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/*
declares various tables to make things faster
Copyright (C) 1999 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#ifndef __DECODERTABLES_H
#define __DECODERTABLES_H
#include "videoDecoder.h"
#include "proto.h"
/* Code for unbound values in decoding tables */
#define MPGDECODE_ERROR (-1)
#define MACRO_BLOCK_STUFFING 34
#define MACRO_BLOCK_ESCAPE 35
/* Structure for an entry in the decoding table of
* macroblock_address_increment */
typedef struct {
int value; /* value for macroblock_address_increment */
int num_bits; /* length of the Huffman code */
} mb_addr_inc_entry;
/* Structure for an entry in the decoding table of macroblock_type */
typedef struct {
unsigned int mb_quant; /* macroblock_quant */
unsigned int mb_motion_forward; /* macroblock_motion_forward */
unsigned int mb_motion_backward; /* macroblock_motion_backward */
unsigned int mb_pattern; /* macroblock_pattern */
unsigned int mb_intra; /* macroblock_intra */
unsigned int num_bits; /* length of the Huffman code */
} mb_type_entry;
/* Structures for an entry in the decoding table of coded_block_pattern */
typedef struct {
unsigned int cbp; /* coded_block_pattern */
int num_bits; /* length of the Huffman code */
} coded_block_pattern_entry;
/* Structure for an entry in the decoding table of motion vectors */
typedef struct {
int code; /* value for motion_horizontal_forward_code,
* motion_vertical_forward_code,
* motion_horizontal_backward_code, or
* motion_vertical_backward_code.
*/
int num_bits; /* length of the Huffman code */
} motion_vectors_entry;
/* Structure for an entry in the decoding table of dct_dc_size */
typedef struct {
unsigned int value; /* value of dct_dc_size (luminance or chrominance) */
int num_bits; /* length of the Huffman code */
} dct_dc_size_entry;
/* External declaration of dct coeff tables. */
extern unsigned short int dct_coeff_tbl_0[256];
extern unsigned short int dct_coeff_tbl_1[16];
extern unsigned short int dct_coeff_tbl_2[4];
extern unsigned short int dct_coeff_tbl_3[4];
extern unsigned short int dct_coeff_next[256];
extern unsigned short int dct_coeff_first[256];
/* External declaration of dct dc size lumiance table. */
extern dct_dc_size_entry dct_dc_size_luminance[32];
extern dct_dc_size_entry dct_dc_size_luminance1[16];
/* External declaration of dct dc size chrom table. */
extern dct_dc_size_entry dct_dc_size_chrominance[32];
extern dct_dc_size_entry dct_dc_size_chrominance1[32];
/* External declaration of coded block pattern table. */
extern coded_block_pattern_entry coded_block_pattern[512];
/* Decoding table for macroblock_type in predictive-coded pictures */
extern mb_type_entry mb_type_P[64];
/* Decoding table for macroblock_type in bidirectionally-coded pictures */
extern mb_type_entry mb_type_B[64];
/* Decoding table for macroblock_address_increment */
extern mb_addr_inc_entry mb_addr_inc[2048];
/* Decoding table for motion vectors */
extern motion_vectors_entry motion_vectors[2048];
extern void init_tables();
#endif
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