mpeg4data.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS and its licensors.
** All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See below for additional copyright and license information
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
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**********************************************************************/
/**
 * @file mpeg4data.h
 * mpeg4 tables.
 */

// shapes
#define RECT_SHAPE       0
#define BIN_SHAPE        1
#define BIN_ONLY_SHAPE   2
#define GRAY_SHAPE       3

#define SIMPLE_VO_TYPE             1
#define CORE_VO_TYPE               3
#define MAIN_VO_TYPE               4
#define NBIT_VO_TYPE               5
#define ARTS_VO_TYPE               10
#define ACE_VO_TYPE                12
#define ADV_SIMPLE_VO_TYPE         17

// aspect_ratio_info
#define EXTENDED_PAR 15

//vol_sprite_usage / sprite_enable
#define STATIC_SPRITE 1
#define GMC_SPRITE 2

#define MOTION_MARKER 0x1F001
#define DC_MARKER     0x6B001

static const int mb_type_b_map[4]= {
    MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
    MB_TYPE_L0L1 | MB_TYPE_16x16,
    MB_TYPE_L1 | MB_TYPE_16x16,
    MB_TYPE_L0 | MB_TYPE_16x16,
};

#define VOS_STARTCODE        0x1B0
#define USER_DATA_STARTCODE  0x1B2
#define GOP_STARTCODE        0x1B3
#define VISUAL_OBJ_STARTCODE 0x1B5
#define VOP_STARTCODE        0x1B6

/* dc encoding for mpeg4 */
const uint8_t DCtab_lum[13][2] =
{
    {3,3}, {3,2}, {2,2}, {2,3}, {1,3}, {1,4}, {1,5}, {1,6}, {1,7},
    {1,8}, {1,9}, {1,10}, {1,11},
}; 

const uint8_t DCtab_chrom[13][2] =
{
    {3,2}, {2,2}, {1,2}, {1,3}, {1,4}, {1,5}, {1,6}, {1,7}, {1,8},
    {1,9}, {1,10}, {1,11}, {1,12},
}; 

const uint16_t intra_vlc[103][2] = {
{ 0x2, 2 },
{ 0x6, 3 },{ 0xf, 4 },{ 0xd, 5 },{ 0xc, 5 },
{ 0x15, 6 },{ 0x13, 6 },{ 0x12, 6 },{ 0x17, 7 },
{ 0x1f, 8 },{ 0x1e, 8 },{ 0x1d, 8 },{ 0x25, 9 },
{ 0x24, 9 },{ 0x23, 9 },{ 0x21, 9 },{ 0x21, 10 },
{ 0x20, 10 },{ 0xf, 10 },{ 0xe, 10 },{ 0x7, 11 },
{ 0x6, 11 },{ 0x20, 11 },{ 0x21, 11 },{ 0x50, 12 },
{ 0x51, 12 },{ 0x52, 12 },{ 0xe, 4 },{ 0x14, 6 },
{ 0x16, 7 },{ 0x1c, 8 },{ 0x20, 9 },{ 0x1f, 9 },
{ 0xd, 10 },{ 0x22, 11 },{ 0x53, 12 },{ 0x55, 12 },
{ 0xb, 5 },{ 0x15, 7 },{ 0x1e, 9 },{ 0xc, 10 },
{ 0x56, 12 },{ 0x11, 6 },{ 0x1b, 8 },{ 0x1d, 9 },
{ 0xb, 10 },{ 0x10, 6 },{ 0x22, 9 },{ 0xa, 10 },
{ 0xd, 6 },{ 0x1c, 9 },{ 0x8, 10 },{ 0x12, 7 },
{ 0x1b, 9 },{ 0x54, 12 },{ 0x14, 7 },{ 0x1a, 9 },
{ 0x57, 12 },{ 0x19, 8 },{ 0x9, 10 },{ 0x18, 8 },
{ 0x23, 11 },{ 0x17, 8 },{ 0x19, 9 },{ 0x18, 9 },
{ 0x7, 10 },{ 0x58, 12 },{ 0x7, 4 },{ 0xc, 6 },
{ 0x16, 8 },{ 0x17, 9 },{ 0x6, 10 },{ 0x5, 11 },
{ 0x4, 11 },{ 0x59, 12 },{ 0xf, 6 },{ 0x16, 9 },
{ 0x5, 10 },{ 0xe, 6 },{ 0x4, 10 },{ 0x11, 7 },
{ 0x24, 11 },{ 0x10, 7 },{ 0x25, 11 },{ 0x13, 7 },
{ 0x5a, 12 },{ 0x15, 8 },{ 0x5b, 12 },{ 0x14, 8 },
{ 0x13, 8 },{ 0x1a, 8 },{ 0x15, 9 },{ 0x14, 9 },
{ 0x13, 9 },{ 0x12, 9 },{ 0x11, 9 },{ 0x26, 11 },
{ 0x27, 11 },{ 0x5c, 12 },{ 0x5d, 12 },{ 0x5e, 12 },
{ 0x5f, 12 },{ 0x3, 7 },
};

