vid_vlc.h

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/************************************************************************
 *
 *  vid_vlc.h, VLC tables for tmn (TMN encoder)
 *  Copyright (C) 1995, 1996  Telenor R&D, Norway
 *        Karl Olav Lillevold <Karl.Lillevold@nta.no>
 *  
 *  Contacts: 
 *  Karl Olav Lillevold               <Karl.Lillevold@nta.no>, or
 *  Robert Danielsen                  <Robert.Danielsen@nta.no>
 *
 *  Telenor Research and Development  http://www.nta.no/brukere/DVC/
 *  P.O.Box 83                        tel.:   +47 63 84 84 00
 *  N-2007 Kjeller, Norway            fax.:   +47 63 81 00 76
 *  
 ************************************************************************/

/*
 * Disclaimer of Warranty
 *
 * These software programs are available to the user without any
 * license fee or royalty on an "as is" basis.  Telenor Research and
 * Development disclaims any and all warranties, whether express,
 * implied, or statuary, including any implied warranties or
 * merchantability or of fitness for a particular purpose.  In no
 * event shall the copyright-holder be liable for any incidental,
 * punitive, or consequential damages of any kind whatsoever arising
 * from the use of these programs.
 *
 * This disclaimer of warranty extends to the user of these programs
 * and user's customers, employees, agents, transferees, successors,
 * and assigns.
 *
 * Telenor Research and Development does not represent or warrant that
 * the programs furnished hereunder are free of infringement of any
 * third-party patents.
 *
 * Commercial implementations of H.263, including shareware, are
 * subject to royalty fees to patent holders.  Many of these patents
 * are general enough such that they are unavoidable regardless of
 * implementation design.
 * */

/************************************************************************
 *        
 *  Author:     Robert.Danielsen@nta.no
 *  Date:       06.05.96
 *
 *  Comment:    struct idea from MPEG-2 Simulation Software Group.
 *        
 ************************************************************************/

/* 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}               
};

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