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| | | /********** |
| | | This library is free software; you can redistribute it and/or modify it under |
| | | the terms of the GNU Lesser General Public License as published by the |
| | | Free Software Foundation; either version 3 of the License, or (at your |
| | | option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| | | |
| | | This library is distributed in the hope that it will be useful, but WITHOUT |
| | | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| | | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
| | | more details. |
| | | |
| | | You should have received a copy of the GNU Lesser General Public License |
| | | along with this library; if not, write to the Free Software Foundation, Inc., |
| | | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | | **********/ |
| | | // "liveMedia" |
| | | // Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved.// A filter that converts a MPEG Transport Stream file - with corresponding index file |
| | | // - to a corresponding Video Elementary Stream. It also uses a "scale" parameter |
| | | // to implement 'trick mode' (fast forward or reverse play, using I-frames) on |
| | | // the video stream. |
| | | // C++ header |
| | | |
| | | #ifndef _MPEG2_TRANSPORT_STREAM_TRICK_MODE_FILTER_HH |
| | | #define _MPEG2_TRANSPORT_STREAM_TRICK_MODE_FILTER_HH |
| | | |
| | | #ifndef _FRAMED_FILTER_HH |
| | | #include "FramedFilter.hh" |
| | | #endif |
| | | |
| | | #ifndef _MPEG2_TRANSPORT_STREAM_INDEX_FILE_HH |
| | | #include "MPEG2TransportStreamIndexFile.hh" |
| | | #endif |
| | | |
| | | #ifndef TRANSPORT_PACKET_SIZE |
| | | #define TRANSPORT_PACKET_SIZE 188 |
| | | #endif |
| | | |
| | | class MPEG2TransportStreamTrickModeFilter: public FramedFilter { |
| | | public: |
| | | static MPEG2TransportStreamTrickModeFilter* |
| | | createNew(UsageEnvironment& env, FramedSource* inputSource, |
| | | MPEG2TransportStreamIndexFile* indexFile, int scale); |
| | | |
| | | Boolean seekTo(unsigned long tsPacketNumber, unsigned long indexRecordNumber); |
| | | |
| | | unsigned long nextIndexRecordNum() const { return fNextIndexRecordNum; } |
| | | |
| | | void forgetInputSource() { fInputSource = NULL; } |
| | | // this lets us delete this without also deleting the input Transport Stream |
| | | |
| | | protected: |
| | | MPEG2TransportStreamTrickModeFilter(UsageEnvironment& env, FramedSource* inputSource, |
| | | MPEG2TransportStreamIndexFile* indexFile, int scale); |
| | | // called only by createNew() |
| | | virtual ~MPEG2TransportStreamTrickModeFilter(); |
| | | |
| | | private: |
| | | // Redefined virtual functions: |
| | | virtual void doGetNextFrame(); |
| | | virtual void doStopGettingFrames(); |
| | | |
| | | private: |
| | | void attemptDeliveryToClient(); |
| | | void seekToTransportPacket(unsigned long tsPacketNum); |
| | | void readTransportPacket(unsigned long tsPacketNum); // asynchronously |
| | | |
| | | static void afterGettingFrame(void* clientData, unsigned frameSize, |
| | | unsigned numTruncatedBytes, |
| | | struct timeval presentationTime, |
| | | unsigned durationInMicroseconds); |
| | | void afterGettingFrame1(unsigned frameSize); |
| | | |
| | | static void onSourceClosure(void* clientData); |
| | | void onSourceClosure1(); |
| | | |
| | | private: |
| | | Boolean fHaveStarted; |
| | | MPEG2TransportStreamIndexFile* fIndexFile; |
| | | int fScale; // absolute value |
| | | int fDirection; // 1 => forward; -1 => reverse |
| | | enum { |
| | | SKIPPING_FRAME, |
| | | DELIVERING_SAVED_FRAME, |
| | | SAVING_AND_DELIVERING_FRAME |
| | | } fState; |
| | | unsigned fFrameCount; |
| | | unsigned long fNextIndexRecordNum; // next to be read from the index file |
| | | unsigned long fNextTSPacketNum; // next to be read from the transport stream file |
| | | unsigned char fInputBuffer[TRANSPORT_PACKET_SIZE]; |
| | | unsigned long fCurrentTSPacketNum; // corresponding to data currently in the buffer |
| | | unsigned long fDesiredTSPacketNum; |
| | | u_int8_t fDesiredDataOffset, fDesiredDataSize; |
| | | float fDesiredDataPCR, fFirstPCR; |
| | | unsigned long fSavedFrameIndexRecordStart; |
| | | unsigned long fSavedSequentialIndexRecordNum; |
| | | Boolean fUseSavedFrameNextTime; |
| | | }; |
| | | |
| | | #endif |