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-rw-r--r--src/opus-1.0.2/celt/pitch.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/src/opus-1.0.2/celt/pitch.c b/src/opus-1.0.2/celt/pitch.c
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+++ b/src/opus-1.0.2/celt/pitch.c
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+/* Copyright (c) 2007-2008 CSIRO
+ Copyright (c) 2007-2009 Xiph.Org Foundation
+ Written by Jean-Marc Valin */
+/**
+ @file pitch.c
+ @brief Pitch analysis
+ */
+
+/*
+ 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 "pitch.h"
+#include "os_support.h"
+#include "modes.h"
+#include "stack_alloc.h"
+#include "mathops.h"
+#include "celt_lpc.h"
+
+static void find_best_pitch(opus_val32 *xcorr, opus_val16 *y, int len,
+ int max_pitch, int *best_pitch
+#ifdef FIXED_POINT
+ , int yshift, opus_val32 maxcorr
+#endif
+ )
+{
+ int i, j;
+ opus_val32 Syy=1;
+ opus_val16 best_num[2];
+ opus_val32 best_den[2];
+#ifdef FIXED_POINT
+ int xshift;
+
+ xshift = celt_ilog2(maxcorr)-14;
+#endif
+
+ best_num[0] = -1;
+ best_num[1] = -1;
+ best_den[0] = 0;
+ best_den[1] = 0;
+ best_pitch[0] = 0;
+ best_pitch[1] = 1;
+ for (j=0;j<len;j++)
+ Syy = ADD32(Syy, SHR32(MULT16_16(y[j],y[j]), yshift));
+ for (i=0;i<max_pitch;i++)
+ {
+ if (xcorr[i]>0)
+ {
+ opus_val16 num;
+ opus_val32 xcorr16;
+ xcorr16 = EXTRACT16(VSHR32(xcorr[i], xshift));
+#ifndef FIXED_POINT
+ /* Considering the range of xcorr16, this should avoid both underflows
+ and overflows (inf) when squaring xcorr16 */
+ xcorr16 *= 1e-12f;
+#endif
+ num = MULT16_16_Q15(xcorr16,xcorr16);
+ if (MULT16_32_Q15(num,best_den[1]) > MULT16_32_Q15(best_num[1],Syy))
+ {
+ if (MULT16_32_Q15(num,best_den[0]) > MULT16_32_Q15(best_num[0],Syy))
+ {
+ best_num[1] = best_num[0];
+ best_den[1] = best_den[0];
+ best_pitch[1] = best_pitch[0];
+ best_num[0] = num;
+ best_den[0] = Syy;
+ best_pitch[0] = i;
+ } else {
+ best_num[1] = num;
+ best_den[1] = Syy;
+ best_pitch[1] = i;
+ }
+ }
+ }
+ Syy += SHR32(MULT16_16(y[i+len],y[i+len]),yshift) - SHR32(MULT16_16(y[i],y[i]),yshift);
+ Syy = MAX32(1, Syy);
+ }
+}
+
+void pitch_downsample(celt_sig * OPUS_RESTRICT x[], opus_val16 * OPUS_RESTRICT x_lp,
+ int len, int C)
+{
+ int i;
+ opus_val32 ac[5];
+ opus_val16 tmp=Q15ONE;
+ opus_val16 lpc[4], mem[4]={0,0,0,0};
+#ifdef FIXED_POINT
+ int shift;
+ opus_val32 maxabs = celt_maxabs32(x[0], len);
+ if (C==2)
+ {
+ opus_val32 maxabs_1 = celt_maxabs32(x[1], len);
+ maxabs = MAX32(maxabs, maxabs_1);
+ }
+ if (maxabs<1)
+ maxabs=1;
+ shift = celt_ilog2(maxabs)-10;
+ if (shift<0)
+ shift=0;
+ if (C==2)
+ shift++;
+#endif
+ for (i=1;i<len>>1;i++)
+ x_lp[i] = SHR32(HALF32(HALF32(x[0][(2*i-1)]+x[0][(2*i+1)])+x[0][2*i]), shift);
+ x_lp[0] = SHR32(HALF32(HALF32(x[0][1])+x[0][0]), shift);
+ if (C==2)
+ {
+ for (i=1;i<len>>1;i++)
+ x_lp[i] += SHR32(HALF32(HALF32(x[1][(2*i-1)]+x[1][(2*i+1)])+x[1][2*i]), shift);
+ x_lp[0] += SHR32(HALF32(HALF32(x[1][1])+x[1][0]), shift);
