raresampler.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

    intype = _intype;
    resType = _restype ;
    m_converter[0].pfCvt         = cvtFunc[intype][resType] ;
    m_converter[1].pfCvt         = cvtFunc[intype][resType] ;
    m_converter[0].pStateMachine = new struct CVTSTATEMACHINE[1] ;
    m_converter[1].pStateMachine = new struct CVTSTATEMACHINE[2] ;

    // mono converter
    m_converter[0].pStateMachine[0].pNext = m_converter[0].pStateMachine ;
    m_converter[0].pStateMachine[0].incInput = m_nChannelsTotal ;
    m_converter[0].pStateMachine[0].incOutput = 1 ;

    // stereo converter
    m_converter[1].pStateMachine[0].pNext = &(m_converter[1].pStateMachine[1]) ;
    m_converter[1].pStateMachine[0].incInput = 1 ;
    m_converter[1].pStateMachine[0].incOutput = 1 ;
    m_converter[1].pStateMachine[1].pNext = &(m_converter[1].pStateMachine[0]) ;
    m_converter[1].pStateMachine[1].incInput = m_nChannelsTotal - 1 ;
    m_converter[1].pStateMachine[1].incOutput = 1 ;

    m_nBytesPerSampleIn = bps[intype] ;

    return HXR_OK ;
}

int RAAnyResampler::Resample(void *_inbuf, int _insamps, signed short *_outbuf)
{
    int i ;
    int outsamps ;

    for (i = 0 ; i < m_nResamplers; i++)
    {
        int insamps = _insamps ;
        int nChannels = m_nChannels[i] ;
        char* inbuf = (char*)_inbuf + m_nOffsetIn[i] * m_nBytesPerSampleIn ;
        signed short* outbuf = _outbuf + m_nOffsetIn[i] ;
        outsamps = 0 ;
        while (insamps)
        {
            int nin = min(insamps, m_nBlock[i]);
            int nout = m_pfResample[nChannels-1](inbuf, nin, &m_converter[nChannels-1], outbuf, m_nChannelsTotal, m_pResampler[i]);
            inbuf    += nin * m_nBytesPerSampleIn ;
            insamps  -= nin;
            outbuf   += nout;
            outsamps += nout;
        }
    }

    return outsamps;
}

int RAAnyResampler::Resample(void *_inbuf, int _insamps, signed int *_outbuf)
{
    // fake it!
    int outsamps = Resample(_inbuf, _insamps, (signed short*) _outbuf) ;

    for (int j=outsamps-1; j>=0; --j)
    {
      _outbuf[j] = ((signed short*)_outbuf)[j] << 16 ;
    }

    return outsamps;
}

/*
 * Arbitrary resampler -- any rate to any rate
 */

class RAArbitraryResampler : public RAAnyResampler
{
public:
    static HX_RESULT Create(RAExactResampler **pRes, int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
    {
        HX_RESULT res = HXR_OK ;

        RAArbitraryResampler *pr = new RAArbitraryResampler() ;
        if (!pr)
            res = HXR_OUTOFMEMORY ;

        if (SUCCEEDED(res))
            res = pr->Init(inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;

        if (FAILED(res))
        {
            delete pr ; pr = 0 ;
        }

        *pRes = pr ;
        return res ;
    }

    HX_RESULT SetupFunctionPointers(void)
    {
        m_pfResample[0] = &RAResampleMonoArb ; m_pfResample[1] = &RAResampleStereoArb ;
        m_pfGetMaxOutput = &RAGetMaxOutputArb ; m_pfGetMinInput = &RAGetMinInputArb ;
        m_pfGetDelay = &RAGetDelayArb ; m_pfFreeResampler = &RAFreeResamplerArb ;
        m_pfInitResamplerCopy = &RAInitResamplerCopyArb;

        return HXR_OK ;
    }

    int GetResamplerInputType(void) {return _FLOAT; }

    void* InitResampler(int inrate, int outrate, int nchans, float atten, float passband, float stopband, float dcgain)
    {
        return RAInitResamplerArb(inrate, outrate, nchans, atten, passband, stopband, dcgain) ;
    }
} ;

/*
 * Rational resampler -- many rates to many rates, as long as the fraction
 * inrate/outrate is reducible to "small numbers"
 */

class RARationalResampler : public RAAnyResampler
{
public:
    static HX_RESULT Create(RAExactResampler **pRes, int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
    {
        HX_RESULT res = HXR_OK ;

        RARationalResampler *pr = new RARationalResampler() ;
        if (!pr)
            res = HXR_OUTOFMEMORY ;

        if (SUCCEEDED(res))
            res = pr->Init(inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;

        if (FAILED(res))
        {
            delete pr ; pr = 0 ;
        }

        *pRes = pr ;
        return res ;
    }

    int GetResamplerInputType(void) {return _FLOAT; }

    HX_RESULT SetupFunctionPointers(void)
    {
        m_pfResample[0] = &RAResampleMonoRat ; m_pfResample[1] = &RAResampleStereoRat ;
        m_pfGetMaxOutput = &RAGetMaxOutputRat ; m_pfGetMinInput = &RAGetMinInputRat ;
        m_pfGetDelay = &RAGetDelayRat ; m_pfFreeResampler = &RAFreeResamplerRat ;
        m_pfInitResamplerCopy = &RAInitResamplerCopyRat;
        return HXR_OK ;
    }

    void* InitResampler(int inrate, int outrate, int nchans, float atten, float passband, float stopband, float dcgain)
    {
        return RAInitResamplerRat(inrate, outrate, nchans, atten, passband, stopband, dcgain) ;
    }
} ;

#if defined(_M_IX86) /* || defined(__i386__) */ /* no unix mmx code yet */

class RAMMXResampler : public RAAnyResampler
{
public:
    static HX_RESULT Create(RAExactResampler **pRes, int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
    {
        HX_RESULT res = HXR_OK ;

