bf3782fe0bed9d205801591057dc4196defdae33
[vlc.git] / modules / control / gestures.c
1 /*****************************************************************************
2  * geatures.c: control vlc with mouse gestures
3  *****************************************************************************
4  * Copyright (C) 2002 VideoLAN
5  * $Id: gestures.c,v 1.2 2003/02/20 01:52:46 sigmunau Exp $
6  *
7  * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  * 
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <stdlib.h>                                      /* malloc(), free() */
28 #include <string.h>
29 #include <unistd.h>
30
31 #include <vlc/vlc.h>
32 #include <vlc/intf.h>
33 #include <vlc/vout.h>
34
35 #include "stream_control.h"
36 #include "input_ext-intf.h"
37
38 /*****************************************************************************
39  * intf_sys_t: description and status of interface
40  *****************************************************************************/
41 struct intf_sys_t
42 {
43     vlc_object_t *      p_vout;
44     input_thread_t *    p_input;
45     vlc_bool_t          b_got_gesture;
46     vlc_bool_t          b_button_pressed;
47     int                 i_mouse_x, i_mouse_y;
48     int                 i_last_x, i_last_y;
49     unsigned int        i_pattern;
50     int                 i_num_gestures;
51     int                 i_threshold;
52     int                 i_button_mask;
53 };
54
55 /*****************************************************************************
56  * Local prototypes.
57  *****************************************************************************/
58 #define UP 1
59 #define DOWN 2
60 #define LEFT 3
61 #define RIGHT 4
62 #define NONE 0
63 #define GESTURE( a, b, c, d ) (a | ( b << 4 ) | ( c << 8 ) | ( d << 12 ))
64
65 int  E_(Open)   ( vlc_object_t * );
66 void E_(Close)  ( vlc_object_t * );
67 static int  InitThread     ( intf_thread_t *p_intf );
68 static int  MouseEvent     ( vlc_object_t *, char const *,
69                              vlc_value_t, vlc_value_t, void * );
70
71 /* Exported functions */
72 static void RunIntf        ( intf_thread_t *p_intf );
73
74 /*****************************************************************************
75  * Module descriptor
76  *****************************************************************************/
77 #define THRESHOLD_TEXT N_( "Motion threshold" )
78 #define THRESHOLD_LONGTEXT N_( \
79     "the amount of movement required for a mouse" \
80     " gesture to be recorded" )
81
82 #define BUTTON_TEXT N_( "Mouse button" )
83 #define BUTTON_LONGTEXT N_( \
84     "the mouse button to be held down during mouse gestures" )
85
86 static char *button_list[] = { "left", "middle", "right", NULL };
87
88 vlc_module_begin();
89     add_category_hint( N_( "Gestures" ), NULL, VLC_FALSE );
90     add_integer( "gestures-threshold", 30, NULL, THRESHOLD_TEXT, THRESHOLD_LONGTEXT, VLC_TRUE );
91     add_string_from_list( "gestures-button", "right", button_list, NULL,
92                           BUTTON_TEXT, BUTTON_LONGTEXT, VLC_FALSE );
93     set_description( _("mouse gestures control module") );
94
95     set_capability( "interface", 0 );
96     set_callbacks( E_(Open), E_(Close) );
97 vlc_module_end();
98
99 /*****************************************************************************
100  * OpenIntf: initialize interface
101  *****************************************************************************/
102 int E_(Open) ( vlc_object_t *p_this )
103 {
104     intf_thread_t *p_intf = (intf_thread_t *)p_this;
105
106     /* Allocate instance and initialize some members */
107     p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
108     if( p_intf->p_sys == NULL )
109     {
110         return( 1 );
111     };
112
113     p_intf->pf_run = RunIntf;
114
115     return( 0 );
116 }
117
118 /*****************************************************************************
119  * gesture: return a subpattern within a pattern
120  *****************************************************************************/
121 static int gesture( int i_pattern, int i_num )
122 {
123     return ( i_pattern >> ( i_num * 4 ) ) & 0xF;
124 }
125         
126 /*****************************************************************************
127  * CloseIntf: destroy dummy interface
128  *****************************************************************************/
129 void E_(Close) ( vlc_object_t *p_this )
130 {
131     intf_thread_t *p_intf = (intf_thread_t *)p_this;
132
