| /* Copyright (C) 2002-2006 Jean-Marc Valin |
| File: ltp.c |
| Long-Term Prediction functions |
| |
| 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 <math.h> |
| #include "ltp.h" |
| #include "stack_alloc.h" |
| #include "filters.h" |
| #include <speex/speex_bits.h> |
| #include "math_approx.h" |
| #include "os_support.h" |
| |
| #ifndef NULL |
| #define NULL 0 |
| #endif |
| |
| |
| #ifdef _USE_SSE |
| #include "ltp_sse.h" |
| #elif defined (ARM4_ASM) || defined(ARM5E_ASM) |
| #include "ltp_arm4.h" |
| #elif defined (BFIN_ASM) |
| #include "ltp_bfin.h" |
| #endif |
| |
| #ifndef OVERRIDE_INNER_PROD |
| spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len) |
| { |
| spx_word32_t sum=0; |
| len >>= 2; |
| while(len--) |
| { |
| spx_word32_t part=0; |
| part = MAC16_16(part,*x++,*y++); |
| part = MAC16_16(part,*x++,*y++); |
| part = MAC16_16(part,*x++,*y++); |
| part = MAC16_16(part,*x++,*y++); |
| /* HINT: If you had a 40-bit accumulator, you could shift only at the end */ |
| sum = ADD32(sum,SHR32(part,6)); |
| } |
| return sum; |
| } |
| #endif |
| |
| #ifndef OVERRIDE_PITCH_XCORR |
| #if 0 /* HINT: Enable this for machines with enough registers (i.e. not x86) */ |
| void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack) |
| { |
| int i,j; |
| for (i=0;i<nb_pitch;i+=4) |
| { |
| /* Compute correlation*/ |
| /*corr[nb_pitch-1-i]=inner_prod(x, _y+i, len);*/ |
| spx_word32_t sum1=0; |
| spx_word32_t sum2=0; |
| spx_word32_t sum3=0; |
| spx_word32_t sum4=0; |
| const spx_word16_t *y = _y+i; |
| const spx_word16_t *x = _x; |
| spx_word16_t y0, y1, y2, y3; |
| /*y0=y[0];y1=y[1];y2=y[2];y3=y[3];*/ |
| y0=*y++; |
| y1=*y++; |
| y2=*y++; |
| y3=*y++; |
| for (j=0;j<len;j+=4) |
| { |
| spx_word32_t part1; |
| spx_word32_t part2; |
| spx_word32_t part3; |
| spx_word32_t part4; |
| part1 = MULT16_16(*x,y0); |
| part2 = MULT16_16(*x,y1); |
| part3 = MULT16_16(*x,y2); |
| part4 = MULT16_16(*x,y3); |
| x++; |
| y0=*y++; |
| part1 = MAC16_16(part1,*x,y1); |
| part2 = MAC16_16(part2,*x,y2); |
| part3 = MAC16_16(part3,*x,y3); |
| part4 = MAC16_16(part4,*x,y0); |
| x++; |
| y1=*y++; |
| part1 = MAC16_16(part1,*x,y2); |
| part2 = MAC16_16(part2,*x,y3); |
| part3 = MAC16_16(part3,*x,y0); |
| part4 = MAC16_16(part4,*x,y1); |
| x++; |
| y2=*y++; |
| part1 = MAC16_16(part1,*x,y3); |
| part2 = MAC16_16(part2,*x,y0); |
| part3 = MAC16_16(part3,*x,y1); |
| part4 = MAC16_16(part4,*x,y2); |
| x++; |
| y3=*y++; |
| |
| sum1 = ADD32(sum1,SHR32(part1,6)); |
| sum2 = ADD32(sum2,SHR32(part2,6)); |
| sum3 = ADD32(sum3,SHR32(part3,6)); |
| sum4 = ADD32(sum4,SHR32(part4,6)); |
| } |
| corr[nb_pitch-1-i]=sum1; |
| corr[nb_pitch-2-i]=sum2; |
| corr[nb_pitch-3-i]=sum3; |
| corr[nb_pitch-4-i]=sum4; |
| } |
| |
| } |
| #else |
| void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack) |
| { |
| int i; |
| for (i=0;i<nb_pitch;i++) |
| { |
| /* Compute correlation*/ |
| corr[nb_pitch-1-i]=inner_prod(_x, _y+i, len); |
| } |
| |
| } |
| #endif |
| #endif |
| |
| #ifndef OVERRIDE_COMPUTE_PITCH_ERROR |
