/* * 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 */