seq_kernel.h (3378B)
1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2#ifndef __SOUND_SEQ_KERNEL_H 3#define __SOUND_SEQ_KERNEL_H 4 5/* 6 * Main kernel header file for the ALSA sequencer 7 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl> 8 */ 9#include <linux/time.h> 10#include <sound/asequencer.h> 11 12typedef struct snd_seq_real_time snd_seq_real_time_t; 13typedef union snd_seq_timestamp snd_seq_timestamp_t; 14 15/* maximum number of queues */ 16#define SNDRV_SEQ_MAX_QUEUES 32 17 18/* max number of concurrent clients */ 19#define SNDRV_SEQ_MAX_CLIENTS 192 20 21/* max number of concurrent ports */ 22#define SNDRV_SEQ_MAX_PORTS 254 23 24/* max number of events in memory pool */ 25#define SNDRV_SEQ_MAX_EVENTS 2000 26 27/* default number of events in memory pool */ 28#define SNDRV_SEQ_DEFAULT_EVENTS 500 29 30/* max number of events in memory pool for one client (outqueue) */ 31#define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000 32 33/* default number of events in memory pool for one client (outqueue) */ 34#define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200 35 36/* max delivery path length */ 37/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */ 38#define SNDRV_SEQ_MAX_HOPS 8 39 40/* max size of event size */ 41#define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff 42 43/* call-backs for kernel port */ 44struct snd_seq_port_callback { 45 struct module *owner; 46 void *private_data; 47 int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info); 48 int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info); 49 int (*use)(void *private_data, struct snd_seq_port_subscribe *info); 50 int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info); 51 int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop); 52 void (*private_free)(void *private_data); 53 /*...*/ 54}; 55 56/* interface for kernel client */ 57__printf(3, 4) 58int snd_seq_create_kernel_client(struct snd_card *card, int client_index, 59 const char *name_fmt, ...); 60int snd_seq_delete_kernel_client(int client); 61int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, 62 struct file *file, bool blocking); 63int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop); 64int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg); 65 66#define SNDRV_SEQ_EXT_MASK 0xc0000000 67#define SNDRV_SEQ_EXT_USRPTR 0x80000000 68#define SNDRV_SEQ_EXT_CHAINED 0x40000000 69 70typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count); 71int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf, 72 int in_kernel, int size_aligned); 73int snd_seq_dump_var_event(const struct snd_seq_event *event, 74 snd_seq_dump_func_t func, void *private_data); 75 76/* interface for OSS emulation */ 77int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo); 78 79/* port callback routines */ 80void snd_port_init_callback(struct snd_seq_port_callback *p); 81struct snd_seq_port_callback *snd_port_alloc_callback(void); 82 83/* port attach/detach */ 84int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp, 85 int cap, int type, int midi_channels, int midi_voices, char *portname); 86int snd_seq_event_port_detach(int client, int port); 87 88#ifdef CONFIG_MODULES 89void snd_seq_autoload_init(void); 90void snd_seq_autoload_exit(void); 91#else 92#define snd_seq_autoload_init() 93#define snd_seq_autoload_exit() 94#endif 95 96#endif /* __SOUND_SEQ_KERNEL_H */