PeerStreamer

/*

 * Copyright (c) 2000-2002 Fabrice Bellard

 * Copyright (c) 2002-2004 Michael Niedermayer

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file libavcodec/rl.h

 * rl header.

 */

#ifndef AVCODEC_RL_H

#define AVCODEC_RL_H

#include <stdint.h>

#include "get_bits.h"

/* run length table */

#define MAX_RUN    64

#define MAX_LEVEL  64

/** RLTable. */

typedef struct RLTable {

    int n;                         ///< number of entries of table_vlc minus 1

    int last;                      ///< number of values for last = 0

    const uint16_t (*table_vlc)[2];

    const int8_t *table_run;

    const int8_t *table_level;

    uint8_t *index_run[2];         ///< encoding only

    int8_t *max_level[2];          ///< encoding & decoding

    int8_t *max_run[2];            ///< encoding & decoding

    VLC vlc;                       ///< decoding only deprecated FIXME remove

    RL_VLC_ELEM *rl_vlc[32];       ///< decoding only

} RLTable;

/**

 *

 * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold

 *                     the level and run tables, if this is NULL av_malloc() will be used

 */

void init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);

void init_vlc_rl(RLTable *rl);

#define INIT_VLC_RL(rl, static_size)\

{\

    int q;\

    static RL_VLC_ELEM rl_vlc_table[32][static_size];\

    INIT_VLC_STATIC(&rl.vlc, 9, rl.n + 1,\

             &rl.table_vlc[0][1], 4, 2,\

             &rl.table_vlc[0][0], 4, 2, static_size);\

\

    if(!rl.rl_vlc[0]){\

        for(q=0; q<32; q++)\

            rl.rl_vlc[q]= rl_vlc_table[q];\

\

        init_vlc_rl(&rl);\

    }\

}

static inline int get_rl_index(const RLTable *rl, int last, int run, int level)

{

    int index;

    index = rl->index_run[last][run];

    if (index >= rl->n)

        return rl->n;

    if (level > rl->max_level[last][run])

        return rl->n;

    return index + level - 1;

}

#endif /* AVCODEC_RL_H */