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.
227 lines
6.7 KiB
C
227 lines
6.7 KiB
C
/* Copyright (C) 2006 Jean-Marc Valin */
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/**
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@file filterbank.c
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@brief Converting between psd and filterbank
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*/
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/*
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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 are
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met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. 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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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "filterbank.h"
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#include "arch.h"
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#include <math.h>
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#include "math_approx.h"
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#include "os_support.h"
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#ifdef FIXED_POINT
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#define toBARK(n) (MULT16_16(26829,spx_atan(SHR32(MULT16_16(97,n),2))) + MULT16_16(4588,spx_atan(MULT16_32_Q15(20,MULT16_16(n,n)))) + MULT16_16(3355,n))
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#else
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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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#endif
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#define toMEL(n) (2595.f*log10(1.f+(n)/700.f))
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FilterBank *filterbank_new(int banks, spx_word32_t sampling, int len, int type)
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{
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FilterBank *bank;
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spx_word32_t df;
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spx_word32_t max_mel, mel_interval;
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int i;
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int id1;
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int id2;
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df = DIV32(SHL32(sampling,15),MULT16_16(2,len));
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max_mel = toBARK(EXTRACT16(sampling/2));
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mel_interval = PDIV32(max_mel,banks-1);
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bank = (FilterBank*)speex_alloc(sizeof(FilterBank));
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bank->nb_banks = banks;
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bank->len = len;
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bank->bank_left = (int*)speex_alloc(len*sizeof(int));
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bank->bank_right = (int*)speex_alloc(len*sizeof(int));
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bank->filter_left = (spx_word16_t*)speex_alloc(len*sizeof(spx_word16_t));
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bank->filter_right = (spx_word16_t*)speex_alloc(len*sizeof(spx_word16_t));
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/* Think I can safely disable normalisation that for fixed-point (and probably float as well) */
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#ifndef FIXED_POINT
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bank->scaling = (float*)speex_alloc(banks*sizeof(float));
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#endif
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for (i=0;i<len;i++)
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{
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spx_word16_t curr_freq;
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spx_word32_t mel;
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spx_word16_t val;
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curr_freq = EXTRACT16(MULT16_32_P15(i,df));
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mel = toBARK(curr_freq);
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if (mel > max_mel)
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break;
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#ifdef FIXED_POINT
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id1 = DIV32(mel,mel_interval);
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#else
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id1 = (int)(floor(mel/mel_interval));
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#endif
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if (id1>banks-2)
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{
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id1 = banks-2;
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val = Q15_ONE;
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} else {
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val = DIV32_16(mel - id1*mel_interval,EXTRACT16(PSHR32(mel_interval,15)));
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}
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id2 = id1+1;
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bank->bank_left[i] = id1;
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bank->filter_left[i] = SUB16(Q15_ONE,val);
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bank->bank_right[i] = id2;
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bank->filter_right[i] = val;
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}
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/* Think I can safely disable normalisation for fixed-point (and probably float as well) */
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#ifndef FIXED_POINT
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for (i=0;i<bank->nb_banks;i++)
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bank->scaling[i] = 0;
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for (i=0;i<bank->len;i++)
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{
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int id = bank->bank_left[i];
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bank->scaling[id] += bank->filter_left[i];
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id = bank->bank_right[i];
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bank->scaling[id] += bank->filter_right[i];
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}
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for (i=0;i<bank->nb_banks;i++)
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bank->scaling[i] = Q15_ONE/(bank->scaling[i]);
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#endif
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return bank;
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}
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void filterbank_destroy(FilterBank *bank)
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{
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speex_free(bank->bank_left);
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speex_free(bank->bank_right);
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speex_free(bank->filter_left);
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speex_free(bank->filter_right);
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#ifndef FIXED_POINT
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speex_free(bank->scaling);
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#endif
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speex_free(bank);
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}
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void filterbank_compute_bank32(FilterBank *bank, spx_word32_t *ps, spx_word32_t *mel)
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{
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int i;
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for (i=0;i<bank->nb_banks;i++)
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mel[i] = 0;
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for (i=0;i<bank->len;i++)
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{
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int id;
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id = bank->bank_left[i];
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mel[id] += MULT16_32_P15(bank->filter_left[i],ps[i]);
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id = bank->bank_right[i];
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mel[id] += MULT16_32_P15(bank->filter_right[i],ps[i]);
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}
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/* Think I can safely disable normalisation that for fixed-point (and probably float as well) */
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#ifndef FIXED_POINT
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/*for (i=0;i<bank->nb_banks;i++)
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mel[i] = MULT16_32_P15(Q15(bank->scaling[i]),mel[i]);
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*/
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#endif
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}
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void filterbank_compute_psd16(FilterBank *bank, spx_word16_t *mel, spx_word16_t *ps)
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{
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int i;
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for (i=0;i<bank->len;i++)
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{
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spx_word32_t tmp;
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int id1, id2;
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id1 = bank->bank_left[i];
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id2 = bank->bank_right[i];
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tmp = MULT16_16(mel[id1],bank->filter_left[i]);
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tmp += MULT16_16(mel[id2],bank->filter_right[i]);
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ps[i] = EXTRACT16(PSHR32(tmp,15));
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}
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}
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#ifndef FIXED_POINT
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void filterbank_compute_bank(FilterBank *bank, float *ps, float *mel)
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{
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int i;
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for (i=0;i<bank->nb_banks;i++)
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mel[i] = 0;
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for (i=0;i<bank->len;i++)
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{
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int id = bank->bank_left[i];
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mel[id] += bank->filter_left[i]*ps[i];
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id = bank->bank_right[i];
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mel[id] += bank->filter_right[i]*ps[i];
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}
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for (i=0;i<bank->nb_banks;i++)
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mel[i] *= bank->scaling[i];
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}
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void filterbank_compute_psd(FilterBank *bank, float *mel, float *ps)
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{
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int i;
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for (i=0;i<bank->len;i++)
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{
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int id = bank->bank_left[i];
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ps[i] = mel[id]*bank->filter_left[i];
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id = bank->bank_right[i];
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ps[i] += mel[id]*bank->filter_right[i];
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}
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}
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void filterbank_psy_smooth(FilterBank *bank, float *ps, float *mask)
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{
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/* Low freq slope: 14 dB/Bark*/
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/* High freq slope: 9 dB/Bark*/
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/* Noise vs tone: 5 dB difference */
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/* FIXME: Temporary kludge */
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float bark[100];
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int i;
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/* Assumes 1/3 Bark resolution */
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float decay_low = 0.34145f;
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float decay_high = 0.50119f;
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filterbank_compute_bank(bank, ps, bark);
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for (i=1;i<bank->nb_banks;i++)
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{
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/*float decay_high = 13-1.6*log10(bark[i-1]);
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decay_high = pow(10,(-decay_high/30.f));*/
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bark[i] = bark[i] + decay_high*bark[i-1];
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}
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for (i=bank->nb_banks-2;i>=0;i--)
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{
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bark[i] = bark[i] + decay_low*bark[i+1];
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}
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filterbank_compute_psd(bank, bark, mask);
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}
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#endif
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