godot/thirdparty/libvorbis/masking.h

/********************************************************************
 *                                                                  *
 * 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: masking curve data for psychoacoustics

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

#ifndef _V_MASKING_H_
#define _V_MASKING_H_

/* more detailed ATH; the bass if flat to save stressing the floor
   overly for only a bin or two of savings. */

#define MAX_ATH …
static const float ATH[]= …;

/* The tone masking curves from Ehmer's and Fielder's papers have been
   replaced by an empirically collected data set.  The previously
   published values were, far too often, simply on crack. */

#define EHMER_OFFSET …
#define EHMER_MAX …

/* masking tones from -50 to 0dB, 62.5 through 16kHz at half octaves
   test tones from -2 octaves to +5 octaves sampled at eighth octaves */
/* (Vorbis 0dB, the loudest possible tone, is assumed to be ~100dB SPL
   for collection of these curves) */

static const float tonemasks[P_BANDS][6][EHMER_MAX]= …;

#endif