media/libaom/src/av1/encoder/random.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

/*
 * Copyright (c) 2017, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AOM_AV1_ENCODER_RANDOM_H_
#define AOM_AV1_ENCODER_RANDOM_H_

#ifdef __cplusplus
extern "C" {
#endif

// Generate a random number in the range [0, 32768).
static INLINE unsigned int lcg_rand16(unsigned int *state) {
  *state = (unsigned int)(*state * 1103515245ULL + 12345);
  return *state / 65536 % 32768;
}

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_AV1_ENCODER_RANDOM_H_