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
85
86
87
88
89
90
91
92
93
|
/*
* Copyright (C) 2003-2013 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_INPUT_PLUGIN_HXX
#define MPD_INPUT_PLUGIN_HXX
#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"
#include <stddef.h>
#include <stdint.h>
struct config_param;
struct input_stream;
class Error;
struct Tag;
struct InputPlugin {
typedef int64_t offset_type;
const char *name;
/**
* Global initialization. This method is called when MPD starts.
*
* @param error_r location to store the error occurring, or
* NULL to ignore errors
* @return true on success, false if the plugin should be
* disabled
*/
bool (*init)(const config_param ¶m, Error &error);
/**
* Global deinitialization. Called once before MPD shuts
* down (only if init() has returned true).
*/
void (*finish)(void);
struct input_stream *(*open)(const char *uri,
Mutex &mutex, Cond &cond,
Error &error);
void (*close)(struct input_stream *is);
/**
* Check for errors that may have occurred in the I/O thread.
* May be unimplemented for synchronous plugins.
*
* @return false on error
*/
bool (*check)(struct input_stream *is, Error &error);
/**
* Update the public attributes. Call before access. Can be
* NULL if the plugin always keeps its attributes up to date.
*/
void (*update)(struct input_stream *is);
Tag *(*tag)(struct input_stream *is);
/**
* Returns true if the next read operation will not block:
* either data is available, or end-of-stream has been
* reached, or an error has occurred.
*
* If this method is unimplemented, then it is assumed that
* reading will never block.
*/
bool (*available)(struct input_stream *is);
size_t (*read)(struct input_stream *is, void *ptr, size_t size,
Error &error);
bool (*eof)(struct input_stream *is);
bool (*seek)(struct input_stream *is, offset_type offset, int whence,
Error &error);
};
#endif
|
