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
|
/*
* OSS compatible sequencer driver
*
* seq_oss_writeq.c - write queue and sync
*
* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
*
* 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
*/
#include "seq_oss_writeq.h"
#include "seq_oss_event.h"
#include "seq_oss_timer.h"
#include <sound/seq_oss_legacy.h>
#include "../seq_lock.h"
#include "../seq_clientmgr.h"
#include <linux/wait.h>
/*
* create a write queue record
*/
struct seq_oss_writeq *
snd_seq_oss_writeq_new(struct seq_oss_devinfo *dp, int maxlen)
{
struct seq_oss_writeq *q;
struct snd_seq_client_pool pool;
if ((q = kzalloc(sizeof(*q), GFP_KERNEL)) == NULL)
return NULL;
q->dp = dp;
q->maxlen = maxlen;
spin_lock_init(&q->sync_lock);
q->sync_event_put = 0;
q->sync_time = 0;
init_waitqueue_head(&q->sync_sleep);
memset(&pool, 0, sizeof(pool));
pool.client = dp->cseq;
pool.output_pool = maxlen;
pool.output_room = maxlen / 2;
snd_seq_oss_control(dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool);
return q;
}
/*
* delete the write queue
*/
void
snd_seq_oss_writeq_delete(struct seq_oss_writeq *q)
{
snd_seq_oss_writeq_clear(q); /* to be sure */
kfree(q);
}
/*
* reset the write queue
*/
void
snd_seq_oss_writeq_clear(struct seq_oss_writeq *q)
{
struct snd_seq_remove_events reset;
memset(&reset, 0, sizeof(reset));
reset.remove_mode = SNDRV_SEQ_REMOVE_OUTPUT; /* remove all */
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_REMOVE_EVENTS, &reset);
/* wake up sleepers if any */
snd_seq_oss_writeq_wakeup(q, 0);
}
/*
* wait until the write buffer has enough room
*/
int
snd_seq_oss_writeq_sync(struct seq_oss_writeq *q)
{
struct seq_oss_devinfo *dp = q->dp;
abstime_t time;
time = snd_seq_oss_timer_cur_tick(dp->timer);
if (q->sync_time >= time)
return 0; /* already finished */
if (! q->sync_event_put) {
struct snd_seq_event ev;
union evrec *rec;
/* put echoback event */
memset(&ev, 0, sizeof(ev));
ev.flags = 0;
ev.type = SNDRV_SEQ_EVENT_ECHO;
ev.time.tick = time;
/* echo back to itself */
snd_seq_oss_fill_addr(dp, &ev, dp->addr.client, dp->addr.port);
rec = (union evrec *)&ev.data;
rec->t.code = SEQ_SYNCTIMER;
rec->t.time = time;
q->sync_event_put = 1;
snd_seq_kernel_client_enqueue_blocking(dp->cseq, &ev, NULL, 0, 0);
}
wait_event_interruptible_timeout(q->sync_sleep, ! q->sync_event_put, HZ);
if (signal_pending(current))
/* interrupted - return 0 to finish sync */
q->sync_event_put = 0;
if (! q->sync_event_put || q->sync_time >= time)
return 0;
return 1;
}
/*
* wake up sync - echo event was catched
*/
void
snd_seq_oss_writeq_wakeup(struct seq_oss_writeq *q, abstime_t time)
{
unsigned long flags;
spin_lock_irqsave(&q->sync_lock, flags);
q->sync_time = time;
q->sync_event_put = 0;
if (waitqueue_active(&q->sync_sleep)) {
wake_up(&q->sync_sleep);
}
spin_unlock_irqrestore(&q->sync_lock, flags);
}
/*
* return the unused pool size
*/
int
snd_seq_oss_writeq_get_free_size(struct seq_oss_writeq *q)
{
struct snd_seq_client_pool pool;
pool.client = q->dp->cseq;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool);
return pool.output_free;
}
/*
* set output threshold size from ioctl
*/
void
snd_seq_oss_writeq_set_output(struct seq_oss_writeq *q, int val)
{
struct snd_seq_client_pool pool;
pool.client = q->dp->cseq;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool);
pool.output_room = val;
snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool);
}
|
