435 lines
11 KiB
C
435 lines
11 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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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
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "mathops.h"
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#include "cwrs.h"
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#include "vq.h"
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#include "arch.h"
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#include "os_support.h"
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#include "bands.h"
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#include "rate.h"
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#ifndef M_PI
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#define M_PI 3.141592653
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#endif
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static void exp_rotation1(celt_norm *X, int len, int stride, celt_word16 c, celt_word16 s)
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{
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int i;
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celt_norm *Xptr;
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Xptr = X;
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for (i=0;i<len-stride;i++)
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{
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celt_norm x1, x2;
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x1 = Xptr[0];
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x2 = Xptr[stride];
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Xptr[stride] = EXTRACT16(SHR32(MULT16_16(c,x2) + MULT16_16(s,x1), 15));
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*Xptr++ = EXTRACT16(SHR32(MULT16_16(c,x1) - MULT16_16(s,x2), 15));
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}
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Xptr = &X[len-2*stride-1];
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for (i=len-2*stride-1;i>=0;i--)
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{
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celt_norm x1, x2;
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x1 = Xptr[0];
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x2 = Xptr[stride];
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Xptr[stride] = EXTRACT16(SHR32(MULT16_16(c,x2) + MULT16_16(s,x1), 15));
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*Xptr-- = EXTRACT16(SHR32(MULT16_16(c,x1) - MULT16_16(s,x2), 15));
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}
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}
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static void exp_rotation(celt_norm *X, int len, int dir, int stride, int K, int spread)
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{
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static const int SPREAD_FACTOR[3]={5,10,15};
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int i;
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celt_word16 c, s;
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celt_word16 gain, theta;
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int stride2=0;
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int factor;
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/*int i;
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if (len>=30)
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{
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for (i=0;i<len;i++)
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X[i] = 0;
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X[14] = 1;
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K=5;
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}*/
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if (2*K>=len || spread==SPREAD_NONE)
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return;
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factor = SPREAD_FACTOR[spread-1];
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gain = celt_div((celt_word32)MULT16_16(Q15_ONE,len),(celt_word32)(len+factor*K));
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/* FIXME: Make that HALF16 instead of HALF32 */
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theta = HALF32(MULT16_16_Q15(gain,gain));
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c = celt_cos_norm(EXTEND32(theta));
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s = celt_cos_norm(EXTEND32(SUB16(Q15ONE,theta))); /* sin(theta) */
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if (len>=8*stride)
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{
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stride2 = 1;
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/* This is just a simple way of computing sqrt(len/stride) with rounding.
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It's basically incrementing long as (stride2+0.5)^2 < len/stride.
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I _think_ it is bit-exact */
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while ((stride2*stride2+stride2)*stride + (stride>>2) < len)
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stride2++;
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}
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/*TODO: We should be passing around log2(B), not B, for both this and for
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extract_collapse_mask().*/
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len /= stride;
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for (i=0;i<stride;i++)
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{
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if (dir < 0)
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{
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if (stride2)
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exp_rotation1(X+i*len, len, stride2, s, c);
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exp_rotation1(X+i*len, len, 1, c, s);
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} else {
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exp_rotation1(X+i*len, len, 1, c, -s);
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if (stride2)
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exp_rotation1(X+i*len, len, stride2, s, -c);
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}
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}
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/*if (len>=30)
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{
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for (i=0;i<len;i++)
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printf ("%f ", X[i]);
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printf ("\n");
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exit(0);
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}*/
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}
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/** Takes the pitch vector and the decoded residual vector, computes the gain
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that will give ||p+g*y||=1 and mixes the residual with the pitch. */
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static void normalise_residual(int * restrict iy, celt_norm * restrict X,
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int N, celt_word32 Ryy, celt_word16 gain)
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{
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int i;
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#ifdef FIXED_POINT
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int k;
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#endif
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celt_word32 t;
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celt_word16 g;
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#ifdef FIXED_POINT
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k = celt_ilog2(Ryy)>>1;
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#endif
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t = VSHR32(Ryy, (k-7)<<1);
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g = MULT16_16_P15(celt_rsqrt_norm(t),gain);
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i=0;
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do
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X[i] = EXTRACT16(PSHR32(MULT16_16(g, iy[i]), k+1));
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while (++i < N);
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}
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static unsigned extract_collapse_mask(int *iy, int N, int B)
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{
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unsigned collapse_mask;
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int N0;
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int i;
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if (B<=1)
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return 1;
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/*TODO: We should be passing around log2(B), not B, for both this and for
