297 lines
7.8 KiB
C
297 lines
7.8 KiB
C
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/* Copyright (c) 2009-2010 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 "celt_lpc.h"
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#include "stack_alloc.h"
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#include "mathops.h"
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#include "pitch.h"
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void _celt_lpc(
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opus_val16 *_lpc, /* out: [0...p-1] LPC coefficients */
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const opus_val32 *ac, /* in: [0...p] autocorrelation values */
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int p
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)
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{
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int i, j;
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opus_val32 r;
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opus_val32 error = ac[0];
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#ifdef FIXED_POINT
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opus_val32 lpc[LPC_ORDER];
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#else
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float *lpc = _lpc;
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#endif
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OPUS_CLEAR(lpc, p);
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if (ac[0] != 0)
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{
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for (i = 0; i < p; i++) {
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/* Sum up this iteration's reflection coefficient */
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opus_val32 rr = 0;
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for (j = 0; j < i; j++)
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rr += MULT32_32_Q31(lpc[j],ac[i - j]);
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rr += SHR32(ac[i + 1],3);
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r = -frac_div32(SHL32(rr,3), error);
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/* Update LPC coefficients and total error */
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lpc[i] = SHR32(r,3);
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for (j = 0; j < (i+1)>>1; j++)
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{
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opus_val32 tmp1, tmp2;
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tmp1 = lpc[j];
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tmp2 = lpc[i-1-j];
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lpc[j] = tmp1 + MULT32_32_Q31(r,tmp2);
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lpc[i-1-j] = tmp2 + MULT32_32_Q31(r,tmp1);
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}
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error = error - MULT32_32_Q31(MULT32_32_Q31(r,r),error);
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/* Bail out once we get 30 dB gain */
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#ifdef FIXED_POINT
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if (error<SHR32(ac[0],10))
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break;
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#else
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if (error<.001f*ac[0])
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break;
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#endif
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}
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}
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#ifdef FIXED_POINT
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for (i=0;i<p;i++)
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_lpc[i] = ROUND16(lpc[i],16);
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#endif
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}
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void celt_fir_c(
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const opus_val16 *x,
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const opus_val16 *num,
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opus_val16 *y,
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int N,
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int ord,
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int arch)
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{
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int i,j;
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VARDECL(opus_val16, rnum);
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SAVE_STACK;
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celt_assert(x != y);
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ALLOC(rnum, ord, opus_val16);
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for(i=0;i<ord;i++)
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rnum[i] = num[ord-i-1];
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for (i=0;i<N-3;i+=4)
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{
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opus_val32 sum[4];
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sum[0] = SHL32(EXTEND32(x[i ]), SIG_SHIFT);
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sum[1] = SHL32(EXTEND32(x[i+1]), SIG_SHIFT);
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sum[2] = SHL32(EXTEND32(x[i+2]), SIG_SHIFT);
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sum[3] = SHL32(EXTEND32(x[i+3]), SIG_SHIFT);
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xcorr_kernel(rnum, x+i-ord, sum, ord, arch);
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y[i ] = ROUND16(sum[0], SIG_SHIFT);
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y[i+1] = ROUND16(sum[1], SIG_SHIFT);
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y[i+2] = ROUND16(sum[2], SIG_SHIFT);
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y[i+3] = ROUND16(sum[3], SIG_SHIFT);
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}
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for (;i<N;i++)
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{
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opus_val32 sum = SHL32(EXTEND32(x[i]), SIG_SHIFT);
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for (j=0;j<ord;j++)
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sum = MAC16_16(sum,rnum[j],x[i+j-ord]);
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y[i] = ROUND16(sum, SIG_SHIFT);
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}
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RESTORE_STACK;
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}
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void celt_iir(const opus_val32 *_x,
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const opus_val16 *den,
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opus_val32 *_y,
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int N,
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int ord,
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opus_val16 *mem,
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int arch)
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{
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#ifdef SMALL_FOOTPRINT
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int i,j;
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(void)arch;
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for (i=0;i<N;i++)
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{
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opus_val32 sum = _x[i];
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for (j=0;j<ord;j++)
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{
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sum -= MULT16_16(den[j],mem[j]);
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}
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for (j=ord-1;j>=1;j--)
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{
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mem[j]=mem[j-1];
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}
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mem[0] = SROUND16(sum, SIG_SHIFT);
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_y[i] = sum;
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}
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#else
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int i,j;
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VARDECL(opus_val16, rden);
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VARDECL(opus_val16, y);
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SAVE_STACK;
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celt_assert((ord&3)==0);
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ALLOC(rden, ord, opus_val16);
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ALLOC(y, N+ord, opus_val16);
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for(i=0;i<ord;i++)
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rden[i] = den[ord-i-1];