| static inline spx_word32_t compute_pitch_error(spx_word16_t *C, spx_word16_t *g, spx_word16_t pitch_control) |
| { |
| spx_word32_t sum = 0; |
| sum = ADD32(sum,MULT16_16(MULT16_16_16(g[0],pitch_control),C[0])); |
| sum = ADD32(sum,MULT16_16(MULT16_16_16(g[1],pitch_control),C[1])); |
| sum = ADD32(sum,MULT16_16(MULT16_16_16(g[2],pitch_control),C[2])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[0],g[1]),C[3])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[1]),C[4])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[0]),C[5])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[0],g[0]),C[6])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[1],g[1]),C[7])); |
| sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[2]),C[8])); |
| return sum; |
| } |
| #endif |
| |
| #ifndef OVERRIDE_OPEN_LOOP_NBEST_PITCH |
| void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack) |
| { |
| int i,j,k; |
| VARDECL(spx_word32_t *best_score); |
| VARDECL(spx_word32_t *best_ener); |
| spx_word32_t e0; |
| VARDECL(spx_word32_t *corr); |
| #ifdef FIXED_POINT |
| /* In fixed-point, we need only one (temporary) array of 32-bit values and two (corr16, ener16) |
| arrays for (normalized) 16-bit values */ |
| VARDECL(spx_word16_t *corr16); |
| VARDECL(spx_word16_t *ener16); |
| spx_word32_t *energy; |
| int cshift=0, eshift=0; |
| int scaledown = 0; |
| ALLOC(corr16, end-start+1, spx_word16_t); |
| ALLOC(ener16, end-start+1, spx_word16_t); |
| ALLOC(corr, end-start+1, spx_word32_t); |
| energy = corr; |
| #else |
| /* In floating-point, we need to float arrays and no normalized copies */ |
| VARDECL(spx_word32_t *energy); |
| spx_word16_t *corr16; |
| spx_word16_t *ener16; |
| ALLOC(energy, end-start+2, spx_word32_t); |
| ALLOC(corr, end-start+1, spx_word32_t); |
| corr16 = corr; |
| ener16 = energy; |
| #endif |
| |
| ALLOC(best_score, N, spx_word32_t); |
| ALLOC(best_ener, N, spx_word32_t); |
| for (i=0;i<N;i++) |
| { |
| best_score[i]=-1; |
| best_ener[i]=0; |
| pitch[i]=start; |
| } |
| |
| #ifdef FIXED_POINT |
| for (i=-end;i<len;i++) |
| { |
| if (ABS16(sw[i])>16383) |
| { |
| scaledown=1; |
| break; |
| } |
| } |
| /* If the weighted input is close to saturation, then we scale it down */ |
| if (scaledown) |
| { |
| for (i=-end;i<len;i++) |
| { |
| sw[i]=SHR16(sw[i],1); |
| } |
| } |
| #endif |
| energy[0]=inner_prod(sw-start, sw-start, len); |
| e0=inner_prod(sw, sw, len); |
| for (i=start;i<end;i++) |
| { |
| /* Update energy for next pitch*/ |
| energy[i-start+1] = SUB32(ADD32(energy[i-start],SHR32(MULT16_16(sw[-i-1],sw[-i-1]),6)), SHR32(MULT16_16(sw[-i+len-1],sw[-i+len-1]),6)); |
| if (energy[i-start+1] < 0) |
| energy[i-start+1] = 0; |
| } |
| |
| #ifdef FIXED_POINT |
| eshift = normalize16(energy, ener16, 32766, end-start+1); |
| #endif |
| |
| /* In fixed-point, this actually overrites the energy array (aliased to corr) */ |
| pitch_xcorr(sw, sw-end, corr, len, end-start+1, stack); |
| |
| #ifdef FIXED_POINT |
| /* Normalize to 180 so we can square it and it still fits in 16 bits */ |
| cshift = normalize16(corr, corr16, 180, end-start+1); |
