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126 lines
2.9 KiB
C++
126 lines
2.9 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Uses mp3 code from: http://www.codeproject.com/audio/MPEGAudioInfo.asp
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//
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// There don't appear to be any licensing restrictions for using this code:
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//
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/*
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- Readme - MPEG Audio Info Tool V2.0 - 2004-11-01
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Description:
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This tool can display information about MPEG audio files. It supports
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MPEG1, MPEG2, MPEG2.5 in all three layers. You can get all the fields
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from the MPEG audio frame in each frame of the file. Additionally you
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can check the whole file for inconsistencies.
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This tool was written as an example on how to use the classes:
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CMPAFile, CMPAHeader, CVBRHeader and CMPAException.
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The article MPEG Audio Frame Header on Sourceproject
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[http://www.codeproject.com/audio/MPEGAudioInfo.asp]
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provides additional information about these classes and the frame header
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in general.
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This tool was written with MS Visual C++ 7.1. The MFC library is
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statically linked.
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*/
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//=============================================================================
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#ifndef MPAFILE_H
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#define MPAFILE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#pragma once
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#include "VBRHeader.h"
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#include "MPAHeader.h"
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#include "filesystem.h"
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// exception class
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class CMPAException
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{
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public:
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enum ErrorIDs
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{
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ErrOpenFile,
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ErrSetPosition,
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ErrReadFile,
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EndOfBuffer,
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NoVBRHeader,
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IncompleteVBRHeader,
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NoFrameInTolerance,
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NoFrame
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};
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CMPAException( ErrorIDs ErrorID, const char *szFile, const char *szFunction = NULL, bool bGetLastError=false );
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// copy constructor (necessary because of LPSTR members)
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CMPAException(const CMPAException& Source);
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~CMPAException(void);
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ErrorIDs GetErrorID() { return m_ErrorID; }
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void ShowError();
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private:
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ErrorIDs m_ErrorID;
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bool m_bGetLastError;
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const char *m_szFunction;
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const char *m_szFile;
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};
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class CMPAFile
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{
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public:
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CMPAFile( const char *szFile, uint32 dwFileOffset, FileHandle_t hFile = FILESYSTEM_INVALID_HANDLE );
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~CMPAFile(void);
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uint32 ExtractBytes( uint32 &dwOffset, uint32 dwNumBytes, bool bMoveOffset = true );
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const char *GetFilename() const { return m_szFile; };
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bool GetNextFrame();
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bool GetPrevFrame();
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bool GetFirstFrame();
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bool GetLastFrame();
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private:
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static const uint32 m_dwInitBufferSize;
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// methods for file access
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void Open( const char *szFilename );
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void SetPosition( int offset );
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uint32 Read( void *pData, uint32 dwSize, uint32 dwOffset );
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void FillBuffer( uint32 dwOffsetToRead );
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static uint32 m_dwBufferSizes[MAXTIMESREAD];
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// concerning file itself
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FileHandle_t m_hFile;
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const char *m_szFile;
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bool m_bMustReleaseFile;
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public:
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uint32 m_dwBegin; // offset of first MPEG Audio frame
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uint32 m_dwEnd; // offset of last MPEG Audio frame (estimated)
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bool m_bVBRFile;
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uint32 m_dwBytesPerSec;
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CMPAHeader* m_pMPAHeader;
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uint32 m_dwFrameNo;
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CVBRHeader* m_pVBRHeader; // XING or VBRI
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// concerning read-buffer
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uint32 m_dwNumTimesRead;
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char *m_pBuffer;
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uint32 m_dwBufferSize;
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};
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#endif // MPAFILE_H
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