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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_PCM_FORMAT_CONVERTER_HXX
#define MPD_PCM_FORMAT_CONVERTER_HXX
#include "check.h"
#include "AudioFormat.hxx"
#include "PcmBuffer.hxx"
#include "PcmDither.hxx"
#ifndef NDEBUG
#include <assert.h>
#endif
class Error;
template<typename T> struct ConstBuffer;
/**
* A class that converts samples from one format to another.
*/
class PcmFormatConverter {
SampleFormat src_format, dest_format;
PcmBuffer buffer;
PcmDither dither;
public:
#ifndef NDEBUG
PcmFormatConverter()
:src_format(SampleFormat::UNDEFINED),
dest_format(SampleFormat::UNDEFINED) {}
~PcmFormatConverter() {
assert(src_format == SampleFormat::UNDEFINED);
assert(dest_format == SampleFormat::UNDEFINED);
}
#endif
/**
* Opens the object, prepare for Convert().
*
* @param src_format the sample format of incoming data
* @param dest_format the sample format of outgoing data
* @param error location to store the error
* @return true on success
*/
bool Open(SampleFormat src_format, SampleFormat dest_format,
Error &error);
/**
* Closes the object. After that, you may call Open() again.
*/
void Close();
/**
* Convert a block of PCM data.
*
* @param src the input buffer
* @param error location to store the error
* @return the destination buffer on success,
* ConstBuffer::Null() on error
*/
gcc_pure
ConstBuffer<void> Convert(ConstBuffer<void> src, Error &error);
};
#endif
|