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exp_rotation().*/
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N0 = N/B;
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collapse_mask = 0;
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i=0; do {
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int j;
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j=0; do {
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collapse_mask |= (iy[i*N0+j]!=0)<<i;
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} while (++j<N0);
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} while (++i<B);
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return collapse_mask;
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}
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unsigned alg_quant(celt_norm *X, int N, int K, int spread, int B,
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int resynth, ec_enc *enc, celt_word16 gain)
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{
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VARDECL(celt_norm, y);
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VARDECL(int, iy);
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VARDECL(celt_word16, signx);
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int i, j;
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celt_word16 s;
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int pulsesLeft;
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celt_word32 sum;
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celt_word32 xy;
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celt_word16 yy;
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unsigned collapse_mask;
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SAVE_STACK;
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celt_assert2(K!=0, "alg_quant() needs at least one pulse");
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ALLOC(y, N, celt_norm);
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ALLOC(iy, N, int);
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ALLOC(signx, N, celt_word16);
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exp_rotation(X, N, 1, B, K, spread);
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/* Get rid of the sign */
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sum = 0;
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j=0; do {
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if (X[j]>0)
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signx[j]=1;
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else {
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signx[j]=-1;
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X[j]=-X[j];
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}
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iy[j] = 0;
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y[j] = 0;
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} while (++j<N);
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xy = yy = 0;
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pulsesLeft = K;
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/* Do a pre-search by projecting on the pyramid */
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if (K > (N>>1))
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{
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celt_word16 rcp;
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j=0; do {
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sum += X[j];
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} while (++j<N);
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/* If X is too small, just replace it with a pulse at 0 */
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#ifdef FIXED_POINT
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if (sum <= K)
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#else
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if (sum <= EPSILON)
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#endif
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{
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X[0] = QCONST16(1.f,14);
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j=1; do
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X[j]=0;
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while (++j<N);
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sum = QCONST16(1.f,14);
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}
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/* Do we have sufficient accuracy here? */
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rcp = EXTRACT16(MULT16_32_Q16(K-1, celt_rcp(sum)));
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j=0; do {
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#ifdef FIXED_POINT
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/* It's really important to round *towards zero* here */
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iy[j] = MULT16_16_Q15(X[j],rcp);
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#else
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iy[j] = (int)floor(rcp*X[j]);
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#endif
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y[j] = iy[j];
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yy = MAC16_16(yy, y[j],y[j]);
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xy = MAC16_16(xy, X[j],y[j]);
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y[j] *= 2;
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pulsesLeft -= iy[j];
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} while (++j<N);
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}
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celt_assert2(pulsesLeft>=1, "Allocated too many pulses in the quick pass");
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/* This should never happen, but just in case it does (e.g. on silence)
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we fill the first bin with pulses. */
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#ifdef FIXED_POINT_DEBUG
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celt_assert2(pulsesLeft<=N+3, "Not enough pulses in the quick pass");
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#endif
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if (pulsesLeft > N+3)
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{
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celt_word16 tmp = pulsesLeft;
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yy = MAC16_16(yy, tmp, tmp);
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yy = MAC16_16(yy, tmp, y[0]);
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iy[0] += pulsesLeft;
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pulsesLeft=0;
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}
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s = 1;
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for (i=0;i<pulsesLeft;i++)
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{
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int best_id;
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celt_word32 best_num = -VERY_LARGE16;
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celt_word16 best_den = 0;
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#ifdef FIXED_POINT
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int rshift;
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#endif
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#ifdef FIXED_POINT
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rshift = 1+celt_ilog2(K-pulsesLeft+i+1);
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#endif
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best_id = 0;
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/* The squared magnitude term gets added anyway, so we might as well
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add it outside the loop */
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yy = ADD32(yy, 1);
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j=0;
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do {
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celt_word16 Rxy, Ryy;
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/* Temporary sums of the new pulse(s) */
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Rxy = EXTRACT16(SHR32(ADD32(xy, EXTEND32(X[j])),rshift));
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/* We're multiplying y[j] by two so we don't have to do it here */
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Ryy = ADD16(yy, y[j]);
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/* Approximate score: we maximise Rxy/sqrt(Ryy) (we're guaranteed that
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Rxy is positive because the sign is pre-computed) */
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Rxy = MULT16_16_Q15(Rxy,Rxy);
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/* The idea is to check for num/den >= best_num/best_den, but that way
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we can do it without any division */
