ref: 97c465a910d8e377504b5e06fef136ea68cb798f
dir: /libfaad/ps_dec.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** The "appropriate copyright message" mentioned in section 2c of the GPLv2
** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: ps_dec.c,v 1.16 2009/01/26 22:32:31 menno Exp $
**/
#include "common.h"
#ifdef PS_DEC
#include "ps_dec.h"
#include "ps_tables.h"
/* constants */
#define NEGATE_IPD_MASK (0x1000)
#define DECAY_SLOPE FRAC_CONST(0.05)
#define COEF_SQRT2 COEF_CONST(1.4142135623731)
/* tables */
/* filters are mirrored in coef 6, second half left out */
static const real_t p8_13_20[7] =
{
FRAC_CONST(0.00746082949812),
FRAC_CONST(0.02270420949825),
FRAC_CONST(0.04546865930473),
FRAC_CONST(0.07266113929591),
FRAC_CONST(0.09885108575264),
FRAC_CONST(0.11793710567217),
FRAC_CONST(0.125)
};
static const real_t p2_13_20[7] =
{
FRAC_CONST(0.0),
FRAC_CONST(0.01899487526049),
FRAC_CONST(0.0),
FRAC_CONST(-0.07293139167538),
FRAC_CONST(0.0),
FRAC_CONST(0.30596630545168),
FRAC_CONST(0.5)
};
static const real_t p12_13_34[7] =
{
FRAC_CONST(0.04081179924692),
FRAC_CONST(0.03812810994926),
FRAC_CONST(0.05144908135699),
FRAC_CONST(0.06399831151592),
FRAC_CONST(0.07428313801106),
FRAC_CONST(0.08100347892914),
FRAC_CONST(0.08333333333333)
};
static const real_t p8_13_34[7] =
{
FRAC_CONST(0.01565675600122),
FRAC_CONST(0.03752716391991),
FRAC_CONST(0.05417891378782),
FRAC_CONST(0.08417044116767),
FRAC_CONST(0.10307344158036),
FRAC_CONST(0.12222452249753),
FRAC_CONST(0.125)
};
static const real_t p4_13_34[7] =
{
FRAC_CONST(-0.05908211155639),
FRAC_CONST(-0.04871498374946),
FRAC_CONST(0.0),
FRAC_CONST(0.07778723915851),
FRAC_CONST(0.16486303567403),
FRAC_CONST(0.23279856662996),
FRAC_CONST(0.25)
};
#ifdef PARAM_32KHZ
static const uint8_t delay_length_d[2][NO_ALLPASS_LINKS] = {
{ 1, 2, 3 } /* d_24kHz */,
{ 3, 4, 5 } /* d_48kHz */
};
#else
static const uint8_t delay_length_d[NO_ALLPASS_LINKS] = {
3, 4, 5 /* d_48kHz */
};
#endif
static const real_t filter_a[NO_ALLPASS_LINKS] = { /* a(m) = exp(-d_48kHz(m)/7) */
FRAC_CONST(0.65143905753106),
FRAC_CONST(0.56471812200776),
FRAC_CONST(0.48954165955695)
};
static const uint8_t group_border20[10+12 + 1] =
{
6, 7, 0, 1, 2, 3, /* 6 subqmf subbands */
9, 8, /* 2 subqmf subbands */
10, 11, /* 2 subqmf subbands */
3, 4, 5, 6, 7, 8, 9, 11, 14, 18, 23, 35, 64
};
static const uint8_t group_border34[32+18 + 1] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, /* 12 subqmf subbands */
12, 13, 14, 15, 16, 17, 18, 19, /* 8 subqmf subbands */
20, 21, 22, 23, /* 4 subqmf subbands */
24, 25, 26, 27, /* 4 subqmf subbands */
28, 29, 30, 31, /* 4 subqmf subbands */
32-27, 33-27, 34-27, 35-27, 36-27, 37-27, 38-27, 40-27, 42-27, 44-27, 46-27, 48-27, 51-27, 54-27, 57-27, 60-27, 64-27, 68-27, 91-27
};
static const uint16_t map_group2bk20[10+12] =
{
(NEGATE_IPD_MASK | 1), (NEGATE_IPD_MASK | 0),
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
};
static const uint16_t map_group2bk34[32+18] =
{
0, 1, 2, 3, 4, 5, 6, 6, 7, (NEGATE_IPD_MASK | 2), (NEGATE_IPD_MASK | 1), (NEGATE_IPD_MASK | 0),
10, 10, 4, 5, 6, 7, 8, 9,
10, 11, 12, 9,
14, 11, 12, 13,
14, 15, 16, 13,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33
};
/* type definitions */
typedef struct
{
uint8_t frame_len;
uint8_t resolution20[3];
uint8_t resolution34[5];
qmf_t *work;
qmf_t **buffer;
qmf_t **temp;
} hyb_info;
/* static function declarations */
static void ps_data_decode(ps_info *ps);
static hyb_info *hybrid_init(uint8_t numTimeSlotsRate);
static void channel_filter2(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid);
static void INLINE DCT3_4_unscaled(real_t *y, real_t *x);
static void channel_filter8(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid);
static void hybrid_analysis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32],
uint8_t use34, uint8_t numTimeSlotsRate);
static void hybrid_synthesis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32],
uint8_t use34, uint8_t numTimeSlotsRate);
static int8_t delta_clip(int8_t i, int8_t min, int8_t max);
static void delta_decode(uint8_t enable, int8_t *index, int8_t *index_prev,
uint8_t dt_flag, uint8_t nr_par, uint8_t stride,
int8_t min_index, int8_t max_index);
static void delta_modulo_decode(uint8_t enable, int8_t *index, int8_t *index_prev,
uint8_t dt_flag, uint8_t nr_par, uint8_t stride,
int8_t and_modulo);
static void map20indexto34(int8_t *index, uint8_t bins);
#ifdef PS_LOW_POWER
static void map34indexto20(int8_t *index, uint8_t bins);
#endif
static void ps_data_decode(ps_info *ps);
static void ps_decorrelate(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64],
qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]);
static void ps_mix_phase(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64],
qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32]);
/* */
static hyb_info *hybrid_init(uint8_t numTimeSlotsRate)
{
uint8_t i;
hyb_info *hyb = (hyb_info*)faad_malloc(sizeof(hyb_info));
hyb->resolution34[0] = 12;
hyb->resolution34[1] = 8;
hyb->resolution34[2] = 4;
hyb->resolution34[3] = 4;
hyb->resolution34[4] = 4;
hyb->resolution20[0] = 8;
hyb->resolution20[1] = 2;
hyb->resolution20[2] = 2;
hyb->frame_len = numTimeSlotsRate;
hyb->work = (qmf_t*)faad_malloc((hyb->frame_len+12) * sizeof(qmf_t));
memset(hyb->work, 0, (hyb->frame_len+12) * sizeof(qmf_t));
hyb->buffer = (qmf_t**)faad_malloc(5 * sizeof(qmf_t*));
for (i = 0; i < 5; i++)
{
hyb->buffer[i] = (qmf_t*)faad_malloc(hyb->frame_len * sizeof(qmf_t));
memset(hyb->buffer[i], 0, hyb->frame_len * sizeof(qmf_t));
}
hyb->temp = (qmf_t**)faad_malloc(hyb->frame_len * sizeof(qmf_t*));
for (i = 0; i < hyb->frame_len; i++)
{
hyb->temp[i] = (qmf_t*)faad_malloc(12 /*max*/ * sizeof(qmf_t));
}
return hyb;
}
static void hybrid_free(hyb_info *hyb)
{
uint8_t i;
if (!hyb) return;
if (hyb->work)
faad_free(hyb->work);
for (i = 0; i < 5; i++)
{
if (hyb->buffer[i])
faad_free(hyb->buffer[i]);
}
if (hyb->buffer)
faad_free(hyb->buffer);
for (i = 0; i < hyb->frame_len; i++)
{
if (hyb->temp[i])
faad_free(hyb->temp[i]);
}
if (hyb->temp)
faad_free(hyb->temp);
faad_free(hyb);
}
/* real filter, size 2 */
static void channel_filter2(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid)
{
uint8_t i;
for (i = 0; i < frame_len; i++)
{
real_t r0 = MUL_F(filter[0],(QMF_RE(buffer[0+i]) + QMF_RE(buffer[12+i])));
real_t r1 = MUL_F(filter[1],(QMF_RE(buffer[1+i]) + QMF_RE(buffer[11+i])));
real_t r2 = MUL_F(filter[2],(QMF_RE(buffer[2+i]) + QMF_RE(buffer[10+i])));
real_t r3 = MUL_F(filter[3],(QMF_RE(buffer[3+i]) + QMF_RE(buffer[9+i])));
real_t r4 = MUL_F(filter[4],(QMF_RE(buffer[4+i]) + QMF_RE(buffer[8+i])));
real_t r5 = MUL_F(filter[5],(QMF_RE(buffer[5+i]) + QMF_RE(buffer[7+i])));
real_t r6 = MUL_F(filter[6],QMF_RE(buffer[6+i]));
real_t i0 = MUL_F(filter[0],(QMF_IM(buffer[0+i]) + QMF_IM(buffer[12+i])));
real_t i1 = MUL_F(filter[1],(QMF_IM(buffer[1+i]) + QMF_IM(buffer[11+i])));
