/********** 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 .) 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 class encapsulating the state of a MP3 stream // C++ header #ifndef _MP3_STREAM_STATE_HH #define _MP3_STREAM_STATE_HH #ifndef _USAGE_ENVIRONMENT_HH #include "UsageEnvironment.hh" #endif #ifndef _BOOLEAN_HH #include "Boolean.hh" #endif #ifndef _MP3_INTERNALS_HH #include "MP3Internals.hh" #endif #ifndef _NET_COMMON_H #include "NetCommon.h" #endif #include #define XING_TOC_LENGTH 100 class MP3StreamState { public: MP3StreamState(UsageEnvironment& env); virtual ~MP3StreamState(); void assignStream(FILE* fid, unsigned fileSize); unsigned findNextHeader(struct timeval& presentationTime); Boolean readFrame(unsigned char* outBuf, unsigned outBufSize, unsigned& resultFrameSize, unsigned& resultDurationInMicroseconds); // called after findNextHeader() void getAttributes(char* buffer, unsigned bufferSize) const; float filePlayTime() const; // in seconds unsigned fileSize() const { return fFileSize; } void setPresentationTimeScale(unsigned scale) { fPresentationTimeScale = scale; } unsigned getByteNumberFromPositionFraction(float fraction); // 0.0 <= fraction <= 1.0 void seekWithinFile(unsigned seekByteNumber); void checkForXingHeader(); // hack for Xing VBR files protected: // private->protected requested by Pierre l'Hussiez unsigned readFromStream(unsigned char* buf, unsigned numChars); private: MP3FrameParams& fr() {return fCurrentFrame;} MP3FrameParams const& fr() const {return fCurrentFrame;} struct timeval currentFramePlayTime() const; Boolean findNextFrame(); private: UsageEnvironment& fEnv; FILE* fFid; Boolean fFidIsReallyASocket; unsigned fFileSize; unsigned fNumFramesInFile; unsigned fPresentationTimeScale; // used if we're streaming at other than the normal rate Boolean fIsVBR, fHasXingTOC; u_int8_t fXingTOC[XING_TOC_LENGTH]; // set iff "fHasXingTOC" is True MP3FrameParams fCurrentFrame; struct timeval fNextFramePresentationTime; }; #endif