| /* If we scaled weighted input down, we need to scale it up again (OK, so we've just lost the LSB, who cares?) */ |
| if (scaledown) |
| { |
| for (i=-end;i<len;i++) |
| { |
| sw[i]=SHL16(sw[i],1); |
| } |
| } |
| #endif |
| |
| /* Search for the best pitch prediction gain */ |
| for (i=start;i<=end;i++) |
| { |
| spx_word16_t tmp = MULT16_16_16(corr16[i-start],corr16[i-start]); |
| /* Instead of dividing the tmp by the energy, we multiply on the other side */ |
| if (MULT16_16(tmp,best_ener[N-1])>MULT16_16(best_score[N-1],ADD16(1,ener16[i-start]))) |
| { |
| /* We can safely put it last and then check */ |
| best_score[N-1]=tmp; |
| best_ener[N-1]=ener16[i-start]+1; |
| pitch[N-1]=i; |
| /* Check if it comes in front of others */ |
| for (j=0;j<N-1;j++) |
| { |
| if (MULT16_16(tmp,best_ener[j])>MULT16_16(best_score[j],ADD16(1,ener16[i-start]))) |
| { |
| for (k=N-1;k>j;k--) |
| { |
| best_score[k]=best_score[k-1]; |
| best_ener[k]=best_ener[k-1]; |
| pitch[k]=pitch[k-1]; |
| } |
| best_score[j]=tmp; |
| best_ener[j]=ener16[i-start]+1; |
| pitch[j]=i; |
| break; |
| } |
| } |
| } |
| } |
| |
| /* Compute open-loop gain if necessary */ |
| if (gain) |
| { |
| for (j=0;j<N;j++) |
| { |
| spx_word16_t g; |
| i=pitch[j]; |
| g = DIV32(SHL32(EXTEND32(corr16[i-start]),cshift), 10+SHR32(MULT16_16(spx_sqrt(e0),spx_sqrt(SHL32(EXTEND32(ener16[i-start]),eshift))),6)); |
| /* FIXME: g = max(g,corr/energy) */ |
| if (g<0) |
| g = 0; |
| gain[j]=g; |
| } |
| } |
| |
| |
| } |
| #endif |
| |
| #ifndef OVERRIDE_PITCH_GAIN_SEARCH_3TAP_VQ |
| static int pitch_gain_search_3tap_vq( |
| const signed char *gain_cdbk, |
| int gain_cdbk_size, |
| spx_word16_t *C16, |
| spx_word16_t max_gain |
| ) |
| { |
| const signed char *ptr=gain_cdbk; |
| int best_cdbk=0; |
| spx_word32_t best_sum=-VERY_LARGE32; |
| spx_word32_t sum=0; |
| spx_word16_t g[3]; |
| spx_word16_t pitch_control=64; |
| spx_word16_t gain_sum; |
| int i; |
| |
| for (i=0;i<gain_cdbk_size;i++) { |
| |
| ptr = gain_cdbk+4*i; |
| g[0]=ADD16((spx_word16_t)ptr[0],32); |
| g[1]=ADD16((spx_word16_t)ptr[1],32); |
| g[2]=ADD16((spx_word16_t)ptr[2],32); |
| gain_sum = (spx_word16_t)ptr[3]; |
| |
| sum = compute_pitch_error(C16, g, pitch_control); |
| |
| if (sum>best_sum && gain_sum<=max_gain) { |
| best_sum=sum; |
| best_cdbk=i; |
| } |
| } |
| |
| return best_cdbk; |
| } |
| #endif |
| |
| /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
| static spx_word32_t pitch_gain_search_3tap( |
| const spx_word16_t target[], /* Target vector */ |
| const spx_coef_t ak[], /* LPCs for this subframe */ |
| const spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| const spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| spx_sig_t exc[], /* Excitation */ |
| const signed char *gain_cdbk, |
| int gain_cdbk_size, |
| int pitch, /* Pitch value */ |
| int p, /* Number of LPC coeffs */ |
| int nsf, /* Number of samples in subframe */ |
| SpeexBits *bits, |
| char *stack, |
| const spx_word16_t *exc2, |
| const spx_word16_t *r, |
| spx_word16_t *new_target, |
| int *cdbk_index, |