const int8_t intra_level[102] = {
  1,  2,  3,  4,  5,  6,  7,  8,
  9, 10, 11, 12, 13, 14, 15, 16,
 17, 18, 19, 20, 21, 22, 23, 24,
 25, 26, 27,  1,  2,  3,  4,  5,
  6,  7,  8,  9, 10,  1,  2,  3,
  4,  5,  1,  2,  3,  4,  1,  2,
  3,  1,  2,  3,  1,  2,  3,  1,
  2,  3,  1,  2,  1,  2,  1,  1,
  1,  1,  1,  1,  2,  3,  4,  5,
  6,  7,  8,  1,  2,  3,  1,  2,
  1,  2,  1,  2,  1,  2,  1,  2,
  1,  1,  1,  1,  1,  1,  1,  1,
  1,  1,  1,  1,  1,  1,
};

const int8_t intra_run[102] = {
  0,  0,  0,  0,  0,  0,  0,  0,
  0,  0,  0,  0,  0,  0,  0,  0,
  0,  0,  0,  0,  0,  0,  0,  0,
  0,  0,  0,  1,  1,  1,  1,  1,
  1,  1,  1,  1,  1,  2,  2,  2,
  2,  2,  3,  3,  3,  3,  4,  4,
  4,  5,  5,  5,  6,  6,  6,  7,
  7,  7,  8,  8,  9,  9, 10, 11,
 12, 13, 14,  0,  0,  0,  0,  0,
  0,  0,  0,  1,  1,  1,  2,  2,
  3,  3,  4,  4,  5,  5,  6,  6,
  7,  8,  9, 10, 11, 12, 13, 14,
 15, 16, 17, 18, 19, 20,
};

static RLTable rl_intra = {
    102,
    67,
    intra_vlc,
    intra_run,
    intra_level,
};

