143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
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/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003 M. Bakker, Ahead Software 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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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
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**
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** $Id$
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**/
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#ifndef __HCB_H__
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#define __HCB_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Optimal huffman decoding for AAC taken from:
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* "SELECTING AN OPTIMAL HUFFMAN DECODER FOR AAC" by
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* VLADIMIR Z. MESAROVIC , RAGHUNATH RAO, MIROSLAV V. DOKIC, and SACHIN DEO
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* AES paper 5436
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*
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* 2 methods are used for huffman decoding:
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* - binary search
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* - 2-step table lookup
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*
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* The choice of the "optimal" method is based on the fact that if the
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* memory size for the Two-step is exorbitantly high then the decision
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* is Binary search for that codebook. However, for marginally more memory
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* size, if Twostep outperforms even the best case of Binary then the
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* decision is Two-step for that codebook.
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*
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* The following methods are used for the different tables.
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* codebook "optimal" method
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* HCB_1 2-Step
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* HCB_2 2-Step
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* HCB_3 Binary
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* HCB_4 2-Step
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* HCB_5 Binary
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* HCB_6 2-Step
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* HCB_7 Binary
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* HCB_8 2-Step
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* HCB_9 Binary
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* HCB_10 2-Step
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* HCB_11 2-Step
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* HCB_SF Binary
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*
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*/
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#define ZERO_HCB 0
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#define FIRST_PAIR_HCB 5
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#define ESC_HCB 11
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#define QUAD_LEN 4
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#define PAIR_LEN 2
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#define NOISE_HCB 13
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#define INTENSITY_HCB2 14
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#define INTENSITY_HCB 15
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/* 1st step table */
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typedef struct
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{
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uint8_t offset;
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uint8_t extra_bits;
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} hcb;
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/* 2nd step table with quadruple data */
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typedef struct
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{
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uint8_t bits;
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int8_t x;
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int8_t y;
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} hcb_2_pair;
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typedef struct
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{
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uint8_t bits;
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int8_t x;
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int8_t y;
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int8_t v;
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int8_t w;
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} hcb_2_quad;
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/* binary search table */
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typedef struct
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{
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uint8_t is_leaf;
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int8_t data[4];
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} hcb_bin_quad;
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typedef struct
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{
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uint8_t is_leaf;
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int8_t data[2];
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} hcb_bin_pair;
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hcb *hcb_table[];
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hcb_2_quad *hcb_2_quad_table[];
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hcb_2_pair *hcb_2_pair_table[];
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hcb_bin_pair *hcb_bin_table[];
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uint8_t hcbN[];
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uint8_t unsigned_cb[];
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int hcb_2_quad_table_size[];
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int hcb_2_pair_table_size[];
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int hcb_bin_table_size[];
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#include "codebook/hcb_1.h"
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#include "codebook/hcb_2.h"
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#include "codebook/hcb_3.h"
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#include "codebook/hcb_4.h"
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#include "codebook/hcb_5.h"
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#include "codebook/hcb_6.h"
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#include "codebook/hcb_7.h"
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#include "codebook/hcb_8.h"
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#include "codebook/hcb_9.h"
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#include "codebook/hcb_10.h"
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#include "codebook/hcb_11.h"
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#include "codebook/hcb_sf.h"
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#ifdef __cplusplus
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}
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#endif
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#endif
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