| /********** |
| 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 class that encapsulates an Ogg file |
| // C++ header |
| |
| #ifndef _OGG_FILE_HH |
| #define _OGG_FILE_HH |
| |
| #ifndef _RTP_SINK_HH |
| #include "RTPSink.hh" |
| #endif |
| #ifndef _HASH_TABLE_HH |
| #include "HashTable.hh" |
| #endif |
| |
| class OggTrack; // forward |
| class OggDemux; // forward |
| |
| class OggFile: public Medium { |
| public: |
| typedef void (onCreationFunc)(OggFile* newFile, void* clientData); |
| static void createNew(UsageEnvironment& env, char const* fileName, |
| onCreationFunc* onCreation, void* onCreationClientData); |
| // Note: Unlike most "createNew()" functions, this one doesn't return a new object |
| // immediately. Instead, because this class requires file reading (to parse the |
| // Ogg track headers) before a new object can be initialized, the creation of a new object |
| // is signalled by calling - from the event loop - an 'onCreationFunc' that is passed as |
| // a parameter to "createNew()". |
| |
| OggTrack* lookup(u_int32_t trackNumber); |
| |
| OggDemux* newDemux(); |
| // Creates a demultiplexor for extracting tracks from this file. |
| // (Separate clients will typically have separate demultiplexors.) |
| |
| char const* fileName() const { return fFileName; } |
| unsigned numTracks() const; |
| |
| FramedSource* |
| createSourceForStreaming(FramedSource* baseSource, u_int32_t trackNumber, |
| unsigned& estBitrate, unsigned& numFiltersInFrontOfTrack); |
| // Takes a data source (which must be a demultiplexed track from this file) and returns |
| // a (possibly modified) data source that can be used for streaming. |
| |
| RTPSink* createRTPSinkForTrackNumber(u_int32_t trackNumber, Groupsock* rtpGroupsock, |
| unsigned char rtpPayloadTypeIfDynamic); |
| // Creates a "RTPSink" object that would be appropriate for streaming the specified track, |
| // or NULL if no appropriate "RTPSink" exists |
| |
| class OggTrackTable& trackTable() { return *fTrackTable; } |
| |
| private: |
| OggFile(UsageEnvironment& env, char const* fileName, onCreationFunc* onCreation, void* onCreationClientData); |
| // called only by createNew() |
| virtual ~OggFile(); |
| |
| static void handleEndOfBosPageParsing(void* clientData); |
| void handleEndOfBosPageParsing(); |
| |
| void addTrack(OggTrack* newTrack); |
| void removeDemux(OggDemux* demux); |
| |
| private: |
| friend class OggFileParser; |
| friend class OggDemux; |
| char const* fFileName; |
| onCreationFunc* fOnCreation; |
| void* fOnCreationClientData; |
| |
| class OggTrackTable* fTrackTable; |
| HashTable* fDemuxesTable; |
| class OggFileParser* fParserForInitialization; |
| }; |
| |
| class OggTrack { |
| public: |
| OggTrack(); |
| virtual ~OggTrack(); |
| |
| // track parameters |
| u_int32_t trackNumber; // bitstream serial number |
| char const* mimeType; // NULL if not known |
| |
| unsigned samplingFrequency, numChannels; // for audio tracks |
| unsigned estBitrate; // estimate, in kbps (for RTCP) |
| |
| // Special headers for Vorbis audio, Theora video, and Opus audio tracks: |
| struct _vtoHdrs { |
| u_int8_t* header[3]; // "identification", "comment", "setup" |
| unsigned headerSize[3]; |
| |
| // Fields specific to Vorbis audio: |
| unsigned blocksize[2]; // samples per frame (packet) |
| unsigned uSecsPerPacket[2]; // computed as (blocksize[i]*1000000)/samplingFrequency |
| unsigned vorbis_mode_count; |
| unsigned ilog_vorbis_mode_count_minus_1; |
| u_int8_t* vorbis_mode_blockflag; |
| // an array (of size "vorbis_mode_count") of indexes into the (2-entry) "blocksize" array |
| |
| // Fields specific to Theora video: |
| u_int8_t KFGSHIFT; |
| unsigned uSecsPerFrame; |
| |
| } vtoHdrs; |
| |
| Boolean weNeedHeaders() const { |
| return |
| vtoHdrs.header[0] == NULL || |
| vtoHdrs.header[1] == NULL || |
| (vtoHdrs.header[2] == NULL && strcmp(mimeType, "audio/OPUS") != 0); |
| } |
| }; |
| |
| class OggTrackTableIterator { |
| public: |
| OggTrackTableIterator(class OggTrackTable& ourTable); |
| virtual ~OggTrackTableIterator(); |
| |
| OggTrack* next(); |
| |
| private: |
| HashTable::Iterator* fIter; |
| }; |
| |
| class OggDemux: public Medium { |
| public: |
| FramedSource* newDemuxedTrack(u_int32_t& resultTrackNumber); |
| // Returns a new stream ("FramedSource" subclass) that represents the next media track |
| // from the file. This function returns NULL when no more media tracks exist. |
| |
| FramedSource* newDemuxedTrackByTrackNumber(unsigned trackNumber); |
| // As above, but creates a new stream for a specific track number within the Matroska file. |
| // (You should not call this function more than once with the same track number.) |
| |
| // Note: We assume that: |
| // - Every track created by "newDemuxedTrack()" is later read |
| // - All calls to "newDemuxedTrack()" are made before any track is read |
| |
| protected: |
| friend class OggFile; |
| friend class OggFileParser; |
| class OggDemuxedTrack* lookupDemuxedTrack(u_int32_t trackNumber); |
| |
| OggDemux(OggFile& ourFile); |
| virtual ~OggDemux(); |
| |
| private: |
| friend class OggDemuxedTrack; |
| void removeTrack(u_int32_t trackNumber); |
| void continueReading(); // called by a demuxed track to tell us that it has a pending read ("doGetNextFrame()") |
| |
| static void handleEndOfFile(void* clientData); |
| void handleEndOfFile(); |
| |
| private: |
| OggFile& fOurFile; |
| class OggFileParser* fOurParser; |
| HashTable* fDemuxedTracksTable; |
| OggTrackTableIterator* fIter; |
| }; |
| |
| #endif |