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822 lines
24 KiB
C
822 lines
24 KiB
C
/* Copyright (C) 2002-2006 Jean-Marc Valin
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File: filters.c
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Various analysis/synthesis filters
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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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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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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 FOUNDATION OR
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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 "filters.h"
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#include "stack_alloc.h"
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#include "arch.h"
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#include "math_approx.h"
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#include "ltp.h"
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#include <math.h>
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#ifdef _USE_SSE
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#include "filters_sse.h"
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#elif defined (ARM4_ASM) || defined(ARM5E_ASM)
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#include "filters_arm4.h"
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#elif defined (BFIN_ASM)
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#include "filters_bfin.h"
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#endif
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void bw_lpc(spx_word16_t gamma, const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order)
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{
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int i;
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spx_word16_t tmp=gamma;
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for (i=0;i<order;i++)
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{
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lpc_out[i] = MULT16_16_P15(tmp,lpc_in[i]);
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tmp = MULT16_16_P15(tmp, gamma);
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}
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}
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void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len)
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{
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int i;
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for (i=0;i<len;i++)
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{
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/* It's important we do the test that way so we can catch NaNs, which are neither greater nor smaller */
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if (!(vec[i]>=min_val && vec[i] <= max_val))
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{
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if (vec[i] < min_val)
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vec[i] = min_val;
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else if (vec[i] > max_val)
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vec[i] = max_val;
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else /* Has to be NaN */
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vec[i] = 0;
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}
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}
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}
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void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem)
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{
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int i;
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#ifdef FIXED_POINT
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const spx_word16_t Pcoef[5][3] = {{16384, -31313, 14991}, {16384, -31569, 15249}, {16384, -31677, 15328}, {16384, -32313, 15947}, {16384, -22446, 6537}};
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const spx_word16_t Zcoef[5][3] = {{15672, -31344, 15672}, {15802, -31601, 15802}, {15847, -31694, 15847}, {16162, -32322, 16162}, {14418, -28836, 14418}};
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#else
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const spx_word16_t Pcoef[5][3] = {{1.00000f, -1.91120f, 0.91498f}, {1.00000f, -1.92683f, 0.93071f}, {1.00000f, -1.93338f, 0.93553f}, {1.00000f, -1.97226f, 0.97332f}, {1.00000f, -1.37000f, 0.39900f}};
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const spx_word16_t Zcoef[5][3] = {{0.95654f, -1.91309f, 0.95654f}, {0.96446f, -1.92879f, 0.96446f}, {0.96723f, -1.93445f, 0.96723f}, {0.98645f, -1.97277f, 0.98645f}, {0.88000f, -1.76000f, 0.88000f}};
