Line data    Source code

       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_AV1_ENCODER_RANDOM_H_
      13             : #define AOM_AV1_ENCODER_RANDOM_H_
      14             : 
      15             : #ifdef __cplusplus
      16             : extern "C" {
      17             : #endif
      18             : 
      19             : // Generate a random number in the range [0, 32768).
      20        6780 : static INLINE unsigned int lcg_rand16(unsigned int *state) {
      21        6780 :   *state = (unsigned int)(*state * 1103515245ULL + 12345);
      22        6780 :   return *state / 65536 % 32768;
      23             : }
      24             : 
      25             : #ifdef __cplusplus
      26             : }  // extern "C"
      27             : #endif
      28             : 
      29             : #endif  // AOM_AV1_ENCODER_RANDOM_H_