static const uint16_t inter_rvlc[170][2]={ //note this is identical to the intra rvlc except that its reordered
{0x0006,  3},{0x0001,  4},{0x0004,  5},{0x001C,  7},
{0x003C,  8},{0x003D,  8},{0x007C,  9},{0x00FC, 10},
{0x00FD, 10},{0x01FC, 11},{0x01FD, 11},{0x03FC, 12},
{0x07FC, 13},{0x07FD, 13},{0x0BFC, 13},{0x0BFD, 13},
{0x0FFC, 14},{0x0FFD, 14},{0x1FFC, 15},{0x0007,  3},
{0x000C,  6},{0x005C,  8},{0x007D,  9},{0x017C, 10},
{0x02FC, 11},{0x03FD, 12},{0x0DFC, 13},{0x17FC, 14},
{0x17FD, 14},{0x000A,  4},{0x001D,  7},{0x00BC,  9},
{0x02FD, 11},{0x05FC, 12},{0x1BFC, 14},{0x1BFD, 14},
{0x0005,  5},{0x005D,  8},{0x017D, 10},{0x05FD, 12},
{0x0DFD, 13},{0x1DFC, 14},{0x1FFD, 15},{0x0008,  5},
{0x006C,  8},{0x037C, 11},{0x0EFC, 13},{0x2FFC, 15},
{0x0009,  5},{0x00BD,  9},{0x037D, 11},{0x0EFD, 13},
{0x000D,  6},{0x01BC, 10},{0x06FC, 12},{0x1DFD, 14},
{0x0014,  6},{0x01BD, 10},{0x06FD, 12},{0x2FFD, 15},
{0x0015,  6},{0x01DC, 10},{0x0F7C, 13},{0x002C,  7},
{0x01DD, 10},{0x1EFC, 14},{0x002D,  7},{0x03BC, 11},
{0x0034,  7},{0x077C, 12},{0x006D,  8},{0x0F7D, 13},
{0x0074,  8},{0x1EFD, 14},{0x0075,  8},{0x1F7C, 14},
{0x00DC,  9},{0x1F7D, 14},{0x00DD,  9},{0x1FBC, 14},
{0x00EC,  9},{0x37FC, 15},{0x01EC, 10},{0x01ED, 10},
{0x01F4, 10},{0x03BD, 11},{0x03DC, 11},{0x03DD, 11},
{0x03EC, 11},{0x03ED, 11},{0x03F4, 11},{0x077D, 12},
{0x07BC, 12},{0x07BD, 12},{0x0FBC, 13},{0x0FBD, 13},
{0x0FDC, 13},{0x0FDD, 13},{0x1FBD, 14},{0x1FDC, 14},
{0x1FDD, 14},{0x37FD, 15},{0x3BFC, 15},
{0x000B,  4},{0x0078,  8},{0x03F5, 11},{0x0FEC, 13},
{0x1FEC, 14},{0x0012,  5},{0x00ED,  9},{0x07DC, 12},
{0x1FED, 14},{0x3BFD, 15},{0x0013,  5},{0x03F8, 11},
{0x3DFC, 15},{0x0018,  6},{0x07DD, 12},{0x0019,  6},
{0x07EC, 12},{0x0022,  6},{0x0FED, 13},{0x0023,  6},
{0x0FF4, 13},{0x0035,  7},{0x0FF5, 13},{0x0038,  7},
{0x0FF8, 13},{0x0039,  7},{0x0FF9, 13},{0x0042,  7},
{0x1FF4, 14},{0x0043,  7},{0x1FF5, 14},{0x0079,  8},
{0x1FF8, 14},{0x0082,  8},{0x3DFD, 15},{0x0083,  8},
{0x00F4,  9},{0x00F5,  9},{0x00F8,  9},{0x00F9,  9},
{0x0102,  9},{0x0103,  9},{0x01F5, 10},{0x01F8, 10},
{0x01F9, 10},{0x0202, 10},{0x0203, 10},{0x03F9, 11},
{0x0402, 11},{0x0403, 11},{0x07ED, 12},{0x07F4, 12},
{0x07F5, 12},{0x07F8, 12},{0x07F9, 12},{0x0802, 12},
{0x0803, 12},{0x1002, 13},{0x1003, 13},{0x1FF9, 14},
{0x2002, 14},{0x2003, 14},{0x3EFC, 15},{0x3EFD, 15},
{0x3F7C, 15},{0x3F7D, 15},{0x0000, 4}
};

