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MPEG2TransportStreamMultiplexor.hh
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9FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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15**********/
16// "liveMedia"
17// Copyright (c) 1996-2024 Live Networks, Inc. All rights reserved.
18// A class for generating MPEG-2 Transport Stream from one or more input
19// Elementary Stream data sources
20// C++ header
21
22#ifndef _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH
23#define _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH
24
25#ifndef _FRAMED_SOURCE_HH
26#include "FramedSource.hh"
27#endif
28#ifndef _MPEG_1OR2_DEMUX_HH
29#include "MPEG1or2Demux.hh" // for SCR
30#endif
31
32#define PID_TABLE_SIZE 0x2000 // 2^13
33
35public:
36 typedef void (onEndOfSegmentFunc)(void* clientData, double segmentDuration);
37 void setTimedSegmentation(unsigned segmentationDuration,
39 void* onEndOfSegmentClientData = NULL);
40 // Specifies that PAT and PMT packets should be output every "segmentationDuration" seconds.
41 // (If "segmentationDuration" is 0 (the default value), then PAT and PMT packets are output
42 // at a preset frequency.)
43 // The optional function "onEndOfSegmentFunc" is called after each segment is output.
45 // Valid only if "setTimedSegmentation()" was previously called with "segmentationDuration" > 0
46
48 // Can be used by a downstream reader to test whether the next call to "doGetNextFrame()"
49 // will deliver data immediately).
50
51protected:
54
55 virtual void awaitNewBuffer(unsigned char* oldBuffer) = 0;
56 // implemented by subclasses
57
58 void handleNewBuffer(unsigned char* buffer, unsigned bufferSize,
59 int mpegVersion, MPEG1or2Demux::SCR scr, int16_t PID = -1);
60 // called by "awaitNewBuffer()"
61 // Note: For MPEG-4 video, set "mpegVersion" to 4; for H.264 video, set "mpegVersion" to 5;
62 // for H.265 video, set "mpegVersion" to 6.
63 // For Opus audio, set "mpegVersion" to 3.
64 // The buffer is assumed to be a PES packet, with a proper PES header.
65 // If "PID" is not -1, then it (currently, only the low 8 bits) is used as the stream's PID,
66 // otherwise the "stream_id" in the PES header is reused to be the stream's PID.
67
68private:
69 // Redefined virtual functions:
71 virtual void doGetNextFrame();
72
73private:
74 void deliverDataToClient(u_int16_t pid, unsigned char* buffer, unsigned bufferSize,
75 unsigned& startPositionInBuffer);
76
78 void deliverPMTPacket(Boolean hasChanged);
79
80 void setProgramStreamMap(unsigned frameSize);
81
82protected:
84
85private:
89 // These two fields are used if we see "program_stream_map"s in the input.
90 struct {
91 unsigned counter;
92 u_int8_t streamType; // for use in Program Maps
94 u_int16_t fPCR_PID, fCurrentPID; // only the low 13 bits are used
96 unsigned char* fInputBuffer;
100 // if nonzero, this is the number of seconds between successive 'segments'. Each 'segment'
101 // begins with a PAT, followed by a PMT.
102 // if zero (the default value), then the frequency of PATs and PMTs depends on the constants
103 // PAT_PERIOD_IF_UNTIMED and PMT_PERIOD_IF_UNTIMED, defined in the .cpp file.
106 // used only if fSegmentationDuration > 0:
107 // 1 if a segment has just ended and the next packet is to be a PAT
108 // 2 if a segment has just ended and the following PAT has been sent; a PMT is next
109 // 0 otherwise
110 double fCurrentSegmentDuration, fPreviousPTS; // used only if fSegmentationDuration > 0
111 onEndOfSegmentFunc* fOnEndOfSegmentFunc; // used only if fSegmentationDuration > 0
113};
114
115
116// The CRC calculation function that Transport Streams use. We make this function public
117// here in case it's useful elsewhere:
118u_int32_t calculateCRC(u_int8_t const* data, unsigned dataLength, u_int32_t initialValue = 0xFFFFFFFF);
119
120#endif
unsigned char Boolean
Definition: Boolean.hh:25
#define PID_TABLE_SIZE
u_int32_t calculateCRC(u_int8_t const *data, unsigned dataLength, u_int32_t initialValue=0xFFFFFFFF)
#define NULL
virtual Boolean isMPEG2TransportStreamMultiplexor() const
MPEG2TransportStreamMultiplexor(UsageEnvironment &env)
struct MPEG2TransportStreamMultiplexor::@2 fPIDState[PID_TABLE_SIZE]
void setTimedSegmentation(unsigned segmentationDuration, onEndOfSegmentFunc *onEndOfSegmentFunc=NULL, void *onEndOfSegmentClientData=NULL)
void deliverDataToClient(u_int16_t pid, unsigned char *buffer, unsigned bufferSize, unsigned &startPositionInBuffer)
void handleNewBuffer(unsigned char *buffer, unsigned bufferSize, int mpegVersion, MPEG1or2Demux::SCR scr, int16_t PID=-1)
virtual void awaitNewBuffer(unsigned char *oldBuffer)=0
void deliverPMTPacket(Boolean hasChanged)
void() onEndOfSegmentFunc(void *clientData, double segmentDuration)
void setProgramStreamMap(unsigned frameSize)