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+/* Copyright (C) 2006-2008 CSIRO, Jean-Marc Valin, Xiph.Org Foundation
+
+   File: scal.c
+   Shaped comb-allpass filter for channel decorrelation
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are
+   met:
+
+   1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+   2. 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.
+
+   3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+*/
+
+/*
+The algorithm implemented here is described in:
+
+* J.-M. Valin, Perceptually-Motivated Nonlinear Channel Decorrelation For 
+  Stereo Acoustic Echo Cancellation, Accepted for Joint Workshop on 
+  Hands­free Speech Communication and Microphone Arrays (HSCMA), 2008.
+  http://people.xiph.org/~jm/papers/valin_hscma2008.pdf
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "speex/speex_echo.h"
+#include "vorbis_psy.h"
+#include "arch.h"
+#include "os_support.h"
+#include "smallft.h"
+#include <math.h>
+#include <stdlib.h>
+
+#define ALLPASS_ORDER 20
+
+struct SpeexDecorrState_ {
+   int rate;
+   int channels;
+   int frame_size;
+#ifdef VORBIS_PSYCHO
+   VorbisPsy *psy;
+   struct drft_lookup lookup;
+   float *wola_mem;
+   float *curve;
+#endif
+   float *vorbis_win;
+   int    seed;
+   float *y;
+   
+   /* Per-channel stuff */
+   float *buff;
+   float (*ring)[ALLPASS_ORDER];
+   int *ringID;
+   int *order;
+   float *alpha;
+};
+
+
+
+EXPORT SpeexDecorrState *speex_decorrelate_new(int rate, int channels, int frame_size)
+{
+   int i, ch;
+   SpeexDecorrState *st = speex_alloc(sizeof(SpeexDecorrState));
+   st->rate = rate;
+   st->channels = channels;
+   st->frame_size = frame_size;
+#ifdef VORBIS_PSYCHO
+   st->psy = vorbis_psy_init(rate, 2*frame_size);
+   spx_drft_init(&st->lookup, 2*frame_size);
+   st->wola_mem = speex_alloc(frame_size*sizeof(float));
+   st->curve = speex_alloc(frame_size*sizeof(float));
+#endif
+   st->y = speex_alloc(frame_size*sizeof(float));
+
+   st->buff = speex_alloc(channels*2*frame_size*sizeof(float));
+   st->ringID = speex_alloc(channels*sizeof(int));
+   st->order = speex_alloc(channels*sizeof(int));
+   st->alpha = speex_alloc(channels*sizeof(float));
+   st->ring = speex_alloc(channels*ALLPASS_ORDER*sizeof(float));
+   
+   /*FIXME: The +20 is there only as a kludge for ALL_PASS_OLA*/
+   st->vorbis_win = speex_alloc((2*frame_size+20)*sizeof(float));
+   for (i=0;i<2*frame_size;i++)
+      st->vorbis_win[i] = sin(.5*M_PI* sin(M_PI*i/(2*frame_size))*sin(M_PI*i/(2*frame_size)) );
+   st->seed = rand();
+   
+   for (ch=0;ch<channels;ch++)
+   {
+      for (i=0;i<ALLPASS_ORDER;i++)
+         st->ring[ch][i] = 0;
+      st->ringID[ch] = 0;
+      st->alpha[ch] = 0;
+      st->order[ch] = 10;
+   }
+   return st;
+}
+
+static float uni_rand(int *seed)
+{
+   const unsigned int jflone = 0x3f800000;
+   const unsigned int jflmsk = 0x007fffff;
+   union {int i; float f;} ran;
+   *seed = 1664525 * *seed + 1013904223;
+   ran.i = jflone | (jflmsk & *seed);
+   ran.f -= 1.5;
+   return 2*ran.f;
+}
+
+static unsigned int irand(int *seed)
+{
+   *seed = 1664525 * *seed + 1013904223;
+   return ((unsigned int)*seed)>>16;
+}
+
+
+EXPORT void speex_decorrelate(SpeexDecorrState *st, const spx_int16_t *in, spx_int16_t *out, int strength)
+{
+   int ch;
+   float amount;
+   
+   if (strength<0)
+      strength = 0;
+   if (strength>100)
+      strength = 100;
+   
+   amount = .01*strength;
+   for (ch=0;ch<st->channels;ch++)
+   {
+      int i;
+      int N=2*st->frame_size;
+      float beta, beta2;
+      float *x;
+      float max_alpha = 0;
+      
+      float *buff;
+      float *ring;
+      int ringID;
+      int order;
+      float alpha;
+
+      buff = st->buff+ch*2*st->frame_size;
+      ring = st->ring[ch];
+      ringID = st->ringID[ch];
