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41 lines
1.6 KiB
Objective-C
41 lines
1.6 KiB
Objective-C
/*
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* CarrylessRangeCoder.h
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#import "CSInputBuffer.h"
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typedef struct CarrylessRangeCoder
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{
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CSInputBuffer *input;
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uint32_t low,code,range,bottom;
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BOOL uselow;
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} CarrylessRangeCoder;
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void InitializeRangeCoder(CarrylessRangeCoder *self,CSInputBuffer *input,BOOL uselow,int bottom);
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uint32_t RangeCoderCurrentCount(CarrylessRangeCoder *self,uint32_t scale);
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void RemoveRangeCoderSubRange(CarrylessRangeCoder *self,uint32_t lowcount,uint32_t highcount);
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int NextSymbolFromRangeCoder(CarrylessRangeCoder *self,uint32_t *freqtable,int numfreq);
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int NextBitFromRangeCoder(CarrylessRangeCoder *self);
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int NextWeightedBitFromRangeCoder(CarrylessRangeCoder *self,int weight,int size);
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int NextWeightedBitFromRangeCoder2(CarrylessRangeCoder *self,int weight,int shift);
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void NormalizeRangeCoder(CarrylessRangeCoder *self);
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