entcode.h (1418B)
1 /* 2 * Copyright (c) 2001-2016, 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_ENTCODE_H_ 13 #define AOM_AOM_DSP_ENTCODE_H_ 14 15 #include <limits.h> 16 #include <stddef.h> 17 #include "aom_dsp/odintrin.h" 18 #include "aom_dsp/prob.h" 19 20 #define EC_PROB_SHIFT 6 21 #define EC_MIN_PROB 4 // must be <= (1<<EC_PROB_SHIFT)/16 22 23 /*OPT: od_ec_window must be at least 32 bits, but if you have fast arithmetic 24 on a larger type, you can speed up the decoder by using it here.*/ 25 typedef uint32_t od_ec_window; 26 27 /*The size in bits of od_ec_window.*/ 28 #define OD_EC_WINDOW_SIZE ((int)sizeof(od_ec_window) * CHAR_BIT) 29 30 /*The resolution of fractional-precision bit usage measurements, i.e., 31 3 => 1/8th bits.*/ 32 #define OD_BITRES (3) 33 34 #define OD_ICDF AOM_ICDF 35 36 /*See entcode.c for further documentation.*/ 37 38 OD_WARN_UNUSED_RESULT uint32_t od_ec_tell_frac(uint32_t nbits_total, 39 uint32_t rng); 40 41 #endif // AOM_AOM_DSP_ENTCODE_H_