raresampler.cpp

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

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
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 * ***** END LICENSE BLOCK ***** */ 

#include "hlxclib/string.h" // memcpy

#include "RAResampler.h"
#include "allresamplers.h"
#include "cpuident.h"


static void cvtShortShortSimple(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    memcpy(d,s,n*sizeof(short)) ; /* Flawfinder: ignore */
}

static void cvtFloatFloatSimple(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    memcpy(d,s,n*sizeof(float)) ; /* Flawfinder: ignore */
}

static void cvtIntFloatSimple(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    int i ;
    const int* src = (const int*)s ;
    float* dst = (float*)d ;
    for (i = 0 ; i < n ; i++)
        *dst++ = (1.0f/65536.0f)*(float)*src++ ;
}

static void cvtIntShortSimple(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    int i ;
    const int* src = (const int*)s ;
    short* dst = (short*)d ;
    for (i = 0 ; i < n ; i++)
    {
        int t = *src++ ;
        if (t < 0x7fff8000L) t += 0x8000L ; // rounding
        *dst++ = (short)(t >> 16);
    }
}

static void cvtShortFloatSimple(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    int i ;
    const short* src = (const short*)s ;
    float* dst = (float*)d ;
    for (i = 0 ; i < n ; i++)
        *dst++ = (float)*src++ ;
}

// generic convert functions for multichannel operation

static int cvtShortShort(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    const short* src = (const short *)s ;
    const short* srcEnd = src + n ;
    short* dst = (short *)d ;

    while (src != srcEnd)
    {
        *dst = *src ;
        src += pState->incInput ;
        dst += pState->incOutput ;
        pState = pState->pNext ;
    }

    return dst - (short *)d ;
}

static int cvtFloatFloat(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    const float* src = (const float *)s ;
    const float* srcEnd = src + n ;
    float* dst = (float *)d ;

    while (src != srcEnd)
    {
        *dst = *src ;
        src += pState->incInput ;
        dst += pState->incOutput ;
        pState = pState->pNext ;
    }

    return dst - (float *)d ;
}

static int cvtIntFloat(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    const int* src = (const int *)s ;
    const int* srcEnd = src + n ;
    float* dst = (float *)d ;

    while (src != srcEnd)
    {
        *dst = (1.0f/65536.0f) * (*src) ;
        src += pState->incInput ;
        dst += pState->incOutput ;
        pState = pState->pNext ;
    }
    return dst - (float *)d ;
}

static int cvtIntShort(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    const int* src = (const int *)s ;
    const int* srcEnd = src + n ;
    short* dst = (short *)d ;

    while (src != srcEnd)
    {
        int t = (int)(*src) ;
        if (t < 0x7fff8000L) t += 0x8000L ; // rounding
        *dst = (short)(t >> 16) ;
        src += pState->incInput ;
        dst += pState->incOutput ;
        pState = pState->pNext ;
    }
    return dst - (short *)d ;
}

static int cvtShortFloat(void *d, const void *s, int n, const struct CVTSTATEMACHINE *pState)
{
    const short* src = (const short *)s ;
    const short* srcEnd = src + n ;
    float* dst = (float *)d ;

    while (src != srcEnd)
    {
        *dst = (float)(*src) ;
        src += pState->incInput ;
        dst += pState->incOutput ;
        pState = pState->pNext ;
    }

    return dst - (float *)d ;
}


typedef int  (*tfResample)(void *inbuf, int insamps, tConverter *pCvt, short *outbuf, int outstride, void *inst);
typedef void* (*tfInitResamplerCopy)(int nchans, const void *inst);
typedef void (*tfFreeResampler)(void *inst);
typedef int  (*tfGetDelay)(void *inst);
typedef int  (*tfGetDelay)(void *inst);
typedef int  (*tfGetMinInput)(int nSamples, void *inst);
typedef int  (*tfGetMaxOutput)(int nSamples, void *inst);

static cvtFunctionType const cvtFunc[3][3] = {
    {cvtShortShort,0,cvtShortFloat},
    {cvtIntShort,  0,cvtIntFloat},
    {0,            0,cvtFloatFloat}
} ;

