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
160
161
162
163
164
165
|
/*
* 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.
*/
#include "config.h"
#include "StateFile.hxx"
#include "OutputState.hxx"
#include "playlist.h"
#include "PlaylistState.hxx"
#include "TextFile.hxx"
extern "C" {
#include "volume.h"
}
#include <glib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "state_file"
static char *state_file_path;
/** the GLib source id for the save timer */
static guint save_state_source_id;
/**
* These version numbers determine whether we need to save the state
* file. If nothing has changed, we won't let the hard drive spin up.
*/
static unsigned prev_volume_version, prev_output_version,
prev_playlist_version;
static void
state_file_write(struct player_control *pc)
{
FILE *fp;
assert(state_file_path != NULL);
g_debug("Saving state file %s", state_file_path);
fp = fopen(state_file_path, "w");
if (G_UNLIKELY(!fp)) {
g_warning("failed to create %s: %s",
state_file_path, g_strerror(errno));
return;
}
save_sw_volume_state(fp);
audio_output_state_save(fp);
playlist_state_save(fp, &g_playlist, pc);
fclose(fp);
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist, pc);
}
static void
state_file_read(struct player_control *pc)
{
FILE *fp;
bool success;
assert(state_file_path != NULL);
g_debug("Loading state file %s", state_file_path);
fp = fopen(state_file_path, "r");
if (G_UNLIKELY(!fp)) {
g_warning("failed to open %s: %s",
state_file_path, g_strerror(errno));
return;
}
GString *buffer = g_string_sized_new(1024);
const char *line;
while ((line = read_text_line(fp, buffer)) != NULL) {
success = read_sw_volume_state(line) ||
audio_output_state_read(line) ||
playlist_state_restore(line, fp, buffer,
&g_playlist, pc);
if (!success)
g_warning("Unrecognized line in state file: %s", line);
}
fclose(fp);
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(&g_playlist, pc);
g_string_free(buffer, true);
}
/**
* This function is called every 5 minutes by the GLib main loop, and
* saves the state file.
*/
static gboolean
timer_save_state_file(gpointer data)
{
struct player_control *pc = (struct player_control *)data;
if (prev_volume_version == sw_volume_state_get_hash() &&
prev_output_version == audio_output_state_get_version() &&
prev_playlist_version == playlist_state_get_hash(&g_playlist, pc))
/* nothing has changed - don't save the state file,
don't spin up the hard disk */
return true;
state_file_write(pc);
return true;
}
void
state_file_init(const char *path, struct player_control *pc)
{
assert(state_file_path == NULL);
if (path == NULL)
return;
state_file_path = g_strdup(path);
state_file_read(pc);
save_state_source_id = g_timeout_add_seconds(5 * 60,
timer_save_state_file,
pc);
}
void
state_file_finish(struct player_control *pc)
{
if (state_file_path == NULL)
/* no state file configured, no cleanup required */
return;
if (save_state_source_id != 0)
g_source_remove(save_state_source_id);
state_file_write(pc);
g_free(state_file_path);
}
|