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#endif
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const spx_word16_t *den, *num;
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if (filtID>4)
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filtID=4;
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den = Pcoef[filtID]; num = Zcoef[filtID];
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/*return;*/
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for (i=0;i<len;i++)
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{
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spx_word16_t yi;
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spx_word32_t vout = ADD32(MULT16_16(num[0], x[i]),mem[0]);
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yi = EXTRACT16(SATURATE(PSHR32(vout,14),32767));
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mem[0] = ADD32(MAC16_16(mem[1], num[1],x[i]), SHL32(MULT16_32_Q15(-den[1],vout),1));
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mem[1] = ADD32(MULT16_16(num[2],x[i]), SHL32(MULT16_32_Q15(-den[2],vout),1));
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y[i] = yi;
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}
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}
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#ifdef FIXED_POINT
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/* FIXME: These functions are ugly and probably introduce too much error */
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void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len)
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{
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int i;
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for (i=0;i<len;i++)
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{
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y[i] = SHL32(MULT16_32_Q14(EXTRACT16(SHR32(x[i],7)),scale),7);
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}
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}
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void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len)
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{
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int i;
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if (scale > SHL32(EXTEND32(SIG_SCALING), 8))
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{
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spx_word16_t scale_1;
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scale = PSHR32(scale, SIG_SHIFT);
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scale_1 = EXTRACT16(PDIV32_16(SHL32(EXTEND32(SIG_SCALING),7),scale));
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for (i=0;i<len;i++)
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{
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y[i] = MULT16_16_P15(scale_1, x[i]);
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}
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} else if (scale > SHR32(EXTEND32(SIG_SCALING), 2)) {
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spx_word16_t scale_1;
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scale = PSHR32(scale, SIG_SHIFT-5);
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scale_1 = DIV32_16(SHL32(EXTEND32(SIG_SCALING),3),scale);
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for (i=0;i<len;i++)
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{
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y[i] = PSHR32(MULT16_16(scale_1, SHL16(x[i],2)),8);
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}
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} else {
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spx_word16_t scale_1;
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scale = PSHR32(scale, SIG_SHIFT-7);
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if (scale < 5)
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scale = 5;
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scale_1 = DIV32_16(SHL32(EXTEND32(SIG_SCALING),3),scale);
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for (i=0;i<len;i++)
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{
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y[i] = PSHR32(MULT16_16(scale_1, SHL16(x[i],2)),6);
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}
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}
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}
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#else
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void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len)
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{
