hcb.h
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- /*
- ** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
- ** Copyright (C) 2003 M. Bakker, Ahead Software 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.
- **
- ** Commercial non-GPL licensing of this software is possible.
- ** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
- **
- ** $Id: hcb.h,v 1.2 2005/11/01 21:41:43 gabest Exp $
- **/
- #ifndef __HCB_H__
- #define __HCB_H__
- #ifdef __cplusplus
- extern "C" {
- #endif
- /*
- * Optimal huffman decoding for AAC taken from:
- * "SELECTING AN OPTIMAL HUFFMAN DECODER FOR AAC" by
- * VLADIMIR Z. MESAROVIC , RAGHUNATH RAO, MIROSLAV V. DOKIC, and SACHIN DEO
- * AES paper 5436
- *
- * 2 methods are used for huffman decoding:
- * - binary search
- * - 2-step table lookup
- *
- * The choice of the "optimal" method is based on the fact that if the
- * memory size for the Two-step is exorbitantly high then the decision
- * is Binary search for that codebook. However, for marginally more memory
- * size, if Twostep outperforms even the best case of Binary then the
- * decision is Two-step for that codebook.
- *
- * The following methods are used for the different tables.
- * codebook "optimal" method
- * HCB_1 2-Step
- * HCB_2 2-Step
- * HCB_3 Binary
- * HCB_4 2-Step
- * HCB_5 Binary
- * HCB_6 2-Step
- * HCB_7 Binary
- * HCB_8 2-Step
- * HCB_9 Binary
- * HCB_10 2-Step
- * HCB_11 2-Step
- * HCB_SF Binary
- *
- */
- #define ZERO_HCB 0
- #define FIRST_PAIR_HCB 5
- #define ESC_HCB 11
- #define QUAD_LEN 4
- #define PAIR_LEN 2
- #define NOISE_HCB 13
- #define INTENSITY_HCB2 14
- #define INTENSITY_HCB 15
- /* 1st step table */
- typedef struct
- {
- uint8_t offset;
- uint8_t extra_bits;
- } hcb;
- /* 2nd step table with quadruple data */
- typedef struct
- {
- uint8_t bits;
- int8_t x;
- int8_t y;
- } hcb_2_pair;
- typedef struct
- {
- uint8_t bits;
- int8_t x;
- int8_t y;
- int8_t v;
- int8_t w;
- } hcb_2_quad;
- /* binary search table */
- typedef struct
- {
- uint8_t is_leaf;
- int8_t data[4];
- } hcb_bin_quad;
- typedef struct
- {
- uint8_t is_leaf;
- int8_t data[2];
- } hcb_bin_pair;
- hcb *hcb_table[];
- hcb_2_quad *hcb_2_quad_table[];
- hcb_2_pair *hcb_2_pair_table[];
- hcb_bin_pair *hcb_bin_table[];
- uint8_t hcbN[];
- uint8_t unsigned_cb[];
- int hcb_2_quad_table_size[];
- int hcb_2_pair_table_size[];
- int hcb_bin_table_size[];
- #include "codebook/hcb_1.h"
- #include "codebook/hcb_2.h"
- #include "codebook/hcb_3.h"
- #include "codebook/hcb_4.h"
- #include "codebook/hcb_5.h"
- #include "codebook/hcb_6.h"
- #include "codebook/hcb_7.h"
- #include "codebook/hcb_8.h"
- #include "codebook/hcb_9.h"
- #include "codebook/hcb_10.h"
- #include "codebook/hcb_11.h"
- #include "codebook/hcb_sf.h"
- #ifdef __cplusplus
- }
- #endif
- #endif