mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-29 15:17:11 +01:00
315 lines
8.3 KiB
C
315 lines
8.3 KiB
C
/* Copyright (c) 2009-2010 Xiph.Org Foundation
|
|
Written by Jean-Marc Valin */
|
|
/*
|
|
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 "celt_lpc.h"
|
|
#include "stack_alloc.h"
|
|
#include "mathops.h"
|
|
#include "pitch.h"
|
|
|
|
void _celt_lpc(
|
|
opus_val16 *_lpc, /* out: [0...p-1] LPC coefficients */
|
|
const opus_val32 *ac, /* in: [0...p] autocorrelation values */
|
|
int p
|
|
)
|
|
{
|
|
int i, j;
|
|
opus_val32 r;
|
|
opus_val32 error = ac[0];
|
|
#ifdef FIXED_POINT
|
|
opus_val32 lpc[LPC_ORDER];
|
|
#else
|
|
float *lpc = _lpc;
|
|
#endif
|
|
|
|
OPUS_CLEAR(lpc, p);
|
|
if (ac[0] != 0)
|
|
{
|
|
for (i = 0; i < p; i++) {
|
|
/* Sum up this iteration's reflection coefficient */
|
|
opus_val32 rr = 0;
|
|
for (j = 0; j < i; j++)
|
|
rr += MULT32_32_Q31(lpc[j],ac[i - j]);
|
|
rr += SHR32(ac[i + 1],3);
|
|
r = -frac_div32(SHL32(rr,3), error);
|
|
/* Update LPC coefficients and total error */
|
|
lpc[i] = SHR32(r,3);
|
|
for (j = 0; j < (i+1)>>1; j++)
|
|
{
|
|
opus_val32 tmp1, tmp2;
|
|
tmp1 = lpc[j];
|
|
tmp2 = lpc[i-1-j];
|
|
lpc[j] = tmp1 + MULT32_32_Q31(r,tmp2);
|
|
lpc[i-1-j] = tmp2 + MULT32_32_Q31(r,tmp1);
|
|
}
|
|
|
|
error = error - MULT32_32_Q31(MULT32_32_Q31(r,r),error);
|
|
/* Bail out once we get 30 dB gain */
|
|
#ifdef FIXED_POINT
|
|
if (error<SHR32(ac[0],10))
|
|
break;
|
|
#else
|
|
if (error<.001f*ac[0])
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
#ifdef FIXED_POINT
|
|
for (i=0;i<p;i++)
|
|
_lpc[i] = ROUND16(lpc[i],16);
|
|
#endif
|
|
}
|
|
|
|
|
|
void celt_fir_c(
|
|
const opus_val16 *_x,
|
|
const opus_val16 *num,
|
|
opus_val16 *_y,
|
|
int N,
|
|
int ord,
|
|
opus_val16 *mem,
|
|
int arch)
|
|
{
|
|
int i,j;
|
|
VARDECL(opus_val16, rnum);
|
|
VARDECL(opus_val16, x);
|
|
SAVE_STACK;
|
|
|
|
ALLOC(rnum, ord, opus_val16);
|
|
ALLOC(x, N+ord, opus_val16);
|
|
for(i=0;i<ord;i++)
|
|
rnum[i] = num[ord-i-1];
|
|
for(i=0;i<ord;i++)
|
|
x[i] = mem[ord-i-1];
|
|
for (i=0;i<N;i++)
|
|
x[i+ord]=_x[i];
|
|
for(i=0;i<ord;i++)
|
|
mem[i] = _x[N-i-1];
|
|
#ifdef SMALL_FOOTPRINT
|
|
(void)arch;
|
|
for (i=0;i<N;i++)
|
|
{
|
|
opus_val32 sum = SHL32(EXTEND32(_x[i]), SIG_SHIFT);
|
|
for (j=0;j<ord;j++)
|
