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/**********
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.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**********/
// "liveMedia"
// Copyright (c) 1996-2004 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;
void writeGetCmd(char const* hostName, unsigned short portNum,
char const* fileName);
float filePlayTime() const; // in seconds
void setPresentationTimeScale(unsigned scale) { fPresentationTimeScale = scale; }
void seekWithinFile(float seekNPT);
void checkForXingHeader(); // hack for Xing VBR files
private:
MP3FrameParams& fr() {return fCurrentFrame;}
MP3FrameParams const& fr() const {return fCurrentFrame;}
struct timeval currentFramePlayTime() const;
Boolean findNextFrame();
unsigned readFromStream(unsigned char* buf, unsigned numChars);
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
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