133     /* Destroy structure */
134     free( p_intf->p_sys );
135 }
136
137
138 /*****************************************************************************
139  * RunIntf: main loop
140  *****************************************************************************/
141 static void RunIntf( intf_thread_t *p_intf )
142 {
143     playlist_t * p_playlist = NULL;
144     p_intf->p_sys->p_vout = NULL;
145
146     if( InitThread( p_intf ) < 0 )
147     {
148         msg_Err( p_intf, "can't initialize intf" );
149         return;
150     }
151     msg_Dbg( p_intf, "intf initialized" );
152
153     /* Main loop */
154     while( !p_intf->b_die )
155     {
156         vlc_mutex_lock( &p_intf->change_lock );
157
158         /* 
159          * mouse cursor
160          */
161         if( p_intf->p_sys->b_got_gesture )
162         {
163             /* Do something */
164             switch( p_intf->p_sys->i_pattern )
165             {
166             case LEFT:
167                 p_playlist = vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
168                                               FIND_ANYWHERE );
169                 if( p_playlist == NULL )
170                 {
171                     break;
172                 }
173                 
174                 playlist_Prev( p_playlist );
175                 vlc_object_release( p_playlist );
176                 break;
177             case RIGHT:
178                 p_playlist = vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
179                                               FIND_ANYWHERE );
180                 if( p_playlist == NULL )
181                 {
182                     break;
183                 }
184                 
185                 playlist_Next( p_playlist );
186                 vlc_object_release( p_playlist );
187                 break;
188
189             case DOWN:
190                 if (p_intf->p_sys->p_vout
191                     && ((vout_thread_t *)p_intf->p_sys->p_vout)->b_fullscreen )
192                 {
193                     ((vout_thread_t *)p_intf->p_sys->p_vout)->i_changes |= VOUT_FULLSCREEN_CHANGE;
194                 }
195                 break;
196             case GESTURE(DOWN,LEFT,UP,RIGHT):
197                 msg_Dbg(p_intf, "A square!" );
198                 break;
199             default:
200                 break;
201             }
202             p_intf->p_sys->i_num_gestures = 0;
203             p_intf->p_sys->i_pattern = 0;
204             p_intf->p_sys->b_got_gesture = VLC_FALSE;
205         }
206                 
207
208         vlc_mutex_unlock( &p_intf->change_lock );
209
210         /* 
211          * video output
212          */
213         if( p_intf->p_sys->p_vout && p_intf->p_sys->p_vout->b_die )
214         {
215             var_DelCallback( p_intf->p_sys->p_vout, "mouse-moved",
216                              MouseEvent, p_intf );
217             var_DelCallback( p_intf->p_sys->p_vout, "mouse-button-down",
218                              MouseEvent, p_intf );
219             vlc_object_release( p_intf->p_sys->p_vout );
220             p_intf->p_sys->p_vout = NULL;
221         }
222
223         if( p_intf->p_sys->p_vout == NULL )
224         {
225             p_intf->p_sys->p_vout = vlc_object_find( p_intf,
226                                       VLC_OBJECT_VOUT, FIND_ANYWHERE );
227             if( p_intf->p_sys->p_vout )
228             {
229                 var_AddCallback( p_intf->p_sys->p_vout, "mouse-moved",
230                                  MouseEvent, p_intf );
231                 var_AddCallback( p_intf->p_sys->p_vout, "mouse-button-down",
232                                  MouseEvent, p_intf );
233             }
234         }
235
236         /* Wait a bit */
237         msleep( INTF_IDLE_SLEEP );
238     }
239
240     if( p_intf->p_sys->p_vout )
241     {
242         var_DelCallback( p_intf->p_sys->p_vout, "mouse-moved",
243                          MouseEvent, p_intf );
244         var_DelCallback( p_intf->p_sys->p_vout, "mouse-button-down",
245                          MouseEvent, p_intf );
246         vlc_object_release( p_intf->p_sys->p_vout );
247     }
248 }
249
250 /*****************************************************************************
251  * InitThread:
252  *****************************************************************************/
253 static int InitThread( intf_thread_t * p_intf )
254 {
255     char *psz_button;
256     /* we might need some locking here */
257     if( !p_intf->b_die )
