/* ** Copyright 2003-2010, VisualOn, Inc. ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */ /*********************************************************************** * File: c4t64fx.c * * * * Description:Performs algebraic codebook search for higher modes * * * ************************************************************************/ /************************************************************************ * Function: ACELP_4t64_fx() * * * * 20, 36, 44, 52, 64, 72, 88 bits algebraic codebook. * * 4 tracks x 16 positions per track = 64 samples. * * * * 20 bits --> 4 pulses in a frame of 64 samples. * * 36 bits --> 8 pulses in a frame of 64 samples. * * 44 bits --> 10 pulses in a frame of 64 samples. * * 52 bits --> 12 pulses in a frame of 64 samples. * * 64 bits --> 16 pulses in a frame of 64 samples. * * 72 bits --> 18 pulses in a frame of 64 samples. * * 88 bits --> 24 pulses in a frame of 64 samples. * * * * All pulses can have two (2) possible amplitudes: +1 or -1. * * Each pulse can have sixteen (16) possible positions. * *************************************************************************/ #include "typedef.h" #include "basic_op.h" #include "math_op.h" #include "acelp.h" #include "cnst.h" #include "q_pulse.h" #undef LOG_TAG #define LOG_TAG "amrwbenc" #include "log/log.h" static Word16 tipos[36] = { 0, 1, 2, 3, /* starting point &ipos[0], 1st iter */ 1, 2, 3, 0, /* starting point &ipos[4], 2nd iter */ 2, 3, 0, 1, /* starting point &ipos[8], 3rd iter */ 3, 0, 1, 2, /* starting point &ipos[12], 4th iter */ 0, 1, 2, 3, 1, 2, 3, 0, 2, 3, 0, 1, 3, 0, 1, 2, 0, 1, 2, 3}; /* end point for 24 pulses &ipos[35], 4th iter */ #define NB_PULSE_MAX 24 #define L_SUBFR 64 #define NB_TRACK 4 #define STEP 4 #define NB_POS 16 #define MSIZE 256 #define NB_MAX 8 #define NPMAXPT ((NB_PULSE_MAX+NB_TRACK-1)/NB_TRACK) /* Private functions */ void cor_h_vec_012( Word16 h[], /* (i) scaled impulse response */ Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */ Word16 track, /* (i) track to use */ Word16 sign[], /* (i) sign vector */ Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */ Word16 cor_1[], /* (o) result of correlation (NB_POS elements) */ Word16 cor_2[] /* (o) result of correlation (NB_POS elements) */ ); void cor_h_vec_012_asm( Word16 h[], /* (i) scaled impulse response */ Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */ Word16 track, /* (i) track to use */ Word16 sign[], /* (i) sign vector */ Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */ Word16 cor_1[], /* (o) result of correlation (NB_POS elements) */ Word16 cor_2[] /* (o) result of correlation (NB_POS elements) */ ); void cor_h_vec_30( Word16 h[], /* (i) scaled impulse response */ Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */ Word16 track, /* (i) track to use */ Word16 sign[], /* (i) sign vector */ Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */ Word16 cor_1[], /* (o) result of correlation (NB_POS elements) */ Word16 cor_2[] /* (o) result of correlation (NB_POS elements) */ ); void search_ixiy( Word16 nb_pos_ix, /* (i) nb of pos for pulse 1 (1..8) */ Word16 track_x, /* (i) track of pulse 1 */ Word16 track_y, /* (i) track of pulse 2 */ Word16 * ps, /* (i/o) correlation of all fixed pulses */ Word16 * alp, /* (i/o) energy of all fixed pulses */ Word16 * ix, /* (o) position of pulse 1 */ Word16 * iy, /* (o) position of pulse 2 */ Word16 dn[], /* (i) corr. between target and h[] */ Word16 dn2[], /* (i) vector of selected positions */ Word16 cor_x[], /* (i) corr. of pulse 1 with fixed pulses */ Word16 cor_y[], /* (i) corr. of pulse 2 with fixed pulses */ Word16 rrixiy[][MSIZE] /* (i) corr. of pulse 1 with pulse 2 */ ); void ACELP_4t64_fx( Word16 dn[], /* (i) <12b : correlation between target x[] and H[] */ Word16 cn[], /* (i) <12b : residual after long term prediction */ Word16 H[], /* (i) Q12: impulse response of weighted synthesis filter */ Word16 code[], /* (o) Q9 : algebraic (fixed) codebook excitation */ Word16 y[], /* (o) Q9 : filtered fixed codebook excitation */ Word16 nbbits, /* (i) : 20, 36, 44, 52, 64, 72 or 88 bits */ Word16 ser_size, /* (i) : bit rate */ Word16 _index[] /* (o) : index (20): 5+5+5+5 = 20 bits. */ /* (o) : index (36): 9+9+9+9 = 36 bits. */ /* (o) : index (44): 13+9+13+9 = 44 bits. */ /* (o) : index (52): 13+13+13+13 = 52 bits. */ /* (o) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. */ /* (o) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. */ /* (o) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. */ ) { Word32 i, j, k; Word16 st, ix, iy, pos, index, track, nb_pulse, nbiter, j_temp; Word16 psk, ps, alpk, alp, val, k_cn, k_dn, exp; Word16 *p0, *p1, *p2, *p3, *psign; Word16 *h, *h_inv, *ptr_h1, *ptr_h2, *ptr_hf, h_shift; Word32 s, cor, L_tmp, L_index; Word16 dn2[L_SUBFR], sign[L_SUBFR], vec[L_SUBFR]; Word16 ind[NPMAXPT * NB_TRACK]; Word16 codvec[NB_PULSE_MAX], nbpos[10]; Word16 cor_x[NB_POS], cor_y[NB_POS], pos_max[NB_TRACK]; Word16 h_buf[4 * L_SUBFR]; Word16 rrixix[NB_TRACK][NB_POS], rrixiy[NB_TRACK][MSIZE]; Word16 ipos[NB_PULSE_MAX]; switch (nbbits) { case 20: /* 20 bits, 4 pulses, 4 tracks */ nbiter = 4; /* 4x16x16=1024 loop */ alp = 8192; /* alp = 2.0 (Q12) */ nb_pulse = 4; nbpos[0] = 4; nbpos[1] = 8; break; case 36: /* 36 bits, 8 pulses, 4 tracks */ nbiter = 4; /* 4x20x16=1280 loop */ alp = 4096; /* alp = 1.0 (Q12) */ nb_pulse = 8; nbpos[0] = 4; nbpos[1] = 8; nbpos[2] = 8; break; case 44: /* 44 bits, 10 pulses, 4 tracks */ nbiter = 4; /* 4x26x16=1664 loop */ alp = 4096; /* alp = 1.0 (Q12) */ nb_pulse = 10; nbpos[0] = 4; nbpos[1] = 6; nbpos[2] = 8; nbpos[3] = 8; break; case 52: /* 52 bits, 12 pulses, 4 tracks */ nbiter = 4; /* 4x26x16=1664 loop */ alp = 4096; /* alp = 1.0 (Q12) */ nb_pulse = 12; nbpos[0] = 4; nbpos[1] = 6; nbpos[2] = 8; nbpos[3] = 8; break; case 64: /* 64 bits, 16 pulses, 4 tracks */ nbiter = 3; /* 3x36x16=1728 loop */ alp = 3277; /* alp = 0.8 (Q12) */ nb_pulse = 16; nbpos[0] = 4; nbpos[1] = 4; nbpos[2] = 6; nbpos[3] = 6; nbpos[4] = 