+ }
+
+ _celt_autocorr(x_lp, ac, NULL, 0,
+ 4, len>>1);
+
+ /* Noise floor -40 dB */
+#ifdef FIXED_POINT
+ ac[0] += SHR32(ac[0],13);
+#else
+ ac[0] *= 1.0001f;
+#endif
+ /* Lag windowing */
+ for (i=1;i<=4;i++)
+ {
+ /*ac[i] *= exp(-.5*(2*M_PI*.002*i)*(2*M_PI*.002*i));*/
+#ifdef FIXED_POINT
+ ac[i] -= MULT16_32_Q15(2*i*i, ac[i]);
+#else
+ ac[i] -= ac[i]*(.008f*i)*(.008f*i);
+#endif
+ }
+
+ _celt_lpc(lpc, ac, 4);
+ for (i=0;i<4;i++)
+ {
+ tmp = MULT16_16_Q15(QCONST16(.9f,15), tmp);
+ lpc[i] = MULT16_16_Q15(lpc[i], tmp);
+ }
+ celt_fir(x_lp, lpc, x_lp, len>>1, 4, mem);
+
+ mem[0]=0;
+ lpc[0]=QCONST16(.8f,12);
+ celt_fir(x_lp, lpc, x_lp, len>>1, 1, mem);
+
+}
+
+void pitch_search(const opus_val16 * OPUS_RESTRICT x_lp, opus_val16 * OPUS_RESTRICT y,
+ int len, int max_pitch, int *pitch)
+{
+ int i, j;
+ int lag;
+ int best_pitch[2]={0,0};
+ VARDECL(opus_val16, x_lp4);
+ VARDECL(opus_val16, y_lp4);
+ VARDECL(opus_val32, xcorr);
+#ifdef FIXED_POINT
+ opus_val32 maxcorr=1;
+ opus_val16 xmax, ymax;
+ int shift=0;
+#endif
+ int offset;
+
+ SAVE_STACK;
+
+ celt_assert(len>0);
+ celt_assert(max_pitch>0);
+ lag = len+max_pitch;
+
+ ALLOC(x_lp4, len>>2, opus_val16);
+ ALLOC(y_lp4, lag>>2, opus_val16);
+ ALLOC(xcorr, max_pitch>>1, opus_val32);
+
+ /* Downsample by 2 again */
+ for (j=0;j<len>>2;j++)
+ x_lp4[j] = x_lp[2*j];
+ for (j=0;j<lag>>2;j++)
+ y_lp4[j] = y[2*j];
+
+#ifdef FIXED_POINT
+ xmax = celt_maxabs16(x_lp4, len>>2);
+ ymax = celt_maxabs16(y_lp4, lag>>2);
+ shift = celt_ilog2(MAX16(1, MAX16(xmax, ymax)))-11;
+ if (shift>0)
+ {
+ for (j=0;j<len>>2;j++)
+ x_lp4[j] = SHR16(x_lp4[j], shift);
+ for (j=0;j<lag>>2;j++)
+ y_lp4[j] = SHR16(y_lp4[j], shift);
+ /* Use double the shift for a MAC */
+ shift *= 2;
+ } else {
+ shift = 0;
+ }
+#endif
+
+ /* Coarse search with 4x decimation */
+
+ for (i=0;i<max_pitch>>2;i++)
+ {
+ opus_val32 sum = 0;
+ for (j=0;j<len>>2;j++)
+ sum = MAC16_16(sum, x_lp4[j],y_lp4[i+j]);
+ xcorr[i] = MAX32(-1, sum);
+#ifdef FIXED_POINT
+ maxcorr = MAX32(maxcorr, sum);
+#endif
+ }
+ find_best_pitch(xcorr, y_lp4, len>>2, max_pitch>>2, best_pitch
+#ifdef FIXED_POINT
+ , 0, maxcorr
+#endif
+ );
+
+ /* Finer search with 2x decimation */
+#ifdef FIXED_POINT
+ maxcorr=1;
+#endif
+ for (i=0;i<max_pitch>>1;i++)
+ {
+ opus_val32 sum=0;
+ xcorr[i] = 0;
+ if (abs(i-2*best_pitch[0])>2 && abs(i-2*best_pitch[1])>2)
+ continue;
+ for (j=0;j<len>>1;j++)
+ sum += SHR32(MULT16_16(x_lp[j],y[i+j]), shift);
+ xcorr[i] = MAX32(-1, sum);
+#ifdef FIXED_POINT
+ maxcorr = MAX32(maxcorr, sum);
+#endif
+ }
+ find_best_pitch(xcorr, y, len>>1, max_pitch>>1, best_pitch
+#ifdef FIXED_POINT
+ , shift+1, maxcorr
+#endif
+ );
+
+ /* Refine by pseudo-interpolation */
+ if (best_pitch[0]>0 && best_pitch[0]<(max_pitch>>1)-1)
+ {
+ opus_val32 a, b, c;
+ a = xcorr[best_pitch[0]-1];
+ b = xcorr[best_pitch[0]];
+ c = xcorr[best_pitch[0]+1];
+ if ((c-a) > MULT16_32_Q15(QCONST16(.7f,15),b-a))
