1/**********
2This library is free software; you can redistribute it and/or modify it under
3the terms of the GNU Lesser General Public License as published by the
4Free Software Foundation; either version 3 of the License, or (at your
5option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
6
7This library is distributed in the hope that it will be useful, but WITHOUT
8ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
9FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
10more details.
11
12You should have received a copy of the GNU Lesser General Public License
13along with this library; if not, write to the Free Software Foundation, Inc.,
1451 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15**********/
16// "liveMedia"
17// Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved.
18// RTP sink for MPEG video (RFC 2250)
19// C++ header
20
21#ifndef _MPEG_1OR2_VIDEO_RTP_SINK_HH
22#define _MPEG_1OR2_VIDEO_RTP_SINK_HH
23
24#ifndef _VIDEO_RTP_SINK_HH
25#include "VideoRTPSink.hh"
26#endif
27
28class MPEG1or2VideoRTPSink: public VideoRTPSink {
29public:
30 static MPEG1or2VideoRTPSink* createNew(UsageEnvironment& env, Groupsock* RTPgs);
31
32protected:
33 MPEG1or2VideoRTPSink(UsageEnvironment& env, Groupsock* RTPgs);
34 // called only by createNew()
35
36 virtual ~MPEG1or2VideoRTPSink();
37
38private: // redefined virtual functions:
39 virtual Boolean sourceIsCompatibleWithUs(MediaSource& source);
40
41 virtual void doSpecialFrameHandling(unsigned fragmentationOffset,
42 unsigned char* frameStart,
43 unsigned numBytesInFrame,
44 struct timeval framePresentationTime,
45 unsigned numRemainingBytes);
46 virtual Boolean allowFragmentationAfterStart() const;
47 virtual
48 Boolean frameCanAppearAfterPacketStart(unsigned char const* frameStart,
49 unsigned numBytesInFrame) const;
50 virtual unsigned specialHeaderSize() const;
51
52private:
53 // MPEG video-specific state, used to decide how to fill out the
54 // video-specific header, and when to include multiple 'frames' in a
55 // single outgoing RTP packet. Eventually we should somehow get this
56 // state from the source (MPEG1or2VideoStreamFramer) instead, as the source
57 // already has this info itself.
58 struct {
59 unsigned temporal_reference;
60 unsigned char picture_coding_type;
61 unsigned char vector_code_bits; // FBV,BFC,FFV,FFC from RFC 2250, sec. 3.4
62 } fPictureState;
63 Boolean fPreviousFrameWasSlice;
64 // used to implement frameCanAppearAfterPacketStart()
65 Boolean fSequenceHeaderPresent;
66 Boolean fPacketBeginsSlice, fPacketEndsSlice;
67};
68
69#endif
70