8; nbpos[5] = 8; break; case 72: /* 72 bits, 18 pulses, 4 tracks */ nbiter = 3; /* 3x35x16=1680 loop */ alp = 3072; /* alp = 0.75 (Q12) */ nb_pulse = 18; nbpos[0] = 2; nbpos[1] = 3; nbpos[2] = 4; nbpos[3] = 5; nbpos[4] = 6; nbpos[5] = 7; nbpos[6] = 8; break; case 88: /* 88 bits, 24 pulses, 4 tracks */ if(ser_size > 462) nbiter = 1; else nbiter = 2; /* 2x53x16=1696 loop */ alp = 2048; /* alp = 0.5 (Q12) */ nb_pulse = 24; nbpos[0] = 2; nbpos[1] = 2; nbpos[2] = 3; nbpos[3] = 4; nbpos[4] = 5; nbpos[5] = 6; nbpos[6] = 7; nbpos[7] = 8; nbpos[8] = 8; nbpos[9] = 8; break; default: nbiter = 0; alp = 0; nb_pulse = 0; } for (i = 0; i < nb_pulse; i++) { codvec[i] = i; } /*----------------------------------------------------------------* * Find sign for each pulse position. * *----------------------------------------------------------------*/ /* calculate energy for normalization of cn[] and dn[] */ /* set k_cn = 32..32767 (ener_cn = 2^30..256-0) */ #ifdef ASM_OPT /* asm optimization branch */ s = Dot_product12_asm(cn, cn, L_SUBFR, &exp); #else s = Dot_product12(cn, cn, L_SUBFR, &exp); #endif Isqrt_n(&s, &exp); s = L_shl(s, (exp + 5)); k_cn = extract_h(L_add(s, 0x8000)); /* set k_dn = 32..512 (ener_dn = 2^30..2^22) */ #ifdef ASM_OPT /* asm optimization branch */ s = Dot_product12_asm(dn, dn, L_SUBFR, &exp); #else s = Dot_product12(dn, dn, L_SUBFR, &exp); #endif Isqrt_n(&s, &exp); k_dn = voround(L_shl(s, (exp + 5 + 3))); /* k_dn = 256..4096 */ k_dn = vo_mult_r(alp, k_dn); /* alp in Q12 */ /* mix normalized cn[] and dn[] */ p0 = cn; p1 = dn; p2 = dn2; for (i = 0; i < L_SUBFR/4; i++) { s = L_add((k_cn* (*p0++)), (k_dn * (*p1++))); *p2++ = s >> 7; s = L_add((k_cn* (*p0++)), (k_dn * (*p1++))); *p2++ = s >> 7; s = L_add((k_cn* (*p0++)), (k_dn * (*p1++))); *p2++ = s >> 7; s = L_add((k_cn* (*p0++)), (k_dn * (*p1++))); *p2++ = s >> 7; } /* set sign according to dn2[] = k_cn*cn[] + k_dn*dn[] */ for(i = 0; i < L_SUBFR; i++) { val = dn[i]; ps = dn2[i]; if (ps >= 0) { sign[i] = 32767; /* sign = +1 (Q12) */ vec[i] = -32768; } else { sign[i] = -32768; /* sign = -1 (Q12) */ vec[i] = 32767; dn[i] = -val; dn2[i] = -ps; } } /*----------------------------------------------------------------* * Select NB_MAX position per track according to max of dn2[]. * *----------------------------------------------------------------*/ pos = 0; for (i = 0; i < NB_TRACK; i++) { for (k = 0; k < NB_MAX; k++) { ps = -1; for (j = i; j < L_SUBFR; j += STEP) { if(dn2[j] > ps) { ps = dn2[j]; pos = j; } } dn2[pos] = (k - NB_MAX); /* dn2 < 0 when position is selected */ if (k == 0) { pos_max[i] = pos; } } } /*--------------------------------------------------------------* * Scale h[] to avoid overflow and to get maximum of precision * * on correlation. * * * * Maximum of h[] (h[0]) is fixed to 2048 (MAX16 / 16). * * ==> This allow addition of 16 pulses without saturation. * * * * Energy worst case (on resonant impulse response), * * - energy of h[] is approximately MAX/16. * * - During search, the energy