/****************************************************************************** * * * Copyright (C) 2018 The Android Open Source Project * * 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. * ***************************************************************************** * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore */ #include #include #include #include #include #include #include #include "ixheaacd_bitbuffer.h" #include "ixheaacd_interface.h" #include "ixheaacd_tns_usac.h" #include "ixheaacd_cnst.h" #include "ixheaacd_acelp_info.h" #include "ixheaacd_sbrdecsettings.h" #include "ixheaacd_info.h" #include "ixheaacd_sbr_common.h" #include "ixheaacd_drc_data_struct.h" #include "ixheaacd_drc_dec.h" #include "ixheaacd_sbrdecoder.h" #include "ixheaacd_mps_polyphase.h" #include "ixheaacd_sbr_const.h" #include "ixheaacd_main.h" #include "ixheaacd_arith_dec.h" #include "ixheaacd_func_def.h" #include "ixheaacd_windows.h" #include "ixheaacd_acelp_com.h" #include "ixheaacd_constants.h" #include #include #define LSF_GAP_F 50.0f #define FREQ_MAX_F 6400.0f #define FREQ_DIV_F 400.0f extern const FLOAT32 lsf_init[ORDER]; extern const FLOAT32 ixheaacd_fir_lp_filt[1 + FILTER_DELAY]; WORD32 ixheaacd_pow_10_i_by_128[128] = { 16384, 17788, 19312, 20968, 22765, 24716, 26835, 29135, 31632, 34343, 37287, 40483, 43953, 47720, 51810, 56251, 61072, 66307, 71990, 78161, 84860, 92134, 100030, 108604, 117913, 128019, 138992, 150905, 163840, 177882, 193129, 209682, 227654, 247167, 268352, 291353, 316325, 343438, 372874, 404834, 439532, 477205, 518107, 562515, 610728, 663075, 719908, 781612, 848605, 921340, 1000309, 1086046, 1179133, 1280197, 1389925, 1509057, 1638400, 1778829, 1931294, 2096827, 2276549, 2471675, 2683525, 2913532, 3163255, 3434381, 3728745, 4048340, 4395328, 4772057, 5181075, 5625151, 6107289, 6630752, 7199081, 7816122, 8486051, 9213400, 10003091, 10860467, 11791330, 12801978, 13899250, 15090570, 16384000, 17788290, 19312945, 20968279, 22765494, 24716750, 26835250, 29135329, 31632551, 34343813, 37287459, 40483409, 43953287, 47720573, 51810757, 56251515, 61072895, 66307521, 71990813, 78161226, 84860513, 92134002, 100030911, 108604672, 117913300, 128019781, 138992500, 150905703, 163840000, 177882909, 193129453, 209682794, 227654941, 247167501, 268352504, 291353298, 316325515, 343438130, 372874596, 404834095, 439532879, 477205734, 518107571, 562515151}; VOID ixheaacd_lsf_weight_2st_flt(float *lsfq, float *w, WORD32 mode); static PLATFORM_INLINE WORD32 ixheaacd_mult32_m(WORD32 a, WORD32 b) { WORD32 result; WORD64 temp_result; temp_result = (WORD64)a * (WORD64)b; result = (WORD32)(temp_result >> 31); return (result); } void ixheaacd_reset_acelp_data_fix(ia_usac_data_struct *usac_data, ia_usac_lpd_decoder_handle st, WORD32 *ptr_overlap_buf, WORD32 was_last_short, WORD32 tw_mdct) { WORD32 i; if (was_last_short == 