amf_polynomial_ds.c

ADI SHARC DSP 音频算法标准模块库

// Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved.
// This software is proprietary and confidential to Analog Devices, Inc. and its licensors.

// File    : $Id: //depot/development/visualaudio/modules/2.5.0/SHARC/Source/AMF_Polynomial_DS.c#3 $ 
// Part of : VisualAudio V2.5.0 
// Updated : $Date: 2006/10/12 $ by $Author: Fernando $



#include "AMF_Polynomial_DS.h"
#include "VA_GeneralHelperFunctions.h"


void AMF_Polynomial_DS_Render(AMF_Polynomial_DS * restrict instance,float * restrict * buffers,int tickSize);

// NOTE: The C version of this function is for reference only (it is
//       intended just to show the general algorithm that the module
//       uses), and it may not have been fully tested
#if 0    // example C code

SEG_MOD_FAST_CODE  void AMF_Polynomial_DS_Render(AMF_Polynomial_DS * restrict instance,float * restrict * buffers,int tickSize) {
    int i, j, k;
    int numCoefs = instance->numCoefs;        // filter size
    float *coefs = &instance->coefs[0];        // filter coefs
    float *in = buffers[0];
    float *out = buffers[1];
    float x1, x2, tmp1, tmp2;

    for (i=0; i<tickSize*2; i+=2) {
        x1 = in[i];
        x2 = in[i+1];
        tmp1 = coefs[0];
        tmp2 = coefs[1];
        for (j=2; j<2*numCoefs; j+=2)
        {
            tmp1 = tmp1*x1 + coefs[j];
            tmp2 = tmp2*x2 + coefs[j+1];
        }
        out[i] = tmp1;
        out[i+1] = tmp2;
    }
}
#endif

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassPolynomial_DS = {
    
    /* Flags */
    0,
     
    /* Render function */
    (AMF_RenderFunction)AMF_Polynomial_DS_Render,  // render function 
    
    /* Default bypass */
    (void *)0,

    /* Input descriptor - 1 input, and it is stereo. */
    1, AMF_StereoPin(0),

    /* Output descriptor - 1 output, and it is stereo. */
    1, AMF_StereoPin(0)
};