amf_msmatrix.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_MSMatrix.c#3 $ 
// Part of : VisualAudio V2.5.0 
// Updated : $Date: 2006/10/12 $ by $Author: Fernando $



#include "AMF_MSMatrix.h"

#define ONE_OVER_SQRT2 0.70710678118654752440084436210485

void AMF_MSMatrix_Render(AMF_MSMatrix * restrict instance,float * restrict * buffers,int tickSize);
void AMF_MSMatrix_Bypass(AMF_MSMatrix * 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

SEG_MOD_FAST_CODE  void AMF_MSMatrix_Render(AMF_MSMatrix * restrict instance,float * restrict * buffers,int tickSize) {
    int i;
    float *in1 = buffers[0];
    float *in2 = buffers[1];
    float *out1 = buffers[2];
    float *out2 = buffers[3];
    
    for (i=0; i<tickSize; i++) {
      out1[i]=(in1[i]+in2[i])*ONE_OVER_SQRT2;
      out2[i]=(in1[i]-in2[i])*ONE_OVER_SQRT2;
    }
}
#endif

// custom bypass
// copies inputs to outputs
#pragma optimize_for_space
SEG_MOD_FAST_CODE  void AMF_MSMatrix_Bypass(AMF_MSMatrix * restrict instance, float * restrict * buffers, int tickSize) {
 
    int i,k;
    float *monoIn;
    float *out;

    for (k=0; k<2; k++) {
        monoIn = buffers[k];
        out = buffers[k+2];
        for (i=0; i<tickSize; i++) {
            out[i] = monoIn[i];
        }
    }
}

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassMSMatrix = {
    
    /* Flags */
    0,
     
    /* Render function */
    (AMF_RenderFunction)AMF_MSMatrix_Render,

    /* Custom bypass */
    (AMF_RenderFunction)AMF_MSMatrix_Bypass,
    
    /* Input descriptor - 2 inputs, and they are mono. */
    2, 0,

    /* Output descriptor - 2 outputs, and they are mono. */
    2, 0,
};