is divided by 8 to avoid * * overflow on "alp". (energy of h[] = MAX/128). * * ==> "alp" worst case detected is 22854 on sinusoidal wave. * *--------------------------------------------------------------*/ /* impulse response buffer for fast computation */ h = h_buf; h_inv = h_buf + (2 * L_SUBFR); L_tmp = 0; for (i = 0; i < L_SUBFR; i++) { *h++ = 0; *h_inv++ = 0; L_tmp = L_add(L_tmp, (H[i] * H[i]) << 1); } /* scale h[] down (/2) when energy of h[] is high with many pulses used */ val = extract_h(L_tmp); h_shift = 0; if ((nb_pulse >= 12) && (val > 1024)) { h_shift = 1; } p0 = H; p1 = h; p2 = h_inv; for (i = 0; i < L_SUBFR/4; i++) { *p1 = *p0++ >> h_shift; *p2++ = -(*p1++); *p1 = *p0++ >> h_shift; *p2++ = -(*p1++); *p1 = *p0++ >> h_shift; *p2++ = -(*p1++); *p1 = *p0++ >> h_shift; *p2++ = -(*p1++); } /*------------------------------------------------------------* * Compute rrixix[][] needed for the codebook search. * * This algorithm compute impulse response energy of all * * positions (16) in each track (4). Total = 4x16 = 64. * *------------------------------------------------------------*/ /* storage order --> i3i3, i2i2, i1i1, i0i0 */ /* Init pointers to last position of rrixix[] */ p0 = &rrixix[0][NB_POS - 1]; p1 = &rrixix[1][NB_POS - 1]; p2 = &rrixix[2][NB_POS - 1]; p3 = &rrixix[3][NB_POS - 1]; ptr_h1 = h; cor = 0x00008000L; /* for rounding */ for (i = 0; i < NB_POS; i++) { cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h1))); ptr_h1++; *p3-- = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h1))); ptr_h1++; *p2-- = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h1))); ptr_h1++; *p1-- = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h1))); ptr_h1++; *p0-- = extract_h(cor); } /*------------------------------------------------------------* * Compute rrixiy[][] needed for the codebook search. * * This algorithm compute correlation between 2 pulses * * (2 impulses responses) in 4 possible adjacents tracks. * * (track 0-1, 1-2, 2-3 and 3-0). Total = 4x16x16 = 1024. * *------------------------------------------------------------*/ /* storage order --> i2i3, i1i2, i0i1, i3i0 */ pos = MSIZE - 1; ptr_hf = h + 1; for (k = 0; k < NB_POS; k++) { p3 = &rrixiy[2][pos]; p2 = &rrixiy[1][pos]; p1 = &rrixiy[0][pos]; p0 = &rrixiy[3][pos - NB_POS]; cor = 0x00008000L; /* for rounding */ ptr_h1 = h; ptr_h2 = ptr_hf; for (i = k + 1; i < NB_POS; i++) { cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p3 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p2 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p1 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p0 = extract_h(cor); p3 -= (NB_POS + 1); p2 -= (NB_POS + 1); p1 -= (NB_POS + 1); p0 -= (NB_POS + 1); } cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p3 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p2 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p1 = extract_h(cor); pos -= NB_POS; ptr_hf += STEP; } /* storage order --> i3i0, i2i3, i1i2, i0i1 */ pos = MSIZE - 1; ptr_hf = h + 3; for (k = 0; k < NB_POS; k++) { p3 = &rrixiy[3][pos]; p2 = &rrixiy[2][pos - 1]; p1 = &rrixiy[1][pos - 1]; p0 = &rrixiy[0][pos - 1]; cor = 0x00008000L; /* for rounding */ ptr_h1 = h; ptr_h2 = ptr_hf; for (i = k + 1; i < NB_POS; i++) { cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p3 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p2 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p1 = extract_h(cor); cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p0 = extract_h(cor); p3 -= (NB_POS + 1); p2 -= (NB_POS + 1); p1 -= (NB_POS + 1); p0 -= (NB_POS + 1); } cor = L_add(cor, vo_L_mult((*ptr_h1), (*ptr_h2))); ptr_h1++; ptr_h2++; *p3 = extract_h(cor); pos--; ptr_hf += STEP; } /*------------------------------------------------------------* * Modification of rrixiy[][] to take signs into account. * *------------------------------------------------------------*/ p0 = &rrixiy[0][0]; for (k = 0; k < NB_TRACK; k++) { j_temp = (k + 1)&0x03; for (i = k; i < L_SUBFR; i += STEP) { psign = sign; if (psign[i] < 0) { psign = vec; } j = j_temp; for (; j < L_SUBFR; j += STEP) { *p0 = vo_mult(*p0, psign[j]); p0++; } } } /*-------------------------------------------------------------------* * Deep first search * *-------------------------------------------------------------------*/ psk = -1; alpk = 1; for (k = 0; k < nbiter; k++) { j_temp = k<<2; for (i = 0; i < nb_pulse; i++) ipos[i] = tipos[j_temp + i]; if(nbbits == 20) { pos = 0; ps = 0; alp = 0; for (i = 0; i < L_SUBFR; i++) { vec[i] = 0; } } else if ((nbbits == 36) || (nbbits == 44)) { /* first stage: fix 2 pulses */ pos = 2; ix = ind[0] = pos_max[ipos[0]]; iy = ind[1] = pos_max[ipos[1]]; ps = dn[ix] + dn[iy]; i = ix >> 2; /* ix / STEP */ j = iy >> 2; /* iy / STEP */ s = rrixix[ipos[0]][i] << 13; s += rrixix[ipos[1]][j] << 13; i = (i << 4) + j; /* (ix/STEP)*NB_POS + (iy/STEP) */ s += rrixiy[ipos[0]][i] << 14; alp = (s + 0x8000) >> 16; if (sign[ix] < 0) p0 = h_inv - ix; else p0 = h - ix; if (sign[iy] < 0) p1 = h_inv - iy; else p1 = h - iy; for (i = 0; i < L_SUBFR; i++) { vec[i] = (*p0++) + (*p1++); } if(nbbits == 44) { ipos[8] = 0; ipos[9] = 1; } } else { /* first stage: fix 4 pulses */ pos = 4; ix = ind[0] = pos_max[ipos[0]]; iy = ind[1] = pos_max[ipos[1]]; i = ind[2] = pos_max[ipos[2]]; j = ind[3] = pos_max[ipos[3]]; ps = add1(add1(add1(dn[ix], dn[iy]), dn[i]), dn[j]); if (sign[ix] < 0) p0 = h_inv - ix; else p0 = h - ix; if (sign[iy] < 0) p1 = h_inv - iy; else p1 = h - iy; if (sign[i] < 0) p2 = h_inv - i; else p2 = h - i; if (sign[j] < 0) p3 = h_inv - j; else p3 = h - j; L_tmp = 0L; for(i = 0; i < L_SUBFR; i++) { Word32 vecSq2; vec[i] = add1(add1(add1(*p0++, *p1++), *p2++), *p3++); vecSq2 = (vec[i] * vec[i]) << 1; if (vecSq2 > 0 && L_tmp > INT_MAX - vecSq2) { L_tmp = INT_MAX; } else if (vecSq2 < 0 && L_tmp < INT_MIN - vecSq2) { L_tmp = INT_MIN; } else { L_tmp += vecSq2; } } alp = ((L_tmp >> 3) + 0x8000) >> 16; if(nbbits == 72) { ipos[16] = 0; ipos[17] = 1; } } /* other