538 lines
14 KiB
C
538 lines
14 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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@file pitch.c
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@brief Pitch analysis
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*/
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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 "pitch.h"
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#include "os_support.h"
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#include "modes.h"
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#include "stack_alloc.h"
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#include "mathops.h"
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#include "celt_lpc.h"
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static void find_best_pitch(opus_val32 *xcorr, opus_val16 *y, int len,
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int max_pitch, int *best_pitch
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#ifdef FIXED_POINT
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, int yshift, opus_val32 maxcorr
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#endif
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)
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{
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int i, j;
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opus_val32 Syy=1;
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opus_val16 best_num[2];
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opus_val32 best_den[2];
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#ifdef FIXED_POINT
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int xshift;
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xshift = celt_ilog2(maxcorr)-14;
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#endif
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best_num[0] = -1;
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best_num[1] = -1;
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best_den[0] = 0;
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best_den[1] = 0;
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best_pitch[0] = 0;
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best_pitch[1] = 1;
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for (j=0;j<len;j++)
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Syy = ADD32(Syy, SHR32(MULT16_16(y[j],y[j]), yshift));
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for (i=0;i<max_pitch;i++)
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{
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if (xcorr[i]>0)
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{
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opus_val16 num;
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opus_val32 xcorr16;
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xcorr16 = EXTRACT16(VSHR32(xcorr[i], xshift));
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#ifndef FIXED_POINT
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/* Considering the range of xcorr16, this should avoid both underflows
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and overflows (inf) when squaring xcorr16 */
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xcorr16 *= 1e-12f;
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#endif
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num = MULT16_16_Q15(xcorr16,xcorr16);
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if (MULT16_32_Q15(num,best_den[1]) > MULT16_32_Q15(best_num[1],Syy))
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{
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if (MULT16_32_Q15(num,best_den[0]) > MULT16_32_Q15(best_num[0],Syy))
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{
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best_num[1] = best_num[0];
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best_den[1] = best_den[0];
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best_pitch[1] = best_pitch[0];
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best_num[0] = num;
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best_den[0] = Syy;
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best_pitch[0] = i;
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} else {
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best_num[1] = num;
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best_den[1] = Syy;
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best_pitch[1] = i;
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}
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}
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}
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Syy += SHR32(MULT16_16(y[i+len],y[i+len]),yshift) - SHR32(MULT16_16(y[i],y[i]),yshift);
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Syy = MAX32(1, Syy);
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}
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}
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static void celt_fir5(opus_val16 *x,
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const opus_val16 *num,
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int N)
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{
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int i;
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opus_val16 num0, num1, num2, num3, num4;
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opus_val32 mem0, mem1, mem2, mem3, mem4;
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num0=num[0];
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num1=num[1];
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num2=num[2];
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num3=num[3];
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num4=num[4];
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mem0=0;
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mem1=0;
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mem2=0;
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mem3=0;
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mem4=0;
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for (i=0;i<N;i++)
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{
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opus_val32 sum = SHL32(EXTEND32(x[i]), SIG_SHIFT);
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sum = MAC16_16(sum,num0,mem0);
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sum = MAC16_16(sum,num1,mem1);
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sum = MAC16_16(sum,num2,mem2);
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sum = MAC16_16(sum,num3,mem3);
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sum = MAC16_16(sum,num4,mem4);
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mem4 = mem3;
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mem3 = mem2;
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mem2 = mem1;
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mem1 = mem0;
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mem0 = x[i];
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x[i] = ROUND16(sum, SIG_SHIFT);
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}
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}
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void pitch_downsample(celt_sig * OPUS_RESTRICT x[], opus_val16 * OPUS_RESTRICT x_lp,