real_t i2 = MUL_F(filter[2],(QMF_IM(buffer[2+i]) + QMF_IM(buffer[10+i])));
real_t i3 = MUL_F(filter[3],(QMF_IM(buffer[3+i]) + QMF_IM(buffer[9+i])));
real_t i4 = MUL_F(filter[4],(QMF_IM(buffer[4+i]) + QMF_IM(buffer[8+i])));
real_t i5 = MUL_F(filter[5],(QMF_IM(buffer[5+i]) + QMF_IM(buffer[7+i])));
real_t i6 = MUL_F(filter[6],QMF_IM(buffer[6+i]));
/* q = 0 */
QMF_RE(X_hybrid[i][0]) = r0 + r1 + r2 + r3 + r4 + r5 + r6;
QMF_IM(X_hybrid[i][0]) = i0 + i1 + i2 + i3 + i4 + i5 + i6;
/* q = 1 */
QMF_RE(X_hybrid[i][1]) = r0 - r1 + r2 - r3 + r4 - r5 + r6;
QMF_IM(X_hybrid[i][1]) = i0 - i1 + i2 - i3 + i4 - i5 + i6;
}
}
/* complex filter, size 4 */
static void channel_filter4(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid)
{
uint8_t i;
real_t input_re1[2], input_re2[2], input_im1[2], input_im2[2];
for (i = 0; i < frame_len; i++)
{
input_re1[0] = -MUL_F(filter[2], (QMF_RE(buffer[i+2]) + QMF_RE(buffer[i+10]))) +
MUL_F(filter[6], QMF_RE(buffer[i+6]));
input_re1[1] = MUL_F(FRAC_CONST(-0.70710678118655),
(MUL_F(filter[1], (QMF_RE(buffer[i+1]) + QMF_RE(buffer[i+11]))) +
MUL_F(filter[3], (QMF_RE(buffer[i+3]) + QMF_RE(buffer[i+9]))) -
MUL_F(filter[5], (QMF_RE(buffer[i+5]) + QMF_RE(buffer[i+7])))));
input_im1[0] = MUL_F(filter[0], (QMF_IM(buffer[i+0]) - QMF_IM(buffer[i+12]))) -
MUL_F(filter[4], (QMF_IM(buffer[i+4]) - QMF_IM(buffer[i+8])));
input_im1[1] = MUL_F(FRAC_CONST(0.70710678118655),
(MUL_F(filter[1], (QMF_IM(buffer[i+1]) - QMF_IM(buffer[i+11]))) -
MUL_F(filter[3], (QMF_IM(buffer[i+3]) - QMF_IM(buffer[i+9]))) -
MUL_F(filter[5], (QMF_IM(buffer[i+5]) - QMF_IM(buffer[i+7])))));
input_re2[0] = MUL_F(filter[0], (QMF_RE(buffer[i+0]) - QMF_RE(buffer[i+12]))) -
MUL_F(filter[4], (QMF_RE(buffer[i+4]) - QMF_RE(buffer[i+8])));
input_re2[1] = MUL_F(FRAC_CONST(0.70710678118655),
(MUL_F(filter[1], (QMF_RE(buffer[i+1]) - QMF_RE(buffer[i+11]))) -
MUL_F(filter[3], (QMF_RE(buffer[i+3]) - QMF_RE(buffer[i+9]))) -
MUL_F(filter[5], (QMF_RE(buffer[i+5]) - QMF_RE(buffer[i+7])))));
input_im2[0] = -MUL_F(filter[2], (QMF_IM(buffer[i+2]) + QMF_IM(buffer[i+10]))) +
MUL_F(filter[6], QMF_IM(buffer[i+6]));
input_im2[1] = MUL_F(FRAC_CONST(-0.70710678118655),
(MUL_F(filter[1], (QMF_IM(buffer[i+1]) + QMF_IM(buffer[i+11]))) +
MUL_F(filter[3], (QMF_IM(buffer[i+3]) + QMF_IM(buffer[i+9]))) -
MUL_F(filter[5], (QMF_IM(buffer[i+5]) + QMF_IM(buffer[i+7])))));
/* q == 0 */
QMF_RE(X_hybrid[i][0]) = input_re1[0] + input_re1[1] + input_im1[0] + input_im1[1];
QMF_IM(X_hybrid[i][0]) = -input_re2[0] - input_re2[1] + input_im2[0] + input_im2[1];
/* q == 1 */
QMF_RE(X_hybrid[i][1]) = input_re1[0] - input_re1[1] - input_im1[0] + input_im1[1];
QMF_IM(X_hybrid[i][1]) = input_re2[0] - input_re2[1] + input_im2[0] - input_im2[1];
/* q == 2 */
QMF_RE(X_hybrid[i][2]) = input_re1[0] - input_re1[1] + input_im1[0] - input_im1[1];
QMF_IM(X_hybrid[i][2]) = -input_re2[0] + input_re2[1] + input_im2[0] - input_im2[1];
/* q == 3 */
QMF_RE(X_hybrid[i][3]) = input_re1[0] + input_re1[1] - input_im1[0] - input_im1[1];
QMF_IM(X_hybrid[i][3]) = input_re2[0] + input_re2[1] + input_im2[0] + input_im2[1];
}
}
static void INLINE DCT3_4_unscaled(real_t *y, real_t *x)
{
real_t f0, f1, f2, f3, f4, f5, f6, f7, f8;
f0 = MUL_F(x[2], FRAC_CONST(0.7071067811865476));
f1 = x[0] - f0;
f2 = x[0] + f0;
f3 = x[1] + x[3];
f4 = MUL_C(x[1], COEF_CONST(1.3065629648763766));
f5 = MUL_F(f3, FRAC_CONST(-0.9238795325112866));
f6 = MUL_F(x[3], FRAC_CONST(-0.5411961001461967));
f7 = f4 + f5;
f8 = f6 - f5;
y[3] = f2 - f8;
y[0] = f2 + f8;
y[2] = f1 - f7;
y[1] = f1 + f7;
}
/* complex filter, size 8 */
static void channel_filter8(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid)
{
uint8_t i, n;
real_t input_re1[4], input_re2[4], input_im1[4], input_im2[4];
real_t x[4];
for (i = 0; i < frame_len; i++)
{
input_re1[0] = MUL_F(filter[6],QMF_RE(buffer[6+i]));
input_re1[1] = MUL_F(filter[5],(QMF_RE(buffer[5+i]) + QMF_RE(buffer[7+i])));
input_re1[2] = -MUL_F(filter[0],(QMF_RE(buffer[0+i]) + QMF_RE(buffer[12+i]))) + MUL_F(filter[4],(QMF_RE(buffer[4+i]) + QMF_RE(buffer[8+i])));
input_re1[3] = -MUL_F(filter[1],(QMF_RE(buffer[1+i]) + QMF_RE(buffer[11+i]))) + MUL_F(filter[3],(QMF_RE(buffer[3+i]) + QMF_RE(buffer[9+i])));
input_im1[0] = MUL_F(filter[5],(QMF_IM(buffer[7+i]) - QMF_IM(buffer[5+i])));
input_im1[1] = MUL_F(filter[0],(QMF_IM(buffer[12+i]) - QMF_IM(buffer[0+i]))) + MUL_F(filter[4],(QMF_IM(buffer[8+i]) - QMF_IM(buffer[4+i])));
input_im1[2] = MUL_F(filter[1],(QMF_IM(buffer[11+i]) - QMF_IM(buffer[1+i]))) + MUL_F(filter[3],(QMF_IM(buffer[9+i]) - QMF_IM(buffer[3+i])));
input_im1[3] = MUL_F(filter[2],(QMF_IM(buffer[10+i]) - QMF_IM(buffer[2+i])));
for (n = 0; n < 4; n++)
{
x[n] = input_re1[n] - input_im1[3-n];
}
DCT3_4_unscaled(x, x);
QMF_RE(X_hybrid[i][7]) = x[0];
QMF_RE(X_hybrid[i][5]) = x[2];
QMF_RE(X_hybrid[i][3]) = x[3];
QMF_RE(X_hybrid[i][1]) = x[1];
for (n = 0; n < 4; n++)
{
x[n] = input_re1[n] + input_im1[3-n];
}
DCT3_4_unscaled(x, x);
QMF_RE(X_hybrid[i][6]) = x[1];
QMF_RE(X_hybrid[i][4]) = x[3];
QMF_RE(X_hybrid[i][2]) = x[2];
QMF_RE(X_hybrid[i][0]) = x[0];
input_im2[0] = MUL_F(filter[6],QMF_IM(buffer[6+i]));
input_im2[1] = MUL_F(filter[5],(QMF_IM(buffer[5+i]) + QMF_IM(buffer[7+i])));
input_im2[2] = -MUL_F(filter[0],(QMF_IM(buffer[0+i]) + QMF_IM(buffer[12+i]))) + MUL_F(filter[4],(QMF_IM(buffer[4+i]) + QMF_IM(buffer[8+i])));
input_im2[3] = -MUL_F(filter[1],(QMF_IM(buffer[1+i]) + QMF_IM(buffer[11+i]))) + MUL_F(filter[3],(QMF_IM(buffer[3+i]) + QMF_IM(buffer[9+i])));
input_re2[0] = MUL_F(filter[5],(QMF_RE(buffer[7+i]) - QMF_RE(buffer[5+i])));
input_re2[1] = MUL_F(filter[0],(QMF_RE(buffer[12+i]) - QMF_RE(buffer[0+i]))) + MUL_F(filter[4],(QMF_RE(buffer[8+i]) - QMF_RE(buffer[4+i])));
input_re2[2] = MUL_F(filter[1],(QMF_RE(buffer[11+i]) - QMF_RE(buffer[1+i]))) + MUL_F(filter[3],(QMF_RE(buffer[9+i]) - QMF_RE(buffer[3+i])));
input_re2[3] = MUL_F(filter[2],(QMF_RE(buffer[10+i]) - QMF_RE(buffer[2+i])));
for (n = 0; n < 4; n++)
{
x[n] = input_im2[n] + input_re2[3-n];
}
DCT3_4_unscaled(x, x);
QMF_IM(X_hybrid[i][7]) = x[0];
QMF_IM(X_hybrid[i][5]) = x[2];
QMF_IM(X_hybrid[i][3]) = x[3];
QMF_IM(X_hybrid[i][1]) = x[1];
for (n = 0; n < 4; n++)
{
x[n] = input_im2[n] - input_re2[3-n];
}
DCT3_4_unscaled(x, x);
QMF_IM(X_hybrid[i][6]) = x[1];
QMF_IM(X_hybrid[i][4]) = x[3];
QMF_IM(X_hybrid[i][2]) = x[2];
QMF_IM(X_hybrid[i][0]) = x[0];
}
}
static void INLINE DCT3_6_unscaled(real_t *y, real_t *x)
{
real_t f0, f1, f2, f3, f4, f5, f6, f7;
f0 = MUL_F(x[3], FRAC_CONST(0.70710678118655));
f1 = x[0] + f0;
f2 = x[0] - f0;
f3 = MUL_F((x[1] - x[5]), FRAC_CONST(0.70710678118655));
f4 = MUL_F(x[2], FRAC_CONST(0.86602540378444)) + MUL_F(x[4], FRAC_CONST(0.5));
f5 = f4 - x[4];
f6 = MUL_F(x[1], FRAC_CONST(0.96592582628907)) + MUL_F(x[5], FRAC_CONST(0.25881904510252));
f7 = f6 - f3;
y[0] = f1 + f6 + f4;
y[1] = f2 + f3 - x[4];
y[2] = f7 + f2 - f5;
y[3] = f1 - f7 - f5;
