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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright (C) 2003-2011 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 "pipe.h"
#include "buffer.h"
#include "chunk.h"
#include <glib.h>
#include <assert.h>
struct music_pipe {
/** the first chunk */
struct music_chunk *head;
/** a pointer to the tail of the chunk */
struct music_chunk **tail_r;
/** the current number of chunks */
unsigned size;
/** a mutex which protects #head and #tail_r */
GMutex *mutex;
#ifndef NDEBUG
struct audio_format audio_format;
#endif
};
struct music_pipe *
music_pipe_new(void)
{
struct music_pipe *mp = g_new(struct music_pipe, 1);
mp->head = NULL;
mp->tail_r = &mp->head;
mp->size = 0;
mp->mutex = g_mutex_new();
#ifndef NDEBUG
audio_format_clear(&mp->audio_format);
#endif
return mp;
}
void
music_pipe_free(struct music_pipe *mp)
{
assert(mp->head == NULL);
assert(mp->tail_r == &mp->head);
g_mutex_free(mp->mutex);
g_free(mp);
}
#ifndef NDEBUG
bool
music_pipe_check_format(const struct music_pipe *pipe,
const struct audio_format *audio_format)
{
assert(pipe != NULL);
assert(audio_format != NULL);
return !audio_format_defined(&pipe->audio_format) ||
audio_format_equals(&pipe->audio_format, audio_format);
}
bool
music_pipe_contains(const struct music_pipe *mp,
const struct music_chunk *chunk)
{
g_mutex_lock(mp->mutex);
for (const struct music_chunk *i = mp->head;
i != NULL; i = i->next) {
if (i == chunk) {
g_mutex_unlock(mp->mutex);
return true;
}
}
g_mutex_unlock(mp->mutex);
return false;
}
#endif
const struct music_chunk *
music_pipe_peek(const struct music_pipe *mp)
{
return mp->head;
}
struct music_chunk *
music_pipe_shift(struct music_pipe *mp)
{
struct music_chunk *chunk;
g_mutex_lock(mp->mutex);
chunk = mp->head;
if (chunk != NULL) {
assert(!music_chunk_is_empty(chunk));
mp->head = chunk->next;
--mp->size;
if (mp->head == NULL) {
assert(mp->size == 0);
assert(mp->tail_r == &chunk->next);
mp->tail_r = &mp->head;
} else {
assert(mp->size > 0);
assert(mp->tail_r != &chunk->next);
}
#ifndef NDEBUG
/* poison the "next" reference */
chunk->next = (void*)0x01010101;
if (mp->size == 0)
audio_format_clear(&mp->audio_format);
#endif
}
g_mutex_unlock(mp->mutex);
return chunk;
}
void
music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer)
{
struct music_chunk *chunk;
while ((chunk = music_pipe_shift(mp)) != NULL)
music_buffer_return(buffer, chunk);
}
void
music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk)
{
assert(!music_chunk_is_empty(chunk));
assert(chunk->length == 0 || audio_format_valid(&chunk->audio_format));
g_mutex_lock(mp->mutex);
assert(mp->size > 0 || !audio_format_defined(&mp->audio_format));
assert(!audio_format_defined(&mp->audio_format) ||
music_chunk_check_format(chunk, &mp->audio_format));
#ifndef NDEBUG
if (!audio_format_defined(&mp->audio_format) && chunk->length > 0)
mp->audio_format = chunk->audio_format;
#endif
chunk->next = NULL;
*mp->tail_r = chunk;
mp->tail_r = &chunk->next;
++mp->size;
g_mutex_unlock(mp->mutex);
}
unsigned
music_pipe_size(const struct music_pipe *mp)
{
return mp->size;
}
|
