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157 lines
5.0 KiB
C
157 lines
5.0 KiB
C
/*
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* copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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* copyright (c) 2004 Maarten Daniels
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.261 tables.
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*/
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#include <stdint.h>
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#include "mpegutils.h"
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#include "rl.h"
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#include "h261.h"
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// H.261 VLC table for macroblock addressing
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const uint8_t ff_h261_mba_code[35] = {
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1, 3, 2, 3,
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2, 3, 2, 7,
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6, 11, 10, 9,
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8, 7, 6, 23,
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22, 21, 20, 19,
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18, 35, 34, 33,
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32, 31, 30, 29,
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28, 27, 26, 25,
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24,
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15, // (MBA stuffing)
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1 // (start code)
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};
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const uint8_t ff_h261_mba_bits[35] = {
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1, 3, 3, 4,
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4, 5, 5, 7,
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7, 8, 8, 8,
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8, 8, 8, 10,
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10, 10, 10, 10,
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10, 11, 11, 11,
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11, 11, 11, 11,
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11, 11, 11, 11,
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11,
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11, // (MBA stuffing)
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16 // (start code)
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};
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// H.261 VLC table for macroblock type
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const uint8_t ff_h261_mtype_code[10] = {
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1, 1, 1, 1,
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1, 1, 1, 1,
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1, 1
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};
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const uint8_t ff_h261_mtype_bits[10] = {
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4, 7, 1, 5,
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9, 8, 10, 3,
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2, 6
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};
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const int ff_h261_mtype_map[10] = {
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MB_TYPE_INTRA4x4,
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MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
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MB_TYPE_CBP,
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MB_TYPE_CBP | MB_TYPE_QUANT,
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MB_TYPE_16x16,
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MB_TYPE_16x16 | MB_TYPE_CBP,
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MB_TYPE_16x16 | MB_TYPE_CBP | MB_TYPE_QUANT,
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MB_TYPE_16x16 | MB_TYPE_H261_FIL,
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MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP,
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MB_TYPE_16x16 | MB_TYPE_H261_FIL | MB_TYPE_CBP | MB_TYPE_QUANT
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};
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// H.261 VLC table for motion vectors
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const uint8_t ff_h261_mv_tab[17][2] = {
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{ 1, 1 }, { 1, 2 }, { 1, 3 }, { 1, 4 }, { 3, 6 }, { 5, 7 }, { 4, 7 }, { 3, 7 },
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{ 11, 9 }, { 10, 9 }, { 9, 9 }, { 17, 10 }, { 16, 10 }, { 15, 10 }, { 14, 10 }, { 13, 10 }, { 12, 10 }
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};
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// H.261 VLC table for coded block pattern
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const uint8_t ff_h261_cbp_tab[63][2] = {
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{ 11, 5 }, { 9, 5 }, { 13, 6 }, { 13, 4 }, { 23, 7 }, { 19, 7 }, { 31, 8 }, { 12, 4 },
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{ 22, 7 }, { 18, 7 }, { 30, 8 }, { 19, 5 }, { 27, 8 }, { 23, 8 }, { 19, 8 }, { 11, 4 },
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{ 21, 7 }, { 17, 7 }, { 29, 8 }, { 17, 5 }, { 25, 8 }, { 21, 8 }, { 17, 8 }, { 15, 6 },
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{ 15, 8 }, { 13, 8 }, { 3, 9 }, { 15, 5 }, { 11, 8 }, { 7, 8 }, { 7, 9 }, { 10, 4 },
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{ 20, 7 }, { 16, 7 }, { 28, 8 }, { 14, 6 }, { 14, 8 }, { 12, 8 }, { 2, 9 }, { 16, 5 },
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{ 24, 8 }, { 20, 8 }, { 16, 8 }, { 14, 5 }, { 10, 8 }, { 6, 8 }, { 6, 9 }, { 18, 5 },
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{ 26, 8 }, { 22, 8 }, { 18, 8 }, { 13, 5 }, { 9, 8 }, { 5, 8 }, { 5, 9 }, { 12, 5 },
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{ 8, 8 }, { 4, 8 }, { 4, 9 }, { 7, 3 }, { 10, 5 }, { 8, 5 }, { 12, 6 }
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};
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// H.261 VLC table for transform coefficients
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static const uint16_t h261_tcoeff_vlc[65][2] = {
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{ 0x2, 2 }, { 0x3, 2 }, { 0x4, 4 }, { 0x5, 5 },
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{ 0x6, 7 }, { 0x26, 8 }, { 0x21, 8 }, { 0xa, 10 },
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{ 0x1d, 12 }, { 0x18, 12 }, { 0x13, 12 }, { 0x10, 12 },
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{ 0x1a, 13 }, { 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
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{ 0x3, 3 }, { 0x6, 6 }, { 0x25, 8 }, { 0xc, 10 },
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{ 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4 },
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{ 0x4, 7 }, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
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{ 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
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{ 0x6, 5 }, { 0xf, 10 }, { 0x12, 12 }, { 0x7, 6 },
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{ 0x9, 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
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{ 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12 },
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{ 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
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{ 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe, 10 },
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{ 0xd, 10 }, { 0x8, 10 }, { 0x1f, 12 }, { 0x1a, 12 },
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{ 0x19, 12 }, { 0x17, 12 }, { 0x16, 12 }, { 0x1f, 13 },
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{ 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13 }, { 0x1b, 13 },
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{ 0x1, 6 } // escape
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};
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static const int8_t h261_tcoeff_level[64] = {
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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1, 2, 3, 4, 5, 6, 7, 1,
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2, 3, 4, 5, 1, 2, 3, 4,
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1, 2, 3, 1, 2, 3, 1, 2,
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1, 2, 1, 2, 1, 2, 1, 2,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1
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};
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static const int8_t h261_tcoeff_run[64] = {
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0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1,
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1, 1, 1, 1, 1, 1, 2, 2,
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2, 2, 2, 3, 3, 3, 3, 4,
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4, 4, 5, 5, 5, 6, 6, 7,
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7, 8, 8, 9, 9, 10, 10, 11,
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12, 13, 14, 15, 16, 17, 18, 19,
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20, 21, 22, 23, 24, 25, 26
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};
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RLTable ff_h261_rl_tcoeff = {
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64,
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64,
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h261_tcoeff_vlc,
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h261_tcoeff_run,
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h261_tcoeff_level,
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};
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