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sbr_huff.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: sbr_huff.c,v 1.21 2007/11/01 12:33:35 menno Exp $
**/

#include "common.h"
#include "structs.h"

#ifdef SBR_DEC

#include "sbr_syntax.h"
#include "bits.h"
#include "sbr_huff.h"
#include "sbr_e_nf.h"


typedef const int8_t (*sbr_huff_tab)[2];

static const int8_t t_huffman_env_1_5dB[120][2] = {
    {   1,   2 },    { -64, -65 },    {   3,   4 },    { -63, -66 },
    {   5,   6 },    { -62, -67 },    {   7,   8 },    { -61, -68 },
    {   9,  10 },    { -60, -69 },    {  11,  12 },    { -59, -70 },
    {  13,  14 },    { -58, -71 },    {  15,  16 },    { -57, -72 },
    {  17,  18 },    { -73, -56 },    {  19,  21 },    { -74,  20 },
    { -55, -75 },    {  22,  26 },    {  23,  24 },    { -54, -76 },
    { -77,  25 },    { -53, -78 },    {  27,  34 },    {  28,  29 },
    { -52, -79 },    {  30,  31 },    { -80, -51 },    {  32,  33 },
    { -83, -82 },    { -81, -50 },    {  35,  57 },    {  36,  40 },
    {  37,  38 },    { -88, -84 },    { -48,  39 },    { -90, -85 },
    {  41,  46 },    {  42,  43 },    { -49, -87 },    {  44,  45 },
    { -89, -86 },    {-124,-123 },    {  47,  50 },    {  48,  49 },
    {-122,-121 },    {-120,-119 },    {  51,  54 },    {  52,  53 },
    {-118,-117 },    {-116,-115 },    {  55,  56 },    {-114,-113 },
    {-112,-111 },    {  58,  89 },    {  59,  74 },    {  60,  67 },
    {  61,  64 },    {  62,  63 },    {-110,-109 },    {-108,-107 },
    {  65,  66 },    {-106,-105 },    {-104,-103 },    {  68,  71 },
    {  69,  70 },    {-102,-101 },    {-100, -99 },    {  72,  73 },
    { -98, -97 },    { -96, -95 },    {  75,  82 },    {  76,  79 },
    {  77,  78 },    { -94, -93 },    { -92, -91 },    {  80,  81 },
    { -47, -46 },    { -45, -44 },    {  83,  86 },    {  84,  85 },
    { -43, -42 },    { -41, -40 },    {  87,  88 },    { -39, -38 },
    { -37, -36 },    {  90, 105 },    {  91,  98 },    {  92,  95 },
    {  93,  94 },    { -35, -34 },    { -33, -32 },    {  96,  97 },
    { -31, -30 },    { -29, -28 },    {  99, 102 },    { 100, 101 },
    { -27, -26 },    { -25, -24 },    { 103, 104 },    { -23, -22 },
    { -21, -20 },    { 106, 113 },    { 107, 110 },    { 108, 109 },
    { -19, -18 },    { -17, -16 },    { 111, 112 },    { -15, -14 },
    { -13, -12 },    { 114, 117 },    { 115, 116 },    { -11, -10 },
    {  -9,  -8 },    { 118, 119 },    {  -7,  -6 },    {  -5,  -4 }
};