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for(i=0;i<ord;i++)
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y[i] = -mem[ord-i-1];
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for(;i<N+ord;i++)
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y[i]=0;
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for (i=0;i<N-3;i+=4)
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{
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/* Unroll by 4 as if it were an FIR filter */
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opus_val32 sum[4];
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sum[0]=_x[i];
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sum[1]=_x[i+1];
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sum[2]=_x[i+2];
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sum[3]=_x[i+3];
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xcorr_kernel(rden, y+i, sum, ord, arch);
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/* Patch up the result to compensate for the fact that this is an IIR */
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y[i+ord ] = -SROUND16(sum[0],SIG_SHIFT);
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_y[i ] = sum[0];
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sum[1] = MAC16_16(sum[1], y[i+ord ], den[0]);
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y[i+ord+1] = -SROUND16(sum[1],SIG_SHIFT);
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_y[i+1] = sum[1];
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sum[2] = MAC16_16(sum[2], y[i+ord+1], den[0]);
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sum[2] = MAC16_16(sum[2], y[i+ord ], den[1]);
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y[i+ord+2] = -SROUND16(sum[2],SIG_SHIFT);
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_y[i+2] = sum[2];
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sum[3] = MAC16_16(sum[3], y[i+ord+2], den[0]);
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sum[3] = MAC16_16(sum[3], y[i+ord+1], den[1]);
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sum[3] = MAC16_16(sum[3], y[i+ord ], den[2]);
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y[i+ord+3] = -SROUND16(sum[3],SIG_SHIFT);
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_y[i+3] = sum[3];
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}
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for (;i<N;i++)
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{
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opus_val32 sum = _x[i];
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for (j=0;j<ord;j++)
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sum -= MULT16_16(rden[j],y[i+j]);
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y[i+ord] = SROUND16(sum,SIG_SHIFT);
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_y[i] = sum;
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}
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for(i=0;i<ord;i++)
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mem[i] = _y[N-i-1];
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RESTORE_STACK;
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#endif
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}
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int _celt_autocorr(
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const opus_val16 *x, /* in: [0...n-1] samples x */
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opus_val32 *ac, /* out: [0...lag-1] ac values */
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const opus_val16 *window,
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int overlap,
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int lag,
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int n,
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int arch
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)
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{
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opus_val32 d;
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int i, k;
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int fastN=n-lag;
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int shift;
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const opus_val16 *xptr;
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VARDECL(opus_val16, xx);
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SAVE_STACK;
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ALLOC(xx, n, opus_val16);
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celt_assert(n>0);
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celt_assert(overlap>=0);
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if (overlap == 0)
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{
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xptr = x;
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} else {
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for (i=0;i<n;i++)
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xx[i] = x[i];
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for (i=0;i<overlap;i++)
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{
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xx[i] = MULT16_16_Q15(x[i],window[i]);
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xx[n-i-1] = MULT16_16_Q15(x[n-i-1],window[i]);
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}
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xptr = xx;
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}
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shift=0;
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#ifdef FIXED_POINT
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{
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opus_val32 ac0;
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ac0 = 1+(n<<7);
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if (n&1) ac0 += SHR32(MULT16_16(xptr[0],xptr[0]),9);
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for(i=(n&1);i<n;i+=2)
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{
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ac0 += SHR32(MULT16_16(xptr[i],xptr[i]),9);
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ac0 += SHR32(MULT16_16(xptr[i+1],xptr[i+1]),9);
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}
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shift = celt_ilog2(ac0)-30+10;
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shift = (shift)/2;
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if (shift>0)
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{
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for(i=0;i<n;i++)
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xx[i] = PSHR32(xptr[i], shift);
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xptr = xx;
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} else
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shift = 0;
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}
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#endif
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celt_pitch_xcorr(xptr, xptr, ac, fastN, lag+1, arch);
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for (k=0;k<=lag;k++)
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{
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for (i = k+fastN, d = 0; i < n; i++)
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d = MAC16_16(d, xptr[i], xptr[i-k]);
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ac[k] += d;
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}
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#ifdef FIXED_POINT
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shift = 2*shift;
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if (shift<=0)
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ac[0] += SHL32((opus_int32)1, -shift);
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if (ac[0] < 268435456)
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{
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int shift2 = 29 - EC_ILOG(ac[0]);
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for (i=0;i<=lag;i++)
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ac[i] = SHL32(ac[i], shift2);
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shift -= shift2;
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} else if (ac[0] >= 536870912)
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{
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int shift2=1;
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if (ac[0] >= 1073741824)
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shift2++;
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for (i=0;i<=lag;i++)
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ac[i] = SHR32(ac[i], shift2);
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shift += shift2;
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}
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#endif
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RESTORE_STACK;
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return shift;
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}
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