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



#include "AMF_MixerNxMSmoothed.h"

void AMF_MixerNxMSmoothed_Render(AMF_MixerNxMSmoothed * 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

#define EPSILON .0001

#pragma optimize_for_speed
SEG_MOD_FAST_CODE  void AMF_MixerNxMSmoothed_Render(AMF_MixerNxMSmoothed * 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 *ampsTargets = &instance->ampsTarget[0];
    float pm *ampss = &instance->amps[0];             
    float ampsSmoothing = instance->ampsSmoothing;
    float oneMinusRate = 1.0 - ampsSmoothing;
    float amps,ampsTarget;
    int outWritten;                 // Boolean
    
    for (outNum=0; outNum<outputCount; outNum++) {
        out = buffers[inputCount + outNum];
        outWritten = 0;
        for (inNum=0; inNum<inputCount; inNum++) {
            ampsTarget = ampsTargets[inNum*outputCount+outNum];
            amps = ampss[inNum*outputCount+outNum];
            if (amps > EPSILON || ampsTarget > EPSILON) {
                in = buffers[inNum];
                if (!outWritten) {
                    outWritten = 1;
                    for (i=0; i<tickSize; i++) {
                        amps = amps * oneMinusRate + ampsTarget * ampsSmoothing;
                         out[i] = in[i] * amps;
                    }
                }
            }
            ampss[inNum*outputCount+outNum] = amps;
        }
        if (!outWritten)
            for (i=0; i<tickSize; i++)
                 // Should be able to use SIMD here                       
                out[i] = 0.0;
    }
}
#endif

SEG_MOD_SLOW_CONST const AMF_ModuleVariableClass AMFClassMixerNxMSmoothed = {
    
    /* Flags */
    AMFModuleClassFlag_VARIABLE_PIN_COUNT,
     
    /* Render function */
    (AMF_RenderFunction)AMF_MixerNxMSmoothed_Render, 
    
    /* Default bypass */
    (void *)0
};