538 lines
14 KiB
C
538 lines
14 KiB
C
|
/* 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 OPUS_HAVE_CONFIG_H
|
||
|
|
#include "opus_config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "pitch.h"
|
||
|
|
#include "os_support.h"
|
||
|
|
#include "opus_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 OPUS_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 OPUS_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 OPUS_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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void celt_fir5(const opus_val16 *x,
|
||
|
|
const opus_val16 *num,
|
||
|
|
opus_val16 *y,
|
||
|
|
int N,
|
||
|
|
opus_val16 *mem)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
opus_val16 num0, num1, num2, num3, num4;
|
||
|
|
opus_val32 mem0, mem1, mem2, mem3, mem4;
|
||
|
|
num0=num[0];
|
||
|
|
num1=num[1];
|
||
|
|
num2=num[2];
|
||
|
|
num3=num[3];
|
||
|
|
num4=num[4];
|
||
|
|
mem0=mem[0];
|
||
|
|
mem1=mem[1];
|
||
|
|
mem2=mem[2];
|
||
|
|
mem3=mem[3];
|
||
|
|
mem4=mem[4];
|
||
|
|
for (i=0;i<N;i++)
|
||
|
|
{
|
||
|
|
opus_val32 sum = SHL32(EXTEND32(x[i]), SIG_SHIFT);
|
||
|
|
sum = MAC16_16(sum,num0,mem0);
|
||
|
|
sum = MAC16_16(sum,num1,mem1);
|
||
|
|
sum = MAC16_16(sum,num2,mem2);
|
||
|
|
sum = MAC16_16(sum,num3,mem3);
|
||
|
|
sum = MAC16_16(sum,num4,mem4);
|
||
|
|
mem4 = mem3;
|
||
|
|
mem3 = mem2;
|
||
|
|
mem2 = mem1;
|
||
|
|
mem1 = mem0;
|
||
|
|
mem0 = x[i];
|
||
|
|
y[i] = ROUND16(sum, SIG_SHIFT);
|
||
|
|
}
|
||
|
|
mem[0]=mem0;
|
||
|
|
mem[1]=mem1;
|
||
|
|
mem[2]=mem2;
|
||
|
|
mem[3]=mem3;
|
||
|
|
mem[4]=mem4;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void pitch_downsample(celt_sig * OPUS_RESTRICT x[], opus_val16 * OPUS_RESTRICT x_lp,
|
||
|
|
int len, int C, int arch)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
opus_val32 ac[5];
|
||
|
|
opus_val16 tmp=Q15ONE;
|
||
|
|
opus_val16 lpc[4], mem[5]={0,0,0,0,0};
|
||
|
|
opus_val16 lpc2[5];
|
||
|
|
opus_val16 c1 = QCONST16(.8f,15);
|
||
|
|
#ifdef OPUS_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, arch);
|
||
|
|
|
||
|
|
/* Noise floor -40 dB */
|
||
|
|
#ifdef OPUS_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 OPUS_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);
|
||
|
|
}
|
||
|
|
/* Add a zero */
|
||
|
|
lpc2[0] = lpc[0] + QCONST16(.8f,SIG_SHIFT);
|
||
|
|
lpc2[1] = lpc[1] + MULT16_16_Q15(c1,lpc[0]);
|
||
|
|
lpc2[2] = lpc[2] + MULT16_16_Q15(c1,lpc[1]);
|
||
|
|
lpc2[3] = lpc[3] + MULT16_16_Q15(c1,lpc[2]);
|
||
|
|
lpc2[4] = MULT16_16_Q15(c1,lpc[3]);
|
||
|
|
celt_fir5(x_lp, lpc2, x_lp, len>>1, mem);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if 0 /* This is a simple version of the pitch correlation that should work
|
||
|
|
well on DSPs like Blackfin and TI C5x/C6x */
|
||
|
|
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
opus_val32
|
||
|
|
#else
|
||
|
|
void
|
||
|
|
#endif
|
||
|
|
celt_pitch_xcorr(opus_val16 *x, opus_val16 *y, opus_val32 *xcorr, int len, int max_pitch)
|
||
|
|
{
|
||
|
|
int i, j;
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
opus_val32 maxcorr=1;
|
||
|
|
#endif
|
||
|
|
for (i=0;i<max_pitch;i++)
|
||
|
|
{
|
||
|
|
opus_val32 sum = 0;
|
||
|
|
for (j=0;j<len;j++)
|
||
|
|
sum = MAC16_16(sum, x[j],y[i+j]);
|
||
|
|
xcorr[i] = sum;
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
maxcorr = MAX32(maxcorr, sum);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
return maxcorr;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#else /* Unrolled version of the pitch correlation -- runs faster on x86 and ARM */
|
||
|
|
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
opus_val32
|
||
|
|
#else
|
||
|
|
void
|
||
|
|
#endif
|
||
|
|
celt_pitch_xcorr_c(const opus_val16 *_x, const opus_val16 *_y, opus_val32 *xcorr, int len, int max_pitch)
|
||
|
|
{
|
||
|
|
int i,j;
|
||
|
|
/*The EDSP version requires that max_pitch is at least 1, and that _x is
|
||
|
|
32-bit aligned.
