/**********
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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 3 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) 1996-2017 Live Networks, Inc. All rights reserved.
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// RTP sink for MPEG video (RFC 2250)
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// C++ header
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#ifndef _MPEG_1OR2_VIDEO_RTP_SINK_HH
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#define _MPEG_1OR2_VIDEO_RTP_SINK_HH
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#ifndef _VIDEO_RTP_SINK_HH
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#include "VideoRTPSink.hh"
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#endif
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class MPEG1or2VideoRTPSink: public VideoRTPSink {
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public:
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static MPEG1or2VideoRTPSink* createNew(UsageEnvironment& env, Groupsock* RTPgs);
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protected:
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MPEG1or2VideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs);
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// called only by createNew()
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virtual ~MPEG1or2VideoRTPSink();
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private: // redefined virtual functions:
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virtual Boolean sourceIsCompatibleWithUs(MediaSource& source);
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virtual void 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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virtual Boolean allowFragmentationAfterStart() const;
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virtual
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Boolean frameCanAppearAfterPacketStart(unsigned char const* frameStart,
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unsigned numBytesInFrame) const;
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virtual unsigned specialHeaderSize() const;
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private:
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// MPEG video-specific state, used to decide how to fill out the
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// video-specific header, and when to include multiple 'frames' in a
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// single outgoing RTP packet. Eventually we should somehow get this
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// state from the source (MPEG1or2VideoStreamFramer) instead, as the source
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// already has this info itself.
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struct {
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unsigned temporal_reference;
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unsigned char picture_coding_type;
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unsigned char vector_code_bits; // FBV,BFC,FFV,FFC from RFC 2250, sec. 3.4
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} fPictureState;
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Boolean fPreviousFrameWasSlice;
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// used to implement frameCanAppearAfterPacketStart()
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Boolean fSequenceHeaderPresent;
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Boolean fPacketBeginsSlice, fPacketEndsSlice;
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};
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#endif
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