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int len, int C, int arch)
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{
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int i;
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opus_val32 ac[5];
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opus_val16 tmp=Q15ONE;
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opus_val16 lpc[4];
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opus_val16 lpc2[5];
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opus_val16 c1 = QCONST16(.8f,15);
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#ifdef FIXED_POINT
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int shift;
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opus_val32 maxabs = celt_maxabs32(x[0], len);
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if (C==2)
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{
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opus_val32 maxabs_1 = celt_maxabs32(x[1], len);
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maxabs = MAX32(maxabs, maxabs_1);
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}
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if (maxabs<1)
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maxabs=1;
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shift = celt_ilog2(maxabs)-10;
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if (shift<0)
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shift=0;
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if (C==2)
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shift++;
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#endif
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for (i=1;i<len>>1;i++)
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x_lp[i] = SHR32(HALF32(HALF32(x[0][(2*i-1)]+x[0][(2*i+1)])+x[0][2*i]), shift);
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x_lp[0] = SHR32(HALF32(HALF32(x[0][1])+x[0][0]), shift);
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if (C==2)
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{
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for (i=1;i<len>>1;i++)
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x_lp[i] += SHR32(HALF32(HALF32(x[1][(2*i-1)]+x[1][(2*i+1)])+x[1][2*i]), shift);
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x_lp[0] += SHR32(HALF32(HALF32(x[1][1])+x[1][0]), shift);
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}
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_celt_autocorr(x_lp, ac, NULL, 0,
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4, len>>1, arch);
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/* Noise floor -40 dB */
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#ifdef FIXED_POINT
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ac[0] += SHR32(ac[0],13);
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#else
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ac[0] *= 1.0001f;
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#endif
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/* Lag windowing */
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for (i=1;i<=4;i++)
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{
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/*ac[i] *= exp(-.5*(2*M_PI*.002*i)*(2*M_PI*.002*i));*/
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#ifdef FIXED_POINT
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ac[i] -= MULT16_32_Q15(2*i*i, ac[i]);
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#else
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ac[i] -= ac[i]*(.008f*i)*(.008f*i);
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#endif
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}
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_celt_lpc(lpc, ac, 4);
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for (i=0;i<4;i++)
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{
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tmp = MULT16_16_Q15(QCONST16(.9f,15), tmp);
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lpc[i] = MULT16_16_Q15(lpc[i], tmp);
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}
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/* Add a zero */
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lpc2[0] = lpc[0] + QCONST16(.8f,SIG_SHIFT);
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lpc2[1] = lpc[1] + MULT16_16_Q15(c1,lpc[0]);
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lpc2[2] = lpc[2] + MULT16_16_Q15(c1,lpc[1]);
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lpc2[3] = lpc[3] + MULT16_16_Q15(c1,lpc[2]);
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lpc2[4] = MULT16_16_Q15(c1,lpc[3]);
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celt_fir5(x_lp, lpc2, len>>1);
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}
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/* Pure C implementation. */
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#ifdef FIXED_POINT
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opus_val32
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#else
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void
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#endif
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celt_pitch_xcorr_c(const opus_val16 *_x, const opus_val16 *_y,
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opus_val32 *xcorr, int len, int max_pitch, int arch)
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{
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#if 0 /* This is a simple version of the pitch correlation that should work
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well on DSPs like Blackfin and TI C5x/C6x */
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int i, j;
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#ifdef FIXED_POINT
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opus_val32 maxcorr=1;
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#endif
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#if !defined(OVERRIDE_PITCH_XCORR)
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(void)arch;
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#endif
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for (i=0;i<max_pitch;i++)
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{
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opus_val32 sum = 0;
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for (j=0;j<len;j++)
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sum = MAC16_16(sum, _x[j], _y[i+j]);
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xcorr[i] = sum;
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#ifdef FIXED_POINT
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maxcorr = MAX32(maxcorr, sum);
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#endif
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}
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#ifdef FIXED_POINT
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return maxcorr;
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#endif
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#else /* Unrolled version of the pitch correlation -- runs faster on x86 and ARM */
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int i;
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/*The EDSP version requires that max_pitch is at least 1, and that _x is
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32-bit aligned.
