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



#include "AMF_TestGenSineSweep.h"
#include <math.h>

void AMF_TestGenSineSweep_Render(AMF_TestGenSineSweep * restrict instance,float * restrict * buffers,int tickSize);

SEG_MOD_FAST_CODE  void AMF_TestGenSineSweep_Render(AMF_TestGenSineSweep * restrict instance,float * restrict * buffers,int tickSize) {
    int i;
    float *out = buffers[0];
    float phaseInc, phase, startInc, endInc, incRatio;
    int repeatPeriod, repeatCounter;

    phase = instance->phase;
    phaseInc = instance->phaseInc;
    startInc = instance->startInc;
    endInc = instance->endInc;
    incRatio = instance->incRatio;
    repeatCounter = instance->repeatCounter;
    repeatPeriod = instance->repeatPeriod;

    if (phaseInc == 0) phaseInc = startInc;
    
    for (i=0; i<tickSize; i++) {
        // if we cross past endinc, the sweep is finished, get ready to repeat
        if ((incRatio > 1.0 && phaseInc > endInc) || (incRatio < 1.0 && phaseInc < endInc))
        {
            out[i] = 0.0;
            if (repeatPeriod == 0)
            {
                repeatCounter = repeatPeriod;
                phase = 0;
                phaseInc = startInc;
            }
        } else
        {
            if (phase > (2*3.141592653589793)) phase -= (2*3.141592653589793);
            if (phase < 0) phase += (2*3.141592653589793);
            out[i]=sinf(phase);
            phase += phaseInc;
        }
        phaseInc *= incRatio;
        if (repeatPeriod > 0)
            repeatCounter--;
        if (repeatCounter <= 0)
        {
            repeatCounter = repeatPeriod;
            phase = 0;
            phaseInc = startInc;
        }
    }
    instance->phase = phase;
    instance->phaseInc = phaseInc;
    instance->repeatCounter = repeatCounter;
}

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassTestGenSineSweep = {
    
    /* Flags */
    0,
     
    /* Render function */
    (AMF_RenderFunction)AMF_TestGenSineSweep_Render,

    /* Default bypass */
    (void *)0,
    
    /* Input descriptor - no inputs. */
    0, 0,

    /* Output descriptor - 1 output, and it is mono. */
    1, 0,
};