/************************************************************************ *VLC編碼表格 ************************************************************************//* type definitions for variable length code table entries */typedef struct{  unsigned int code; /* right justified */  int len;} VLCtable;/* Motion vectors */static VLCtable mvtab[33] ={  {1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},  {11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10},  {12,10}, {11,10}, {10,10}, {9,10}, {8,10}, {7,10}, {6,10}, {5,10},  {4,10}, {7,11}, {6,11}, {5,11}, {4,11}, {3,11}, {2,11}, {3,12},  {2,12}};/* CBPCM (MCBPC) Indexing by cbpc in first two bits, mode in last two. CBPC as in table 4/H.263, MB type (mode): 3 = 01, 4 = 10. Example: cbpc = 01 and mode = 4 gives index = 0110 = 6. */static VLCtable cbpcm_intra_tab[15] ={  {0x01,9}, {0x01,1}, {0x01,4}, {0x00,0},  {0x00,0}, {0x01,3}, {0x01,6}, {0x00,0},  {0x00,0}, {0x02,3}, {0x02,6}, {0x00,0},  {0x00,0}, {0x03,3}, {0x03,6}};/* CBPCM inter.   Addressing: 5 bit ccmmm (cc = CBPC, mmm = mode (1-4 binary)) */static VLCtable cbpcm_inter_tab[29] ={  {1,1}, {3,3}, {2,3}, {3,5}, {4,6}, {1,9}, {0,0}, {0,0},  {3,4}, {7,7}, {5,7}, {4,8}, {4,9}, {0,0}, {0,0}, {0,0},  {2,4}, {6,7}, {4,7}, {3,8}, {3,9}, {0,0}, {0,0}, {0,0},  {5,6}, {5,9}, {5,8}, {3,7}, {2,9}};/* CBPY. Straightforward indexing */static VLCtable cbpy_tab[16] ={  {3,4}, {5,5}, {4,5}, {9,4}, {3,5}, {7,4}, {2,6}, {11,4},  {2,5}, {3,6}, {5,4}, {10,4}, {4,4}, {8,4}, {6,4}, {3,2}};/* DCT coefficients. Four tables, two for last = 0, two for last = 1.   the sign bit must be added afterwards. *//* first part of coeffs for last = 0. Indexed by [run][level-1] */static VLCtable coeff_tab0[2][12] ={  /* run = 0 */  {    {0x02, 2}, {0x0f, 4}, {0x15, 6}, {0x17, 7},    {0x1f, 8}, {0x25, 9}, {0x24, 9}, {0x21,10},    {0x20,10}, {0x07,11}, {0x06,11}, {0x20,11}  },  /* run = 1 */  {    {0x06, 3}, {0x14, 6}, {0x1e, 8}, {0x0f,10},    {0x21,11}, {0x50,12}, {0x00, 0}, {0x00, 0},    {0x00, 0}, {0x00, 0}, {0x00, 0}, {0x00, 0}  }};/* rest of coeffs for last = 0. indexing by [run-2][level-1] */static VLCtable coeff_tab1[25][4] ={  /* run = 2 */  {    {0x0e, 4}, {0x1d, 8}, {0x0e,10}, {0x51,12}  },  /* run = 3 */  {    {0x0d, 5}, {0x23, 9}, {0x0d,10}, {0x00, 0}  },  /* run = 4-26 */  {    {0x0c, 5}, {0x22, 9}, {0x52,12}, {0x00, 0}  },  {    {0x0b, 5}, {0x0c,10}, {0x53,12}, {0x00, 0}  },  {    {0x13, 6}, {0x0b,10}, {0x54,12}, {0x00, 0}  },  {    {0x12, 6}, {0x0a,10}, {0x00, 0}, {0x00, 0}  },  {    {0x11, 6}, {0x09,10}, {0x00, 0}, {0x00, 0}  },  {    {0x10, 6}, {0x08,10}, {0x00, 0}, {0x00, 0}  },  {    {0x16, 7}, {0x55,12}, {0x00, 0}, {0x00, 0}  },  {    {0x15, 7}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x14, 7}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1c, 8}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1b, 8}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x21, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x20, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1f, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1e, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1d, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1c, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1b, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x1a, 9}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x22,11}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x23,11}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x56,12}, {0x00, 0}, {0x00, 0}, {0x00, 0}  },  {    {0x57,12}, {0x00, 0}, {0x00, 0}, {0x00, 0}  }};/* first coeffs of last = 1. indexing by [run][level-1] */static VLCtable coeff_tab2[2][3] ={  /* run = 0 */  {    {0x07, 4}, {0x19, 9}, {0x05,11}  },  /* run = 1 */  {    {0x0f, 6}, {0x04,11}, {0x00, 0}  }};/* rest of coeffs for last = 1. indexing by [run-2] */static VLCtable coeff_tab3[40] ={  {0x0e, 6}, {0x0d, 6}, {0x0c, 6},  {0x13, 7}, {0x12, 7}, {0x11, 7}, {0x10, 7},  {0x1a, 8}, {0x19, 8}, {0x18, 8}, {0x17, 8},  {0x16, 8}, {0x15, 8}, {0x14, 8}, {0x13, 8},  {0x18, 9}, {0x17, 9}, {0x16, 9}, {0x15, 9},      {0x14, 9}, {0x13, 9}, {0x12, 9}, {0x11, 9},      {0x07,10}, {0x06,10}, {0x05,10}, {0x04,10},      {0x24,11}, {0x25,11}, {0x26,11}, {0x27,11},      {0x58,12}, {0x59,12}, {0x5a,12}, {0x5b,12},      {0x5c,12}, {0x5d,12}, {0x5e,12}, {0x5f,12},  {0x00, 0}               };