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Since it's hard to put asserts in assembly, put them here.*/
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#ifdef FIXED_POINT
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opus_val32 maxcorr=1;
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#endif
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celt_assert(max_pitch>0);
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celt_sig_assert((((unsigned char *)_x-(unsigned char *)NULL)&3)==0);
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for (i=0;i<max_pitch-3;i+=4)
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{
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opus_val32 sum[4]={0,0,0,0};
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xcorr_kernel(_x, _y+i, sum, len, arch);
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xcorr[i]=sum[0];
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xcorr[i+1]=sum[1];
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xcorr[i+2]=sum[2];
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xcorr[i+3]=sum[3];
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#ifdef FIXED_POINT
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sum[0] = MAX32(sum[0], sum[1]);
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sum[2] = MAX32(sum[2], sum[3]);
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sum[0] = MAX32(sum[0], sum[2]);
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maxcorr = MAX32(maxcorr, sum[0]);
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#endif
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}
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/* In case max_pitch isn't a multiple of 4, do non-unrolled version. */
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for (;i<max_pitch;i++)
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{
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opus_val32 sum;
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sum = celt_inner_prod(_x, _y+i, len, arch);
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xcorr[i] = sum;
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#ifdef FIXED_POINT
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maxcorr = MAX32(maxcorr, sum);
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#endif
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}
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#ifdef FIXED_POINT
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return maxcorr;
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#endif
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#endif
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}
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void pitch_search(const opus_val16 * OPUS_RESTRICT x_lp, opus_val16 * OPUS_RESTRICT y,
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int len, int max_pitch, int *pitch, int arch)
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{
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int i, j;
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int lag;
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int best_pitch[2]={0,0};
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VARDECL(opus_val16, x_lp4);
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VARDECL(opus_val16, y_lp4);
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VARDECL(opus_val32, xcorr);
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#ifdef FIXED_POINT
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opus_val32 maxcorr;
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opus_val32 xmax, ymax;
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int shift=0;
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#endif
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int offset;
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SAVE_STACK;
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celt_assert(len>0);
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celt_assert(max_pitch>0);
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lag = len+max_pitch;
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ALLOC(x_lp4, len>>2, opus_val16);
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ALLOC(y_lp4, lag>>2, opus_val16);
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ALLOC(xcorr, max_pitch>>1, opus_val32);
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/* Downsample by 2 again */
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for (j=0;j<len>>2;j++)
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x_lp4[j] = x_lp[2*j];
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for (j=0;j<lag>>2;j++)
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y_lp4[j] = y[2*j];
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#ifdef FIXED_POINT
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xmax = celt_maxabs16(x_lp4, len>>2);
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ymax = celt_maxabs16(y_lp4, lag>>2);
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shift = celt_ilog2(MAX32(1, MAX32(xmax, ymax)))-11;
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if (shift>0)
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{
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for (j=0;j<len>>2;j++)
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x_lp4[j] = SHR16(x_lp4[j], shift);
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for (j=0;j<lag>>2;j++)
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y_lp4[j] = SHR16(y_lp4[j], shift);
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/* Use double the shift for a MAC */
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shift *= 2;
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} else {
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shift = 0;
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}
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#endif
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/* Coarse search with 4x decimation */
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#ifdef FIXED_POINT
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maxcorr =
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#endif
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celt_pitch_xcorr(x_lp4, y_lp4, xcorr, len>>2, max_pitch>>2, arch);
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find_best_pitch(xcorr, y_lp4, len>>2, max_pitch>>2, best_pitch
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#ifdef FIXED_POINT
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, 0, maxcorr
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#endif
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);
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/* Finer search with 2x decimation */
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#ifdef FIXED_POINT
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maxcorr=1;
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#endif
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for (i=0;i<max_pitch>>1;i++)
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{
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opus_val32 sum;
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xcorr[i] = 0;
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if (abs(i-2*best_pitch[0])>2 && abs(i-2*best_pitch[1])>2)
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continue;
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#ifdef FIXED_POINT
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sum = 0;
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for (j=0;j<len>>1;j++)
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sum += SHR32(MULT16_16(x_lp[j],y[i+j]), shift);
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#else
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sum = celt_inner_prod(x_lp, y+i, len>>1, arch);
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#endif
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xcorr[i] = MAX32(-1, sum);
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#ifdef FIXED_POINT
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maxcorr = MAX32(maxcorr, sum);
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#endif
