modules/control/motion.c

   1 /*****************************************************************************
   2  * motion.c: control VLC with laptop built-in motion sensors
   3  *****************************************************************************
   4  * Copyright (C) 2006 - 2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Sam Hocevar <sam@zoy.org>
   8  *         Jérôme Decoodt <djc@videolan.org> (unimotion integration)
   9  *
  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.
  14  *
  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.
  19  *
  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  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <assert.h>
  34 #include <unistd.h>
  35
  36 #define VLC_MODULE_LICENSE VLC_LICENSE_GPL_2_PLUS
  37 #include <vlc_common.h>
  38 #include <vlc_plugin.h>
  39 #include <vlc_interface.h>
  40 #include <vlc_playlist.h>
  41 #include <vlc_input.h>
  42 #include <vlc_vout.h>
  43
  44 #include "motionlib.h"
  45
  46 /*****************************************************************************
  47  * intf_sys_t: description and status of interface
  48  *****************************************************************************/
  49 struct intf_sys_t
  50 {
  51     motion_sensors_t *p_motion;
  52     vlc_thread_t thread;
  53 };
  54
  55 /*****************************************************************************
  56  * Local prototypes.
  57  *****************************************************************************/
  58 static int  Open   ( vlc_object_t * );
  59 static void Close  ( vlc_object_t * );
  60
  61 static void *RunIntf( void * );
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin ()
  67     set_shortname( N_("motion"))
  68     set_category( CAT_INTERFACE )
  69     set_subcategory( SUBCAT_INTERFACE_CONTROL )
  70     set_description( N_("motion control interface") )
  71     set_help( N_("Use HDAPS, AMS, APPLESMC or UNIMOTION motion sensors " \
  72                  "to rotate the video") )
  73
  74     add_obsolete_bool( "motion-use-rotate" ) /* since 2.1.0 */
  75
  76     set_capability( "interface", 0 )
  77     set_callbacks( Open, Close )
  78 vlc_module_end ()
  79
  80 /*****************************************************************************
  81  * OpenIntf: initialise interface
  82  *****************************************************************************/
  83 static int Open ( vlc_object_t *p_this )
  84 {
  85     intf_thread_t *p_intf = (intf_thread_t *)p_this;
  86     intf_sys_t *p_sys = malloc( sizeof( *p_sys ) );
  87     if( unlikely(p_sys == NULL) )
  88         return VLC_ENOMEM;
  89
  90     p_sys->p_motion = motion_create( VLC_OBJECT( p_intf ) );
  91     if( p_sys->p_motion == NULL )
  92     {
  93 error:
  94         free( p_sys );
  95         return VLC_EGENERIC;
  96     }
  97
  98     p_intf->p_sys = p_sys;
  99
 100     if( vlc_clone( &p_sys->thread, RunIntf, p_intf, VLC_THREAD_PRIORITY_LOW ) )
 101     {
 102         motion_destroy( p_sys->p_motion );
 103         goto error;
 104     }
 105
 106     return VLC_SUCCESS;
 107 }
 108
 109 /*****************************************************************************
 110  * CloseIntf: destroy interface
 111  *****************************************************************************/
 112 static void Close ( vlc_object_t *p_this )
 113 {
 114     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 115     intf_sys_t *p_sys = p_intf->p_sys;
 116
 117     vlc_cancel( p_sys->thread );
 118     vlc_join( p_sys->thread, NULL );
 119     motion_destroy( p_sys->p_motion );
 120     free( p_sys );
 121 }
 122
 123 /*****************************************************************************
 124  * RunIntf: main loop
 125  *****************************************************************************/
 126 #define LOW_THRESHOLD 800
 127 #define HIGH_THRESHOLD 1000
 128 static void *RunIntf( void *data )
 129 {
 130     intf_thread_t *p_intf = data;
 131     int i_oldx = 0;
 132
 133     for( ;; )
 134     {
 135         const char *psz_type;
 136         bool b_change = false;
 137
 138         /* Wait a bit, get orientation, change filter if necessary */
 139 #warning FIXME: check once (or less) per picture, not once per interval
 140         msleep( INTF_IDLE_SLEEP );
 141
 142         int canc = vlc_savecancel();
 143         int i_x = motion_get_angle( p_intf->p_sys->p_motion );
 144
 145         if( i_x < -HIGH_THRESHOLD && i_oldx > -LOW_THRESHOLD )
 146         {
 147             b_change = true;
 148             psz_type = "90";
 149         }
 150         else if( ( i_x > -LOW_THRESHOLD && i_oldx < -HIGH_THRESHOLD )
 151                  || ( i_x < LOW_THRESHOLD && i_oldx > HIGH_THRESHOLD ) )
 152         {
 153             b_change = true;
 154             psz_type = NULL;
 155         }
 156         else if( i_x > HIGH_THRESHOLD && i_oldx < LOW_THRESHOLD )
 157         {
 158             b_change = true;
 159             psz_type = "270";
 160         }
 161
 162         if( b_change )
 163         {
 164 #warning FIXME: refactor this plugin as a video filter!
 165             input_thread_t *p_input = pl_CurrentInput( p_intf );
 166             if( p_input )
 167             {
 168                 vout_thread_t *p_vout;
 169
 170                 p_vout = input_GetVout( p_input );
 171                 if( p_vout )
 172                 {
 173                     if( psz_type != NULL )
 174                     {
 175                         var_Create( p_vout, "transform-type", VLC_VAR_STRING );
 176                         var_SetString( p_vout, "transform-type", psz_type );
 177                     }
 178                     else
 179                         var_Destroy( p_vout, "transform-type" );
 180
 181                     var_SetString( p_vout, "video-filter",
 182                                    psz_type != NULL ? "transform" : "" );
 183                     vlc_object_release( p_vout );
 184                 }
 185                 vlc_object_release( p_input );
 186                 i_oldx = i_x;
 187             }
 188         }
 189
 190         vlc_restorecancel( canc );
 191     }
 192     vlc_assert_unreachable();
 193 }
 194 #undef LOW_THRESHOLD
 195 #undef HIGH_THRESHOLD