static const uint8_t inter_rvlc_run[169]={
 0,  0,  0,  0,  0,  0,  0,  0, 
 0,  0,  0,  0,  0,  0,  0,  0, 
 0,  0,  0,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  2,  2,  2, 
 2,  2,  2,  2,  3,  3,  3,  3, 
 3,  3,  3,  4,  4,  4,  4,  4, 
 5,  5,  5,  5,  6,  6,  6,  6, 
 7,  7,  7,  7,  8,  8,  8,  9, 
 9,  9, 10, 10, 11, 11, 12, 12, 
13, 13, 14, 14, 15, 15, 16, 16, 
17, 17, 18, 19, 20, 21, 22, 23, 
24, 25, 26, 27, 28, 29, 30, 31, 
32, 33, 34, 35, 36, 37, 38, 
 0,  0,  0,  0,  0,  1,  1,  1, 
 1,  1,  2,  2,  2,  3,  3,  4, 
 4,  5,  5,  6,  6,  7,  7,  8, 
 8,  9,  9, 10, 10, 11, 11, 12, 
12, 13, 13, 14, 15, 16, 17, 18, 
19, 20, 21, 22, 23, 24, 25, 26, 
27, 28, 29, 30, 31, 32, 33, 34, 
35, 36, 37, 38, 39, 40, 41, 42, 
43, 44,  
};

static const uint8_t inter_rvlc_level[169]={
 1,  2,  3,  4,  5,  6,  7,  8, 
 9, 10, 11, 12, 13, 14, 15, 16, 
17, 18, 19,  1,  2,  3,  4,  5, 
 6,  7,  8,  9, 10,  1,  2,  3, 
 4,  5,  6,  7,  1,  2,  3,  4, 
 5,  6,  7,  1,  2,  3,  4,  5, 
 1,  2,  3,  4,  1,  2,  3,  4, 
 1,  2,  3,  4,  1,  2,  3,  1, 
 2,  3,  1,  2,  1,  2,  1,  2, 
 1,  2,  1,  2,  1,  2,  1,  2, 
 1,  2,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1, 
 1,  2,  3,  4,  5,  1,  2,  3, 
 4,  5,  1,  2,  3,  1,  2,  1, 
 2,  1,  2,  1,  2,  1,  2,  1, 
 2,  1,  2,  1,  2,  1,  2,  1, 
 2,  1,  2,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1, 
};

static RLTable rvlc_rl_inter = {
    169,
    103,
    inter_rvlc,
    inter_rvlc_run,
    inter_rvlc_level,
};

