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|
/*
* decoders.c
*
* This file contains all the routines for Huffman decoding required in
* MPEG
*
*/
#include "decoderTables.h"
using namespace std;
/* Decoding table for macroblock_address_increment */
mb_addr_inc_entry mb_addr_inc[2048];
/* Decoding table for macroblock_type in predictive-coded pictures */
mb_type_entry mb_type_P[64];
/* Decoding table for macroblock_type in bidirectionally-coded pictures */
mb_type_entry mb_type_B[64];
/* Decoding table for motion vectors */
motion_vectors_entry motion_vectors[2048];
/* Decoding table for coded_block_pattern */
coded_block_pattern_entry coded_block_pattern[512] =
{ {(unsigned int)MPGDECODE_ERROR, 0}, {(unsigned int)MPGDECODE_ERROR, 0}, {39, 9}, {27, 9}, {59, 9}, {55, 9}, {47, 9}, {31, 9},
{58, 8}, {58, 8}, {54, 8}, {54, 8}, {46, 8}, {46, 8}, {30, 8}, {30, 8},
{57, 8}, {57, 8}, {53, 8}, {53, 8}, {45, 8}, {45, 8}, {29, 8}, {29, 8},
{38, 8}, {38, 8}, {26, 8}, {26, 8}, {37, 8}, {37, 8}, {25, 8}, {25, 8},
{43, 8}, {43, 8}, {23, 8}, {23, 8}, {51, 8}, {51, 8}, {15, 8}, {15, 8},
{42, 8}, {42, 8}, {22, 8}, {22, 8}, {50, 8}, {50, 8}, {14, 8}, {14, 8},
{41, 8}, {41, 8}, {21, 8}, {21, 8}, {49, 8}, {49, 8}, {13, 8}, {13, 8},
{35, 8}, {35, 8}, {19, 8}, {19, 8}, {11, 8}, {11, 8}, {7, 8}, {7, 8},
{34, 7}, {34, 7}, {34, 7}, {34, 7}, {18, 7}, {18, 7}, {18, 7}, {18, 7},
{10, 7}, {10, 7}, {10, 7}, {10, 7}, {6, 7}, {6, 7}, {6, 7}, {6, 7},
{33, 7}, {33, 7}, {33, 7}, {33, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},
{9, 7}, {9, 7}, {9, 7}, {9, 7}, {5, 7}, {5, 7}, {5, 7}, {5, 7},
{63, 6}, {63, 6}, {63, 6}, {63, 6}, {63, 6}, {63, 6}, {63, 6}, {63, 6},
{3, 6}, {3, 6}, {3, 6}, {3, 6}, {3, 6}, {3, 6}, {3, 6}, {3, 6},
{36, 6}, {36, 6}, {36, 6}, {36, 6}, {36, 6}, {36, 6}, {36, 6}, {36, 6},
{24, 6}, {24, 6}, {24, 6}, {24, 6}, {24, 6}, {24, 6}, {24, 6}, {24, 6},
{62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5},
{62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5}, {62, 5},
{2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5},
{2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5}, {2, 5},
{61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5},
{61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5}, {61, 5},
{1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5},
{1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5}, {1, 5},
{56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5},
{56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5}, {56, 5},
{52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5},
{52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5}, {52, 5},
{44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5},
{44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5}, {44, 5},
{28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5},
{28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5}, {28, 5},
{40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5},
{40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5}, {40, 5},
{20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5},
{20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5}, {20, 5},
{48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5},
{48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5}, {48, 5},
{12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},
{12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},
