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// A simplified version of "MPEG4VideoStreamFramer" that takes only complete,
19// discrete frames (rather than an arbitrary byte stream) as input.
20// This avoids the parsing and data copying overhead of the full
21// "MPEG4VideoStreamFramer".
22// C++ header
23
24#ifndef _MPEG4_VIDEO_STREAM_DISCRETE_FRAMER_HH
25#define _MPEG4_VIDEO_STREAM_DISCRETE_FRAMER_HH
26
27#ifndef _MPEG4_VIDEO_STREAM_FRAMER_HH
28#include "MPEG4VideoStreamFramer.hh"
29#endif
30
31class MPEG4VideoStreamDiscreteFramer: public MPEG4VideoStreamFramer {
32public:
33 static MPEG4VideoStreamDiscreteFramer*
34 createNew(UsageEnvironment& env, FramedSource* inputSource, Boolean leavePresentationTimesUnmodified = False);
35
36protected:
37 MPEG4VideoStreamDiscreteFramer(UsageEnvironment& env,
38 FramedSource* inputSource, Boolean leavePresentationTimesUnmodified);
39 // called only by createNew()
40 virtual ~MPEG4VideoStreamDiscreteFramer();
41
42protected:
43 // redefined virtual functions:
44 virtual void doGetNextFrame();
45
46protected:
47 static void afterGettingFrame(void* clientData, unsigned frameSize,
48 unsigned numTruncatedBytes,
49 struct timeval presentationTime,
50 unsigned durationInMicroseconds);
51 void afterGettingFrame1(unsigned frameSize,
52 unsigned numTruncatedBytes,
53 struct timeval presentationTime,
54 unsigned durationInMicroseconds);
55
56 Boolean getNextFrameBit(u_int8_t& result);
57 Boolean getNextFrameBits(unsigned numBits, u_int32_t& result);
58 // Which are used by:
59 void analyzeVOLHeader();
60
61protected:
62 Boolean fLeavePresentationTimesUnmodified;
63 u_int32_t vop_time_increment_resolution;
64 unsigned fNumVTIRBits;
65 // # of bits needed to count to "vop_time_increment_resolution"
66 struct timeval fLastNonBFramePresentationTime;
67 unsigned fLastNonBFrameVop_time_increment;
68
69private:
70 unsigned fNumBitsSeenSoFar; // used by the getNextFrameBit*() routines
71};
72
73#endif
74