/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved.
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// A class encapsulating the state of a MP3 stream
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// C++ header
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#ifndef _MP3_STREAM_STATE_HH
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#define _MP3_STREAM_STATE_HH
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#ifndef _USAGE_ENVIRONMENT_HH
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#include "UsageEnvironment.hh"
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#endif
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#ifndef _BOOLEAN_HH
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#include "Boolean.hh"
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#endif
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#ifndef _MP3_INTERNALS_HH
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#include "MP3Internals.hh"
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#endif
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#ifndef _NET_COMMON_H
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#include "NetCommon.h"
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#endif
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#include <stdio.h>
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#define XING_TOC_LENGTH 100
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class MP3StreamState {
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public:
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MP3StreamState(UsageEnvironment& env);
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virtual ~MP3StreamState();
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void assignStream(FILE* fid, unsigned fileSize);
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unsigned findNextHeader(struct timeval& presentationTime);
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Boolean readFrame(unsigned char* outBuf, unsigned outBufSize,
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unsigned& resultFrameSize,
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unsigned& resultDurationInMicroseconds);
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// called after findNextHeader()
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void getAttributes(char* buffer, unsigned bufferSize) const;
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float filePlayTime() const; // in seconds
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unsigned fileSize() const { return fFileSize; }
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void setPresentationTimeScale(unsigned scale) { fPresentationTimeScale = scale; }
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unsigned getByteNumberFromPositionFraction(float fraction); // 0.0 <= fraction <= 1.0
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void seekWithinFile(unsigned seekByteNumber);
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void checkForXingHeader(); // hack for Xing VBR files
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protected: // private->protected requested by Pierre l'Hussiez
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unsigned readFromStream(unsigned char* buf, unsigned numChars);
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private:
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MP3FrameParams& fr() {return fCurrentFrame;}
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MP3FrameParams const& fr() const {return fCurrentFrame;}
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struct timeval currentFramePlayTime() const;
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Boolean findNextFrame();
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private:
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UsageEnvironment& fEnv;
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FILE* fFid;
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Boolean fFidIsReallyASocket;
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unsigned fFileSize;
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unsigned fNumFramesInFile;
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unsigned fPresentationTimeScale;
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// used if we're streaming at other than the normal rate
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Boolean fIsVBR, fHasXingTOC;
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u_int8_t fXingTOC[XING_TOC_LENGTH]; // set iff "fHasXingTOC" is True
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MP3FrameParams fCurrentFrame;
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struct timeval fNextFramePresentationTime;
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};
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#endif
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