y[4] = f1 - f3 - x[4];
y[5] = f2 - f6 + f4;
}
/* complex filter, size 12 */
static void channel_filter12(hyb_info *hyb, uint8_t frame_len, const real_t *filter,
qmf_t *buffer, qmf_t **X_hybrid)
{
uint8_t i, n;
real_t input_re1[6], input_re2[6], input_im1[6], input_im2[6];
real_t out_re1[6], out_re2[6], out_im1[6], out_im2[6];
for (i = 0; i < frame_len; i++)
{
for (n = 0; n < 6; n++)
{
if (n == 0)
{
input_re1[0] = MUL_F(QMF_RE(buffer[6+i]), filter[6]);
input_re2[0] = MUL_F(QMF_IM(buffer[6+i]), filter[6]);
} else {
input_re1[6-n] = MUL_F((QMF_RE(buffer[n+i]) + QMF_RE(buffer[12-n+i])), filter[n]);
input_re2[6-n] = MUL_F((QMF_IM(buffer[n+i]) + QMF_IM(buffer[12-n+i])), filter[n]);
}
input_im2[n] = MUL_F((QMF_RE(buffer[n+i]) - QMF_RE(buffer[12-n+i])), filter[n]);
input_im1[n] = MUL_F((QMF_IM(buffer[n+i]) - QMF_IM(buffer[12-n+i])), filter[n]);
}
DCT3_6_unscaled(out_re1, input_re1);
DCT3_6_unscaled(out_re2, input_re2);
DCT3_6_unscaled(out_im1, input_im1);
DCT3_6_unscaled(out_im2, input_im2);
for (n = 0; n < 6; n += 2)
{
QMF_RE(X_hybrid[i][n]) = out_re1[n] - out_im1[n];
QMF_IM(X_hybrid[i][n]) = out_re2[n] + out_im2[n];
QMF_RE(X_hybrid[i][n+1]) = out_re1[n+1] + out_im1[n+1];
QMF_IM(X_hybrid[i][n+1]) = out_re2[n+1] - out_im2[n+1];
QMF_RE(X_hybrid[i][10-n]) = out_re1[n+1] - out_im1[n+1];
QMF_IM(X_hybrid[i][10-n]) = out_re2[n+1] + out_im2[n+1];
QMF_RE(X_hybrid[i][11-n]) = out_re1[n] + out_im1[n];
QMF_IM(X_hybrid[i][11-n]) = out_re2[n] - out_im2[n];
}
}
}
/* Hybrid analysis: further split up QMF subbands
* to improve frequency resolution
*/
static void hybrid_analysis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32],
uint8_t use34, uint8_t numTimeSlotsRate)
{
uint8_t k, n, band;
uint8_t offset = 0;
uint8_t qmf_bands = (use34) ? 5 : 3;
uint8_t *resolution = (use34) ? hyb->resolution34 : hyb->resolution20;
for (band = 0; band < qmf_bands; band++)
{
/* build working buffer */
memcpy(hyb->work, hyb->buffer[band], 12 * sizeof(qmf_t));
/* add new samples */
for (n = 0; n < hyb->frame_len; n++)
{
QMF_RE(hyb->work[12 + n]) = QMF_RE(X[n + 6 /*delay*/][band]);
QMF_IM(hyb->work[12 + n]) = QMF_IM(X[n + 6 /*delay*/][band]);
}
/* store samples */
memcpy(hyb->buffer[band], hyb->work + hyb->frame_len, 12 * sizeof(qmf_t));
switch(resolution[band])
{
case 2:
/* Type B real filter, Q[p] = 2 */
channel_filter2(hyb, hyb->frame_len, p2_13_20, hyb->work, hyb->temp);
break;
case 4:
/* Type A complex filter, Q[p] = 4 */
channel_filter4(hyb, hyb->frame_len, p4_13_34, hyb->work, hyb->temp);
break;
case 8:
/* Type A complex filter, Q[p] = 8 */
channel_filter8(hyb, hyb->frame_len, (use34) ? p8_13_34 : p8_13_20,
hyb->work, hyb->temp);
break;
case 12:
/* Type A complex filter, Q[p] = 12 */
channel_filter12(hyb, hyb->frame_len, p12_13_34, hyb->work, hyb->temp);
break;
}
for (n = 0; n < hyb->frame_len; n++)
{
for (k = 0; k < resolution[band]; k++)
{
QMF_RE(X_hybrid[n][offset + k]) = QMF_RE(hyb->temp[n][k]);
QMF_IM(X_hybrid[n][offset + k]) = QMF_IM(hyb->temp[n][k]);
}
}
offset += resolution[band];
}
/* group hybrid channels */
if (!use34)
{
for (n = 0; n < numTimeSlotsRate; n++)
{
QMF_RE(X_hybrid[n][3]) += QMF_RE(X_hybrid[n][4]);
QMF_IM(X_hybrid[n][3]) += QMF_IM(X_hybrid[n][4]);
QMF_RE(X_hybrid[n][4]) = 0;
QMF_IM(X_hybrid[n][4]) = 0;
QMF_RE(X_hybrid[n][2]) += QMF_RE(X_hybrid[n][5]);
QMF_IM(X_hybrid[n][2]) += QMF_IM(X_hybrid[n][5]);
QMF_RE(X_hybrid[n][5]) = 0;
QMF_IM(X_hybrid[n][5]) = 0;
}
}
}
static void hybrid_synthesis(hyb_info *hyb, qmf_t X[32][64], qmf_t X_hybrid[32][32],
uint8_t use34, uint8_t numTimeSlotsRate)
{
uint8_t k, n, band;
uint8_t offset = 0;
uint8_t qmf_bands = (use34) ? 5 : 3;
uint8_t *resolution = (use34) ? hyb->resolution34 : hyb->resolution20;
for(band = 0; band < qmf_bands; band++)
{
for (n = 0; n < hyb->frame_len; n++)
{
QMF_RE(X[n][band]) = 0;
QMF_IM(X[n][band]) = 0;
for (k = 0; k < resolution[band]; k++)
{
QMF_RE(X[n][band]) += QMF_RE(X_hybrid[n][offset + k]);
QMF_IM(X[n][band]) += QMF_IM(X_hybrid[n][offset + k]);
}
}
offset += resolution[band];
}
}
/* limits the value i to the range [min,max] */
static int8_t delta_clip(int8_t i, int8_t min, int8_t max)
{
if (i < min)
return min;
else if (i > max)
return max;
else
return i;
}
//int iid = 0;
/* delta decode array */
static void delta_decode(uint8_t enable, int8_t *index, int8_t *index_prev,
uint8_t dt_flag, uint8_t nr_par, uint8_t stride,
int8_t min_index, int8_t max_index)
{
int8_t i;
if (enable == 1)
{
if (dt_flag == 0)
{
/* delta coded in frequency direction */
index[0] = 0 + index[0];
index[0] = delta_clip(index[0], min_index, max_index);
for (i = 1; i < nr_par; i++)
{
index[i] = index[i-1] + index[i];
index[i] = delta_clip(index[i], min_index, max_index);
}
} else {
/* delta coded in time direction */
for (i = 0; i < nr_par; i++)
{
//int8_t tmp2;
//int8_t tmp = index[i];
//printf("%d %d\n", index_prev[i*stride], index[i]);
//printf("%d\n", index[i]);
index[i] = index_prev[i*stride] + index[i];
//tmp2 = index[i];
index[i] = delta_clip(index[i], min_index, max_index);
//if (iid)
//{
// if (index[i] == 7)
// {
// printf("%d %d %d\n", index_prev[i*stride], tmp, tmp2);
// }
//}
}
}
} else {
/* set indices to zero */
for (i = 0; i < nr_par; i++)
{
index[i] = 0;
}
}
/* coarse */
if (stride == 2)
{
for (i = (nr_par<<1)-1; i > 0; i--)
{
index[i] = index[i>>1];
}
}
}
/* delta modulo decode array */
/* in: log2 value of the modulo value to allow using AND instead of MOD */
static void delta_modulo_decode(uint8_t enable, int8_t *index, int8_t *index_prev,
uint8_t dt_flag, uint8_t nr_par, uint8_t stride,
int8_t and_modulo)
{
int8_t i;
if (enable == 1)
{
if (dt_flag == 0)
{
/* delta coded in frequency direction */
index[0] = 0 + index[0];
index[0] &= and_modulo;
for (i = 1; i < nr_par; i++)
{
index[i] = index[i-1] + index[i];
index[i] &= and_modulo;
}
} else {
/* delta coded in time direction */
for (i = 0; i < nr_par; i++)
{
index[i] = index_prev[i*stride] + index[i];
index[i] &= and_modulo;
}
}
} else {
/* set indices to zero */
for (i = 0; i < nr_par; i++)
{
index[i] = 0;
}
}
/* coarse */
if (stride == 2)
{
index[0] = 0;
for (i = (nr_par<<1)-1; i > 0; i--)
{
index[i] = index[i>>1];
}
}
}
#ifdef PS_LOW_POWER
static void map34indexto20(int8_t *index, uint8_t bins)
{
index[0] = (2*index[0]+index[1])/3;
index[1] = (index[1]+2*index[2])/3;
index[2] = (2*index[3]+index[4])/3;
index[3] = (index[4]+2*index[5])/3;
index[4] = (index[6]+index[7])/2;
index[5] = (index[8]+index[9])/2;
index[6] = index[10];
index[7] = index[11];
index[8] = (index[12]+index[13])/2;
index[9] = (index[14]+index[15])/2;
index[10] = index[16];
if (bins == 34)
{
index[11] = index[17];
index[12] = index[18];
index[13] = index[19];
index[14] = (index[20]+index[21])/2;
index[15] = (index[22]+index[23])/2;
index[16] = (index[24]+index[25])/2;
index[17] = (index[26]+index[27])/2;
index[18] = (index[28]+index[29]+index[30]+index[31])/4;
