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PcmUtils.hxx
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1 /*
2 * Copyright 2003-2017 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 "Compiler.h"
24
25 #include <limits>
26
27 #include <stdint.h>
28
29 enum class SampleFormat : uint8_t;
30 template<SampleFormat F> struct SampleTraits;
31
36 template<SampleFormat F, class Traits=SampleTraits<F>>
37 gcc_const
38 static inline typename Traits::value_type
39 PcmClamp(typename Traits::long_type x)
40 {
41 typedef typename Traits::value_type T;
42
43 typedef std::numeric_limits<T> limits;
44 static_assert(Traits::MIN >= limits::min(), "out of range");
45 static_assert(Traits::MAX <= limits::max(), "out of range");
46
47 if (gcc_unlikely(x < Traits::MIN))
48 return T(Traits::MIN);
49
50 if (gcc_unlikely(x > Traits::MAX))
51 return T(Traits::MAX);
52
53 return T(x);
54 }
55
56 #endif
SampleTraits
This template describes the specified SampleFormat.
Definition: PcmUtils.hxx:30
PcmClamp
static gcc_const Traits::value_type PcmClamp(typename Traits::long_type x)
Check if the value is within the range of the provided bit size, and caps it if necessary.
Definition: PcmUtils.hxx:39
gcc_unlikely
#define gcc_unlikely(x)
Definition: Compiler.h:125
Compiler.h
gcc_const
#define gcc_const
Definition: Compiler.h:109
SampleFormat
SampleFormat
Definition: SampleFormat.hxx:33