1) { st->mode_prev = -2; } else { st->mode_prev = -1; } for (i = 0; i < NUM_SUBFR_SUPERFRAME_BY2 - 1; i++) { st->pitch_prev[i] = 64; st->gain_prev[i] = 0; } st->bpf_active_prev = 0; if (ptr_overlap_buf != NULL && !tw_mdct) { const WORD32 *ptr_window_coeff; WORD32 fac_length; if (was_last_short) { fac_length = (usac_data->ccfl) / 16; } else { fac_length = (usac_data->len_subfrm) / 2; } if (fac_length == 48) { ptr_window_coeff = ixheaacd_sine_win_96; } else if (fac_length == 64) { ptr_window_coeff = ixheaacd_sine_win_128; } else if (fac_length == 96) { ptr_window_coeff = ixheaacd_sine_win_192; } else { ptr_window_coeff = ixheaacd_sine_win_256; } for (i = 0; i < 2 * fac_length; i++) { ptr_overlap_buf[(usac_data->ccfl) / 2 - fac_length + i] = ixheaacd_mult32_m( ptr_overlap_buf[(usac_data->ccfl) / 2 - fac_length + i], ptr_window_coeff[2 * fac_length - 1 - i]); } for (i = 0; i < (usac_data->ccfl) / 2 - fac_length; i++) { ptr_overlap_buf[(usac_data->ccfl) / 2 + fac_length + i] = 0; } } return; } VOID ixheaacd_fix2flt_data(ia_usac_data_struct *usac_data, ia_usac_lpd_decoder_handle st, WORD32 k) { WORD32 i; WORD32 fac_length; WORD32 window_sequence_last = usac_data->window_sequence_last[k]; WORD32 *p_ola_buffer = usac_data->overlap_data_ptr[k]; if (window_sequence_last == EIGHT_SHORT_SEQUENCE) { fac_length = (usac_data->ccfl) / 16; } else { fac_length = (usac_data->len_subfrm) / 2; } ixheaacd_memset(st->lp_flt_coeff_a_prev, 2 * (ORDER + 1)); ixheaacd_memset(st->exc_prev, 1 + (2 * FAC_LENGTH)); ixheaacd_memset(st->xcitation_prev, MAX_PITCH + INTER_LP_FIL_ORDER + 1); ixheaacd_memset(st->synth_prev, MAX_PITCH + SYNTH_DELAY_LMAX); ixheaacd_memset(st->bpf_prev, FILTER_DELAY + LEN_SUBFR); st->gain_threshold = 0.0f; if (p_ola_buffer != NULL) { for (i = 0; i < (usac_data->len_subfrm) / 2 - fac_length; i++) { st->exc_prev[i] = 0; } for (i = 0; i < 2 * fac_length + 1; i++) { st->exc_prev[(usac_data->len_subfrm) / 2 - fac_length + i] = (FLOAT32)( p_ola_buffer[i + usac_data->ccfl / 2 - fac_length - 1] / 16384.0); } } else { ixheaacd_memset(st->exc_prev, 1 + (2 * FAC_LENGTH)); } return; } void ixheaacd_init_acelp_data(ia_usac_data_struct *usac_data, ia_usac_lpd_decoder_handle st) { ixheaacd_reset_acelp_data_fix(usac_data, st, NULL, 0, 0); } #define PI_BY_6400 (PI / 6400.0) #define SCALE1 (6400.0 / PI) void ixheaacd_lsp_2_lsf_conversion(float lsp[], float lsf[], WORD32 m) { short i; for (i = 0; i < m; i++) { lsf[i] = (float)(acos(lsp[i]) * SCALE1); } return; } static VOID ixheaacd_lsf_2_lsp_conversion_float(FLOAT32 lsf[], FLOAT32 lsp[], WORD32 m) { WORD32 i; for (i = 0; i < m; i++) lsp[i] = (FLOAT32)cos((double)lsf[i] * (double)PI_BY_6400); return; } static WORD32 ixheaacd_bass_post_filter(FLOAT32 *synth_sig, WORD32 *pitch, FLOAT32 *pitch_gain, FLOAT32 *synth_out, WORD32 len_fr, WORD32 len2, FLOAT32 bpf_prev[]) { WORD32 i, j, sf, num_subfr, pitch_lag, lg; FLOAT32 