| /* Copyright (C) 2002-2006 Jean-Marc Valin |
| File: filters.c |
| Various analysis/synthesis filters |
| |
| 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. |
| |
| - Neither the name of the Xiph.org Foundation nor the names of its |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| 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 FOUNDATION 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 "filters.h" |
| #include "stack_alloc.h" |
| #include "arch.h" |
| #include "math_approx.h" |
| #include "ltp.h" |
| #include <math.h> |
| |
| #ifdef _USE_SSE |
| #include "filters_sse.h" |
| #elif defined (ARM4_ASM) || defined(ARM5E_ASM) |
| #include "filters_arm4.h" |
| #elif defined (BFIN_ASM) |
| #include "filters_bfin.h" |
| #endif |
| |
| |
| |
| void bw_lpc(spx_word16_t gamma, const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order) |
| { |
| int i; |
| spx_word16_t tmp=gamma; |
| for (i=0;i<order;i++) |
| { |
| lpc_out[i] = MULT16_16_P15(tmp,lpc_in[i]); |
| tmp = MULT16_16_P15(tmp, gamma); |
| } |
| } |
| |
| void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len) |
| { |
| int i; |
| for (i=0;i<len;i++) |
| { |
| /* It's important we do the test that way so we can catch NaNs, which are neither greater nor smaller */ |
| if (!(vec[i]>=min_val && vec[i] <= max_val)) |
| { |
| if (vec[i] < min_val) |
| vec[i] = min_val; |
| else if (vec[i] > max_val) |
| vec[i] = max_val; |
| else /* Has to be NaN */ |
| vec[i] = 0; |
| } |
| } |
| } |
| |
| void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem) |
| { |
| int i; |
| #ifdef FIXED_POINT |
| const spx_word16_t Pcoef[5][3] = {{16384, -31313, 14991}, {16384, -31569, 15249}, {16384, -31677, 15328}, {16384, -32313, 15947}, {16384, -22446, 6537}}; |
| const spx_word16_t Zcoef[5][3] = {{15672, -31344, 15672}, {15802, -31601, 15802}, {15847, -31694, 15847}, {16162, -32322, 16162}, {14418, -28836, 14418}}; |
| #else |
| 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}}; |
| 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}}; |
| #endif |
| const spx_word16_t *den, *num; |
| if (filtID>4) |
| filtID=4; |
| |
| den = Pcoef[filtID]; num = Zcoef[filtID]; |
| /*return;*/ |
| for (i=0;i<len;i++) |
| { |
| spx_word16_t yi; |
| spx_word32_t vout = ADD32(MULT16_16(num[0], x[i]),mem[0]); |
| yi = EXTRACT16(SATURATE(PSHR32(vout,14),32767)); |
| mem[0] = ADD32(MAC16_16(mem[1], num[1],x[i]), SHL32(MULT16_32_Q15(-den[1],vout),1)); |
| mem[1] = ADD32(MULT16_16(num[2],x[i]), SHL32(MULT16_32_Q15(-den[2],vout),1)); |
| y[i] = yi; |
| } |
| } |
| |
| #ifdef FIXED_POINT |
| |
| /* FIXME: These functions are ugly and probably introduce too much error */ |
| void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len) |
| { |
| int i; |
| for (i=0;i<len;i++) |
| { |
| y[i] = SHL32(MULT16_32_Q14(EXTRACT16(SHR32(x[i],7)),scale),7); |
| } |
| } |
| |
| void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len) |
| { |
| int i; |
| if (scale > SHL32(EXTEND32(SIG_SCALING), 8)) |
| { |
| spx_word16_t scale_1; |
| scale = PSHR32(scale, SIG_SHIFT); |
| scale_1 = EXTRACT16(PDIV32_16(SHL32(EXTEND32(SIG_SCALING),7),scale)); |
| for (i=0;i<len;i++) |
| { |
| y[i] = MULT16_16_P15(scale_1, x[i]); |
| } |
| } else if (scale > SHR32(EXTEND32(SIG_SCALING), 2)) { |
| spx_word16_t scale_1; |
| scale = PSHR32(scale, SIG_SHIFT-5); |
