include/control.h

   1 /****************************************************************************
   2  *                                                                          *
   3  *                              control.h                                   *
   4  *                          Control Interface                               *
   5  *                                                                          *
   6  ****************************************************************************/
   7
   8 typedef struct snd_ctl snd_ctl_t;
   9
  10 typedef enum { SND_CTL_TYPE_HW,
  11                SND_CTL_TYPE_SHM,
  12                SND_CTL_TYPE_INET
  13  } snd_ctl_type_t;
  14
  15 typedef struct snd_ctl_callbacks {
  16         void *private_data;     /* may be used by an application */
  17         void (*rebuild) (snd_ctl_t *handle, void *private_data);
  18         void (*value) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
  19         void (*change) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
  20         void (*add) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
  21         void (*remove) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
  22         void *reserved[58];     /* reserved for the future use - must be NULL!!! */
  23 } snd_ctl_callbacks_t;
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29 int snd_card_load(int card);
  30 int snd_cards(void);
  31 unsigned int snd_cards_mask(void);
  32 int snd_card_get_index(const char *name);
  33 int snd_card_get_name(int card, char **name);
  34 int snd_card_get_longname(int card, char **name);
  35
  36 int snd_defaults_card(void);
  37 int snd_defaults_mixer_card(void);
  38 int snd_defaults_pcm_card(void);
  39 int snd_defaults_pcm_device(void);
  40 int snd_defaults_rawmidi_card(void);
  41 int snd_defaults_rawmidi_device(void);
  42
  43 int snd_ctl_hw_open(snd_ctl_t **handle, char *name, int card);
  44 int snd_ctl_shm_open(snd_ctl_t **handlep, char *name, char *socket, char *sname);
  45 snd_ctl_type_t snd_ctl_type(snd_ctl_t *handle);
  46 int snd_ctl_open(snd_ctl_t **handle, char *name);
  47 int snd_ctl_close(snd_ctl_t *handle);
  48 int snd_ctl_poll_descriptor(snd_ctl_t *handle);
  49 int snd_ctl_hw_info(snd_ctl_t *handle, snd_ctl_hw_info_t *info);
  50 int snd_ctl_clist(snd_ctl_t *handle, snd_control_list_t * list);
  51 int snd_ctl_cinfo(snd_ctl_t *handle, snd_control_info_t * sw);
  52 int snd_ctl_cread(snd_ctl_t *handle, snd_control_t * control);
  53 int snd_ctl_cwrite(snd_ctl_t *handle, snd_control_t * control);
  54 int snd_ctl_hwdep_info(snd_ctl_t *handle, snd_hwdep_info_t * info);
  55 int snd_ctl_pcm_info(snd_ctl_t *handle, snd_pcm_info_t * info);
  56 int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *handle, int subdev);
  57 int snd_ctl_rawmidi_info(snd_ctl_t *handle, snd_rawmidi_info_t * info);
  58
  59 int snd_ctl_read(snd_ctl_t *handle, snd_ctl_callbacks_t * callbacks);
  60
  61 #ifdef __cplusplus
  62 }
  63 #endif
  64
  65 /*
  66  *  Highlevel API for controls
  67  */
  68
  69 #define LIST_HEAD_IS_DEFINED
  70 struct list_head {
  71         struct list_head *next, *prev;
  72 };
  73
  74 /**
  75  * list_entry - get the struct for this entry
  76  * @ptr:        the &struct list_head pointer.
  77  * @type:       the type of the struct this is embedded in.
  78  * @member:     the name of the list_struct within the struct.
  79  */
  80 #define list_entry(ptr, type, member) \
  81         ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
  82
  83
  84 typedef struct snd_hcontrol_list_stru snd_hcontrol_list_t;
  85 typedef struct snd_hcontrol_stru snd_hcontrol_t;
  86
  87 struct snd_hcontrol_list_stru {
  88         unsigned int controls_offset;   /* W: first control ID to get */
  89         unsigned int controls_request;  /* W: count of control IDs to get */
  90         unsigned int controls_count;    /* R: count of available (set) controls */
  91         unsigned int controls;          /* R: count of all available controls */
  92         snd_control_id_t *pids;         /* W: IDs */
  93 };
  94
  95 struct snd_hcontrol_stru {
  96         snd_control_id_t id;    /* must be always on top */
  97         struct list_head list;  /* links for list of all hcontrols */
  98         int change: 1,          /* structure change */
  99             value: 1;           /* value change */
 100         /* event callbacks */
 101         void (*event_change)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
 102         void (*event_value)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
 103         void (*event_remove)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
 104         /* private data */
 105         void *private_data;
 106         void (*private_free)(void *private_data);
 107         /* links */
 108         snd_ctl_t *handle;      /* associated handle */
 109 };
 110
 111 #ifdef __cplusplus
 112 extern "C" {
 113 #endif
 114
 115 typedef int (snd_ctl_hsort_t)(const snd_hcontrol_t *c1, const snd_hcontrol_t *c2);
 116 typedef void (snd_ctl_hcallback_rebuild_t)(snd_ctl_t *handle, void *private_data);
 117 typedef void (snd_ctl_hcallback_add_t)(snd_ctl_t *handle, void *private_data, snd_hcontrol_t *hcontrol);
 118
 119 int snd_ctl_hbuild(snd_ctl_t *handle, snd_ctl_hsort_t *csort);
 120 int snd_ctl_hfree(snd_ctl_t *handle);
 121 snd_hcontrol_t *snd_ctl_hfirst(snd_ctl_t *handle);
 122 snd_hcontrol_t *snd_ctl_hlast(snd_ctl_t *handle);
 123 snd_hcontrol_t *snd_ctl_hnext(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
 124 snd_hcontrol_t *snd_ctl_hprev(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
 125 int snd_ctl_hcount(snd_ctl_t *handle);
 126 snd_hcontrol_t *snd_ctl_hfind(snd_ctl_t *handle, snd_control_id_t *id);
 127 int snd_ctl_hlist(snd_ctl_t *handle, snd_hcontrol_list_t *hlist);
 128 int snd_ctl_hsort(const snd_hcontrol_t *c1, const snd_hcontrol_t *c2);
 129 int snd_ctl_hresort(snd_ctl_t *handle, snd_ctl_hsort_t *csort);
 130 int snd_ctl_hcallback_rebuild(snd_ctl_t *handle, snd_ctl_hcallback_rebuild_t *callback, void *private_data);
 131 int snd_ctl_hcallback_add(snd_ctl_t *handle, snd_ctl_hcallback_add_t *callback, void *private_data);
 132 int snd_ctl_hevent(snd_ctl_t *handle);
 133
 134 int snd_ctl_hbag_create(void **bag);
 135 int snd_ctl_hbag_destroy(void **bag, void (*hcontrol_free)(snd_hcontrol_t *hcontrol));
 136 int snd_ctl_hbag_add(void **bag, snd_hcontrol_t *hcontrol);
 137 int snd_ctl_hbag_del(void **bag, snd_hcontrol_t *hcontrol);
 138 snd_hcontrol_t *snd_ctl_hbag_find(void **bag, snd_control_id_t *id);
 139
 140 #ifdef __cplusplus
 141 }
 142 #endif
 143