michael@0: /* Copyright (c) 2001-2008 Timothy B. Terriberry
michael@0:    Copyright (c) 2008-2009 Xiph.Org Foundation */
michael@0: /*
michael@0:    Redistribution and use in source and binary forms, with or without
michael@0:    modification, are permitted provided that the following conditions
michael@0:    are met:
michael@0: 
michael@0:    - Redistributions of source code must retain the above copyright
michael@0:    notice, this list of conditions and the following disclaimer.
michael@0: 
michael@0:    - Redistributions in binary form must reproduce the above copyright
michael@0:    notice, this list of conditions and the following disclaimer in the
michael@0:    documentation and/or other materials provided with the distribution.
michael@0: 
michael@0:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
michael@0:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
michael@0:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
michael@0:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
michael@0:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
michael@0:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
michael@0:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
michael@0:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: */
michael@0: 
michael@0: #if !defined(_mfrngcode_H)
michael@0: # define _mfrngcode_H (1)
michael@0: # include "entcode.h"
michael@0: 
michael@0: /*Constants used by the entropy encoder/decoder.*/
michael@0: 
michael@0: /*The number of bits to output at a time.*/
michael@0: # define EC_SYM_BITS   (8)
michael@0: /*The total number of bits in each of the state registers.*/
michael@0: # define EC_CODE_BITS  (32)
michael@0: /*The maximum symbol value.*/
michael@0: # define EC_SYM_MAX    ((1U<<EC_SYM_BITS)-1)
michael@0: /*Bits to shift by to move a symbol into the high-order position.*/
michael@0: # define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1)
michael@0: /*Carry bit of the high-order range symbol.*/
michael@0: # define EC_CODE_TOP   (((opus_uint32)1U)<<(EC_CODE_BITS-1))
michael@0: /*Low-order bit of the high-order range symbol.*/
michael@0: # define EC_CODE_BOT   (EC_CODE_TOP>>EC_SYM_BITS)
michael@0: /*The number of bits available for the last, partial symbol in the code field.*/
michael@0: # define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1)
michael@0: #endif