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/*
* This file is part of AtracDEnc.
*
* AtracDEnc is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* AtracDEnc is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Musepack pqf implementation was used as reference.
* see svn.musepack.net
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include "atrac3plus_pqf.h"
#include "atrac3plus_pqf_data.h"
#include "lib/mdct/dct.h"
/*
* Number of subbands to split input signal
*/
#define SUBBANDS_NUM 16
/*
* Number of samples in each subband
*/
#define SUBBAND_SIZE 128
/*
* Size of filter prototype
*/
#define PROTO_SZ 384
#define FRAME_SZ ((SUBBANDS_NUM * SUBBAND_SIZE))
#define OVERLAP_SZ ((PROTO_SZ - SUBBANDS_NUM))
static float fir[PROTO_SZ];
struct at3plus_pqf_a_ctx {
float buf[FRAME_SZ + OVERLAP_SZ];
atde_dct_ctx_t dct_ctx;
};
static void init(void)
{
static int inited = 0;
if (inited)
return;
inited = 1;
for (int i = 0; i < 16; i++) {
for (int j = 0; j < ATRAC3P_PQF_FIR_LEN; j++) {
if (i >= 8) {
fir[j + 96 + (i - 8) * 12] = ff_ipqf_coeffs1[j][i];
fir[j + 288 + (i - 8) * 12] = ff_ipqf_coeffs2[j][i];
} else {
fir[j + 192 + i * 12] = ff_ipqf_coeffs2[j][i];
fir[j + 0 + i * 12] = ff_ipqf_coeffs1[j][i];
}
}
}
}
static void vectoring(const float* const x, float* y)
{
for (int i = 0; i < 32; i++) {
y[i] = 0;
for (int j = 0; j < ATRAC3P_PQF_FIR_LEN; j++) {
y[i] += fir[i * 12 + j] * x[j * 32 + i];
}
}
}
static void matrixing(atde_dct_ctx_t ctx, const float* y, float* samples )
{
float yy[SUBBANDS_NUM];
float res[SUBBANDS_NUM];
for (int i = 0; i < 8; i++) {
yy[i] = y[i + 8] + y[7 - i];
yy[i + 8] = y[i + 16] + y[31 - i];
}
atde_do_dct4_16(ctx, yy, res);
for (int i = 0; i < SUBBANDS_NUM; i++) {
samples[i * SUBBAND_SIZE] = res[SUBBANDS_NUM - 1 - i];
}
}
at3plus_pqf_a_ctx_t at3plus_pqf_create_a_ctx()
{
at3plus_pqf_a_ctx_t ctx = (at3plus_pqf_a_ctx_t)malloc(sizeof(struct at3plus_pqf_a_ctx));
for (int i = 0; i < FRAME_SZ + OVERLAP_SZ; i++) {
ctx->buf[i] = 0.0;
}
ctx->dct_ctx = atde_create_dct4_16(128 * 512.0);
init();
return ctx;
}
void at3plus_pqf_free_a_ctx(at3plus_pqf_a_ctx_t ctx)
{
atde_free_dct_ctx(ctx->dct_ctx);
free(ctx);
}
void at3plus_pqf_do_analyse(at3plus_pqf_a_ctx_t ctx, const float* in, float* out)
{
float y[SUBBANDS_NUM * 2];
float* const buf = ctx->buf;
const float* x = buf;
memcpy(buf + OVERLAP_SZ, in, sizeof(in[0]) * FRAME_SZ);
for (int i = 0; i < SUBBAND_SIZE; i++) {
vectoring(x, y);
matrixing (ctx->dct_ctx, y, &out[i]);
x += SUBBANDS_NUM;
}
memcpy(buf, buf + FRAME_SZ, sizeof(buf[0]) * OVERLAP_SZ);
}
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