{32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4},
{32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4},
{32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4},
{32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4}, {32, 4},
{16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4},
{16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4},
{16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4},
{16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4}, {16, 4},
{8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4},
{8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4},
{8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4},
{8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4}, {8, 4},
{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
{4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4}, {4, 4},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3},
{60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}, {60, 3}
};
/* Decoding tables for dct_dc_size_luminance */
dct_dc_size_entry dct_dc_size_luminance[32] =
{ {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2},
{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
{0, 3}, {0, 3}, {0, 3}, {0, 3}, {3, 3}, {3, 3}, {3, 3}, {3, 3},
{4, 3}, {4, 3}, {4, 3}, {4, 3}, {5, 4}, {5, 4}, {6, 5}, {(unsigned int)MPGDECODE_ERROR, 0}
};
dct_dc_size_entry dct_dc_size_luminance1[16] =
{ {7, 6}, {7, 6}, {7, 6}, {7, 6}, {7, 6}, {7, 6}, {7, 6}, {7, 6},
{8, 7}, {8, 7}, {8, 7}, {8, 7}, {9, 8}, {9, 8}, {10, 9}, {11, 9}
};
/* Decoding table for dct_dc_size_chrominance */
dct_dc_size_entry dct_dc_size_chrominance[32] =
{ {0, 2}, {0, 2}, {0, 2}, {0, 2}, {0, 2}, {0, 2}, {0, 2}, {0, 2},
{1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2}, {1, 2},
{2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2}, {2, 2},
{3, 3}, {3, 3}, {3, 3}, {3, 3}, {4, 4}, {4, 4}, {5, 5}, {(unsigned int)MPGDECODE_ERROR, 0}
};
dct_dc_size_entry dct_dc_size_chrominance1[32] =
{ {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6},
{6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6}, {6, 6},
{7, 7}, {7, 7}, {7, 7}, {7, 7}, {7, 7}, {7, 7}, {7, 7}, {7, 7},
{8, 8}, {8, 8}, {8, 8}, {8, 8}, {9, 9}, {9, 9}, {10, 10}, {11, 10}
};
/* DCT coeff tables. */
unsigned short int dct_coeff_tbl_0[256] =
{
0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff,
0x052f, 0x051f, 0x050f, 0x04ff,
0x183f, 0x402f, 0x3c2f, 0x382f,
0x342f, 0x302f, 0x2c2f, 0x7c1f,
0x781f, 0x741f, 0x701f, 0x6c1f,
0x028e, 0x028e, 0x027e, 0x027e,
0x026e, 0x026e, 0x025e, 0x025e,
0x024e, 0x024e, 0x023e, 0x023e,
0x022e, 0x022e, 0x021e, 0x021e,
0x020e, 0x020e, 0x04ee, 0x04ee,
0x04de, 0x04de, 0x04ce, 0x04ce,
0x04be, 0x04be, 0x04ae, 0x04ae,
0x049e, 0x049e, 0x048e, 0x048e,
0x01fd, 0x01fd, 0x01fd, 0x01fd,
0x01ed, 0x01ed, 0x01ed, 0x01ed,
0x01dd, 0x01dd, 0x01dd, 0x01dd,
0x01cd, 0x01cd, 0x01cd, 0x01cd,
0x01bd, 0x01bd, 0x01bd, 0x01bd,
0x01ad, 0x01ad, 0x01ad, 0x01ad,
0x019d, 0x019d, 0x019d, 0x019d,
0x018d, 0x018d, 0x018d, 0x018d,
0x017d, 0x017d, 0x017d, 0x017d,
0x016d, 0x016d, 0x016d, 0x016d,
0x015d, 0x015d, 0x015d, 0x015d,
0x014d, 0x014d, 0x014d, 0x014d,
0x013d, 0x013d, 0x013d, 0x013d,
0x012d, 0x012d, 0x012d, 0x012d,
0x011d, 0x011d, 0x011d, 0x011d,
0x010d, 0x010d, 0x010d, 0x010d,
0x282c, 0x282c, 0x282c, 0x282c,
0x282c, 0x282c, 0x282c, 0x282c,
0x242c, 0x242c, 0x242c, 0x242c,
0x242c, 0x242c, 0x242c, 0x242c,