static const int8_t f_huffman_env_1_5dB[120][2] = {
    {   1,   2 },    { -64, -65 },    {   3,   4 },    { -63, -66 },
    {   5,   6 },    { -67, -62 },    {   7,   8 },    { -68, -61 },
    {   9,  10 },    { -69, -60 },    {  11,  13 },    { -70,  12 },
    { -59, -71 },    {  14,  16 },    { -58,  15 },    { -72, -57 },
    {  17,  19 },    { -73,  18 },    { -56, -74 },    {  20,  23 },
    {  21,  22 },    { -55, -75 },    { -54, -53 },    {  24,  27 },
    {  25,  26 },    { -76, -52 },    { -77, -51 },    {  28,  31 },
    {  29,  30 },    { -50, -78 },    { -79, -49 },    {  32,  36 },
    {  33,  34 },    { -48, -47 },    { -80,  35 },    { -81, -82 },
    {  37,  47 },    {  38,  41 },    {  39,  40 },    { -83, -46 },
    { -45, -84 },    {  42,  44 },    { -85,  43 },    { -44, -43 },
    {  45,  46 },    { -88, -87 },    { -86, -90 },    {  48,  66 },
    {  49,  56 },    {  50,  53 },    {  51,  52 },    { -92, -42 },
    { -41, -39 },    {  54,  55 },    {-105, -89 },    { -38, -37 },
    {  57,  60 },    {  58,  59 },    { -94, -91 },    { -40, -36 },
    {  61,  63 },    { -20,  62 },    {-115,-110 },    {  64,  65 },
    {-108,-107 },    {-101, -97 },    {  67,  89 },    {  68,  75 },
    {  69,  72 },    {  70,  71 },    { -95, -93 },    { -34, -27 },
    {  73,  74 },    { -22, -17 },    { -16,-124 },    {  76,  82 },
    {  77,  79 },    {-123,  78 },    {-122,-121 },    {  80,  81 },
    {-120,-119 },    {-118,-117 },    {  83,  86 },    {  84,  85 },
    {-116,-114 },    {-113,-112 },    {  87,  88 },    {-111,-109 },
    {-106,-104 },    {  90, 105 },    {  91,  98 },    {  92,  95 },
    {  93,  94 },    {-103,-102 },    {-100, -99 },    {  96,  97 },
    { -98, -96 },    { -35, -33 },    {  99, 102 },    { 100, 101 },
    { -32, -31 },    { -30, -29 },    { 103, 104 },    { -28, -26 },
    { -25, -24 },    { 106, 113 },    { 107, 110 },    { 108, 109 },
    { -23, -21 },    { -19, -18 },    { 111, 112 },    { -15, -14 },
    { -13, -12 },    { 114, 117 },    { 115, 116 },    { -11, -10 },
    {  -9,  -8 },    { 118, 119 },    {  -7,  -6 },    {  -5,  -4 }
};

static const int8_t t_huffman_env_bal_1_5dB[48][2] = {
    { -64,   1 },    { -63,   2 },    { -65,   3 },    { -62,   4 },
    { -66,   5 },    { -61,   6 },    { -67,   7 },    { -60,   8 },
    { -68,   9 },    {  10,  11 },    { -69, -59 },    {  12,  13 },
    { -70, -58 },    {  14,  28 },    {  15,  21 },    {  16,  18 },
    { -57,  17 },    { -71, -56 },    {  19,  20 },    { -88, -87 },
    { -86, -85 },    {  22,  25 },    {  23,  24 },    { -84, -83 },
    { -82, -81 },    {  26,  27 },    { -80, -79 },    { -78, -77 },
    {  29,  36 },    {  30,  33 },    {  31,  32 },    { -76, -75 },
    { -74, -73 },    {  34,  35 },    { -72, -55 },    { -54, -53 },
    {  37,  41 },    {  38,  39 },    { -52, -51 },    { -50,  40 },
    { -49, -48 },    {  42,  45 },    {  43,  44 },    { -47, -46 },
    { -45, -44 },    {  46,  47 },    { -43, -42 },    { -41, -40 }
};

