| /********** |
| 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) 1996-2020 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 |