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



#include "AMF_DecibelsToLinear.h"

void AMF_DecibelsToLinear_Render(AMF_DecibelsToLinear * 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. For example,
//       the assembly version implements an approximation rather than
//       calling into the math library.
#if 0

SEG_MOD_FAST_CODE  void AMF_DecibelsToLinear_Render(AMF_DecibelsToLinear * restrict instance,float * restrict * buffers,int tickSize) {
    int i;
    float *in = buffers[0];
    float *out = buffers[1];
    
    for (i=0; i<tickSize; i++) {
      out[i]=powf(10.0f,0.05f*in[i]);
    }
}
#endif

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassDecibelsToLinear = {
    
    /* Flags */
    0,
     
    /* Render function */
    (AMF_RenderFunction)AMF_DecibelsToLinear_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,
};