Coverage Report

Created: 2025-08-03 06:05

/proc/self/cwd/libfaad/is.c
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Source
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/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** 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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#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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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)
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76.0k
{
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76.0k
    uint8_t g, sfb, b;
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76.0k
    uint16_t i;
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76.0k
    real_t scale;
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#ifdef FIXED_POINT
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    int32_t exp, frac;
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#endif
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56
76.0k
    uint16_t nshort = frame_len/8;
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76.0k
    uint8_t group = 0;
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235k
    for (g = 0; g < icsr->num_window_groups; g++)
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159k
    {
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        /* Do intensity stereo decoding */
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341k
        for (b = 0; b < icsr->window_group_length[g]; b++)
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181k
        {
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371k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
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189k
            {
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189k
                if (is_intensity(icsr, g, sfb))
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28.9k
                {
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28.9k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
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#ifdef MAIN_DEC
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                    /* For scalefactor bands coded in intensity stereo the
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                       corresponding predictors in the right channel are
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                       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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#ifndef FIXED_POINT
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21.0k
                    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
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7.82k
                    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];
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7.82k
                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
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7.82k
                    if (exp < 0)
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854
                        scale <<= -exp;
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6.97k
                    else
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6.97k
                        scale >>= exp;
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#endif
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                    /* Scale from left to right channel,
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                       do not touch left channel */
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212k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
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183k
                    {
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183k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
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183k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
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68.1k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
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183k
                    }
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28.9k
                }
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189k
            }
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181k
            group++;
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181k
        }
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159k
    }
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76.0k
}
is_decode
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Source
48
30.9k
{
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30.9k
    uint8_t g, sfb, b;
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30.9k
    uint16_t i;
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30.9k
    real_t scale;
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30.9k
#ifdef FIXED_POINT
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30.9k
    int32_t exp, frac;
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30.9k
#endif
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56
30.9k
    uint16_t nshort = frame_len/8;
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30.9k
    uint8_t group = 0;
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97.4k
    for (g = 0; g < icsr->num_window_groups; g++)
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66.5k
    {
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        /* Do intensity stereo decoding */
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144k
        for (b = 0; b < icsr->window_group_length[g]; b++)
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77.5k
        {
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167k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
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89.9k
            {
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89.9k
                if (is_intensity(icsr, g, sfb))
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7.82k
                {
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7.82k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
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#ifdef MAIN_DEC
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                    /* For scalefactor bands coded in intensity stereo the
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                       corresponding predictors in the right channel are
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                       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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#ifndef FIXED_POINT
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                    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
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7.82k
                    scale_factor = min(max(scale_factor, -60), 60);
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7.82k
                    exp = scale_factor >> 2; /* exp is -15..15 */
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7.82k
                    frac = scale_factor & 3;
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7.82k
                    scale = pow05_table[frac];
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7.82k
                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
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7.82k
                    if (exp < 0)
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854
                        scale <<= -exp;
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6.97k
                    else
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6.97k
                        scale >>= exp;
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7.82k
#endif
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                    /* Scale from left to right channel,
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                       do not touch left channel */
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63.8k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
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56.0k
                    {
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56.0k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
98
56.0k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
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35.2k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
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56.0k
                    }
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7.82k
                }
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89.9k
            }
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77.5k
            group++;
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77.5k
        }
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66.5k
    }
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30.9k
}
is_decode
Line
Count
Source
48
45.1k
{
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45.1k
    uint8_t g, sfb, b;
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45.1k
    uint16_t i;
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45.1k
    real_t scale;
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#ifdef FIXED_POINT
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    int32_t exp, frac;
54
#endif
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56
45.1k
    uint16_t nshort = frame_len/8;
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45.1k
    uint8_t group = 0;
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59
138k
    for (g = 0; g < icsr->num_window_groups; g++)
60
92.9k
    {
61
        /* Do intensity stereo decoding */
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196k
        for (b = 0; b < icsr->window_group_length[g]; b++)
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104k
        {
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203k
            for (sfb = 0; sfb < icsr->max_sfb; sfb++)
65
99.7k
            {
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99.7k
                if (is_intensity(icsr, g, sfb))
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21.0k
                {
68
21.0k
                    int16_t scale_factor = icsr->scale_factors[g][sfb];
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21.0k
#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
                     */
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21.0k
                    ics->pred.prediction_used[sfb] = 0;
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21.0k
                    icsr->pred.prediction_used[sfb] = 0;
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21.0k
#endif
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78
21.0k
#ifndef FIXED_POINT
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21.0k
                    scale_factor = min(max(scale_factor, -120), 120);
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21.0k
                    scale = (real_t)pow(0.5, (0.25*scale_factor));
81
#else
82
                    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];
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                    exp += COEF_BITS - REAL_BITS; /* exp is -1..29 */
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                    if (exp < 0)
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                        scale <<= -exp;
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                    else
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                        scale >>= exp;
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#endif
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93
                    /* Scale from left to right channel,
94
                       do not touch left channel */
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148k
                    for (i = icsr->swb_offset[sfb]; i < min(icsr->swb_offset[sfb+1], ics->swb_offset_max); i++)
96
127k
                    {
97
127k
                        r_spec[(group*nshort)+i] = MUL_R(l_spec[(group*nshort)+i], scale);
98
127k
                        if (is_intensity(icsr, g, sfb) != invert_intensity(ics, g, sfb))
99
32.8k
                            r_spec[(group*nshort)+i] = -r_spec[(group*nshort)+i];
100
127k
                    }
101
21.0k
                }
102
99.7k
            }
103
104k
            group++;
104
104k
        }
105
92.9k
    }
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45.1k
}