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.
289 lines
8.3 KiB
C
289 lines
8.3 KiB
C
/* Copyright (C) 2006-2008 CSIRO, Jean-Marc Valin, Xiph.Org Foundation
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File: scal.c
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Shaped comb-allpass filter for channel decorrelation
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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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/*
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The algorithm implemented here is described in:
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* J.-M. Valin, Perceptually-Motivated Nonlinear Channel Decorrelation For
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Stereo Acoustic Echo Cancellation, Accepted for Joint Workshop on
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Handsfree Speech Communication and Microphone Arrays (HSCMA), 2008.
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http://people.xiph.org/~jm/papers/valin_hscma2008.pdf
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*/
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#include "config.h"
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#include "speex/speex_echo.h"
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#include "vorbis_psy.h"
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#include "arch.h"
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#include "os_support.h"
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#include "smallft.h"
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#include <math.h>
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#include <stdlib.h>
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#define ALLPASS_ORDER 20
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struct SpeexDecorrState_ {
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int rate;
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int channels;
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int frame_size;
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#ifdef VORBIS_PSYCHO
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VorbisPsy *psy;
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struct drft_lookup lookup;
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float *wola_mem;
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float *curve;
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#endif
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float *vorbis_win;
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int seed;
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float *y;
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/* Per-channel stuff */
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float *buff;
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float (*ring)[ALLPASS_ORDER];
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int *ringID;
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int *order;
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float *alpha;
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};
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EXPORT SpeexDecorrState *speex_decorrelate_new(int rate, int channels, int frame_size)
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{
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int i, ch;
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SpeexDecorrState *st = speex_alloc(sizeof(SpeexDecorrState));
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st->rate = rate;
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st->channels = channels;
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st->frame_size = frame_size;
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#ifdef VORBIS_PSYCHO
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st->psy = vorbis_psy_init(rate, 2*frame_size);
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spx_drft_init(&st->lookup, 2*frame_size);
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st->wola_mem = speex_alloc(frame_size*sizeof(float));
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st->curve = speex_alloc(frame_size*sizeof(float));
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#endif
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st->y = speex_alloc(frame_size*sizeof(float));
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st->buff = speex_alloc(channels*2*frame_size*sizeof(float));
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st->ringID = speex_alloc(channels*sizeof(int));
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st->order = speex_alloc(channels*sizeof(int));
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st->alpha = speex_alloc(channels*sizeof(float));
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st->ring = speex_alloc(channels*ALLPASS_ORDER*sizeof(float));
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/*FIXME: The +20 is there only as a kludge for ALL_PASS_OLA*/
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st->vorbis_win = speex_alloc((2*frame_size+20)*sizeof(float));
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for (i=0;i<2*frame_size;i++)
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st->vorbis_win[i] = sin(.5*SPEEX_PI* sin(SPEEX_PI*i/(2*frame_size))*sin(SPEEX_PI*i/(2*frame_size)) );
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st->seed = rand();
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for (ch=0;ch<channels;ch++)
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{
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for (i=0;i<ALLPASS_ORDER;i++)
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st->ring[ch][i] = 0;
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st->ringID[ch] = 0;
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st->alpha[ch] = 0;
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st->order[ch] = 10;
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}
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return st;
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}
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static float uni_rand(int *seed)
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{
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const unsigned int jflone = 0x3f800000;
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const unsigned int jflmsk = 0x007fffff;
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union {int i; float f;} ran;
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*seed = 1664525 * *seed + 1013904223;
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ran.i = jflone | (jflmsk & *seed);
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ran.f -= 1.5;
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return 2*ran.f;
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}
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static unsigned int irand(int *seed)
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{
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*seed = 1664525 * *seed + 1013904223;
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return ((unsigned int)*seed)>>16;
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}
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EXPORT void speex_decorrelate(SpeexDecorrState *st, const spx_int16_t *in, spx_int16_t *out, int strength)
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{
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int ch;
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float amount;
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if (strength<0)
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strength = 0;
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if (strength>100)
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strength = 100;
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amount = .01*strength;
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for (ch=0;ch<st->channels;ch++)
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{
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int i;
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int N=2*st->frame_size;
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float beta, beta2;
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float *x;
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float max_alpha = 0;
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float *buff;
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float *ring;
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int ringID;
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int order;
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float alpha;
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buff = st->buff+ch*2*st->frame_size;
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ring = st->ring[ch];
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ringID = st->ringID[ch];
