ref: 31703a27d9c753d0fe8b8aa039a2463742e6df53
dir: /libfaad/sbr_hfadj.c/
/* ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding ** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ** ** Any non-GPL usage of this software or parts of this software is strictly ** forbidden. ** ** Commercial non-GPL licensing of this software is possible. ** For more info contact Ahead Software through [email protected]. ** ** $Id: sbr_hfadj.c,v 1.10 2004/01/05 14:05:12 menno Exp $ **/ /* High Frequency adjustment */ #include "common.h" #include "structs.h" #ifdef SBR_DEC #include "sbr_syntax.h" #include "sbr_hfadj.h" #include "sbr_noise.h" /* static function delcarations */ static void map_noise_data(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch); static void map_sinusoids(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch); static void estimate_current_envelope(sbr_info *sbr, sbr_hfadj_info *adj, qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch); static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch); #ifdef SBR_LOW_POWER static void calc_gain_groups(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch); static void aliasing_reduction(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch); #endif static void hf_assembly(sbr_info *sbr, sbr_hfadj_info *adj, qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch); void hf_adjustment(sbr_info *sbr, qmf_t Xsbr[MAX_NTSRHFG][64] #ifdef SBR_LOW_POWER ,real_t *deg /* aliasing degree */ #endif ,uint8_t ch) { ALIGN sbr_hfadj_info adj = {{{0}}}; map_noise_data(sbr, &adj, ch); map_sinusoids(sbr, &adj, ch); estimate_current_envelope(sbr, &adj, Xsbr, ch); calculate_gain(sbr, &adj, ch); #ifdef SBR_LOW_POWER calc_gain_groups(sbr, &adj, deg, ch); aliasing_reduction(sbr, &adj, deg, ch); #endif hf_assembly(sbr, &adj, Xsbr, ch); } static void map_noise_data(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch) { uint8_t l, i; uint32_t m; for (l = 0; l < sbr->L_E[ch]; l++) { for (i = 0; i < sbr->N_Q; i++) { for (m = sbr->f_table_noise[i]; m < sbr->f_table_noise[i+1]; m++) { uint8_t k; adj->Q_mapped[m - sbr->kx][l] = 0; for (k = 0; k < 2; k++) { if ((sbr->t_E[ch][l] >= sbr->t_Q[ch][k]) && (sbr->t_E[ch][l+1] <= sbr->t_Q[ch][k+1])) { adj->Q_mapped[m - sbr->kx][l] = sbr->Q_orig[ch][i][k]; } } } } } } static void map_sinusoids(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch) { uint8_t l, i, m, k, k1, k2, delta_S, l_i, u_i; if (sbr->bs_frame_class[ch] == FIXFIX) { sbr->l_A[ch] = -1; } else if (sbr->bs_frame_class[ch] == VARFIX) { if (sbr->bs_pointer[ch] > 1) sbr->l_A[ch] = -1; else sbr->l_A[ch] = sbr->bs_pointer[ch] - 1; } else { if (sbr->bs_pointer[ch] == 0) sbr->l_A[ch] = -1; else sbr->l_A[ch] = sbr->L_E[ch] + 1 - sbr->bs_pointer[ch]; } for (l = 0; l < 5; l++) { for (i = 0; i < 64; i++) { adj->S_index_mapped[i][l] = 0; adj->S_mapped[i][l] = 0; } } for (l = 0; l < sbr->L_E[ch]; l++) { for (i = 0; i < sbr->N_high; i++) { for (m = sbr->f_table_res[HI_RES][i]; m < sbr->f_table_res[HI_RES][i+1]; m++) { uint8_t delta_step = 0; if ((l >= sbr->l_A[ch]) || ((sbr->bs_add_harmonic_prev[ch][i]) && (sbr->bs_add_harmonic_flag_prev[ch]))) { delta_step = 1; } if (m == (int32_t)((real_t)(sbr->f_table_res[HI_RES][i+1]+sbr->f_table_res[HI_RES][i])/2.)) { adj->S_index_mapped[m - sbr->kx][l] = delta_step * sbr->bs_add_harmonic[ch][i]; } else { adj->S_index_mapped[m - sbr->kx][l] = 0; } } } } for (l = 0; l < sbr->L_E[ch]; l++) { for (i = 0; i < sbr->N_high; i++) { if (sbr->f[ch][l] == 1) { k1 = i; k2 = i + 1; } else { for (k1 = 0; k1 < sbr->N_low; k1++) { if ((sbr->f_table_res[HI_RES][i] >= sbr->f_table_res[LO_RES][k1]) && (sbr->f_table_res[HI_RES][i+1] <= sbr->f_table_res[LO_RES][k1+1])) { break; } } for (k2 = 0; k2 < sbr->N_low; k2++) { if ((sbr->f_table_res[HI_RES][i+1] >= sbr->f_table_res[LO_RES][k2]) && (sbr->f_table_res[HI_RES][i+2] <= sbr->f_table_res[LO_RES][k2+1])) { break; } } } l_i = sbr->f_table_res[sbr->f[ch][l]][k1]; u_i = sbr->f_table_res[sbr->f[ch][l]][k2]; delta_S = 0; for (k = l_i; k < u_i; k++) { if (adj->S_index_mapped[k - sbr->kx][l] == 1) delta_S = 1; } for (m = l_i; m < u_i; m++) { adj->S_mapped[m - sbr->kx][l] = delta_S; } } } } static void estimate_current_envelope(sbr_info *sbr, sbr_hfadj_info *adj, qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch) { uint8_t m, l, j, k, k_l, k_h, p; real_t nrg, div; if (sbr->bs_interpol_freq == 1) { for (l = 0; l < sbr->L_E[ch]; l++) { uint8_t i, l_i, u_i; l_i = sbr->t_E[ch][l]; u_i = sbr->t_E[ch][l+1]; div = (real_t)(u_i - l_i); for (m = 0; m < sbr->M; m++) { nrg = 0; for (i = l_i + sbr->tHFAdj; i < u_i + sbr->tHFAdj; i++) { nrg += MUL_R(QMF_RE(Xsbr[i][m + sbr->kx]), QMF_RE(Xsbr[i][m + sbr->kx])) #ifndef SBR_LOW_POWER + MUL_R(QMF_IM(Xsbr[i][m + sbr->kx]), QMF_IM(Xsbr[i][m + sbr->kx])) #endif ; } sbr->E_curr[ch][m][l] = nrg / div; #ifdef SBR_LOW_POWER sbr->E_curr[ch][m][l] *= 2; #endif } } } else { for (l = 0; l < sbr->L_E[ch]; l++) { for (p = 0; p < sbr->n[sbr->f[ch][l]]; p++) { k_l = sbr->f_table_res[sbr->f[ch][l]][p]; k_h = sbr->f_table_res[sbr->f[ch][l]][p+1]; for (k = k_l; k < k_h; k++) { uint8_t i, l_i, u_i; nrg = 0.0; l_i = sbr->t_E[ch][l]; u_i = sbr->t_E[ch][l+1]; div = (real_t)((u_i - l_i)*(k_h - k_l)); for (i = l_i + sbr->tHFAdj; i < u_i + sbr->tHFAdj; i++) { for (j = k_l; j < k_h; j++) { nrg += MUL_R(QMF_RE(Xsbr[i][j]), QMF_RE(Xsbr[i][j])) #ifndef SBR_LOW_POWER + MUL_R(QMF_IM(Xsbr[i][j]), QMF_IM(Xsbr[i][j])) #endif ; } } sbr->E_curr[ch][k - sbr->kx][l] = nrg / div; #ifdef SBR_LOW_POWER sbr->E_curr[ch][k - sbr->kx][l] *= 2; #endif } } } } } #define EPS (1e-12) #define ONE (1) static void calculate_gain(sbr_info *sbr, sbr_hfadj_info *adj, uint8_t ch) { static real_t limGain[] = { 0.5, 1.0, 2.0, 1e10 }; uint8_t m, l, k, i; ALIGN real_t Q_M_lim[64]; ALIGN real_t G_lim[64]; ALIGN real_t G_boost; ALIGN real_t S_M[64]; ALIGN uint8_t table_map_res_to_m[64]; for (l = 0; l < sbr->L_E[ch]; l++) { real_t delta = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 