diff options
Diffstat (limited to 'src/libspeex/ltp.c')
| -rw-r--r-- | src/libspeex/ltp.c | 839 |
1 files changed, 839 insertions, 0 deletions
diff --git a/src/libspeex/ltp.c b/src/libspeex/ltp.c new file mode 100644 index 0000000..0129c95 --- /dev/null +++ b/src/libspeex/ltp.c @@ -0,0 +1,839 @@ +/* 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; +} |