71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
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/******************************************************************************
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* CFmtConvert.h *
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*---------------*
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* Declarations of CFmtConvert class.
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*------------------------------------------------------------------------------
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* Copyright (C) 2000 Microsoft Corporation Date: 05/03/00
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* All Rights Reserved
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*
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********************************************************************** DING ***/
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#ifndef _FMTCONVERT_H_
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#define _FMTCONVERT_H_
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#include <windows.h>
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#include <mmreg.h>
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// #define FILTER_LEN_2 .0005 //(sec)
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//--- class declare
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class CFmtConvert
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{
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public:
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CFmtConvert(double dHalfFilterLen = 0.0005);
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~CFmtConvert();
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void SetInputFormat (WAVEFORMATEX* userWavFormat);
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void SetOutputFormat (WAVEFORMATEX* userWavFormat);
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HRESULT ConvertSamples (const void* pvInSamples, int iInSampleLen, void** pvOutSamples, int* iOutSampleLen);
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HRESULT FlushLastBuff (void** ppvOutSamples, int* piOutSampleLen);
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private:
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//-- mono & stereo
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HRESULT SplitStereo (short* pnInSample, int* iSamplesLen, short** pnLeftSamples, short** pnRightSamples);
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HRESULT MergeStereo (short* pnLeftSamples, short* pnRightSamples, int *iSamplesLen, short** pnOutSamples);
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HRESULT Stereo2Mono (short* pnInSample, int* iSamplesLen, short** pnOutSample);
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HRESULT Mono2Stereo (short* pnInSample, int* iSamplesLen, short** pnOutSample);
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//-- precission conversions
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double* Short2Double (short* pnIn, int iLen);
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short* Double2Short (double* pdIn, int iLen);
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//-- resample
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HRESULT Resampling (double* pdInSamples, int iInNumSamples, double *pdMemory,
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double** ppdOutSamples, int* piOutNumSamples);
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HRESULT CreateResamplingFilter (int iInSampFreq, int iOutSampFreq);
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void DeleteResamplingFilter ();
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void FindResampleFactors (int iInSampFreq, int iOutSampFreq);
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double* WindowedLowPass (double dCutOff, double dGain);
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//-- memory
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HRESULT CreateBuffers ();
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void DeleteBuffers ();
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enum BlockCntrl_t { FMTCNVT_FIRST, FMTCNVT_BLOCK, FMTCNVT_LAST };
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WAVEFORMATEX m_OutWavFormat;
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WAVEFORMATEX m_InWavFormat;
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BOOL m_fResetFilter;
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BlockCntrl_t m_eChunkStatus;
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int m_iUpFactor;
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int m_iDownFactor;
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int m_iFilterHalf;
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int m_iFilterLen;
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int m_iBuffLen;
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double m_dHalfFilterLen;
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double* m_pdFilterCoef;
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double* m_pdLeftMemory;
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double* m_pdRightMemory;
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};
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#endif
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