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



#include "AMF_ScalerSmoothed.h"

void AMF_ScalerSmoothed_Render(AMF_ScalerSmoothed * 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

#pragma optimize_for_speed
SEG_MOD_FAST_CODE  void AMF_ScalerSmoothed_Render(AMF_ScalerSmoothed * restrict instance,float * restrict * buffers,int tickSize) {
    int i;
    float amp = instance->amp;
    float ampTarget = instance->ampTarget;
    float ampSmoothing = instance->ampSmoothing;
    float oneMinusRate = 1.0 - ampSmoothing;
    float *in = buffers[0];
    float *out = buffers[1];

    for (i=0; i<tickSize; i++) {
        amp = amp * oneMinusRate + ampTarget * ampSmoothing;
        out[i] = in[i] * amp;
    }
    instance->amp = amp;
}
#endif


SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassScalerSmoothed =
{
    /** Flags. */
    0,

    /** Reference to render function. */
    (AMF_RenderFunction) AMF_ScalerSmoothed_Render,

    /* Default bypass */
    (void *)0,

    /* Input descriptor - 1 input, and it is mono. */
    1, 0,

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