git.sesse.net Git - vlc/blob - modules/control/motion.c

   1 /*****************************************************************************
   2  * motion.c: control VLC with laptop built-in motion sensors
   3  *****************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Sam Hocevar <sam@zoy.org>
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_interface.h>
  32 #include <vlc_vout.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #    include <unistd.h>
  36 #endif
  37
  38 /*****************************************************************************
  39  * intf_sys_t: description and status of interface
  40  *****************************************************************************/
  41 struct intf_sys_t
  42 {
  43     enum { NO_SENSOR, HDAPS_SENSOR, AMS_SENSOR } sensor;
  44
  45     int i_calibrate;
  46
  47     vlc_bool_t b_use_rotate;
  48 };
  49
  50 /*****************************************************************************
  51  * Local prototypes.
  52  *****************************************************************************/
  53 static int  Open   ( vlc_object_t * );
  54 static void Close  ( vlc_object_t * );
  55
  56 static void RunIntf( intf_thread_t *p_intf );
  57 static int GetOrientation( intf_thread_t *p_intf );
  58
  59 #define USE_ROTATE_TEXT N_("Use the rotate video filter instead of transform")
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64 vlc_module_begin();
  65     set_shortname( _("motion"));
  66     set_category( CAT_INTERFACE );
  67     set_description( _("motion control interface") );
  68
  69     add_bool( "motion-use-rotate", 0, NULL,
  70               USE_ROTATE_TEXT, USE_ROTATE_TEXT, VLC_FALSE );
  71
  72     set_capability( "interface", 0 );
  73     set_callbacks( Open, Close );
  74 vlc_module_end();
  75
  76 /*****************************************************************************
  77  * OpenIntf: initialise interface
  78  *****************************************************************************/
  79 int Open ( vlc_object_t *p_this )
  80 {
  81     intf_thread_t *p_intf = (intf_thread_t *)p_this;
  82     FILE *f;
  83     int i_x, i_y;
  84
  85     p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
  86     if( p_intf->p_sys == NULL )
  87     {
  88         return VLC_ENOMEM;
  89     }
  90
  91     if( access( "/sys/devices/platform/hdaps/position", R_OK ) == 0 )
  92     {
  93         /* IBM HDAPS support */
  94         f = fopen( "/sys/devices/platform/hdaps/calibrate", "r" );
  95         if( f )
  96         {
  97             i_x = i_y = 0;
  98             fscanf( f, "(%d,%d)", &i_x, &i_y );
  99             fclose( f );
 100             p_intf->p_sys->i_calibrate = i_x;
 101             p_intf->p_sys->sensor = HDAPS_SENSOR;
 102         }
 103         else
 104         {
 105             p_intf->p_sys->sensor = NO_SENSOR;
 106         }
 107     }
 108     else if( access( "/sys/devices/ams/x", R_OK ) == 0 )
 109     {
 110         /* Apple Motion Sensor support */
 111         p_intf->p_sys->sensor = AMS_SENSOR;
 112     }
 113     else
 114     {
 115         /* No motion sensor support */
 116         p_intf->p_sys->sensor = NO_SENSOR;
 117     }
 118
 119     p_intf->pf_run = RunIntf;
 120
 121     p_intf->p_sys->b_use_rotate = config_GetInt( p_intf, "motion-use-rotate" );
 122
 123     return VLC_SUCCESS;
 124 }
 125
 126 /*****************************************************************************
 127  * CloseIntf: destroy interface
 128  *****************************************************************************/
 129 void Close ( vlc_object_t *p_this )
 130 {
 131     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 132
 133     free( p_intf->p_sys );
 134 }
 135
 136 /*****************************************************************************
 137  * RunIntf: main loop
 138  *****************************************************************************/
 139 static void RunIntf( intf_thread_t *p_intf )
 140 {
 141     int i_x, i_oldx = 0;
 142
 143     while( !intf_ShouldDie( p_intf ) )
 144     {
 145 #define LOW_THRESHOLD 80
 146 #define HIGH_THRESHOLD 100
 147         vout_thread_t *p_vout;
 148         const char *psz_filter, *psz_type;
 149         vlc_bool_t b_change = VLC_FALSE;
 150
 151         /* Wait a bit, get orientation, change filter if necessary */
 152         msleep( INTF_IDLE_SLEEP );
 153
 154         i_x = GetOrientation( p_intf );
 155
 156         if( p_intf->p_sys->b_use_rotate )
 157         {
 158             if( i_oldx != i_x )
 159             {
 160                 /* TODO: cache object pointer */
 161                 vlc_object_t *p_obj =
 162                 vlc_object_find_name( p_intf->p_libvlc, "rotate", FIND_CHILD );
 163                 if( p_obj )
 164                 {
 165                     var_SetInteger( p_obj, "rotate-angle",((360+i_x/2)%360) );
 166                     i_oldx = i_x;
 167                     vlc_object_release( p_obj );
 168                 }
 169             }
 170             continue;
 171         }
 172
 173         if( i_x < -HIGH_THRESHOLD && i_oldx > -LOW_THRESHOLD )
 174         {
 175             b_change = VLC_TRUE;
 176             psz_filter = "transform";
 177             psz_type = "270";
 178         }
 179         else if( ( i_x > -LOW_THRESHOLD && i_oldx < -HIGH_THRESHOLD )
 180                  || ( i_x < LOW_THRESHOLD && i_oldx > HIGH_THRESHOLD ) )
 181         {
 182             b_change = VLC_TRUE;
 183             psz_filter = "";
 184             psz_type = "";
 185         }
 186         else if( i_x > HIGH_THRESHOLD && i_oldx < LOW_THRESHOLD )
 187         {
 188             b_change = VLC_TRUE;
 189             psz_filter = "transform";
 190             psz_type = "90";
 191         }
 192
 193         if( !b_change )
 194         {
 195             continue;
 196         }
 197
 198         p_vout = (vout_thread_t *)
 199             vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 200         if( !p_vout )
 201         {
 202             continue;
 203         }
 204
 205         config_PutPsz( p_vout, "transform-type", psz_type );
 206         var_SetString( p_vout, "vout-filter", psz_filter );
 207         vlc_object_release( p_vout );
 208
 209         i_oldx = i_x;
 210     }
 211 }
 212
 213 /*****************************************************************************
 214  * GetOrientation: get laptop orientation, range -180 / +180
 215  *****************************************************************************/
 216 static int GetOrientation( intf_thread_t *p_intf )
 217 {
 218     FILE *f;
 219     int i_x, i_y;
 220
 221     switch( p_intf->p_sys->sensor )
 222     {
 223     case HDAPS_SENSOR:
 224         f = fopen( "/sys/devices/platform/hdaps/position", "r" );
 225         if( !f )
 226         {
 227             return 0;
 228         }
 229
 230         i_x = i_y = 0;
 231         fscanf( f, "(%d,%d)", &i_x, &i_y );
 232         fclose( f );
 233
 234         return i_x - p_intf->p_sys->i_calibrate;
 235
 236     case AMS_SENSOR:
 237         f = fopen( "/sys/devices/ams/x", "r" );
 238         if( !f )
 239         {
 240             return 0;
 241         }
 242
 243         fscanf( f, "%d", &i_x);
 244         fclose( f );
 245
 246         return - i_x * 3; /* FIXME: arbitrary */
 247
 248     default:
 249         return 0;
 250     }
 251 }
 252