55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
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#ifndef __LISTENER_H__
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#define __LISTENER_H__
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enum listener_event_type
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{
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/* The player has been started, stopped or seeked */
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LISTENER_PLAYER = (1 << 0),
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/* The current playlist has been modified */
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LISTENER_PLAYLIST = (1 << 1),
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/* The volume has been changed */
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LISTENER_VOLUME = (1 << 2),
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/* A speaker has been enabled or disabled */
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LISTENER_SPEAKER = (1 << 3),
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/* Options like repeat, random has been changed */
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LISTENER_OPTIONS = (1 << 4),
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/* The library has been modified */
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LISTENER_DATABASE = (1 << 5),
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};
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typedef void (*notify)(enum listener_event_type type);
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/*
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* Registers the given callback function to the given event types.
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* This function is not thread safe. Listeners must be added once at startup.
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*
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* @param notify_cb Callback function
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* @param events Event mask, one or more of LISTENER_*
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* @return 0 on success, -1 on failure
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*/
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int
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listener_add(notify notify_cb, short events);
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/*
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* Removes the given callback function
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* This function is not thread safe. Listeners must be removed once at shutdown.
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*
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* @param notify_cb Callback function
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* @return 0 on success, -1 if the callback was not registered
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*/
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int
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listener_remove(notify notify_cb);
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/*
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* Calls the callback function of the registered listeners listening for the
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* given type of event.
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*
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* @param type The event type, on of the LISTENER_* values
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*
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*/
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void
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listener_notify(enum listener_event_type type);
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#endif /* !__LISTENER_H__ */
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