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int i;
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for (i=0;i<len;i++)
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y[i] = scale*x[i];
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}
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void signal_div(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len)
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{
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int i;
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float scale_1 = 1/scale;
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for (i=0;i<len;i++)
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y[i] = scale_1*x[i];
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}
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#endif
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#ifdef FIXED_POINT
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spx_word16_t compute_rms(const spx_sig_t *x, int len)
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{
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int i;
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spx_word32_t sum=0;
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spx_sig_t max_val=1;
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int sig_shift;
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for (i=0;i<len;i++)
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{
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spx_sig_t tmp = x[i];
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if (tmp<0)
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tmp = -tmp;
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if (tmp > max_val)
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max_val = tmp;
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}
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sig_shift=0;
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while (max_val>16383)
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{
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sig_shift++;
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max_val >>= 1;
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}
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for (i=0;i<len;i+=4)
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{
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spx_word32_t sum2=0;
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spx_word16_t tmp;
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tmp = EXTRACT16(SHR32(x[i],sig_shift));
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sum2 = MAC16_16(sum2,tmp,tmp);
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tmp = EXTRACT16(SHR32(x[i+1],sig_shift));
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sum2 = MAC16_16(sum2,tmp,tmp);
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tmp = EXTRACT16(SHR32(x[i+2],sig_shift));
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sum2 = MAC16_16(sum2,tmp,tmp);
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tmp = EXTRACT16(SHR32(x[i+3],sig_shift));
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sum2 = MAC16_16(sum2,tmp,tmp);
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sum = ADD32(sum,SHR32(sum2,6));
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}
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return EXTRACT16(PSHR32(SHL32(EXTEND32(spx_sqrt(DIV32(sum,len))),(sig_shift+3)),SIG_SHIFT));
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}
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spx_word16_t compute_rms16(const spx_word16_t *x, int len)
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{
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int i;
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spx_word16_t max_val=10;
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for (i=0;i<len;i++)
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{
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spx_sig_t tmp = x[i];
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if (tmp<0)
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tmp = -tmp;
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if (tmp > max_val)
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max_val = tmp;
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}
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if (max_val>16383)
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{
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spx_word32_t sum=0;
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for (i=0;i<len;i+=4)
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{
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spx_word32_t sum2=0;
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sum2 = MAC16_16(sum2,SHR16(x[i],1),SHR16(x[i],1));
