/* * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> * * 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 * Range decoder functions common to VP8 and VP9 */ #ifndef AVCODEC_VP89_RAC_H #define AVCODEC_VP89_RAC_H #include <stdint.h> #include "libavutil/attributes.h" #include "vpx_rac.h" // rounding is different than vpx_rac_get, is vpx_rac_get wrong? static av_always_inline int vp89_rac_get(VPXRangeCoder *c) { return vpx_rac_get_prob(c, 128); } static av_unused int vp89_rac_get_uint(VPXRangeCoder *c, int bits) { int value = 0; while (bits--) { value = (value << 1) | vp89_rac_get(c); } return value; } // how probabilities are associated with decisions is different I think // well, the new scheme fits in the old but this way has one fewer branches per decision static av_always_inline int vp89_rac_get_tree(VPXRangeCoder *c, const int8_t (*tree)[2], const uint8_t *probs) { int i = 0; do { i = tree[i][vpx_rac_get_prob(c, probs[i])]; } while (i > 0); return -i; } #endif /* AVCODEC_VP89_RAC_H */