Add copy of opus library in deps/third_party.

opus/celt/vq.c

+/* Copyright (c) 2007-2008 CSIRO
+   Copyright (c) 2007-2009 Xiph.Org Foundation
+   Written by Jean-Marc Valin */
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+   - 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.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``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 COPYRIGHT OWNER
+   OR CONTRIBUTORS 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.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mathops.h"
+#include "cwrs.h"
+#include "vq.h"
+#include "arch.h"
+#include "os_support.h"
+#include "bands.h"
+#include "rate.h"
+
+static void exp_rotation1(celt_norm *X, int len, int stride, opus_val16 c, opus_val16 s)
+{
+   int i;
+   celt_norm *Xptr;
+   Xptr = X;
+   for (i=0;i<len-stride;i++)
+   {
+      celt_norm x1, x2;
+      x1 = Xptr[0];
+      x2 = Xptr[stride];
+      Xptr[stride] = EXTRACT16(SHR32(MULT16_16(c,x2) + MULT16_16(s,x1), 15));
+      *Xptr++      = EXTRACT16(SHR32(MULT16_16(c,x1) - MULT16_16(s,x2), 15));
+   }
+   Xptr = &X[len-2*stride-1];
+   for (i=len-2*stride-1;i>=0;i--)
+   {
+      celt_norm x1, x2;
+      x1 = Xptr[0];
+      x2 = Xptr[stride];
+      Xptr[stride] = EXTRACT16(SHR32(MULT16_16(c,x2) + MULT16_16(s,x1), 15));
+      *Xptr--      = EXTRACT16(SHR32(MULT16_16(c,x1) - MULT16_16(s,x2), 15));
+   }
+}
+
+static void exp_rotation(celt_norm *X, int len, int dir, int stride, int K, int spread)
+{
+   static const int SPREAD_FACTOR[3]={15,10,5};
+   int i;
+   opus_val16 c, s;
+   opus_val16 gain, theta;
+   int stride2=0;
+   int factor;
+
+   if (2*K>=len || spread==SPREAD_NONE)
+      return;
+   factor = SPREAD_FACTOR[spread-1];
+
+   gain = celt_div((opus_val32)MULT16_16(Q15_ONE,len),(opus_val32)(len+factor*K));
+   theta = HALF16(MULT16_16_Q15(gain,gain));
+
+   c = celt_cos_norm(EXTEND32(theta));
+   s = celt_cos_norm(EXTEND32(SUB16(Q15ONE,theta))); /*  sin(theta) */
+
+   if (len>=8*stride)
+   {
+      stride2 = 1;
+      /* This is just a simple (equivalent) way of computing sqrt(len/stride) with rounding.
+         It's basically incrementing long as (stride2+0.5)^2 < len/stride. */
+      while ((stride2*stride2+stride2)*stride + (stride>>2) < len)
+         stride2++;
+   }
+   /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
+      extract_collapse_mask().*/
+   len /= stride;
+   for (i=0;i<stride;i++)
+   {
+      if (dir < 0)
+      {
+         if (stride2)
+            exp_rotation1(X+i*len, len, stride2, s, c);
+         exp_rotation1(X+i*len, len, 1, c, s);
+      } else {
+         exp_rotation1(X+i*len, len, 1, c, -s);
+         if (stride2)
+            exp_rotation1(X+i*len, len, stride2, s, -c);
+      }
+   }
+}
+
+/** Takes the pitch vector and the decoded residual vector, computes the gain
+    that will give ||p+g*y||=1 and mixes the residual with the pitch. */
+static void normalise_residual(int * OPUS_RESTRICT iy, celt_norm * OPUS_RESTRICT X,
+      int N, opus_val32 Ryy, opus_val16 gain)
+{
+   int i;
+#ifdef FIXED_POINT
+   int k;
+#endif
+   opus_val32 t;
+   opus_val16 g;
+
+#ifdef FIXED_POINT
+   k = celt_ilog2(Ryy)>>1;
+#endif
+   t = VSHR32(Ryy, 2*(k-7));
+   g = MULT16_16_P15(celt_rsqrt_norm(t),gain);
+
+   i=0;
+   do
+      X[i] = EXTRACT16(PSHR32(MULT16_16(g, iy[i]), k+1));
+   while (++i < N);
+}
+
+static unsigned extract_collapse_mask(int *iy, int N, int B)
+{
+   unsigned collapse_mask;
+   int N0;
+   int i;
+   if (B<=1)
+      return 1;
+   /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
