1 /* 2 =============================================================================== 3 4 FILE: field_nir14.hpp 5 6 CONTENTS: 7 8 9 PROGRAMMERS: 10 11 martin.isenburg@rapidlasso.com - http://rapidlasso.com 12 uday.karan@gmail.com - Hobu, Inc. 13 14 COPYRIGHT: 15 16 (c) 2007-2014, martin isenburg, rapidlasso - tools to catch reality 17 (c) 2014, Uday Verma, Hobu, Inc. 18 19 This is free software; you can redistribute and/or modify it under the 20 terms of the GNU Lesser General Licence as published by the Free Software 21 Foundation. See the COPYING file for more information. 22 23 This software is distributed WITHOUT ANY WARRANTY and without even the 24 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 25 26 CHANGE HISTORY: 27 28 =============================================================================== 29 */ 30 31 namespace lazperf 32 { 33 namespace detail 34 { 35 36 class Nir14Base 37 { 38 protected: 39 struct ChannelCtx 40 { 41 int have_last_; 42 las::nir14 last_; 43 models::arithmetic used_model_; 44 std::array<models::arithmetic, 2> diff_model_; 45 ChannelCtxlazperf::detail::Nir14Base::ChannelCtx46 ChannelCtx() : have_last_{false}, used_model_(4), 47 diff_model_{ models::arithmetic(256), models::arithmetic(256) } 48 {} 49 }; 50 51 std::array<ChannelCtx, 4> chan_ctxs_; 52 int last_channel_ = -1; 53 }; 54 55 class Nir14Compressor : public Nir14Base 56 { 57 public: Nir14Compressor(OutCbStream & stream)58 Nir14Compressor(OutCbStream& stream) : stream_(stream), nir_enc_(false) 59 {} 60 61 void writeSizes(); 62 void writeData(); 63 const char *compress(const char *buf, int& sc); 64 65 private: 66 OutCbStream& stream_; 67 encoders::arithmetic<MemoryStream> nir_enc_; 68 }; 69 70 class Nir14Decompressor : public Nir14Base 71 { 72 public: Nir14Decompressor(InCbStream & stream)73 Nir14Decompressor(InCbStream& stream) : stream_(stream) 74 {} 75 76 void dumpSums(); 77 void readSizes(); 78 void readData(); 79 char *decompress(char *buf, int& sc); 80 81 private: 82 InCbStream& stream_; 83 uint32_t nir_cnt_; 84 decoders::arithmetic<MemoryStream> nir_dec_; 85 utils::Summer sumNir; 86 }; 87 88 } // namespace detail 89 } // namespace lazperf 90