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order = st->order[ch];
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alpha = st->alpha[ch];
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for (i=0;i<st->frame_size;i++)
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buff[i] = buff[i+st->frame_size];
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for (i=0;i<st->frame_size;i++)
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buff[i+st->frame_size] = in[i*st->channels+ch];
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x = buff+st->frame_size;
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beta = 1.-.3*amount*amount;
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if (amount>1)
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beta = 1-sqrt(.4*amount);
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else
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beta = 1-0.63246*amount;
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if (beta<0)
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beta = 0;
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beta2 = beta;
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for (i=0;i<st->frame_size;i++)
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{
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st->y[i] = alpha*(x[i-ALLPASS_ORDER+order]-beta*x[i-ALLPASS_ORDER+order-1])*st->vorbis_win[st->frame_size+i+order]
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+ x[i-ALLPASS_ORDER]*st->vorbis_win[st->frame_size+i]
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- alpha*(ring[ringID]
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- beta*ring[ringID+1>=order?0:ringID+1]);
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ring[ringID++]=st->y[i];
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st->y[i] *= st->vorbis_win[st->frame_size+i];
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if (ringID>=order)
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ringID=0;
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}
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order = order+(irand(&st->seed)%3)-1;
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if (order < 5)
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order = 5;
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if (order > 10)
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order = 10;
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/*order = 5+(irand(&st->seed)%6);*/
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max_alpha = pow(.96+.04*(amount-1),order);
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if (max_alpha > .98/(1.+beta2))
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max_alpha = .98/(1.+beta2);
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alpha = alpha + .4*uni_rand(&st->seed);
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if (alpha > max_alpha)
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alpha = max_alpha;
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if (alpha < -max_alpha)
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alpha = -max_alpha;
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for (i=0;i<ALLPASS_ORDER;i++)
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ring[i] = 0;
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ringID = 0;
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for (i=0;i<st->frame_size;i++)
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{
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float tmp = alpha*(x[i-ALLPASS_ORDER+order]-beta*x[i-ALLPASS_ORDER+order-1])*st->vorbis_win[i+order]
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+ x[i-ALLPASS_ORDER]*st->vorbis_win[i]
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- alpha*(ring[ringID]
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- beta*ring[ringID+1>=order?0:ringID+1]);
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ring[ringID++]=tmp;
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tmp *= st->vorbis_win[i];
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if (ringID>=order)
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ringID=0;
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st->y[i] += tmp;
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}
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#ifdef VORBIS_PSYCHO
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float frame[N];
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float scale = 1./N;
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for (i=0;i<2*st->frame_size;i++)
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frame[i] = buff[i];
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//float coef = .5*0.78130;
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float coef = SPEEX_PI*0.075063 * 0.93763 * amount * .8 * 0.707;
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compute_curve(st->psy, buff, st->curve);
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for (i=1;i<st->frame_size;i++)
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{
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float x1,x2;
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float gain;
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do {
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x1 = uni_rand(&st->seed);
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x2 = uni_rand(&st->seed);
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} while (x1*x1+x2*x2 > 1.);
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gain = coef*sqrt(.1+st->curve[i]);
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frame[2*i-1] = gain*x1;
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frame[2*i] = gain*x2;
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}
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frame[0] = coef*uni_rand(&st->seed)*sqrt(.1+st->curve[0]);
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frame[2*st->frame_size-1] = coef*uni_rand(&st->seed)*sqrt(.1+st->curve[st->frame_size-1]);
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spx_drft_backward(&st->lookup,frame);
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for (i=0;i<2*st->frame_size;i++)
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frame[i] *= st->vorbis_win[i];
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#endif
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for (i=0;i<st->frame_size;i++)
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{
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#ifdef VORBIS_PSYCHO
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float tmp = st->y[i] + frame[i] + st->wola_mem[i];
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st->wola_mem[i] = frame[i+st->frame_size];
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#else
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float tmp = st->y[i];
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#endif
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if (tmp>32767)
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tmp = 32767;
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if (tmp < -32767)
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tmp = -32767;
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out[i*st->channels+ch] = tmp;
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}
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st->ringID[ch] = ringID;
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st->order[ch] = order;
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st->alpha[ch] = alpha;
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}
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}
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EXPORT void speex_decorrelate_destroy(SpeexDecorrState *st)
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{
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#ifdef VORBIS_PSYCHO
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vorbis_psy_destroy(st->psy);
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speex_free(st->wola_mem);
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speex_free(st->curve);
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#endif
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speex_free(st->buff);
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speex_free(st->ring);
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speex_free(st->ringID);
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speex_free(st->alpha);
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speex_free(st->vorbis_win);
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speex_free(st->order);
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speex_free(st->y);
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speex_free(st);
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}
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