root/include/sound/seq_kernel.h

INCLUDED FROM

   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 
  12 typedef struct snd_seq_real_time snd_seq_real_time_t;
  13 typedef 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 */
  44 struct 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)
  58 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
  59                                  const char *name_fmt, ...);
  60 int snd_seq_delete_kernel_client(int client);
  61 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
  62                                   struct file *file, bool blocking);
  63 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop);
  64 int 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 
  70 typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count);
  71 int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
  72                              int in_kernel, int size_aligned);
  73 int 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 */
  77 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo);
  78 
  79 /* port callback routines */
  80 void snd_port_init_callback(struct snd_seq_port_callback *p);
  81 struct snd_seq_port_callback *snd_port_alloc_callback(void);
  82 
  83 /* port attach/detach */
  84 int 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);
  86 int snd_seq_event_port_detach(int client, int port);
  87 
  88 #ifdef CONFIG_MODULES
  89 void snd_seq_autoload_init(void);
  90 void 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 */