/******************************************************************************
* *
* 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 <string.h>
#include <assert.h>
#include <ixheaacd_type_def.h>
#include "ixheaacd_bitbuffer.h"
#include "ixheaacd_config.h"
#include "ixheaacd_mps_polyphase.h"
#include "ixheaacd_mps_dec.h"
#include "ixheaacd_mps_interface.h"
#include "ixheaacd_mps_polyphase.h"
#include "ixheaacd_mps_decor.h"
#include "ixheaacd_mps_hybfilter.h"
#include "ixheaacd_constants.h"
static WORD32 ixheaacd_decorr_delay[] = {11, 10, 5, 2};
static WORD32 ixheaacd_qmf_split_freq_0[] = {3, 15, 24, 65};
static WORD32 ixheaacd_qmf_split_freq_1[] = {3, 50, 65, 65};
static WORD32 ixheaacd_qmf_split_freq_2[] = {0, 15, 65, 65};
static FLOAT32 ixheaacd_lattice_coeff_0_filt_den_coeff[DECORR_FILT_0_ORD + 1] =
{1.000000f, -0.314818f, -0.256828f, -0.173641f, -0.115077f, 0.000599f,
0.033343f, 0.122672f, -0.356362f, 0.128058f, 0.089800f};
static FLOAT32 ixheaacd_lattice_coeff_0_filt_num_coeff[DECORR_FILT_0_ORD + 1] =
{0.089800f, 0.128058f, -0.356362f, 0.122672f, 0.033343f, 0.000599f,
-0.115077f, -0.173641f, -0.256828f, -0.314818f, 1.000000f};
static FLOAT32 ixheaacd_lattice_coeff_1_filt_den_coeff[DECORR_FILT_1_ORD + 1] =
{1.000000f, -0.287137f, -0.088940f, 0.123204f, -0.126111f,
0.064218f, 0.045768f, -0.016264f, -0.122100f};
static FLOAT32 ixheaacd_lattice_coeff_1_filt_num_coeff[DECORR_FILT_1_ORD + 1] =
{-0.122100f, -0.016264f, 0.045768f, 0.064218f, -0.126111f,
0.123204f, -0.088940f, -0.287137f, 1.000000f};
static FLOAT32 ixheaacd_lattice_coeff_2_filt_den_coeff[DECORR_FILT_2_ORD + 1] =
{1.000000f, 0.129403f, -0.032633f, 0.035700f};
static FLOAT32 ixheaacd_lattice_coeff_2_filt_num_coeff[DECORR_FILT_2_ORD + 1] =
{0.035700f, -0.032633f, 0.129403f, 1.000000f};
static FLOAT32 ixheaacd_lattice_coeff_3_filt_den_coeff[DECORR_FILT_3_ORD + 1] =
{1.000000f, 0.034742f, -0.013000f};
static FLOAT32 ixheaacd_lattice_coeff_3_filt_num_coeff[DECORR_FILT_3_ORD + 1] =
{-0.013000f, 0.034742f, 1.000000f};
extern WORD32
ixheaacd_hybrid_band_71_to_processing_band_28_map[MAX_HYBRID_BANDS_MPS];
static WORD32 ixheaacd_hybrid_to_qmf_map[MAX_HYBRID_BANDS_MPS] = {
0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63};
static void ixheaacd_mps_decor_filt_init(ia_mps_decor_filt_struct *self,
WORD32 reverb_band) {
switch (reverb_band) {
case 0:
self->num_len = self->den_len = DECORR_FILT_0_ORD + 1;
self->num = ixheaacd_lattice_coeff_0_filt_num_coeff;
self->den = ixheaacd_lattice_coeff_0_filt_den_coeff;
break;
case 1:
self->num_len = self->den_len = DECORR_FILT_1_ORD + 1;
self->num = ixheaacd_lattice_coeff_1_filt_num_coeff;
self->den = ixheaacd_lattice_coeff_1_filt_den_coeff;
break;
case 2:
self->num_len = self->den_len = DECORR_FILT_2_ORD + 1;
self->num = ixheaacd_lattice_coeff_2_filt_num_coeff;
self->den = ixheaacd_lattice_coeff_2_filt_den_coeff;
break;
case 3:
self->num_len = self->den_len = DECORR_FILT_3_ORD + 1;
self->num = ixheaacd_lattice_coeff_3_filt_num_coeff;
self->den = ixheaacd_lattice_coeff_3_filt_den_coeff;
break;
}
self->state_len = self->num_len;
memset(self->state, 0,
sizeof(ia_cmplx_flt_struct) * (MAX_DECORR_FIL_ORDER + 1));
return;
}
static VOID ixheaacd_mps_allpass_apply(ia_mps_decor_filt_struct *self,
ia_cmplx_flt_struct *input, WORD32 len,
ia_cmplx_flt_struct *output) {
WORD32 i, j;
for (i = 0; i < len; i++) {
output[i].re = self->state[0].re + input[i].re * self->num[0];
output[i].im = self->state[0].im + input[i].im * self->num[0];
for (j = 1; j < self->num_len; j++) {
self->state[j - 1].re = self->state[j].re + self->num[j] * input[i].re -
self->den[j] * output[i].re;
self->state[j - 1].im = self->state[j].im + self->num[j] * input[i].im -
self->den[j] * output[i].im;
