| /********** |
| 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 2.1 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) 1996-2015 Live Networks, Inc. All rights reserved. |
| // Demultiplexer for a MPEG 1 or 2 Program Stream |
| // C++ header |
| |
| #ifndef _MPEG_1OR2_DEMUX_HH |
| #define _MPEG_1OR2_DEMUX_HH |
| |
| #ifndef _FRAMED_SOURCE_HH |
| #include "FramedSource.hh" |
| #endif |
| |
| class MPEG1or2DemuxedElementaryStream; // forward |
| |
| class MPEG1or2Demux: public Medium { |
| public: |
| static MPEG1or2Demux* createNew(UsageEnvironment& env, |
| FramedSource* inputSource, |
| Boolean reclaimWhenLastESDies = False); |
| // If "reclaimWhenLastESDies" is True, the the demux is deleted when |
| // all "MPEG1or2DemuxedElementaryStream"s that we created get deleted. |
| |
| MPEG1or2DemuxedElementaryStream* newElementaryStream(u_int8_t streamIdTag); |
| |
| // Specialized versions of the above for audio and video: |
| MPEG1or2DemuxedElementaryStream* newAudioStream(); |
| MPEG1or2DemuxedElementaryStream* newVideoStream(); |
| |
| // A hack for getting raw, undemuxed PES packets from the Program Stream: |
| MPEG1or2DemuxedElementaryStream* newRawPESStream(); |
| |
| void getNextFrame(u_int8_t streamIdTag, |
| unsigned char* to, unsigned maxSize, |
| FramedSource::afterGettingFunc* afterGettingFunc, |
| void* afterGettingClientData, |
| FramedSource::onCloseFunc* onCloseFunc, |
| void* onCloseClientData); |
| // similar to FramedSource::getNextFrame(), except that it also |
| // takes a stream id tag as parameter. |
| |
| void stopGettingFrames(u_int8_t streamIdTag); |
| // similar to FramedSource::stopGettingFrames(), except that it also |
| // takes a stream id tag as parameter. |
| |
| static void handleClosure(void* clientData); |
| // This should be called (on ourself) if the source is discovered |
| // to be closed (i.e., no longer readable) |
| |
| FramedSource* inputSource() const { return fInputSource; } |
| |
| class SCR { |
| public: |
| SCR(); |
| |
| u_int8_t highBit; |
| u_int32_t remainingBits; |
| u_int16_t extension; |
| |
| Boolean isValid; |
| }; |
| SCR& lastSeenSCR() { return fLastSeenSCR; } |
| |
| unsigned char mpegVersion() const { return fMPEGversion; } |
| |
| void flushInput(); // should be called before any 'seek' on the underlying source |
| |
| private: |
| MPEG1or2Demux(UsageEnvironment& env, |
| FramedSource* inputSource, Boolean reclaimWhenLastESDies); |
| // called only by createNew() |
| virtual ~MPEG1or2Demux(); |
| |
| void registerReadInterest(u_int8_t streamIdTag, |
| unsigned char* to, unsigned maxSize, |
| FramedSource::afterGettingFunc* afterGettingFunc, |
| void* afterGettingClientData, |
| FramedSource::onCloseFunc* onCloseFunc, |
| void* onCloseClientData); |
| |
| Boolean useSavedData(u_int8_t streamIdTag, |
| unsigned char* to, unsigned maxSize, |
| FramedSource::afterGettingFunc* afterGettingFunc, |
| void* afterGettingClientData); |
| |
| static void continueReadProcessing(void* clientData, |
| unsigned char* ptr, unsigned size, |
| struct timeval presentationTime); |
| void continueReadProcessing(); |
| |
| private: |
| friend class MPEG1or2DemuxedElementaryStream; |
| void noteElementaryStreamDeletion(MPEG1or2DemuxedElementaryStream* es); |
| |
| private: |
| FramedSource* fInputSource; |
| SCR fLastSeenSCR; |
| unsigned char fMPEGversion; |
| |
| unsigned char fNextAudioStreamNumber; |
| unsigned char fNextVideoStreamNumber; |
| Boolean fReclaimWhenLastESDies; |
| unsigned fNumOutstandingESs; |
| |
| // A descriptor for each possible stream id tag: |
| typedef struct OutputDescriptor { |
| // input parameters |
| unsigned char* to; unsigned maxSize; |
| FramedSource::afterGettingFunc* fAfterGettingFunc; |
| void* afterGettingClientData; |
| FramedSource::onCloseFunc* fOnCloseFunc; |
| void* onCloseClientData; |
| |
| // output parameters |
| unsigned frameSize; struct timeval presentationTime; |
| class SavedData; // forward |
| SavedData* savedDataHead; |
| SavedData* savedDataTail; |
| unsigned savedDataTotalSize; |
| |
| // status parameters |
| Boolean isPotentiallyReadable; |
| Boolean isCurrentlyActive; |
| Boolean isCurrentlyAwaitingData; |
| } OutputDescriptor_t; |
| OutputDescriptor_t fOutput[256]; |
| |
| unsigned fNumPendingReads; |
| Boolean fHaveUndeliveredData; |
| |
| private: // parsing state |
| class MPEGProgramStreamParser* fParser; |
| friend class MPEGProgramStreamParser; // hack |
| }; |
| |
| #endif |