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/* OPT: Make sure to use conditional moves here */
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if (MULT16_16(best_den, Rxy) > MULT16_16(Ryy, best_num))
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{
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best_den = Ryy;
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best_num = Rxy;
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best_id = j;
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}
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} while (++j<N);
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/* Updating the sums of the new pulse(s) */
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xy = ADD32(xy, EXTEND32(X[best_id]));
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/* We're multiplying y[j] by two so we don't have to do it here */
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yy = ADD16(yy, y[best_id]);
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/* Only now that we've made the final choice, update y/iy */
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/* Multiplying y[j] by 2 so we don't have to do it everywhere else */
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y[best_id] += 2*s;
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iy[best_id]++;
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}
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/* Put the original sign back */
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j=0;
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do {
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X[j] = MULT16_16(signx[j],X[j]);
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if (signx[j] < 0)
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iy[j] = -iy[j];
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} while (++j<N);
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encode_pulses(iy, N, K, enc);
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if (resynth)
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{
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normalise_residual(iy, X, N, yy, gain);
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exp_rotation(X, N, -1, B, K, spread);
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}
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collapse_mask = extract_collapse_mask(iy, N, B);
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RESTORE_STACK;
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return collapse_mask;
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}
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/** Decode pulse vector and combine the result with the pitch vector to produce
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the final normalised signal in the current band. */
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unsigned alg_unquant(celt_norm *X, int N, int K, int spread, int B,
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ec_dec *dec, celt_word16 gain)
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{
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int i;
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celt_word32 Ryy;
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unsigned collapse_mask;
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VARDECL(int, iy);
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SAVE_STACK;
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celt_assert2(K!=0, "alg_unquant() needs at least one pulse");
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ALLOC(iy, N, int);
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decode_pulses(iy, N, K, dec);
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Ryy = 0;
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i=0;
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do {
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Ryy = MAC16_16(Ryy, iy[i], iy[i]);
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} while (++i < N);
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normalise_residual(iy, X, N, Ryy, gain);
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exp_rotation(X, N, -1, B, K, spread);
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collapse_mask = extract_collapse_mask(iy, N, B);
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RESTORE_STACK;
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return collapse_mask;
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}
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void renormalise_vector(celt_norm *X, int N, celt_word16 gain)
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{
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int i;
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#ifdef FIXED_POINT
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int k;
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#endif
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celt_word32 E = EPSILON;
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celt_word16 g;
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celt_word32 t;
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celt_norm *xptr = X;
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for (i=0;i<N;i++)
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{
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E = MAC16_16(E, *xptr, *xptr);
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xptr++;
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}
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#ifdef FIXED_POINT
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k = celt_ilog2(E)>>1;
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#endif
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t = VSHR32(E, (k-7)<<1);
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g = MULT16_16_P15(celt_rsqrt_norm(t),gain);
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xptr = X;
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for (i=0;i<N;i++)
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{
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*xptr = EXTRACT16(PSHR32(MULT16_16(g, *xptr), k+1));
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xptr++;
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}
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/*return celt_sqrt(E);*/
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}
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int stereo_itheta(celt_norm *X, celt_norm *Y, int stereo, int N)
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{
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int i;
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int itheta;
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celt_word16 mid, side;
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celt_word32 Emid, Eside;
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Emid = Eside = EPSILON;
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if (stereo)
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{
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for (i=0;i<N;i++)
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{
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celt_norm m, s;
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m = ADD16(SHR16(X[i],1),SHR16(Y[i],1));
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s = SUB16(SHR16(X[i],1),SHR16(Y[i],1));
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Emid = MAC16_16(Emid, m, m);
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Eside = MAC16_16(Eside, s, s);
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}
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} else {
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for (i=0;i<N;i++)
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{
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celt_norm m, s;
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m = X[i];
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s = Y[i];
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Emid = MAC16_16(Emid, m, m);
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Eside = MAC16_16(Eside, s, s);
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}
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}
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mid = celt_sqrt(Emid);
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side = celt_sqrt(Eside);
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#ifdef FIXED_POINT
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/* 0.63662 = 2/pi */
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itheta = MULT16_16_Q15(QCONST16(0.63662f,15),celt_atan2p(side, mid));
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#else
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itheta = (int)floor(.5f+16384*0.63662f*atan2(side,mid));
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#endif
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return itheta;
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}
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