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/*
* 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>
#include "common/intops.h"
typedef size_t ec_win;
typedef struct MsacContext {
const uint8_t *buf_pos;
const uint8_t *buf_end;
ec_win dif;
unsigned rng;
int cnt;
int allow_update_cdf;
#if ARCH_X86_64 && HAVE_ASM
unsigned (*symbol_adapt16)(struct MsacContext *s, uint16_t *cdf, size_t n_symbols);
#endif
} MsacContext;
#if HAVE_ASM
#if ARCH_AARCH64 || ARCH_ARM
#include "src/arm/msac.h"
#elif ARCH_X86
#include "src/x86/msac.h"
#endif
#endif
void dav1d_msac_init(MsacContext *s, const uint8_t *data, size_t sz,
int disable_cdf_update_flag);
unsigned dav1d_msac_decode_symbol_adapt_c(MsacContext *s, uint16_t *cdf,
size_t n_symbols);
unsigned dav1d_msac_decode_bool_adapt_c(MsacContext *s, uint16_t *cdf);
unsigned dav1d_msac_decode_bool_equi_c(MsacContext *s);
unsigned dav1d_msac_decode_bool_c(MsacContext *s, unsigned f);
unsigned dav1d_msac_decode_hi_tok_c(MsacContext *s, uint16_t *cdf);
int dav1d_msac_decode_subexp(MsacContext *s, int ref, int n, unsigned k);
/* Supported n_symbols ranges: adapt4: 1-4, adapt8: 1-7, adapt16: 3-15 */
#ifndef dav1d_msac_decode_symbol_adapt4
#define dav1d_msac_decode_symbol_adapt4 dav1d_msac_decode_symbol_adapt_c
#endif
#ifndef dav1d_msac_decode_symbol_adapt8
#define dav1d_msac_decode_symbol_adapt8 dav1d_msac_decode_symbol_adapt_c
#endif
#ifndef dav1d_msac_decode_symbol_adapt16
#define dav1d_msac_decode_symbol_adapt16 dav1d_msac_decode_symbol_adapt_c
#endif
#ifndef dav1d_msac_decode_bool_adapt
#define dav1d_msac_decode_bool_adapt dav1d_msac_decode_bool_adapt_c
#endif
#ifndef dav1d_msac_decode_bool_equi
#define dav1d_msac_decode_bool_equi dav1d_msac_decode_bool_equi_c
#endif
#ifndef dav1d_msac_decode_bool
#define dav1d_msac_decode_bool dav1d_msac_decode_bool_c
#endif
#ifndef dav1d_msac_decode_hi_tok
#define dav1d_msac_decode_hi_tok dav1d_msac_decode_hi_tok_c
#endif
static inline unsigned dav1d_msac_decode_bools(MsacContext *const s, unsigned n) {
unsigned v = 0;
while (n--)
v = (v << 1) | dav1d_msac_decode_bool_equi(s);
return v;
}
static inline int dav1d_msac_decode_uniform(MsacContext *const s, const unsigned n) {
assert(n > 0);
const int l = ulog2(n) + 1;
assert(l > 1);
const unsigned m = (1 << l) - n;
const unsigned v = dav1d_msac_decode_bools(s, l - 1);
return v < m ? v : (v << 1) - m + dav1d_msac_decode_bool_equi(s);
}
#endif /* DAV1D_SRC_MSAC_H */
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