RAExactResampler::RAExactResampler() {}
RAExactResampler::~RAExactResampler() {}

class RAAnyResampler : public RAExactResampler
{
public:

    int Resample(void *_inbuf, int insamps, signed short *outbuf) ;
    int Resample(void *_inbuf, int insamps, signed int *outbuf) ;

    int GetMinInput(int insamps)
    {
        int t = insamps / m_nChannelsTotal * m_nChannels[0] ;
        t = m_pfGetMinInput(t, m_pResampler[0]) ;
        return t / m_nChannels[0] * m_nChannelsTotal ;
    }

    int GetMaxOutput(int insamps)
    {
        int t = insamps / m_nChannelsTotal * m_nChannels[0] ;
        t = m_pfGetMaxOutput(t, m_pResampler[0]) ;
        return t / m_nChannels[0] * m_nChannelsTotal ;
    }

    int GetDelay()
    {
        return m_pfGetDelay(m_pResampler[0]) ;
    }

protected:
    RAAnyResampler() ;
    virtual ~RAAnyResampler();

    /*
     * function pointers
     */
    tfResample      m_pfResample[2] ; // one for mono, one for stereo
    tfGetMinInput   m_pfGetMinInput ;
    tfGetMaxOutput  m_pfGetMaxOutput ;
    tfGetDelay      m_pfGetDelay ;
    tfFreeResampler m_pfFreeResampler ;
    tfInitResamplerCopy m_pfInitResamplerCopy ;
    tConverter m_converter[2] ; // one for mono, one for stereo

    int intype, resType;

    enum {
        MAX_RESAMPLERS = 5
    } ;

    int m_nResamplers ;
    int m_nBytesPerSampleIn ;
    int m_nChannelsTotal ;
    void *m_pResampler[MAX_RESAMPLERS] ;
    int m_nChannels[MAX_RESAMPLERS] ;
    int m_nBlock[MAX_RESAMPLERS] ;
    int m_nOffsetIn[MAX_RESAMPLERS] ;

    HX_RESULT Init(int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain) ;

    // these need to be supplied by the base classes
    virtual int GetResamplerInputType(void) = 0 ;
    virtual HX_RESULT SetupFunctionPointers(void) = 0 ;
    virtual void* InitResampler(int inrate, int outrate, int nchans, float atten, float passband, float stopband, float dcgain) = 0;

private:
    HX_RESULT SetupNumChannels(int chans) ;
    HX_RESULT SetupConverter(int intype, int restype) ;
} ;

RAAnyResampler::RAAnyResampler()
: m_nResamplers(0)
{
    memset(m_pResampler, 0, sizeof(m_pResampler)) ;
}

HX_RESULT RAAnyResampler::Init(int inrate, int outrate, int chans, int intype, float atten, float passband, float stopband, float dcgain)
{
    HX_RESULT res = HXR_OK ;
    int i ;

    if (SUCCEEDED(res))
        res = SetupFunctionPointers() ;

    if (SUCCEEDED(res))
        res = SetupNumChannels(chans) ;

    m_converter[0].pStateMachine = 0 ;
    m_converter[1].pStateMachine = 0 ;
    if (SUCCEEDED(res))
        res = SetupConverter(intype, GetResamplerInputType()) ;

    for (i = 0 ; i < m_nResamplers; i++)
    {
        m_pResampler[i] = 0 ;
        if (SUCCEEDED(res))
        {
            if (i == 0)
                m_pResampler[i] = InitResampler(inrate, outrate, m_nChannels[i],  atten, passband, stopband, dcgain) ;
            else
                m_pResampler[i] = m_pfInitResamplerCopy(m_nChannels[i], m_pResampler[0]) ;
        }

        if (!m_pResampler[i])
            res = HXR_OUTOFMEMORY ;
    }

    return res ;
}

RAAnyResampler::~RAAnyResampler()
{
    int i ;
    for (i = 0 ; i < MAX_RESAMPLERS ; i++)
    {
        if (m_pResampler[i]) m_pfFreeResampler(m_pResampler[i]) ;
        m_pResampler[i] = 0; // paranoia code.
    }
    HX_VECTOR_DELETE(m_converter[0].pStateMachine) ;
    HX_VECTOR_DELETE(m_converter[1].pStateMachine) ;
}

HX_RESULT RAAnyResampler::SetupNumChannels(int chans)
{
    int i ;

    if (chans > 2*MAX_RESAMPLERS)
        return HXR_FAIL ;

    m_nChannelsTotal = chans ;
    m_nResamplers = 0 ;
    for (i = 0 ; i < chans ; i+=2)
    {
        m_nChannels[m_nResamplers] = (i + 2 > chans) ? 1 : 2 ;
        m_nBlock[m_nResamplers] = NBLOCK - NBLOCK % m_nChannels[m_nResamplers] ;
        m_nOffsetIn[m_nResamplers] = 2 * m_nResamplers ;
        m_nResamplers++ ;
    }

    return HXR_OK ;
}

HX_RESULT RAAnyResampler::SetupConverter(int _intype, int _restype)
{
    static const int bps[] = {2,4,4} ;