index[19] = (index[32]+index[33])/2;
}
}
#endif
static void map20indexto34(int8_t *index, uint8_t bins)
{
index[0] = index[0];
index[1] = (index[0] + index[1])/2;
index[2] = index[1];
index[3] = index[2];
index[4] = (index[2] + index[3])/2;
index[5] = index[3];
index[6] = index[4];
index[7] = index[4];
index[8] = index[5];
index[9] = index[5];
index[10] = index[6];
index[11] = index[7];
index[12] = index[8];
index[13] = index[8];
index[14] = index[9];
index[15] = index[9];
index[16] = index[10];
if (bins == 34)
{
index[17] = index[11];
index[18] = index[12];
index[19] = index[13];
index[20] = index[14];
index[21] = index[14];
index[22] = index[15];
index[23] = index[15];
index[24] = index[16];
index[25] = index[16];
index[26] = index[17];
index[27] = index[17];
index[28] = index[18];
index[29] = index[18];
index[30] = index[18];
index[31] = index[18];
index[32] = index[19];
index[33] = index[19];
}
}
/* parse the bitstream data decoded in ps_data() */
static void ps_data_decode(ps_info *ps)
{
uint8_t env, bin;
/* ps data not available, use data from previous frame */
if (ps->ps_data_available == 0)
{
ps->num_env = 0;
}
for (env = 0; env < ps->num_env; env++)
{
int8_t *iid_index_prev;
int8_t *icc_index_prev;
int8_t *ipd_index_prev;
int8_t *opd_index_prev;
int8_t num_iid_steps = (ps->iid_mode < 3) ? 7 : 15 /*fine quant*/;
if (env == 0)
{
/* take last envelope from previous frame */
iid_index_prev = ps->iid_index_prev;
icc_index_prev = ps->icc_index_prev;
ipd_index_prev = ps->ipd_index_prev;
opd_index_prev = ps->opd_index_prev;
} else {
/* take index values from previous envelope */
iid_index_prev = ps->iid_index[env - 1];
icc_index_prev = ps->icc_index[env - 1];
ipd_index_prev = ps->ipd_index[env - 1];
opd_index_prev = ps->opd_index[env - 1];
}
// iid = 1;
/* delta decode iid parameters */
delta_decode(ps->enable_iid, ps->iid_index[env], iid_index_prev,
ps->iid_dt[env], ps->nr_iid_par,
(ps->iid_mode == 0 || ps->iid_mode == 3) ? 2 : 1,
-num_iid_steps, num_iid_steps);
// iid = 0;
/* delta decode icc parameters */
delta_decode(ps->enable_icc, ps->icc_index[env], icc_index_prev,
ps->icc_dt[env], ps->nr_icc_par,
(ps->icc_mode == 0 || ps->icc_mode == 3) ? 2 : 1,
0, 7);
/* delta modulo decode ipd parameters */
delta_modulo_decode(ps->enable_ipdopd, ps->ipd_index[env], ipd_index_prev,
ps->ipd_dt[env], ps->nr_ipdopd_par, 1, 7);
/* delta modulo decode opd parameters */
delta_modulo_decode(ps->enable_ipdopd, ps->opd_index[env], opd_index_prev,
ps->opd_dt[env], ps->nr_ipdopd_par, 1, 7);
}
/* handle error case */
if (ps->num_env == 0)
{
/* force to 1 */
ps->num_env = 1;
if (ps->enable_iid)
{
for (bin = 0; bin < 34; bin++)
ps->iid_index[0][bin] = ps->iid_index_prev[bin];
} else {
for (bin = 0; bin < 34; bin++)
ps->iid_index[0][bin] = 0;
}
if (ps->enable_icc)
{
for (bin = 0; bin < 34; bin++)
ps->icc_index[0][bin] = ps->icc_index_prev[bin];
} else {
for (bin = 0; bin < 34; bin++)
ps->icc_index[0][bin] = 0;
}
if (ps->enable_ipdopd)
{
for (bin = 0; bin < 17; bin++)
{
ps->ipd_index[0][bin] = ps->ipd_index_prev[bin];
ps->opd_index[0][bin] = ps->opd_index_prev[bin];
}
} else {
for (bin = 0; bin < 17; bin++)
{
ps->ipd_index[0][bin] = 0;
ps->opd_index[0][bin] = 0;
}
}
}
/* update previous indices */
for (bin = 0; bin < 34; bin++)
ps->iid_index_prev[bin] = ps->iid_index[ps->num_env-1][bin];
for (bin = 0; bin < 34; bin++)
ps->icc_index_prev[bin] = ps->icc_index[ps->num_env-1][bin];
for (bin = 0; bin < 17; bin++)
{
ps->ipd_index_prev[bin] = ps->ipd_index[ps->num_env-1][bin];
ps->opd_index_prev[bin] = ps->opd_index[ps->num_env-1][bin];
}
ps->ps_data_available = 0;
if (ps->frame_class == 0)
{
ps->border_position[0] = 0;
for (env = 1; env < ps->num_env; env++)
{
ps->border_position[env] = (env * ps->numTimeSlotsRate) / ps->num_env;
}
ps->border_position[ps->num_env] = ps->numTimeSlotsRate;
} else {
ps->border_position[0] = 0;
if (ps->border_position[ps->num_env] < ps->numTimeSlotsRate)
{
for (bin = 0; bin < 34; bin++)
{
ps->iid_index[ps->num_env][bin] = ps->iid_index[ps->num_env-1][bin];
ps->icc_index[ps->num_env][bin] = ps->icc_index[ps->num_env-1][bin];
}
for (bin = 0; bin < 17; bin++)
{
ps->ipd_index[ps->num_env][bin] = ps->ipd_index[ps->num_env-1][bin];
ps->opd_index[ps->num_env][bin] = ps->opd_index[ps->num_env-1][bin];
}
ps->num_env++;
ps->border_position[ps->num_env] = ps->numTimeSlotsRate;
}
for (env = 1; env < ps->num_env; env++)
{
int8_t thr = ps->numTimeSlotsRate - (ps->num_env - env);
if (ps->border_position[env] > thr)
{
ps->border_position[env] = thr;
} else {
thr = ps->border_position[env-1]+1;
if (ps->border_position[env] < thr)
{
ps->border_position[env] = thr;
}
}
}
}
/* make sure that the indices of all parameters can be mapped
* to the same hybrid synthesis filterbank
*/
#ifdef PS_LOW_POWER
for (env = 0; env < ps->num_env; env++)
{
if (ps->iid_mode == 2 || ps->iid_mode == 5)
map34indexto20(ps->iid_index[env], 34);
if (ps->icc_mode == 2 || ps->icc_mode == 5)
map34indexto20(ps->icc_index[env], 34);
/* disable ipd/opd */
for (bin = 0; bin < 17; bin++)
{
ps->aaIpdIndex[env][bin] = 0;
ps->aaOpdIndex[env][bin] = 0;
}
}
#else
if (ps->use34hybrid_bands)
{
for (env = 0; env < ps->num_env; env++)
{
if (ps->iid_mode != 2 && ps->iid_mode != 5)
map20indexto34(ps->iid_index[env], 34);
if (ps->icc_mode != 2 && ps->icc_mode != 5)
map20indexto34(ps->icc_index[env], 34);
if (ps->ipd_mode != 2 && ps->ipd_mode != 5)
{
map20indexto34(ps->ipd_index[env], 17);
map20indexto34(ps->opd_index[env], 17);
}
}
}
#endif
#if 0
for (env = 0; env < ps->num_env; env++)
{
printf("iid[env:%d]:", env);
for (bin = 0; bin < 34; bin++)
{
printf(" %d", ps->iid_index[env][bin]);
}
printf("\n");
}
for (env = 0; env < ps->num_env; env++)
{
printf("icc[env:%d]:", env);
for (bin = 0; bin < 34; bin++)
{
printf(" %d", ps->icc_index[env][bin]);
}
printf("\n");
}
for (env = 0; env < ps->num_env; env++)
{
printf("ipd[env:%d]:", env);
for (bin = 0; bin < 17; bin++)
{
printf(" %d", ps->ipd_index[env][bin]);
}
printf("\n");
}
for (env = 0; env < ps->num_env; env++)
{
printf("opd[env:%d]:", env);
for (bin = 0; bin < 17; bin++)
{
printf(" %d", ps->opd_index[env][bin]);
}
printf("\n");
}
printf("\n");
#endif
}
/* decorrelate the mono signal using an allpass filter */
static void ps_decorrelate(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64],
qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32])
{
uint8_t gr, n, m, bk;
uint8_t temp_delay;
uint8_t sb, maxsb;
const complex_t *Phi_Fract_SubQmf;
uint8_t temp_delay_ser[NO_ALLPASS_LINKS];
real_t P_SmoothPeakDecayDiffNrg, nrg;
real_t P[32][34];
real_t G_TransientRatio[32][34] = {{0}};
complex_t inputLeft;
/* chose hybrid filterbank: 20 or 34 band case */
if (ps->use34hybrid_bands)
{
Phi_Fract_SubQmf = Phi_Fract_SubQmf34;
} else{
Phi_Fract_SubQmf = Phi_Fract_SubQmf20;
}
/* clear the energy values */
for (n = 0; n < 32; n++)
{
for (bk = 0; bk < 34; bk++)
{
P[n][bk] = 0;
