/********************************************************************

 *                                                                  *

 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *

 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

 *                                                                  *

 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *

 * by the Xiph.Org Foundation https://xiph.org/                     *

 *                                                                  *

 ********************************************************************

 function: linear scale -> dB, Bark and Mel scales

 ********************************************************************/

#ifndef _V_SCALES_H_

#define _V_SCALES_H_

#include <math.h>

#include "os.h"

#ifdef _MSC_VER

/* MS Visual Studio doesn't have C99 inline keyword. */

#define inline __inline

#endif

/* 20log10(x) */

#define VORBIS_IEEE_FLOAT32 1

#ifdef VORBIS_IEEE_FLOAT32

static inline float unitnorm(float x){

  union {

    ogg_uint32_t i;

    float f;

  } ix;

  ix.f = x;

  ix.i = (ix.i & 0x80000000U) | (0x3f800000U);

  return ix.f;

}

Unexecuted instantiation: envelope.c:unitnorm

Unexecuted instantiation: lpc.c:unitnorm

Unexecuted instantiation: analysis.c:unitnorm

Unexecuted instantiation: psy.c:unitnorm

Unexecuted instantiation: codebook.c:unitnorm

Unexecuted instantiation: sharedbook.c:unitnorm

Unexecuted instantiation: floor1.c:unitnorm

Unexecuted instantiation: floor0.c:unitnorm

Unexecuted instantiation: mapping0.c:unitnorm

Unexecuted instantiation: lsp.c:unitnorm

/* Segher was off (too high) by ~ .3 decibel.  Center the conversion correctly. */

static inline float todB(const float *x){

  union {

    ogg_uint32_t i;

    float f;

  } ix;

  ix.f = *x;

  ix.i = ix.i&0x7fffffff;

  return (float)(ix.i * 7.17711438e-7f -764.6161886f);

}

Unexecuted instantiation: envelope.c:todB

Unexecuted instantiation: lpc.c:todB

Unexecuted instantiation: analysis.c:todB

Unexecuted instantiation: psy.c:todB

Unexecuted instantiation: codebook.c:todB

Unexecuted instantiation: sharedbook.c:todB

Unexecuted instantiation: floor1.c:todB

Unexecuted instantiation: floor0.c:todB

Unexecuted instantiation: mapping0.c:todB

Unexecuted instantiation: lsp.c:todB

#define todB_nn(x) todB(x)

#else

static float unitnorm(float x){

  if(x<0)return(-1.f);

  return(1.f);

}

#define todB(x)   (*(x)==0?-400.f:log(*(x)**(x))*4.34294480f)

#define todB_nn(x)   (*(x)==0.f?-400.f:log(*(x))*8.6858896f)

#endif

#define fromdB(x) (exp((x)*.11512925f))

/* The bark scale equations are approximations, since the original

   table was somewhat hand rolled.  The below are chosen to have the

   best possible fit to the rolled tables, thus their somewhat odd

   appearance (these are more accurate and over a longer range than

   the oft-quoted bark equations found in the texts I have).  The

   approximations are valid from 0 - 30kHz (nyquist) or so.

   all f in Hz, z in Bark */

#define toBARK(n)   (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))

#define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f)

#define toMEL(n)    (log(1.f+(n)*.001f)*1442.695f)

#define fromMEL(m)  (1000.f*exp((m)/1442.695f)-1000.f)

/* Frequency to octave.  We arbitrarily declare 63.5 Hz to be octave

   0.0 */

#define toOC(n)     (log(n)*1.442695f-5.965784f)

#define fromOC(o)   (exp(((o)+5.965784f)*.693147f))

#endif