132 lines
5.3 KiB
C++
132 lines
5.3 KiB
C++
/**********
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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) 1996-2024 Live Networks, Inc. All rights reserved.
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// A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
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// on demand, from a MPEG-2 Transport Stream file.
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// C++ header
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#ifndef _MPEG2_TRANSPORT_FILE_SERVER_MEDIA_SUBSESSION_HH
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#define _MPEG2_TRANSPORT_FILE_SERVER_MEDIA_SUBSESSION_HH
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#ifndef _FILE_SERVER_MEDIA_SUBSESSION_HH
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#include "FileServerMediaSubsession.hh"
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#endif
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#ifndef _MPEG2_TRANSPORT_STREAM_FRAMER_HH
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#include "MPEG2TransportStreamFramer.hh"
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#endif
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#ifndef _BYTE_STREAM_FILE_SOURCE_HH
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#include "ByteStreamFileSource.hh"
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#endif
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#ifndef _MPEG2_TRANSPORT_STREAM_TRICK_MODE_FILTER_HH
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#include "MPEG2TransportStreamTrickModeFilter.hh"
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#endif
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#ifndef _MPEG2_TRANSPORT_STREAM_FROM_ES_SOURCE_HH
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#include "MPEG2TransportStreamFromESSource.hh"
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#endif
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class ClientTrickPlayState; // forward
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class LIVEMEDIA_API MPEG2TransportFileServerMediaSubsession: public FileServerMediaSubsession {
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public:
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static MPEG2TransportFileServerMediaSubsession*
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createNew(UsageEnvironment& env,
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char const* dataFileName, char const* indexFileName,
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Boolean reuseFirstSource);
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protected:
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MPEG2TransportFileServerMediaSubsession(UsageEnvironment& env,
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char const* fileName,
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MPEG2TransportStreamIndexFile* indexFile,
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Boolean reuseFirstSource);
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// called only by createNew();
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virtual ~MPEG2TransportFileServerMediaSubsession();
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virtual ClientTrickPlayState* newClientTrickPlayState();
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private: // redefined virtual functions
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// Note that because - to implement 'trick play' operations - we're operating on
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// more than just the input source, we reimplement some functions that are
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// already implemented in "OnDemandServerMediaSubsession", rather than
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// reimplementing "seekStreamSource()" and "setStreamSourceScale()":
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virtual void startStream(unsigned clientSessionId, void* streamToken,
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TaskFunc* rtcpRRHandler,
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void* rtcpRRHandlerClientData,
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unsigned short& rtpSeqNum,
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unsigned& rtpTimestamp,
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ServerRequestAlternativeByteHandler* serverRequestAlternativeByteHandler,
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void* serverRequestAlternativeByteHandlerClientData);
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virtual void pauseStream(unsigned clientSessionId, void* streamToken);
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virtual void seekStream(unsigned clientSessionId, void* streamToken, double& seekNPT, double streamDuration, u_int64_t& numBytes);
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virtual void setStreamScale(unsigned clientSessionId, void* streamToken, float scale);
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virtual void deleteStream(unsigned clientSessionId, void*& streamToken);
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// The virtual functions that are usually implemented by "ServerMediaSubsession"s:
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virtual FramedSource* createNewStreamSource(unsigned clientSessionId,
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unsigned& estBitrate);
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virtual RTPSink* createNewRTPSink(Groupsock* rtpGroupsock,
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unsigned char rtpPayloadTypeIfDynamic,
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FramedSource* inputSource);
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virtual void testScaleFactor(float& scale);
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virtual float duration() const;
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private:
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ClientTrickPlayState* lookupClient(unsigned clientSessionId);
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private:
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MPEG2TransportStreamIndexFile* fIndexFile;
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float fDuration;
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HashTable* fClientSessionHashTable; // indexed by client session id
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};
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// This class encapsulates the 'trick play' state for each current client (for
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// a given "MPEG2TransportFileServerMediaSubsession" - i.e., Transport Stream file).
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// It is used only within the implementation of "MPEG2TransportFileServerMediaSubsession", but is included here,
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// in case subclasses of "MPEG2TransportFileServerMediaSubsession" want to use it.
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class LIVEMEDIA_API ClientTrickPlayState {
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public:
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ClientTrickPlayState(MPEG2TransportStreamIndexFile* indexFile);
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// Functions to bring "fNPT", "fTSRecordNum" and "fIxRecordNum" in sync:
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unsigned long updateStateFromNPT(double npt, double seekDuration);
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void updateStateOnScaleChange();
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void updateStateOnPlayChange(Boolean reverseToPreviousVSH);
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void handleStreamDeletion();
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void setSource(MPEG2TransportStreamFramer* framer);
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void setNextScale(float nextScale) { fNextScale = nextScale; }
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Boolean areChangingScale() const { return fNextScale != fScale; }
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protected:
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void updateTSRecordNum();
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void reseekOriginalTransportStreamSource();
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protected:
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MPEG2TransportStreamIndexFile* fIndexFile;
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ByteStreamFileSource* fOriginalTransportStreamSource;
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MPEG2TransportStreamTrickModeFilter* fTrickModeFilter;
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MPEG2TransportStreamFromESSource* fTrickPlaySource;
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MPEG2TransportStreamFramer* fFramer;
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float fScale, fNextScale, fNPT;
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unsigned long fTSRecordNum, fIxRecordNum;
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};
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#endif
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