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-rw-r--r--src/opus-1.0.2/celt/pitch.c410
1 files changed, 0 insertions, 410 deletions
diff --git a/src/opus-1.0.2/celt/pitch.c b/src/opus-1.0.2/celt/pitch.c
deleted file mode 100644
index ca0f523e..00000000
--- a/src/opus-1.0.2/celt/pitch.c
+++ /dev/null
@@ -1,410 +0,0 @@
-/* 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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