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/*
** 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"
/*
* Huffman tables describe structure and symbols of Huffman trees. Huffman tree
* is a kind of binary tree, i. e. each node is either a leaf or has 2 child
* nodes. Items of Huffman table describe non-leaf nodes, that is why those are
* represented by a pair of integers. Depending on a bit value left (0-th) or
* right (1-st) child chosen. If value is non-negative, then it is an index
* of next inner node. Otherwise it encodes a leaf (Huffman symbol). To get the
* symbol value 64 is added to leaf value. Since all integers are int8_t, the
* range of symbol values is -64..63.
*
* Note: table with N entries describes tree with N+1 leaves.
* Note: it is possible to extend range to -64..64, since index 0 is forbidden.
* Note: it is possible to extend the range even further by using deltas instead
* of absolute indices, switching to uint8_t, and employing all the values
* bigger than maximal delta.
*/
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}, {-62, 2}, {-66, 3}, {-60, 4}, {-68, 5},
{-58, 6}, {-70, 7}, {-56, 8}, {-72, 9}, {10, 11},
{-74, -54}, {12, 13}, {-76, -52}, {14, 28}, {15, 21},
{16, 18}, {-50, 17}, {-78, -48}, {19, 20}, {-112, -110},
{-108, -106}, {22, 25}, {23, 24}, {-104, -102}, {-100, -98},
{26, 27}, {-96, -94}, {-92, -90}, {29, 36}, {30, 33},
{31, 32}, {-88, -86}, {-84, -82}, {34, 35}, {-80, -46},
{-44, -42}, {37, 41}, {38, 39}, {-40, -38}, {-36, 40},
{-34, -32}, {42, 45}, {43, 44}, {-30, -28}, {-26, -24},
{46, 47}, {-22, -20}, {-18, -16}
};
static const int8_t f_huffman_env_bal_1_5dB[48][2] = {
{-64, 1}, {-66, 2}, {-62, 3}, {-68, 4}, {-60, 5},
{-58, 6}, {-70, 7}, {-72, 8}, {-56, 9}, {10, 11},
{-74, -54}, {-76, 12}, {-52, 13}, {14, 17}, {-78, 15},
{-50, 16}, {-48, -82}, {18, 32}, {19, 25}, {20, 22},
{-80, 21}, {-112, -110}, {23, 24}, {-108, -106}, {-104, -102},
{26, 29}, {27, 28}, {-100, -98}, {-96, -94}, {30, 31},
{-92, -90}, {-88, -86}, {33, 40}, {34, 37}, {35, 36},
{-84, -46}, {-44, -42}, {38, 39}, {-40, -38}, {-36, -34},
{41, 44}, {42, 43}, {-32, -30}, {-28, -26}, {45, 46},
{-24, -22}, {-20, 47}, {-18, -16}
};
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}, {-62, 2}, {-66, 3}, {-68, 4}, {-60, 5}, {-58, 6},
{-70, 7}, {-72, 8}, {-56, 9}, {10, 16}, {11, 13}, {-74, 12},
{-88, -86}, {14, 15}, {-84, -82}, {-80, -78}, {17, 20}, {18, 19},
{-76, -54}, {-52, -50}, {21, 22}, {-48, -46}, {-44, 23}, {-42, -40}
};
static const int8_t f_huffman_env_bal_3_0dB[24][2] = {
{-64, 1}, {-66, 2}, {-62, 3}, {-68, 4}, {-60, 5}, {-58, 6},
{-70, 7}, {-72, 8}, {-56, 9}, {10, 13}, {-74, 11}, {-54, 12},
{-52, -88}, {14, 17}, {15, 16}, {-86, -84}, {-82, -80}, {18, 21},
{19, 20}, {-78, -76}, {-50, -48}, {22, 23}, {-46, -44}, {-42, -40}
};
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}, {-66, 2}, {-62, 3}, {4, 9}, {-68, 5}, {-60, 6},
{7, 8}, {-88, -86}, {-84, -82}, {10, 17}, {11, 14}, {12, 13},
{-80, -78}, {-76, -74}, {15, 16}, {-72, -70}, {-58, -56}, {18, 21},
{19, 20}, {-54, -52}, {-50, -48}, {22, 23}, {-46, -44}, {-42, -40}
};
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));
}
} else {
for (band = 0; band < sbr->n[sbr->f[ch][env]]; band++)
{
sbr->E[ch][band][env] = (sbr_huff_dec(ld, t_huff));
}
}
}
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));
}
} else {
for (band = 0; band < sbr->N_Q; band++)
{
sbr->Q[ch][band][noise] = (sbr_huff_dec(ld, t_huff));
}
}
}
extract_noise_floor_data(sbr, ch);
}
#endif
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