0x143c, 0x143c, 0x143c, 0x143c,
0x143c, 0x143c, 0x143c, 0x143c,
0x0c4c, 0x0c4c, 0x0c4c, 0x0c4c,
0x0c4c, 0x0c4c, 0x0c4c, 0x0c4c,
0x085c, 0x085c, 0x085c, 0x085c,
0x085c, 0x085c, 0x085c, 0x085c,
0x047c, 0x047c, 0x047c, 0x047c,
0x047c, 0x047c, 0x047c, 0x047c,
0x046c, 0x046c, 0x046c, 0x046c,
0x046c, 0x046c, 0x046c, 0x046c,
0x00fc, 0x00fc, 0x00fc, 0x00fc,
0x00fc, 0x00fc, 0x00fc, 0x00fc,
0x00ec, 0x00ec, 0x00ec, 0x00ec,
0x00ec, 0x00ec, 0x00ec, 0x00ec,
0x00dc, 0x00dc, 0x00dc, 0x00dc,
0x00dc, 0x00dc, 0x00dc, 0x00dc,
0x00cc, 0x00cc, 0x00cc, 0x00cc,
0x00cc, 0x00cc, 0x00cc, 0x00cc,
0x681c, 0x681c, 0x681c, 0x681c,
0x681c, 0x681c, 0x681c, 0x681c,
0x641c, 0x641c, 0x641c, 0x641c,
0x641c, 0x641c, 0x641c, 0x641c,
0x601c, 0x601c, 0x601c, 0x601c,
0x601c, 0x601c, 0x601c, 0x601c,
0x5c1c, 0x5c1c, 0x5c1c, 0x5c1c,
0x5c1c, 0x5c1c, 0x5c1c, 0x5c1c,
0x581c, 0x581c, 0x581c, 0x581c,
0x581c, 0x581c, 0x581c, 0x581c,
};
unsigned short int dct_coeff_tbl_1[16] =
{
0x00bb, 0x202b, 0x103b, 0x00ab,
0x084b, 0x1c2b, 0x541b, 0x501b,
0x009b, 0x4c1b, 0x481b, 0x045b,
0x0c3b, 0x008b, 0x182b, 0x441b,
};
unsigned short int dct_coeff_tbl_2[4] =
{
0x4019, 0x1429, 0x0079, 0x0839,
};
unsigned short int dct_coeff_tbl_3[4] =
{
0x0449, 0x3c19, 0x3819, 0x1029,
};
unsigned short int dct_coeff_next[256] =
{
0xffff, 0xffff, 0xffff, 0xffff,
0xf7d5, 0xf7d5, 0xf7d5, 0xf7d5,
0x0826, 0x0826, 0x2416, 0x2416,
0x0046, 0x0046, 0x2016, 0x2016,
0x1c15, 0x1c15, 0x1c15, 0x1c15,
0x1815, 0x1815, 0x1815, 0x1815,
0x0425, 0x0425, 0x0425, 0x0425,
0x1415, 0x1415, 0x1415, 0x1415,
0x3417, 0x0067, 0x3017, 0x2c17,
0x0c27, 0x0437, 0x0057, 0x2817,
0x0034, 0x0034, 0x0034, 0x0034,
0x0034, 0x0034, 0x0034, 0x0034,
0x1014, 0x1014, 0x1014, 0x1014,
0x1014, 0x1014, 0x1014, 0x1014,
0x0c14, 0x0c14, 0x0c14, 0x0c14,
0x0c14, 0x0c14, 0x0c14, 0x0c14,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0xfbe1, 0xfbe1, 0xfbe1, 0xfbe1,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
0x0011, 0x0011, 0x0011, 0x0011,
};
unsigned short int dct_coeff_first[256] =
{
0xffff, 0xffff, 0xffff, 0xffff,
0xf7d5, 0xf7d5, 0xf7d5, 0xf7d5,
0x0826, 0x0826, 0x2416, 0x2416,
0x0046, 0x0046, 0x2016, 0x2016,
0x1c15, 0x1c15, 0x1c15, 0x1c15,
0x1815, 0x1815, 0x1815, 0x1815,
0x0425, 0x0425, 0x0425, 0x0425,
0x1415, 0x1415, 0x1415, 0x1415,
0x3417, 0x0067, 0x3017, 0x2c17,
0x0c27, 0x0437, 0x0057, 0x2817,
0x0034, 0x0034, 0x0034, 0x0034,
0x0034, 0x0034, 0x0034, 0x0034,
0x1014, 0x1014, 0x1014, 0x1014,
0x1014, 0x1014, 0x1014, 0x1014,
0x0c14, 0x0c14, 0x0c14, 0x0c14,
0x0c14, 0x0c14, 0x0c14, 0x0c14,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0023, 0x0023, 0x0023, 0x0023,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0813, 0x0813, 0x0813, 0x0813,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0412, 0x0412, 0x0412, 0x0412,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
0x0010, 0x0010, 0x0010, 0x0010,
};
/* Macro for filling up the decoding table for mb_addr_inc */
#define ASSIGN1(start, end, step, val, num) \
for (i = start; i < end; i+= step) { \
for (j = 0; j < step; j++) { \
mb_addr_inc[i+j].value = val; \
mb_addr_inc[i+j].num_bits = num; \
} \
val--; \
}
/*
*--------------------------------------------------------------
*
* init_mb_addr_inc --
*
* Initialize the VLC decoding table for macro_block_address_increment
*
* Results:
* The decoding table for macro_block_address_increment will
* be filled; illegal values will be filled as MPGDECODE_ERROR.