| int plc_tuning, |
| spx_word32_t cumul_gain, |
| int scaledown |
| ) |
| { |
| int i,j; |
| VARDECL(spx_word16_t *tmp1); |
| VARDECL(spx_word16_t *e); |
| spx_word16_t *x[3]; |
| spx_word32_t corr[3]; |
| spx_word32_t A[3][3]; |
| spx_word16_t gain[3]; |
| spx_word32_t err; |
| spx_word16_t max_gain=128; |
| int best_cdbk=0; |
| |
| ALLOC(tmp1, 3*nsf, spx_word16_t); |
| ALLOC(e, nsf, spx_word16_t); |
| |
| if (cumul_gain > 262144) |
| max_gain = 31; |
| |
| x[0]=tmp1; |
| x[1]=tmp1+nsf; |
| x[2]=tmp1+2*nsf; |
| |
| for (j=0;j<nsf;j++) |
| new_target[j] = target[j]; |
| |
| { |
| VARDECL(spx_mem_t *mm); |
| int pp=pitch-1; |
| ALLOC(mm, p, spx_mem_t); |
| for (j=0;j<nsf;j++) |
| { |
| if (j-pp<0) |
| e[j]=exc2[j-pp]; |
| else if (j-pp-pitch<0) |
| e[j]=exc2[j-pp-pitch]; |
| else |
| e[j]=0; |
| } |
| #ifdef FIXED_POINT |
| /* Scale target and excitation down if needed (avoiding overflow) */ |
| if (scaledown) |
| { |
| for (j=0;j<nsf;j++) |
| e[j] = SHR16(e[j],1); |
| for (j=0;j<nsf;j++) |
| new_target[j] = SHR16(new_target[j],1); |
| } |
| #endif |
| for (j=0;j<p;j++) |
| mm[j] = 0; |
| iir_mem16(e, ak, e, nsf, p, mm, stack); |
| for (j=0;j<p;j++) |
| mm[j] = 0; |
| filter_mem16(e, awk1, awk2, e, nsf, p, mm, stack); |
| for (j=0;j<nsf;j++) |
| x[2][j] = e[j]; |
| } |
| for (i=1;i>=0;i--) |
| { |
| spx_word16_t e0=exc2[-pitch-1+i]; |
| #ifdef FIXED_POINT |
| /* Scale excitation down if needed (avoiding overflow) */ |
| if (scaledown) |
| e0 = SHR16(e0,1); |
| #endif |
| x[i][0]=MULT16_16_Q14(r[0], e0); |
| for (j=0;j<nsf-1;j++) |
| x[i][j+1]=ADD32(x[i+1][j],MULT16_16_P14(r[j+1], e0)); |
| } |
| |
| for (i=0;i<3;i++) |
| corr[i]=inner_prod(x[i],new_target,nsf); |
| for (i=0;i<3;i++) |
| for (j=0;j<=i;j++) |
| A[i][j]=A[j][i]=inner_prod(x[i],x[j],nsf); |
| |
| { |
| spx_word32_t C[9]; |
| #ifdef FIXED_POINT |
| spx_word16_t C16[9]; |
| #else |
| spx_word16_t *C16=C; |
| #endif |
| C[0]=corr[2]; |
| C[1]=corr[1]; |
| C[2]=corr[0]; |
| C[3]=A[1][2]; |
| C[4]=A[0][1]; |
| C[5]=A[0][2]; |
| C[6]=A[2][2]; |
| C[7]=A[1][1]; |
| C[8]=A[0][0]; |
| |
| /*plc_tuning *= 2;*/ |
| if (plc_tuning<2) |
| plc_tuning=2; |
| if (plc_tuning>30) |
| plc_tuning=30; |
| #ifdef FIXED_POINT |
| C[0] = SHL32(C[0],1); |
| C[1] = SHL32(C[1],1); |
| C[2] = SHL32(C[2],1); |
| C[3] = SHL32(C[3],1); |
| C[4] = SHL32(C[4],1); |
| C[5] = SHL32(C[5],1); |
| C[6] = MAC16_32_Q15(C[6],MULT16_16_16(plc_tuning,655),C[6]); |
| C[7] = MAC16_32_Q15(C[7],MULT16_16_16(plc_tuning,655),C[7]); |
| C[8] = MAC16_32_Q15(C[8],MULT16_16_16(plc_tuning,655),C[8]); |
| normalize16(C, C16, 32767, 9); |
| #else |
| C[6]*=.5*(1+.02*plc_tuning); |
| C[7]*=.5*(1+.02*plc_tuning); |
| C[8]*=.5*(1+.02*plc_tuning); |
| #endif |
| |
| best_cdbk = pitch_gain_search_3tap_vq(gain_cdbk, gain_cdbk_size, C16, max_gain); |
| |
| #ifdef FIXED_POINT |
| gain[0] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4]); |
| gain[1] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4+1]); |
| gain[2] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4+2]); |
