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



#include "AMF_MixerNxM_DS.h"

void AMF_MixerNxM_DS_Render(AMF_MixerNxM_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 code

#define EPSILON .0001

#pragma optimize_for_speed
SEG_MOD_FAST_CODE  void AMF_MixerNxM_DS_Render(AMF_MixerNxM_DS * restrict instance,float * restrict * buffers,int tickSize) {
    int i;
    int inputCount = instance->b.numInputs;
    int outputCount = instance->b.numOutputs;
    int outNum,inNum;
    float * restrict in;
    float * restrict out;
    float pm *amps = &instance->amps[0]; 
    float amp;
    int outWritten; // Boolean

    for (outNum=0; outNum<outputCount; outNum++) {
        out = buffers[inputCount + outNum];
        outWritten = 0;
        for (inNum=0; inNum<inputCount; inNum++) {
            amp0 = amps[2*(inNum*outputCount+outNum)];
            amp1 = amps[2*(inNum*outputCount+outNum)+1];
            if (amp0 > EPSILON || amp1 > EPSILON) {
                in = buffers[inNum];
                if (!outWritten) {
                    outWritten = 1;
                    for (i=0; i<tickSize*2; i+=2) 
                         // Should be able to use SIMD here                       
                         out[i]   = in[i]   * amp0;
                         out[i+1] = in[i+1] * amp1;
                }
                else 
                    for (i=0; i<tickSize*2; i+=2) 
                         // Should be able to use SIMD here                       
                         out[i]   += in[i]   * amp0;
                         out[i+1] += in[i+1] * amp1;
            }
        }
        if (!outWritten)
            for (i=0; i<tickSize*2; i++)
                 // Should be able to use SIMD here                       
                out[i] = 0.0;
    }
}
#endif

/*
 * Module baseclass structure describing the module environment.
 */
SEG_MOD_SLOW_CONST const AMF_ModuleVariableClass AMFClassMixerNxM_DS = {
    
    /* Flags */
    AMFModuleClassFlag_VARIABLE_PIN_COUNT,
     
    /* Render function */
    (AMF_RenderFunction)AMF_MixerNxM_DS_Render, 
    
    /* Default bypass */
    (void *)0
};