+      order = st->order[ch];
+      alpha = st->alpha[ch];
+      
+      for (i=0;i<st->frame_size;i++)
+         buff[i] = buff[i+st->frame_size];
+      for (i=0;i<st->frame_size;i++)
+         buff[i+st->frame_size] = in[i*st->channels+ch];
+
+      x = buff+st->frame_size;
+      beta = 1.-.3*amount*amount;
+      if (amount>1)
+         beta = 1-sqrt(.4*amount);
+      else
+         beta = 1-0.63246*amount;
+      if (beta<0)
+         beta = 0;
+   
+      beta2 = beta;
+      for (i=0;i<st->frame_size;i++)
+      {
+         st->y[i] = alpha*(x[i-ALLPASS_ORDER+order]-beta*x[i-ALLPASS_ORDER+order-1])*st->vorbis_win[st->frame_size+i+order] 
+               + x[i-ALLPASS_ORDER]*st->vorbis_win[st->frame_size+i] 
+               - alpha*(ring[ringID]
+               - beta*ring[ringID+1>=order?0:ringID+1]);
+         ring[ringID++]=st->y[i];
+         st->y[i] *= st->vorbis_win[st->frame_size+i];
+         if (ringID>=order)
+            ringID=0;
+      }
+      order = order+(irand(&st->seed)%3)-1;
+      if (order < 5)
+         order = 5;
+      if (order > 10)
+         order = 10;
+      /*order = 5+(irand(&st->seed)%6);*/
+      max_alpha = pow(.96+.04*(amount-1),order);
+      if (max_alpha > .98/(1.+beta2))
+         max_alpha = .98/(1.+beta2);
+   
+      alpha = alpha + .4*uni_rand(&st->seed);
+      if (alpha > max_alpha)
+         alpha = max_alpha;
+      if (alpha < -max_alpha)
+         alpha = -max_alpha;
+      for (i=0;i<ALLPASS_ORDER;i++)
+         ring[i] = 0;
+      ringID = 0;
+      for (i=0;i<st->frame_size;i++)
+      {
+         float tmp =  alpha*(x[i-ALLPASS_ORDER+order]-beta*x[i-ALLPASS_ORDER+order-1])*st->vorbis_win[i+order] 
+               + x[i-ALLPASS_ORDER]*st->vorbis_win[i] 
+               - alpha*(ring[ringID]
+               - beta*ring[ringID+1>=order?0:ringID+1]);
+         ring[ringID++]=tmp;
+         tmp *= st->vorbis_win[i];
+         if (ringID>=order)
+            ringID=0;
+         st->y[i] += tmp;
+      }
+   
+#ifdef VORBIS_PSYCHO
+      float frame[N];
+      float scale = 1./N;
+      for (i=0;i<2*st->frame_size;i++)
+         frame[i] = buff[i];
+   //float coef = .5*0.78130;
+      float coef = M_PI*0.075063 * 0.93763 * amount * .8 * 0.707;
+      compute_curve(st->psy, buff, st->curve);
+      for (i=1;i<st->frame_size;i++)
+      {
+         float x1,x2;
+         float gain;
+         do {
+            x1 = uni_rand(&st->seed);
+            x2 = uni_rand(&st->seed);
+         } while (x1*x1+x2*x2 > 1.);
+         gain = coef*sqrt(.1+st->curve[i]);
+         frame[2*i-1] = gain*x1;
+         frame[2*i] = gain*x2;
+      }
+      frame[0] = coef*uni_rand(&st->seed)*sqrt(.1+st->curve[0]);
+      frame[2*st->frame_size-1] = coef*uni_rand(&st->seed)*sqrt(.1+st->curve[st->frame_size-1]);
+      spx_drft_backward(&st->lookup,frame);
+      for (i=0;i<2*st->frame_size;i++)
+         frame[i] *= st->vorbis_win[i];
+#endif
+   
+      for (i=0;i<st->frame_size;i++)
+      {
+#ifdef VORBIS_PSYCHO
+         float tmp = st->y[i] + frame[i] + st->wola_mem[i];
+         st->wola_mem[i] = frame[i+st->frame_size];
+#else
+         float tmp = st->y[i];
+#endif
+         if (tmp>32767)
+            tmp = 32767;
+         if (tmp < -32767)
+            tmp = -32767;
+         out[i*st->channels+ch] = tmp;
+      }
+      
+      st->ringID[ch] = ringID;
+      st->order[ch] = order;
+      st->alpha[ch] = alpha;
+
+   }
+}
+
+EXPORT void speex_decorrelate_destroy(SpeexDecorrState *st)
+{
+#ifdef VORBIS_PSYCHO
+   vorbis_psy_destroy(st->psy);
+   speex_free(st->wola_mem);
+   speex_free(st->curve);
+#endif
+   speex_free(st->buff);
+   speex_free(st->ring);
+   speex_free(st->ringID);
+   speex_free(st->alpha);
+   speex_free(st->vorbis_win);
+   speex_free(st->order);
+   speex_free(st->y);
+   speex_free(st);
+}