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MP3StreamState.hh
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1 /**********
2 This library is free software; you can redistribute it and/or modify it under
3 the terms of the GNU Lesser General Public License as published by the
4 Free Software Foundation; either version 3 of the License, or (at your
5 option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
6 
7 This library is distributed in the hope that it will be useful, but WITHOUT
8 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
9 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
10 more details.
11 
12 You should have received a copy of the GNU Lesser General Public License
13 along with this library; if not, write to the Free Software Foundation, Inc.,
14 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15 **********/
16 // "liveMedia"
17 // Copyright (c) 1996-2021 Live Networks, Inc. All rights reserved.
18 // A class encapsulating the state of a MP3 stream
19 // C++ header
20 
21 #ifndef _MP3_STREAM_STATE_HH
22 #define _MP3_STREAM_STATE_HH
23 
24 #ifndef _USAGE_ENVIRONMENT_HH
25 #include "UsageEnvironment.hh"
26 #endif
27 #ifndef _BOOLEAN_HH
28 #include "Boolean.hh"
29 #endif
30 #ifndef _MP3_INTERNALS_HH
31 #include "MP3Internals.hh"
32 #endif
33 #ifndef _NET_COMMON_H
34 #include "NetCommon.h"
35 #endif
36 
37 #include <stdio.h>
38 
39 #define XING_TOC_LENGTH 100
40 
42 public:
44  virtual ~MP3StreamState();
45 
46  void assignStream(FILE* fid, unsigned fileSize);
47 
48  unsigned findNextHeader(struct timeval& presentationTime);
49  Boolean readFrame(unsigned char* outBuf, unsigned outBufSize,
50  unsigned& resultFrameSize,
51  unsigned& resultDurationInMicroseconds);
52  // called after findNextHeader()
53 
54  void getAttributes(char* buffer, unsigned bufferSize) const;
55 
56  float filePlayTime() const; // in seconds
57  unsigned fileSize() const { return fFileSize; }
58  void setPresentationTimeScale(unsigned scale) { fPresentationTimeScale = scale; }
59  unsigned getByteNumberFromPositionFraction(float fraction); // 0.0 <= fraction <= 1.0
60  void seekWithinFile(unsigned seekByteNumber);
61 
62  void checkForXingHeader(); // hack for Xing VBR files
63 
64 protected: // private->protected requested by Pierre l'Hussiez
65  unsigned readFromStream(unsigned char* buf, unsigned numChars);
66 
67 private:
69  MP3FrameParams const& fr() const {return fCurrentFrame;}
70 
71  struct timeval currentFramePlayTime() const;
72 
74 
75 private:
76  FILE* fFid;
78  unsigned fFileSize;
79  unsigned fNumFramesInFile;
81  // used if we're streaming at other than the normal rate
83  u_int8_t fXingTOC[XING_TOC_LENGTH]; // set iff "fHasXingTOC" is True
84 
86  struct timeval fNextFramePresentationTime;
87 };
88 
89 #endif
unsigned char Boolean
Definition: Boolean.hh:25
#define XING_TOC_LENGTH
MP3FrameParams & fr()
float filePlayTime() const
MP3FrameParams fCurrentFrame
unsigned readFromStream(unsigned char *buf, unsigned numChars)
unsigned fFileSize
Boolean findNextFrame()
Boolean fFidIsReallyASocket
u_int8_t fXingTOC[XING_TOC_LENGTH]
unsigned fPresentationTimeScale
void checkForXingHeader()
virtual ~MP3StreamState()
struct timeval fNextFramePresentationTime
void getAttributes(char *buffer, unsigned bufferSize) const
void setPresentationTimeScale(unsigned scale)
unsigned findNextHeader(struct timeval &presentationTime)
Boolean readFrame(unsigned char *outBuf, unsigned outBufSize, unsigned &resultFrameSize, unsigned &resultDurationInMicroseconds)
void seekWithinFile(unsigned seekByteNumber)
unsigned getByteNumberFromPositionFraction(float fraction)
unsigned fileSize() const
unsigned fNumFramesInFile
struct timeval currentFramePlayTime() const
void assignStream(FILE *fid, unsigned fileSize)