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100 lines
4.6 KiB
C++
100 lines
4.6 KiB
C++
/*****************************************************************************************
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APEInfo.h
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Copyright (C) 2000 by Matthew T. Ashland All Rights Reserved.
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Simple method for working with APE files... it encapsulates reading, writing and getting
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file information. Just create a CAPEInfo class, call OpenFile(), and use the class methods
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to do whatever you need... the destructor will take care of any cleanup
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Notes:
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-Most all functions return 0 upon success, and some error code (other than 0) on
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failure. However, all of the file functions that are wrapped from the Win32 API
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return 0 on failure and some other number on success. This applies to ReadFile,
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WriteFile, SetFilePointer, etc...
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WARNING:
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-This class driven system for using Monkey's Audio is still in development, so
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I can't make any guarantees that the classes and libraries won't change before
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everything gets finalized. Use them at your own risk
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*****************************************************************************************/
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#ifndef APE_APEINFO_H
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#define APE_APEINFO_H
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#include "IO.h"
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#include "APETag.h"
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#include "MACLib.h"
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/*****************************************************************************************
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APE_FILE_INFO - structure which describes most aspects of an APE file
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(used internally for speed and ease)
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*****************************************************************************************/
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struct APE_FILE_INFO
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{
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int nVersion; // file version number * 1000 (3.93 = 3930)
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int nCompressionLevel; // the compression level
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int nFormatFlags; // format flags
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int nTotalFrames; // the total number frames (frames are used internally)
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int nBlocksPerFrame; // the samples in a frame (frames are used internally)
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int nFinalFrameBlocks; // the number of samples in the final frame
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int nChannels; // audio channels
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int nSampleRate; // audio samples per second
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int nBitsPerSample; // audio bits per sample
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int nBytesPerSample; // audio bytes per sample
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int nBlockAlign; // audio block align (channels * bytes per sample)
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int nWAVHeaderBytes; // header bytes of the original WAV
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int nWAVDataBytes; // data bytes of the original WAV
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int nWAVTerminatingBytes; // terminating bytes of the original WAV
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int nWAVTotalBytes; // total bytes of the original WAV
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int nAPETotalBytes; // total bytes of the APE file
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int nTotalBlocks; // the total number audio blocks
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int nLengthMS; // the length in milliseconds
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int nAverageBitrate; // the kbps (i.e. 637 kpbs)
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int nDecompressedBitrate; // the kbps of the decompressed audio (i.e. 1440 kpbs for CD audio)
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int nPeakLevel; // the peak audio level (-1 if unknown)
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};
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/*****************************************************************************************
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Helper macros... sort of hacky...
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*****************************************************************************************/
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#define GET_USES_CRC(APE_INFO) (((APE_INFO)->GetInfo(APE_INFO_FORMAT_FLAGS) & MAC_FORMAT_FLAG_CRC) ? TRUE : FALSE)
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#define GET_FRAMES_START_ON_BYTES_BOUNDARIES(APE_INFO) (((APE_INFO)->GetInfo(APE_INFO_FILE_VERSION) > 3800) ? TRUE : FALSE)
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#define GET_USES_SPECIAL_FRAMES(APE_INFO) (((APE_INFO)->GetInfo(APE_INFO_FILE_VERSION) > 3820) ? TRUE : FALSE)
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#define GET_IO(APE_INFO) ((CIO *) (APE_INFO)->GetInfo(APE_INFO_IO_SOURCE))
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#define GET_TAG(APE_INFO) ((CAPETag *) (APE_INFO)->GetInfo(APE_INFO_TAG))
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/*****************************************************************************************
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CAPEInfo class... use this for all work with APE files
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*****************************************************************************************/
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class CAPEInfo
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{
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public:
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// construction and destruction
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CAPEInfo(int * pErrorCode, const char * pFilename, CAPETag * pTag = NULL);
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CAPEInfo(int * pErrorCode, CIO *pIO, CAPETag * pTag = NULL);
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virtual ~CAPEInfo();
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// query for information
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int GetInfo(APE_DECOMPRESS_FIELDS Field, int nParam1 = 0, int nParam2 = 0);
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private:
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// internal functions
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int GetFileInformation(BOOL bGetTagInformation = TRUE);
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int CloseFile();
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int SkipToAPEHeader();
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// internal variables
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BOOL m_bHasFileInformationLoaded;
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CSmartPtr<CIO> m_spIO;
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CSmartPtr<CAPETag> m_spAPETag;
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CSmartPtr<unsigned char> m_spWaveHeaderData;
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CSmartPtr<unsigned __int32> m_spSeekByteTable;
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CSmartPtr<unsigned char> m_spSeekBitTable;
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int m_nExtraHeaderBytes; //used for ID3v2, etc.
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int m_nSeekTableElements;
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APE_FILE_INFO m_APEFileInfo;
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};
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#endif /* APE_APEINFO_H */
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