1 /*****************************************************************************
2 * event.c: New libvlc event control API
3 *****************************************************************************
4 * Copyright (C) 2007 the VideoLAN team
7 * Authors: Filippo Carone <filippo@carone.org>
8 * Pierre d'Herbemont <pdherbemont # videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 #include "libvlc_internal.h"
26 #include <vlc/libvlc.h>
27 #include <vlc_playlist.h>
34 /**************************************************************************
35 * handle_event (private)
37 * Callback from the vlc variables
38 **************************************************************************/
39 static int handle_event( vlc_object_t *p_this, char const *psz_cmd,
40 vlc_value_t oldval, vlc_value_t newval,
43 /* This is thread safe, as the var_*Callback already provide the locking
44 * facility for p_data */
45 struct libvlc_callback_entry_t *entry = p_data;
48 event.type = entry->i_event_type;
50 if (event.type == libvlc_VolumeChanged)
52 if(!strcmp(psz_cmd, "intf-change"))
54 input_thread_t * p_input = (input_thread_t *)p_this;
56 var_Get( p_input, "time", &val );
58 /* Only send event at a reasonable time precision (500ms) */
59 /* (FIXME: this should be configurable) */
60 if ((val.i_time % I64C(500000)) != 0)
62 /* Don't send this event */
66 event.u.input_position_changed.new_position = val.i_time;
69 event.u.input_position_changed.new_position = newval.i_time;
71 event.u.input_position_changed.new_position *= 1000LL;
73 else if (event.type == libvlc_InputPositionChanged)
75 event.u.volume_changed.new_volume = newval.i_int;
78 /* Call the client entry */
79 entry->f_callback( entry->p_instance, &event, entry->p_user_data );
84 /**************************************************************************
85 * get_input (private) :
87 * Utility function, Object should be released by vlc_object_release
89 **************************************************************************/
90 static input_thread_t * get_input(libvlc_instance_t * p_instance)
92 libvlc_exception_t p_e_unused; /* FIXME: error checking here */
93 libvlc_input_t * p_libvlc_input = libvlc_playlist_get_input( p_instance, &p_e_unused );
94 input_thread_t * p_input;
99 p_input = libvlc_get_input_thread( p_libvlc_input, &p_e_unused );
101 libvlc_input_free(p_libvlc_input);
106 /**************************************************************************
107 * install_input_event (private) :
109 * vlc variables callback, used to install input event.
110 * Can be called manually though.
111 **************************************************************************/
112 static int install_input_event( vlc_object_t *p_this, char const *psz_cmd,
113 vlc_value_t oldval, vlc_value_t newval,
116 libvlc_instance_t * p_instance = p_data;
117 struct libvlc_callback_entry_list_t *p_listitem;
118 input_thread_t * p_input = get_input( p_instance );
120 vlc_mutex_lock( &p_instance->instance_lock );
122 p_listitem = p_instance->p_callback_list;
124 for( ; p_listitem ; p_listitem = p_listitem->next )
126 if (p_listitem->elmt->i_event_type == libvlc_InputPositionChanged)
128 /* FIXME: here we shouldn't listen on intf-change, we have to provide
129 * in vlc core a more accurate callback */
130 var_AddCallback( p_input, "intf-change", handle_event, p_listitem->elmt );
131 var_AddCallback( p_input, "time", handle_event, p_listitem->elmt );
135 vlc_mutex_unlock( &p_instance->instance_lock );
136 vlc_object_release( p_input );
140 /**************************************************************************
141 * add_callback_to_list (private) :
143 * callback list utility function.
144 **************************************************************************/
145 static inline void add_callback_to_list( struct libvlc_callback_entry_t *entry,
146 struct libvlc_callback_entry_list_t **list )
148 struct libvlc_callback_entry_list_t *new_listitem;
150 /* malloc/free strategy:
151 * - alloc-ded in add_callback_entry
152 * - free-ed by libvlc_event_remove_callback
153 * - free-ed in libvlc_destroy threw libvlc_event_remove_callback
154 * when entry is destroyed
156 new_listitem = malloc( sizeof( struct libvlc_callback_entry_list_t ) );
157 new_listitem->elmt = entry;
158 new_listitem->next = *list;
159 new_listitem->prev = NULL;
162 (*list)->prev = new_listitem;
164 *list = new_listitem;
167 /**************************************************************************
168 * remove_variable_callback (private) :
170 * Delete the appropriate vlc variables callback for an event.
171 **************************************************************************/
172 static int remove_variable_callback( libvlc_instance_t *p_instance,
173 struct libvlc_callback_entry_t * p_entry )
175 input_thread_t * p_input = get_input( p_instance );
176 int res = VLC_SUCCESS;
178 /* Note: Appropriate lock should be held by the caller */
180 switch ( p_entry->i_event_type )
182 case libvlc_VolumeChanged:
183 res = var_DelCallback( p_instance->p_libvlc_int, "volume-change",
184 handle_event, p_entry );
186 case libvlc_InputPositionChanged:
187 /* We may not be deleting the right p_input callback, in this case this
189 var_DelCallback( p_input, "intf-change", handle_event, p_entry );
190 var_DelCallback( p_input, "position", handle_event, p_entry );
195 vlc_object_release( p_input );
201 * Internal libvlc functions
204 /**************************************************************************
205 * libvlc_event_init (internal) :
207 * initialization function.