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sum2 = MAC16_16(sum2,SHR16(x[i+1],1),SHR16(x[i+1],1));
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sum2 = MAC16_16(sum2,SHR16(x[i+2],1),SHR16(x[i+2],1));
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sum2 = MAC16_16(sum2,SHR16(x[i+3],1),SHR16(x[i+3],1));
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sum = ADD32(sum,SHR32(sum2,6));
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}
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return SHL16(spx_sqrt(DIV32(sum,len)),4);
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} else {
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spx_word32_t sum=0;
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int sig_shift=0;
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if (max_val < 8192)
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sig_shift=1;
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if (max_val < 4096)
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sig_shift=2;
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if (max_val < 2048)
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sig_shift=3;
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for (i=0;i<len;i+=4)
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{
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spx_word32_t sum2=0;
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sum2 = MAC16_16(sum2,SHL16(x[i],sig_shift),SHL16(x[i],sig_shift));
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sum2 = MAC16_16(sum2,SHL16(x[i+1],sig_shift),SHL16(x[i+1],sig_shift));
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sum2 = MAC16_16(sum2,SHL16(x[i+2],sig_shift),SHL16(x[i+2],sig_shift));
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sum2 = MAC16_16(sum2,SHL16(x[i+3],sig_shift),SHL16(x[i+3],sig_shift));
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sum = ADD32(sum,SHR32(sum2,6));
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}
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return SHL16(spx_sqrt(DIV32(sum,len)),3-sig_shift);
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}
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}
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#ifndef OVERRIDE_NORMALIZE16
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int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len)
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{
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int i;
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spx_sig_t max_val=1;
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int sig_shift;
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for (i=0;i<len;i++)
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{
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spx_sig_t tmp = x[i];
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if (tmp<0)
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tmp = NEG32(tmp);
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if (tmp >= max_val)
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max_val = tmp;
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}
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sig_shift=0;
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while (max_val>max_scale)
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{
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sig_shift++;
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max_val >>= 1;
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}
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for (i=0;i<len;i++)
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y[i] = EXTRACT16(SHR32(x[i], sig_shift));
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return sig_shift;
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}
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#endif
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#else
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spx_word16_t compute_rms(const spx_sig_t *x, int len)
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{
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int i;
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float sum=0;
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for (i=0;i<len;i++)
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{
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sum += x[i]*x[i];
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}
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return sqrt(.1+sum/len);
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}
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spx_word16_t compute_rms16(const spx_word16_t *x, int len)
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{