|
{
|
|
sum = MAC16_16(sum,rnum[j],x[i+j]);
|
|
}
|
|
_y[i] = SATURATE16(PSHR32(sum, SIG_SHIFT));
|
|
}
|
|
#else
|
|
for (i=0;i<N-3;i+=4)
|
|
{
|
|
opus_val32 sum[4]={0,0,0,0};
|
|
xcorr_kernel(rnum, x+i, sum, ord, arch);
|
|
_y[i ] = SATURATE16(ADD32(EXTEND32(_x[i ]), PSHR32(sum[0], SIG_SHIFT)));
|
|
_y[i+1] = SATURATE16(ADD32(EXTEND32(_x[i+1]), PSHR32(sum[1], SIG_SHIFT)));
|
|
_y[i+2] = SATURATE16(ADD32(EXTEND32(_x[i+2]), PSHR32(sum[2], SIG_SHIFT)));
|
|
_y[i+3] = SATURATE16(ADD32(EXTEND32(_x[i+3]), PSHR32(sum[3], SIG_SHIFT)));
|
|
}
|
|
for (;i<N;i++)
|
|
{
|
|
opus_val32 sum = 0;
|
|
for (j=0;j<ord;j++)
|
|
sum = MAC16_16(sum,rnum[j],x[i+j]);
|
|
_y[i] = SATURATE16(ADD32(EXTEND32(_x[i]), PSHR32(sum, SIG_SHIFT)));
|
|
}
|
|
#endif
|
|
RESTORE_STACK;
|
|
}
|
|
|
|
void celt_iir(const opus_val32 *_x,
|
|
const opus_val16 *den,
|
|
opus_val32 *_y,
|
|
int N,
|
|
int ord,
|
|
opus_val16 *mem,
|
|
int arch)
|
|
{
|
|
#ifdef SMALL_FOOTPRINT
|
|
int i,j;
|
|
(void)arch;
|
|
for (i=0;i<N;i++)
|
|
{
|
|
opus_val32 sum = _x[i];
|
|
for (j=0;j<ord;j++)
|
|
{
|
|
sum -= MULT16_16(den[j],mem[j]);
|
|
}
|
|
for (j=ord-1;j>=1;j--)
|
|
{
|
|
mem[j]=mem[j-1];
|
|
}
|
|
mem[0] = ROUND16(sum,SIG_SHIFT);
|
|
_y[i] = sum;
|
|
}
|
|
#else
|
|
int i,j;
|
|
VARDECL(opus_val16, rden);
|
|
VARDECL(opus_val16, y);
|
|
SAVE_STACK;
|
|
|
|
celt_assert((ord&3)==0);
|
|
ALLOC(rden, ord, opus_val16);
|
|
ALLOC(y, N+ord, opus_val16);
|
|
for(i=0;i<ord;i++)
|
|
rden[i] = den[ord-i-1];
|
|
for(i=0;i<ord;i++)
|
|
y[i] = -mem[ord-i-1];
|
|
for(;i<N+ord;i++)
|
|
y[i]=0;
|
|
for (i=0;i<N-3;i+=4)
|
|
{
|
|
/* Unroll by 4 as if it were an FIR filter */
|
|
opus_val32 sum[4];
|
|
sum[0]=_x[i];
|
|
sum[1]=_x[i+1];
|
|
sum[2]=_x[i+2];
|
|
sum[3]=_x[i+3];
|
|
xcorr_kernel(rden, y+i, sum, ord, arch);
|
|
|
|
/* Patch up the result to compensate for the fact that this is an IIR */
|
|
y[i+ord ] = -ROUND16(sum[0],SIG_SHIFT);
|
|
_y[i ] = sum[0];
|
|
sum[1] = MAC16_16(sum[1], y[i+ord ], den[0]);
|
|
y[i+ord+1] = -ROUND16(sum[1],SIG_SHIFT);
|
|
_y[i+1] = sum[1];
|
|
sum[2] = MAC16_16(sum[2], y[i+ord+1], den[0]);
|
|
sum[2] = MAC16_16(sum[2], y[i+ord ], den[1]);
|
|
y[i+ord+2] = -ROUND16(sum[2],SIG_SHIFT);
|
|
_y[i+2] = sum[2];
|
|
|
|
sum[3] = MAC16_16(sum[3], y[i+ord+2], den[0]);
|
|