stages of 2 pulses */ for (j = pos, st = 0; j < nb_pulse; j += 2, st++) { /*--------------------------------------------------* * Calculate correlation of all possible positions * * of the next 2 pulses with previous fixed pulses. * * Each pulse can have 16 possible positions. * *--------------------------------------------------*/ if(ipos[j] == 3) { cor_h_vec_30(h, vec, ipos[j], sign, rrixix, cor_x, cor_y); } else { #ifdef ASM_OPT /* asm optimization branch */ cor_h_vec_012_asm(h, vec, ipos[j], sign, rrixix, cor_x, cor_y); #else cor_h_vec_012(h, vec, ipos[j], sign, rrixix, cor_x, cor_y); #endif } /*--------------------------------------------------* * Find best positions of 2 pulses. * *--------------------------------------------------*/ search_ixiy(nbpos[st], ipos[j], ipos[j + 1], &ps, &alp, &ix, &iy, dn, dn2, cor_x, cor_y, rrixiy); ind[j] = ix; ind[j + 1] = iy; if (sign[ix] < 0) p0 = h_inv - ix; else p0 = h - ix; if (sign[iy] < 0) p1 = h_inv - iy; else p1 = h - iy; for (i = 0; i < L_SUBFR; i+=4) { vec[i] += add1((*p0++), (*p1++)); vec[i+1] += add1((*p0++), (*p1++)); vec[i+2] += add1((*p0++), (*p1++)); vec[i+3] += add1((*p0++), (*p1++)); } } /* memorise the best codevector */ ps = vo_mult(ps, ps); s = L_sub(vo_L_mult(alpk, ps), vo_L_mult(psk, alp)); if (s > 0) { psk = ps; alpk = alp; for (i = 0; i < nb_pulse; i++) { codvec[i] = ind[i]; } for (i = 0; i < L_SUBFR; i++) { y[i] = vec[i]; } } } /*-------------------------------------------------------------------* * Build the codeword, the filtered codeword and index of codevector.* *-------------------------------------------------------------------*/ for (i = 0; i < NPMAXPT * NB_TRACK; i++) { ind[i] = -1; } for (i = 0; i < L_SUBFR; i++) { code[i] = 0; y[i] = vo_shr_r(y[i], 3); /* Q12 to Q9 */ } val = (512 >> h_shift); /* codeword in Q9 format */ for (k = 0; k < nb_pulse; k++) { i = codvec[k]; /* read pulse position */ j = sign[i]; /* read sign */ index = i >> 2; /* index = pos of pulse (0..15) */ track = (Word16) (i & 0x03); /* track = i % NB_TRACK (0..3) */ if (j > 0) { code[i] += val; codvec[k] += 128; } else { code[i] -= val; index += NB_POS; } i = (Word16)((vo_L_mult(track, NPMAXPT) >> 1)); while (i < NPMAXPT * NB_TRACK && ind[i] >= 0) { i += 1; } if (i < NPMAXPT * NB_TRACK) { ind[i] = index; } else { ALOGE("b/132647222, OOB access in ind array track=%d i=%d", track, i); android_errorWriteLog(0x534e4554, "132647222"); } } k = 0; /* Build index of codevector */ if(nbbits == 20) { for (track = 0; track < NB_TRACK; track++) { _index[track] = (Word16)(quant_1p_N1(ind[k], 4)); k += NPMAXPT; } } else if(nbbits == 36) { for (track = 0; track < NB_TRACK; track++) { _index[track] = (Word16)(quant_2p_2N1(ind[k], ind[k + 1], 4)); k += NPMAXPT; } } else if(nbbits == 44) { for (track = 0; track < NB_TRACK - 2; track++) { _index[track] = (Word16)(quant_3p_3N1(ind[k], ind[k + 1], ind[k + 2], 4)); k += NPMAXPT; } for (track = 2; track < NB_TRACK; track++) { _index[track] = (Word16)(quant_2p_2N1(ind[k], ind[k + 1], 4)); k += NPMAXPT; } } else if(nbbits == 52) { for (track = 0; track < NB_TRACK; track++) { _index[track] = (Word16)(quant_3p_3N1(ind[k], ind[k + 1], ind[k + 2], 4)); k += NPMAXPT; } } else if(nbbits == 64) { for (track = 0; track < NB_TRACK; track++) { L_index = quant_4p_4N(&ind[k], 4); _index[track] = (Word16)((L_index >> 14) & 3); _index[track + NB_TRACK] = (Word16)(L_index & 0x3FFF); k += NPMAXPT; } } else if(nbbits == 72) { for (track = 0; track < NB_TRACK - 2; track++) { L_index = quant_5p_5N(&ind[k], 4); _index[track] = (Word16)((L_index >> 10) & 0x03FF); _index[track + NB_TRACK] = (Word16)(L_index & 0x03FF); k += NPMAXPT; } for (track = 2; track < NB_TRACK; track++) { L_index = quant_4p_4N(&ind[k], 4); _index[track] = (Word16)((L_index >> 14) & 3); _index[track + NB_TRACK] = (Word16)(L_index & 0x3FFF); k += NPMAXPT; } } else if(nbbits == 88) { for (track = 0; track < NB_TRACK; track++) { L_index = quant_6p_6N_2(&ind[k], 4); _index[track] = (Word16)((L_index >> 11) & 0x07FF); _index[track + NB_TRACK] = (Word16)(L_index & 0x07FF); k += NPMAXPT; } } return; } /*-------------------------------------------------------------------* * Function cor_h_vec() * * ~~~~~~~~~~~~~~~~~~~~~ * * Compute correlations of h[] with vec[] for the specified track. * *-------------------------------------------------------------------*/ void cor_h_vec_30( Word16 h[], /* (i) scaled impulse response */ Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */ Word16 track, /* (i) track to use */ Word16 sign[], /* (i) sign vector */ Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */ Word16 cor_1[], /* (o) result of correlation (NB_POS elements) */ Word16 cor_2[] /* (o) result of correlation (NB_POS elements) */ ) { Word32 i, j, pos, corr; Word16 *p0, *p1, *p2,*p3,*cor_x,*cor_y; Word32 L_sum1,L_sum2; cor_x = cor_1; cor_y = cor_2; p0 = rrixix[track]; p3 = rrixix[0]; pos = track; for (i = 0; i < NB_POS; i+=2) { L_sum1 = L_sum2 = 0L; p1 = h; p2 = &vec[pos]; for (j=pos;j < L_SUBFR; j++) { L_sum1 = L_add(L_sum1, *p1 * *p2); p2-=3; L_sum2 = L_add(L_sum2, *p1++ * *p2); p2+=4; } p2-=3; L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum1 = L_shl(L_sum1, 2); L_sum2 = L_shl(L_sum2, 2); corr = voround(L_sum1); *cor_x++ = mult(corr, sign[pos]) + (*p0++); corr = voround(L_sum2); *cor_y++ = mult(corr, sign[pos-3]) + (*p3++); pos += STEP; L_sum1 = L_sum2 = 0L; p1 = h; p2 = &vec[pos]; for (j=pos;j < L_SUBFR; j++) { L_sum1 = L_add(L_sum1, *p1 * *p2); p2-=3; L_sum2 = L_add(L_sum2, *p1++ * *p2); p2+=4; } p2-=3; L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2++); L_sum1 = L_shl(L_sum1, 2); L_sum2 = L_shl(L_sum2, 2); corr = voround(L_sum1); *cor_x++ = mult(corr, sign[pos]) + (*p0++); corr = voround(L_sum2); *cor_y++ = mult(corr, sign[pos-3]) + (*p3++); pos += STEP; } return; } void cor_h_vec_012( Word16 h[], /* (i) scaled impulse response */ Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */ Word16 track, /* (i) track to use */ Word16 sign[], /* (i) sign