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return compute_rms(x, len);
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}
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#endif
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#ifndef OVERRIDE_FILTER_MEM16
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void filter_mem16(const spx_word16_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack)
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{
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int i,j;
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spx_word16_t xi,yi,nyi;
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for (i=0;i<N;i++)
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{
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xi= x[i];
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yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767));
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nyi = NEG16(yi);
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for (j=0;j<ord-1;j++)
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{
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mem[j] = MAC16_16(MAC16_16(mem[j+1], num[j],xi), den[j],nyi);
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}
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mem[ord-1] = ADD32(MULT16_16(num[ord-1],xi), MULT16_16(den[ord-1],nyi));
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y[i] = yi;
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}
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}
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#endif
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#ifndef OVERRIDE_IIR_MEM16
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void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack)
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{
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int i,j;
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spx_word16_t yi,nyi;
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for (i=0;i<N;i++)
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{
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yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767));
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nyi = NEG16(yi);
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for (j=0;j<ord-1;j++)
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{
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mem[j] = MAC16_16(mem[j+1],den[j],nyi);
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}
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mem[ord-1] = MULT16_16(den[ord-1],nyi);
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y[i] = yi;
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}
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}
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#endif
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#ifndef OVERRIDE_FIR_MEM16
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void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack)
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{
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int i,j;
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spx_word16_t xi,yi;
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for (i=0;i<N;i++)
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{
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xi=x[i];
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yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767));
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for (j=0;j<ord-1;j++)
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{
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mem[j] = MAC16_16(mem[j+1], num[j],xi);
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}
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mem[ord-1] = MULT16_16(num[ord-1],xi);
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y[i] = yi;
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}
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}
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#endif
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void syn_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack)
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{
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int i;
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VARDECL(spx_mem_t *mem);
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ALLOC(mem, ord, spx_mem_t);
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for (i=0;i<ord;i++)
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mem[i]=0;
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iir_mem16(xx, ak, y, N, ord, mem, stack);
