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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Copyright (C) 2003-2009 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MPD_DECODER_PLUGIN_H
#define MPD_DECODER_PLUGIN_H
#include <stdbool.h>
#include <stddef.h>
struct config_param;
struct input_stream;
struct tag;
/**
* Opaque handle which the decoder plugin passes to the functions in
* this header.
*/
struct decoder;
struct decoder_plugin {
const char *name;
/**
* optional, set this to NULL if the InputPlugin doesn't
* have/need one this must return < 0 if there is an error and
* >= 0 otherwise
*/
bool (*init)(const struct config_param *param);
/**
* optional, set this to NULL if the InputPlugin doesn't have/need one
*/
void (*finish)(void);
/**
* this will be used to decode InputStreams, and is
* recommended for files and networked (HTTP) connections.
*
* @return false if the plugin cannot decode the stream, and
* true if it was able to do so (even if an error occured
* during playback)
*/
void (*stream_decode)(struct decoder *, struct input_stream *);
/**
* use this if and only if your InputPlugin can only be passed
* a filename or handle as input, and will not allow callbacks
* to be set (like Ogg-Vorbis and FLAC libraries allow)
*
* @return false if the plugin cannot decode the file, and
* true if it was able to do so (even if an error occured
* during playback)
*/
void (*file_decode)(struct decoder *, const char *path);
/**
* file should be the full path! Returns NULL if a tag cannot
* be found or read
*/
struct tag *(*tag_dup)(const char *file);
/* last element in these arrays must always be a NULL: */
const char *const*suffixes;
const char *const*mime_types;
};
/**
* Initialize a decoder plugin.
*
* @param param a configuration block for this plugin, or NULL if none
* is configured
* @return true if the plugin was initialized successfully, false if
* the plugin is not available
*/
static inline bool
decoder_plugin_init(const struct decoder_plugin *plugin,
const struct config_param *param)
{
return plugin->init != NULL
? plugin->init(param)
: true;
}
/**
* Deinitialize a decoder plugin which was initialized successfully.
*/
static inline void
decoder_plugin_finish(const struct decoder_plugin *plugin)
{
if (plugin->finish != NULL)
plugin->finish();
}
/**
* Decode a stream.
*/
static inline void
decoder_plugin_stream_decode(const struct decoder_plugin *plugin,
struct decoder *decoder, struct input_stream *is)
{
plugin->stream_decode(decoder, is);
}
/**
* Decode a file.
*/
static inline void
decoder_plugin_file_decode(const struct decoder_plugin *plugin,
struct decoder *decoder, const char *path_fs)
{
plugin->file_decode(decoder, path_fs);
}
/**
* Read the tag of a file.
*/
static inline struct tag *
decoder_plugin_tag_dup(const struct decoder_plugin *plugin,
const char *path_fs)
{
return plugin->tag_dup(path_fs);
}
#endif
|
