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