208 **************************************************************************/
209 void libvlc_event_init( libvlc_instance_t *p_instance, libvlc_exception_t *p_e )
211 playlist_t *p_playlist = p_instance->p_libvlc_int->p_playlist;
214 RAISEVOID ("Can't listen to input event");
216 /* Install a Callback for input changes, so
217 * so we can track input event */
218 var_AddCallback( p_playlist, "playlist-current",
219 install_input_event, p_instance );
222 /**************************************************************************
223 * libvlc_event_fini (internal) :
225 * finalization function.
226 **************************************************************************/
227 void libvlc_event_fini( libvlc_instance_t *p_instance, libvlc_exception_t *p_e )
229 playlist_t *p_playlist = p_instance->p_libvlc_int->p_playlist;
230 libvlc_exception_t p_e_unused;
232 libvlc_event_remove_all_callbacks( p_instance, &p_e_unused );
235 RAISEVOID ("Can't unregister input events");
237 var_DelCallback( p_playlist, "playlist-current",
238 install_input_event, p_instance );
242 * Public libvlc functions
245 /**************************************************************************
246 * libvlc_event_add_callback (public) :
248 * Add a callback for an event.
249 **************************************************************************/
250 void libvlc_event_add_callback( libvlc_instance_t *p_instance,
251 libvlc_event_type_t i_event_type,
252 libvlc_callback_t f_callback,
254 libvlc_exception_t *p_e )
256 struct libvlc_callback_entry_t *entry;
257 vlc_value_t unused1, unused2;
258 int res = VLC_SUCCESS;
261 RAISEVOID (" Callback function is null ");
263 /* malloc/free strategy:
264 * - alloc-ded in libvlc_event_add_callback
265 * - free-ed by libvlc_event_add_callback on error
266 * - free-ed by libvlc_event_remove_callback
267 * - free-ed in libvlc_destroy threw libvlc_event_remove_callback
268 * when entry is destroyed
270 entry = malloc( sizeof( struct libvlc_callback_entry_t ) );
271 entry->f_callback = f_callback;
272 entry->i_event_type = i_event_type;
273 entry->p_user_data = user_data;
275 switch ( i_event_type )
277 case libvlc_VolumeChanged:
278 res = var_AddCallback( p_instance->p_libvlc_int, "volume-change",
279 handle_event, entry );
281 case libvlc_InputPositionChanged:
282 install_input_event( NULL, NULL, unused1, unused2, p_instance);
286 RAISEVOID( "Unsupported event." );
289 if (res != VLC_SUCCESS)
292 RAISEVOID("Internal callback registration was not successful. Callback not registered.");
295 vlc_mutex_lock( &p_instance->instance_lock );
296 add_callback_to_list( entry, &p_instance->p_callback_list );
297 vlc_mutex_unlock( &p_instance->instance_lock );
302 /**************************************************************************
303 * libvlc_event_remove_callback (public) :
305 * Remove a callback for an event.
306 **************************************************************************/
307 void libvlc_event_remove_callback( libvlc_instance_t *p_instance,
308 libvlc_event_type_t i_event_type,
309 libvlc_callback_t f_callback,
311 libvlc_exception_t *p_e )
313 struct libvlc_callback_entry_list_t *p_listitem;
315 vlc_mutex_lock( &p_instance->instance_lock );
317 p_listitem = p_instance->p_callback_list;
321 if( p_listitem->elmt->f_callback == f_callback
322 && ( p_listitem->elmt->i_event_type == i_event_type )
323 && ( p_listitem->elmt->p_user_data == p_user_data )
327 remove_variable_callback( p_instance, p_listitem->elmt ); /* FIXME: We should warn on error */
329 if( p_listitem->prev )
330 p_listitem->prev->next = p_listitem->next;
332 p_instance->p_callback_list = p_listitem->next;
335 p_listitem->next->prev = p_listitem->prev;
337 free( p_listitem->elmt );
343 p_listitem = p_listitem->next;
345 vlc_mutex_unlock( &p_instance->instance_lock );
348 /**************************************************************************
349 * libvlc_event_remove_all_callbacks (public) :
351 * Remove all callbacks for all events.
352 **************************************************************************/
353 void libvlc_event_remove_all_callbacks( libvlc_instance_t *p_instance,
354 libvlc_exception_t *p_e )
356 struct libvlc_callback_entry_list_t *p_listitem;
358 vlc_mutex_lock( &p_instance->instance_lock );
360 p_listitem = p_instance->p_callback_list;
364 remove_variable_callback( p_instance, p_listitem->elmt ); /* FIXME: We could warn on error */
365 p_listitem = p_listitem->next;
368 p_instance->p_callback_list = NULL;
370 vlc_mutex_unlock( &p_instance->instance_lock );