зеркало из https://github.com/mozilla/gecko-dev.git
58 строки
2.5 KiB
C
58 строки
2.5 KiB
C
/* Copyright (c) 2001-2012 IETF Trust, Timothy B. Terriberry,
|
|
Xiph.Org Foundation. All rights reserved.*/
|
|
/*
|
|
|
|
This file is extracted from RFC6716. Please see that RFC for additional
|
|
information.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
- 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.
|
|
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
|
|
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.
|
|
*/
|
|
|
|
#if !defined(_mfrngcode_H)
|
|
# define _mfrngcode_H (1)
|
|
# include "entcode.h"
|
|
|
|
/*Constants used by the entropy encoder/decoder.*/
|
|
|
|
/*The number of bits to output at a time.*/
|
|
# define EC_SYM_BITS (8)
|
|
/*The total number of bits in each of the state registers.*/
|
|
# define EC_CODE_BITS (32)
|
|
/*The maximum symbol value.*/
|
|
# define EC_SYM_MAX ((1U<<EC_SYM_BITS)-1)
|
|
/*Bits to shift by to move a symbol into the high-order position.*/
|
|
# define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1)
|
|
/*Carry bit of the high-order range symbol.*/
|
|
# define EC_CODE_TOP (((opus_uint32)1U)<<(EC_CODE_BITS-1))
|
|
/*Low-order bit of the high-order range symbol.*/
|
|
# define EC_CODE_BOT (EC_CODE_TOP>>EC_SYM_BITS)
|
|
/*The number of bits available for the last, partial symbol in the code field.*/
|
|
# define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1)
|
|
#endif
|