79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#pragma once
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#include "PatternDecoder.h"
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struct IMusicSystem;
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class CPCMDecoderInstance;
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struct ICryPak;
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struct SPCMFileInfo
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{
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SPCMFileInfo()
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{
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nBytesPerSample=0;
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}
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int nBytesPerSample;
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};
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class CPCMDecoder : public IMusicPatternDecoder
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{
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protected:
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IMusicSystem *m_pMusicSystem;
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ICryPak *m_pPak;
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FILE *m_pFile;
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int m_nPosBytes; // current position (in bytes) in the file to reduce seeking-overhead
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SMusicPatternFileInfo m_FileInfo;
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SPCMFileInfo m_PCMFileInfo;
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friend class CPCMDecoderInstance;
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private:
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bool m_b44KHz; //keeps track of encoded frequency
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int ReadFile(void *pBuf, int nSize, int nCount, int *pNewFilePos=NULL);
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bool InitStreamWAV();
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protected:
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virtual ~CPCMDecoder();
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public:
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CPCMDecoder(IMusicSystem *pMusicSystem);
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void Release() { delete this; }
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//! Open a music-pattern-file.
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bool Open(const char *pszFilename);
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//! Close a music-pattern-file.
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bool Close();
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//! Retrieve file-info
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bool GetFileInfo(SMusicPatternFileInfo &FileInfo);
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//! Retrieve mem-info
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void GetMemoryUsage(class ICrySizer* pSizer);
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//! Create instance.
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IMusicPatternDecoderInstance* CreateInstance();
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//! retrieves frequency encoding
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const bool Is44KHz() const {return m_b44KHz;}
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};
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class CPCMDecoderInstance : public IMusicPatternDecoderInstance
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{
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static const unsigned int scuiEncodedBlockSize = 2048; //block size for static allocation
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protected:
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CPCMDecoder *m_pDecoder;
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int m_nPos; // position in samples
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int m_nPosBytes; // file position in bytes
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bool m_bCopyFromLastFrame; // indicates some copying from last frame (due to odd sample count request)
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signed long m_lLastSample; // sample to reuse for next frame
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private:
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bool SeekBytes(int nBytes);
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protected:
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unsigned int m_aEncodedBlock[scuiEncodedBlockSize]; //static allocated encoded block, only needed for 22 kHz mode
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//! fills a dest buffer with uncompressed data
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const bool FillPCMBuffer22KHz(signed long *pBuffer, int nSamples);
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virtual ~CPCMDecoderInstance();
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public:
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CPCMDecoderInstance(CPCMDecoder *pDecoder);
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void Release() { delete this; }
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//! Seek to beginning of pattern (if nDelay is set it will wait nDelay-samples before starting playback).
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bool Seek0(int nDelay=0);
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//! Retrieve the current position in the file (in samples)
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int GetPos();
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//! Decode and retrieve pcm-data (stereo/16bit).
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bool GetPCMData(signed long *pDataOut, int nSamples, bool bLoop=true);
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}; |