*
* Side effects:
* The global array mb_addr_inc will be filled.
*
*--------------------------------------------------------------
*/
static void init_mb_addr_inc()
{
int i, j, val;
for (i = 0; i < 8; i++) {
mb_addr_inc[i].value = MPGDECODE_ERROR;
mb_addr_inc[i].num_bits = 0;
}
mb_addr_inc[8].value = MACRO_BLOCK_ESCAPE;
mb_addr_inc[8].num_bits = 11;
for (i = 9; i < 15; i++) {
mb_addr_inc[i].value = MPGDECODE_ERROR;
mb_addr_inc[i].num_bits = 0;
}
mb_addr_inc[15].value = MACRO_BLOCK_STUFFING;
mb_addr_inc[15].num_bits = 11;
for (i = 16; i < 24; i++) {
mb_addr_inc[i].value = MPGDECODE_ERROR;
mb_addr_inc[i].num_bits = 0;
}
val = 33;
ASSIGN1(24, 36, 1, val, 11);
ASSIGN1(36, 48, 2, val, 10);
ASSIGN1(48, 96, 8, val, 8);
ASSIGN1(96, 128, 16, val, 7);
ASSIGN1(128, 256, 64, val, 5);
ASSIGN1(256, 512, 128, val, 4);
ASSIGN1(512, 1024, 256, val, 3);
ASSIGN1(1024, 2048, 1024, val, 1);
}
/* Macro for filling up the decoding table for mb_type */
#define ASSIGN2(start, end, quant, motion_forward, motion_backward, pattern, intra, num, mb_type) \
for (i = start; i < end; i ++) { \
mb_type[i].mb_quant = quant; \
mb_type[i].mb_motion_forward = motion_forward; \
mb_type[i].mb_motion_backward = motion_backward; \
mb_type[i].mb_pattern = pattern; \
mb_type[i].mb_intra = intra; \
mb_type[i].num_bits = num; \
}
/*
*--------------------------------------------------------------
*
* init_mb_type_P --
*
* Initialize the VLC decoding table for macro_block_type in
* predictive-coded pictures.
*
* Results:
* The decoding table for macro_block_type in predictive-coded
* pictures will be filled; illegal values will be filled as MPGDECODE_ERROR.
*
* Side effects:
* The global array mb_type_P will be filled.
*
*--------------------------------------------------------------
*/
static void init_mb_type_P() {
int i;
mb_type_P[0].mb_quant = mb_type_P[0].mb_motion_forward
= mb_type_P[0].mb_motion_backward = mb_type_P[0].mb_pattern
= mb_type_P[0].mb_intra = (unsigned int)MPGDECODE_ERROR;
mb_type_P[0].num_bits = 0;
ASSIGN2(1, 2, 1, 0, 0, 0, 1, 6, mb_type_P)
ASSIGN2(2, 4, 1, 0, 0, 1, 0, 5, mb_type_P)
ASSIGN2(4, 6, 1, 1, 0, 1, 0, 5, mb_type_P);
ASSIGN2(6, 8, 0, 0, 0, 0, 1, 5, mb_type_P);
ASSIGN2(8, 16, 0, 1, 0, 0, 0, 3, mb_type_P);
ASSIGN2(16, 32, 0, 0, 0, 1, 0, 2, mb_type_P);
ASSIGN2(32, 64, 0, 1, 0, 1, 0, 1, mb_type_P);
}
/*
*--------------------------------------------------------------
*
* init_mb_type_B --
*
* Initialize the VLC decoding table for macro_block_type in
* bidirectionally-coded pictures.
