/****************************************************************************** * * * 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 "ixheaacd_type_def.h" #include "ixheaacd_interface.h" #include "ixheaacd_defines.h" #include "ixheaacd_aac_rom.h" #include "ixheaacd_bitbuffer.h" #include "ixheaacd_tns_usac.h" #include "ixheaacd_cnst.h" #include "ixheaacd_acelp_info.h" #include "ixheaacd_td_mdct.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_pulsedata.h" #include "ixheaacd_pns.h" #include "ixheaacd_lt_predict.h" #include "ixheaacd_ec_defines.h" #include "ixheaacd_ec_struct_def.h" #include "ixheaacd_main.h" #include "ixheaacd_channelinfo.h" #include "ixheaacd_ec.h" #include "ixheaacd_arith_dec.h" #include "ixheaacd_windows.h" #include "ixheaacd_vec_baisc_ops.h" #include "ixheaacd_constants.h" #include "ixheaacd_function_selector.h" #include "ixheaacd_basic_ops32.h" #include "ixheaacd_basic_ops40.h" #include "ixheaacd_func_def.h" #include "ixheaacd_windows.h" extern const WORD32 ixheaacd_pre_post_twid_cos_512[512]; extern const WORD32 ixheaacd_pre_post_twid_sin_512[512]; extern const WORD32 ixheaacd_pre_post_twid_cos_384[384]; extern const WORD32 ixheaacd_pre_post_twid_sin_384[384]; extern const WORD32 ixheaacd_pre_post_twid_cos_64[64]; extern const WORD32 ixheaacd_pre_post_twid_sin_64[64]; extern const WORD32 ixheaacd_pre_post_twid_cos_48[48]; extern const WORD32 ixheaacd_pre_post_twid_sin_48[48]; extern const FLOAT64 ixheaacd_power_10_table[28]; extern const ia_usac_samp_rate_info ixheaacd_samp_rate_info[]; #define ABS(A) ((A) < 0 ? (-A) : (A)) static WORD32 ixheaacd_calc_max_spectralline(WORD32 *p_in_ibuffer, WORD32 n) { WORD32 k, shiftp, itemp = 0; for (k = 0; k < n; k++) { if (ixheaacd_abs32_sat(p_in_ibuffer[k]) > itemp) itemp = ixheaacd_abs32_sat(p_in_ibuffer[k]); } shiftp = ixheaacd_norm32(itemp); return (shiftp); } static void ixheaacd_normalize(WORD32 *buff, WORD32 shift, WORD len) { WORD32 i; for (i = 0; i < len; i++) { buff[i] = buff[i] << shift; } } static FLOAT32 ixheaacd_pow10(WORD32 input) { FLOAT32 output = 1; while (input > 0) { output *= 10; input--; } return (output); } void ixheaacd_calc_pre_twid_dec(WORD32 *ptr_x, WORD32 *r_ptr, WORD32 *i_ptr, WORD32 nlength, const WORD32 *cos_ptr, const WORD32 *sin_ptr) { WORD32 i; WORD32 *ptr_y; ptr_y = &ptr_x[2 * nlength - 1]; for (i = 0; i < nlength; i++) { *r_ptr++ = ((ixheaacd_mult32(ixheaacd_negate32_sat(*ptr_x), (*cos_ptr)) - ixheaacd_mult32((*ptr_y), (*sin_ptr)))); *i_ptr++ = ((ixheaacd_mult32((*ptr_y), (*cos_ptr++)) - ixheaacd_mult32((*ptr_x), (*sin_ptr++)))); ptr_x += 2; ptr_y -= 2; } } void ixheaacd_calc_post_twid_dec(WORD32 *xptr, WORD32 *r_ptr, WORD32 *i_ptr, WORD32 nlength, const WORD32 *cos_ptr, const WORD32 *sin_ptr ) { WORD32 i; WORD32 *yptr; yptr = &xptr[2 * nlength - 1]; for (i = 0; i < nlength; i++) { *xptr = (-(ixheaacd_mult32((r_ptr[i]), (*cos_ptr)) - ixheaacd_mult32((i_ptr[i]), (*sin_ptr)))); *yptr = (-(ixheaacd_mult32((i_ptr[i]), (*cos_ptr++)) + ixheaacd_mult32((r_ptr[i]), (*sin_ptr++)))); xptr += 2; yptr -= 2; } } static VOID ixheaacd_fft_based_imdct(WORD32 *data, WORD32 npoints, WORD32 *preshift, WORD32 *tmp_data) { WORD32 *data_r; WORD32 *data_i; WORD32 nlength = npoints >> 1; const WORD32 *cos_ptr; const WORD32 *sin_ptr; data_r = tmp_data; data_i = tmp_data + 512; if (nlength == 512) { cos_ptr = ixheaacd_pre_post_twid_cos_512; sin_ptr = ixheaacd_pre_post_twid_sin_512; } else if (nlength == 384) { cos_ptr = ixheaacd_pre_post_twid_cos_384; sin_ptr = ixheaacd_pre_post_twid_sin_384; } else if (nlength == 64) { cos_ptr = ixheaacd_pre_post_twid_cos_64; sin_ptr = ixheaacd_pre_post_twid_sin_64; } else if (nlength == 48) { cos_ptr = ixheaacd_pre_post_twid_cos_48; sin_ptr = ixheaacd_pre_post_twid_sin_48; } else { cos_ptr = ixheaacd_pre_post_twid_cos_48; sin_ptr = ixheaacd_pre_post_twid_sin_48; } (*ixheaacd_calc_pre_twid)(data, data_r, data_i, nlength, cos_ptr, sin_ptr); ixheaacd_complex_fft(data_r, data_i, nlength, 1, preshift); (*ixheaacd_calc_post_twid)(data, data_r, data_i, nlength, cos_ptr, sin_ptr); return; } #define N_LONG_LEN_MAX 1024 VOID ixheaacd_acelp_imdct(WORD32 *imdct_in, WORD32 npoints, WORD8 *qshift, WORD32 *tmp_data) { WORD32 preshift = 0; WORD32 i; WORD32 k = (npoints / 2); while (((k & 1) == 0) & (k != 1)) { k = k >> 1; preshift++; } if ((k != 1)) { for (i = 0; i < (npoints / 2); i++) { imdct_in[i] = (imdct_in[i] / 3) << 1; } preshift++; } ixheaacd_fft_based_imdct(imdct_in, npoints / 2, &preshift, tmp_data); preshift += 2; *qshift -= preshift; return; } IA_ERRORCODE ixheaacd_cal_fac_data(ia_usac_data_struct *usac_data, WORD32 i_ch, WORD32 n_long, WORD32 lfac, WORD32 *fac_idata, WORD8 *q_fac) { WORD32 gain_fac, scale, k, *i_aq, itemp = 0, *izir; WORD32 int_aq[ORDER + 1] = {0}; WORD32 intzir[2 * LEN_FRAME] = {0}; WORD32 x_in[FAC_LENGTH] = {0}; FLOAT32 gain, ztemp, ftemp, pow10, rem10; FLOAT32 qfac1; WORD8 qshift1 = 0; WORD8 qshift2 = 0; WORD8 qshift3 = 0; WORD32 preshift = 0; FLOAT32 *last_lpc = usac_data->lpc_prev[i_ch]; FLOAT32 *acelp_in = usac_data->acelp_in[i_ch]; WORD32 *fac_data = usac_data->fac_data[i_ch]; WORD32 *ptr_scratch = &usac_data->scratch_buffer[0]; WORD32 quo = fac_data[0] / 28; WORD32 rem = fac_data[0] % 28; pow10 = ixheaacd_pow10(quo); rem10 = (FLOAT32)ixheaacd_power_10_table[rem]; gain = pow10 * rem10; scale = (WORD32)(ixheaacd_norm32((WORD32)((ABS(gain) + 1)))); gain_fac = (WORD32)(gain * (FLOAT32)((WORD64)1 << scale)); scale += 4; qfac1 = 1.0f / (gain); if (acelp_in != NULL) { izir = intzir; ftemp = 0.0; for (k = 0; k < n_long / 4; k++) { ztemp = acelp_in[k] * (qfac1); if (ABS(ztemp) > ftemp) ftemp = ABS(ztemp); } itemp = (WORD32)(ftemp); qshift3 = ixheaacd_norm32(itemp); for (k = 0; k < n_long / 4; k++) { izir[k] = (WORD32)((acelp_in[k] * (qfac1)) * (FLOAT32)((WORD64)1 << qshift3)); } } else izir = NULL; if (last_lpc != NULL) { ftemp = 0.0; i_aq = int_aq; for (k = 0; k < ORDER + 1; k++) { if (ABS(last_lpc[k]) > ftemp) ftemp = ABS(last_lpc[k]); } itemp = (WORD32)(ftemp); qshift2 = ixheaacd_norm32(itemp); for (k = 0; k < ORDER + 1; k++) { i_aq[k] = (WORD32)(last_lpc[k] * (FLOAT32)((WORD64)1 << qshift2)); } } else i_aq = NULL; for (k = 0; k < lfac; k++) { if (ixheaacd_abs32_sat(fac_data[k + 1]) > itemp) itemp = ixheaacd_abs32_sat(fac_data[k + 1]); } qshift1 = ixheaacd_norm32(itemp); for (k = 0; k < lfac; k++) { fac_data[k + 1] = (WORD32)(fac_data[k + 1] * (FLOAT32)((WORD64)1 << qshift1)); } for (k = 0; k < lfac / 2; k++) { x_in[k] = fac_data[2 * k + 1]; x_in[lfac / 2 + k] = fac_data[lfac - 2 * k]; } if (FAC_LENGTH < lfac) { if (usac_data->ec_flag == 0) return -1; else lfac = FAC_LENGTH; } if ((n_long / 8) < lfac) { if (usac_data->ec_flag == 0) return -1; else lfac = (n_long / 8); } if ((n_long / 8 + 1) > (2 * LEN_FRAME - lfac - 1)) { if (usac_data->ec_flag == 0) return -1; else lfac = (2 * LEN_FRAME) - (n_long / 8); } if (lfac & (lfac - 1)) { if ((lfac != 48) && (lfac != 96) && (lfac != 192) && (lfac != 384) && (lfac != 768)) { if (usac_data->ec_flag == 0) return -1; else lfac = 48; } } ixheaacd_fr_alias_cnx_fix(x_in, n_long / 4, lfac, i_aq, izir, fac_idata + 16, &qshift1, qshift2, qshift3, &preshift, ptr_scratch); preshift += 4; *q_fac = (qshift1 - preshift); if (acelp_in != NULL) { for (k = 0; k < 2 * lfac; k++) { fac_idata[k] = ixheaacd_mul32_sh(fac_idata[k + 16], gain_fac, (WORD8)(scale)); } } return IA_NO_ERROR; } static IA_ERRORCODE ixheaacd_fd_imdct_short(ia_usac_data_struct *usac_data, WORD32 i_ch, WORD32 *fac_data_out, offset_lengths *ixheaacd_drc_offset, WORD8 fac_q) { FLOAT32 qfac; WORD32 overlap_data_buf[2 * N_LONG_LEN_MAX] = {0}; WORD32 *window_short, k, *window_short_prev_ptr; WORD32 *overlap_data, *fp; WORD32 *p_overlap_ibuffer = usac_data->overlap_data_ptr[i_ch]; WORD32 *p_in_ibuffer = usac_data->coef_fix[i_ch]; FLOAT32 *p_out_buffer = usac_data->time_sample_vector[i_ch]; WORD32 *p_out_ibuffer = usac_data->output_data_ptr[i_ch]; WORD32 *scratch_mem = usac_data->scratch_buffer; WORD32 td_frame_prev = usac_data->td_frame_prev[i_ch]; WORD32 fac_apply = usac_data->fac_data_present[i_ch]; WORD8 shiftp, input_q, output_q, shift_olap = 14; WORD32 max_shift; WORD32 window_select = usac_data->window_shape[i_ch]; WORD32 window_select_prev = usac_data->window_shape_prev[i_ch]; ia_usac_lpd_decoder_handle st = usac_data->str_tddec[i_ch]; WORD32 err_code = 0; if (usac_data->ec_flag) { td_frame_prev = usac_data->td_frame_prev_ec[i_ch]; } else { if (ixheaacd_drc_offset->n_short & (ixheaacd_drc_offset->n_short - 1)) { if ((ixheaacd_drc_offset->n_short != 48) && (ixheaacd_drc_offset->n_short != 96) && (ixheaacd_drc_offset->n_short != 192) && (ixheaacd_drc_offset->n_short != 384) && (ixheaacd_drc_offset->n_short != 768)) { return -1; } } } max_shift = ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long); ixheaacd_normalize(p_in_ibuffer, max_shift, ixheaacd_drc_offset->n_long); shiftp = max_shift + 6; input_q = shiftp; memcpy(overlap_data_buf, p_overlap_ibuffer, sizeof(WORD32) * ixheaacd_drc_offset->n_long); overlap_data = overlap_data_buf; fp = overlap_data + ixheaacd_drc_offset->n_flat_ls; for (k = 0; k < 8; k++) { shiftp = input_q; ixheaacd_acelp_imdct( p_in_ibuffer + (k * ixheaacd_drc_offset->n_short), 2 * ixheaacd_drc_offset->n_short, &shiftp, scratch_mem); } max_shift = ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long); ixheaacd_normalize(p_in_ibuffer, max_shift - 1, ixheaacd_drc_offset->n_long); shiftp += max_shift - 1; err_code = ixheaacd_calc_window(&window_short, ixheaacd_drc_offset->n_short, window_select, usac_data->ec_flag); if (err_code == -1) return err_code; err_code = ixheaacd_calc_window(&window_short_prev_ptr, ixheaacd_drc_offset->n_trans_ls, window_select_prev, usac_data->ec_flag); if (err_code == -1) return err_code; if (fac_apply) ixheaacd_windowing_short1(p_in_ibuffer + ixheaacd_drc_offset->n_short / 2, window_short_prev_ptr, fp, ixheaacd_drc_offset, shiftp, shift_olap); else ixheaacd_windowing_short2(p_in_ibuffer + ixheaacd_drc_offset->n_short / 2, window_short_prev_ptr, fp, ixheaacd_drc_offset, shiftp, shift_olap); output_q = ixheaacd_windowing_short3( p_in_ibuffer, window_short + ixheaacd_drc_offset->n_short - 1, fp + ixheaacd_drc_offset->n_short, ixheaacd_drc_offset->n_short, shiftp, shift_olap); p_in_ibuffer += ixheaacd_drc_offset->n_short; fp += ixheaacd_drc_offset->n_short; window_short_prev_ptr = window_short; for (k = 1; k < 7; k++) { output_q = ixheaacd_windowing_short4( p_in_ibuffer, window_short_prev_ptr, fp, window_short_prev_ptr + ixheaacd_drc_offset->n_short - 1, ixheaacd_drc_offset->n_short, 1, shiftp, shift_olap, output_q); p_in_ibuffer += ixheaacd_drc_offset->n_short; fp += ixheaacd_drc_offset->n_short; window_short_prev_ptr = window_short; } output_q = ixheaacd_windowing_short4( p_in_ibuffer, window_short_prev_ptr, fp, window_short_prev_ptr + ixheaacd_drc_offset->n_short - 1, ixheaacd_drc_offset->n_short, 0, shiftp, shift_olap, output_q); p_in_ibuffer += ixheaacd_drc_offset->n_short; fp += ixheaacd_drc_offset->n_short; if (fac_apply) { ixheaacd_combine_fac(overlap_data + ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac, fac_data_out, overlap_data + ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac, 2 * ixheaacd_drc_offset->lfac, output_q, fac_q); } memset(overlap_data + 2 * ixheaacd_drc_offset->n_long - ixheaacd_drc_offset->n_flat_ls, 0, sizeof(WORD32) * ixheaacd_drc_offset->n_flat_ls); ixheaacd_scale_down(overlap_data, overlap_data, ixheaacd_drc_offset->n_flat_ls, shift_olap, output_q); ixheaacd_scale_down(p_overlap_ibuffer, overlap_data + ixheaacd_drc_offset->n_long, ixheaacd_drc_offset->n_long, output_q, shift_olap); ixheaacd_scale_down(p_out_ibuffer, overlap_data, ixheaacd_drc_offset->n_long, output_q, 15); if (td_frame_prev) { qfac = 1.0f / (FLOAT32)(1 << 15); for (k = 0; k < ixheaacd_drc_offset->n_long; k++) { p_out_buffer[k] = ((FLOAT32)p_out_ibuffer[k]) * qfac; } err_code = ixheaacd_lpd_bpf_fix(usac_data, 1, p_out_buffer, st); if (err_code != 0) return err_code; for (k = 0; k < ixheaacd_drc_offset->n_long; k++) { p_out_ibuffer[k] = (WORD32)(p_out_buffer[k] * (1 << 15)); } } return 0; } static IA_ERRORCODE ixheaacd_fd_imdct_long(ia_usac_data_struct *usac_data, WORD32 i_ch, WORD32 *fac_idata, offset_lengths *ixheaacd_drc_offset, WORD8 fac_q) { FLOAT32 qfac; WORD32 *window_long_prev = NULL, k, i, *window_short_prev_ptr = NULL; WORD32 *p_in_ibuffer = usac_data->coef_fix[i_ch]; WORD32 *p_overlap_ibuffer = usac_data->overlap_data_ptr[i_ch]; WORD32 *p_out_ibuffer = usac_data->output_data_ptr[i_ch]; FLOAT32 *p_out_buffer = usac_data->time_sample_vector[i_ch]; WORD32 *scratch_mem = usac_data->scratch_buffer; WORD32 n_long = usac_data->ccfl; WORD32 td_frame_prev = usac_data->td_frame_prev[i_ch]; WORD32 fac_apply = usac_data->fac_data_present[i_ch]; WORD8 shiftp, output_q = 0, shift_olap = 14; WORD32 max_shift; WORD32 window_sequence = usac_data->window_sequence[i_ch]; WORD32 window_select_prev = usac_data->window_shape_prev[i_ch]; ia_usac_lpd_decoder_handle st = usac_data->str_tddec[i_ch]; WORD32 err_code = 0; if (usac_data->ec_flag) { td_frame_prev = usac_data->td_frame_prev_ec[i_ch]; } else { if (ixheaacd_drc_offset->n_long & (ixheaacd_drc_offset->n_long - 1)) { if ((ixheaacd_drc_offset->n_long != 48) && (ixheaacd_drc_offset->n_long != 96) && (ixheaacd_drc_offset->n_long != 192) && (ixheaacd_drc_offset->n_long != 384) && (ixheaacd_drc_offset->n_long != 768)) { return -1; } } } max_shift = ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long); ixheaacd_normalize(p_in_ibuffer, max_shift, ixheaacd_drc_offset->n_long); shiftp = max_shift + 6; ixheaacd_acelp_imdct(p_in_ibuffer, 2 * ixheaacd_drc_offset->n_long, &shiftp, scratch_mem); max_shift = ixheaacd_calc_max_spectralline(p_in_ibuffer, ixheaacd_drc_offset->n_long); ixheaacd_normalize(p_in_ibuffer, max_shift - 1, ixheaacd_drc_offset->n_long); shiftp += max_shift - 1; switch (window_sequence) { case ONLY_LONG_SEQUENCE: case LONG_START_SEQUENCE: err_code = ixheaacd_calc_window( &window_long_prev, ixheaacd_drc_offset->n_long, window_select_prev, usac_data->ec_flag); if (err_code == -1) return err_code; output_q = ixheaacd_windowing_long1( p_in_ibuffer + n_long / 2, p_overlap_ibuffer, window_long_prev, window_long_prev + ixheaacd_drc_offset->n_long - 1, p_out_ibuffer, ixheaacd_drc_offset->n_long, shiftp, shift_olap); break; case STOP_START_SEQUENCE: case LONG_STOP_SEQUENCE: err_code = ixheaacd_calc_window(&window_short_prev_ptr, ixheaacd_drc_offset->n_trans_ls, window_select_prev, usac_data->ec_flag); if (err_code == -1) return err_code; if (fac_apply) { output_q = ixheaacd_windowing_long2( p_in_ibuffer + n_long / 2, window_short_prev_ptr, fac_idata, p_overlap_ibuffer, p_out_ibuffer, ixheaacd_drc_offset, shiftp, shift_olap, fac_q); } else { output_q = ixheaacd_windowing_long3( p_in_ibuffer + n_long / 2, window_short_prev_ptr, p_overlap_ibuffer, p_out_ibuffer, window_short_prev_ptr + ixheaacd_drc_offset->n_trans_ls - 1, ixheaacd_drc_offset, shiftp, shift_olap); } break; } for (i = 0; i < ixheaacd_drc_offset->n_long / 2; i++) { p_overlap_ibuffer[ixheaacd_drc_offset->n_long / 2 + i] = ixheaacd_negate32_sat(p_in_ibuffer[i]) >> (shiftp - shift_olap); p_overlap_ibuffer[ixheaacd_drc_offset->n_long / 2 - i - 1] = ixheaacd_negate32_sat(p_in_ibuffer[i]) >> (shiftp - shift_olap); } ixheaacd_scale_down_adj(p_out_ibuffer, p_out_ibuffer, ixheaacd_drc_offset->n_long, output_q, 15); if (td_frame_prev) { qfac = 1.0f / (FLOAT32)(1 << 15); for (k = 0; k < ixheaacd_drc_offset->n_long; k++) { p_out_buffer[k] = ((FLOAT32)p_out_ibuffer[k]) * qfac; } err_code = ixheaacd_lpd_bpf_fix(usac_data, 0, p_out_buffer, st); if (err_code != 0) return err_code; for (k = 0; k < ixheaacd_drc_offset->n_long; k++) { p_out_ibuffer[k] = (WORD32)(p_out_buffer[k] * (1 << 15)); } } return 0; } WORD32 ixheaacd_fd_frm_dec(ia_usac_data_struct *usac_data, WORD32 i_ch) { WORD32 fac_idata[2 * FAC_LENGTH + 16]; offset_lengths ixheaacd_drc_offset; WORD8 fac_q = 0; IA_ERRORCODE err = IA_NO_ERROR; WORD32 td_frame_prev, fac_apply, window_sequence; if (usac_data->ec_flag) { usac_data->str_error_concealment[i_ch].pstr_ec_scratch = (ia_ec_scratch_str *)&usac_data->str_error_concealment[i_ch].str_ec_scratch; usac_data->core_mode = 0; ixheaacd_usac_apply_ec(usac_data, &ixheaacd_samp_rate_info[0], i_ch); } if (usac_data->ec_flag) { td_frame_prev = usac_data->td_frame_prev_ec[i_ch]; } else { td_frame_prev = usac_data->td_frame_prev[i_ch]; } fac_apply = usac_data->fac_data_present[i_ch]; window_sequence = usac_data->window_sequence[i_ch]; ixheaacd_drc_offset.n_long = usac_data->ccfl; ixheaacd_drc_offset.n_short = ixheaacd_drc_offset.n_long >> 3; memset(fac_idata, 0, sizeof(fac_idata)); if (td_frame_prev) { if (window_sequence == EIGHT_SHORT_SEQUENCE) { ixheaacd_drc_offset.lfac = ixheaacd_drc_offset.n_long >> 4; } else { ixheaacd_drc_offset.lfac = ixheaacd_drc_offset.n_long >> 3; } ixheaacd_drc_offset.n_flat_ls = (ixheaacd_drc_offset.n_long - (ixheaacd_drc_offset.lfac) * 2) >> 1; ixheaacd_drc_offset.n_trans_ls = (ixheaacd_drc_offset.lfac) << 1; } else { ixheaacd_drc_offset.lfac = FAC_LENGTH; ixheaacd_drc_offset.n_flat_ls = (ixheaacd_drc_offset.n_long - ixheaacd_drc_offset.n_short) >> 1; ixheaacd_drc_offset.n_trans_ls = ixheaacd_drc_offset.n_short; } if (fac_apply && usac_data->frame_ok == 1) { err = ixheaacd_cal_fac_data(usac_data, i_ch, ixheaacd_drc_offset.n_long, ixheaacd_drc_offset.lfac, fac_idata, &fac_q); if (err) return err; } if (window_sequence != EIGHT_SHORT_SEQUENCE) { err = ixheaacd_fd_imdct_long(usac_data, i_ch, fac_idata, &ixheaacd_drc_offset, fac_q); if (err) return err; } else { err = ixheaacd_fd_imdct_short(usac_data, i_ch, fac_idata, &ixheaacd_drc_offset, fac_q); if (err) return err; } return err; }