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for (i=0;i<ord;i++)
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mem[i]=0;
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filter_mem16(y, awk1, awk2, y, N, ord, mem, stack);
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}
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void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack)
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{
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int i;
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VARDECL(spx_mem_t *mem);
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ALLOC(mem, ord, spx_mem_t);
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for (i=0;i<ord;i++)
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mem[i]=0;
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filter_mem16(xx, ak, awk1, y, N, ord, mem, stack);
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for (i=0;i<ord;i++)
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mem[i]=0;
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fir_mem16(y, awk2, y, N, ord, mem, stack);
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}
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#ifndef OVERRIDE_COMPUTE_IMPULSE_RESPONSE
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void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack)
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{
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int i,j;
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spx_word16_t y1, ny1i, ny2i;
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VARDECL(spx_mem_t *mem1);
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VARDECL(spx_mem_t *mem2);
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ALLOC(mem1, ord, spx_mem_t);
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ALLOC(mem2, ord, spx_mem_t);
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y[0] = LPC_SCALING;
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for (i=0;i<ord;i++)
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y[i+1] = awk1[i];
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i++;
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for (;i<N;i++)
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y[i] = VERY_SMALL;
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for (i=0;i<ord;i++)
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mem1[i] = mem2[i] = 0;
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for (i=0;i<N;i++)
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{
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y1 = ADD16(y[i], EXTRACT16(PSHR32(mem1[0],LPC_SHIFT)));
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ny1i = NEG16(y1);
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y[i] = PSHR32(ADD32(SHL32(EXTEND32(y1),LPC_SHIFT+1),mem2[0]),LPC_SHIFT);
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ny2i = NEG16(y[i]);
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for (j=0;j<ord-1;j++)
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{
|
|
mem1[j] = MAC16_16(mem1[j+1], awk2[j],ny1i);
|
|
mem2[j] = MAC16_16(mem2[j+1], ak[j],ny2i);
|
|
}
|
|
mem1[ord-1] = MULT16_16(awk2[ord-1],ny1i);
|
|
mem2[ord-1] = MULT16_16(ak[ord-1],ny2i);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Decomposes a signal into low-band and high-band using a QMF */
|
|
void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_word16_t *y1, spx_word16_t *y2, int N, int M, spx_word16_t *mem, char *stack)
|
|
{
|
|
int i,j,k,M2;
|
|
VARDECL(spx_word16_t *a);
|
|
VARDECL(spx_word16_t *x);
|
|
spx_word16_t *x2;
|
|
|
|
ALLOC(a, M, spx_word16_t);
|
|
ALLOC(x, N+M-1, spx_word16_t);
|
|
x2=x+M-1;
|
|
M2=M>>1;
|
|
for (i=0;i<M;i++)
|
|
a[M-i-1]= aa[i];
|
|
for (i=0;i<M-1;i++)
|
|
x[i]=mem[M-i-2];
|
|
for (i=0;i<N;i++)
|
|
x[i+M-1]=SHR16(xx[i],1);
|
|
for (i=0;i<M-1;i++)
|
|
mem[i]=SHR16(xx[N-i-1],1);
|
|
for (i=0,k=0;i<N;i+=2,k++)
|
|
{
|
|
spx_word32_t y1k=0, y2k=0;
|
|
for (j=0;j<M2;j++)
|
|
{
|
|
y1k=ADD32(y1k,MULT16_16(a[j],ADD16(x[i+j],x2[i-j])));
|
|
y2k=SUB32(y2k,MULT16_16(a[j],SUB16(x[i+j],x2[i-j])));
|
|
j++;
|
|
y1k=ADD32(y1k,MULT16_16(a[j],ADD16(x[i+j],x2[i-j])));
|
|
y2k=ADD32(y2k,MULT16_16(a[j],SUB16(x[i+j],x2[i-j])));
|
|
}
|
|
y1[k] = EXTRACT16(SATURATE(PSHR32(y1k,15),32767));
|
|
y2[k] = EXTRACT16(SATURATE(PSHR32(y2k,15),32767));
|
|
}
|
|
}
|
|
|
|
/* Re-synthesised a signal from the QMF low-band and high-band signals */
|
|
void qmf_synth(const spx_word16_t *x1, const spx_word16_t *x2, const spx_word16_t *a, spx_word16_t *y, int N, int M, spx_word16_t *mem1, spx_word16_t *mem2, char *stack)
|
|
/* assumptions:
|
|
all odd x[i] are zero -- well, actually they are left out of the array now
|
|
N and M are multiples of 4 */
|
|
{
|
|
int i, j;
|
|
int M2, N2;
|
|
