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127 lines
4.2 KiB
127 lines
4.2 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* ALSA sequencer Ports |
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* Copyright (c) 1998 by Frank van de Pol <[email protected]> |
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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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struct snd_seq_subscribers { |
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struct snd_seq_port_subscribe 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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}; |
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struct snd_seq_port_subs_info { |
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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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int (*open)(void *private_data, struct snd_seq_port_subscribe *info); |
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int (*close)(void *private_data, struct snd_seq_port_subscribe *info); |
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}; |
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struct snd_seq_client_port { |
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struct snd_seq_addr 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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struct snd_seq_port_subs_info c_src; /* read (sender) list */ |
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struct snd_seq_port_subs_info c_dest; /* write (dest) list */ |
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int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, |
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int atomic, int hop); |
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void (*private_free)(void *private_data); |
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void *private_data; |
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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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}; |
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struct snd_seq_client; |
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/* return pointer to port structure and lock port */ |
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struct snd_seq_client_port *snd_seq_port_use_ptr(struct snd_seq_client *client, int num); |
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/* search for next port - port is locked if found */ |
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struct snd_seq_client_port *snd_seq_port_query_nearest(struct snd_seq_client *client, |
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struct snd_seq_port_info *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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struct snd_seq_client_port *snd_seq_create_port(struct snd_seq_client *client, int port_index); |
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/* delete a port */ |
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int snd_seq_delete_port(struct snd_seq_client *client, int port); |
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/* delete all ports */ |
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int snd_seq_delete_all_ports(struct snd_seq_client *client); |
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/* set port info fields */ |
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int snd_seq_set_port_info(struct snd_seq_client_port *port, |
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struct snd_seq_port_info *info); |
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/* get port info fields */ |
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int snd_seq_get_port_info(struct snd_seq_client_port *port, |
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struct snd_seq_port_info *info); |
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/* add subscriber to subscription list */ |
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int snd_seq_port_connect(struct snd_seq_client *caller, |
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struct snd_seq_client *s, struct snd_seq_client_port *sp, |
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struct snd_seq_client *d, struct snd_seq_client_port *dp, |
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struct snd_seq_port_subscribe *info); |
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/* remove subscriber from subscription list */ |
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int snd_seq_port_disconnect(struct snd_seq_client *caller, |
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struct snd_seq_client *s, struct snd_seq_client_port *sp, |
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struct snd_seq_client *d, struct snd_seq_client_port *dp, |
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struct snd_seq_port_subscribe *info); |
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/* subscribe port */ |
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int snd_seq_port_subscribe(struct snd_seq_client_port *port, |
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struct snd_seq_port_subscribe *info); |
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/* get matched subscriber */ |
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int snd_seq_port_get_subscription(struct snd_seq_port_subs_info *src_grp, |
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struct snd_seq_addr *dest_addr, |
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struct snd_seq_port_subscribe *subs); |
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#endif
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