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      1 /* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery
      2    File: vorbis_psy.h
      3 
      4    Redistribution and use in source and binary forms, with or without
      5    modification, are permitted provided that the following conditions
      6    are met:
      7 
      8    - Redistributions of source code must retain the above copyright
      9    notice, this list of conditions and the following disclaimer.
     10 
     11    - Redistributions in binary form must reproduce the above copyright
     12    notice, this list of conditions and the following disclaimer in the
     13    documentation and/or other materials provided with the distribution.
     14 
     15    - Neither the name of the Xiph.org Foundation nor the names of its
     16    contributors may be used to endorse or promote products derived from
     17    this software without specific prior written permission.
     18 
     19    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
     23    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     24    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     25    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     26    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     27    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     28    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     29    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 */
     31 
     32 #ifndef VORBIS_PSY_H
     33 #define VORBIS_PSY_H
     34 
     35 #ifdef VORBIS_PSYCHO
     36 
     37 #include "smallft.h"
     38 #define P_BANDS 17      /* 62Hz to 16kHz */
     39 #define NOISE_COMPAND_LEVELS 40
     40 
     41 
     42 #define todB(x)   ((x)>1e-13?log((x)*(x))*4.34294480f:-30)
     43 #define fromdB(x) (exp((x)*.11512925f))
     44 
     45 /* The bark scale equations are approximations, since the original
     46    table was somewhat hand rolled.  The below are chosen to have the
     47    best possible fit to the rolled tables, thus their somewhat odd
     48    appearance (these are more accurate and over a longer range than
     49    the oft-quoted bark equations found in the texts I have).  The
     50    approximations are valid from 0 - 30kHz (nyquist) or so.
     51 
     52    all f in Hz, z in Bark */
     53 
     54 #define toBARK(n)   (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))
     55 #define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f)
     56 
     57 /* Frequency to octave.  We arbitrarily declare 63.5 Hz to be octave
     58    0.0 */
     59 
     60 #define toOC(n)     (log(n)*1.442695f-5.965784f)
     61 #define fromOC(o)   (exp(((o)+5.965784f)*.693147f))
     62 
     63 
     64 typedef struct {
     65 
     66   float noisewindowlo;
     67   float noisewindowhi;
     68   int   noisewindowlomin;
     69   int   noisewindowhimin;
     70   int   noisewindowfixed;
     71   float noiseoff[P_BANDS];
     72   float noisecompand[NOISE_COMPAND_LEVELS];
     73 
     74 } VorbisPsyInfo;
     75 
     76 
     77 
     78 typedef struct {
     79   int n;
     80   int rate;
     81   struct drft_lookup lookup;
     82   VorbisPsyInfo *vi;
     83 
     84   float *window;
     85   float *noiseoffset;
     86   long  *bark;
     87 
     88 } VorbisPsy;
     89 
     90 
     91 VorbisPsy *vorbis_psy_init(int rate, int size);
     92 void vorbis_psy_destroy(VorbisPsy *psy);
     93 void compute_curve(VorbisPsy *psy, float *audio, float *curve);
     94 void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord);
     95 
     96 #endif
     97 #endif
     98