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ShiftConvert.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_SHIFT_CONVERT_HXX
21 #define MPD_PCM_SHIFT_CONVERT_HXX
22
23 #include "Traits.hxx"
24
29 template<SampleFormat SF, SampleFormat DF,
30 class ST=SampleTraits<SF>,
31 class DT=SampleTraits<DF>>
32 struct LeftShiftSampleConvert {
33 typedef ST SrcTraits;
34 typedef DT DstTraits;
35
36 typedef typename SrcTraits::value_type SV;
37 typedef typename DstTraits::value_type DV;
38
39 static_assert(SrcTraits::BITS < DstTraits::BITS,
40 "Source format must be smaller than destination format");
41
42 constexpr static DV Convert(SV src) {
43 return DV(src) << (DstTraits::BITS - SrcTraits::BITS);
44 }
45 };
46
51 template<SampleFormat SF, SampleFormat DF,
52 class ST=SampleTraits<SF>,
53 class DT=SampleTraits<DF>>
54 struct RightShiftSampleConvert {
55 typedef ST SrcTraits;
56 typedef DT DstTraits;
57
58 typedef typename SrcTraits::value_type SV;
59 typedef typename DstTraits::value_type DV;
60
61 static_assert(SrcTraits::BITS > DstTraits::BITS,
62 "Source format must be smaller than destination format");
63
64 constexpr static DV Convert(SV src) {
65 return src >> (SrcTraits::BITS - DstTraits::BITS);
66 }
67 };
68
69 #endif
RightShiftSampleConvert::DstTraits
DT DstTraits
Definition: ShiftConvert.hxx:56
SampleTraits
This template describes the specified SampleFormat.
Definition: PcmUtils.hxx:30
RightShiftSampleConvert::DV
DstTraits::value_type DV
Definition: ShiftConvert.hxx:59
RightShiftSampleConvert
Convert from one integer sample format to another by shifting bits to the right.
Definition: ShiftConvert.hxx:54
LeftShiftSampleConvert::DstTraits
DT DstTraits
Definition: ShiftConvert.hxx:34
Traits.hxx
RightShiftSampleConvert::Convert
static constexpr DV Convert(SV src)
Definition: ShiftConvert.hxx:64
LeftShiftSampleConvert
Convert from one integer sample format to another by shifting bits to the left.
Definition: ShiftConvert.hxx:32
SampleFormat
SampleFormat
Definition: SampleFormat.hxx:33
RightShiftSampleConvert::SrcTraits
ST SrcTraits
Definition: ShiftConvert.hxx:55
LeftShiftSampleConvert::Convert
static constexpr DV Convert(SV src)
Definition: ShiftConvert.hxx:42
RightShiftSampleConvert::SV
SrcTraits::value_type SV
Definition: ShiftConvert.hxx:58
LeftShiftSampleConvert::SrcTraits
ST SrcTraits
Definition: ShiftConvert.hxx:33
LeftShiftSampleConvert::DV
DstTraits::value_type DV
Definition: ShiftConvert.hxx:37
LeftShiftSampleConvert::SV
SrcTraits::value_type SV
Definition: ShiftConvert.hxx:36