}
}
/* calculate the energy in each parameter band b(k) */
for (gr = 0; gr < ps->num_groups; gr++)
{
/* select the parameter index b(k) to which this group belongs */
bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr];
/* select the upper subband border for this group */
maxsb = (gr < ps->num_hybrid_groups) ? ps->group_border[gr]+1 : ps->group_border[gr+1];
for (sb = ps->group_border[gr]; sb < maxsb; sb++)
{
for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++)
{
#ifdef FIXED_POINT
uint32_t in_re, in_im;
#endif
/* input from hybrid subbands or QMF subbands */
if (gr < ps->num_hybrid_groups)
{
RE(inputLeft) = QMF_RE(X_hybrid_left[n][sb]);
IM(inputLeft) = QMF_IM(X_hybrid_left[n][sb]);
} else {
RE(inputLeft) = QMF_RE(X_left[n][sb]);
IM(inputLeft) = QMF_IM(X_left[n][sb]);
}
/* accumulate energy */
#ifdef FIXED_POINT
/* NOTE: all input is scaled by 2^(-5) because of fixed point QMF
* meaning that P will be scaled by 2^(-10) compared to floating point version
*/
in_re = ((abs(RE(inputLeft))+(1<<(REAL_BITS-1)))>>REAL_BITS);
in_im = ((abs(IM(inputLeft))+(1<<(REAL_BITS-1)))>>REAL_BITS);
P[n][bk] += in_re*in_re + in_im*in_im;
#else
P[n][bk] += MUL_R(RE(inputLeft),RE(inputLeft)) + MUL_R(IM(inputLeft),IM(inputLeft));
#endif
}
}
}
#if 0
for (n = 0; n < 32; n++)
{
for (bk = 0; bk < 34; bk++)
{
#ifdef FIXED_POINT
printf("%d %d: %d\n", n, bk, P[n][bk] /*/(float)REAL_PRECISION*/);
#else
printf("%d %d: %f\n", n, bk, P[n][bk]/1024.0);
#endif
}
}
#endif
/* calculate transient reduction ratio for each parameter band b(k) */
for (bk = 0; bk < ps->nr_par_bands; bk++)
{
for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++)
{
const real_t gamma = COEF_CONST(1.5);
ps->P_PeakDecayNrg[bk] = MUL_F(ps->P_PeakDecayNrg[bk], ps->alpha_decay);
if (ps->P_PeakDecayNrg[bk] < P[n][bk])
ps->P_PeakDecayNrg[bk] = P[n][bk];
/* apply smoothing filter to peak decay energy */
P_SmoothPeakDecayDiffNrg = ps->P_SmoothPeakDecayDiffNrg_prev[bk];
P_SmoothPeakDecayDiffNrg += MUL_F((ps->P_PeakDecayNrg[bk] - P[n][bk] - ps->P_SmoothPeakDecayDiffNrg_prev[bk]), ps->alpha_smooth);
ps->P_SmoothPeakDecayDiffNrg_prev[bk] = P_SmoothPeakDecayDiffNrg;
/* apply smoothing filter to energy */
nrg = ps->P_prev[bk];
nrg += MUL_F((P[n][bk] - ps->P_prev[bk]), ps->alpha_smooth);
ps->P_prev[bk] = nrg;
/* calculate transient ratio */
if (MUL_C(P_SmoothPeakDecayDiffNrg, gamma) <= nrg)
{
G_TransientRatio[n][bk] = REAL_CONST(1.0);
} else {
G_TransientRatio[n][bk] = DIV_R(nrg, (MUL_C(P_SmoothPeakDecayDiffNrg, gamma)));
}
}
}
#if 0
for (n = 0; n < 32; n++)
{
for (bk = 0; bk < 34; bk++)
{
#ifdef FIXED_POINT
printf("%d %d: %f\n", n, bk, G_TransientRatio[n][bk]/(float)REAL_PRECISION);
#else
printf("%d %d: %f\n", n, bk, G_TransientRatio[n][bk]);
#endif
}
}
#endif
/* apply stereo decorrelation filter to the signal */
for (gr = 0; gr < ps->num_groups; gr++)
{
if (gr < ps->num_hybrid_groups)
maxsb = ps->group_border[gr] + 1;
else
maxsb = ps->group_border[gr + 1];
/* QMF channel */
for (sb = ps->group_border[gr]; sb < maxsb; sb++)
{
real_t g_DecaySlope;
real_t g_DecaySlope_filt[NO_ALLPASS_LINKS];
/* g_DecaySlope: [0..1] */
if (gr < ps->num_hybrid_groups || sb <= ps->decay_cutoff)
{
g_DecaySlope = FRAC_CONST(1.0);
} else {
int8_t decay = ps->decay_cutoff - sb;
if (decay <= -20 /* -1/DECAY_SLOPE */)
{
g_DecaySlope = 0;
} else {
/* decay(int)*decay_slope(frac) = g_DecaySlope(frac) */
g_DecaySlope = FRAC_CONST(1.0) + DECAY_SLOPE * decay;
}
}
/* calculate g_DecaySlope_filt for every m multiplied by filter_a[m] */
for (m = 0; m < NO_ALLPASS_LINKS; m++)
{
g_DecaySlope_filt[m] = MUL_F(g_DecaySlope, filter_a[m]);
}
/* set delay indices */
temp_delay = ps->saved_delay;
for (n = 0; n < NO_ALLPASS_LINKS; n++)
temp_delay_ser[n] = ps->delay_buf_index_ser[n];
for (n = ps->border_position[0]; n < ps->border_position[ps->num_env]; n++)
{
complex_t tmp, tmp0, R0;
if (gr < ps->num_hybrid_groups)
{
/* hybrid filterbank input */
RE(inputLeft) = QMF_RE(X_hybrid_left[n][sb]);
IM(inputLeft) = QMF_IM(X_hybrid_left[n][sb]);
} else {
/* QMF filterbank input */
RE(inputLeft) = QMF_RE(X_left[n][sb]);
IM(inputLeft) = QMF_IM(X_left[n][sb]);
}
if (sb > ps->nr_allpass_bands && gr >= ps->num_hybrid_groups)
{
/* delay */
/* never hybrid subbands here, always QMF subbands */
RE(tmp) = RE(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]);
IM(tmp) = IM(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]);
RE(R0) = RE(tmp);
IM(R0) = IM(tmp);
RE(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]) = RE(inputLeft);
IM(ps->delay_Qmf[ps->delay_buf_index_delay[sb]][sb]) = IM(inputLeft);
} else {
/* allpass filter */
uint8_t m;
complex_t Phi_Fract;
/* fetch parameters */
if (gr < ps->num_hybrid_groups)
{
/* select data from the hybrid subbands */
RE(tmp0) = RE(ps->delay_SubQmf[temp_delay][sb]);
IM(tmp0) = IM(ps->delay_SubQmf[temp_delay][sb]);
RE(ps->delay_SubQmf[temp_delay][sb]) = RE(inputLeft);
IM(ps->delay_SubQmf[temp_delay][sb]) = IM(inputLeft);
RE(Phi_Fract) = RE(Phi_Fract_SubQmf[sb]);
IM(Phi_Fract) = IM(Phi_Fract_SubQmf[sb]);
} else {
/* select data from the QMF subbands */
RE(tmp0) = RE(ps->delay_Qmf[temp_delay][sb]);
IM(tmp0) = IM(ps->delay_Qmf[temp_delay][sb]);
RE(ps->delay_Qmf[temp_delay][sb]) = RE(inputLeft);
IM(ps->delay_Qmf[temp_delay][sb]) = IM(inputLeft);
RE(Phi_Fract) = RE(Phi_Fract_Qmf[sb]);
IM(Phi_Fract) = IM(Phi_Fract_Qmf[sb]);
}
/* z^(-2) * Phi_Fract[k] */
ComplexMult(&RE(tmp), &IM(tmp), RE(tmp0), IM(tmp0), RE(Phi_Fract), IM(Phi_Fract));
RE(R0) = RE(tmp);
IM(R0) = IM(tmp);
for (m = 0; m < NO_ALLPASS_LINKS; m++)
{
complex_t Q_Fract_allpass, tmp2;
/* fetch parameters */
if (gr < ps->num_hybrid_groups)
{
/* select data from the hybrid subbands */
RE(tmp0) = RE(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]);
IM(tmp0) = IM(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]);
if (ps->use34hybrid_bands)
{
RE(Q_Fract_allpass) = RE(Q_Fract_allpass_SubQmf34[sb][m]);
IM(Q_Fract_allpass) = IM(Q_Fract_allpass_SubQmf34[sb][m]);
} else {
RE(Q_Fract_allpass) = RE(Q_Fract_allpass_SubQmf20[sb][m]);
IM(Q_Fract_allpass) = IM(Q_Fract_allpass_SubQmf20[sb][m]);
}
} else {
/* select data from the QMF subbands */
RE(tmp0) = RE(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]);
IM(tmp0) = IM(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]);
RE(Q_Fract_allpass) = RE(Q_Fract_allpass_Qmf[sb][m]);
IM(Q_Fract_allpass) = IM(Q_Fract_allpass_Qmf[sb][m]);
}
/* delay by a fraction */
/* z^(-d(m)) * Q_Fract_allpass[k,m] */
ComplexMult(&RE(tmp), &IM(tmp), RE(tmp0), IM(tmp0), RE(Q_Fract_allpass), IM(Q_Fract_allpass));
/* -a(m) * g_DecaySlope[k] */
RE(tmp) += -MUL_F(g_DecaySlope_filt[m], RE(R0));
IM(tmp) += -MUL_F(g_DecaySlope_filt[m], IM(R0));
/* -a(m) * g_DecaySlope[k] * Q_Fract_allpass[k,m] * z^(-d(m)) */
RE(tmp2) = RE(R0) + MUL_F(g_DecaySlope_filt[m], RE(tmp));
IM(tmp2) = IM(R0) + MUL_F(g_DecaySlope_filt[m], IM(tmp));