+      exp_rotation().*/
+   N0 = N/B;
+   collapse_mask = 0;
+   i=0; do {
+      int j;
+      j=0; do {
+         collapse_mask |= (iy[i*N0+j]!=0)<<i;
+      } while (++j<N0);
+   } while (++i<B);
+   return collapse_mask;
+}
+
+unsigned alg_quant(celt_norm *X, int N, int K, int spread, int B, ec_enc *enc
+#ifdef RESYNTH
+   , opus_val16 gain
+#endif
+   )
+{
+   VARDECL(celt_norm, y);
+   VARDECL(int, iy);
+   VARDECL(opus_val16, signx);
+   int i, j;
+   opus_val16 s;
+   int pulsesLeft;
+   opus_val32 sum;
+   opus_val32 xy;
+   opus_val16 yy;
+   unsigned collapse_mask;
+   SAVE_STACK;
+
+   celt_assert2(K>0, "alg_quant() needs at least one pulse");
+   celt_assert2(N>1, "alg_quant() needs at least two dimensions");
+
+   ALLOC(y, N, celt_norm);
+   ALLOC(iy, N, int);
+   ALLOC(signx, N, opus_val16);
+
+   exp_rotation(X, N, 1, B, K, spread);
+
+   /* Get rid of the sign */
+   sum = 0;
+   j=0; do {
+      if (X[j]>0)
+         signx[j]=1;
+      else {
+         signx[j]=-1;
+         X[j]=-X[j];
+      }
+      iy[j] = 0;
+      y[j] = 0;
+   } while (++j<N);
+
+   xy = yy = 0;
+
+   pulsesLeft = K;
+
+   /* Do a pre-search by projecting on the pyramid */
+   if (K > (N>>1))
+   {
+      opus_val16 rcp;
+      j=0; do {
+         sum += X[j];
+      }  while (++j<N);
+
+      /* If X is too small, just replace it with a pulse at 0 */
+#ifdef FIXED_POINT
+      if (sum <= K)
+#else
+      /* Prevents infinities and NaNs from causing too many pulses
+         to be allocated. 64 is an approximation of infinity here. */
+      if (!(sum > EPSILON && sum < 64))
+#endif
+      {
+         X[0] = QCONST16(1.f,14);
+         j=1; do
+            X[j]=0;
+         while (++j<N);
+         sum = QCONST16(1.f,14);
+      }
+      rcp = EXTRACT16(MULT16_32_Q16(K-1, celt_rcp(sum)));
+      j=0; do {
+#ifdef FIXED_POINT
+         /* It's really important to round *towards zero* here */
+         iy[j] = MULT16_16_Q15(X[j],rcp);
+#else
+         iy[j] = (int)floor(rcp*X[j]);
+#endif
+         y[j] = (celt_norm)iy[j];
+         yy = MAC16_16(yy, y[j],y[j]);
+         xy = MAC16_16(xy, X[j],y[j]);
+         y[j] *= 2;
+         pulsesLeft -= iy[j];
+      }  while (++j<N);
+   }
+   celt_assert2(pulsesLeft>=1, "Allocated too many pulses in the quick pass");
+
+   /* This should never happen, but just in case it does (e.g. on silence)
+      we fill the first bin with pulses. */
+#ifdef FIXED_POINT_DEBUG
+   celt_assert2(pulsesLeft<=N+3, "Not enough pulses in the quick pass");
+#endif
+   if (pulsesLeft > N+3)
+   {
+      opus_val16 tmp = (opus_val16)pulsesLeft;
+      yy = MAC16_16(yy, tmp, tmp);
+      yy = MAC16_16(yy, tmp, y[0]);
+      iy[0] += pulsesLeft;
+      pulsesLeft=0;
+   }
+
+   s = 1;
+   for (i=0;i<pulsesLeft;i++)
+   {
+      int best_id;
+      opus_val32 best_num = -VERY_LARGE16;
+      opus_val16 best_den = 0;
+#ifdef FIXED_POINT
+      int rshift;
+#endif
+#ifdef FIXED_POINT
+      rshift = 1+celt_ilog2(K-pulsesLeft+i+1);
+#endif
+      best_id = 0;
+      /* The squared magnitude term gets added anyway, so we might as well
+         add it outside the loop */
+      yy = ADD32(yy, 1);
+      j=0;
+      do {
+         opus_val16 Rxy, Ryy;
+         /* Temporary sums of the new pulse(s) */
+         Rxy = EXTRACT16(SHR32(ADD32(xy, EXTEND32(X[j])),rshift));
+         /* We're multiplying y[j] by two so we don't have to do it here */
+         Ryy = ADD16(yy, y[j]);
+
+         /* Approximate score: we maximise Rxy/sqrt(Ryy) (we're guaranteed that
+            Rxy is positive because the sign is pre-computed) */
