268 lines
9.7 KiB
C
268 lines
9.7 KiB
C
/******************************************************************************
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* *
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <assert.h>
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#include "ixheaacd_type_def.h"
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#include "ixheaacd_bitbuffer.h"
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#include "ixheaacd_config.h"
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#include "ixheaacd_mps_polyphase.h"
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#include "ixheaacd_mps_dec.h"
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#include "ixheaacd_mps_interface.h"
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#include "ixheaacd_mps_polyphase.h"
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#include "ixheaacd_mps_decor.h"
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#include "ixheaacd_mps_hybfilter.h"
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#include "ixheaacd_error_standards.h"
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#include "ixheaacd_constants.h"
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static const WORD32 ixheaacd_decorr_delay[] = {11, 10, 5, 2};
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static const WORD32 ixheaacd_qmf_split_freq_0[] = {3, 15, 24, 65};
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static const WORD32 ixheaacd_qmf_split_freq_1[] = {3, 50, 65, 65};
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static const WORD32 ixheaacd_qmf_split_freq_2[] = {0, 15, 65, 65};
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static const FLOAT32
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ixheaacd_lattice_coeff_0_filt_den_coeff[DECORR_FILT_0_ORD + 1] = {
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1.000000f, -0.314818f, -0.256828f, -0.173641f, -0.115077f, 0.000599f,
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0.033343f, 0.122672f, -0.356362f, 0.128058f, 0.089800f};
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static const FLOAT32
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ixheaacd_lattice_coeff_0_filt_num_coeff[DECORR_FILT_0_ORD + 1] = {
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0.089800f, 0.128058f, -0.356362f, 0.122672f, 0.033343f, 0.000599f,
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-0.115077f, -0.173641f, -0.256828f, -0.314818f, 1.000000f};
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static const FLOAT32
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ixheaacd_lattice_coeff_1_filt_den_coeff[DECORR_FILT_1_ORD + 1] = {
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1.000000f, -0.287137f, -0.088940f, 0.123204f, -0.126111f,
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0.064218f, 0.045768f, -0.016264f, -0.122100f};
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static const FLOAT32
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ixheaacd_lattice_coeff_1_filt_num_coeff[DECORR_FILT_1_ORD + 1] = {
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-0.122100f, -0.016264f, 0.045768f, 0.064218f, -0.126111f,
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0.123204f, -0.088940f, -0.287137f, 1.000000f};
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static const FLOAT32
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ixheaacd_lattice_coeff_2_filt_den_coeff[DECORR_FILT_2_ORD + 1] = {
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1.000000f, 0.129403f, -0.032633f, 0.035700f};
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static const FLOAT32
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ixheaacd_lattice_coeff_2_filt_num_coeff[DECORR_FILT_2_ORD + 1] = {
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0.035700f, -0.032633f, 0.129403f, 1.000000f};
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static const FLOAT32
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ixheaacd_lattice_coeff_3_filt_den_coeff[DECORR_FILT_3_ORD + 1] = {
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1.000000f, 0.034742f, -0.013000f};
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static const FLOAT32
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ixheaacd_lattice_coeff_3_filt_num_coeff[DECORR_FILT_3_ORD + 1] = {
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-0.013000f, 0.034742f, 1.000000f};
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extern const WORD32
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ixheaacd_hybrid_band_71_to_processing_band_28_map[MAX_HYBRID_BANDS_MPS];
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static const WORD32 ixheaacd_hybrid_to_qmf_map[MAX_HYBRID_BANDS_MPS] = {
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0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10,
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11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
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29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
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47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63};
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static void ixheaacd_mps_decor_filt_init(ia_mps_decor_filt_struct *self,
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WORD32 reverb_band) {
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switch (reverb_band) {
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case 0:
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self->num_len = self->den_len = DECORR_FILT_0_ORD + 1;
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self->num = ixheaacd_lattice_coeff_0_filt_num_coeff;
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self->den = ixheaacd_lattice_coeff_0_filt_den_coeff;
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break;
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case 1:
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self->num_len = self->den_len = DECORR_FILT_1_ORD + 1;
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self->num = ixheaacd_lattice_coeff_1_filt_num_coeff;
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self->den = ixheaacd_lattice_coeff_1_filt_den_coeff;
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break;
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case 2:
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self->num_len = self->den_len = DECORR_FILT_2_ORD + 1;
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self->num = ixheaacd_lattice_coeff_2_filt_num_coeff;
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self->den = ixheaacd_lattice_coeff_2_filt_den_coeff;
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break;
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case 3:
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self->num_len = self->den_len = DECORR_FILT_3_ORD + 1;
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self->num = ixheaacd_lattice_coeff_3_filt_num_coeff;
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self->den = ixheaacd_lattice_coeff_3_filt_den_coeff;
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break;
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}
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self->state_len = self->num_len;
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memset(self->state, 0,
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sizeof(ia_cmplx_flt_struct) * (MAX_DECORR_FIL_ORDER + 1));
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return;
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}
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static VOID ixheaacd_mps_allpass_apply(ia_mps_decor_filt_struct *self,
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ia_cmplx_flt_struct *input, WORD32 len,
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ia_cmplx_flt_struct *output) {
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WORD32 i, j;
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for (i = 0; i < len; i++) {
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output[i].re = self->state[0].re + input[i].re * self->num[0];
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output[i].im = self->state[0].im + input[i].im * self->num[0];
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for (j = 1; j < self->num_len; j++) {
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self->state[j - 1].re = self->state[j].re + self->num[j] * input[i].re -
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self->den[j] * output[i].re;
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self->state[j - 1].im = self->state[j].im + self->num[j] * input[i].im -
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self->den[j] * output[i].im;
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}
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}
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}
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static VOID ixheaacd_mps_decor_energy_adjustment(
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ixheaacd_mps_decor_energy_adjust_filt_struct *handle,