sum[3] = MAC16_16(sum[3], y[i+ord+1], den[1]);
|
|
sum[3] = MAC16_16(sum[3], y[i+ord ], den[2]);
|
|
y[i+ord+3] = -ROUND16(sum[3],SIG_SHIFT);
|
|
_y[i+3] = sum[3];
|
|
}
|
|
for (;i<N;i++)
|
|
{
|
|
opus_val32 sum = _x[i];
|
|
for (j=0;j<ord;j++)
|
|
sum -= MULT16_16(rden[j],y[i+j]);
|
|
y[i+ord] = ROUND16(sum,SIG_SHIFT);
|
|
_y[i] = sum;
|
|
}
|
|
for(i=0;i<ord;i++)
|
|
mem[i] = _y[N-i-1];
|
|
RESTORE_STACK;
|
|
#endif
|
|
}
|
|
|
|
int _celt_autocorr(
|
|
const opus_val16 *x, /* in: [0...n-1] samples x */
|
|
opus_val32 *ac, /* out: [0...lag-1] ac values */
|
|
const opus_val16 *window,
|
|
int overlap,
|
|
int lag,
|
|
int n,
|
|
int arch
|
|
)
|
|
{
|
|
opus_val32 d;
|
|
int i, k;
|
|
int fastN=n-lag;
|
|
int shift;
|
|
const opus_val16 *xptr;
|
|
VARDECL(opus_val16, xx);
|
|
SAVE_STACK;
|
|
ALLOC(xx, n, opus_val16);
|
|
celt_assert(n>0);
|
|
celt_assert(overlap>=0);
|
|
if (overlap == 0)
|
|
{
|
|
xptr = x;
|
|
} else {
|
|
for (i=0;i<n;i++)
|
|
xx[i] = x[i];
|
|
for (i=0;i<overlap;i++)
|
|
{
|
|
xx[i] = MULT16_16_Q15(x[i],window[i]);
|
|
xx[n-i-1] = MULT16_16_Q15(x[n-i-1],window[i]);
|
|
}
|
|
xptr = xx;
|
|
}
|
|
shift=0;
|
|
#ifdef FIXED_POINT
|
|
{
|
|
opus_val32 ac0;
|
|
ac0 = 1+(n<<7);
|
|
if (n&1) ac0 += SHR32(MULT16_16(xptr[0],xptr[0]),9);
|
|
for(i=(n&1);i<n;i+=2)
|
|
{
|
|
ac0 += SHR32(MULT16_16(xptr[i],xptr[i]),9);
|
|
ac0 += SHR32(MULT16_16(xptr[i+1],xptr[i+1]),9);
|
|
}
|
|
|
|
shift = celt_ilog2(ac0)-30+10;
|
|
shift = (shift)/2;
|
|
if (shift>0)
|
|
{
|
|
for(i=0;i<n;i++)
|
|
xx[i] = PSHR32(xptr[i], shift);
|
|
xptr = xx;
|
|
} else
|
|
shift = 0;
|
|
}
|
|
#endif
|
|
celt_pitch_xcorr(xptr, xptr, ac, fastN, lag+1, arch);
|
|
for (k=0;k<=lag;k++)
|
|
{
|
|
for (i = k+fastN, d = 0; i < n; i++)
|
|
d = MAC16_16(d, xptr[i], xptr[i-k]);
|
|
ac[k] += d;
|
|
}
|
|
#ifdef FIXED_POINT
|
|
shift = 2*shift;
|
|
if (shift<=0)
|
|
ac[0] += SHL32((opus_int32)1, -shift);
|
|
if (ac[0] < 268435456)
|
|
{
|
|
int shift2 = 29 - EC_ILOG(ac[0]);
|
|
for (i=0;i<=lag;i++)
|
|
ac[i] = SHL32(ac[i], shift2);
|
|
shift -= shift2;
|
|
} else if (ac[0] >= 536870912)
|
|
{
|
|
int shift2=1;
|
|
if (ac[0] >= 1073741824)
|
|
shift2++;
|
|
for (i=0;i<=lag;i++)
|
|
ac[i] = SHR32(ac[i], shift2);
|
|
shift += shift2;
|
|
}
|
|
#endif
|
|
|
|
RESTORE_STACK;
|
|
return shift;
|
|
}
|