diff options
Diffstat (limited to 'sound/core/seq/seq_ports.h')
| -rw-r--r-- | sound/core/seq/seq_ports.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/sound/core/seq/seq_ports.h b/sound/core/seq/seq_ports.h new file mode 100644 index 00000000..9d711711 --- /dev/null +++ b/sound/core/seq/seq_ports.h @@ -0,0 +1,142 @@ +/* + * 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. + +*/ + +struct snd_seq_subscribers { + struct snd_seq_port_subscribe info; /* additional info */ + struct list_head src_list; /* link of sources */ + struct list_head dest_list; /* link of destinations */ + atomic_t ref_count; +}; + +struct snd_seq_port_subs_info { + 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; + int (*open)(void *private_data, struct snd_seq_port_subscribe *info); + int (*close)(void *private_data, struct snd_seq_port_subscribe *info); +}; + +struct snd_seq_client_port { + + struct snd_seq_addr 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 */ + struct snd_seq_port_subs_info c_src; /* read (sender) list */ + struct snd_seq_port_subs_info c_dest; /* write (dest) list */ + + int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, + int atomic, int hop); + void (*private_free)(void *private_data); + 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; + +}; + +struct snd_seq_client; + +/* return pointer to port structure and lock port */ +struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client, int num); + +/* search for next port - port is locked if found */ +struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client, + struct snd_seq_port_info *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) */ +struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, int port_index); + +/* delete a port */ +int snd_seq_delete_port(struct snd_seq_client *client, int port); + +/* delete all ports */ +int snd_seq_delete_all_ports(struct snd_seq_client *client); + +/* set port info fields */ +int snd_seq_set_port_info(struct snd_seq_client_port *port, + struct snd_seq_port_info *info); + +/* get port info fields */ +int snd_seq_get_port_info(struct snd_seq_client_port *port, + struct snd_seq_port_info *info); + +/* add subscriber to subscription list */ +int snd_seq_port_connect(struct snd_seq_client *caller, + struct snd_seq_client *s, struct snd_seq_client_port *sp, + struct snd_seq_client *d, struct snd_seq_client_port *dp, + struct snd_seq_port_subscribe *info); + +/* remove subscriber from subscription list */ +int snd_seq_port_disconnect(struct snd_seq_client *caller, + struct snd_seq_client *s, struct snd_seq_client_port *sp, + struct snd_seq_client *d, struct snd_seq_client_port *dp, + struct snd_seq_port_subscribe *info); + +/* subscribe port */ +int snd_seq_port_subscribe(struct snd_seq_client_port *port, + struct snd_seq_port_subscribe *info); + +/* get matched subscriber */ +struct snd_seq_subscribers *snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, + struct snd_seq_addr *dest_addr); + +#endif |