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Diffstat (limited to 'ml/dlib/dlib/entropy_decoder/entropy_decoder_kernel_2.h')
| -rw-r--r-- | ml/dlib/dlib/entropy_decoder/entropy_decoder_kernel_2.h | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/ml/dlib/dlib/entropy_decoder/entropy_decoder_kernel_2.h b/ml/dlib/dlib/entropy_decoder/entropy_decoder_kernel_2.h deleted file mode 100644 index 7284cec3c..000000000 --- a/ml/dlib/dlib/entropy_decoder/entropy_decoder_kernel_2.h +++ /dev/null @@ -1,127 +0,0 @@ -// Copyright (C) 2004 Davis E. King (davis@dlib.net) -// License: Boost Software License See LICENSE.txt for the full license. -#ifndef DLIB_ENTROPY_DECODER_KERNEl_2_ -#define DLIB_ENTROPY_DECODER_KERNEl_2_ - -#include "../algs.h" -#include "entropy_decoder_kernel_abstract.h" -#include <iosfwd> -#include "../uintn.h" - -namespace dlib -{ - - class entropy_decoder_kernel_2 - { - /*! - GENERAL NOTES - this decoder is implemented using "range" coding - - INITIAL VALUE - in == 0 - initial_low == 0x00000001 (slightly more than zero) - initial_high == 0xffffffff (slightly less than one, 0.99999999976717) - target == 0x00000000 (zero) - low == initial_low - high == initial_high - r == 0 - - CONVENTION - if (in != 0) - *in == get_stream() - true == stream_is_set() - streambuf == in->rdbuf() - else - false == stream_is_set() - - - low == the low end of the range used for arithmetic encoding. - this number is used as a 32bit fixed point real number. - the point is fixed just before the first bit, so it is - always in the range [0,1) - - low is also never allowed to be zero to avoid overflow - in the calculation (high-low+1)/total. - - high == the high end of the range - 1 used for arithmetic encoding. - this number is used as a 32bit fixed point real number. - the point is fixed just before the first bit, so when we - interpret high as a real number then it is always in the - range [0,1) - - the range for arithmetic encoding is always - [low,high + 0.9999999...) the 0.9999999... is why - high == real upper range - 1 - - target == 32 bits of the fraction produced from an arithmetic encoder. - this number is used as a 32bit fixed point real number. - the point is fixed just before the first bit, so it is - always in the range [0,1) - - r == the value (high-low+1)/total from the last call to - get_target() or 0 if get_target_called() should be false - - get_target_called() == (r != 0) - - !*/ - - public: - - entropy_decoder_kernel_2 ( - ); - - virtual ~entropy_decoder_kernel_2 ( - ); - - void clear( - ); - - void set_stream ( - std::istream& in - ); - - bool stream_is_set ( - ) const; - - std::istream& get_stream ( - ) const; - - void decode ( - uint32 low_count, - uint32 high_count - ); - - bool get_target_called ( - ) const; - - uint32 get_target ( - uint32 total - ); - - private: - - // restricted functions - entropy_decoder_kernel_2(entropy_decoder_kernel_2&); // copy constructor - entropy_decoder_kernel_2& operator=(entropy_decoder_kernel_2&); // assignment operator - - // data members - const uint32 initial_low; - const uint32 initial_high; - std::istream* in; - uint32 low; - uint32 high; - uint32 target; - uint32 r; - std::streambuf* streambuf; - - }; - - -} - -#ifdef NO_MAKEFILE -#include "entropy_decoder_kernel_2.cpp" -#endif - -#endif // DLIB_ENTROPY_DECODER_KERNEl_2_ - |