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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: 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_API_H
#define MPD_DECODER_API_H
/*
* This is the public API which is used by decoder plugins to
* communicate with the mpd core.
*
*/
#include "input_stream.h"
#include "replayGain.h"
#include "tag.h"
#include "tag_id3.h"
#include "audio_format.h"
#include "playerData.h"
#include <stdbool.h>
enum decoder_command {
DECODE_COMMAND_NONE = 0,
DECODE_COMMAND_START,
DECODE_COMMAND_STOP,
DECODE_COMMAND_SEEK
};
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)(void);
/**
* 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)
*/
bool (*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)
*/
bool (*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;
};
/**
* Opaque handle which the decoder plugin passes to the functions in
* this header.
*/
struct decoder;
/**
* Notify the player thread that it has finished initialization and
* that it has read the song's meta data.
*/
void decoder_initialized(struct decoder * decoder,
const struct audio_format *audio_format,
bool seekable, float total_time);
const char *decoder_get_url(struct decoder * decoder, char * buffer);
enum decoder_command decoder_get_command(struct decoder * decoder);
/**
* Called by the decoder when it has performed the requested command
* (dc->command). This function resets dc->command and wakes up the
* player thread.
*/
void decoder_command_finished(struct decoder * decoder);
double decoder_seek_where(struct decoder * decoder);
void decoder_seek_error(struct decoder * decoder);
/**
* Blocking read from the input stream. Returns the number of bytes
* read, or 0 if one of the following occurs: end of file; error;
* command (like SEEK or STOP).
*/
size_t decoder_read(struct decoder *decoder,
struct input_stream *inStream,
void *buffer, size_t length);
/**
* This function is called by the decoder plugin when it has
* successfully decoded block of input data.
*
* We send inStream for buffering the inputStream while waiting to
* send the next chunk
*/
enum decoder_command
decoder_data(struct decoder *decoder,
struct input_stream *inStream,
void *data, size_t datalen, float data_time, uint16_t bitRate,
ReplayGainInfo * replayGainInfo);
/**
* This function is called by the decoder plugin when it has
* successfully decoded a tag.
*
* @param is an input stream which is buffering while we are waiting
* for the player
*/
enum decoder_command
decoder_tag(struct decoder *decoder, struct input_stream *is,
const struct tag *tag);
#endif
|
