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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_prototype.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 EXTRA_SZ ((PROTO_SZ - SUBBANDS_NUM))
const uint16_t at3plus_pqf_frame_sz = FRAME_SZ;
const uint16_t at3plus_pqf_proto_sz = PROTO_SZ;
static float C[PROTO_SZ];
static float M[256];
struct at3plus_pqf_a_ctx {
float buf[FRAME_SZ + EXTRA_SZ];
};
static void init(void)
{
int i;
int j;
const float* const t = at3plus_pqf_prototype;
static int inited = 0;
if (inited)
return;
inited = 1;
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j++) {
M[i*16 + j] = (float)cos(((2 * i + 1) * j & 127) * M_PI / 32);
}
}
for (i = 0; i < 6; i++) {
for (j = 0; j < 32; j++) {
if (i & 1) {
C[j * 12 + i] = 1.489 * t[j * 2 + 64 * i];
C[j * 12 + 6 + i] = 1.489 * t[j * 2 + 1 + 64 * i];
} else {
C[j * 12 + i] = -1.489 * t[j * 2 + 64 * i];
C[j * 12 + 6 + i] = -1.489 * t[j * 2 + 1 + 64 * i];
}
}
}
}
static void vectoring(const float* x, float* y)
{
int i;
int j;
const float* c = C;
for ( i = 0; i < SUBBANDS_NUM * 2; i++, c += 12, x += 1, y += 1 ) {
y[0] = 0;
for (j = 0; j < 12; j++) {
y[0] += c[j] * x[j * 32];
}
}
}
static void matrixing(const float* mi, const float* y, float* samples )
{
int i;
for (i = 0; i < SUBBANDS_NUM; i++, mi += 16, samples += SUBBAND_SIZE) {
samples[0] = y[8] + mi[ 1] * (y[7]+y[9])
+ mi[ 2] * (y[6]+y[10]) + mi[ 3] * (y[5]+y[11])
+ mi[ 4] * (y[4]+y[12]) + mi[ 5] * (y[3]+y[13])
+ mi[ 6] * (y[2]+y[14]) + mi[ 7] * (y[ 1]+y[15])
+ mi[ 8] * (y[ 0]+y[16])
+ mi[15] * (y[23]-y[25]) + mi[14] * (y[22]-y[26])
+ mi[13] * (y[21]-y[27]) + mi[12] * (y[20]-y[28])
+ mi[11] * (y[19]-y[29]) + mi[10] * (y[18]-y[30])
+ mi[ 9] * (y[17]-y[31]);
}
}
static void a_init(at3plus_pqf_a_ctx_t ctx)
{
float y[SUBBANDS_NUM * 2];
float out[FRAME_SZ];
float* x;
int n, i;
float* buf = ctx->buf;
init();
memcpy ( buf + FRAME_SZ, buf, EXTRA_SZ * sizeof(*buf) );
x = buf + FRAME_SZ;
for ( n = 0; n < SUBBAND_SIZE; n++ ) {
x -= SUBBANDS_NUM;
for (i = 0; i < SUBBANDS_NUM; i++)
x[i] = 0.0;
vectoring(x, y);
matrixing (M, y, &out[n]);
}
}
at3plus_pqf_a_ctx_t at3plus_pqf_create_a_ctx()
{
int i = 0;
at3plus_pqf_a_ctx_t ctx = (at3plus_pqf_a_ctx_t)malloc(sizeof(struct at3plus_pqf_a_ctx));
for (i = 0; i < FRAME_SZ + EXTRA_SZ; i++) {
ctx->buf[i] = 0.0;
}
a_init(ctx);
return ctx;
}
void at3plus_pqf_free_a_ctx(at3plus_pqf_a_ctx_t 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* x;
const float* pcm;
int n, i;
float* buf = ctx->buf;
memcpy(buf + FRAME_SZ, buf, EXTRA_SZ * sizeof(float));
x = buf + FRAME_SZ;
pcm = in + (SUBBANDS_NUM - 1);
for (n = 0; n < SUBBAND_SIZE; n++, pcm += SUBBANDS_NUM * 2) {
x -= SUBBANDS_NUM;
for (i = 0; i < SUBBANDS_NUM; i++) {
x[i] = *pcm--;
}
vectoring(x, y);
matrixing (M, y, &out[n]);
}
}
const float* at3plus_pqf_get_proto(void)
{
return at3plus_pqf_prototype;
}
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