1 /* 2 * Copyright (c) 2017, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AOM_DSP_BINARY_CODES_WRITER_H_ 13 #define AOM_AOM_DSP_BINARY_CODES_WRITER_H_ 14 15 #ifdef __cplusplus 16 extern "C" { 17 #endif 18 19 #include <assert.h> 20 #include "config/aom_config.h" 21 22 #include "aom/aom_integer.h" 23 #include "aom_dsp/bitwriter.h" 24 #include "aom_dsp/bitwriter_buffer.h" 25 26 // Codes a symbol v in [-2^mag_bits, 2^mag_bits] 27 // mag_bits is number of bits for magnitude. The alphabet is of size 28 // 2 * 2^mag_bits + 1, symmetric around 0, where one bit is used to 29 // indicate 0 or non-zero, mag_bits bits are used to indicate magnitide 30 // and 1 more bit for the sign if non-zero. 31 void aom_write_primitive_symmetric(aom_writer *w, int16_t v, 32 unsigned int mag_bits); 33 34 // Encodes a value v in [0, n-1] quasi-uniformly 35 void aom_write_primitive_quniform(aom_writer *w, uint16_t n, uint16_t v); 36 37 // Finite subexponential code that codes a symbol v in [0, n-1] with parameter k 38 void aom_write_primitive_subexpfin(aom_writer *w, uint16_t n, uint16_t k, 39 uint16_t v); 40 41 // Finite subexponential code that codes a symbol v in [0, n-1] with parameter k 42 // based on a reference ref also in [0, n-1]. 43 void aom_write_primitive_refsubexpfin(aom_writer *w, uint16_t n, uint16_t k, 44 uint16_t ref, uint16_t v); 45 46 // Finite subexponential code that codes a symbol v in [-(n-1), n-1] with 47 // parameter k based on a reference ref also in [-(n-1), n-1]. 48 void aom_write_signed_primitive_refsubexpfin(aom_writer *w, uint16_t n, 49 uint16_t k, int16_t ref, 50 int16_t v); 51 52 // Functions that counts bits for the above primitives 53 int aom_count_primitive_symmetric(int16_t v, unsigned int mag_bits); 54 int aom_count_primitive_quniform(uint16_t n, uint16_t v); 55 int aom_count_primitive_subexpfin(uint16_t n, uint16_t k, uint16_t v); 56 int aom_count_primitive_refsubexpfin(uint16_t n, uint16_t k, uint16_t ref, 57 uint16_t v); 58 int aom_count_signed_primitive_refsubexpfin(uint16_t n, uint16_t k, int16_t ref, 59 int16_t v); 60 61 #ifdef __cplusplus 62 } // extern "C" 63 #endif 64 65 #endif // AOM_AOM_DSP_BINARY_CODES_WRITER_H_ 66