static const int8_t f_huffman_env_bal_1_5dB[48][2] = {
    { -64,   1 },    { -65,   2 },    { -63,   3 },    { -66,   4 },
    { -62,   5 },    { -61,   6 },    { -67,   7 },    { -68,   8 },
    { -60,   9 },    {  10,  11 },    { -69, -59 },    { -70,  12 },
    { -58,  13 },    {  14,  17 },    { -71,  15 },    { -57,  16 },
    { -56, -73 },    {  18,  32 },    {  19,  25 },    {  20,  22 },
    { -72,  21 },    { -88, -87 },    {  23,  24 },    { -86, -85 },
    { -84, -83 },    {  26,  29 },    {  27,  28 },    { -82, -81 },
    { -80, -79 },    {  30,  31 },    { -78, -77 },    { -76, -75 },
    {  33,  40 },    {  34,  37 },    {  35,  36 },    { -74, -55 },
    { -54, -53 },    {  38,  39 },    { -52, -51 },    { -50, -49 },
    {  41,  44 },    {  42,  43 },    { -48, -47 },    { -46, -45 },
    {  45,  46 },    { -44, -43 },    { -42,  47 },    { -41, -40 }
};

static const int8_t t_huffman_env_3_0dB[62][2] = {
    { -64,   1 },    { -65,   2 },    { -63,   3 },    { -66,   4 },
    { -62,   5 },    { -67,   6 },    { -61,   7 },    { -68,   8 },
    { -60,   9 },    {  10,  11 },    { -69, -59 },    {  12,  14 },
    { -70,  13 },    { -71, -58 },    {  15,  18 },    {  16,  17 },
    { -72, -57 },    { -73, -74 },    {  19,  22 },    { -56,  20 },
    { -55,  21 },    { -54, -77 },    {  23,  31 },    {  24,  25 },
    { -75, -76 },    {  26,  27 },    { -78, -53 },    {  28,  29 },
    { -52, -95 },    { -94,  30 },    { -93, -92 },    {  32,  47 },
    {  33,  40 },    {  34,  37 },    {  35,  36 },    { -91, -90 },
    { -89, -88 },    {  38,  39 },    { -87, -86 },    { -85, -84 },
    {  41,  44 },    {  42,  43 },    { -83, -82 },    { -81, -80 },
    {  45,  46 },    { -79, -51 },    { -50, -49 },    {  48,  55 },
    {  49,  52 },    {  50,  51 },    { -48, -47 },    { -46, -45 },
    {  53,  54 },    { -44, -43 },    { -42, -41 },    {  56,  59 },
    {  57,  58 },    { -40, -39 },    { -38, -37 },    {  60,  61 },
    { -36, -35 },    { -34, -33 }
};

static const int8_t f_huffman_env_3_0dB[62][2] = {
    { -64,   1 },    { -65,   2 },    { -63,   3 },    { -66,   4 },
    { -62,   5 },    { -67,   6 },    {   7,   8 },    { -61, -68 },
    {   9,  10 },    { -60, -69 },    {  11,  12 },    { -59, -70 },
    {  13,  14 },    { -58, -71 },    {  15,  16 },    { -57, -72 },
    {  17,  19 },    { -56,  18 },    { -55, -73 },    {  20,  24 },
    {  21,  22 },    { -74, -54 },    { -53,  23 },    { -75, -76 },
    {  25,  30 },    {  26,  27 },    { -52, -51 },    {  28,  29 },
    { -77, -79 },    { -50, -49 },    {  31,  39 },    {  32,  35 },
    {  33,  34 },    { -78, -46 },    { -82, -88 },    {  36,  37 },
    { -83, -48 },    { -47,  38 },    { -86, -85 },    {  40,  47 },
    {  41,  44 },    {  42,  43 },    { -80, -44 },    { -43, -42 },
    {  45,  46 },    { -39, -87 },    { -84, -40 },    {  48,  55 },
    {  49,  52 },    {  50,  51 },    { -95, -94 },    { -93, -92 },
    {  53,  54 },    { -91, -90 },    { -89, -81 },    {  56,  59 },
    {  57,  58 },    { -45, -41 },    { -38, -37 },    {  60,  61 },
    { -36, -35 },    { -34, -33 }
};

