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