995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery
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File: vorbis_psy.h
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VORBIS_PSY_H
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#define VORBIS_PSY_H
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#ifdef VORBIS_PSYCHO
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#include "smallft.h"
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#define P_BANDS 17 /* 62Hz to 16kHz */
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#define NOISE_COMPAND_LEVELS 40
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#define todB(x) ((x)>1e-13?log((x)*(x))*4.34294480f:-30)
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#define fromdB(x) (exp((x)*.11512925f))
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/* The bark scale equations are approximations, since the original
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table was somewhat hand rolled. The below are chosen to have the
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best possible fit to the rolled tables, thus their somewhat odd
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appearance (these are more accurate and over a longer range than
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the oft-quoted bark equations found in the texts I have). The
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approximations are valid from 0 - 30kHz (nyquist) or so.
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all f in Hz, z in Bark */
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#define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))
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#define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f)
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/* Frequency to octave. We arbitrarily declare 63.5 Hz to be octave
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0.0 */
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#define toOC(n) (log(n)*1.442695f-5.965784f)
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#define fromOC(o) (exp(((o)+5.965784f)*.693147f))
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typedef struct {
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float noisewindowlo;
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float noisewindowhi;
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int noisewindowlomin;
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int noisewindowhimin;
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int noisewindowfixed;
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float noiseoff[P_BANDS];
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float noisecompand[NOISE_COMPAND_LEVELS];
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} VorbisPsyInfo;
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typedef struct {
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int n;
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int rate;
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struct drft_lookup lookup;
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VorbisPsyInfo *vi;
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float *window;
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float *noiseoffset;
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long *bark;
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} VorbisPsy;
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VorbisPsy *vorbis_psy_init(int rate, int size);
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void vorbis_psy_destroy(VorbisPsy *psy);
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void compute_curve(VorbisPsy *psy, float *audio, float *curve);
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void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord);
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#endif
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#endif
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