static const int8_t t_huffman_env_bal_3_0dB[24][2] = {
    { -64,   1 },    { -63,   2 },    { -65,   3 },    { -66,   4 },
    { -62,   5 },    { -61,   6 },    { -67,   7 },    { -68,   8 },
    { -60,   9 },    {  10,  16 },    {  11,  13 },    { -69,  12 },
    { -76, -75 },    {  14,  15 },    { -74, -73 },    { -72, -71 },
    {  17,  20 },    {  18,  19 },    { -70, -59 },    { -58, -57 },
    {  21,  22 },    { -56, -55 },    { -54,  23 },    { -53, -52 }
};

static const int8_t f_huffman_env_bal_3_0dB[24][2] = {
    { -64,   1 },    { -65,   2 },    { -63,   3 },    { -66,   4 },
    { -62,   5 },    { -61,   6 },    { -67,   7 },    { -68,   8 },
    { -60,   9 },    {  10,  13 },    { -69,  11 },    { -59,  12 },
    { -58, -76 },    {  14,  17 },    {  15,  16 },    { -75, -74 },
    { -73, -72 },    {  18,  21 },    {  19,  20 },    { -71, -70 },
    { -57, -56 },    {  22,  23 },    { -55, -54 },    { -53, -52 }
};

static const int8_t t_huffman_noise_3_0dB[62][2] = {
    { -64,   1 },    { -63,   2 },    { -65,   3 },    { -66,   4 },
    { -62,   5 },    { -67,   6 },    {   7,   8 },    { -61, -68 },
    {   9,  30 },    {  10,  15 },    { -60,  11 },    { -69,  12 },
    {  13,  14 },    { -59, -53 },    { -95, -94 },    {  16,  23 },
    {  17,  20 },    {  18,  19 },    { -93, -92 },    { -91, -90 },
    {  21,  22 },    { -89, -88 },    { -87, -86 },    {  24,  27 },
    {  25,  26 },    { -85, -84 },    { -83, -82 },    {  28,  29 },
    { -81, -80 },    { -79, -78 },    {  31,  46 },    {  32,  39 },
    {  33,  36 },    {  34,  35 },    { -77, -76 },    { -75, -74 },
    {  37,  38 },    { -73, -72 },    { -71, -70 },    {  40,  43 },
    {  41,  42 },    { -58, -57 },    { -56, -55 },    {  44,  45 },
    { -54, -52 },    { -51, -50 },    {  47,  54 },    {  48,  51 },
    {  49,  50 },    { -49, -48 },    { -47, -46 },    {  52,  53 },
    { -45, -44 },    { -43, -42 },    {  55,  58 },    {  56,  57 },
    { -41, -40 },    { -39, -38 },    {  59,  60 },    { -37, -36 },
    { -35,  61 },    { -34, -33 }
};

static const int8_t t_huffman_noise_bal_3_0dB[24][2] = {
    { -64,   1 },    { -65,   2 },    { -63,   3 },    {   4,   9 },
    { -66,   5 },    { -62,   6 },    {   7,   8 },    { -76, -75 },
    { -74, -73 },    {  10,  17 },    {  11,  14 },    {  12,  13 },
    { -72, -71 },    { -70, -69 },    {  15,  16 },    { -68, -67 },
    { -61, -60 },    {  18,  21 },    {  19,  20 },    { -59, -58 },
    { -57, -56 },    {  22,  23 },    { -55, -54 },    { -53, -52 }
};


static INLINE int16_t sbr_huff_dec(bitfile *ld, sbr_huff_tab t_huff)
{
    uint8_t bit;
    int16_t index = 0;

    while (index >= 0)
    {
        bit = (uint8_t)faad_get1bit(ld);
        index = t_huff[index][bit];
    }

    return index + 64;
}

/* table 10 */
void sbr_envelope(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
    uint8_t env, band;
    int8_t delta = 0;
    sbr_huff_tab t_huff, f_huff;

    if ((sbr->L_E[ch] == 1) && (sbr->bs_frame_class[ch] == FIXFIX))
        sbr->amp_res[ch] = 0;
    else
        sbr->amp_res[ch] = sbr->bs_amp_res;