vector */ Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */ Word16 cor_1[], /* (o) result of correlation (NB_POS elements) */ Word16 cor_2[] /* (o) result of correlation (NB_POS elements) */ ) { Word32 i, j, pos, corr; Word16 *p0, *p1, *p2,*p3,*cor_x,*cor_y; Word32 L_sum1,L_sum2; cor_x = cor_1; cor_y = cor_2; p0 = rrixix[track]; p3 = rrixix[track+1]; pos = track; for (i = 0; i < NB_POS; i+=2) { L_sum1 = L_sum2 = 0L; p1 = h; p2 = &vec[pos]; for (j=62-pos ;j >= 0; j--) { L_sum1 = L_add(L_sum1, *p1 * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2); } L_sum1 = L_add(L_sum1, *p1 * *p2); L_sum1 = L_shl(L_sum1, 2); L_sum2 = L_shl(L_sum2, 2); corr = voround(L_sum1); cor_x[i] = vo_mult(corr, sign[pos]) + (*p0++); corr = voround(L_sum2); cor_y[i] = vo_mult(corr, sign[pos + 1]) + (*p3++); pos += STEP; L_sum1 = L_sum2 = 0L; p1 = h; p2 = &vec[pos]; for (j= 62-pos;j >= 0; j--) { L_sum1 = L_add(L_sum1, *p1 * *p2++); L_sum2 = L_add(L_sum2, *p1++ * *p2); } L_sum1 = L_add(L_sum1, *p1 * *p2); L_sum1 = L_shl(L_sum1, 2); L_sum2 = L_shl(L_sum2, 2); corr = voround(L_sum1); cor_x[i+1] = vo_mult(corr, sign[pos]) + (*p0++); corr = voround(L_sum2); cor_y[i+1] = vo_mult(corr, sign[pos + 1]) + (*p3++); pos += STEP; } return; } /*-------------------------------------------------------------------* * Function search_ixiy() * * ~~~~~~~~~~~~~~~~~~~~~~~ * * Find the best positions of 2 pulses in a subframe. * *-------------------------------------------------------------------*/ void search_ixiy( Word16 nb_pos_ix, /* (i) nb of pos for pulse 1 (1..8) */ Word16 track_x, /* (i) track of pulse 1 */ Word16 track_y, /* (i) track of pulse 2 */ Word16 * ps, /* (i/o) correlation of all fixed pulses */ Word16 * alp, /* (i/o) energy of all fixed pulses */ Word16 * ix, /* (o) position of pulse 1 */ Word16 * iy, /* (o) position of pulse 2 */ Word16 dn[], /* (i) corr. between target and h[] */ Word16 dn2[], /* (i) vector of selected positions */ Word16 cor_x[], /* (i) corr. of pulse 1 with fixed pulses */ Word16 cor_y[], /* (i) corr. of pulse 2 with fixed pulses */ Word16 rrixiy[][MSIZE] /* (i) corr. of pulse 1 with pulse 2 */ ) { Word32 x, y, pos, thres_ix; Word16 ps1, ps2, sq, sqk; Word16 alp_16, alpk; Word16 *p0, *p1, *p2; Word32 s, alp0, alp1, alp2; p0 = cor_x; p1 = cor_y; p2 = rrixiy[track_x]; thres_ix = nb_pos_ix - NB_MAX; alp0 = L_deposit_h(*alp); alp0 = (alp0 + 0x00008000L); /* for rounding */ sqk = -1; alpk = 1; for (x = track_x; x < L_SUBFR; x += STEP) { ps1 = *ps + dn[x]; alp1 = L_add(alp0, ((*p0++)<<13)); if (dn2[x] < thres_ix) { pos = -1; for (y = track_y; y < L_SUBFR; y += STEP) { ps2 = add1(ps1, dn[y]); alp2 = L_add(alp1, ((*p1++)<<13)); alp2 = L_add(alp2, ((*p2++)<<14)); alp_16 = extract_h(alp2); sq = vo_mult(ps2, ps2); s = L_sub(vo_L_mult(alpk, sq), L_mult(sqk, alp_16)); if (s > 0) { sqk = sq; alpk = alp_16; pos = y; } } p1 -= NB_POS; if (pos >= 0) { *ix = x; *iy = pos; } } else { p2 += NB_POS; } } *ps = add1(*ps, add1(dn[*ix], dn[*iy])); *alp = alpk; return; }