зеркало из https://github.com/mozilla/gecko-dev.git
71 строка
3.1 KiB
C
71 строка
3.1 KiB
C
/*
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* Copyright (c) 2017, 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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#ifndef AOM_DSP_BINARY_CODES_WRITER_H_
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#define AOM_DSP_BINARY_CODES_WRITER_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <assert.h>
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#include "./aom_config.h"
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#include "aom/aom_integer.h"
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#include "aom_dsp/bitwriter.h"
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// Codes a symbol v in [-2^mag_bits, 2^mag_bits]
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// mag_bits is number of bits for magnitude. The alphabet is of size
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// 2 * 2^mag_bits + 1, symmetric around 0, where one bit is used to
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// indicate 0 or non-zero, mag_bits bits are used to indicate magnitide
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// and 1 more bit for the sign if non-zero.
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void aom_write_primitive_symmetric(aom_writer *w, int16_t v,
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unsigned int mag_bits);
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// Encodes a value v in [0, n-1] quasi-uniformly
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void aom_write_primitive_quniform(aom_writer *w, uint16_t n, uint16_t v);
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// Encodes a value v in [0, n-1] based on a reference ref also in [0, n-1]
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// The closest p values of v from ref are coded using a p-ary quasi-unoform
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// short code while the remaining n-p values are coded with a longer code.
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void aom_write_primitive_refbilevel(aom_writer *w, uint16_t n, uint16_t p,
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uint16_t ref, uint16_t v);
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// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k
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void aom_write_primitive_subexpfin(aom_writer *w, uint16_t n, uint16_t k,
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uint16_t v);
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// Finite subexponential code that codes a symbol v in [0, n-1] with parameter k
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// based on a reference ref also in [0, n-1].
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void aom_write_primitive_refsubexpfin(aom_writer *w, uint16_t n, uint16_t k,
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uint16_t ref, uint16_t v);
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// Finite subexponential code that codes a symbol v in [-(n-1), n-1] with
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// parameter k based on a reference ref also in [-(n-1), n-1].
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void aom_write_signed_primitive_refsubexpfin(aom_writer *w, uint16_t n,
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uint16_t k, int16_t ref,
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int16_t v);
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// Functions that counts bits for the above primitives
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int aom_count_primitive_symmetric(int16_t v, unsigned int mag_bits);
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int aom_count_primitive_quniform(uint16_t n, uint16_t v);
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int aom_count_primitive_refbilevel(uint16_t n, uint16_t p, uint16_t ref,
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uint16_t v);
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int aom_count_primitive_subexpfin(uint16_t n, uint16_t k, uint16_t v);
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int aom_count_primitive_refsubexpfin(uint16_t n, uint16_t k, uint16_t ref,
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uint16_t v);
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int aom_count_signed_primitive_refsubexpfin(uint16_t n, uint16_t k, int16_t ref,
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int16_t v);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // AOM_DSP_BINARY_CODES_WRITER_H_
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