0 : 1; for (i = 0; i < sbr->n[sbr->f[ch][l]]; i++) { for (m = sbr->f_table_res[sbr->f[ch][l]][i]; m < sbr->f_table_res[sbr->f[ch][l]][i+1]; m++) { table_map_res_to_m[m - sbr->kx] = i; } } for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++) { real_t G_max; real_t den = 0; real_t acc1 = 0; real_t acc2 = 0; for (m = sbr->f_table_lim[sbr->bs_limiter_bands][k]; m < sbr->f_table_lim[sbr->bs_limiter_bands][k+1]; m++) { acc1 += sbr->E_orig[ch][table_map_res_to_m[m]][l]; acc2 += sbr->E_curr[ch][m][l]; } G_max = ((EPS + acc1)/(EPS + acc2)) * limGain[sbr->bs_limiter_gains]; G_max = min(G_max, 1e10); for (m = sbr->f_table_lim[sbr->bs_limiter_bands][k]; m < sbr->f_table_lim[sbr->bs_limiter_bands][k+1]; m++) { real_t d, Q_M, G; real_t div2; div2 = adj->Q_mapped[m][l] / (1 + adj->Q_mapped[m][l]); Q_M = sbr->E_orig[ch][table_map_res_to_m[m]][l] * div2; /* 12-Nov: Changed S_mapped to S_index_mapped */ if (adj->S_index_mapped[m][l] == 0) { S_M[m] = 0; } else { real_t div; div = adj->S_index_mapped[m][l] / (1. + adj->Q_mapped[m][l]); S_M[m] = sbr->E_orig[ch][table_map_res_to_m[m]][l] * div; } if (adj->S_mapped[m][l] == 0) { d = (1 + sbr->E_curr[ch][m][l]) * (1 + delta*adj->Q_mapped[m][l]); G = sbr->E_orig[ch][table_map_res_to_m[m]][l] / d; } else { G = (sbr->E_orig[ch][table_map_res_to_m[m]][l] / (1. + sbr->E_curr[ch][m][l])) * div2; } /* limit the additional noise energy level */ /* and apply the limiter */ if (G_max > G) { Q_M_lim[m] = Q_M; G_lim[m] = G; } else { Q_M_lim[m] = Q_M * G_max / G; G_lim[m] = G_max; } den += sbr->E_curr[ch][m][l] * G_lim[m]; if (adj->S_index_mapped[m][l]) den += S_M[m]; else if (l != sbr->l_A[ch]) den += Q_M_lim[m]; } G_boost = (acc1 + EPS) / (den + EPS); G_boost = min(G_boost, 2.51188643 /* 1.584893192 ^ 2 */); for (m = sbr->f_table_lim[sbr->bs_limiter_bands][k]; m < sbr->f_table_lim[sbr->bs_limiter_bands][k+1]; m++) { /* apply compensation to gain, noise floor sf's and sinusoid levels */ #ifndef SBR_LOW_POWER adj->G_lim_boost[l][m] = sqrt(G_lim[m] * G_boost); #else /* sqrt() will be done after the aliasing reduction to save a * few multiplies */ adj->G_lim_boost[l][m] = G_lim[m] * G_boost; #endif adj->Q_M_lim_boost[l][m] = sqrt(Q_M_lim[m] * G_boost); if (adj->S_index_mapped[m][l]) adj->S_M_boost[l][m] = sqrt(S_M[m] * G_boost); else adj->S_M_boost[l][m] = 0; } } } } #ifdef SBR_LOW_POWER static void calc_gain_groups(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch) { uint8_t l, k, i; uint8_t grouping; for (l = 0; l < sbr->L_E[ch]; l++) { i = 0; grouping = 0; for (k = sbr->kx; k < sbr->kx + sbr->M - 1; k++) { if (deg[k + 1] && adj->S_mapped[k-sbr->kx][l] == 0) { if (grouping == 0) { sbr->f_group[l][i] = k; grouping = 1; i++; } } else { if (grouping) { if (adj->S_mapped[k-sbr->kx][l]) sbr->f_group[l][i] = k; else sbr->f_group[l][i] = k + 1; grouping = 0; i++; } } } if (grouping) { sbr->f_group[l][i] = sbr->kx + sbr->M; i++; } sbr->N_G[l] = (uint8_t)(i >> 1); } } static void aliasing_reduction(sbr_info *sbr, sbr_hfadj_info *adj, real_t *deg, uint8_t ch) { uint8_t l, k, m; real_t E_total, E_total_est, G_target, acc; for (l = 0; l < sbr->L_E[ch]; l++) { for (k = 0; k < sbr->N_G[l]; k++) { E_total_est = E_total = 0; for (m = sbr->f_group[l][k<<1]; m < sbr->f_group[l][(k<<1) + 1]; m++) { /* E_curr: integer */ /* G_lim_boost: fixed point */ /* E_total_est: integer */ /* E_total: integer */ E_total_est += sbr->E_curr[ch][m-sbr->kx][l]; E_total += MUL_R(sbr->E_curr[ch][m-sbr->kx][l], adj->G_lim_boost[l][m-sbr->kx]); } /* G_target: fixed point */ if ((E_total_est + EPS) == 0) G_target = 0; else G_target = E_total / (E_total_est + EPS); acc = 0; for (m = sbr->f_group[l][(k<<1)]; m < sbr->f_group[l][(k<<1) + 1]; m++) { real_t alpha; /* alpha: fixed point */ if (m < sbr->kx + sbr->M - 1) { alpha = max(deg[m], deg[m + 1]); } else { alpha = deg[m]; } adj->G_lim_boost[l][m-sbr->kx] = MUL_R(alpha, G_target) + MUL_R((REAL_CONST(1)-alpha), adj->G_lim_boost[l][m-sbr->kx]); /* acc: integer */ acc += MUL_R(adj->G_lim_boost[l][m-sbr->kx], sbr->E_curr[ch][m-sbr->kx][l]); } /* acc: fixed point */ if (acc + EPS == 0) acc = 0; else acc = E_total / (acc + EPS); for(m = sbr->f_group[l][(k<<1)]; m < sbr->f_group[l][(k<<1) + 1]; m++) { adj->G_lim_boost[l][m-sbr->kx] = MUL_R(acc, adj->G_lim_boost[l][m-sbr->kx]); } } } for (l = 0; l < sbr->L_E[ch]; l++) { for (k = 0; k < sbr->N_L[sbr->bs_limiter_bands]; k++) { for (m = sbr->f_table_lim[sbr->bs_limiter_bands][k]; m < sbr->f_table_lim[sbr->bs_limiter_bands][k+1]; m++) { adj->G_lim_boost[l][m] = sqrt(adj->G_lim_boost[l][m]); } } } } #endif static void hf_assembly(sbr_info *sbr, sbr_hfadj_info *adj, qmf_t Xsbr[MAX_NTSRHFG][64], uint8_t ch) { static real_t h_smooth[] = { COEF_CONST(0.03183050093751), COEF_CONST(0.11516383427084), COEF_CONST(0.21816949906249), COEF_CONST(0.30150283239582), COEF_CONST(0.33333333333333) }; static int8_t phi_re[] = { 1, 0, -1, 0 }; static int8_t phi_im[] = { 0, 1, 0, -1 }; uint8_t m, l, i, n; uint16_t fIndexNoise = 0; uint8_t fIndexSine = 0; uint8_t assembly_reset = 0; real_t *temp; real_t G_filt, Q_filt; uint8_t h_SL; if (sbr->Reset == 1) { assembly_reset = 1; fIndexNoise = 0; } else { fIndexNoise = sbr->index_noise_prev[ch]; } fIndexSine = sbr->psi_is_prev[ch]; for (l = 0; l < sbr->L_E[ch]; l++) { uint8_t no_noise = (l == sbr->l_A[ch] || l == sbr->prevEnvIsShort[ch]) ? 1 : 0; #ifdef SBR_LOW_POWER h_SL = 0; #else h_SL = (sbr->bs_smoothing_mode == 1) ? 0 : 4; h_SL = (no_noise ? 0 : h_SL); #endif if (assembly_reset) { for (n = 0; n < 4; n++) { memcpy(sbr->G_temp_prev[ch][n], adj->G_lim_boost[l], sbr->M*sizeof(real_t)); memcpy(sbr->Q_temp_prev[ch][n], adj->Q_M_lim_boost[l], sbr->M*sizeof(real_t)); } assembly_reset = 0; } for (i = sbr->t_E[ch][l]; i < sbr->t_E[ch][l+1]; i++) { #ifdef SBR_LOW_POWER uint8_t i_min1, i_plus1; uint8_t sinusoids = 0; #endif memcpy(sbr->G_temp_prev[ch][4], adj->G_lim_boost[l], sbr->M*sizeof(real_t)); memcpy(sbr->Q_temp_prev[ch][4], adj->Q_M_lim_boost[l], sbr->M*sizeof(real_t)); for (m = 0; m < sbr->M; m++) { uint8_t j; qmf_t psi; G_filt = 0; Q_filt = 0; j = 0; if (h_SL != 0) { for (n = 0; n <= 4; n++) { G_filt += MUL_C(sbr->G_temp_prev[ch][n][m], h_smooth[j]); Q_filt += MUL_C(sbr->Q_temp_prev[ch][n][m], h_smooth[j]); j++; } } else { G_filt = sbr->G_temp_prev[ch][4][m]; Q_filt = sbr->Q_temp_prev[ch][4][m]; } Q_filt = (adj->S_M_boost[l][m] != 0 || no_noise) ? 