aom_dsp/entcode.h

   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_