| /********** |
| 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 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 <stdio.h> |
| |
| #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 |