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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "ixheaacd_type_def.h"
#include "ixheaacd_interface.h"
#include "ixheaacd_mps_polyphase.h"
#include "ixheaacd_bitbuffer.h"
#include "ixheaacd_config.h"
#include "ixheaacd_mps_dec.h"
#include "ixheaacd_mps_interface.h"
#include "ixheaacd_constants.h"
#include "ixheaacd_basic_ops32.h"
#include "ixheaacd_function_selector.h"
extern const WORD32
ixheaacd_mps_polyphase_filter_coeff_fix[10 * MAX_NUM_QMF_BANDS_SAC / 2];
extern const WORD32 ixheaacd_mps_pre_re[64];
extern const WORD32 ixheaacd_mps_pre_im[64];
extern const WORD32 ixheaacd_mps_post_re[128];
extern const WORD32 ixheaacd_mps_post_im[128];
static PLATFORM_INLINE WORD32 ixheaacd_mult32(WORD32 a, WORD32 b) {
WORD32 result;
WORD64 temp_result;
temp_result = (WORD64)a * (WORD64)b;
result = (WORD32)(temp_result >> 31);
return (result);
}
VOID ixheaacd_mps_synt_create(ia_mps_poly_phase_struct *kernel,
WORD32 resolution) {
kernel->resolution = resolution;
}
VOID ixheaacd_mps_synt_init(ia_mps_poly_phase_synth_struct *self) {
memset(self->state, 0, sizeof(WORD32) * 64 * 20);
}
static VOID ixheaacd_float_to_int32(FLOAT32 *in, WORD32 *out, WORD32 q_factor,
WORD32 sample) {
WORD32 loop;
UWORD32 temp = (1 << q_factor);
for (loop = 0; loop < sample; loop++) out[loop] = (WORD32)(in[loop] * temp);
}
VOID ixheaacd_mps_synt_pre_twiddle_dec(WORD32 *ptr_in, const WORD32 *table_re,
const WORD32 *table_im,
WORD32 resolution) {
WORD32 tmp, k;
for (k = 0; k < 2 * resolution; k += 2) {
tmp = ixheaacd_add32_sat(ixheaacd_mult32(ptr_in[k], table_re[k >> 1]),
ixheaacd_mult32(ptr_in[k + 1], table_im[k >> 1]));
ptr_in[k + 1] = ixheaacd_add32_sat(
ixheaacd_mult32(ixheaacd_negate32_sat(ptr_in[k]), table_im[k >> 1]),
ixheaacd_mult32(ptr_in[k + 1], table_re[k >> 1]));
ptr_in[k] = tmp;
}
}
VOID ixheaacd_mps_synt_post_twiddle_dec(WORD32 *ptr_in, const WORD32 *table_re,
const WORD32 *table_im,
WORD32 resolution) {
WORD32 tmp, k;
for (k = 0; k < 2 * resolution; k += 2) {
tmp = ixheaacd_add32_sat(ixheaacd_mult32(ptr_in[k], table_re[k]),
ixheaacd_mult32(ptr_in[k + 1], table_im[k]));
ptr_in[k + 1] = ixheaacd_add32_sat(
ixheaacd_mult32(ixheaacd_negate32_sat(ptr_in[k]), table_im[k]),
ixheaacd_mult32(ptr_in[k + 1], table_re[k]));
ptr_in[k] = tmp;
}
}
VOID ixheaacd_mps_synt_post_fft_twiddle_dec(WORD32 resolution, WORD32 *fin_re,
WORD32 *fin_im,
const WORD32 *table_re,
const WORD32 *table_im,
WORD32 *state) {
WORD32 l;
for (l = 0; l < 2 * resolution; l++) {
state[2 * resolution - l - 1] =
ixheaacd_add32_sat(ixheaacd_mult32(fin_re[l], table_re[l]),
ixheaacd_mult32(fin_im[l], table_im[l]));
}
}
VOID ixheaacd_mps_synt_out_calc_dec(WORD32 resolution, WORD32 *out,
WORD32 *state, const WORD32 *filter_coeff) {
WORD32 l, k;
WORD32 *out1, *out2, *state1, *state2;
out1 = out;
out2 = out + resolution;
state1 = state;
state2 = state + (3 * resolution);
for (k = 0; k < 5; k++) {
for (l = 0; l < resolution; l++) {
*out1++ = (WORD32)(((WORD64)(*state1++) * (*filter_coeff++)) >> 31);
*out2++ = (WORD32)(((WORD64)(*state2++) * (*filter_coeff++)) >> 31);
}
out1 += resolution;
out2 += resolution;
state1 += (3 * resolution);
state2 += (3 * resolution);
}
}
VOID ixheaacd_mps_synt_calc(ia_mps_dec_state_struct *self) {
WORD32 k, l, ts, ch;
WORD64 acc;
WORD32 ptr_in[128];
WORD32 fin_re[128];
WORD32 fin_im[128];
FLOAT32 temp;
WORD32 *state, *tmp_state, *out;
const WORD32 *filt_coeff;
WORD32 *tmp_buf = self->tmp_buf;
ia_mps_poly_phase_struct kernel = self->poly_phase_filt_kernel;
WORD32 resolution = kernel.resolution;
for (ch = 0; ch < self->out_ch_count; ch++) {
tmp_state = (&self->qmf_filt_state[ch])->state;
state = &tmp_buf[self->time_slots * 2 * resolution];
memcpy(state, tmp_state, sizeof(WORD32) * 20 * resolution);
out = &tmp_buf[74 * MAX_NUM_QMF_BANDS_SAC];
for (ts = 0; ts < self->time_slots; ts++) {
ixheaacd_float_to_int32(&self->qmf_out_dir[ch][ts][0].re, ptr_in, 10,
resolution * 2);
filt_coeff = ixheaacd_mps_polyphase_filter_coeff_fix;
state -= (2 * resolution);
(*ixheaacd_mps_synt_pre_twiddle)(ptr_in, ixheaacd_mps_pre_re,
ixheaacd_mps_pre_im, resolution);
(*ixheaacd_mps_complex_fft_64)(ptr_in, fin_re, fin_im, resolution);
(*ixheaacd_mps_synt_post_twiddle)(ptr_in, ixheaacd_mps_post_re,
ixheaacd_mps_post_im, resolution);
(*ixheaacd_mps_complex_fft_64)(ptr_in, &fin_re[1], &fin_im[1],
resolution);
(*ixheaacd_mps_synt_post_fft_twiddle)(resolution, fin_re, fin_im,
ixheaacd_mps_post_re,
ixheaacd_mps_post_im, state);
(*ixheaacd_mps_synt_out_calc)(resolution, out, state, filt_coeff);
for (k = 0; k < resolution; k++) {
acc = 0;
for (l = 0; l < 10; l++) {
acc = acc + out[resolution * l + k];
}
if (acc >= 2147483647)
temp = 1.0;
else if (acc <= -2147483647 - 1)
temp = -1.0f;
else
temp = (FLOAT32)((WORD32)acc) / ((FLOAT32)(1 << 10));
self->output_buffer[ch][self->qmf_band_count * ts + k] = (FLOAT32)temp;
}
}
memcpy(tmp_state, state, sizeof(WORD32) * 20 * resolution);
}
}
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