| /*printf ("%d %d %d %d\n",gain[0],gain[1],gain[2], best_cdbk);*/ |
| #else |
| gain[0] = 0.015625*gain_cdbk[best_cdbk*4] + .5; |
| gain[1] = 0.015625*gain_cdbk[best_cdbk*4+1]+ .5; |
| gain[2] = 0.015625*gain_cdbk[best_cdbk*4+2]+ .5; |
| #endif |
| *cdbk_index=best_cdbk; |
| } |
| |
| SPEEX_MEMSET(exc, 0, nsf); |
| for (i=0;i<3;i++) |
| { |
| int j; |
| int tmp1, tmp3; |
| int pp=pitch+1-i; |
| tmp1=nsf; |
| if (tmp1>pp) |
| tmp1=pp; |
| for (j=0;j<tmp1;j++) |
| exc[j]=MAC16_16(exc[j],SHL16(gain[2-i],7),exc2[j-pp]); |
| tmp3=nsf; |
| if (tmp3>pp+pitch) |
| tmp3=pp+pitch; |
| for (j=tmp1;j<tmp3;j++) |
| exc[j]=MAC16_16(exc[j],SHL16(gain[2-i],7),exc2[j-pp-pitch]); |
| } |
| for (i=0;i<nsf;i++) |
| { |
| spx_word32_t tmp = ADD32(ADD32(MULT16_16(gain[0],x[2][i]),MULT16_16(gain[1],x[1][i])), |
| MULT16_16(gain[2],x[0][i])); |
| new_target[i] = SUB16(new_target[i], EXTRACT16(PSHR32(tmp,6))); |
| } |
| err = inner_prod(new_target, new_target, nsf); |
| |
| return err; |
| } |
| |
| /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
| int pitch_search_3tap( |
| spx_word16_t target[], /* Target vector */ |
| spx_word16_t *sw, |
| spx_coef_t ak[], /* LPCs for this subframe */ |
| spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| spx_sig_t exc[], /* Excitation */ |
| const void *par, |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| int p, /* Number of LPC coeffs */ |
| int nsf, /* Number of samples in subframe */ |
| SpeexBits *bits, |
| char *stack, |
| spx_word16_t *exc2, |
| spx_word16_t *r, |
| int complexity, |
| int cdbk_offset, |
| int plc_tuning, |
| spx_word32_t *cumul_gain |
| ) |
| { |
| int i; |
| int cdbk_index, pitch=0, best_gain_index=0; |
| VARDECL(spx_sig_t *best_exc); |
| VARDECL(spx_word16_t *new_target); |
| VARDECL(spx_word16_t *best_target); |
| int best_pitch=0; |
| spx_word32_t err, best_err=-1; |
| int N; |
| const ltp_params *params; |
| const signed char *gain_cdbk; |
| int gain_cdbk_size; |
| int scaledown=0; |
| |
| VARDECL(int *nbest); |
| |
| params = (const ltp_params*) par; |
| gain_cdbk_size = 1<<params->gain_bits; |
| gain_cdbk = params->gain_cdbk + 4*gain_cdbk_size*cdbk_offset; |
| |
| N=complexity; |
| if (N>10) |
| N=10; |
| if (N<1) |
| N=1; |
| |
| ALLOC(nbest, N, int); |
| params = (const ltp_params*) par; |
| |
| if (end<start) |
| { |
| speex_bits_pack(bits, 0, params->pitch_bits); |
| speex_bits_pack(bits, 0, params->gain_bits); |
| SPEEX_MEMSET(exc, 0, nsf); |
| return start; |
| } |
| |
| #ifdef FIXED_POINT |
| /* Check if we need to scale everything down in the pitch search to avoid overflows */ |
| for (i=0;i<nsf;i++) |
| { |
| if (ABS16(target[i])>16383) |
| { |
| scaledown=1; |
| break; |
| } |
| } |
| for (i=-end;i<nsf;i++) |
| { |
| if (ABS16(exc2[i])>16383) |
| { |
| scaledown=1; |
| break; |
| } |
| } |
| #endif |
| if (N>end-start+1) |
| N=end-start+1; |
| if (end != start) |
| open_loop_nbest_pitch(sw, start, end, nsf, nbest, NULL, N, stack); |
| else |
| nbest[0] = start; |
| |
| ALLOC(best_exc, nsf, spx_sig_t); |
| ALLOC(new_target, nsf, spx_word16_t); |
| ALLOC(best_target, nsf, spx_word16_t); |
