path: root/apps/plugins/iriver_flash.c

>"incorrect codes\n");
                        return -1;
                    }
                    table[j][1] = n; //bits
                    table[j][0] = symbol;
                    j++;
                }
            } else {
                n -= table_nb_bits;
                j = (code >> ((flags & INIT_VLC_LE) ? n_prefix : n)) & ((1 << table_nb_bits) - 1);
#ifdef DEBUG_VLC
                DEBUGF("%4x: n=%d (subtable)\n",
                       j, n);
#endif
                /* compute table size */
                n1 = -table[j][1]; //bits
                if (n > n1)
                    n1 = n;
                table[j][1] = -n1; //bits
            }
        }
    }

    /* second pass : fill auxillary tables recursively */
    for(i=0;i<table_size;i++) {
        n = table[i][1]; //bits
        if (n < 0) {
            n = -n;
            if (n > table_nb_bits) {
                n = table_nb_bits;
                table[i][1] = -n; //bits
            }
            index = build_table(vlc, n, nb_codes,
                                bits, bits_wrap, bits_size,
                                codes, codes_wrap, codes_size,
                                symbols, symbols_wrap, symbols_size,
                                (flags & INIT_VLC_LE) ? (code_prefix | (i << n_prefix)) : ((code_prefix << table_nb_bits) | i),
                                n_prefix + table_nb_bits, flags);
            if (index < 0)
                return -1;
            /* note: realloc has been done, so reload tables */
            table = &vlc->table[table_index];
            table[i][0] = index; //code
        }
    }
    return table_index;
}


/* Build VLC decoding tables suitable for use with get_vlc().

   'nb_bits' set thee decoding table size (2^nb_bits) entries. The
   bigger it is, the faster is the decoding. But it should not be too
   big to save memory and L1 cache. '9' is a good compromise.

   'nb_codes' : number of vlcs codes

   'bits' : table which gives the size (in bits) of each vlc code.

   'codes' : table which gives the bit pattern of of each vlc code.

   'symbols' : table which gives the values to be returned from get_vlc().

   'xxx_wrap' : give the number of bytes between each entry of the
   'bits' or 'codes' tables.

   'xxx_size' : gives the number of bytes of each entry of the 'bits'
   or 'codes' tables.

   'wrap' and 'size' allows to use any memory configuration and types
   (byte/word/long) to store the 'bits', 'codes', and 'symbols' tables.

   'use_static' should be set to 1 for tables, which should be freed
   with av_free_static(), 0 if free_vlc() will be used.
*/
int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
             const void *bits, int bits_wrap, int bits_size,
             const void *codes, int codes_wrap, int codes_size,
             const void *symbols, int symbols_wrap, int symbols_size,
             int flags)
{
    vlc->bits = nb_bits;
    if(flags & INIT_VLC_USE_NEW_STATIC){
        if(vlc->table_size && vlc->table_size == vlc->table_allocated){
            return 0;
        }else if(vlc->table_size){
            return -1; // fatal error, we are called on a partially initialized table
        }
    }else if(!(flags & INIT_VLC_USE_STATIC)) {
        vlc->table = NULL;
        vlc->table_allocated = 0;
        vlc->table_size = 0;
    } else {
        /* Static tables are initially always NULL, return
           if vlc->table != NULL to avoid double allocation */
        if(vlc->table)
            return 0;
    }

#ifdef DEBUG_VLC
    DEBUGF("build table nb_codes=%d\n", nb_codes);
#endif

    if (build_table(vlc, nb_bits, nb_codes,
                    bits, bits_wrap, bits_size,
                    codes, codes_wrap, codes_size,
                    symbols, symbols_wrap, symbols_size,
                    0, 0, flags) < 0) {
        //free(&vlc->table);
        return -1;
    }
    /* Changed the following condition to be true if table_size > table_allocated. *
     * This would be more sensible for static tables since we want warnings for    *
     * memory shortages only.                                                      */
#ifdef TEST
    if((flags & INIT_VLC_USE_NEW_STATIC) && vlc->table_size > vlc->table_allocated)
        DEBUGF("needed %d had %d\n", vlc->table_size, vlc->table_allocated);
#endif
    return 0;
}