| /* |
| * 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 */ |