| |
| for (i=0;i<N;i++) |
| { |
| pitch=nbest[i]; |
| SPEEX_MEMSET(exc, 0, nsf); |
| err=pitch_gain_search_3tap(target, ak, awk1, awk2, exc, gain_cdbk, gain_cdbk_size, pitch, p, nsf, |
| bits, stack, exc2, r, new_target, &cdbk_index, plc_tuning, *cumul_gain, scaledown); |
| if (err<best_err || best_err<0) |
| { |
| SPEEX_COPY(best_exc, exc, nsf); |
| SPEEX_COPY(best_target, new_target, nsf); |
| best_err=err; |
| best_pitch=pitch; |
| best_gain_index=cdbk_index; |
| } |
| } |
| /*printf ("pitch: %d %d\n", best_pitch, best_gain_index);*/ |
| speex_bits_pack(bits, best_pitch-start, params->pitch_bits); |
| speex_bits_pack(bits, best_gain_index, params->gain_bits); |
| #ifdef FIXED_POINT |
| *cumul_gain = MULT16_32_Q13(SHL16(params->gain_cdbk[4*best_gain_index+3],8), MAX32(1024,*cumul_gain)); |
| #else |
| *cumul_gain = 0.03125*MAX32(1024,*cumul_gain)*params->gain_cdbk[4*best_gain_index+3]; |
| #endif |
| /*printf ("%f\n", cumul_gain);*/ |
| /*printf ("encode pitch: %d %d\n", best_pitch, best_gain_index);*/ |
| SPEEX_COPY(exc, best_exc, nsf); |
| SPEEX_COPY(target, best_target, nsf); |
| #ifdef FIXED_POINT |
| /* Scale target back up if needed */ |
| if (scaledown) |
| { |
| for (i=0;i<nsf;i++) |
| target[i]=SHL16(target[i],1); |
| } |
| #endif |
| return pitch; |
| } |
| |
| void pitch_unquant_3tap( |
| spx_word16_t exc[], /* Input excitation */ |
| spx_word32_t exc_out[], /* Output excitation */ |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| const void *par, |
| int nsf, /* Number of samples in subframe */ |
| int *pitch_val, |
| spx_word16_t *gain_val, |
| SpeexBits *bits, |
| char *stack, |
| int count_lost, |
| int subframe_offset, |
| spx_word16_t last_pitch_gain, |
| int cdbk_offset |
| ) |
| { |
| int i; |
| int pitch; |
| int gain_index; |
| spx_word16_t gain[3]; |
| const signed char *gain_cdbk; |
| int gain_cdbk_size; |
| const ltp_params *params; |
| |
| params = (const ltp_params*) par; |
| gain_cdbk_size = 1<<params->gain_bits; |
| gain_cdbk = params->gain_cdbk + 4*gain_cdbk_size*cdbk_offset; |
| |
| pitch = speex_bits_unpack_unsigned(bits, params->pitch_bits); |
| pitch += start; |
| gain_index = speex_bits_unpack_unsigned(bits, params->gain_bits); |
| /*printf ("decode pitch: %d %d\n", pitch, gain_index);*/ |
| #ifdef FIXED_POINT |
| gain[0] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4]); |
| gain[1] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4+1]); |
| gain[2] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4+2]); |
| #else |
| gain[0] = 0.015625*gain_cdbk[gain_index*4]+.5; |
| gain[1] = 0.015625*gain_cdbk[gain_index*4+1]+.5; |
| gain[2] = 0.015625*gain_cdbk[gain_index*4+2]+.5; |
| #endif |
| |
| if (count_lost && pitch > subframe_offset) |
| { |
| spx_word16_t gain_sum; |
| if (1) { |
| #ifdef FIXED_POINT |
| spx_word16_t tmp = count_lost < 4 ? last_pitch_gain : SHR16(last_pitch_gain,1); |
| if (tmp>62) |
| tmp=62; |
| #else |
| spx_word16_t tmp = count_lost < 4 ? last_pitch_gain : 0.5 * last_pitch_gain; |
| if (tmp>.95) |
| tmp=.95; |
| #endif |