static const uint16_t intra_rvlc[170][2]={
{0x0006,  3},{0x0007,  3},{0x000A,  4},{0x0009,  5},
{0x0014,  6},{0x0015,  6},{0x0034,  7},{0x0074,  8},
{0x0075,  8},{0x00DD,  9},{0x00EC,  9},{0x01EC, 10},
{0x01ED, 10},{0x01F4, 10},{0x03EC, 11},{0x03ED, 11},
{0x03F4, 11},{0x077D, 12},{0x07BC, 12},{0x0FBD, 13},
{0x0FDC, 13},{0x07BD, 12},{0x0FDD, 13},{0x1FBD, 14},
{0x1FDC, 14},{0x1FDD, 14},{0x1FFC, 15},{0x0001,  4},
{0x0008,  5},{0x002D,  7},{0x006C,  8},{0x006D,  8},
{0x00DC,  9},{0x01DD, 10},{0x03DC, 11},{0x03DD, 11},
{0x077C, 12},{0x0FBC, 13},{0x1F7D, 14},{0x1FBC, 14},
{0x0004,  5},{0x002C,  7},{0x00BC,  9},{0x01DC, 10},
{0x03BC, 11},{0x03BD, 11},{0x0EFD, 13},{0x0F7C, 13},
{0x0F7D, 13},{0x1EFD, 14},{0x1F7C, 14},{0x0005,  5},
{0x005C,  8},{0x00BD,  9},{0x037D, 11},{0x06FC, 12},
{0x0EFC, 13},{0x1DFD, 14},{0x1EFC, 14},{0x1FFD, 15},
{0x000C,  6},{0x005D,  8},{0x01BD, 10},{0x03FD, 12},
{0x06FD, 12},{0x1BFD, 14},{0x000D,  6},{0x007D,  9},
{0x02FC, 11},{0x05FC, 12},{0x1BFC, 14},{0x1DFC, 14},
{0x001C,  7},{0x017C, 10},{0x02FD, 11},{0x05FD, 12},
{0x2FFC, 15},{0x001D,  7},{0x017D, 10},{0x037C, 11},
{0x0DFD, 13},{0x2FFD, 15},{0x003C,  8},{0x01BC, 10},
{0x0BFD, 13},{0x17FD, 14},{0x003D,  8},{0x01FD, 11},
{0x0DFC, 13},{0x37FC, 15},{0x007C,  9},{0x03FC, 12},
{0x00FC, 10},{0x0BFC, 13},{0x00FD, 10},{0x37FD, 15},
{0x01FC, 11},{0x07FC, 13},{0x07FD, 13},{0x0FFC, 14},
{0x0FFD, 14},{0x17FC, 14},{0x3BFC, 15},
{0x000B,  4},{0x0078,  8},{0x03F5, 11},{0x0FEC, 13},
{0x1FEC, 14},{0x0012,  5},{0x00ED,  9},{0x07DC, 12},
{0x1FED, 14},{0x3BFD, 15},{0x0013,  5},{0x03F8, 11},
{0x3DFC, 15},{0x0018,  6},{0x07DD, 12},{0x0019,  6},
{0x07EC, 12},{0x0022,  6},{0x0FED, 13},{0x0023,  6},
{0x0FF4, 13},{0x0035,  7},{0x0FF5, 13},{0x0038,  7},
{0x0FF8, 13},{0x0039,  7},{0x0FF9, 13},{0x0042,  7},
{0x1FF4, 14},{0x0043,  7},{0x1FF5, 14},{0x0079,  8},
{0x1FF8, 14},{0x0082,  8},{0x3DFD, 15},{0x0083,  8},
{0x00F4,  9},{0x00F5,  9},{0x00F8,  9},{0x00F9,  9},
{0x0102,  9},{0x0103,  9},{0x01F5, 10},{0x01F8, 10},
{0x01F9, 10},{0x0202, 10},{0x0203, 10},{0x03F9, 11},
{0x0402, 11},{0x0403, 11},{0x07ED, 12},{0x07F4, 12},
{0x07F5, 12},{0x07F8, 12},{0x07F9, 12},{0x0802, 12},
{0x0803, 12},{0x1002, 13},{0x1003, 13},{0x1FF9, 14},
{0x2002, 14},{0x2003, 14},{0x3EFC, 15},{0x3EFD, 15},
{0x3F7C, 15},{0x3F7D, 15},{0x0000,  4}
};

static const uint8_t intra_rvlc_run[169]={
 0,  0,  0,  0,  0,  0,  0,  0, 
 0,  0,  0,  0,  0,  0,  0,  0, 
 0,  0,  0,  0,  0,  0,  0,  0, 
 0,  0,  0,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 2,  2,  2,  2,  2,  2,  2,  2, 
 2,  2,  2,  3,  3,  3,  3,  3, 
 3,  3,  3,  3,  4,  4,  4,  4, 
 4,  4,  5,  5,  5,  5,  5,  5, 
 6,  6,  6,  6,  6,  7,  7,  7, 
 7,  7,  8,  8,  8,  8,  9,  9, 
 9,  9, 10, 10, 11, 11, 12, 12, 
13, 14, 15, 16, 17, 18, 19, 
 0,  0,  0,  0,  0,  1,  1,  1, 
 1,  1,  2,  2,  2,  3,  3,  4, 
 4,  5,  5,  6,  6,  7,  7,  8, 
 8,  9,  9, 10, 10, 11, 11, 12, 
12, 13, 13, 14, 15, 16, 17, 18, 
19, 20, 21, 22, 23, 24, 25, 26, 
27, 28, 29, 30, 31, 32, 33, 34, 
35, 36, 37, 38, 39, 40, 41, 42, 
43, 44, 
};