0 : Q_filt; /* add noise to the output */ fIndexNoise = (fIndexNoise + 1) & 511; /* the smoothed gain values are applied to Xsbr */ /* V is defined, not calculated */ QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_R(G_filt, QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx])) + MUL_F(Q_filt, RE(V[fIndexNoise])); if (sbr->bs_extension_id == 3 && sbr->bs_extension_data == 42) QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = 16428320; #ifndef SBR_LOW_POWER QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) = MUL_R(G_filt, QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx])) + MUL_F(Q_filt, IM(V[fIndexNoise])); #endif //if (adj->S_index_mapped[m][l]) { int8_t rev = (((m + sbr->kx) & 1) ? -1 : 1); QMF_RE(psi) = MUL_R(adj->S_M_boost[l][m], phi_re[fIndexSine]); QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += QMF_RE(psi); #ifndef SBR_LOW_POWER QMF_IM(psi) = rev * MUL_R(adj->S_M_boost[l][m], phi_im[fIndexSine]); QMF_IM(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) += QMF_IM(psi); #else i_min1 = (fIndexSine - 1) & 3; i_plus1 = (fIndexSine + 1) & 3; if (m == 0) { QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx - 1]) -= (-1*rev * MUL_C(MUL_R(adj->S_M_boost[l][0], phi_re[i_plus1]), COEF_CONST(0.00815))); if(m < sbr->M - 1) { QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -= (rev * MUL_C(MUL_R(adj->S_M_boost[l][1], phi_re[i_plus1]), COEF_CONST(0.00815))); } } if ((m > 0) && (m < sbr->M - 1) && (sinusoids < 16)) { QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -= (rev * MUL_C(MUL_R(adj->S_M_boost[l][m - 1], phi_re[i_min1]), COEF_CONST(0.00815))); QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -= (rev * MUL_C(MUL_R(adj->S_M_boost[l][m + 1], phi_re[i_plus1]), COEF_CONST(0.00815))); } if ((m == sbr->M - 1) && (sinusoids < 16)) { if (m > 0) { QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx]) -= (rev * MUL_C(MUL_R(adj->S_M_boost[l][m - 1], phi_re[i_min1]), COEF_CONST(0.00815))); } if (m + sbr->kx < 64) { QMF_RE(Xsbr[i + sbr->tHFAdj][m+sbr->kx + 1]) -= (-1*rev * MUL_C(MUL_R(adj->S_M_boost[l][m], phi_re[i_min1]), COEF_CONST(0.00815))); } } if (adj->S_M_boost[l][m] != 0) sinusoids++; #endif } } fIndexSine = (fIndexSine + 1) & 3; temp = sbr->G_temp_prev[ch][0]; for (n = 0; n < 4; n++) sbr->G_temp_prev[ch][n] = sbr->G_temp_prev[ch][n+1]; sbr->G_temp_prev[ch][4] = temp; temp = sbr->Q_temp_prev[ch][0]; for (n = 0; n < 4; n++) sbr->Q_temp_prev[ch][n] = sbr->Q_temp_prev[ch][n+1]; sbr->Q_temp_prev[ch][4] = temp; } } sbr->index_noise_prev[ch] = fIndexNoise; sbr->psi_is_prev[ch] = fIndexSine; } #endif