cannam@154: /* Copyright (c) 2001-2008 Timothy B. Terriberry
cannam@154:    Copyright (c) 2008-2009 Xiph.Org Foundation */
cannam@154: /*
cannam@154:    Redistribution and use in source and binary forms, with or without
cannam@154:    modification, are permitted provided that the following conditions
cannam@154:    are met:
cannam@154: 
cannam@154:    - Redistributions of source code must retain the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer.
cannam@154: 
cannam@154:    - Redistributions in binary form must reproduce the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer in the
cannam@154:    documentation and/or other materials provided with the distribution.
cannam@154: 
cannam@154:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
cannam@154:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
cannam@154:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
cannam@154:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
cannam@154:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
cannam@154:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
cannam@154:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
cannam@154:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
cannam@154:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
cannam@154:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
cannam@154:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
cannam@154: */
cannam@154: 
cannam@154: #if !defined(_mfrngcode_H)
cannam@154: # define _mfrngcode_H (1)
cannam@154: # include "entcode.h"
cannam@154: 
cannam@154: /*Constants used by the entropy encoder/decoder.*/
cannam@154: 
cannam@154: /*The number of bits to output at a time.*/
cannam@154: # define EC_SYM_BITS   (8)
cannam@154: /*The total number of bits in each of the state registers.*/
cannam@154: # define EC_CODE_BITS  (32)
cannam@154: /*The maximum symbol value.*/
cannam@154: # define EC_SYM_MAX    ((1U<<EC_SYM_BITS)-1)
cannam@154: /*Bits to shift by to move a symbol into the high-order position.*/
cannam@154: # define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1)
cannam@154: /*Carry bit of the high-order range symbol.*/
cannam@154: # define EC_CODE_TOP   (((opus_uint32)1U)<<(EC_CODE_BITS-1))
cannam@154: /*Low-order bit of the high-order range symbol.*/
cannam@154: # define EC_CODE_BOT   (EC_CODE_TOP>>EC_SYM_BITS)
cannam@154: /*The number of bits available for the last, partial symbol in the code field.*/
cannam@154: # define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1)
cannam@154: #endif