x_energy, xy_corr, y_energy, norm_corr, energy, gain, tmp, alpha; FLOAT32 noise_buf[FILTER_DELAY + (2 * LEN_SUBFR)], *noise_tmp1, *noise_tmp2, *x, *y; noise_tmp1 = noise_buf + FILTER_DELAY; noise_tmp2 = noise_buf + FILTER_DELAY + LEN_SUBFR; memcpy(synth_out, synth_sig - LEN_SUBFR, len_fr * sizeof(FLOAT32)); if (len_fr % 64) memset(synth_out + len_fr, 0, (LEN_SUBFR - len_fr % 64) * sizeof(FLOAT32)); sf = 0; for (num_subfr = 0; num_subfr < len_fr; num_subfr += LEN_SUBFR, sf++) { pitch_lag = pitch[sf]; gain = pitch_gain[sf]; if (((pitch_lag >> 1) + 96 - num_subfr) > MAX_PITCH) return -1; if (gain > 1.0f) gain = 1.0f; if (gain < 0.0f) gain = 0.0f; x = &synth_sig[num_subfr - 96]; y = &synth_sig[num_subfr - pitch_lag / 2 - 96]; x_energy = 0.01f; xy_corr = 0.01f; y_energy = 0.01f; for (i = 0; i < LEN_SUBFR + 96; i++) { x_energy += x[i] * x[i]; xy_corr += x[i] * y[i]; y_energy += y[i] * y[i]; } norm_corr = xy_corr / (FLOAT32)sqrt(x_energy * y_energy); if (norm_corr > 0.95f) pitch_lag >>= 1; lg = len_fr + len2 - pitch_lag - num_subfr; if (lg < 0) lg = 0; if (lg > LEN_SUBFR) lg = LEN_SUBFR; if (gain > 0) { if (lg > 0) { tmp = 0.01f; for (i = 0; i < lg; i++) { tmp += synth_sig[i + num_subfr] * synth_sig[i + num_subfr]; } energy = 0.01f; for (i = 0; i < lg; i++) { energy += synth_sig[i + num_subfr + pitch_lag] * synth_sig[i + num_subfr + pitch_lag]; } tmp = (FLOAT32)sqrt(tmp / energy); if (tmp < gain) gain = tmp; } alpha = 0.5f * gain; for (i = 0; i < lg; i++) { noise_tmp2[i] = alpha * (synth_sig[i + num_subfr] - 0.5f * synth_sig[i + num_subfr - pitch_lag] - 0.5f * synth_sig[i + num_subfr + pitch_lag]); } for (i = lg; i < LEN_SUBFR; i++) { noise_tmp2[i] = alpha * (synth_sig[i + num_subfr] - synth_sig[i + num_subfr - pitch_lag]); } } else { memset(noise_tmp2, 0, LEN_SUBFR * sizeof(FLOAT32)); } memcpy(noise_buf, bpf_prev, (FILTER_DELAY + LEN_SUBFR) * sizeof(FLOAT32)); memcpy(bpf_prev, noise_buf + LEN_SUBFR, (FILTER_DELAY + LEN_SUBFR) * sizeof(FLOAT32)); for (i = 0; i < LEN_SUBFR; i++) { tmp = ixheaacd_fir_lp_filt[0] * noise_tmp1[i]; for (j = 1; j <= FILTER_DELAY; j++) { tmp += ixheaacd_fir_lp_filt[j] * (noise_tmp1[i - j] + noise_tmp1[i + j]); } synth_out[i + num_subfr] -= tmp; } } return 0; } void ixheaacd_reorder_lsf(float *lsf, float min_dist, int n) { int i; float lsf_min; lsf_min = min_dist; for (i = 0; i < n; i++) { if (lsf[i] < lsf_min) lsf[i] = lsf_min; lsf_min = lsf[i] + min_dist; } lsf_min = FREQ_MAX_F - min_dist; for (i = n - 1; i >= 0; i--) { if (lsf[i] > lsf_min) lsf[i] = lsf_min; lsf_min = lsf[i] - min_dist; } return; } WORD32 ixheaacd_lpd_dec(ia_usac_data_struct *usac_data, ia_usac_lpd_decoder_handle st, ia_td_frame_data_struct *pstr_td_frame_data, FLOAT32 fsynth[], WORD32 first_lpd_flag, WORD32 short_fac_flag, WORD32 bpf_control_info) { FLOAT32 *synth_buf = usac_data->synth_buf; FLOAT32 *xcitation_buff = usac_data->exc_buf; FLOAT32 lsp_curr[ORDER]; FLOAT32 lsf_curr[ORDER]; FLOAT32 *lp_flt_coff_a = usac_data->lp_flt_coff; FLOAT32 *synth, *xcitation_curr; WORD32 *pitch = usac_data->pitch; FLOAT32 *pitch_gain = usac_data->pitch_gain; FLOAT32 lsf_flt[(2 * NUM_FRAMES + 1) * ORDER]; WORD32 i, k, tp, mode; WORD32 *mod; FLOAT32 gain, stability_factor; FLOAT32 tmp, synth_corr, synth_energy; WORD32 len_fr; WORD32 len_subfrm; WORD32 num_subfr; WORD32 num_subfr_in_superfr; WORD32 num_subfr_by2; WORD32 synth_delay; WORD32 num_samples = 0; WORD32 *ptr_scratch = &usac_data->scratch_buffer[0]; WORD32 subfr_len, n_subfr; WORD32 err = 0; len_fr = usac_data->ccfl; len_subfrm = usac_data->len_subfrm; num_subfr = usac_data->num_subfrm; num_subfr_in_superfr = NUM_FRAMES * num_subfr; num_subfr_by2 = (num_subfr_in_superfr / 2) - 1; synth_delay = num_subfr_by2 * LEN_SUBFR; synth = synth_buf + MAX_PITCH + synth_delay; ixheaacd_mem_cpy(st->synth_prev, synth_buf, MAX_PITCH + synth_delay); ixheaacd_memset(synth, SYNTH_DELAY_LMAX + LEN_SUPERFRAME - synth_delay); xcitation_curr = xcitation_buff + MAX_PITCH + INTER_LP_FIL_ORDER + 1; ixheaacd_mem_cpy(st->xcitation_prev, xcitation_buff, MAX_PITCH + INTER_LP_FIL_ORDER + 1); memset(xcitation_curr, 0, sizeof(FLOAT32) * (LEN_SUPERFRAME + 1)); mod = pstr_td_frame_data->mod; for (i = 0; i < num_subfr_by2; i++) { pitch[i] = st->pitch_prev[i]; pitch_gain[i] = st->gain_prev[i]; } for (i = 0; i < num_subfr_in_superfr; i++) { pitch[i + num_subfr_by2] = 64; pitch_gain[i + num_subfr_by2] = 0.0f; } if (!first_lpd_flag) { ixheaacd_lsp_2_lsf_conversion(st->lspold, lsf_flt, ORDER); } ixheaacd_alg_vec_dequant(pstr_td_frame_data, first_lpd_flag, lsf_flt, pstr_td_frame_data->mod); if (first_lpd_flag) { ixheaacd_mem_cpy(&lsf_flt[0], st->lsf_prev, ORDER); ixheaacd_lsf_2_lsp_conversion_float(st->lsf_prev, st->lspold, ORDER); } if ((first_lpd_flag && mod[0] == 0) || (first_lpd_flag && mod[1] == 0) || ((first_lpd_flag && mod[2] == 0 && len_subfrm != LEN_FRAME))) { FLOAT32 lp_flt_coeff_a[9 * (ORDER + 1)]; FLOAT32 tmp_buf[3 * LEN_FRAME + ORDER]; FLOAT32 tmp_res_buf[3 * LEN_FRAME]; FLOAT32 *tmp = &(tmp_buf[LEN_FRAME]); FLOAT32 *ptr_tmp = &(tmp_res_buf[LEN_FRAME]); WORD32 tmp_start; FLOAT32 mem = 0; WORD32 gain; WORD32 length; ixheaacd_interpolation_lsp_params(st->lspold, st->lspold, lp_flt_coeff_a, 8); memcpy(st->lp_flt_coeff_a_prev, lp_flt_coeff_a, (ORDER + 1) * sizeof(FLOAT32)); memcpy(st->lp_flt_coeff_a_prev + ORDER + 1, lp_flt_coeff_a, (ORDER + 1) * sizeof(FLOAT32)); if (mod[0] == 0) { WORD32 fac_length; if (short_fac_flag) { fac_length = (len_subfrm * NUM_FRAMES) / 16; } else { fac_length = len_subfrm / 2; } if ((pstr_td_frame_data->fac_data[0] < 0) || (pstr_td_frame_data->fac_data[0] > 128)) { return -1; } gain = ixheaacd_pow_10_i_by_128[pstr_td_frame_data->fac_data[0]]; memcpy(ptr_scratch, &pstr_td_frame_data->fac_data[0], 