Coverage Report

Created: 2026-07-10 07:01

next uncovered line (L), next uncovered region (R), next uncovered branch (B)
/proc/self/cwd/libfaad/is.c
Line
Count
Source
1
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
3
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** The "appropriate copyright message" mentioned in section 2c of the GPLv2
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** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
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**
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** $Id: is.c,v 1.28 2007/11/01 12:33:31 menno Exp $
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**/
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31
#include "common.h"
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#include "structs.h"
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#include "syntax.h"
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#include "is.h"
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#ifdef FIXED_POINT
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static real_t pow05_table[] = {
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    COEF_CONST(1.0),              /* 0.5^( 0/4) */
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    COEF_CONST(0.84089641525371), /* 0.5^(+1/4) */
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    COEF_CONST(0.70710678118655), /* 0.5^(+2/4) */
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    COEF_CONST(0.59460355750136)  /* 0.5^(+3/4) */
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};
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#endif
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46
void is_decode(ic_stream *ics, ic_stream *icsr, real_t *l_spec, real_t *r_spec,
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               uint16_t frame_len)
48
71.2k
{
49
71.2k
    uint8_t g, sfb, b;
50
71.2k
    uint16_t i;
51
71.2k
    real_t scale;
52
#ifdef FIXED_POINT
53
    int32_t exp, frac;
54
#endif
55
56
71.2k
    uint16_t nshort = frame_len/8;
57
71.2k
    uint8_t group = 0;
58
59
217k
    for (g = 0; g < icsr->num_window_groups; g++)
60
146k
    {
61
        /* Do intensity stereo decoding */
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314k
        for (b = 0; b < icsr->window_group_length[g]; b++)
63
168k
        {
64
353k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
65
184k
            {
66
184k
                if (is_intensity(icsr, g, sfb))
67
22.6k
                {
68
22.6k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
69
#ifdef MAIN_DEC
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                    /* For scalefactor bands coded in intensity stereo the
71
                       corresponding predictors in the right channel are
72
                       switched to "off".
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                     */
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                    ics->pred.prediction_used[sfb] = 0;
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                    icsr->pred.prediction_used[sfb] = 0;
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#endif
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78
#ifndef FIXED_POINT
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15.3k
                    scale_factor = min(max(scale_factor, -120), 120);
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                    scale = (real_t)pow(0.5, (0.25*scale_factor));
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#else
82
7.31k
                    scale_factor = min(max(scale_factor, -60), 60);
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                    exp = scale_factor >> 2; /* exp is -15..15 */
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                    frac = scale_factor & 3;
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                    scale = pow05_table[frac];
86
7.31k
                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
87
7.31k
                    if (exp < 0)
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612
                        scale <<= -exp;
89
6.70k
                    else
90
6.70k
                        scale >>= exp;
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#endif
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93
                    /* Scale from left to right channel,
94
                       do not touch left channel */
95
174k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
96
151k
                    {
97
151k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
98
151k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
99
50.5k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
100
151k
                    }
101
22.6k
                }
102
184k
            }
103
168k
            group++;
104
168k
        }
105
146k
    }
106
71.2k
}
is_decode
Line
Count
Source
48
24.7k
{
49
24.7k
    uint8_t g, sfb, b;
50
24.7k
    uint16_t i;
51
24.7k
    real_t scale;
52
24.7k
#ifdef FIXED_POINT
53
24.7k
    int32_t exp, frac;
54
24.7k
#endif
55
56
24.7k
    uint16_t nshort = frame_len/8;
57
24.7k
    uint8_t group = 0;
58
59
79.8k
    for (g = 0; g < icsr->num_window_groups; g++)
60
55.0k
    {
61
        /* Do intensity stereo decoding */
62
118k
        for (b = 0; b < icsr->window_group_length[g]; b++)
63
63.7k
        {
64
135k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
65
72.2k
            {
66
72.2k
                if (is_intensity(icsr, g, sfb))
67
7.31k
                {
68
7.31k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
69
#ifdef MAIN_DEC
70
                    /* For scalefactor bands coded in intensity stereo the
71
                       corresponding predictors in the right channel are
72
                       switched to "off".
73
                     */
74
                    ics->pred.prediction_used[sfb] = 0;
75
                    icsr->pred.prediction_used[sfb] = 0;
76
#endif
77
78
#ifndef FIXED_POINT
79
                    scale_factor = min(max(scale_factor, -120), 120);
80
                    scale = (real_t)pow(0.5, (0.25*scale_factor));
81
#else
82
7.31k
                    scale_factor = min(max(scale_factor, -60), 60);
83
7.31k
                    exp = scale_factor >> 2; /* exp is -15..15 */
84
7.31k
                    frac = scale_factor & 3;
85
7.31k
                    scale = pow05_table[frac];
86
7.31k
                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
87
7.31k
                    if (exp < 0)
88
612
                        scale <<= -exp;
89
6.70k
                    else
90
6.70k
                        scale >>= exp;
91
7.31k
#endif
92
93
                    /* Scale from left to right channel,
94
                       do not touch left channel */
95
53.6k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
96
46.3k
                    {
97
46.3k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
98
46.3k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
99
15.8k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
100
46.3k
                    }
101
7.31k
                }
102
72.2k
            }
103
63.7k
            group++;
104
63.7k
        }
105
55.0k
    }
106
24.7k
}
is_decode
Line
Count
Source
48
46.4k
{
49
46.4k
    uint8_t g, sfb, b;
50
46.4k
    uint16_t i;
51
46.4k
    real_t scale;
52
#ifdef FIXED_POINT
53
    int32_t exp, frac;
54
#endif
55
56
46.4k
    uint16_t nshort = frame_len/8;
57
46.4k
    uint8_t group = 0;
58
59
137k
    for (g = 0; g < icsr->num_window_groups; g++)
60
91.3k
    {
61
        /* Do intensity stereo decoding */
62
196k
        for (b = 0; b < icsr->window_group_length[g]; b++)
63
104k
        {
64
217k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
65
112k
            {
66
112k
                if (is_intensity(icsr, g, sfb))
67
15.3k
                {
68
15.3k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
69
15.3k
#ifdef MAIN_DEC
70
                    /* For scalefactor bands coded in intensity stereo the
71
                       corresponding predictors in the right channel are
72
                       switched to "off".
73
                     */
74
15.3k
                    ics->pred.prediction_used[sfb] = 0;
75
15.3k
                    icsr->pred.prediction_used[sfb] = 0;
76
15.3k
#endif
77
78
15.3k
#ifndef FIXED_POINT
79
15.3k
                    scale_factor = min(max(scale_factor, -120), 120);
80
15.3k
                    scale = (real_t)pow(0.5, (0.25*scale_factor));
81
#else
82
                    scale_factor = min(max(scale_factor, -60), 60);
83
                    exp = scale_factor >> 2; /* exp is -15..15 */
84
                    frac = scale_factor & 3;
85
                    scale = pow05_table[frac];
86
                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
87
                    if (exp < 0)
88
                        scale <<= -exp;
89
                    else
90
                        scale >>= exp;
91
#endif
92
93
                    /* Scale from left to right channel,
94
                       do not touch left channel */
95
120k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
96
105k
                    {
97
105k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
98
105k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
99
34.7k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
100
105k
                    }
101
15.3k
                }
102
112k
            }
103
104k
            group++;
104
104k
        }
105
91.3k
    }
106
46.4k
}