    if ((sbr->bs_coupling) && (ch == 1))
    {
        delta = 1;
        if (sbr->amp_res[ch])
        {
            t_huff = t_huffman_env_bal_3_0dB;
            f_huff = f_huffman_env_bal_3_0dB;
        } else {
            t_huff = t_huffman_env_bal_1_5dB;
            f_huff = f_huffman_env_bal_1_5dB;
        }
    } else {
        delta = 0;
        if (sbr->amp_res[ch])
        {
            t_huff = t_huffman_env_3_0dB;
            f_huff = f_huffman_env_3_0dB;
        } else {
            t_huff = t_huffman_env_1_5dB;
            f_huff = f_huffman_env_1_5dB;
        }
    }

    for (env = 0; env < sbr->L_E[ch]; env++)
    {
        if (sbr->bs_df_env[ch][env] == 0)
        {
            if ((sbr->bs_coupling == 1) && (ch == 1))
            {
                if (sbr->amp_res[ch])
                {
                    sbr->E[ch][0][env] = (uint16_t)(faad_getbits(ld, 5
                        DEBUGVAR(1,272,"sbr_envelope(): bs_data_env")) << delta);
                } else {
                    sbr->E[ch][0][env] = (uint16_t)(faad_getbits(ld, 6
                        DEBUGVAR(1,273,"sbr_envelope(): bs_data_env")) << delta);
                }
            } else {
                if (sbr->amp_res[ch])
                {
                    sbr->E[ch][0][env] = (uint16_t)(faad_getbits(ld, 6
                        DEBUGVAR(1,274,"sbr_envelope(): bs_data_env")) << delta);
                } else {
                    sbr->E[ch][0][env] = (uint16_t)(faad_getbits(ld, 7
                        DEBUGVAR(1,275,"sbr_envelope(): bs_data_env")) << delta);
                }
            }

            for (band = 1; band < sbr->n[sbr->f[ch][env]]; band++)
            {
                sbr->E[ch][band][env] = (sbr_huff_dec(ld, f_huff) << delta);
            }

        } else {
            for (band = 0; band < sbr->n[sbr->f[ch][env]]; band++)
            {
                sbr->E[ch][band][env] = (sbr_huff_dec(ld, t_huff) << delta);
            }
        }
    }

    extract_envelope_data(sbr, ch);
}

/* table 11 */
void sbr_noise(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
    uint8_t noise, band;
    int8_t delta = 0;
    sbr_huff_tab t_huff, f_huff;

    if ((sbr->bs_coupling == 1) && (ch == 1))
    {
        delta = 1;
        t_huff = t_huffman_noise_bal_3_0dB;
        f_huff = f_huffman_env_bal_3_0dB;
    } else {
        delta = 0;
        t_huff = t_huffman_noise_3_0dB;
        f_huff = f_huffman_env_3_0dB;
    }

    for (noise = 0; noise < sbr->L_Q[ch]; noise++)
    {
        if(sbr->bs_df_noise[ch][noise] == 0)
        {
            if ((sbr->bs_coupling == 1) && (ch == 1))
            {
                sbr->Q[ch][0][noise] = (faad_getbits(ld, 5
                    DEBUGVAR(1,276,"sbr_noise(): bs_data_noise")) << delta);
            } else {
                sbr->Q[ch][0][noise] = (faad_getbits(ld, 5
                    DEBUGVAR(1,277,"sbr_noise(): bs_data_noise")) << delta);
            }
            for (band = 1; band < sbr->N_Q; band++)
            {
                sbr->Q[ch][band][noise] = (sbr_huff_dec(ld, f_huff) << delta);
            }
        } else {
            for (band = 0; band < sbr->N_Q; band++)
            {
                sbr->Q[ch][band][noise] = (sbr_huff_dec(ld, t_huff) << delta);
            }
        }
    }

    extract_noise_floor_data(sbr, ch);
}

#endif

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