/* store sample */
if (gr < ps->num_hybrid_groups)
{
RE(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]) = RE(tmp2);
IM(ps->delay_SubQmf_ser[m][temp_delay_ser[m]][sb]) = IM(tmp2);
} else {
RE(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]) = RE(tmp2);
IM(ps->delay_Qmf_ser[m][temp_delay_ser[m]][sb]) = IM(tmp2);
}
/* store for next iteration (or as output value if last iteration) */
RE(R0) = RE(tmp);
IM(R0) = IM(tmp);
}
}
/* select b(k) for reading the transient ratio */
bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr];
/* duck if a past transient is found */
RE(R0) = MUL_R(G_TransientRatio[n][bk], RE(R0));
IM(R0) = MUL_R(G_TransientRatio[n][bk], IM(R0));
if (gr < ps->num_hybrid_groups)
{
/* hybrid */
QMF_RE(X_hybrid_right[n][sb]) = RE(R0);
QMF_IM(X_hybrid_right[n][sb]) = IM(R0);
} else {
/* QMF */
QMF_RE(X_right[n][sb]) = RE(R0);
QMF_IM(X_right[n][sb]) = IM(R0);
}
/* Update delay buffer index */
if (++temp_delay >= 2)
{
temp_delay = 0;
}
/* update delay indices */
if (sb > ps->nr_allpass_bands && gr >= ps->num_hybrid_groups)
{
/* delay_D depends on the samplerate, it can hold the values 14 and 1 */
if (++ps->delay_buf_index_delay[sb] >= ps->delay_D[sb])
{
ps->delay_buf_index_delay[sb] = 0;
}
}
for (m = 0; m < NO_ALLPASS_LINKS; m++)
{
if (++temp_delay_ser[m] >= ps->num_sample_delay_ser[m])
{
temp_delay_ser[m] = 0;
}
}
}
}
}
/* update delay indices */
ps->saved_delay = temp_delay;
for (m = 0; m < NO_ALLPASS_LINKS; m++)
ps->delay_buf_index_ser[m] = temp_delay_ser[m];
}
#ifdef FIXED_POINT
#define step(shift) \
if ((0x40000000l >> shift) + root <= value) \
{ \
value -= (0x40000000l >> shift) + root; \
root = (root >> 1) | (0x40000000l >> shift); \
} else { \
root = root >> 1; \
}
/* fixed point square root approximation */
static real_t ps_sqrt(real_t value)
{
real_t root = 0;
step( 0); step( 2); step( 4); step( 6);
step( 8); step(10); step(12); step(14);
step(16); step(18); step(20); step(22);
step(24); step(26); step(28); step(30);
if (root < value)
++root;
root <<= (REAL_BITS/2);
return root;
}
#else
#define ps_sqrt(A) sqrt(A)
#endif
static const real_t ipdopd_cos_tab[] = {
FRAC_CONST(1.000000000000000),
FRAC_CONST(0.707106781186548),
FRAC_CONST(0.000000000000000),
FRAC_CONST(-0.707106781186547),
FRAC_CONST(-1.000000000000000),
FRAC_CONST(-0.707106781186548),
FRAC_CONST(-0.000000000000000),
FRAC_CONST(0.707106781186547),
FRAC_CONST(1.000000000000000)
};
static const real_t ipdopd_sin_tab[] = {
FRAC_CONST(0.000000000000000),
FRAC_CONST(0.707106781186547),
FRAC_CONST(1.000000000000000),
FRAC_CONST(0.707106781186548),
FRAC_CONST(0.000000000000000),
FRAC_CONST(-0.707106781186547),
FRAC_CONST(-1.000000000000000),
FRAC_CONST(-0.707106781186548),
FRAC_CONST(-0.000000000000000)
};
static real_t magnitude_c(complex_t c)
{
#ifdef FIXED_POINT
#define ps_abs(A) (((A) > 0) ? (A) : (-(A)))
#define ALPHA FRAC_CONST(0.948059448969)
#define BETA FRAC_CONST(0.392699081699)
real_t abs_inphase = ps_abs(RE(c));
real_t abs_quadrature = ps_abs(IM(c));
if (abs_inphase > abs_quadrature) {
return MUL_F(abs_inphase, ALPHA) + MUL_F(abs_quadrature, BETA);
} else {
return MUL_F(abs_quadrature, ALPHA) + MUL_F(abs_inphase, BETA);
}
#else
return sqrt(RE(c)*RE(c) + IM(c)*IM(c));
#endif
}
static void ps_mix_phase(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64],
qmf_t X_hybrid_left[32][32], qmf_t X_hybrid_right[32][32])
{
uint8_t n;
uint8_t gr;
uint8_t bk = 0;
uint8_t sb, maxsb;
uint8_t env;
uint8_t nr_ipdopd_par;
complex_t h11, h12, h21, h22;
complex_t H11, H12, H21, H22;
complex_t deltaH11, deltaH12, deltaH21, deltaH22;
complex_t tempLeft;
complex_t tempRight;
complex_t phaseLeft;
complex_t phaseRight;
real_t L;
const real_t *sf_iid;
uint8_t no_iid_steps;
if (ps->iid_mode >= 3)
{
no_iid_steps = 15;
sf_iid = sf_iid_fine;
} else {
no_iid_steps = 7;
sf_iid = sf_iid_normal;
}
if (ps->ipd_mode == 0 || ps->ipd_mode == 3)
{
nr_ipdopd_par = 11; /* resolution */
} else {
nr_ipdopd_par = ps->nr_ipdopd_par;
}
for (gr = 0; gr < ps->num_groups; gr++)
{
bk = (~NEGATE_IPD_MASK) & ps->map_group2bk[gr];
/* use one channel per group in the subqmf domain */
maxsb = (gr < ps->num_hybrid_groups) ? ps->group_border[gr] + 1 : ps->group_border[gr + 1];
for (env = 0; env < ps->num_env; env++)
{
if (ps->icc_mode < 3)
{
/* type 'A' mixing as described in 8.6.4.6.2.1 */
real_t c_1, c_2;
real_t cosa, sina;
real_t cosb, sinb;
real_t ab1, ab2;
real_t ab3, ab4;
/*
c_1 = sqrt(2.0 / (1.0 + pow(10.0, quant_iid[no_iid_steps + iid_index] / 10.0)));
c_2 = sqrt(2.0 / (1.0 + pow(10.0, quant_iid[no_iid_steps - iid_index] / 10.0)));
alpha = 0.5 * acos(quant_rho[icc_index]);
beta = alpha * ( c_1 - c_2 ) / sqrt(2.0);
*/
/* index range is supposed to be -7...7 or -15...15 depending on iid_mode
(Table 8.24, ISO/IEC 14496-3:2005).
if it is outside these boundaries, this is most likely an error. sanitize
it and try to process further. */
if (ps->iid_index[env][bk] < -no_iid_steps) {
fprintf(stderr, "Warning: invalid iid_index: %d < %d\n", ps->iid_index[env][bk],
-no_iid_steps);
ps->iid_index[env][bk] = -no_iid_steps;
} else if (ps->iid_index[env][bk] > no_iid_steps) {
fprintf(stderr, "Warning: invalid iid_index: %d > %d\n", ps->iid_index[env][bk],
no_iid_steps);
ps->iid_index[env][bk] = no_iid_steps;
}
/* calculate the scalefactors c_1 and c_2 from the intensity differences */
c_1 = sf_iid[no_iid_steps + ps->iid_index[env][bk]];
c_2 = sf_iid[no_iid_steps - ps->iid_index[env][bk]];
/* calculate alpha and beta using the ICC parameters */
cosa = cos_alphas[ps->icc_index[env][bk]];
sina = sin_alphas[ps->icc_index[env][bk]];
if (ps->iid_mode >= 3)
{
if (ps->iid_index[env][bk] < 0)
{
cosb = cos_betas_fine[-ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sinb = -sin_betas_fine[-ps->iid_index[env][bk]][ps->icc_index[env][bk]];
} else {
cosb = cos_betas_fine[ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sinb = sin_betas_fine[ps->iid_index[env][bk]][ps->icc_index[env][bk]];
}
} else {
if (ps->iid_index[env][bk] < 0)
{
cosb = cos_betas_normal[-ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sinb = -sin_betas_normal[-ps->iid_index[env][bk]][ps->icc_index[env][bk]];
} else {
cosb = cos_betas_normal[ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sinb = sin_betas_normal[ps->iid_index[env][bk]][ps->icc_index[env][bk]];
}
}
ab1 = MUL_C(cosb, cosa);
ab2 = MUL_C(sinb, sina);
ab3 = MUL_C(sinb, cosa);
ab4 = MUL_C(cosb, sina);
/* h_xy: COEF */
RE(h11) = MUL_C(c_2, (ab1 - ab2));
RE(h12) = MUL_C(c_1, (ab1 + ab2));
RE(h21) = MUL_C(c_2, (ab3 + ab4));
RE(h22) = MUL_C(c_1, (ab3 - ab4));
} else {
/* type 'B' mixing as described in 8.6.4.6.2.2 */
real_t sina, cosa;
real_t cosg, sing;
/*
real_t c, rho, mu, alpha, gamma;
uint8_t i;
i = ps->iid_index[env][bk];
c = (real_t)pow(10.0, ((i)?(((i>0)?1:-1)*quant_iid[((i>0)?i:-i)-1]):0.)/20.0);
rho = quant_rho[ps->icc_index[env][bk]];
if (rho == 0.0f && c == 1.)
{
alpha = (real_t)M_PI/4.0f;
rho = 0.05f;
} else {
if (rho <= 0.05f)
{
rho = 0.05f;
}
alpha = 0.5f*(real_t)atan( (2.0f*c*rho) / (c*c-1.0f) );
if (alpha < 0.)
{
alpha += (real_t)M_PI/2.0f;
}
if (rho < 0.)
{
alpha += (real_t)M_PI;
}
}
mu = c+1.0f/c;
mu = 1+(4.0f*rho*rho-4.0f)/(mu*mu);
gamma = (real_t)atan(sqrt((1.0f-sqrt(mu))/(1.0f+sqrt(mu))));
*/
if (ps->iid_mode >= 3)
{
uint8_t abs_iid = abs(ps->iid_index[env][bk]);
cosa = sincos_alphas_B_fine[no_iid_steps + ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sina = sincos_alphas_B_fine[30 - (no_iid_steps + ps->iid_index[env][bk])][ps->icc_index[env][bk]];
cosg = cos_gammas_fine[abs_iid][ps->icc_index[env][bk]];
sing = sin_gammas_fine[abs_iid][ps->icc_index[env][bk]];
} else {
uint8_t abs_iid = abs(ps->iid_index[env][bk]);
cosa = sincos_alphas_B_normal[no_iid_steps + ps->iid_index[env][bk]][ps->icc_index[env][bk]];
sina = sincos_alphas_B_normal[14 - (no_iid_steps + ps->iid_index[env][bk])][ps->icc_index[env][bk]];
cosg = cos_gammas_normal[abs_iid][ps->icc_index[env][bk]];
sing = sin_gammas_normal[abs_iid][ps->icc_index[env][bk]];
}
RE(h11) = MUL_C(COEF_SQRT2, MUL_C(cosa, cosg));
RE(h12) = MUL_C(COEF_SQRT2, MUL_C(sina, cosg));
RE(h21) = MUL_C(COEF_SQRT2, MUL_C(-cosa, sing));
RE(h22) = MUL_C(COEF_SQRT2, MUL_C(sina, sing));
}
/* calculate phase rotation parameters H_xy */
/* note that the imaginary part of these parameters are only calculated when
IPD and OPD are enabled
*/
if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par))
{
int8_t i;
real_t xy, pq, xypq;
/* ringbuffer index */
i = ps->phase_hist;
/* previous value */
#ifdef FIXED_POINT
/* divide by 4, shift right 2 bits */
RE(tempLeft) = RE(ps->ipd_prev[bk][i]) >> 2;
IM(tempLeft) = IM(ps->ipd_prev[bk][i]) >> 2;
RE(tempRight) = RE(ps->opd_prev[bk][i]) >> 2;
IM(tempRight) = IM(ps->opd_prev[bk][i]) >> 2;
#else
RE(tempLeft) = MUL_F(RE(ps->ipd_prev[bk][i]), FRAC_CONST(0.25));
IM(tempLeft) = MUL_F(IM(ps->ipd_prev[bk][i]), FRAC_CONST(0.25));
RE(tempRight) = MUL_F(RE(ps->opd_prev[bk][i]), FRAC_CONST(0.25));
IM(tempRight) = MUL_F(IM(ps->opd_prev[bk][i]), FRAC_CONST(0.25));
#endif
/* save current value */
RE(ps->ipd_prev[bk][i]) = ipdopd_cos_tab[abs(ps->ipd_index[env][bk])];
IM(ps->ipd_prev[bk][i]) = ipdopd_sin_tab[abs(ps->ipd_index[env][bk])];
RE(ps->opd_prev[bk][i]) = ipdopd_cos_tab[abs(ps->opd_index[env][bk])];
IM(ps->opd_prev[bk][i]) = ipdopd_sin_tab[abs(ps->opd_index[env][bk])];
/* add current value */
RE(tempLeft) += RE(ps->ipd_prev[bk][i]);
IM(tempLeft) += IM(ps->ipd_prev[bk][i]);
RE(tempRight) += RE(ps->opd_prev[bk][i]);
IM(tempRight) += IM(ps->opd_prev[bk][i]);
/* ringbuffer index */
if (i == 0)
{
i = 2;
}
i--;
/* get value before previous */
#ifdef FIXED_POINT
/* dividing by 2, shift right 1 bit */
RE(tempLeft) += (RE(ps->ipd_prev[bk][i]) >> 1);
IM(tempLeft) += (IM(ps->ipd_prev[bk][i]) >> 1);
RE(tempRight) += (RE(ps->opd_prev[bk][i]) >> 1);
IM(tempRight) += (IM(ps->opd_prev[bk][i]) >> 1);
#else
RE(tempLeft) += MUL_F(RE(ps->ipd_prev[bk][i]), FRAC_CONST(0.5));
IM(tempLeft) += MUL_F(IM(ps->ipd_prev[bk][i]), FRAC_CONST(0.5));
RE(tempRight) += MUL_F(RE(ps->opd_prev[bk][i]), FRAC_CONST(0.5));
IM(tempRight) += MUL_F(IM(ps->opd_prev[bk][i]), FRAC_CONST(0.5));
#endif
#if 0 /* original code */
ipd = (float)atan2(IM(tempLeft), RE(tempLeft));
opd = (float)atan2(IM(tempRight), RE(tempRight));
/* phase rotation */
RE(phaseLeft) = (float)cos(opd);
IM(phaseLeft) = (float)sin(opd);
opd -= ipd;
RE(phaseRight) = (float)cos(opd);
IM(phaseRight) = (float)sin(opd);
#else
// x = IM(tempLeft)
// y = RE(tempLeft)
// p = IM(tempRight)
// q = RE(tempRight)
// cos(atan2(x,y)) = y/sqrt((x*x) + (y*y))
// sin(atan2(x,y)) = x/sqrt((x*x) + (y*y))
// cos(atan2(x,y)-atan2(p,q)) = (y*q + x*p) / ( sqrt((x*x) + (y*y)) * sqrt((p*p) + (q*q)) );
// sin(atan2(x,y)-atan2(p,q)) = (x*q - y*p) / ( sqrt((x*x) + (y*y)) * sqrt((p*p) + (q*q)) );
xy = magnitude_c(tempRight);
pq = magnitude_c(tempLeft);
if (xy != 0)
{
RE(phaseLeft) = DIV_R(RE(tempRight), xy);
IM(phaseLeft) = DIV_R(IM(tempRight), xy);
} else {
RE(phaseLeft) = 0;
IM(phaseLeft) = 0;
}
xypq = MUL_R(xy, pq);
if (xypq != 0)
{
real_t tmp1 = MUL_R(RE(tempRight), RE(tempLeft)) + MUL_R(IM(tempRight), IM(tempLeft));
real_t tmp2 = MUL_R(IM(tempRight), RE(tempLeft)) - MUL_R(RE(tempRight), IM(tempLeft));
RE(phaseRight) = DIV_R(tmp1, xypq);
IM(phaseRight) = DIV_R(tmp2, xypq);
} else {
RE(phaseRight) = 0;
IM(phaseRight) = 0;
}
#endif
/* MUL_F(COEF, REAL) = COEF */
IM(h11) = MUL_R(RE(h11), IM(phaseLeft));
IM(h12) = MUL_R(RE(h12), IM(phaseRight));
IM(h21) = MUL_R(RE(h21), IM(phaseLeft));
IM(h22) = MUL_R(RE(h22), IM(phaseRight));
RE(h11) = MUL_R(RE(h11), RE(phaseLeft));
RE(h12) = MUL_R(RE(h12), RE(phaseRight));
RE(h21) = MUL_R(RE(h21), RE(phaseLeft));
RE(h22) = MUL_R(RE(h22), RE(phaseRight));
}
/* length of the envelope n_e+1 - n_e (in time samples) */
/* 0 < L <= 32: integer */
L = (real_t)(ps->border_position[env + 1] - ps->border_position[env]);
/* obtain final H_xy by means of linear interpolation */
RE(deltaH11) = (RE(h11) - RE(ps->h11_prev[gr])) / L;
RE(deltaH12) = (RE(h12) - RE(ps->h12_prev[gr])) / L;
RE(deltaH21) = (RE(h21) - RE(ps->h21_prev[gr])) / L;
RE(deltaH22) = (RE(h22) - RE(ps->h22_prev[gr])) / L;
RE(H11) = RE(ps->h11_prev[gr]);
RE(H12) = RE(ps->h12_prev[gr]);
RE(H21) = RE(ps->h21_prev[gr]);
RE(H22) = RE(ps->h22_prev[gr]);
RE(ps->h11_prev[gr]) = RE(h11);
RE(ps->h12_prev[gr]) = RE(h12);
RE(ps->h21_prev[gr]) = RE(h21);
RE(ps->h22_prev[gr]) = RE(h22);
/* only calculate imaginary part when needed */
if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par))
{
/* obtain final H_xy by means of linear interpolation */
IM(deltaH11) = (IM(h11) - IM(ps->h11_prev[gr])) / L;
IM(deltaH12) = (IM(h12) - IM(ps->h12_prev[gr])) / L;
IM(deltaH21) = (IM(h21) - IM(ps->h21_prev[gr])) / L;
IM(deltaH22) = (IM(h22) - IM(ps->h22_prev[gr])) / L;
IM(H11) = IM(ps->h11_prev[gr]);
IM(H12) = IM(ps->h12_prev[gr]);
IM(H21) = IM(ps->h21_prev[gr]);
IM(H22) = IM(ps->h22_prev[gr]);
