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/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef __SOUND_SEQ_KERNEL_H #define __SOUND_SEQ_KERNEL_H /* * Main kernel header file for the ALSA sequencer * Copyright (c) 1998 by Frank van de Pol */ #include #include typedef struct snd_seq_real_time snd_seq_real_time_t; typedef union snd_seq_timestamp snd_seq_timestamp_t; /* maximum number of queues */ #define SNDRV_SEQ_MAX_QUEUES 32 /* max number of concurrent clients */ #define SNDRV_SEQ_MAX_CLIENTS 192 /* max number of concurrent ports */ #define SNDRV_SEQ_MAX_PORTS 254 /* max number of events in memory pool */ #define SNDRV_SEQ_MAX_EVENTS 2000 /* default number of events in memory pool */ #define SNDRV_SEQ_DEFAULT_EVENTS 500 /* max number of events in memory pool for one client (outqueue) */ #define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000 /* default number of events in memory pool for one client (outqueue) */ #define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200 /* max delivery path length */ /* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */ #define SNDRV_SEQ_MAX_HOPS 8 /* max size of event size */ #define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff /* call-backs for kernel port */ struct snd_seq_port_callback { struct module *owner; void *private_data; int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info); int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info); int (*use)(void *private_data, struct snd_seq_port_subscribe *info); int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info); int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop); void (*private_free)(void *private_data); /*...*/ }; /* interface for kernel client */ __printf(3, 4) int snd_seq_create_kernel_client(struct snd_card *card, int client_index, const char *name_fmt, ...); int snd_seq_delete_kernel_client(int client); int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, struct file *file, bool blocking); int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop); int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg); #define SNDRV_SEQ_EXT_MASK 0xc0000000 #define SNDRV_SEQ_EXT_USRPTR 0x80000000 #define SNDRV_SEQ_EXT_CHAINED 0x40000000 typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count); int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf, int in_kernel, int size_aligned); int snd_seq_dump_var_event(const struct snd_seq_event *event, snd_seq_dump_func_t func, void *private_data); /* interface for OSS emulation */ int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo); /* port callback routines */ void snd_port_init_callback(struct snd_seq_port_callback *p); struct snd_seq_port_callback *snd_port_alloc_callback(void); /* port attach/detach */ int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *p