chromium/third_party/ffmpeg/libavcodec/golomb.h

/*
 * exp golomb vlc stuff
 * Copyright (c) 2003 Michael Niedermayer <[email protected]>
 * Copyright (c) 2004 Alex Beregszaszi
 *
 * 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
 * @brief
 *     exp golomb vlc stuff
 * @author Michael Niedermayer <[email protected]> and Alex Beregszaszi
 */

#ifndef AVCODEC_GOLOMB_H
#define AVCODEC_GOLOMB_H

#include <stdint.h>

#include "get_bits.h"

#define INVALID_VLC …

extern const uint8_t ff_golomb_vlc_len[512];
extern const uint8_t ff_ue_golomb_vlc_code[512];
extern const  int8_t ff_se_golomb_vlc_code[512];

extern const uint8_t ff_interleaved_golomb_vlc_len[256];
extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256];
extern const  int8_t ff_interleaved_se_golomb_vlc_code[256];
extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256];

/**
 * Read an unsigned Exp-Golomb code in the range 0 to 8190.
 *
 * @returns the read value or a negative error code.
 */
static inline int get_ue_golomb(GetBitContext *gb)
{ … }

/**
 * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1.
 */
static inline unsigned get_ue_golomb_long(GetBitContext *gb)
{ … }

/**
 * read unsigned exp golomb code, constraint to a max of 31.
 * If the value encountered is not in 0..31, the return value
 * is outside the range 0..30.
 */
static inline int get_ue_golomb_31(GetBitContext *gb)
{ … }

static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb)
{ … }

/**
 * read unsigned truncated exp golomb code.
 */
static inline int get_te0_golomb(GetBitContext *gb, int range)
{ … }

/**
 * read unsigned truncated exp golomb code.
 */
static inline int get_te_golomb(GetBitContext *gb, int range)
{ … }

/**
 * read signed exp golomb code.
 */
static inline int get_se_golomb(GetBitContext *gb)
{ … }

static inline int get_se_golomb_long(GetBitContext *gb)
{ … }

static inline int get_interleaved_se_golomb(GetBitContext *gb)
{ … }

static inline int dirac_get_se_golomb(GetBitContext *gb)
{ … }

/**
 * read unsigned golomb rice code (ffv1).
 */
static inline int get_ur_golomb(GetBitContext *gb, int k, int limit,
                                int esc_len)
{ … }

/**
 * read unsigned golomb rice code (jpegls).
 */
static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit,
                                       int esc_len)
{ … }

/**
 * read signed golomb rice code (ffv1).
 */
static inline int get_sr_golomb(GetBitContext *gb, int k, int limit,
                                int esc_len)
{ … }

/**
 * read signed golomb rice code (flac).
 */
static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit,
                                     int esc_len)
{ … }

/**
 * read unsigned golomb rice code (shorten).
 */
static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
{ … }

/**
 * read signed golomb rice code (shorten).
 */
static inline int get_sr_golomb_shorten(GetBitContext *gb, int k)
{ … }

#ifdef TRACE

static inline int get_ue(GetBitContext *s, const char *file, const char *func,
                         int line)
{
    int show = show_bits(s, 24);
    int pos  = get_bits_count(s);
    int i    = get_ue_golomb(s);
    int len  = get_bits_count(s) - pos;
    int bits = show >> (24 - len);

    av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue  @%5d in %s %s:%d\n",
           bits, len, i, pos, file, func, line);

    return i;
}

static inline int get_se(GetBitContext *s, const char *file, const char *func,
                         int line)
{
    int show = show_bits(s, 24);
    int pos  = get_bits_count(s);
    int i    = get_se_golomb(s);
    int len  = get_bits_count(s) - pos;
    int bits = show >> (24 - len);

    av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se  @%5d in %s %s:%d\n",
           bits, len, i, pos, file, func, line);

    return i;
}

static inline int get_te(GetBitContext *s, int r, char *file, const char *func,
                         int line)
{
    int show = show_bits(s, 24);
    int pos  = get_bits_count(s);
    int i    = get_te0_golomb(s, r);
    int len  = get_bits_count(s) - pos;
    int bits = show >> (24 - len);

    av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te  @%5d in %s %s:%d\n",
           bits, len, i, pos, file, func, line);

    return i;
}

#define get_ue_golomb …
#define get_se_golomb …
#define get_te_golomb …
#define get_te0_golomb …

#endif /* TRACE */
#endif /* AVCODEC_GOLOMB_H */