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
|
/*
* ALSA sequencer Ports
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
*
*
* 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 __SND_SEQ_PORTS_H
#define __SND_SEQ_PORTS_H
#include <sound/seq_kernel.h>
#include "seq_lock.h"
/* list of 'exported' ports */
/* Client ports that are not exported are still accessible, but are
anonymous ports.
If a port supports SUBSCRIPTION, that port can send events to all
subscribersto a special address, with address
(queue==SNDRV_SEQ_ADDRESS_SUBSCRIBERS). The message is then send to all
recipients that are registered in the subscription list. A typical
application for these SUBSCRIPTION events is handling of incoming MIDI
data. The port doesn't 'know' what other clients are interested in this
message. If for instance a MIDI recording application would like to receive
the events from that port, it will first have to subscribe with that port.
*/
typedef struct subscribers_t {
snd_seq_port_subscribe_t info; /* additional info */
struct list_head src_list; /* link of sources */
struct list_head dest_list; /* link of destinations */
atomic_t ref_count;
} subscribers_t;
typedef struct port_subs_info_t {
struct list_head list_head; /* list of subscribed ports */
unsigned int count; /* count of subscribers */
unsigned int exclusive: 1; /* exclusive mode */
struct rw_semaphore list_mutex;
rwlock_t list_lock;
snd_seq_kernel_port_open_t *open;
snd_seq_kernel_port_close_t *close;
} port_subs_info_t;
typedef struct client_port_t {
snd_seq_addr_t addr; /* client/port number */
struct module *owner; /* owner of this port */
char name[64]; /* port name */
struct list_head list; /* port list */
snd_use_lock_t use_lock;
/* subscribers */
port_subs_info_t c_src; /* read (sender) list */
port_subs_info_t c_dest; /* write (dest) list */
snd_seq_kernel_port_input_t *event_input;
snd_seq_kernel_port_private_free_t *private_free;
void *private_data;
unsigned int callback_all : 1;
unsigned int closing : 1;
unsigned int timestamping: 1;
unsigned int time_real: 1;
int time_queue;
/* capability, inport, output, sync */
unsigned int capability; /* port capability bits */
unsigned int type; /* port type bits */
/* supported channels */
int midi_channels;
int midi_voices;
int synth_voices;
} client_port_t;
/* return pointer to port structure and lock port */
client_port_t *snd_seq_port_use_ptr(client_t *client, int num);
/* search for next port - port is locked if found */
client_port_t *snd_seq_port_query_nearest(client_t *client, snd_seq_port_info_t *pinfo);
/* unlock the port */
#define snd_seq_port_unlock(port) snd_use_lock_free(&(port)->use_lock)
/* create a port, port number is returned (-1 on failure) */
client_port_t *snd_seq_create_port(client_t *client, int port_index);
/* delete a port */
int snd_seq_delete_port(client_t *client, int port);
/* delete all ports */
int snd_seq_delete_all_ports(client_t *client);
/* set port info fields */
int snd_seq_set_port_info(client_port_t *port, snd_seq_port_info_t *info);
/* get port info fields */
int snd_seq_get_port_info(client_port_t *port, snd_seq_port_info_t *info);
/* add subscriber to subscription list */
int snd_seq_port_connect(client_t *caller, client_t *s, client_port_t *sp, client_t *d, client_port_t *dp, snd_seq_port_subscribe_t *info);
/* remove subscriber from subscription list */
int snd_seq_port_disconnect(client_t *caller, client_t *s, client_port_t *sp, client_t *d, client_port_t *dp, snd_seq_port_subscribe_t *info);
/* subscribe port */
int snd_seq_port_subscribe(client_port_t *port, snd_seq_port_subscribe_t *info);
/* get matched subscriber */
subscribers_t *snd_seq_port_get_subscription(port_subs_info_t *src_grp, snd_seq_addr_t *dest_addr);
#endif
|