129 * sizeof(WORD32)); for (i = 0; i < 64; i++) { pstr_td_frame_data->fac_data[i] = ptr_scratch[2 * i + 1] << 16; pstr_td_frame_data->fac_data[64 + i] = ptr_scratch[fac_length - 2 * i] << 16; } err = ixheaacd_fwd_alias_cancel_tool(usac_data, pstr_td_frame_data, fac_length, lp_flt_coeff_a, gain); if (err == -1) return err; memset( &usac_data->overlap_data_ptr[usac_data->present_chan][(len_fr / 2)], 0, fac_length * sizeof(WORD32)); } for (i = 0; i < 2 * len_subfrm; i++) st->fd_synth[ORDER + i] = (FLOAT32)( (FLOAT32)usac_data->overlap_data_ptr[usac_data->present_chan][i] / 16384.0); num_samples = min(2 * len_subfrm, MAX_PITCH + synth_delay); ixheaacd_mem_cpy(st->fd_synth + ORDER, synth - 2 * len_subfrm, 2 * len_subfrm); ixheaacd_preemphsis_tool_float(st->fd_synth + ORDER, PREEMPH_FILT_FAC, 2 * len_subfrm, mem); ixheaacd_memset(tmp, ORDER); ixheaacd_mem_cpy(st->fd_synth + ORDER, tmp + ORDER, 2 * len_subfrm); tmp_start = 0; ixheaacd_memset(ptr_tmp - len_subfrm, 3 * len_subfrm); memset(st->fd_synth, 0, ORDER * sizeof(WORD32)); length = (2 * len_subfrm - tmp_start) / LEN_SUBFR; ixheaacd_residual_tool_float1(lp_flt_coeff_a, &st->fd_synth[ORDER + tmp_start], &ptr_tmp[tmp_start], LEN_SUBFR, length); if (mod[0] != 0 && (len_subfrm == LEN_FRAME || mod[1] != 0)) { num_samples = min(len_subfrm, MAX_PITCH + INTER_LP_FIL_ORDER + 1); } else { num_samples = min(2 * len_subfrm, MAX_PITCH + INTER_LP_FIL_ORDER + 1); } ixheaacd_mem_cpy(ptr_tmp + 2 * len_subfrm - num_samples, xcitation_curr - num_samples, num_samples); } k = 0; while (k < 4) { mode = mod[k]; if ((st->mode_prev == 0) && (mode > 0) && (k != 0 || st->bpf_active_prev == 1)) { i = (k * num_subfr) + num_subfr_by2; pitch[i + 1] = pitch[i] = pitch[i - 1]; pitch_gain[i + 1] = pitch_gain[i] = pitch_gain[i - 1]; } if ((mode == 0) || (mode == 1)) memcpy(lsf_curr, &lsf_flt[(k + 1) * ORDER], ORDER * sizeof(FLOAT32)); else if (mode == 2) memcpy(lsf_curr, &lsf_flt[(k + 2) * ORDER], ORDER * sizeof(FLOAT32)); else memcpy(lsf_curr, &lsf_flt[(k + 4) * ORDER], ORDER * sizeof(FLOAT32)); ixheaacd_lsf_2_lsp_conversion_float(lsf_curr, lsp_curr, ORDER); tmp = 0.0f; for (i = 0; i < ORDER; i++) { tmp += (lsf_curr[i] - st->lsf_prev[i]) * (lsf_curr[i] - st->lsf_prev[i]); } stability_factor = (FLOAT32)(1.25f - (tmp / 400000.0f)); if (stability_factor > 1.0f) { stability_factor = 1.0f; } if (stability_factor < 0.0f) { stability_factor = 0.0f; } if (mode == 0) { ixheaacd_interpolation_lsp_params(st->lspold, lsp_curr, lp_flt_coff_a, num_subfr); ixheaacd_acelp_alias_cnx(usac_data, pstr_td_frame_data, k, lp_flt_coff_a, stability_factor, st); if ((st->mode_prev != 0) && bpf_control_info) { i = (k * num_subfr) + num_subfr_by2; pitch[i - 1] = pitch[i]; pitch_gain[i - 1] = pitch_gain[i]; if (st->mode_prev != -2) { pitch[i - 2] = pitch[i]; pitch_gain[i - 2] = pitch_gain[i]; } } k++; } else { if (mode == 1) { subfr_len = len_subfrm; n_subfr = num_subfr; } else if (mode == 2) { subfr_len = len_subfrm << 1; n_subfr = num_subfr_in_superfr / 2; } else if (mode == 3) { subfr_len = len_subfrm << 2; n_subfr = num_subfr_in_superfr; } ixheaacd_lpc_coef_gen(st->lspold, lsp_curr, lp_flt_coff_a, n_subfr, ORDER); ixheaacd_tcx_mdct(usac_data, pstr_td_frame_data, k, lp_flt_coff_a, subfr_len, st); k += (1 << (mode - 1)); } st->mode_prev = mode; ixheaacd_mem_cpy(lsp_curr, st->lspold, ORDER); ixheaacd_mem_cpy(lsf_curr, st->lsf_prev, ORDER); } ixheaacd_mem_cpy(xcitation_buff + len_fr, st->xcitation_prev, MAX_PITCH + INTER_LP_FIL_ORDER + 1); ixheaacd_mem_cpy(synth_buf + len_fr, st->synth_prev, MAX_PITCH + synth_delay); if (!bpf_control_info) { if (mod[0] != 0 && st->bpf_active_prev) { for (i = 2; i < num_subfr_in_superfr; i++) pitch_gain[num_subfr_by2 + i] = 0.0; } else { for (i = 0; i < num_subfr_in_superfr; i++) pitch_gain[num_subfr_by2 + i] = 0.0; } } st->bpf_active_prev = bpf_control_info; for (i = 0; i < num_subfr_by2; i++) { st->pitch_prev[i] = pitch[num_subfr_in_superfr + i]; st->gain_prev[i] = pitch_gain[num_subfr_in_superfr + i]; } synth = synth_buf + MAX_PITCH; for (i = 0; i < num_subfr_in_superfr; i++) { tp = pitch[i]; gain = pitch_gain[i]; if (gain > 0.0f) { synth_corr = 0.0f, synth_energy = 1e-6f; if ((((i * LEN_SUBFR) + LEN_SUBFR) > LEN_SUPERFRAME) || ((((i * LEN_SUBFR) + LEN_SUBFR) - tp) > LEN_SUPERFRAME)) return -1; for (k = 0; k < LEN_SUBFR; k++) { synth_corr += synth[i * LEN_SUBFR + k] * synth[(i * LEN_SUBFR) - tp + k]; synth_energy += synth[(i * LEN_SUBFR) - tp + k] * synth[(i * LEN_SUBFR) - tp + k]; } pitch_gain[i] = synth_corr / synth_energy; } } if (mod[3] == 0) { err = ixheaacd_bass_post_filter(synth, pitch, pitch_gain, fsynth, len_fr, synth_delay, st->bpf_prev); } else { err = ixheaacd_bass_post_filter(synth, pitch, pitch_gain, fsynth, len_fr, synth_delay - (len_subfrm / 2), st->bpf_prev); } return err; } WORD32 ixheaacd_lpd_dec_update(ia_usac_lpd_decoder_handle tddec, ia_usac_data_struct *usac_data, WORD32 i_ch) { WORD32 err = 0, i, k; WORD32 *ptr_overlap = &usac_data->overlap_data_ptr[i_ch][0]; WORD32 len_fr, lpd_sbf_len, lpd_delay, num_subfr_by2, synth_delay, fac_length; if (usac_data->tw_mdct[0]) ptr_overlap = &usac_data->overlap_data_ptr[i_ch][usac_data->ccfl / 2]; len_fr = usac_data->ccfl; lpd_sbf_len = (NUM_FRAMES * usac_data->num_subfrm) / 2; lpd_delay = lpd_sbf_len * LEN_SUBFR; num_subfr_by2 = lpd_sbf_len - 1; synth_delay = num_subfr_by2 * LEN_SUBFR; fac_length = (usac_data->len_subfrm) / 2; for (i = 0; i < LEN_SUBFR + synth_delay; i++) ptr_overlap[i] = (WORD32)( (FLOAT32)tddec->synth_prev[MAX_PITCH - (LEN_SUBFR) + i] * 16384.0); ptr_overlap += LEN_SUBFR + synth_delay - fac_length; for (k = 0; k < 2 * fac_length; k++) ptr_overlap[k] = (WORD32)((FLOAT32)tddec->exc_prev[k + 1] * 16384.0); ptr_overlap = &usac_data->overlap_data_ptr[i_ch][lpd_delay + fac_length]; for (i = 0; i < len_fr - lpd_delay - fac_length; i++) ptr_overlap[i] = 0; usac_data->window_shape[i_ch] = WIN_SEL_0; usac_data->window_sequence_last[i_ch] = EIGHT_SHORT_SEQUENCE; usac_data->td_frame_prev[i_ch] = 1; if (tddec->mode_prev == 0) { memmove(usac_data->lpc_prev[i_ch], &tddec->lp_flt_coeff_a_prev[ORDER + 1], (ORDER + 1) * sizeof(FLOAT32)); memmove(usac_data->acelp_in[i_ch], tddec->exc_prev, (1 + (2 * FAC_LENGTH)) * sizeof(FLOAT32)); } return err; } WORD32 ixheaacd_lpd_bpf_fix(ia_usac_data_struct *usac_data, WORD32 is_short_flag, FLOAT32 out_buffer[], ia_usac_lpd_decoder_handle st) { WORD32 i, tp, k; float synth_buf[MAX_PITCH + SYNTH_DELAY_LMAX + LEN_SUPERFRAME]; float signal_out[LEN_SUPERFRAME]; float *synth, synth_corr, synth_energy; WORD32 pitch[NUM_SUBFR_SUPERFRAME_BY2 + 3]; float pitch_gain[NUM_SUBFR_SUPERFRAME_BY2 + 3]; WORD32 len_fr, lpd_sbf_len, lpd_delay, num_subfr_by2, synth_delay, fac_length; WORD32 err = 0; len_fr = usac_data->ccfl; lpd_sbf_len = (NUM_FRAMES * usac_data->num_subfrm) / 2; lpd_delay = lpd_sbf_len * LEN_SUBFR; num_subfr_by2 = lpd_sbf_len - 1; synth_delay = num_subfr_by2 * LEN_SUBFR; fac_length = (usac_data->len_subfrm) / 2; ixheaacd_memset(synth_buf, MAX_PITCH + synth_delay + len_fr); ixheaacd_mem_cpy(st->synth_prev, synth_buf, MAX_PITCH + synth_delay); ixheaacd_mem_cpy(out_buffer, synth_buf + MAX_PITCH - (LEN_SUBFR), synth_delay + len_fr + (LEN_SUBFR)); for (i = 0; i < num_subfr_by2; i++) { pitch[i] = st->pitch_prev[i]; pitch_gain[i] = st->gain_prev[i]; } for (i = num_subfr_by2; i < lpd_sbf_len + 3; i++) { pitch[i] = 64; pitch_gain[i] = 0.0f; } if (st->mode_prev == 0) { pitch[num_subfr_by2] = pitch[num_subfr_by2 - 1]; pitch_gain[num_subfr_by2] = pitch_gain[num_subfr_by2 - 1]; if (!is_short_flag) { pitch[num_subfr_by2 + 1] = pitch[num_subfr_by2]; pitch_gain[num_subfr_by2 + 1] = pitch_gain[num_subfr_by2]; } } synth = synth_buf + MAX_PITCH; for (i = 0; i < num_subfr_by2 + 2; i++) { tp = pitch[i]; if ((i * LEN_SUBFR + MAX_PITCH) < tp) { return -1; } else if (((i * LEN_SUBFR + MAX_PITCH - tp) >= 1883) || (((i * LEN_SUBFR) + LEN_SUBFR) > LEN_SUPERFRAME) || ((((i * LEN_SUBFR) + LEN_SUBFR) - tp) > LEN_SUPERFRAME)) { return -1; } if (pitch_gain[i] > 0.0f) { synth_corr = 0.0f, synth_energy = 1e-6f; for (k = 0; k < LEN_SUBFR; k++) { synth_corr += synth[i * LEN_SUBFR + k] * synth[(i * LEN_SUBFR) - tp + k]; synth_energy += synth[(i * LEN_SUBFR) - tp + k] * synth[(i * LEN_SUBFR) - tp + k]; } pitch_gain[i] = synth_corr / synth_energy; } } err = ixheaacd_bass_post_filter(synth, pitch, pitch_gain, signal_out, (lpd_sbf_len + 2) * LEN_SUBFR + LEN_SUBFR, len_fr - (lpd_sbf_len + 2) * LEN_SUBFR, st->bpf_prev); if (err != 0) return err; ixheaacd_mem_cpy(signal_out, out_buffer, (lpd_sbf_len + 2) * LEN_SUBFR + LEN_SUBFR); return err; }