static const uint8_t intra_rvlc_level[169]={
 1,  2,  3,  4,  5,  6,  7,  8, 
 9, 10, 11, 12, 13, 14, 15, 16, 
17, 18, 19, 20, 21, 22, 23, 24, 
25, 26, 27,  1,  2,  3,  4,  5, 
 6,  7,  8,  9, 10, 11, 12, 13, 
 1,  2,  3,  4,  5,  6,  7,  8, 
 9, 10, 11,  1,  2,  3,  4,  5, 
 6,  7,  8,  9,  1,  2,  3,  4, 
 5,  6,  1,  2,  3,  4,  5,  6, 
 1,  2,  3,  4,  5,  1,  2,  3, 
 4,  5,  1,  2,  3,  4,  1,  2, 
 3,  4,  1,  2,  1,  2,  1,  2, 
 1,  1,  1,  1,  1,  1,  1,  
 1,  2,  3,  4,  5,  1,  2,  3, 
 4,  5,  1,  2,  3,  1,  2,  1, 
 2,  1,  2,  1,  2,  1,  2,  1, 
 2,  1,  2,  1,  2,  1,  2,  1, 
 2,  1,  2,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1,  1,  1,  1,  1,  1,  1, 
 1,  1, 
};

static RLTable rvlc_rl_intra = {
    169,
    103,
    intra_rvlc,
    intra_rvlc_run,
    intra_rvlc_level,
};

static const uint16_t sprite_trajectory_tab[15][2] = {
 {0x00, 2}, {0x02, 3},  {0x03, 3},  {0x04, 3}, {0x05, 3}, {0x06, 3},
 {0x0E, 4}, {0x1E, 5},  {0x3E, 6},  {0x7E, 7}, {0xFE, 8}, 
 {0x1FE, 9},{0x3FE, 10},{0x7FE, 11},{0xFFE, 12},
};

static const uint8_t mb_type_b_tab[4][2] = {
 {1, 1}, {1, 2}, {1, 3}, {1, 4},
};

static const AVRational pixel_aspect[16]={
 {0, 1},
 {1, 1},
 {12, 11},
 {10, 11},
 {16, 11},
 {40, 33},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
 {0, 1},
};

/* these matrixes will be permuted for the idct */
const int16_t ff_mpeg4_default_intra_matrix[64] = {
  8, 17, 18, 19, 21, 23, 25, 27,
 17, 18, 19, 21, 23, 25, 27, 28,
 20, 21, 22, 23, 24, 26, 28, 30,
 21, 22, 23, 24, 26, 28, 30, 32,
 22, 23, 24, 26, 28, 30, 32, 35,
 23, 24, 26, 28, 30, 32, 35, 38,
 25, 26, 28, 30, 32, 35, 38, 41,
 27, 28, 30, 32, 35, 38, 41, 45, 
};

const int16_t ff_mpeg4_default_non_intra_matrix[64] = {
 16, 17, 18, 19, 20, 21, 22, 23,
 17, 18, 19, 20, 21, 22, 23, 24,
 18, 19, 20, 21, 22, 23, 24, 25,
 19, 20, 21, 22, 23, 24, 26, 27,
 20, 21, 22, 23, 25, 26, 27, 28,
 21, 22, 23, 24, 26, 27, 28, 30,
 22, 23, 24, 26, 27, 28, 30, 31,
 23, 24, 25, 27, 28, 30, 31, 33,
};

uint8_t ff_mpeg4_y_dc_scale_table[32]={
//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
    0, 8, 8, 8, 8,10,12,14,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,34,36,38,40,42,44,46
};
uint8_t ff_mpeg4_c_dc_scale_table[32]={
//  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
    0, 8, 8, 8, 8, 9, 9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,18,18,19,20,21,22,23,24,25
};

const uint16_t ff_mpeg4_resync_prefix[8]={
    0x7F00, 0x7E00, 0x7C00, 0x7800, 0x7000, 0x6000, 0x4000, 0x0000
};

static const uint8_t mpeg4_dc_threshold[8]={
    99, 13, 15, 17, 19, 21, 23, 0
};