRemainingBytes);
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}
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unsigned MPEG1or2AudioRTPSink::specialHeaderSize() const {
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// There's a 4 byte special audio header:
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return 4;
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}
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