mirror of
https://github.com/alsa-project/alsa-lib.git
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140 lines
5.6 KiB
C
140 lines
5.6 KiB
C
/****************************************************************************
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* *
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* control.h *
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* Control Interface *
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* *
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****************************************************************************/
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typedef struct snd_ctl snd_ctl_t;
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typedef enum { SND_CTL_TYPE_HW, SND_CTL_TYPE_CLIENT } snd_ctl_type_t;
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typedef struct snd_ctl_callbacks {
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void *private_data; /* may be used by an application */
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void (*rebuild) (snd_ctl_t *handle, void *private_data);
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void (*value) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
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void (*change) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
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void (*add) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
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void (*remove) (snd_ctl_t *handle, void *private_data, snd_control_id_t * id);
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void *reserved[58]; /* reserved for the future use - must be NULL!!! */
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} snd_ctl_callbacks_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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int snd_card_load(int card);
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int snd_cards(void);
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unsigned int snd_cards_mask(void);
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int snd_card_get_index(const char *name);
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int snd_card_get_name(int card, char **name);
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int snd_card_get_longname(int card, char **name);
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int snd_defaults_card(void);
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int snd_defaults_mixer_card(void);
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int snd_defaults_pcm_card(void);
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int snd_defaults_pcm_device(void);
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int snd_defaults_rawmidi_card(void);
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int snd_defaults_rawmidi_device(void);
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int snd_ctl_hw_open(snd_ctl_t **handle, int card);
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int snd_ctl_client_open(snd_ctl_t **handlep, char *host, int port, int transport, char *name);
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snd_ctl_type_t snd_ctl_type(snd_ctl_t *handle);
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int snd_ctl_open(snd_ctl_t **handle, char *name);
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int snd_ctl_close(snd_ctl_t *handle);
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int snd_ctl_poll_descriptor(snd_ctl_t *handle);
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int snd_ctl_hw_info(snd_ctl_t *handle, snd_ctl_hw_info_t *info);
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int snd_ctl_clist(snd_ctl_t *handle, snd_control_list_t * list);
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int snd_ctl_cinfo(snd_ctl_t *handle, snd_control_info_t * sw);
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int snd_ctl_cread(snd_ctl_t *handle, snd_control_t * control);
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int snd_ctl_cwrite(snd_ctl_t *handle, snd_control_t * control);
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int snd_ctl_hwdep_info(snd_ctl_t *handle, snd_hwdep_info_t * info);
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int snd_ctl_pcm_info(snd_ctl_t *handle, snd_pcm_info_t * info);
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int snd_ctl_pcm_prefer_subdevice(snd_ctl_t *handle, int subdev);
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int snd_ctl_rawmidi_info(snd_ctl_t *handle, snd_rawmidi_info_t * info);
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int snd_ctl_read(snd_ctl_t *handle, snd_ctl_callbacks_t * callbacks);
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#ifdef __cplusplus
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}
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#endif
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/*
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* Highlevel API for controls
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*/
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#define LIST_HEAD_IS_DEFINED
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struct list_head {
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struct list_head *next, *prev;
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};
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/**
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* list_entry - get the struct for this entry
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* @ptr: the &struct list_head pointer.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_entry(ptr, type, member) \
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((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
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typedef struct snd_hcontrol_list_stru snd_hcontrol_list_t;
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typedef struct snd_hcontrol_stru snd_hcontrol_t;
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struct snd_hcontrol_list_stru {
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unsigned int controls_offset; /* W: first control ID to get */
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unsigned int controls_request; /* W: count of control IDs to get */
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unsigned int controls_count; /* R: count of available (set) controls */
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unsigned int controls; /* R: count of all available controls */
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snd_control_id_t *pids; /* W: IDs */
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};
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struct snd_hcontrol_stru {
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snd_control_id_t id; /* must be always on top */
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struct list_head list; /* links for list of all hcontrols */
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int change: 1, /* structure change */
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value: 1; /* value change */
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/* event callbacks */
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void (*event_change)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
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void (*event_value)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
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void (*event_remove)(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
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/* private data */
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void *private_data;
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void (*private_free)(void *private_data);
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/* links */
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snd_ctl_t *handle; /* associated handle */
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int (snd_ctl_hsort_t)(const snd_hcontrol_t *c1, const snd_hcontrol_t *c2);
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typedef void (snd_ctl_hcallback_rebuild_t)(snd_ctl_t *handle, void *private_data);
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typedef void (snd_ctl_hcallback_add_t)(snd_ctl_t *handle, void *private_data, snd_hcontrol_t *hcontrol);
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int snd_ctl_hbuild(snd_ctl_t *handle, snd_ctl_hsort_t *csort);
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int snd_ctl_hfree(snd_ctl_t *handle);
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snd_hcontrol_t *snd_ctl_hfirst(snd_ctl_t *handle);
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snd_hcontrol_t *snd_ctl_hlast(snd_ctl_t *handle);
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snd_hcontrol_t *snd_ctl_hnext(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
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snd_hcontrol_t *snd_ctl_hprev(snd_ctl_t *handle, snd_hcontrol_t *hcontrol);
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int snd_ctl_hcount(snd_ctl_t *handle);
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snd_hcontrol_t *snd_ctl_hfind(snd_ctl_t *handle, snd_control_id_t *id);
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int snd_ctl_hlist(snd_ctl_t *handle, snd_hcontrol_list_t *hlist);
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int snd_ctl_hsort(const snd_hcontrol_t *c1, const snd_hcontrol_t *c2);
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int snd_ctl_hresort(snd_ctl_t *handle, snd_ctl_hsort_t *csort);
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int snd_ctl_hcallback_rebuild(snd_ctl_t *handle, snd_ctl_hcallback_rebuild_t *callback, void *private_data);
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int snd_ctl_hcallback_add(snd_ctl_t *handle, snd_ctl_hcallback_add_t *callback, void *private_data);
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int snd_ctl_hevent(snd_ctl_t *handle);
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int snd_ctl_hbag_create(void **bag);
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int snd_ctl_hbag_destroy(void **bag, void (*hcontrol_free)(snd_hcontrol_t *hcontrol));
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int snd_ctl_hbag_add(void **bag, snd_hcontrol_t *hcontrol);
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int snd_ctl_hbag_del(void **bag, snd_hcontrol_t *hcontrol);
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snd_hcontrol_t *snd_ctl_hbag_find(void **bag, snd_control_id_t *id);
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#ifdef __cplusplus
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}
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#endif
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