}
}
}
static VOID ixheaacd_mps_decor_energy_adjustment(
ixheaacd_mps_decor_energy_adjust_filt_struct *handle,
ia_cmplx_flt_struct in[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
ia_cmplx_flt_struct out[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
WORD32 time_slots) {
ixheaacd_mps_decor_energy_adjust_filt_struct *self =
(ixheaacd_mps_decor_energy_adjust_filt_struct *)handle;
FLOAT32 in_energy[MAX_PARAMETER_BANDS] = {0};
FLOAT32 out_energy[MAX_PARAMETER_BANDS] = {0};
FLOAT32 gain[MAX_PARAMETER_BANDS];
WORD32 i, j, k;
for (i = 0; i < time_slots; i++) {
memset(in_energy, 0, sizeof(FLOAT32) * MAX_PARAMETER_BANDS);
memset(out_energy, 0, sizeof(FLOAT32) * MAX_PARAMETER_BANDS);
for (j = 0; j < self->num_bins; j++) {
k = ixheaacd_hybrid_band_71_to_processing_band_28_map[j];
in_energy[k] += in[i][j].re * in[i][j].re + in[i][j].im * in[i][j].im;
out_energy[k] +=
out[i][j].re * out[i][j].re + out[i][j].im * out[i][j].im;
}
for (k = 0; k < MAX_PARAMETER_BANDS; k++) {
self->smooth_in_energy[k] = self->smooth_in_energy[k] * DECOR_ALPHA +
in_energy[k] * ONE_MINUS_DECOR_ALPHA;
self->smooth_out_energy[k] = self->smooth_out_energy[k] * DECOR_ALPHA +
out_energy[k] * ONE_MINUS_DECOR_ALPHA;
gain[k] = 1.0f;
if (self->smooth_out_energy[k] >
self->smooth_in_energy[k] * DECOR_GAMMA) {
gain[k] = (FLOAT32)sqrt(self->smooth_in_energy[k] * DECOR_GAMMA /
(self->smooth_out_energy[k] + ABS_THR));
}
if (self->smooth_in_energy[k] >
self->smooth_out_energy[k] * DECOR_GAMMA) {
gain[k] =
min(2.0f, (FLOAT32)sqrt(self->smooth_in_energy[k] /
(DECOR_GAMMA * self->smooth_out_energy[k] +
ABS_THR)));
}
}
for (j = 0; j < self->num_bins; j++) {
k = ixheaacd_hybrid_band_71_to_processing_band_28_map[j];
out[i][j].re *= gain[k];
out[i][j].im *= gain[k];
}
}
}
void ixheaacd_mps_decor_init(ia_mps_decor_struct_handle self, WORD32 subbands,
WORD32 decor_config) {
WORD32 i, reverb_band;
WORD32 *splitfreq;
switch (decor_config) {
case 0:
splitfreq = ixheaacd_qmf_split_freq_0;
break;
case 1:
splitfreq = ixheaacd_qmf_split_freq_1;
break;
case 2:
splitfreq = ixheaacd_qmf_split_freq_2;
break;
default:
return;
}
self->num_bins = subbands;
for (i = 0; i < self->num_bins; i++) {
reverb_band = 0;
while ((reverb_band < 3) &&
(ixheaacd_hybrid_to_qmf_map[i] >= (splitfreq[reverb_band] - 1)))
reverb_band++;
self->delay_sample_count[i] = ixheaacd_decorr_delay[reverb_band];
ixheaacd_mps_decor_filt_init(&self->filter[i], reverb_band);
}
self->decor_nrg_smooth.num_bins = self->num_bins;
return;
}
VOID ixheaacd_mps_decor_apply(
ia_mps_decor_struct_handle self,
ia_cmplx_flt_struct in[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
ia_cmplx_flt_struct out[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
WORD32 length) {
WORD32 idx, sb_sample;
ia_cmplx_flt_struct scratch[MAX_TIME_SLOTS];
for (idx = 0; idx < self->num_bins; idx++) {
for (sb_sample = 0; sb_sample < length; sb_sample++) {
self->decor_delay_buffer[idx][self->delay_sample_count[idx] + sb_sample]
.re = in[sb_sample][idx].re;
self->decor_delay_buffer[idx][self->delay_sample_count[idx] + sb_sample]
.im = in[sb_sample][idx].im;
}
ixheaacd_mps_allpass_apply(&self->filter[idx],
self->decor_delay_buffer[idx], length, scratch);
for (sb_sample = 0; sb_sample < length; sb_sample++) {
out[sb_sample][idx].re = scratch[sb_sample].re;
out[sb_sample][idx].im = scratch[sb_sample].im;
}
for (sb_sample = 0; sb_sample < self->delay_sample_count[idx];
sb_sample++) {
self->decor_delay_buffer[idx][sb_sample].re =
self->decor_delay_buffer[idx][length + sb_sample].re;
self->decor_delay_buffer[idx][sb_sample].im =
self->decor_delay_buffer[idx][length + sb_sample].im;
}
}
ixheaacd_mps_decor_energy_adjustment(&self->decor_nrg_smooth, in, out,
length);
}