if ((NEGATE_IPD_MASK & ps->map_group2bk[gr]) != 0)
{
IM(deltaH11) = -IM(deltaH11);
IM(deltaH12) = -IM(deltaH12);
IM(deltaH21) = -IM(deltaH21);
IM(deltaH22) = -IM(deltaH22);
IM(H11) = -IM(H11);
IM(H12) = -IM(H12);
IM(H21) = -IM(H21);
IM(H22) = -IM(H22);
}
IM(ps->h11_prev[gr]) = IM(h11);
IM(ps->h12_prev[gr]) = IM(h12);
IM(ps->h21_prev[gr]) = IM(h21);
IM(ps->h22_prev[gr]) = IM(h22);
}
/* apply H_xy to the current envelope band of the decorrelated subband */
for (n = ps->border_position[env]; n < ps->border_position[env + 1]; n++)
{
/* addition finalises the interpolation over every n */
RE(H11) += RE(deltaH11);
RE(H12) += RE(deltaH12);
RE(H21) += RE(deltaH21);
RE(H22) += RE(deltaH22);
if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par))
{
IM(H11) += IM(deltaH11);
IM(H12) += IM(deltaH12);
IM(H21) += IM(deltaH21);
IM(H22) += IM(deltaH22);
}
/* channel is an alias to the subband */
for (sb = ps->group_border[gr]; sb < maxsb; sb++)
{
complex_t inLeft, inRight;
/* load decorrelated samples */
if (gr < ps->num_hybrid_groups)
{
RE(inLeft) = RE(X_hybrid_left[n][sb]);
IM(inLeft) = IM(X_hybrid_left[n][sb]);
RE(inRight) = RE(X_hybrid_right[n][sb]);
IM(inRight) = IM(X_hybrid_right[n][sb]);
} else {
RE(inLeft) = RE(X_left[n][sb]);
IM(inLeft) = IM(X_left[n][sb]);
RE(inRight) = RE(X_right[n][sb]);
IM(inRight) = IM(X_right[n][sb]);
}
/* apply mixing */
RE(tempLeft) = MUL_C(RE(H11), RE(inLeft)) + MUL_C(RE(H21), RE(inRight));
IM(tempLeft) = MUL_C(RE(H11), IM(inLeft)) + MUL_C(RE(H21), IM(inRight));
RE(tempRight) = MUL_C(RE(H12), RE(inLeft)) + MUL_C(RE(H22), RE(inRight));
IM(tempRight) = MUL_C(RE(H12), IM(inLeft)) + MUL_C(RE(H22), IM(inRight));
/* only perform imaginary operations when needed */
if ((ps->enable_ipdopd) && (bk < nr_ipdopd_par))
{
/* apply rotation */
RE(tempLeft) -= MUL_C(IM(H11), IM(inLeft)) + MUL_C(IM(H21), IM(inRight));
IM(tempLeft) += MUL_C(IM(H11), RE(inLeft)) + MUL_C(IM(H21), RE(inRight));
RE(tempRight) -= MUL_C(IM(H12), IM(inLeft)) + MUL_C(IM(H22), IM(inRight));
IM(tempRight) += MUL_C(IM(H12), RE(inLeft)) + MUL_C(IM(H22), RE(inRight));
}
/* store final samples */
if (gr < ps->num_hybrid_groups)
{
RE(X_hybrid_left[n][sb]) = RE(tempLeft);
IM(X_hybrid_left[n][sb]) = IM(tempLeft);
RE(X_hybrid_right[n][sb]) = RE(tempRight);
IM(X_hybrid_right[n][sb]) = IM(tempRight);
} else {
RE(X_left[n][sb]) = RE(tempLeft);
IM(X_left[n][sb]) = IM(tempLeft);
RE(X_right[n][sb]) = RE(tempRight);
IM(X_right[n][sb]) = IM(tempRight);
}
}
}
/* shift phase smoother's circular buffer index */
ps->phase_hist++;
if (ps->phase_hist == 2)
{
ps->phase_hist = 0;
}
}
}
}
void ps_free(ps_info *ps)
{
/* free hybrid filterbank structures */
hybrid_free(ps->hyb);
faad_free(ps);
}
ps_info *ps_init(uint8_t sr_index, uint8_t numTimeSlotsRate)
{
uint8_t i;
uint8_t short_delay_band;
ps_info *ps = (ps_info*)faad_malloc(sizeof(ps_info));
memset(ps, 0, sizeof(ps_info));
ps->hyb = hybrid_init(numTimeSlotsRate);
ps->numTimeSlotsRate = numTimeSlotsRate;
ps->ps_data_available = 0;
/* delay stuff*/
ps->saved_delay = 0;
for (i = 0; i < 64; i++)
{
ps->delay_buf_index_delay[i] = 0;
}
for (i = 0; i < NO_ALLPASS_LINKS; i++)
{
ps->delay_buf_index_ser[i] = 0;
#ifdef PARAM_32KHZ
if (sr_index <= 5) /* >= 32 kHz*/
{
ps->num_sample_delay_ser[i] = delay_length_d[1][i];
} else {
ps->num_sample_delay_ser[i] = delay_length_d[0][i];
}
#else
/* THESE ARE CONSTANTS NOW */
ps->num_sample_delay_ser[i] = delay_length_d[i];
#endif
}
#ifdef PARAM_32KHZ
if (sr_index <= 5) /* >= 32 kHz*/
{
short_delay_band = 35;
ps->nr_allpass_bands = 22;
ps->alpha_decay = FRAC_CONST(0.76592833836465);
ps->alpha_smooth = FRAC_CONST(0.25);
} else {
short_delay_band = 64;
ps->nr_allpass_bands = 45;
ps->alpha_decay = FRAC_CONST(0.58664621951003);
ps->alpha_smooth = FRAC_CONST(0.6);
}
#else
/* THESE ARE CONSTANTS NOW */
short_delay_band = 35;
ps->nr_allpass_bands = 22;
ps->alpha_decay = FRAC_CONST(0.76592833836465);
ps->alpha_smooth = FRAC_CONST(0.25);
#endif
/* THESE ARE CONSTANT NOW IF PS IS INDEPENDANT OF SAMPLERATE */
for (i = 0; i < short_delay_band; i++)
{
ps->delay_D[i] = 14;
}
for (i = short_delay_band; i < 64; i++)
{
ps->delay_D[i] = 1;
}
/* mixing and phase */
for (i = 0; i < 50; i++)
{
RE(ps->h11_prev[i]) = 1;
IM(ps->h12_prev[i]) = 1;
RE(ps->h11_prev[i]) = 1;
IM(ps->h12_prev[i]) = 1;
}
ps->phase_hist = 0;
for (i = 0; i < 20; i++)
{
RE(ps->ipd_prev[i][0]) = 0;
IM(ps->ipd_prev[i][0]) = 0;
RE(ps->ipd_prev[i][1]) = 0;
IM(ps->ipd_prev[i][1]) = 0;
RE(ps->opd_prev[i][0]) = 0;
IM(ps->opd_prev[i][0]) = 0;
RE(ps->opd_prev[i][1]) = 0;
IM(ps->opd_prev[i][1]) = 0;
}
return ps;
}
/* main Parametric Stereo decoding function */
uint8_t ps_decode(ps_info *ps, qmf_t X_left[38][64], qmf_t X_right[38][64])
{
qmf_t X_hybrid_left[32][32] = {{0}};
qmf_t X_hybrid_right[32][32] = {{0}};
/* delta decoding of the bitstream data */
ps_data_decode(ps);
/* set up some parameters depending on filterbank type */
if (ps->use34hybrid_bands)
{
ps->group_border = (uint8_t*)group_border34;
ps->map_group2bk = (uint16_t*)map_group2bk34;
ps->num_groups = 32+18;
ps->num_hybrid_groups = 32;
ps->nr_par_bands = 34;
ps->decay_cutoff = 5;
} else {
ps->group_border = (uint8_t*)group_border20;
ps->map_group2bk = (uint16_t*)map_group2bk20;
ps->num_groups = 10+12;
ps->num_hybrid_groups = 10;
ps->nr_par_bands = 20;
ps->decay_cutoff = 3;
}
/* Perform further analysis on the lowest subbands to get a higher
* frequency resolution
*/
hybrid_analysis((hyb_info*)ps->hyb, X_left, X_hybrid_left,
ps->use34hybrid_bands, ps->numTimeSlotsRate);
/* decorrelate mono signal */
ps_decorrelate(ps, X_left, X_right, X_hybrid_left, X_hybrid_right);
/* apply mixing and phase parameters */
ps_mix_phase(ps, X_left, X_right, X_hybrid_left, X_hybrid_right);
/* hybrid synthesis, to rebuild the SBR QMF matrices */
hybrid_synthesis((hyb_info*)ps->hyb, X_left, X_hybrid_left,
ps->use34hybrid_bands, ps->numTimeSlotsRate);
hybrid_synthesis((hyb_info*)ps->hyb, X_right, X_hybrid_right,
ps->use34hybrid_bands, ps->numTimeSlotsRate);
return 0;
}
#endif