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.
408 lines
11 KiB
C
408 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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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 COPYRIGHT OWNER
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OR 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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#include "pitch.h"
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#ifndef OVERRIDE_vq_exp_rotation1
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static void exp_rotation1(celt_norm *X, int len, int stride, opus_val16 c, opus_val16 s)
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{
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int i;
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opus_val16 ms;
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celt_norm *Xptr;
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Xptr = X;
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ms = NEG16(s);
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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(PSHR32(MAC16_16(MULT16_16(c, x2), s, x1), 15));
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*Xptr++ = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x1), ms, 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(PSHR32(MAC16_16(MULT16_16(c, x2), s, x1), 15));
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*Xptr-- = EXTRACT16(PSHR32(MAC16_16(MULT16_16(c, x1), ms, x2), 15));
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}
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}
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#endif /* OVERRIDE_vq_exp_rotation1 */
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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]={15,10,5};
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int i;
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opus_val16 c, s;
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opus_val16 gain, theta;
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int stride2=0;
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int factor;
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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((opus_val32)MULT16_16(Q15_ONE,len),(opus_val32)(len+factor*K));
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theta = HALF16(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 (equivalent) 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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while ((stride2*stride2+stride2)*stride + (stride>>2) < len)
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stride2++;
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}
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/*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
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extract_collapse_mask().*/
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len = celt_udiv(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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}
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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 * OPUS_RESTRICT iy, celt_norm * OPUS_RESTRICT X,
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int N, opus_val32 Ryy, opus_val16 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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opus_val32 t;
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opus_val16 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, 2*(k-7));
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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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/*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for
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exp_rotation().*/
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N0 = celt_udiv(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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unsigned tmp=0;
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j=0; do {
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tmp |= iy[i*N0+j];
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} while (++j<N0);
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collapse_mask |= (tmp!=0)<<i;
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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, ec_enc *enc
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#ifdef RESYNTH
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, opus_val16 gain
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#endif
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)
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{
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VARDECL(celt_norm, y);
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VARDECL(int, iy);
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VARDECL(opus_val16, signx);
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int i, j;
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opus_val16 s;
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int pulsesLeft;
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opus_val32 sum;
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opus_val32 xy;
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opus_val16 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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celt_assert2(N>1, "alg_quant() needs at least two dimensions");
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ALLOC(y, N, celt_norm);
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ALLOC(iy, N, int);
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ALLOC(signx, N, opus_val16);
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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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opus_val16 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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/* Prevents infinities and NaNs from causing too many pulses
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to be allocated. 64 is an approximation of infinity here. */
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if (!(sum > EPSILON && sum < 64))
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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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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] = (celt_norm)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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opus_val16 tmp = (opus_val16)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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opus_val32 best_num = -VERY_LARGE16;
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opus_val16 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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opus_val16 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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#ifdef RESYNTH
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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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#endif
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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, opus_val16 gain)
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{
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opus_val32 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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celt_assert2(N>1, "alg_unquant() needs at least two dimensions");
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ALLOC(iy, N, int);
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Ryy = decode_pulses(iy, N, K, dec);
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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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#ifndef OVERRIDE_renormalise_vector
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void renormalise_vector(celt_norm *X, int N, opus_val16 gain, int arch)
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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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opus_val32 E;
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opus_val16 g;
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opus_val32 t;
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celt_norm *xptr;
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E = EPSILON + celt_inner_prod(X, X, N, arch);
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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, 2*(k-7));
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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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#endif /* OVERRIDE_renormalise_vector */
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int stereo_itheta(const celt_norm *X, const celt_norm *Y, int stereo, int N, int arch)
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{
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int i;
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int itheta;
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opus_val16 mid, side;
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opus_val32 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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Emid += celt_inner_prod(X, X, N, arch);
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Eside += celt_inner_prod(Y, Y, N, arch);
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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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