47 строки
1.6 KiB
C
47 строки
1.6 KiB
C
/*
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* Copyright (c) 2001-2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#if !defined(_entcode_H)
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#define _entcode_H (1)
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#include <limits.h>
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#include <stddef.h>
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#include "av1/common/odintrin.h"
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/*OPT: od_ec_window must be at least 32 bits, but if you have fast arithmetic
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on a larger type, you can speed up the decoder by using it here.*/
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typedef uint32_t od_ec_window;
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#define OD_EC_WINDOW_SIZE ((int)sizeof(od_ec_window) * CHAR_BIT)
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/*The number of bits to use for the range-coded part of unsigned integers.*/
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#define OD_EC_UINT_BITS (4)
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/*The resolution of fractional-precision bit usage measurements, i.e.,
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3 => 1/8th bits.*/
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#define OD_BITRES (3)
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/*With CONFIG_EC_SMALLMUL, the value stored in a CDF is 32768 minus the actual
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Q15 cumulative probability (an "inverse" CDF).
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This function converts from one representation to the other (and is its own
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inverse).*/
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#if CONFIG_EC_SMALLMUL
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#define OD_ICDF(x) (32768U - (x))
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#else
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#define OD_ICDF(x) (x)
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#endif
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/*See entcode.c for further documentation.*/
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OD_WARN_UNUSED_RESULT uint32_t od_ec_tell_frac(uint32_t nbits_total,
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uint32_t rng);
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#endif
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