*
* Results:
* The decoding table for macro_block_type in bidirectionally-coded
* pictures will be filled; illegal values will be filled as MPGDECODE_ERROR.
*
* Side effects:
* The global array mb_type_B will be filled.
*
*--------------------------------------------------------------
*/
static void init_mb_type_B() {
int i;
mb_type_B[0].mb_quant = mb_type_B[0].mb_motion_forward
= mb_type_B[0].mb_motion_backward = mb_type_B[0].mb_pattern
= mb_type_B[0].mb_intra = (unsigned int) MPGDECODE_ERROR;
mb_type_B[0].num_bits = 0;
ASSIGN2(1, 2, 1, 0, 0, 0, 1, 6, mb_type_B);
ASSIGN2(2, 3, 1, 0, 1, 1, 0, 6, mb_type_B);
ASSIGN2(3, 4, 1, 1, 0, 1, 0, 6, mb_type_B);
ASSIGN2(4, 6, 1, 1, 1, 1, 0, 5, mb_type_B);
ASSIGN2(6, 8, 0, 0, 0, 0, 1, 5, mb_type_B);
ASSIGN2(8, 12, 0, 1, 0, 0, 0, 4, mb_type_B);
ASSIGN2(12, 16, 0, 1, 0, 1, 0, 4, mb_type_B);
ASSIGN2(16, 24, 0, 0, 1, 0, 0, 3, mb_type_B);
ASSIGN2(24, 32, 0, 0, 1, 1, 0, 3, mb_type_B);
ASSIGN2(32, 48, 0, 1, 1, 0, 0, 2, mb_type_B);
ASSIGN2(48, 64, 0, 1, 1, 1, 0, 2, mb_type_B);
}
/* Macro for filling up the decoding tables for motion_vectors */
#define ASSIGN3(start, end, step, val, num) \
for (i = start; i < end; i+= step) { \
for (j = 0; j < step / 2; j++) { \
motion_vectors[i+j].code = val; \
motion_vectors[i+j].num_bits = num; \
} \
for (j = step / 2; j < step; j++) { \
motion_vectors[i+j].code = -val; \
motion_vectors[i+j].num_bits = num; \
} \
val--; \
}
/*
*--------------------------------------------------------------
*
* init_motion_vectors --
*
* Initialize the VLC decoding table for the various motion
* vectors, including motion_horizontal_forward_code,
* motion_vertical_forward_code, motion_horizontal_backward_code,
* and motion_vertical_backward_code.
*
* Results:
* The decoding table for the motion vectors will be filled;
* illegal values will be filled as MPGDECODE_ERROR.
*
* Side effects:
* The global array motion_vector will be filled.
*
*--------------------------------------------------------------
*/
static void init_motion_vectors()
{
int i, j, val = 16;
for (i = 0; i < 24; i++) {
motion_vectors[i].code = MPGDECODE_ERROR;
motion_vectors[i].num_bits = 0;
}
ASSIGN3(24, 36, 2, val, 11);
ASSIGN3(36, 48, 4, val, 10);
ASSIGN3(48, 96, 16, val, 8);
ASSIGN3(96, 128, 32, val, 7);
ASSIGN3(128, 256, 128, val, 5);
ASSIGN3(256, 512, 256, val, 4);
ASSIGN3(512, 1024, 512, val, 3);
ASSIGN3(1024, 2048, 1024, val, 1);
}
extern void init_pre_idct();
/*
*--------------------------------------------------------------
*
* init_tables --
*
* Initialize all the tables for VLC decoding; this must be
* called when the system is set up before any decoding can
* take place.
*
* Results:
* All the decoding tables will be filled accordingly.
*
* Side effects:
* The corresponding global array for each decoding table
* will be filled.
*
*--------------------------------------------------------------
*/
void init_tables() {
init_mb_addr_inc();
init_mb_type_P();
init_mb_type_B();
init_motion_vectors();
if (qualityFlag) {
cout << "qualityFlag in init_tables float idct removed"<<endl;
}
init_pre_idct();
}
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