| scale_1 = DIV32_16(SHL32(EXTEND32(SIG_SCALING),3),scale); |
| for (i=0;i<len;i++) |
| { |
| y[i] = PSHR32(MULT16_16(scale_1, SHL16(x[i],2)),8); |
| } |
| } else { |
| spx_word16_t scale_1; |
| scale = PSHR32(scale, SIG_SHIFT-7); |
| if (scale < 5) |
| scale = 5; |
| scale_1 = DIV32_16(SHL32(EXTEND32(SIG_SCALING),3),scale); |
| for (i=0;i<len;i++) |
| { |
| y[i] = PSHR32(MULT16_16(scale_1, SHL16(x[i],2)),6); |
| } |
| } |
| } |
| |
| #else |
| |
| void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len) |
| { |
| int i; |
| for (i=0;i<len;i++) |
| y[i] = scale*x[i]; |
| } |
| |
| void signal_div(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len) |
| { |
| int i; |
| float scale_1 = 1/scale; |
| for (i=0;i<len;i++) |
| y[i] = scale_1*x[i]; |
| } |
| #endif |
| |
| |
| |
| #ifdef FIXED_POINT |
| |
| |
| |
| spx_word16_t compute_rms(const spx_sig_t *x, int len) |
| { |
| int i; |
| spx_word32_t sum=0; |
| spx_sig_t max_val=1; |
| int sig_shift; |
| |
| for (i=0;i<len;i++) |
| { |
| spx_sig_t tmp = x[i]; |
| if (tmp<0) |
| tmp = -tmp; |
| if (tmp > max_val) |
| max_val = tmp; |
| } |
| |
| sig_shift=0; |
| while (max_val>16383) |
| { |
| sig_shift++; |
| max_val >>= 1; |
| } |
| |
| for (i=0;i<len;i+=4) |
| { |
| spx_word32_t sum2=0; |
| spx_word16_t tmp; |
| tmp = EXTRACT16(SHR32(x[i],sig_shift)); |
| sum2 = MAC16_16(sum2,tmp,tmp); |
| tmp = EXTRACT16(SHR32(x[i+1],sig_shift)); |
| sum2 = MAC16_16(sum2,tmp,tmp); |
| tmp = EXTRACT16(SHR32(x[i+2],sig_shift)); |
| sum2 = MAC16_16(sum2,tmp,tmp); |
| tmp = EXTRACT16(SHR32(x[i+3],sig_shift)); |
| sum2 = MAC16_16(sum2,tmp,tmp); |
| sum = ADD32(sum,SHR32(sum2,6)); |
| } |
| |
| return EXTRACT16(PSHR32(SHL32(EXTEND32(spx_sqrt(DIV32(sum,len))),(sig_shift+3)),SIG_SHIFT)); |
| } |
| |
| spx_word16_t compute_rms16(const spx_word16_t *x, int len) |
| { |
| int i; |
| spx_word16_t max_val=10; |
| |
| for (i=0;i<len;i++) |
| { |
| spx_sig_t tmp = x[i]; |
| if (tmp<0) |
| tmp = -tmp; |
| if (tmp > max_val) |
| max_val = tmp; |
| } |
| if (max_val>16383) |
| { |
| spx_word32_t sum=0; |
| for (i=0;i<len;i+=4) |
| { |
| spx_word32_t sum2=0; |
| sum2 = MAC16_16(sum2,SHR16(x[i],1),SHR16(x[i],1)); |
| sum2 = MAC16_16(sum2,SHR16(x[i+1],1),SHR16(x[i+1],1)); |
| sum2 = MAC16_16(sum2,SHR16(x[i+2],1),SHR16(x[i+2],1)); |
| sum2 = MAC16_16(sum2,SHR16(x[i+3],1),SHR16(x[i+3],1)); |
| sum = ADD32(sum,SHR32(sum2,6)); |
| } |
| return SHL16(spx_sqrt(DIV32(sum,len)),4); |
| } else { |
| spx_word32_t sum=0; |
| int sig_shift=0; |
| if (max_val < 8192) |
| sig_shift=1; |
| if (max_val < 4096) |
| sig_shift=2; |
| if (max_val < 2048) |
| sig_shift=3; |
| for (i=0;i<len;i+=4) |
| { |
| spx_word32_t sum2=0; |
| sum2 = MAC16_16(sum2,SHL16(x[i],sig_shift),SHL16(x[i],sig_shift)); |
| sum2 = MAC16_16(sum2,SHL16(x[i+1],sig_shift),SHL16(x[i+1],sig_shift)); |
| sum2 = MAC16_16(sum2,SHL16(x[i+2],sig_shift),SHL16(x[i+2],sig_shift)); |
| sum2 = MAC16_16(sum2,SHL16(x[i+3],sig_shift),SHL16(x[i+3],sig_shift)); |
| sum = ADD32(sum,SHR32(sum2,6)); |
| } |
| return SHL16(spx_sqrt(DIV32(sum,len)),3-sig_shift); |
| } |
| } |
| |
| #ifndef OVERRIDE_NORMALIZE16 |
| int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len) |
| { |
| int i; |
| spx_sig_t max_val=1; |
| int sig_shift; |
| |
| for (i=0;i<len;i++) |
| { |
| spx_sig_t tmp = x[i]; |
| if (tmp<0) |
| tmp = NEG32(tmp); |
| if (tmp >= max_val) |
