ref: ad4d1c4383b7705157807f2c364fca3ee3d713ef
dir: /src/msac.h/
/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef __DAV1D_SRC_MSAC_H__ #define __DAV1D_SRC_MSAC_H__ #include <stdint.h> #include <stdlib.h> /* Using uint32_t should be faster on 32 bit systems, in theory, maybe */ typedef uint64_t ec_win; typedef struct MsacContext { const uint8_t *buf_pos; const uint8_t *buf_end; ec_win dif; uint16_t rng; int cnt; int allow_update_cdf; } MsacContext; void msac_init(MsacContext *c, const uint8_t *data, size_t sz, int disable_cdf_update_flag); unsigned msac_decode_symbol(MsacContext *s, const uint16_t *cdf, const unsigned n_symbols); unsigned msac_decode_symbol_adapt(MsacContext *s, uint16_t *cdf, const unsigned n_symbols); unsigned msac_decode_bool_equi(MsacContext *const s); unsigned msac_decode_bool(MsacContext *s, unsigned f); unsigned msac_decode_bool_adapt(MsacContext *s, uint16_t *cdf); unsigned msac_decode_bools(MsacContext *c, unsigned l); int msac_decode_subexp(MsacContext *c, int ref, int n, unsigned k); int msac_decode_uniform(MsacContext *c, unsigned n); #endif /* __DAV1D_SRC_MSAC_H__ */