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Diffstat (limited to 'libavcodec/dirac_vlc.h')
-rw-r--r-- | libavcodec/dirac_vlc.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libavcodec/dirac_vlc.h b/libavcodec/dirac_vlc.h new file mode 100644 index 0000000..42ae41b --- /dev/null +++ b/libavcodec/dirac_vlc.h @@ -0,0 +1,51 @@ +/* + * 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 */ |