| gain_sum = gain_3tap_to_1tap(gain); |
| |
| if (gain_sum > tmp) |
| { |
| spx_word16_t fact = DIV32_16(SHL32(EXTEND32(tmp),14),gain_sum); |
| for (i=0;i<3;i++) |
| gain[i]=MULT16_16_Q14(fact,gain[i]); |
| } |
| |
| } |
| |
| } |
| |
| *pitch_val = pitch; |
| gain_val[0]=gain[0]; |
| gain_val[1]=gain[1]; |
| gain_val[2]=gain[2]; |
| gain[0] = SHL16(gain[0],7); |
| gain[1] = SHL16(gain[1],7); |
| gain[2] = SHL16(gain[2],7); |
| SPEEX_MEMSET(exc_out, 0, nsf); |
| for (i=0;i<3;i++) |
| { |
| int j; |
| int tmp1, tmp3; |
| int pp=pitch+1-i; |
| tmp1=nsf; |
| if (tmp1>pp) |
| tmp1=pp; |
| for (j=0;j<tmp1;j++) |
| exc_out[j]=MAC16_16(exc_out[j],gain[2-i],exc[j-pp]); |
| tmp3=nsf; |
| if (tmp3>pp+pitch) |
| tmp3=pp+pitch; |
| for (j=tmp1;j<tmp3;j++) |
| exc_out[j]=MAC16_16(exc_out[j],gain[2-i],exc[j-pp-pitch]); |
| } |
| /*for (i=0;i<nsf;i++) |
| exc[i]=PSHR32(exc32[i],13);*/ |
| } |
| |
| |
| /** Forced pitch delay and gain */ |
| int forced_pitch_quant( |
| spx_word16_t target[], /* Target vector */ |
| spx_word16_t *sw, |
| spx_coef_t ak[], /* LPCs for this subframe */ |
| spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| spx_sig_t exc[], /* Excitation */ |
| const void *par, |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| int p, /* Number of LPC coeffs */ |
| int nsf, /* Number of samples in subframe */ |
| SpeexBits *bits, |
| char *stack, |
| spx_word16_t *exc2, |
| spx_word16_t *r, |
| int complexity, |
| int cdbk_offset, |
| int plc_tuning, |
| spx_word32_t *cumul_gain |
| ) |
| { |
| int i; |
| VARDECL(spx_word16_t *res); |
| ALLOC(res, nsf, spx_word16_t); |
| #ifdef FIXED_POINT |
| if (pitch_coef>63) |
| pitch_coef=63; |
| #else |
| if (pitch_coef>.99) |
| pitch_coef=.99; |
| #endif |
| for (i=0;i<nsf&&i<start;i++) |
| { |
| exc[i]=MULT16_16(SHL16(pitch_coef, 7),exc2[i-start]); |
| } |
| for (;i<nsf;i++) |
| { |
| exc[i]=MULT16_32_Q15(SHL16(pitch_coef, 9),exc[i-start]); |
| } |
| for (i=0;i<nsf;i++) |
| res[i] = EXTRACT16(PSHR32(exc[i], SIG_SHIFT-1)); |
| syn_percep_zero16(res, ak, awk1, awk2, res, nsf, p, stack); |
| for (i=0;i<nsf;i++) |
| target[i]=EXTRACT16(SATURATE(SUB32(EXTEND32(target[i]),EXTEND32(res[i])),32700)); |
| return start; |
| } |
| |
| /** Unquantize forced pitch delay and gain */ |
| void forced_pitch_unquant( |
| spx_word16_t exc[], /* Input excitation */ |
| spx_word32_t exc_out[], /* Output excitation */ |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| const void *par, |
| int nsf, /* Number of samples in subframe */ |
| int *pitch_val, |
| spx_word16_t *gain_val, |
| SpeexBits *bits, |
| char *stack, |
| int count_lost, |
| int subframe_offset, |
| spx_word16_t last_pitch_gain, |
| int cdbk_offset |
| ) |
| { |
| int i; |
| #ifdef FIXED_POINT |
| if (pitch_coef>63) |
| pitch_coef=63; |
| #else |
| if (pitch_coef>.99) |
| pitch_coef=.99; |
| #endif |
| for (i=0;i<nsf;i++) |
| { |
| exc_out[i]=MULT16_16(exc[i-start],SHL16(pitch_coef,7)); |
| exc[i] = EXTRACT16(PSHR32(exc_out[i],13)); |
| } |
| *pitch_val = start; |
| gain_val[0]=gain_val[2]=0; |
| gain_val[1] = pitch_coef; |
| } |