+ offset = 1;
+ else if ((a-c) > MULT16_32_Q15(QCONST16(.7f,15),b-c))
+ offset = -1;
+ else
+ offset = 0;
+ } else {
+ offset = 0;
+ }
+ *pitch = 2*best_pitch[0]-offset;
+
+ RESTORE_STACK;
+}
+
+static const int second_check[16] = {0, 0, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2};
+opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
+ int N, int *T0_, int prev_period, opus_val16 prev_gain)
+{
+ int k, i, T, T0;
+ opus_val16 g, g0;
+ opus_val16 pg;
+ opus_val32 xy,xx,yy;
+ opus_val32 xcorr[3];
+ opus_val32 best_xy, best_yy;
+ int offset;
+ int minperiod0;
+
+ minperiod0 = minperiod;
+ maxperiod /= 2;
+ minperiod /= 2;
+ *T0_ /= 2;
+ prev_period /= 2;
+ N /= 2;
+ x += maxperiod;
+ if (*T0_>=maxperiod)
+ *T0_=maxperiod-1;
+
+ T = T0 = *T0_;
+ xx=xy=yy=0;
+ for (i=0;i<N;i++)
+ {
+ xy = MAC16_16(xy, x[i], x[i-T0]);
+ xx = MAC16_16(xx, x[i], x[i]);
+ yy = MAC16_16(yy, x[i-T0],x[i-T0]);
+ }
+ best_xy = xy;
+ best_yy = yy;
+#ifdef FIXED_POINT
+ {
+ opus_val32 x2y2;
+ int sh, t;
+ x2y2 = 1+HALF32(MULT32_32_Q31(xx,yy));
+ sh = celt_ilog2(x2y2)>>1;
+ t = VSHR32(x2y2, 2*(sh-7));
+ g = g0 = VSHR32(MULT16_32_Q15(celt_rsqrt_norm(t), xy),sh+1);
+ }
+#else
+ g = g0 = xy/celt_sqrt(1+xx*yy);
+#endif
+ /* Look for any pitch at T/k */
+ for (k=2;k<=15;k++)
+ {
+ int T1, T1b;
+ opus_val16 g1;
+ opus_val16 cont=0;
+ T1 = (2*T0+k)/(2*k);
+ if (T1 < minperiod)
+ break;
+ /* Look for another strong correlation at T1b */
+ if (k==2)
+ {
+ if (T1+T0>maxperiod)
+ T1b = T0;
+ else
+ T1b = T0+T1;
+ } else
+ {
+ T1b = (2*second_check[k]*T0+k)/(2*k);
+ }
+ xy=yy=0;
+ for (i=0;i<N;i++)
+ {
+ xy = MAC16_16(xy, x[i], x[i-T1]);
+ yy = MAC16_16(yy, x[i-T1], x[i-T1]);
+
+ xy = MAC16_16(xy, x[i], x[i-T1b]);
+ yy = MAC16_16(yy, x[i-T1b], x[i-T1b]);
+ }
+#ifdef FIXED_POINT
+ {
+ opus_val32 x2y2;
+ int sh, t;
+ x2y2 = 1+MULT32_32_Q31(xx,yy);
+ sh = celt_ilog2(x2y2)>>1;
+ t = VSHR32(x2y2, 2*(sh-7));
+ g1 = VSHR32(MULT16_32_Q15(celt_rsqrt_norm(t), xy),sh+1);
+ }
+#else
+ g1 = xy/celt_sqrt(1+2.f*xx*1.f*yy);
+#endif
+ if (abs(T1-prev_period)<=1)
+ cont = prev_gain;
+ else if (abs(T1-prev_period)<=2 && 5*k*k < T0)
+ cont = HALF32(prev_gain);
+ else
+ cont = 0;
+ if (g1 > QCONST16(.3f,15) + MULT16_16_Q15(QCONST16(.4f,15),g0)-cont)
+ {
+ best_xy = xy;
+ best_yy = yy;
+ T = T1;
+ g = g1;
+ }
+ }
+ best_xy = MAX32(0, best_xy);
+ if (best_yy <= best_xy)
+ pg = Q15ONE;
+ else
+ pg = SHR32(frac_div32(best_xy,best_yy+1),16);
+
+ for (k=0;k<3;k++)
+ {
+ int T1 = T+k-1;
+ xy = 0;
+ for (i=0;i<N;i++)
+ xy = MAC16_16(xy, x[i], x[i-T1]);
+ xcorr[k] = xy;
+ }
+ if ((xcorr[2]-xcorr[0]) > MULT16_32_Q15(QCONST16(.7f,15),xcorr[1]-xcorr[0]))
+ offset = 1;
+ else if ((xcorr[0]-xcorr[2]) > MULT16_32_Q15(QCONST16(.7f,15),xcorr[1]-xcorr[2]))
+ offset = -1;
+ else
+ offset = 0;
+ if (pg > g)
+ pg = g;
+ *T0_ = 2*T+offset;
+
+ if (*T0_<minperiod0)
+ *T0_=minperiod0;
+ return pg;
+}
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