        RAMMXResampler *pr = new RAMMXResampler() ;
        if (!pr)
            res = HXR_OUTOFMEMORY ;

        if (SUCCEEDED(res))
            res = pr->Init(inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;

        if (FAILED(res))
        {
            delete pr ; pr = 0 ;
        }

        *pRes = pr ;
        return res ;
    }

    int GetResamplerInputType(void) {return _INT16; }

    HX_RESULT SetupFunctionPointers(void)
    {
        m_pfResample[0]  = &RAResampleMonoMMX ; m_pfResample[1] = &RAResampleStereoMMX ;
        m_pfGetMaxOutput = &RAGetMaxOutputMMX ; m_pfGetMinInput = &RAGetMinInputMMX ;
        m_pfGetDelay     = &RAGetDelayMMX ;   m_pfFreeResampler = &RAFreeResamplerMMX ;
        m_pfInitResamplerCopy = &RAInitResamplerCopyMMX;
        return HXR_OK ;
    }

    void* InitResampler(int inrate, int outrate, int nchans, float atten, float passband, float stopband, float dcgain)
    {
        // should maybe check for atten etc.
        return RAInitResamplerMMX(inrate, outrate, nchans) ;
    }
} ;

#endif /* defined(_M_IX86) */

#if defined(HELIX_CONFIG_FIXEDPOINT)
class RAHermiteResampler : public RAAnyResampler
{
public:
    static HX_RESULT Create(RAExactResampler **pRes, int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
    {
        HX_RESULT res = HXR_OK ;

        /* intype must be _INT16 for the Hermite resampler */
        if (intype != _INT16 || chans > 2)
            return HXR_FAIL ;

        RAHermiteResampler *pr = new RAHermiteResampler() ;
        if (!pr)
            res = HXR_OUTOFMEMORY ;

        if (SUCCEEDED(res))
            res = pr->Init(inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;

        if (FAILED(res))
        {
            delete pr ; pr = 0 ;
        }

        *pRes = pr ;
        return res ;
    }

    int GetResamplerInputType(void) {return _INT16; }

    HX_RESULT SetupFunctionPointers(void)
    {
        m_pfResample[0]  = &RAResampleMonoHermite ; m_pfResample[1] = &RAResampleStereoHermite ;
        m_pfGetMaxOutput = &RAGetMaxOutputHermite ; m_pfGetMinInput = &RAGetMinInputHermite ;
        m_pfGetDelay     = &RAGetDelayHermite ;   m_pfFreeResampler = &RAFreeResamplerHermite ;
        m_pfInitResamplerCopy = &RAInitResamplerCopyHermite;
        return HXR_OK ;
    }

    void* InitResampler(int inrate, int outrate, int nchans, float atten, float passband, float stopband, float dcgain)
    {
        // should maybe check for atten etc.
        return RAInitResamplerHermite(inrate, outrate, nchans) ;
    }
};
#endif /* defined(HELIX_CONFIG_FIXEDPOINT) */

HX_RESULT RAExactResampler::Create(RAExactResampler** pRes, int inrate, int outrate, int chans, int intype, int quality)
{
    float dcgain   = DEF_DCGAIN ;
    float atten    ;
    float passband ;
    float stopband ;

    switch(quality)
    {
    case qualityVeryLow:
        passband = 0.77f ; // 32 tap
        stopband = 1.09f ;
        atten    = 80.0f ;
        break ;
    case qualityLow:
        passband = 0.82f ; // 48 tap
        stopband = 1.05f ;
        atten    = 85.0f ;
        break ;
    case qualityMedium:
        passband = 0.85f ; // 64 tap
        stopband = 1.03f ;
        atten    = 90.0f ;
        break ;
    case qualityHigh:
        passband = 0.88f ; // 96 tap
        stopband = 1.00f ;
        atten    = 90.0f ;
        break ;
    case qualityHyper:
        passband = 0.904f ; // 128 tap
        stopband = 1.000f ;
        atten    = 96.00f ;
        break ;
    default:
        return HXR_INVALID_PARAMETER ;
    }

    return Create(pRes, inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;
}

HX_RESULT RAExactResampler::Create(RAExactResampler** pRes, int inrate, int outrate, int chans, int intype, float atten, float trans, float dcgain)
{
    return Create(pRes, inrate, outrate, chans, intype, atten, 1.0f-trans, 1.0f, dcgain) ;
}

HX_RESULT RAExactResampler::Create(RAExactResampler** pRes, int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
{
    HX_RESULT res = HXR_FAIL ;

#if defined (HELIX_CONFIG_FIXEDPOINT)
    if (FAILED(res))
        res = RAHermiteResampler::Create(pRes, inrate, outrate, chans, intype, atten, passband, stopband, dcgain);
#else

    /* only instantiate the MMX resampler if we are compiling on an x86 architecture
       and running on a machine with MMX */
#if defined(_M_IX86) /* || defined(__i386__) */ /* no unix mmx code yet */
    
    CPUInformation info ;
    CPUIdentify(&info) ;

    /* don't use the MMX resampler if the quality is "hyper" */
    if (atten <= 90.0 &&
        info.architecture == ulArchitectureIntel &&
        info.specific.m_x86.hasMMX)
    {
        res = RAMMXResampler::Create(pRes, inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;
    }
#endif

    if (FAILED(res))
    {
        res = RARationalResampler::Create(pRes, inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;
    }

    if (FAILED(res))
    {
        res = RAArbitraryResampler::Create(pRes, inrate, outrate, chans, intype, atten, passband, stopband, dcgain) ;
    }
#endif /*HELIX_CONFIG_FIXEDPOINT*/
    return res ;
}