236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/*****************************************************************************
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* vlc.c: VLC lookup table generation.
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*****************************************************************************
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* Copyright (C) 2003 Laurent Aimar
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* $Id: vlc.c,v 1.1 2004/06/03 19:27:07 fenrir Exp $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include "common/common.h"
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#include "common/vlc.h"
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#include "vlc.h"
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static int vlc_table_realloc( x264_vlc_table_t *table, int i_size )
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{
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int i_index;
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i_index = table->i_lookup;
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table->i_lookup += i_size;
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table->lookup = x264_realloc( table->lookup, sizeof( vlc_lookup_t ) * table->i_lookup );
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return( i_index );
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}
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static int vlc_table_create_part( x264_vlc_table_t *table, const vlc_t *vlc, int i_lookup_bits, int i_nb_vlc, int i_prefix_code, int i_prefix_length )
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{
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int i;
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int i_nb_lookup;
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vlc_lookup_t *lookup;
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int i_table_index;
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i_nb_lookup = 1 << i_lookup_bits;
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i_table_index = vlc_table_realloc( table, i_nb_lookup );
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lookup = &table->lookup[i_table_index];
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for( i = 0; i < i_nb_lookup; i++ )
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{
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lookup[i].i_value = -1;
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lookup[i].i_size = 0;
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}
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for( i = 0; i < i_nb_vlc; i++ )
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{
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int i_bits;
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if( vlc[i].i_size <= 0 )
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{
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continue;
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}
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i_bits = vlc[i].i_size - i_prefix_length;
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if( i_bits > 0 && ( vlc[i].i_bits >> i_bits ) == i_prefix_code )
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{
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if( i_bits <= i_lookup_bits )
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{
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int i_lookup_index;
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int nb;
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i_lookup_index = ( vlc[i].i_bits << ( i_lookup_bits - i_bits ) )%i_nb_lookup;
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nb = 1 << ( i_lookup_bits - i_bits );
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for( nb = 0; nb < (1 << ( i_lookup_bits - i_bits)); nb++ )
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{
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lookup[i_lookup_index].i_value = i; /* vlc[i].i_value; */
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lookup[i_lookup_index].i_size = i_bits;
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i_lookup_index++;
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}
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}
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else
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{
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int i_bits_max;
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int i_lookup_index;
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/* need another table */
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i_lookup_index = ( vlc[i].i_bits >> (i_bits - i_lookup_bits ) )%i_nb_lookup;
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i_bits_max = -lookup[i_lookup_index].i_size;
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if( i_bits_max < i_bits - i_lookup_bits )
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{
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i_bits_max = i_bits - i_lookup_bits;
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}
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lookup[i_lookup_index].i_size = -i_bits_max;
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}
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}
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}
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/* create other level table */
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for( i = 0; i < i_nb_lookup; i++ )
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{
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if( lookup[i].i_size < 0 )
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{
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int i_bits;
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int i_index;
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i_bits = -lookup[i].i_size;
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if( i_bits > i_lookup_bits )
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{
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lookup[i].i_size = -i_lookup_bits;
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i_bits = i_lookup_bits;
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}
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i_index = vlc_table_create_part( table, vlc, i_bits, i_nb_vlc,
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(i_prefix_code << i_lookup_bits)|i,
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i_lookup_bits+i_prefix_length );
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lookup = &table->lookup[i_table_index]; // reallocated
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lookup[i].i_value = i_index;
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}
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}
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return( i_table_index );
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}
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x264_vlc_table_t *x264_vlc_table_lookup_new( const vlc_t *vlc, int i_vlc, int i_lookup_bits )
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{
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x264_vlc_table_t *table = x264_malloc( sizeof( x264_vlc_table_t ) );
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table->i_lookup_bits = i_lookup_bits;
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table->i_lookup = 0;
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table->lookup = NULL;
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vlc_table_create_part( table, vlc, i_lookup_bits, i_vlc, 0, 0 );
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return table;
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}
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void x264_vlc_table_lookup_delete( x264_vlc_table_t *table )
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{
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x264_free( table->lookup );
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x264_free( table );
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}
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#if 0
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void x264_vlc_table_lookup_print( x264_vlc_table_t *table )
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{
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int idx;
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fprintf( stderr, " " );
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for( idx = 0; idx < table->i_lookup; idx++ )
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{
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if( table->lookup[idx].i_value == -1 )
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{
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fprintf( stderr, " MKVLCLU( -1, 0 )," );
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}
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else
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{
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fprintf( stderr, " MKVLCLU( 0x%.3x, % 2d ),", table->lookup[idx].i_value, table->lookup[idx].i_size );
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}
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if( (idx+1)%4 == 0 && idx < table->i_lookup - 1)
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{
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fprintf( stderr, "\n " );
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}
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}
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fprintf( stderr, "\n" );
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}
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int main(void)
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{
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int i;
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x264_vlc_table_t *table;
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printf( "typedef struct\n int i_value;\n int i_size;\n} vlc_lookup_t;\n\n#define MKVLCLU(a,b) { .i_value=a, .i_size=b}" );
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/* create vlc entry table and then vlc_lookup_t table */
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/* x264_coeff_token */
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fprintf( stderr, "static const vlc_lookup_t x264_coeff_token_lookup[5][]=\n{\n" );
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for( i = 0; i < 5; i++ )
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{
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fprintf( stderr, " {\n" );
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table = x264_vlc_table_lookup_new( x264_coeff_token[i], 17*4, 6 );
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x264_vlc_table_lookup_print( table );
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x264_vlc_table_lookup_delete( table );
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fprintf( stderr, " },\n" );
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}
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fprintf( stderr, "};\n" );
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#if 0
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vlce = convert_vlc_to_vlce( x264_level_prefix, 16 );
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do_vlc_table_create( vlce, 16, "x264_level_prefix_lookup", 8 );
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free( vlce );
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for( i_table = 0; i_table < 15; i_table++ )
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{
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char name[512];
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vlce = convert_vlc_to_vlce( x264_total_zeros[i_table], 16 );
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sprintf( name, "x264_total_zeros_%d", i_table );
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do_vlc_table_create( vlce, 16, name, 6 );
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free( vlce );
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}
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for( i_table = 0; i_table < 3; i_table++ )
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{
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char name[512];
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vlce = convert_vlc_to_vlce( x264_total_zeros_dc[i_table], 4 );
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sprintf( name, "x264_total_zeros_dc_%d", i_table );
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do_vlc_table_create( vlce, 4, name, 3 );
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free( vlce );
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}
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for( i_table = 0; i_table < 7; i_table++ )
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{
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char name[512];
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vlce = convert_vlc_to_vlce( x264_run_before[i_table], 15 );
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sprintf( name, "x264_run_before_%d", i_table );
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do_vlc_table_create( vlce, 15, name, 6 );
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free( vlce );
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}
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#endif
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return 0;
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}
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#endif
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