VARDECL(spx_word16_t *xx1);
|
|
VARDECL(spx_word16_t *xx2);
|
|
|
|
M2 = M>>1;
|
|
N2 = N>>1;
|
|
ALLOC(xx1, M2+N2, spx_word16_t);
|
|
ALLOC(xx2, M2+N2, spx_word16_t);
|
|
|
|
for (i = 0; i < N2; i++)
|
|
xx1[i] = x1[N2-1-i];
|
|
for (i = 0; i < M2; i++)
|
|
xx1[N2+i] = mem1[2*i+1];
|
|
for (i = 0; i < N2; i++)
|
|
xx2[i] = x2[N2-1-i];
|
|
for (i = 0; i < M2; i++)
|
|
xx2[N2+i] = mem2[2*i+1];
|
|
|
|
for (i = 0; i < N2; i += 2) {
|
|
spx_sig_t y0, y1, y2, y3;
|
|
spx_word16_t x10, x20;
|
|
|
|
y0 = y1 = y2 = y3 = 0;
|
|
x10 = xx1[N2-2-i];
|
|
x20 = xx2[N2-2-i];
|
|
|
|
for (j = 0; j < M2; j += 2) {
|
|
spx_word16_t x11, x21;
|
|
spx_word16_t a0, a1;
|
|
|
|
a0 = a[2*j];
|
|
a1 = a[2*j+1];
|
|
x11 = xx1[N2-1+j-i];
|
|
x21 = xx2[N2-1+j-i];
|
|
|
|
#ifdef FIXED_POINT
|
|
/* We multiply twice by the same coef to avoid overflows */
|
|
y0 = MAC16_16(MAC16_16(y0, a0, x11), NEG16(a0), x21);
|
|
y1 = MAC16_16(MAC16_16(y1, a1, x11), a1, x21);
|
|
y2 = MAC16_16(MAC16_16(y2, a0, x10), NEG16(a0), x20);
|
|
y3 = MAC16_16(MAC16_16(y3, a1, x10), a1, x20);
|
|
#else
|
|
y0 = ADD32(y0,MULT16_16(a0, x11-x21));
|
|
y1 = ADD32(y1,MULT16_16(a1, x11+x21));
|
|
y2 = ADD32(y2,MULT16_16(a0, x10-x20));
|
|
y3 = ADD32(y3,MULT16_16(a1, x10+x20));
|
|
#endif
|
|
a0 = a[2*j+2];
|
|
a1 = a[2*j+3];
|
|
x10 = xx1[N2+j-i];
|
|
x20 = xx2[N2+j-i];
|
|
|
|
#ifdef FIXED_POINT
|
|
/* We multiply twice by the same coef to avoid overflows */
|
|
y0 = MAC16_16(MAC16_16(y0, a0, x10), NEG16(a0), x20);
|
|
y1 = MAC16_16(MAC16_16(y1, a1, x10), a1, x20);
|
|
y2 = MAC16_16(MAC16_16(y2, a0, x11), NEG16(a0), x21);
|
|
y3 = MAC16_16(MAC16_16(y3, a1, x11), a1, x21);
|
|
#else
|
|
y0 = ADD32(y0,MULT16_16(a0, x10-x20));
|
|
y1 = ADD32(y1,MULT16_16(a1, x10+x20));
|
|
y2 = ADD32(y2,MULT16_16(a0, x11-x21));
|
|
y3 = ADD32(y3,MULT16_16(a1, x11+x21));
|
|
#endif
|
|
}
|
|
#ifdef FIXED_POINT
|
|
y[2*i] = EXTRACT16(SATURATE32(PSHR32(y0,15),32767));
|
|
y[2*i+1] = EXTRACT16(SATURATE32(PSHR32(y1,15),32767));
|
|
y[2*i+2] = EXTRACT16(SATURATE32(PSHR32(y2,15),32767));
|
|
y[2*i+3] = EXTRACT16(SATURATE32(PSHR32(y3,15),32767));
|
|
#else
|
|
/* Normalize up explicitly if we're in float */
|
|
y[2*i] = 2.f*y0;
|
|
y[2*i+1] = 2.f*y1;
|
|
y[2*i+2] = 2.f*y2;
|
|
y[2*i+3] = 2.f*y3;
|
|
#endif
|
|
}
|
|
|
|
for (i = 0; i < M2; i++)
|
|
mem1[2*i+1] = xx1[i];
|
|
for (i = 0; i < M2; i++)
|
|
mem2[2*i+1] = xx2[i];
|
|
}
|
|
|
|
#ifdef FIXED_POINT
|
|
#if 0
|
|
const spx_word16_t shift_filt[3][7] = {{-33, 1043, -4551, 19959, 19959, -4551, 1043},
|
|
{-98, 1133, -4425, 29179, 8895, -2328, 444},
|
|
{444, -2328, 8895, 29179, -4425, 1133, -98}};
|
|
#else
|
|
const spx_word16_t shift_filt[3][7] = {{-390, 1540, -4993, 20123, 20123, -4993, 1540},
|
|
{-1064, 2817, -6694, 31589, 6837, -990, -209},
|
|
{-209, -990, 6837, 31589, -6694, 2817, -1064}};
|
|
#endif
|
|
#else
|
|
#if 0
|
|
const float shift_filt[3][7] = {{-9.9369e-04, 3.1831e-02, -1.3889e-01, 6.0910e-01, 6.0910e-01, -1.3889e-01, 3.1831e-02},
|
|
{-0.0029937, 0.0345613, -0.1350474, 0.8904793, 0.2714479, -0.0710304, 0.0135403},
|
|
{0.0135403, -0.0710304, 0.2714479, 0.8904793, -0.1350474, 0.0345613, -0.0029937}};
|
|
#else
|
|
const float shift_filt[3][7] = {{-0.011915f, 0.046995f, -0.152373f, 0.614108f, 0.614108f, -0.152373f, 0.046995f},
|
|
{-0.0324855f, 0.0859768f, -0.2042986f, 0.9640297f, 0.2086420f, -0.0302054f, -0.0063646f},
|
|
{-0.0063646f, -0.0302054f, 0.2086420f, 0.9640297f, -0.2042986f, 0.0859768f, -0.0324855f}};
|
|
#endif
|
|
#endif
|
|
|
|
int interp_pitch(
|
|
spx_word16_t *exc, /*decoded excitation*/
|
|
spx_word16_t *interp, /*decoded excitation*/
|
|
int pitch, /*pitch period*/
|
|
int len
|
|
)
|
|
{
|
|
int i,j,k;
|
|
spx_word32_t corr[4][7];
|
|
spx_word32_t maxcorr;
|
|
int maxi, maxj;
|
|
for (i=0;i<7;i++)
|
|
{
|
|
corr[0][i] = inner_prod(exc, exc-pitch-3+i, len);
|
|
}
|
|
for (i=0;i<3;i++)
|
|
{
|
|
for (j=0;j<7;j++)
|
|
{
|
|
int i1, i2;
|
|
spx_word32_t tmp=0;
|
|
i1 = 3-j;
|
|
if (i1<0)
|
|
i1 = 0;
|
|
i2 = 10-j;
|
|
if (i2>7)
|
|
i2 = 7;
|
|
for (k=i1;k<i2;k++)
|
|
tmp += MULT16_32_Q15(shift_filt[i][k],corr[0][j+k-3]);
|
|
corr[i+1][j] = tmp;
|
|
}
|
|
}
|
|
maxi=maxj=0;
|
|
maxcorr = corr[0][0];
|
|
for (i=0;i<4;i++)
|
|
{
|
|
for (j=0;j<7;j++)
|
|
{
|
|
if (corr[i][j] > maxcorr)
|
|
{
|
|
maxcorr = corr[i][j];
|
|
maxi=i;
|
|
maxj=j;
|
|
}
|
|
}
|
|
}
|
|
for (i=0;i<len;i++)
|
|
{
|
|
spx_word32_t tmp = 0;
|
|
if (maxi>0)
|
|
{
|
|
for (k=0;k<7;k++)
|
|
{
|
|
tmp += MULT16_16(exc[i-(pitch-maxj+3)+k-3],shift_filt[maxi-1][k]);
|
|
}
|
|
} else {
|
|
tmp = SHL32(exc[i-(pitch-maxj+3)],15);
|
|
}
|
|
interp[i] = PSHR32(tmp,15);
|
|
}
|
|
return pitch-maxj+3;
|
|
}
|
|
|
|
void multicomb(
|
|
spx_word16_t *exc, /*decoded excitation*/
|
|
spx_word16_t *new_exc, /*enhanced excitation*/
|
|
spx_coef_t *ak, /*LPC filter coefs*/
|
|
int p, /*LPC order*/
|
|
int nsf, /*sub-frame size*/
|
|
int pitch, /*pitch period*/
