| 1 | /**
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| 2 | * @file h261data.h
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| 3 | * H.261 tables.
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| 4 | */
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| 5 | #define MB_TYPE_H261_FIL 0x800000
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| 6 |
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| 7 | // H.261 VLC table for macroblock addressing
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| 8 | const uint8_t h261_mba_code[35] = {
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| 9 | 1, 3, 2, 3,
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| 10 | 2, 3, 2, 7,
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| 11 | 6, 11, 10, 9,
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| 12 | 8, 7, 6, 23,
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| 13 | 22, 21, 20, 19,
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| 14 | 18, 35, 34, 33,
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| 15 | 32, 31, 30, 29,
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| 16 | 28, 27, 26, 25,
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| 17 | 24,
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| 18 | 15, //(MBA stuffing)
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| 19 | 1 //(start code)
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| 20 | };
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| 21 |
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| 22 | const uint8_t h261_mba_bits[35] = {
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| 23 | 1, 3, 3, 4,
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| 24 | 4, 5, 5, 7,
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| 25 | 7, 8, 8, 8,
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| 26 | 8, 8, 8, 10,
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| 27 | 10, 10, 10, 10,
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| 28 | 10, 11, 11, 11,
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| 29 | 11, 11, 11, 11,
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| 30 | 11, 11, 11, 11,
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| 31 | 11,
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| 32 | 11, //(MBA stuffing)
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| 33 | 16 //(start code)
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| 34 | };
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| 35 |
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| 36 | //H.261 VLC table for macroblock type
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| 37 | const uint8_t h261_mtype_code[10] = {
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| 38 | 1, 1, 1, 1,
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| 39 | 1, 1, 1, 1,
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| 40 | 1, 1
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| 41 | };
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| 42 |
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| 43 | const uint8_t h261_mtype_bits[10] = {
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| 44 | 4, 7, 1, 5,
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| 45 | 9, 8, 10, 3,
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| 46 | 2, 6
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| 47 | };
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| 48 |
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| 49 | static const int h261_mtype_map[10]= {
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| 50 | MB_TYPE_INTRA4x4,
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| 51 | MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
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| 52 | MB_TYPE_CBP,
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| 53 | MB_TYPE_QUANT | MB_TYPE_CBP,
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| 54 | MB_TYPE_16x16,
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| 55 | MB_TYPE_CBP | MB_TYPE_16x16,
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| 56 | MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16,
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| 57 | MB_TYPE_16x16 | MB_TYPE_H261_FIL,
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| 58 | MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL,
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| 59 | MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL
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| 60 | };
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| 61 |
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| 62 | //H.261 VLC table for motion vectors
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| 63 | const uint8_t h261_mv_tab[17][2] = {
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| 64 | {1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},
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| 65 | {11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10}, {12,10}
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| 66 | };
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| 67 |
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| 68 | static const int mvmap[17] =
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| 69 | {
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| 70 | 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16
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| 71 | };
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| 72 |
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| 73 | //H.261 VLC table for coded block pattern
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| 74 | const uint8_t h261_cbp_tab[63][2] =
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| 75 | {
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| 76 | {11,5}, {9,5}, {13,6}, {13,4}, {23,7}, {19,7}, {31,8}, {12,4},
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| 77 | {22,7}, {18,7}, {30,8}, {19,5}, {27,8}, {23,8}, {19,8}, {11,4},
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| 78 | {21,7}, {17,7}, {29,8}, {17,5}, {25,8}, {21,8}, {17,8}, {15,6},
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| 79 | {15,8}, {13,8}, {3,9}, {15,5}, {11,8}, {7,8}, {7,9}, {10,4},
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| 80 | {20,7}, {16,7}, {28,8}, {14,6}, {14,8}, {12,8}, {2,9}, {16,5},
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| 81 | {24,8}, {20,8}, {16,8}, {14,5}, {10,8}, {6,8}, {6,9}, {18,5},
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| 82 | {26,8}, {22,8}, {18,8}, {13,5}, {9,8}, {5,8}, {5,9}, {12,5},
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| 83 | {8,8}, {4,8}, {4,9}, {7,3}, {10,5}, {8,5}, {12,6}
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| 84 | };
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| 85 |
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| 86 | //H.261 VLC table for transform coefficients
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| 87 | const uint16_t h261_tcoeff_vlc[65][2] = {
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| 88 | { 0x2, 2 }, { 0x3, 2 },{ 0x4, 4 },{ 0x5, 5 },
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| 89 | { 0x6, 7 },{ 0x26, 8 },{ 0x21, 8 },{ 0xa, 10 },
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| 90 | { 0x1d, 12 },{ 0x18, 12 },{ 0x13, 12 },{ 0x10 , 12 },
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| 91 | { 0x1a, 13},{ 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
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| 92 | { 0x3, 3 }, { 0x6, 6 }, { 0x25 , 8 }, { 0xc, 10 },
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| 93 | { 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4},
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| 94 | { 0x4, 7}, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
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| 95 | { 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
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| 96 | { 0x6, 5 }, { 0xf, 10 }, { 0x12, 12}, { 0x7, 6},
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| 97 | { 0x9 , 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
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| 98 | { 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12},
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| 99 | { 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
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| 100 | { 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe , 10 },
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| 101 | { 0xd, 10 }, { 0x8, 10 },{ 0x1f, 12 }, { 0x1a, 12 },
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| 102 | { 0x19, 12 }, { 0x17, 12 }, { 0x16, 12}, { 0x1f, 13},
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| 103 | { 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13}, { 0x1b, 13},
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| 104 | { 0x1, 6 } //escape
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| 105 | };
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| 106 |
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| 107 | const int8_t h261_tcoeff_level[64] = {
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| 108 | 0, 1, 2, 3, 4, 5, 6, 7,
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| 109 | 8, 9, 10, 11, 12, 13, 14, 15,
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| 110 | 1, 2, 3, 4, 5, 6, 7, 1,
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| 111 | 2, 3, 4, 5, 1, 2, 3, 4,
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| 112 | 1, 2, 3, 1, 2, 3, 1, 2,
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| 113 | 1, 2, 1, 2, 1, 2, 1, 2,
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| 114 | 1, 1, 1, 1, 1, 1, 1, 1,
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| 115 | 1, 1, 1, 1, 1, 1, 1, 1
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| 116 | };
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| 117 |
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| 118 | const int8_t h261_tcoeff_run[64] = {
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| 119 | 0,
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| 120 | 0, 0, 0, 0, 0, 0, 0, 0,
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| 121 | 0, 0, 0, 0, 0, 0, 0, 1,
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| 122 | 1, 1, 1, 1, 1, 1, 2, 2,
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| 123 | 2, 2, 2, 3, 3, 3, 3, 4,
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| 124 | 4, 4, 5, 5, 5, 6, 6, 7,
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| 125 | 7, 8, 8, 9, 9, 10, 10, 11,
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| 126 | 12, 13, 14, 15, 16, 17, 18, 19,
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| 127 | 20, 21, 22, 23, 24, 25, 26
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| 128 | };
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| 129 |
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| 130 | static RLTable h261_rl_tcoeff = {
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| 131 | 64,
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| 132 | 64,
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| 133 | h261_tcoeff_vlc,
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| 134 | h261_tcoeff_run,
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| 135 | h261_tcoeff_level,
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| 136 | };
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