mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-25 08:42:39 +00:00
2408f92678
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2016 Open Broadcast Systems Ltd.
|
|
* Author 2016 Rostislav Pehlivanov <rpehlivanov@obe.tv>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_DIRAC_VLC_H
|
|
#define AVCODEC_DIRAC_VLC_H
|
|
|
|
#include "libavutil/avutil.h"
|
|
|
|
/* Can be 32 bits wide for some performance gain on some machines, but it will
|
|
* incorrectly decode very long coefficients (usually only 1 or 2 per frame) */
|
|
typedef uint64_t residual;
|
|
|
|
#define LUT_BITS 8
|
|
|
|
/* Exactly 64 bytes */
|
|
typedef struct DiracGolombLUT {
|
|
residual preamble, leftover;
|
|
int32_t ready[LUT_BITS];
|
|
int32_t preamble_bits, leftover_bits, ready_num;
|
|
int8_t need_s, sign;
|
|
} DiracGolombLUT;
|
|
|
|
av_cold int ff_dirac_golomb_reader_init(DiracGolombLUT **lut_ctx);
|
|
|
|
int ff_dirac_golomb_read_32bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
|
|
int bytes, uint8_t *dst, int coeffs);
|
|
|
|
int ff_dirac_golomb_read_16bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
|
|
int bytes, uint8_t *_dst, int coeffs);
|
|
|
|
av_cold void ff_dirac_golomb_reader_end(DiracGolombLUT **lut_ctx);
|
|
|
|
#endif /* AVCODEC_DIRAC_VLC_H */
|