libavcodec/mpeg12decdata.h

   1 /*
   2  * MPEG1/2 decoder tables
   3  * copyright (c) 2000,2001 Fabrice Bellard
   4  * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG1/2 decoder tables.
  26  */
  27
  28 #ifndef AVCODEC_MPEG12DECDATA_H
  29 #define AVCODEC_MPEG12DECDATA_H
  30
  31 #include <stdint.h>
  32 #include "mpegvideo.h"
  33
  34
  35 #define MB_TYPE_ZERO_MV   0x20000000
  36 #define IS_ZERO_MV(a)   ((a)&MB_TYPE_ZERO_MV)
  37
  38 static const uint8_t table_mb_ptype[7][2] = {
  39     { 3, 5 }, // 0x01 MB_INTRA
  40     { 1, 2 }, // 0x02 MB_PAT
  41     { 1, 3 }, // 0x08 MB_FOR
  42     { 1, 1 }, // 0x0A MB_FOR|MB_PAT
  43     { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
  44     { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
  45     { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
  46 };
  47
  48 static const uint32_t ptype2mb_type[7] = {
  49                     MB_TYPE_INTRA,
  50                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  51                     MB_TYPE_L0,
  52                     MB_TYPE_L0 | MB_TYPE_CBP,
  53     MB_TYPE_QUANT | MB_TYPE_INTRA,
  54     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  55     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  56 };
  57
  58 static const uint8_t table_mb_btype[11][2] = {
  59     { 3, 5 }, // 0x01 MB_INTRA
  60     { 2, 3 }, // 0x04 MB_BACK
  61     { 3, 3 }, // 0x06 MB_BACK|MB_PAT
  62     { 2, 4 }, // 0x08 MB_FOR
  63     { 3, 4 }, // 0x0A MB_FOR|MB_PAT
  64     { 2, 2 }, // 0x0C MB_FOR|MB_BACK
  65     { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
  66     { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
  67     { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
  68     { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
  69     { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
  70 };
  71
  72 static const uint32_t btype2mb_type[11] = {
  73                     MB_TYPE_INTRA,
  74                     MB_TYPE_L1,
  75                     MB_TYPE_L1   | MB_TYPE_CBP,
  76                     MB_TYPE_L0,
  77                     MB_TYPE_L0   | MB_TYPE_CBP,
  78                     MB_TYPE_L0L1,
  79                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  80     MB_TYPE_QUANT | MB_TYPE_INTRA,
  81     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  82     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  83     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  84 };
  85
  86 static const uint8_t non_linear_qscale[32] = {
  87     0, 1, 2, 3, 4, 5, 6, 7,
  88     8,10,12,14,16,18,20,22,
  89     24,28,32,36,40,44,48,52,
  90     56,64,72,80,88,96,104,112,
  91 };
  92
  93 #endif /* AVCODEC_MPEG12DECDATA_H */