diff options
Diffstat (limited to 'src/opus-1.0.2/celt/celt_lpc.c')
| -rw-r--r-- | src/opus-1.0.2/celt/celt_lpc.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/src/opus-1.0.2/celt/celt_lpc.c b/src/opus-1.0.2/celt/celt_lpc.c deleted file mode 100644 index d2addbf2..00000000 --- a/src/opus-1.0.2/celt/celt_lpc.c +++ /dev/null @@ -1,188 +0,0 @@ -/* 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" - -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 - - for (i = 0; i < p; i++) - lpc[i] = 0; - 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(const opus_val16 *x, - const opus_val16 *num, - opus_val16 *y, - int N, - int ord, - opus_val16 *mem) -{ - int i,j; - - for (i=0;i<N;i++) - { - opus_val32 sum = SHL32(EXTEND32(x[i]), SIG_SHIFT); - for (j=0;j<ord;j++) - { - sum += MULT16_16(num[j],mem[j]); - } - for (j=ord-1;j>=1;j--) - { - mem[j]=mem[j-1]; - } - mem[0] = x[i]; - y[i] = ROUND16(sum, SIG_SHIFT); - } -} - -void celt_iir(const opus_val32 *x, - const opus_val16 *den, - opus_val32 *y, - int N, - int ord, - opus_val16 *mem) -{ - int i,j; - 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; - } -} - -void _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 - ) -{ - opus_val32 d; - int i; - VARDECL(opus_val16, xx); - SAVE_STACK; - ALLOC(xx, n, opus_val16); - celt_assert(n>0); - celt_assert(overlap>=0); - 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]); - } -#ifdef FIXED_POINT - { - opus_val32 ac0=0; - int shift; - for(i=0;i<n;i++) - ac0 += SHR32(MULT16_16(xx[i],xx[i]),9); - ac0 += 1+n; - - shift = celt_ilog2(ac0)-30+10; - shift = (shift+1)/2; - for(i=0;i<n;i++) - xx[i] = VSHR32(xx[i], shift); - } -#endif - while (lag>=0) - { - for (i = lag, d = 0; i < n; i++) - d += xx[i] * xx[i-lag]; - ac[lag] = d; - /*printf ("%f ", ac[lag]);*/ - lag--; - } - /*printf ("\n");*/ - ac[0] += 10; - - RESTORE_STACK; -} |