| max_val = tmp; |
| } |
| |
| sig_shift=0; |
| while (max_val>max_scale) |
| { |
| sig_shift++; |
| max_val >>= 1; |
| } |
| |
| for (i=0;i<len;i++) |
| y[i] = EXTRACT16(SHR32(x[i], sig_shift)); |
| |
| return sig_shift; |
| } |
| #endif |
| |
| #else |
| |
| spx_word16_t compute_rms(const spx_sig_t *x, int len) |
| { |
| int i; |
| float sum=0; |
| for (i=0;i<len;i++) |
| { |
| sum += x[i]*x[i]; |
| } |
| return sqrt(.1+sum/len); |
| } |
| spx_word16_t compute_rms16(const spx_word16_t *x, int len) |
| { |
| return compute_rms(x, len); |
| } |
| #endif |
| |
| |
| |
| #ifndef OVERRIDE_FILTER_MEM16 |
| 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) |
| { |
| int i,j; |
| spx_word16_t xi,yi,nyi; |
| for (i=0;i<N;i++) |
| { |
| xi= x[i]; |
| yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767)); |
| nyi = NEG16(yi); |
| for (j=0;j<ord-1;j++) |
| { |
| mem[j] = MAC16_16(MAC16_16(mem[j+1], num[j],xi), den[j],nyi); |
| } |
| mem[ord-1] = ADD32(MULT16_16(num[ord-1],xi), MULT16_16(den[ord-1],nyi)); |
| y[i] = yi; |
| } |
| } |
| #endif |
| |
| #ifndef OVERRIDE_IIR_MEM16 |
| 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) |
| { |
| int i,j; |
| spx_word16_t yi,nyi; |
| |
| for (i=0;i<N;i++) |
| { |
| yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767)); |
| nyi = NEG16(yi); |
| for (j=0;j<ord-1;j++) |
| { |
| mem[j] = MAC16_16(mem[j+1],den[j],nyi); |
| } |
| mem[ord-1] = MULT16_16(den[ord-1],nyi); |
| y[i] = yi; |
| } |
| } |
| #endif |
| |
| #ifndef OVERRIDE_FIR_MEM16 |
| 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) |
| { |
| int i,j; |
| spx_word16_t xi,yi; |
| |
| for (i=0;i<N;i++) |
| { |
| xi=x[i]; |
| yi = EXTRACT16(SATURATE(ADD32(EXTEND32(x[i]),PSHR32(mem[0],LPC_SHIFT)),32767)); |
| for (j=0;j<ord-1;j++) |
| { |
| mem[j] = MAC16_16(mem[j+1], num[j],xi); |
| } |
| mem[ord-1] = MULT16_16(num[ord-1],xi); |
| y[i] = yi; |
| } |
| } |
| #endif |
| |
| |
| 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) |
| { |
| int i; |
| VARDECL(spx_mem_t *mem); |
| ALLOC(mem, ord, spx_mem_t); |
| for (i=0;i<ord;i++) |
| mem[i]=0; |
| iir_mem16(xx, ak, y, N, ord, mem, stack); |
| for (i=0;i<ord;i++) |
| mem[i]=0; |
| filter_mem16(y, awk1, awk2, y, N, ord, mem, stack); |
| } |
| 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) |
| { |
| int i; |
| VARDECL(spx_mem_t *mem); |
| ALLOC(mem, ord, spx_mem_t); |
| for (i=0;i<ord;i++) |
| mem[i]=0; |
| filter_mem16(xx, ak, awk1, y, N, ord, mem, stack); |
| for (i=0;i<ord;i++) |
| mem[i]=0; |
| fir_mem16(y, awk2, y, N, ord, mem, stack); |
| } |
| |
| |
| #ifndef OVERRIDE_COMPUTE_IMPULSE_RESPONSE |
| 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) |
| { |
| int i,j; |
| spx_word16_t y1, ny1i, ny2i; |
| VARDECL(spx_mem_t *mem1); |
| VARDECL(spx_mem_t *mem2); |
| ALLOC(mem1, ord, spx_mem_t); |
| ALLOC(mem2, ord, spx_mem_t); |
| |
| y[0] = LPC_SCALING; |
| for (i=0;i<ord;i++) |
| y[i+1] = awk1[i]; |
| i++; |
| for (;i<N;i++) |
| y[i] = VERY_SMALL; |
| for (i=0;i<ord;i++) |
| mem1[i] = mem2[i] = 0; |
| for (i=0;i<N;i++) |
| { |
| y1 = ADD16(y[i], EXTRACT16(PSHR32(mem1[0],LPC_SHIFT))); |
| ny1i = NEG16(y1); |
| y[i] = PSHR32(ADD32(SHL32(EXTEND32(y1),LPC_SHIFT+1),mem2[0]),LPC_SHIFT); |
| ny2i = NEG16(y[i]); |
| for (j=0;j<ord-1;j++) |
| { |
| 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 |
| } |
| |