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/******************************************************************************
*
* 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 <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "impd_type_def.h"
#include "impd_error_standards.h"
#include "impd_drc_extr_delta_coded_info.h"
#include "impd_drc_common.h"
#include "impd_drc_struct.h"
#include "impd_drc_filter_bank.h"
#include "impd_drc_multi_band.h"
#include "impd_drc_rom.h"
IA_ERRORCODE impd_fcenter_norm_sb_init(WORD32 num_subbands,
FLOAT32* fcenter_norm_subband) {
WORD32 s;
for (s = 0; s < num_subbands; s++) {
fcenter_norm_subband[s] = (s + 0.5f) / (2.0f * num_subbands);
}
return (0);
}
IA_ERRORCODE impd_generate_slope(WORD32 num_sub_bands,
FLOAT32* fcenter_norm_subband,
FLOAT32 fcross_norm_lo, FLOAT32 fcross_norm_hi,
FLOAT32* response) {
WORD32 i;
FLOAT32 filter_slope = -24.0f;
FLOAT32 inv_log10_2 = 3.32192809f;
FLOAT32 norm = 0.05f * filter_slope * inv_log10_2;
for (i = 0; i < num_sub_bands; i++) {
if (fcenter_norm_subband[i] < fcross_norm_lo) {
response[i] = (FLOAT32)pow(
10.0, norm * log10(fcross_norm_lo / fcenter_norm_subband[i]));
} else if (fcenter_norm_subband[i] < fcross_norm_hi) {
response[i] = 1.0f;
} else {
response[i] = (FLOAT32)pow(
10.0, norm * log10(fcenter_norm_subband[i] / fcross_norm_hi));
}
}
return (0);
}
IA_ERRORCODE impd_generate_overlap_weights(
WORD32 num_drc_bands, WORD32 drc_band_type,
ia_gain_params_struct* gain_params, WORD32 dec_subband_count,
ia_group_overlap_params_struct* pstr_group_overlap_params) {
FLOAT32 fcenter_norm_subband[AUDIO_CODEC_SUBBAND_COUNT_MAX];
FLOAT32 w_norm[AUDIO_CODEC_SUBBAND_COUNT_MAX];
FLOAT32 fcross_norm_lo, fcross_norm_hi;
WORD32 err, b, s, start_subband_index = 0, stop_sub_band_index = 0;
err = impd_fcenter_norm_sb_init(dec_subband_count, fcenter_norm_subband);
if (drc_band_type == 1) {
fcross_norm_lo = 0.0f;
for (b = 0; b < num_drc_bands; b++) {
if (b < num_drc_bands - 1) {
fcross_norm_hi =
normal_cross_freq[gain_params[b + 1].crossover_freq_idx]
.f_cross_norm;
} else {
fcross_norm_hi = 0.5f;
}
impd_generate_slope(
dec_subband_count, fcenter_norm_subband, fcross_norm_lo,
fcross_norm_hi,
pstr_group_overlap_params->str_band_overlap_params[b].overlap_weight);
fcross_norm_lo = fcross_norm_hi;
}
for (s = 0; s < dec_subband_count; s++) {
w_norm[s] = pstr_group_overlap_params->str_band_overlap_params[0]
.overlap_weight[s];
for (b = 1; b < num_drc_bands; b++) {
w_norm[s] += pstr_group_overlap_params->str_band_overlap_params[b]
.overlap_weight[s];
}
}
for (s = 0; s < dec_subband_count; s++) {
for (b = 0; b < num_drc_bands; b++) {
pstr_group_overlap_params->str_band_overlap_params[b]
.overlap_weight[s] /= w_norm[s];
}
}
} else {
start_subband_index = 0;
for (b = 0; b < num_drc_bands; b++) {
if (b < num_drc_bands - 1) {
stop_sub_band_index = gain_params[b + 1].start_subband_index - 1;
} else {
stop_sub_band_index = dec_subband_count - 1;
}
for (s = 0; s < dec_subband_count; s++) {
if (s >= start_subband_index && s <= stop_sub_band_index) {
pstr_group_overlap_params->str_band_overlap_params[b]
.overlap_weight[s] = 1.0;
} else {
pstr_group_overlap_params->str_band_overlap_params[b]
.overlap_weight[s] = 0.0;
}
}
start_subband_index = stop_sub_band_index + 1;
}
}
return (0);
}
IA_ERRORCODE impd_init_overlap_weight(
ia_uni_drc_coeffs_struct* str_p_loc_drc_coefficients_uni_drc,
ia_drc_instructions_struct* str_drc_instruction_str,
WORD32 sub_band_domain_mode,
ia_overlap_params_struct* pstr_overlap_params) {
WORD32 err = 0, g;
WORD32 dec_subband_count = 0;
switch (sub_band_domain_mode) {
case SUBBAND_DOMAIN_MODE_QMF64:
dec_subband_count = AUDIO_CODEC_SUBBAND_COUNT_QMF64;
break;
case SUBBAND_DOMAIN_MODE_QMF71:
dec_subband_count = AUDIO_CODEC_SUBBAND_COUNT_QMF71;
break;
case SUBBAND_DOMAIN_MODE_STFT256:
dec_subband_count = AUDIO_CODEC_SUBBAND_COUNT_STFT256;
break;
}
for (g = 0; g < str_drc_instruction_str->num_drc_ch_groups; g++) {
if (str_drc_instruction_str->band_count_of_ch_group[g] > 1) {
err = impd_generate_overlap_weights(
str_drc_instruction_str->band_count_of_ch_group[g],
str_p_loc_drc_coefficients_uni_drc
->gain_set_params[str_drc_instruction_str
->gain_set_index_for_channel_group[g]]
.drc_band_type,
str_p_loc_drc_coefficients_uni_drc
->gain_set_params[str_drc_instruction_str
->gain_set_index_for_channel_group[g]]
.gain_params,
dec_subband_count,
&(pstr_overlap_params->str_group_overlap_params[g]));
if (err) return (err);
}
}
return (0);
}
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