mirror of
https://github.com/ioquake/ioq3.git
synced 2024-11-10 15:21:35 +00:00
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery
|
|
File: vorbis_psy.h
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef VORBIS_PSY_H
|
|
#define VORBIS_PSY_H
|
|
|
|
#ifdef VORBIS_PSYCHO
|
|
|
|
#include "smallft.h"
|
|
#define P_BANDS 17 /* 62Hz to 16kHz */
|
|
#define NOISE_COMPAND_LEVELS 40
|
|
|
|
|
|
#define todB(x) ((x)>1e-13?log((x)*(x))*4.34294480f:-30)
|
|
#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)
|
|
|
|
/* 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))
|
|
|
|
|
|
typedef struct {
|
|
|
|
float noisewindowlo;
|
|
float noisewindowhi;
|
|
int noisewindowlomin;
|
|
int noisewindowhimin;
|
|
int noisewindowfixed;
|
|
float noiseoff[P_BANDS];
|
|
float noisecompand[NOISE_COMPAND_LEVELS];
|
|
|
|
} VorbisPsyInfo;
|
|
|
|
|
|
|
|
typedef struct {
|
|
int n;
|
|
int rate;
|
|
struct drft_lookup lookup;
|
|
VorbisPsyInfo *vi;
|
|
|
|
float *window;
|
|
float *noiseoffset;
|
|
long *bark;
|
|
|
|
} VorbisPsy;
|
|
|
|
|
|
VorbisPsy *vorbis_psy_init(int rate, int size);
|
|
void vorbis_psy_destroy(VorbisPsy *psy);
|
|
void compute_curve(VorbisPsy *psy, float *audio, float *curve);
|
|
void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord);
|
|
|
|
#endif
|
|
#endif
|