|
||
|
|
Since it's hard to put asserts in assembly, put them here.*/
|
||
|
|
celt_assert(max_pitch>0);
|
||
|
|
celt_assert((((unsigned char *)_x-(unsigned char *)NULL)&3)==0);
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
opus_val32 maxcorr=1;
|
||
|
|
#endif
|
||
|
|
for (i=0;i<max_pitch-3;i+=4)
|
||
|
|
{
|
||
|
|
opus_val32 sum[4]={0,0,0,0};
|
||
|
|
xcorr_kernel(_x, _y+i, sum, len);
|
||
|
|
xcorr[i]=sum[0];
|
||
|
|
xcorr[i+1]=sum[1];
|
||
|
|
xcorr[i+2]=sum[2];
|
||
|
|
xcorr[i+3]=sum[3];
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
sum[0] = MAX32(sum[0], sum[1]);
|
||
|
|
sum[2] = MAX32(sum[2], sum[3]);
|
||
|
|
sum[0] = MAX32(sum[0], sum[2]);
|
||
|
|
maxcorr = MAX32(maxcorr, sum[0]);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
/* In case max_pitch isn't a multiple of 4, do non-unrolled version. */
|
||
|
|
for (;i<max_pitch;i++)
|
||
|
|
{
|
||
|
|
opus_val32 sum = 0;
|
||
|
|
for (j=0;j<len;j++)
|
||
|
|
sum = MAC16_16(sum, _x[j],_y[i+j]);
|
||
|
|
xcorr[i] = sum;
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
maxcorr = MAX32(maxcorr, sum);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
return maxcorr;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
void pitch_search(const opus_val16 * OPUS_RESTRICT x_lp, opus_val16 * OPUS_RESTRICT y,
|
||
|
|
int len, int max_pitch, int *pitch, int arch)
|
||
|
|
{
|
||
|
|
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 OPUS_FIXED_POINT
|
||
|
|
opus_val32 maxcorr;
|
||
|
|
opus_val32 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 OPUS_FIXED_POINT
|
||
|
|
xmax = celt_maxabs16(x_lp4, len>>2);
|
||
|
|
ymax = celt_maxabs16(y_lp4, lag>>2);
|
||
|
|
shift = celt_ilog2(MAX32(1, MAX32(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 */
|
||
|
|
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
maxcorr =
|
||
|
|
#endif
|
||
|
|
celt_pitch_xcorr(x_lp4, y_lp4, xcorr, len>>2, max_pitch>>2, arch);
|
||
|
|
|
||
|
|
find_best_pitch(xcorr, y_lp4, len>>2, max_pitch>>2, best_pitch
|
||
|
|
#ifdef OPUS_FIXED_POINT
|
||
|
|
, 0, maxcorr
|
||
|
|
#endif
|
||
|
|
);
|
||
|
|
|
||
|
|
/* Finer search with 2x decimation */
|
||
|
|
#ifdef OPUS_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 OPUS_FIXED_POINT
|
||
|
|
maxcorr = MAX32(maxcorr, sum);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
find_best_pitch(xcorr, y, len>>1, max_pitch>>1, best_pitch
|
||
|
|
#ifdef OPUS_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,xy2;
|
||
|
|
opus_val32 xcorr[3];
|
||
|
|
opus_val32 best_xy, best_yy;
|
||
|
|
int offset;
|
||
|
|
int minperiod0;
|
||
|
|
VARDECL(opus_val32, yy_lookup);
|
||
|
|
SAVE_STACK;
|
||
|
|
|
||
|
|
minperiod0 = minperiod;
|
||
|
|
maxperiod /= 2;
|
||
|
|
minperiod /= 2;
|
||
|
|
*T0_ /= 2;
|
||
|
|
prev_period /= 2;
|
||
|
|
N /= 2;
|
||
|
|
x += maxperiod;
|
||
|
|
if (*T0_>=maxperiod)
|
||
|
|
*T0_=maxperiod-1;
|
||
|
|
|
||
|
|
T = T0 = *T0_;
|
||
|
|
ALLOC(yy_lookup, maxperiod+1, opus_val32);
|
||
|
|
dual_inner_prod(x, x, x-T0, N, &xx, &xy);
|
||
|
|
yy_lookup[0] = xx;
|
||
|
|
yy=xx;
|
||
|
|
for (i=1;i<=maxperiod;i++)
|
||
|
|
{
|
||
|
|
yy = yy+MULT16_16(x[-i],x[-i])-MULT16_16(x[N-i],x[N-i]);
|
||
|
|
yy_lookup[i] = MAX32(0, yy);
|
||
|
|
}
|
||
|
|
yy = yy_lookup[T0];
|
||
|
|
best_xy = xy;
|
||
|
|
best_yy = yy;
|
||
|
|
#ifdef OPUS_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;
|
||
|
|
opus_val16 thresh;
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
dual_inner_prod(x, &x[-T1], &x[-T1b], N, &xy, &xy2);
|
||
|
|
xy += xy2;
|
||
|
|
yy = yy_lookup[T1] + yy_lookup[T1b];
|
||
|
|
#ifdef OPUS_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;
|
||
|
|
thresh = MAX16(QCONST16(.3f,15), MULT16_16_Q15(QCONST16(.7f,15),g0)-cont);
|
||
|
|
/* Bias against very high pitch (very short period) to avoid false-positives
|
||
|
|
due to short-term correlation */
|
||
|
|
if (T1<3*minperiod)
|
||
|
|
thresh = MAX16(QCONST16(.4f,15), MULT16_16_Q15(QCONST16(.85f,15),g0)-cont);
|
||
|
|
else if (T1<2*minperiod)
|
||
|
|
thresh = MAX16(QCONST16(.5f,15), MULT16_16_Q15(QCONST16(.9f,15),g0)-cont);
|
||
|
|
if (g1 > thresh)
|
||
|
|
{
|
||
|
|
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;
|
||
|
|
RESTORE_STACK;
|
||
|
|
return pg;
|
||
|
|
}
|