+         Rxy = MULT16_16_Q15(Rxy,Rxy);
+         /* The idea is to check for num/den >= best_num/best_den, but that way
+            we can do it without any division */
+         /* OPT: Make sure to use conditional moves here */
+         if (MULT16_16(best_den, Rxy) > MULT16_16(Ryy, best_num))
+         {
+            best_den = Ryy;
+            best_num = Rxy;
+            best_id = j;
+         }
+      } while (++j<N);
+
+      /* Updating the sums of the new pulse(s) */
+      xy = ADD32(xy, EXTEND32(X[best_id]));
+      /* We're multiplying y[j] by two so we don't have to do it here */
+      yy = ADD16(yy, y[best_id]);
+
+      /* Only now that we've made the final choice, update y/iy */
+      /* Multiplying y[j] by 2 so we don't have to do it everywhere else */
+      y[best_id] += 2*s;
+      iy[best_id]++;
+   }
+
+   /* Put the original sign back */
+   j=0;
+   do {
+      X[j] = MULT16_16(signx[j],X[j]);
+      if (signx[j] < 0)
+         iy[j] = -iy[j];
+   } while (++j<N);
+   encode_pulses(iy, N, K, enc);
+
+#ifdef RESYNTH
+   normalise_residual(iy, X, N, yy, gain);
+   exp_rotation(X, N, -1, B, K, spread);
+#endif
+
+   collapse_mask = extract_collapse_mask(iy, N, B);
+   RESTORE_STACK;
+   return collapse_mask;
+}
+
+/** Decode pulse vector and combine the result with the pitch vector to produce
+    the final normalised signal in the current band. */
+unsigned alg_unquant(celt_norm *X, int N, int K, int spread, int B,
+      ec_dec *dec, opus_val16 gain)
+{
+   int i;
+   opus_val32 Ryy;
+   unsigned collapse_mask;
+   VARDECL(int, iy);
+   SAVE_STACK;
+
+   celt_assert2(K>0, "alg_unquant() needs at least one pulse");
+   celt_assert2(N>1, "alg_unquant() needs at least two dimensions");
+   ALLOC(iy, N, int);
+   decode_pulses(iy, N, K, dec);
+   Ryy = 0;
+   i=0;
+   do {
+      Ryy = MAC16_16(Ryy, iy[i], iy[i]);
+   } while (++i < N);
+   normalise_residual(iy, X, N, Ryy, gain);
+   exp_rotation(X, N, -1, B, K, spread);
+   collapse_mask = extract_collapse_mask(iy, N, B);
+   RESTORE_STACK;
+   return collapse_mask;
+}
+
+void renormalise_vector(celt_norm *X, int N, opus_val16 gain)
+{
+   int i;
+#ifdef FIXED_POINT
+   int k;
+#endif
+   opus_val32 E = EPSILON;
+   opus_val16 g;
+   opus_val32 t;
+   celt_norm *xptr = X;
+   for (i=0;i<N;i++)
+   {
+      E = MAC16_16(E, *xptr, *xptr);
+      xptr++;
+   }
+#ifdef FIXED_POINT
+   k = celt_ilog2(E)>>1;
+#endif
+   t = VSHR32(E, 2*(k-7));
+   g = MULT16_16_P15(celt_rsqrt_norm(t),gain);
+
+   xptr = X;
+   for (i=0;i<N;i++)
+   {
+      *xptr = EXTRACT16(PSHR32(MULT16_16(g, *xptr), k+1));
+      xptr++;
+   }
+   /*return celt_sqrt(E);*/
+}
+
+int stereo_itheta(celt_norm *X, celt_norm *Y, int stereo, int N)
+{
+   int i;
+   int itheta;
+   opus_val16 mid, side;
+   opus_val32 Emid, Eside;
+
+   Emid = Eside = EPSILON;
+   if (stereo)
+   {
+      for (i=0;i<N;i++)
+      {
+         celt_norm m, s;
+         m = ADD16(SHR16(X[i],1),SHR16(Y[i],1));
+         s = SUB16(SHR16(X[i],1),SHR16(Y[i],1));
+         Emid = MAC16_16(Emid, m, m);
+         Eside = MAC16_16(Eside, s, s);
+      }
+   } else {
+      for (i=0;i<N;i++)
+      {
+         celt_norm m, s;
+         m = X[i];
+         s = Y[i];
+         Emid = MAC16_16(Emid, m, m);
+         Eside = MAC16_16(Eside, s, s);
+      }
+   }
+   mid = celt_sqrt(Emid);
+   side = celt_sqrt(Eside);
+#ifdef FIXED_POINT
+   /* 0.63662 = 2/pi */
+   itheta = MULT16_16_Q15(QCONST16(0.63662f,15),celt_atan2p(side, mid));
+#else
+   itheta = (int)floor(.5f+16384*0.63662f*atan2(side,mid));
+#endif
+
+   return itheta;
+}