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ia_cmplx_flt_struct in[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
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ia_cmplx_flt_struct out[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
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WORD32 time_slots) {
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ixheaacd_mps_decor_energy_adjust_filt_struct *self =
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(ixheaacd_mps_decor_energy_adjust_filt_struct *)handle;
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FLOAT32 in_energy[MAX_PARAMETER_BANDS] = {0};
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FLOAT32 out_energy[MAX_PARAMETER_BANDS] = {0};
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FLOAT32 gain[MAX_PARAMETER_BANDS];
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WORD32 i, j, k;
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for (i = 0; i < time_slots; i++) {
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memset(in_energy, 0, sizeof(FLOAT32) * MAX_PARAMETER_BANDS);
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memset(out_energy, 0, sizeof(FLOAT32) * MAX_PARAMETER_BANDS);
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for (j = 0; j < self->num_bins; j++) {
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k = ixheaacd_hybrid_band_71_to_processing_band_28_map[j];
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in_energy[k] += in[i][j].re * in[i][j].re + in[i][j].im * in[i][j].im;
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out_energy[k] +=
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out[i][j].re * out[i][j].re + out[i][j].im * out[i][j].im;
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}
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for (k = 0; k < MAX_PARAMETER_BANDS; k++) {
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self->smooth_in_energy[k] = self->smooth_in_energy[k] * DECOR_ALPHA +
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in_energy[k] * ONE_MINUS_DECOR_ALPHA;
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self->smooth_out_energy[k] = self->smooth_out_energy[k] * DECOR_ALPHA +
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out_energy[k] * ONE_MINUS_DECOR_ALPHA;
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gain[k] = 1.0f;
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if (self->smooth_out_energy[k] >
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self->smooth_in_energy[k] * DECOR_GAMMA) {
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gain[k] = (FLOAT32)sqrt(self->smooth_in_energy[k] * DECOR_GAMMA /
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(self->smooth_out_energy[k] + ABS_THR));
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}
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if (self->smooth_in_energy[k] >
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self->smooth_out_energy[k] * DECOR_GAMMA) {
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gain[k] =
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min(2.0f, (FLOAT32)sqrt(self->smooth_in_energy[k] /
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(DECOR_GAMMA * self->smooth_out_energy[k] +
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ABS_THR)));
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}
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}
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for (j = 0; j < self->num_bins; j++) {
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k = ixheaacd_hybrid_band_71_to_processing_band_28_map[j];
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out[i][j].re *= gain[k];
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out[i][j].im *= gain[k];
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}
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}
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}
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IA_ERRORCODE ixheaacd_mps_decor_init(ia_mps_decor_struct_handle self,
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WORD32 subbands, WORD32 decor_config) {
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WORD32 i, reverb_band;
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const WORD32 *splitfreq;
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switch (decor_config) {
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case 0:
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splitfreq = ixheaacd_qmf_split_freq_0;
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break;
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case 1:
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splitfreq = ixheaacd_qmf_split_freq_1;
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break;
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case 2:
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splitfreq = ixheaacd_qmf_split_freq_2;
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break;
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default:
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return IA_FATAL_ERROR;
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}
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self->num_bins = subbands;
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for (i = 0; i < self->num_bins; i++) {
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reverb_band = 0;
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while ((reverb_band < 3) &&
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(ixheaacd_hybrid_to_qmf_map[i] >= (splitfreq[reverb_band] - 1)))
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reverb_band++;
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self->delay_sample_count[i] = ixheaacd_decorr_delay[reverb_band];
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ixheaacd_mps_decor_filt_init(&self->filter[i], reverb_band);
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}
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self->decor_nrg_smooth.num_bins = self->num_bins;
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return IA_NO_ERROR;
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}
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VOID ixheaacd_mps_decor_apply(
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ia_mps_decor_struct_handle self,
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ia_cmplx_flt_struct in[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
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ia_cmplx_flt_struct out[MAX_TIME_SLOTS][MAX_HYBRID_BANDS_MPS],
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WORD32 length) {
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WORD32 idx, sb_sample;
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ia_cmplx_flt_struct scratch[MAX_TIME_SLOTS];
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for (idx = 0; idx < self->num_bins; idx++) {
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for (sb_sample = 0; sb_sample < length; sb_sample++) {
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self->decor_delay_buffer[idx][self->delay_sample_count[idx] + sb_sample]
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.re = in[sb_sample][idx].re;
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self->decor_delay_buffer[idx][self->delay_sample_count[idx] + sb_sample]
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.im = in[sb_sample][idx].im;
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}
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ixheaacd_mps_allpass_apply(&self->filter[idx],
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self->decor_delay_buffer[idx], length, scratch);
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for (sb_sample = 0; sb_sample < length; sb_sample++) {
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out[sb_sample][idx].re = scratch[sb_sample].re;
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out[sb_sample][idx].im = scratch[sb_sample].im;
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}
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for (sb_sample = 0; sb_sample < self->delay_sample_count[idx];
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sb_sample++) {
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self->decor_delay_buffer[idx][sb_sample].re =
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self->decor_delay_buffer[idx][length + sb_sample].re;
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self->decor_delay_buffer[idx][sb_sample].im =
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self->decor_delay_buffer[idx][length + sb_sample].im;
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}
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}
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ixheaacd_mps_decor_energy_adjustment(&self->decor_nrg_smooth, in, out,
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length);
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}
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