AC3AudioRTPSource.cpp 2.2 KB
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/**********
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
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Free Software Foundation; either version 3 of the License, or (at your
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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.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
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**********/
// "liveMedia"
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// Copyright (c) 1996-2019 Live Networks, Inc.  All rights reserved.
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// AC3 Audio RTP Sources
// Implementation

#include "AC3AudioRTPSource.hh"

AC3AudioRTPSource*
AC3AudioRTPSource::createNew(UsageEnvironment& env,
			      Groupsock* RTPgs,
			      unsigned char rtpPayloadFormat,
			      unsigned rtpTimestampFrequency) {
  return new AC3AudioRTPSource(env, RTPgs, rtpPayloadFormat,
				rtpTimestampFrequency);
}

AC3AudioRTPSource::AC3AudioRTPSource(UsageEnvironment& env,
				       Groupsock* rtpGS,
				       unsigned char rtpPayloadFormat,
				       unsigned rtpTimestampFrequency)
  : MultiFramedRTPSource(env, rtpGS,
			 rtpPayloadFormat, rtpTimestampFrequency) {
}

AC3AudioRTPSource::~AC3AudioRTPSource() {
}

Boolean AC3AudioRTPSource
::processSpecialHeader(BufferedPacket* packet,
		       unsigned& resultSpecialHeaderSize) {
  unsigned char* headerStart = packet->data();
  unsigned packetSize = packet->dataSize();

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  // There's a 2-byte payload header at the beginning:
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  if (packetSize < 2) return False;
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  resultSpecialHeaderSize = 2;
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  unsigned char FT = headerStart[0]&0x03;
  fCurrentPacketBeginsFrame = FT != 3;
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  // The RTP "M" (marker) bit indicates the last fragment of a frame.
  // In case the sender did not set the "M" bit correctly, we also test for FT == 0:
  fCurrentPacketCompletesFrame = packet->rtpMarkerBit() || FT == 0;
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  return True;
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}
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char const* AC3AudioRTPSource::MIMEtype() const {
  return "audio/AC3";
}