|
|
int max_pitch,
|
|
spx_word16_t comb_gain, /*gain of comb filter*/
|
|
char *stack
|
|
)
|
|
{
|
|
int i;
|
|
VARDECL(spx_word16_t *iexc);
|
|
spx_word16_t old_ener, new_ener;
|
|
int corr_pitch;
|
|
|
|
spx_word16_t iexc0_mag, iexc1_mag, exc_mag;
|
|
spx_word32_t corr0, corr1;
|
|
spx_word16_t gain0, gain1;
|
|
spx_word16_t pgain1, pgain2;
|
|
spx_word16_t c1, c2;
|
|
spx_word16_t g1, g2;
|
|
spx_word16_t ngain;
|
|
spx_word16_t gg1, gg2;
|
|
#ifdef FIXED_POINT
|
|
int scaledown=0;
|
|
#endif
|
|
#if 0 /* Set to 1 to enable full pitch search */
|
|
int nol_pitch[6];
|
|
spx_word16_t nol_pitch_coef[6];
|
|
spx_word16_t ol_pitch_coef;
|
|
open_loop_nbest_pitch(exc, 20, 120, nsf,
|
|
nol_pitch, nol_pitch_coef, 6, stack);
|
|
corr_pitch=nol_pitch[0];
|
|
ol_pitch_coef = nol_pitch_coef[0];
|
|
/*Try to remove pitch multiples*/
|
|
for (i=1;i<6;i++)
|
|
{
|
|
#ifdef FIXED_POINT
|
|
if ((nol_pitch_coef[i]>MULT16_16_Q15(nol_pitch_coef[0],19661)) &&
|
|
#else
|
|
if ((nol_pitch_coef[i]>.6*nol_pitch_coef[0]) &&
|
|
#endif
|
|
(ABS(2*nol_pitch[i]-corr_pitch)<=2 || ABS(3*nol_pitch[i]-corr_pitch)<=3 ||
|
|
ABS(4*nol_pitch[i]-corr_pitch)<=4 || ABS(5*nol_pitch[i]-corr_pitch)<=5))
|
|
{
|
|
corr_pitch = nol_pitch[i];
|
|
}
|
|
}
|
|
#else
|
|
corr_pitch = pitch;
|
|
#endif
|
|
|
|
ALLOC(iexc, 2*nsf, spx_word16_t);
|
|
|
|
interp_pitch(exc, iexc, corr_pitch, 80);
|
|
if (corr_pitch>max_pitch)
|
|
interp_pitch(exc, iexc+nsf, 2*corr_pitch, 80);
|
|
else
|
|
interp_pitch(exc, iexc+nsf, -corr_pitch, 80);
|
|
|
|
#ifdef FIXED_POINT
|
|
for (i=0;i<nsf;i++)
|
|
{
|
|
if (ABS16(exc[i])>16383)
|
|
{
|
|
scaledown = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (scaledown)
|
|
{
|
|
for (i=0;i<nsf;i++)
|
|
exc[i] = SHR16(exc[i],1);
|
|
for (i=0;i<2*nsf;i++)
|
|
iexc[i] = SHR16(iexc[i],1);
|
|
}
|
|
#endif
|
|
/*interp_pitch(exc, iexc+2*nsf, 2*corr_pitch, 80);*/
|
|
|
|
/*printf ("%d %d %f\n", pitch, corr_pitch, max_corr*ener_1);*/
|
|
iexc0_mag = spx_sqrt(1000+inner_prod(iexc,iexc,nsf));
|
|
iexc1_mag = spx_sqrt(1000+inner_prod(iexc+nsf,iexc+nsf,nsf));
|
|
exc_mag = spx_sqrt(1+inner_prod(exc,exc,nsf));
|
|
corr0 = inner_prod(iexc,exc,nsf);
|
|
if (corr0<0)
|
|
corr0=0;
|
|
corr1 = inner_prod(iexc+nsf,exc,nsf);
|
|
if (corr1<0)
|
|
corr1=0;
|
|
#ifdef FIXED_POINT
|
|
/* Doesn't cost much to limit the ratio and it makes the rest easier */
|
|
if (SHL32(EXTEND32(iexc0_mag),6) < EXTEND32(exc_mag))
|
|
iexc0_mag = ADD16(1,PSHR16(exc_mag,6));
|
|
if (SHL32(EXTEND32(iexc1_mag),6) < EXTEND32(exc_mag))
|
|
iexc1_mag = ADD16(1,PSHR16(exc_mag,6));
|
|
#endif
|
|
if (corr0 > MULT16_16(iexc0_mag,exc_mag))
|
|
pgain1 = QCONST16(1., 14);
|
|
else
|
|
pgain1 = PDIV32_16(SHL32(PDIV32(corr0, exc_mag),14),iexc0_mag);
|
|
if (corr1 > MULT16_16(iexc1_mag,exc_mag))
|
|
pgain2 = QCONST16(1., 14);
|
|
else
|
|
pgain2 = PDIV32_16(SHL32(PDIV32(corr1, exc_mag),14),iexc1_mag);
|
|
gg1 = PDIV32_16(SHL32(EXTEND32(exc_mag),8), iexc0_mag);
|
|
gg2 = PDIV32_16(SHL32(EXTEND32(exc_mag),8), iexc1_mag);
|
|
if (comb_gain>0)
|
|
{
|
|
#ifdef FIXED_POINT
|
|
c1 = (MULT16_16_Q15(QCONST16(.4,15),comb_gain)+QCONST16(.07,15));
|
|
c2 = QCONST16(.5,15)+MULT16_16_Q14(QCONST16(1.72,14),(c1-QCONST16(.07,15)));
|
|
#else
|
|
c1 = .4*comb_gain+.07;
|
|
c2 = .5+1.72*(c1-.07);
|
|
#endif
|
|
} else
|
|
{
|
|
c1=c2=0;
|
|
}
|
|
#ifdef FIXED_POINT
|
|
g1 = 32767 - MULT16_16_Q13(MULT16_16_Q15(c2, pgain1),pgain1);
|
|
g2 = 32767 - MULT16_16_Q13(MULT16_16_Q15(c2, pgain2),pgain2);
|
|
#else
|
|
g1 = 1-c2*pgain1*pgain1;
|
|
g2 = 1-c2*pgain2*pgain2;
|
|
#endif
|
|
if (g1<c1)
|
|
g1 = c1;
|
|
if (g2<c1)
|
|
g2 = c1;
|
|
g1 = (spx_word16_t)PDIV32_16(SHL32(EXTEND32(c1),14),(spx_word16_t)g1);
|
|
g2 = (spx_word16_t)PDIV32_16(SHL32(EXTEND32(c1),14),(spx_word16_t)g2);
|
|
if (corr_pitch>max_pitch)
|
|
{
|
|
gain0 = MULT16_16_Q15(QCONST16(.7,15),MULT16_16_Q14(g1,gg1));
|
|
gain1 = MULT16_16_Q15(QCONST16(.3,15),MULT16_16_Q14(g2,gg2));
|
|
} else {
|
|
gain0 = MULT16_16_Q15(QCONST16(.6,15),MULT16_16_Q14(g1,gg1));
|
|
gain1 = MULT16_16_Q15(QCONST16(.6,15),MULT16_16_Q14(g2,gg2));
|
|
}
|
|
for (i=0;i<nsf;i++)
|
|
new_exc[i] = ADD16(exc[i], EXTRACT16(PSHR32(ADD32(MULT16_16(gain0,iexc[i]), MULT16_16(gain1,iexc[i+nsf])),8)));
|
|
/* FIXME: compute_rms16 is currently not quite accurate enough (but close) */
|
|
new_ener = compute_rms16(new_exc, nsf);
|
|
old_ener = compute_rms16(exc, nsf);
|
|
|
|
if (old_ener < 1)
|
|
old_ener = 1;
|
|
if (new_ener < 1)
|
|
new_ener = 1;
|
|
if (old_ener > new_ener)
|
|
old_ener = new_ener;
|
|
ngain = PDIV32_16(SHL32(EXTEND32(old_ener),14),new_ener);
|
|
|
|
for (i=0;i<nsf;i++)
|
|
new_exc[i] = MULT16_16_Q14(ngain, new_exc[i]);
|
|
#ifdef FIXED_POINT
|
|
if (scaledown)
|
|
{
|
|
for (i=0;i<nsf;i++)
|
|
exc[i] = SHL16(exc[i],1);
|
|
for (i=0;i<nsf;i++)
|
|
new_exc[i] = SHL16(SATURATE16(new_exc[i],16383),1);
|
|
}
|
|
#endif
|
|
}
|
|
|