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}
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find_best_pitch(xcorr, y, len>>1, max_pitch>>1, best_pitch
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#ifdef FIXED_POINT
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, shift+1, maxcorr
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#endif
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);
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/* Refine by pseudo-interpolation */
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if (best_pitch[0]>0 && best_pitch[0]<(max_pitch>>1)-1)
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{
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opus_val32 a, b, c;
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a = xcorr[best_pitch[0]-1];
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b = xcorr[best_pitch[0]];
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c = xcorr[best_pitch[0]+1];
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if ((c-a) > MULT16_32_Q15(QCONST16(.7f,15),b-a))
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offset = 1;
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else if ((a-c) > MULT16_32_Q15(QCONST16(.7f,15),b-c))
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offset = -1;
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else
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offset = 0;
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} else {
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offset = 0;
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}
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*pitch = 2*best_pitch[0]-offset;
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RESTORE_STACK;
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}
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#ifdef FIXED_POINT
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static opus_val16 compute_pitch_gain(opus_val32 xy, opus_val32 xx, opus_val32 yy)
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{
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opus_val32 x2y2;
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int sx, sy, shift;
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opus_val32 g;
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opus_val16 den;
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if (xy == 0 || xx == 0 || yy == 0)
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return 0;
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sx = celt_ilog2(xx)-14;
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sy = celt_ilog2(yy)-14;
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shift = sx + sy;
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x2y2 = SHR32(MULT16_16(VSHR32(xx, sx), VSHR32(yy, sy)), 14);
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if (shift & 1) {
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if (x2y2 < 32768)
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{
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x2y2 <<= 1;
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shift--;
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} else {
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x2y2 >>= 1;
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shift++;
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}
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}
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den = celt_rsqrt_norm(x2y2);
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g = MULT16_32_Q15(den, xy);
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g = VSHR32(g, (shift>>1)-1);
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return EXTRACT16(MIN32(g, Q15ONE));
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}
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#else
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static opus_val16 compute_pitch_gain(opus_val32 xy, opus_val32 xx, opus_val32 yy)
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{
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return xy/celt_sqrt(1+xx*yy);
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}
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#endif
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static const int second_check[16] = {0, 0, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2};
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opus_val16 remove_doubling(opus_val16 *x, int maxperiod, int minperiod,
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int N, int *T0_, int prev_period, opus_val16 prev_gain, int arch)
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{
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int k, i, T, T0;
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opus_val16 g, g0;
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opus_val16 pg;
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opus_val32 xy,xx,yy,xy2;
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opus_val32 xcorr[3];
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opus_val32 best_xy, best_yy;
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int offset;
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int minperiod0;
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VARDECL(opus_val32, yy_lookup);
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SAVE_STACK;
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minperiod0 = minperiod;
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maxperiod /= 2;
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minperiod /= 2;
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*T0_ /= 2;
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prev_period /= 2;
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N /= 2;
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x += maxperiod;
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if (*T0_>=maxperiod)
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*T0_=maxperiod-1;
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T = T0 = *T0_;
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ALLOC(yy_lookup, maxperiod+1, opus_val32);
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dual_inner_prod(x, x, x-T0, N, &xx, &xy, arch);
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yy_lookup[0] = xx;
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yy=xx;
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for (i=1;i<=maxperiod;i++)
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{
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yy = yy+MULT16_16(x[-i],x[-i])-MULT16_16(x[N-i],x[N-i]);
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yy_lookup[i] = MAX32(0, yy);
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}
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yy = yy_lookup[T0];
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best_xy = xy;
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best_yy = yy;
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g = g0 = compute_pitch_gain(xy, xx, yy);
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/* Look for any pitch at T/k */
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for (k=2;k<=15;k++)
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{
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int T1, T1b;
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opus_val16 g1;
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opus_val16 cont=0;
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|
opus_val16 thresh;
|
|
T1 = celt_udiv(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 = celt_udiv(2*second_check[k]*T0+k, 2*k);
|
|
}
|
|
dual_inner_prod(x, &x[-T1], &x[-T1b], N, &xy, &xy2, arch);
|
|
xy = HALF32(xy + xy2);
|
|
yy = HALF32(yy_lookup[T1] + yy_lookup[T1b]);
|
|
g1 = compute_pitch_gain(xy, xx, yy);
|
|
if (abs(T1-prev_period)<=1)
|
|
cont = prev_gain;
|
|
else if (abs(T1-prev_period)<=2 && 5*k*k < T0)
|
|
cont = HALF16(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++)
|
|
xcorr[k] = celt_inner_prod(x, x-(T+k-1), N, arch);
|
|
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;
|
|
}
|