129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/*
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* ALSA sequencer Ports
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* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __SND_SEQ_PORTS_H
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#define __SND_SEQ_PORTS_H
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#include <sound/seq_kernel.h>
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#include "seq_lock.h"
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/* list of 'exported' ports */
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/* Client ports that are not exported are still accessible, but are
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anonymous ports.
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If a port supports SUBSCRIPTION, that port can send events to all
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subscribersto a special address, with address
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(queue==SNDRV_SEQ_ADDRESS_SUBSCRIBERS). The message is then send to all
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recipients that are registered in the subscription list. A typical
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application for these SUBSCRIPTION events is handling of incoming MIDI
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data. The port doesn't 'know' what other clients are interested in this
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message. If for instance a MIDI recording application would like to receive
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the events from that port, it will first have to subscribe with that port.
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*/
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typedef struct subscribers_t {
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snd_seq_port_subscribe_t info; /* additional info */
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struct list_head src_list; /* link of sources */
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struct list_head dest_list; /* link of destinations */
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atomic_t ref_count;
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} subscribers_t;
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typedef struct port_subs_info_t {
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struct list_head list_head; /* list of subscribed ports */
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unsigned int count; /* count of subscribers */
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unsigned int exclusive: 1; /* exclusive mode */
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struct rw_semaphore list_mutex;
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rwlock_t list_lock;
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snd_seq_kernel_port_open_t *open;
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snd_seq_kernel_port_close_t *close;
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} port_subs_info_t;
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typedef struct client_port_t {
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snd_seq_addr_t addr; /* client/port number */
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struct module *owner; /* owner of this port */
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char name[64]; /* port name */
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struct list_head list; /* port list */
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snd_use_lock_t use_lock;
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/* subscribers */
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port_subs_info_t c_src; /* read (sender) list */
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port_subs_info_t c_dest; /* write (dest) list */
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snd_seq_kernel_port_input_t *event_input;
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snd_seq_kernel_port_private_free_t *private_free;
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void *private_data;
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unsigned int callback_all : 1;
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unsigned int closing : 1;
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unsigned int timestamping: 1;
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unsigned int time_real: 1;
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int time_queue;
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/* capability, inport, output, sync */
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unsigned int capability; /* port capability bits */
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unsigned int type; /* port type bits */
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/* supported channels */
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int midi_channels;
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int midi_voices;
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int synth_voices;
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} client_port_t;
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/* return pointer to port structure and lock port */
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client_port_t *snd_seq_port_use_ptr(client_t *client, int num);
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/* search for next port - port is locked if found */
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client_port_t *snd_seq_port_query_nearest(client_t *client, snd_seq_port_info_t *pinfo);
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/* unlock the port */
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#define snd_seq_port_unlock(port) snd_use_lock_free(&(port)->use_lock)
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/* create a port, port number is returned (-1 on failure) */
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client_port_t *snd_seq_create_port(client_t *client, int port_index);
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/* delete a port */
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int snd_seq_delete_port(client_t *client, int port);
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/* delete all ports */
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int snd_seq_delete_all_ports(client_t *client);
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/* set port info fields */
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int snd_seq_set_port_info(client_port_t *port, snd_seq_port_info_t *info);
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/* get port info fields */
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int snd_seq_get_port_info(client_port_t *port, snd_seq_port_info_t *info);
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/* add subscriber to subscription list */
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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);
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/* remove subscriber from subscription list */
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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);
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/* subscribe port */
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int snd_seq_port_subscribe(client_port_t *port, snd_seq_port_subscribe_t *info);
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/* get matched subscriber */
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subscribers_t *snd_seq_port_get_subscription(port_subs_info_t *src_grp, snd_seq_addr_t *dest_addr);
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#endif
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