MPD
pcm_utils.h
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1 /*
2  * Copyright (C) 2003-2010 The Music Player Daemon Project
3  * http://www.musicpd.org
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #ifndef MPD_PCM_UTILS_H
21 #define MPD_PCM_UTILS_H
22 
23 #include <glib.h>
24 
25 #include <stdint.h>
26 
31 static inline int32_t
32 pcm_range(int32_t sample, unsigned bits)
33 {
34  if (G_UNLIKELY(sample < (-1 << (bits - 1))))
35  return -1 << (bits - 1);
36  if (G_UNLIKELY(sample >= (1 << (bits - 1))))
37  return (1 << (bits - 1)) - 1;
38  return sample;
39 }
40 
45 static inline int64_t
46 pcm_range_64(int64_t sample, unsigned bits)
47 {
48  if (G_UNLIKELY(sample < ((int64_t)-1 << (bits - 1))))
49  return (int64_t)-1 << (bits - 1);
50  if (G_UNLIKELY(sample >= ((int64_t)1 << (bits - 1))))
51  return ((int64_t)1 << (bits - 1)) - 1;
52  return sample;
53 }
54 
55 #endif