/**********
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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.// A filter that converts a MPEG Transport Stream file - with corresponding index file
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// - to a corresponding Video Elementary Stream. It also uses a "scale" parameter
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// to implement 'trick mode' (fast forward or reverse play, using I-frames) on
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// the video stream.
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// C++ header
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#ifndef _MPEG2_TRANSPORT_STREAM_TRICK_MODE_FILTER_HH
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#define _MPEG2_TRANSPORT_STREAM_TRICK_MODE_FILTER_HH
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#ifndef _FRAMED_FILTER_HH
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#include "FramedFilter.hh"
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#endif
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#ifndef _MPEG2_TRANSPORT_STREAM_INDEX_FILE_HH
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#include "MPEG2TransportStreamIndexFile.hh"
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#endif
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#ifndef TRANSPORT_PACKET_SIZE
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#define TRANSPORT_PACKET_SIZE 188
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#endif
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class MPEG2TransportStreamTrickModeFilter: public FramedFilter {
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public:
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static MPEG2TransportStreamTrickModeFilter*
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createNew(UsageEnvironment& env, FramedSource* inputSource,
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MPEG2TransportStreamIndexFile* indexFile, int scale);
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Boolean seekTo(unsigned long tsPacketNumber, unsigned long indexRecordNumber);
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unsigned long nextIndexRecordNum() const { return fNextIndexRecordNum; }
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void forgetInputSource() { fInputSource = NULL; }
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// this lets us delete this without also deleting the input Transport Stream
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protected:
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MPEG2TransportStreamTrickModeFilter(UsageEnvironment& env, FramedSource* inputSource,
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MPEG2TransportStreamIndexFile* indexFile, int scale);
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// called only by createNew()
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virtual ~MPEG2TransportStreamTrickModeFilter();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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virtual void doStopGettingFrames();
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private:
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void attemptDeliveryToClient();
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void seekToTransportPacket(unsigned long tsPacketNum);
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void readTransportPacket(unsigned long tsPacketNum); // asynchronously
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize);
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static void onSourceClosure(void* clientData);
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void onSourceClosure1();
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private:
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Boolean fHaveStarted;
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MPEG2TransportStreamIndexFile* fIndexFile;
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int fScale; // absolute value
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int fDirection; // 1 => forward; -1 => reverse
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enum {
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SKIPPING_FRAME,
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DELIVERING_SAVED_FRAME,
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SAVING_AND_DELIVERING_FRAME
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} fState;
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unsigned fFrameCount;
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unsigned long fNextIndexRecordNum; // next to be read from the index file
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unsigned long fNextTSPacketNum; // next to be read from the transport stream file
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unsigned char fInputBuffer[TRANSPORT_PACKET_SIZE];
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unsigned long fCurrentTSPacketNum; // corresponding to data currently in the buffer
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unsigned long fDesiredTSPacketNum;
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u_int8_t fDesiredDataOffset, fDesiredDataSize;
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float fDesiredDataPCR, fFirstPCR;
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unsigned long fSavedFrameIndexRecordStart;
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unsigned long fSavedSequentialIndexRecordNum;
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Boolean fUseSavedFrameNextTime;
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};
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#endif
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