258     {
259         input_thread_t * p_input;
260
261         p_input = vlc_object_find( p_intf, VLC_OBJECT_INPUT, FIND_PARENT );
262
263         vlc_mutex_lock( &p_intf->change_lock );
264
265         p_intf->p_sys->p_input = p_input;
266         p_intf->p_sys->b_got_gesture = VLC_FALSE;
267         p_intf->p_sys->b_button_pressed = VLC_FALSE;
268         p_intf->p_sys->i_threshold = config_GetInt( p_intf, "gestures-threshold" );
269         psz_button = config_GetPsz( p_intf, "gestures-button" );
270         if ( !strcmp( psz_button, "left" ) )
271         {
272             p_intf->p_sys->i_button_mask = 1;
273         }
274         else if ( !strcmp( psz_button, "middle" ) )
275         {
276             p_intf->p_sys->i_button_mask = 2;
277         }
278         else if ( !strcmp( psz_button, "right" ) )
279         {
280             p_intf->p_sys->i_button_mask = 4;
281         }
282
283         p_intf->p_sys->i_pattern = 0;
284         p_intf->p_sys->i_num_gestures = 0;
285         vlc_mutex_unlock( &p_intf->change_lock );
286
287         return 0;
288     }
289     else
290     {
291         return -1;
292     }
293 }
294
295 /*****************************************************************************
296  * MouseEvent: callback for mouse events
297  *****************************************************************************/
298 static int MouseEvent( vlc_object_t *p_this, char const *psz_var,
299                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
300 {
301     vlc_value_t val;
302     int pattern = 0;
303     
304     signed int i_horizontal, i_vertical;
305     intf_thread_t *p_intf = (intf_thread_t *)p_data;
306
307     /* don't process new gestures before the last events are processed */
308     if( p_intf->p_sys->b_got_gesture ) {
309         return VLC_SUCCESS;
310     }
311
312     vlc_mutex_lock( &p_intf->change_lock );
313     if( !strcmp(psz_var, "mouse-moved" ) && p_intf->p_sys->b_button_pressed ) {
314         var_Get( p_intf->p_sys->p_vout, "mouse-x", &val );
315         p_intf->p_sys->i_mouse_x = val.i_int;
316         var_Get( p_intf->p_sys->p_vout, "mouse-y", &val );
317         p_intf->p_sys->i_mouse_y = val.i_int;
318         i_horizontal = p_intf->p_sys->i_mouse_x -
319             p_intf->p_sys->i_last_x;
320         i_horizontal = i_horizontal / p_intf->p_sys->i_threshold;
321         i_vertical = p_intf->p_sys->i_mouse_y
322             - p_intf->p_sys->i_last_y;
323         i_vertical = i_vertical / p_intf->p_sys->i_threshold;
324         
325         if ( i_horizontal < 0 )
326         {
327             msg_Dbg( p_intf, "left gesture(%d)", i_horizontal );
328             pattern = LEFT;
329         }
330         else if ( i_horizontal > 0 )
331         {
332             msg_Dbg( p_intf, "right gesture(%d)", i_horizontal );
333             pattern = RIGHT;
334         }
335         if ( i_vertical < 0 )
336         {
337             msg_Dbg( p_intf, "up gesture(%d)", i_vertical );
338             pattern = UP;
339         }
340         else if ( i_vertical > 0 )
341         {
342             msg_Dbg( p_intf, "down gesture(%d)", i_vertical );
343             pattern = DOWN;
344         }
345         if (pattern )
346         {
347             p_intf->p_sys->i_last_y = p_intf->p_sys->i_mouse_y;
348             p_intf->p_sys->i_last_x = p_intf->p_sys->i_mouse_x;
349             if( gesture(p_intf->p_sys->i_pattern, p_intf->p_sys->i_num_gestures - 1 ) != pattern )
350             {
351                 p_intf->p_sys->i_pattern |= pattern << ( p_intf->p_sys->i_num_gestures * 4 );
352                 p_intf->p_sys->i_num_gestures++;
353             }
354         }
355
356     }
357     if( !strcmp( psz_var, "mouse-button-down" ) && newval.i_int & p_intf->p_sys->i_button_mask
358         && !p_intf->p_sys->b_button_pressed )
359     {
360         p_intf->p_sys->b_button_pressed = VLC_TRUE;
361         var_Get( p_intf->p_sys->p_vout, "mouse-x", &val );
362         p_intf->p_sys->i_last_x = val.i_int;
363         var_Get( p_intf->p_sys->p_vout, "mouse-y", &val );
364         p_intf->p_sys->i_last_y = val.i_int;
365     }
366     if( !strcmp( psz_var, "mouse-button-down" ) && !( newval.i_int & p_intf->p_sys->i_button_mask )
367         && p_intf->p_sys->b_button_pressed )
368     {
369         p_intf->p_sys->b_button_pressed = VLC_FALSE;
370         p_intf->p_sys->b_got_gesture = VLC_TRUE;
371     }
372
373     vlc_mutex_unlock( &p_intf->change_lock );
374
375     return VLC_SUCCESS;
376 }