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 - 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 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30 #include <math.h>
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc_interface.h>
  34 #include <vlc_vout.h>
  35
  36 #ifdef HAVE_UNISTD_H
  37 #    include <unistd.h>
  38 #endif
  39
  40 #ifdef __APPLE__
  41 #include "unimotion.h"
  42 #endif
  43
  44 /*****************************************************************************
  45  * intf_sys_t: description and status of interface
  46  *****************************************************************************/
  47 struct intf_sys_t
  48 {
  49     enum { NO_SENSOR, HDAPS_SENSOR, AMS_SENSOR, UNIMOTION_SENSOR } sensor;
  50     enum sms_hardware unimotion_hw;
  51
  52     int i_calibrate;
  53
  54     vlc_bool_t b_use_rotate;
  55 };
  56
  57 /*****************************************************************************
  58  * Local prototypes.
  59  *****************************************************************************/
  60 static int  Open   ( vlc_object_t * );
  61 static void Close  ( vlc_object_t * );
  62
  63 static void RunIntf( intf_thread_t *p_intf );
  64 static int GetOrientation( intf_thread_t *p_intf );
  65
  66 #define USE_ROTATE_TEXT N_("Use the rotate video filter instead of transform")
  67
  68 /*****************************************************************************
  69  * Module descriptor
  70  *****************************************************************************/
  71 vlc_module_begin();
  72     set_shortname( _("motion"));
  73     set_category( CAT_INTERFACE );
  74     set_description( _("motion control interface") );
  75
  76     add_bool( "motion-use-rotate", 0, NULL,
  77               USE_ROTATE_TEXT, USE_ROTATE_TEXT, VLC_FALSE );
  78
  79     set_capability( "interface", 0 );
  80     set_callbacks( Open, Close );
  81 vlc_module_end();
  82
  83 /*****************************************************************************
  84  * OpenIntf: initialise interface
  85  *****************************************************************************/
  86 int Open ( vlc_object_t *p_this )
  87 {
  88     intf_thread_t *p_intf = (intf_thread_t *)p_this;
  89     FILE *f;
  90     int i_x, i_y;
  91
  92     p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
  93     if( p_intf->p_sys == NULL )
  94     {
  95         return VLC_ENOMEM;
  96     }
  97
  98     if( access( "/sys/devices/platform/hdaps/position", R_OK ) == 0 )
  99     {
 100         /* IBM HDAPS support */
 101         f = fopen( "/sys/devices/platform/hdaps/calibrate", "r" );
 102         if( f )
 103         {
 104             i_x = i_y = 0;
 105             fscanf( f, "(%d,%d)", &i_x, &i_y );
 106             fclose( f );
 107             p_intf->p_sys->i_calibrate = i_x;
 108             p_intf->p_sys->sensor = HDAPS_SENSOR;
 109         }
 110         else
 111         {
 112             p_intf->p_sys->sensor = NO_SENSOR;
 113         }
 114     }
 115     else if( access( "/sys/devices/ams/x", R_OK ) == 0 )
 116     {
 117         /* Apple Motion Sensor support */
 118         p_intf->p_sys->sensor = AMS_SENSOR;
 119     }
 120 #ifdef __APPLE__
 121     else if( p_intf->p_sys->unimotion_hw = detect_sms() )
 122         p_intf->p_sys->sensor = UNIMOTION_SENSOR;
 123 #endif
 124     else
 125     {
 126         /* No motion sensor support */
 127         p_intf->p_sys->sensor = NO_SENSOR;
 128     }
 129
 130     p_intf->pf_run = RunIntf;
 131
 132     p_intf->p_sys->b_use_rotate = config_GetInt( p_intf, "motion-use-rotate" );
 133
 134     return VLC_SUCCESS;
 135 }
 136
 137 /*****************************************************************************
 138  * CloseIntf: destroy interface
 139  *****************************************************************************/
 140 void Close ( vlc_object_t *p_this )
 141 {
 142     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 143
 144     free( p_intf->p_sys );
 145 }
 146
 147 /*****************************************************************************
 148  * RunIntf: main loop
 149  *****************************************************************************/
 150 #define FILTER_LENGTH 16
 151 #define LOW_THRESHOLD 800
 152 #define HIGH_THRESHOLD 1000
 153 static void RunIntf( intf_thread_t *p_intf )
 154 {
 155     int i_x, i_oldx = 0, i_sum = 0, i = 0;
 156     int p_oldx[FILTER_LENGTH];
 157     memset( p_oldx, 0, FILTER_LENGTH * sizeof( int ) );
 158
 159     while( !intf_ShouldDie( p_intf ) )
 160     {
 161         vout_thread_t *p_vout;
 162         const char *psz_filter, *psz_type;
 163         vlc_bool_t b_change = VLC_FALSE;
 164
 165         /* Wait a bit, get orientation, change filter if necessary */
 166         msleep( INTF_IDLE_SLEEP );
 167
 168         i_x = GetOrientation( p_intf );
 169         i_sum += i_x - p_oldx[i];
 170         p_oldx[i++] = i_x;
 171         if( i == FILTER_LENGTH ) i = 0;
 172         i_x = i_sum / FILTER_LENGTH;
 173
 174         if( p_intf->p_sys->b_use_rotate )
 175         {
 176             if( i_oldx != i_x )
 177             {
 178                 /* TODO: cache object pointer */
 179                 vlc_object_t *p_obj =
 180                 vlc_object_find_name( p_intf->p_libvlc, "rotate", FIND_CHILD );
 181                 if( p_obj )
 182                 {
 183                     var_SetInteger( p_obj, "rotate-deciangle",
 184                             ((3600+i_x/2)%3600) );
 185                     i_oldx = i_x;
 186                     vlc_object_release( p_obj );
 187                 }
 188             }
 189             continue;
 190         }
 191
 192         if( i_x < -HIGH_THRESHOLD && i_oldx > -LOW_THRESHOLD )
 193         {
 194             b_change = VLC_TRUE;
 195             psz_filter = "transform";
 196             psz_type = "270";
 197         }
 198         else if( ( i_x > -LOW_THRESHOLD && i_oldx < -HIGH_THRESHOLD )
 199                  || ( i_x < LOW_THRESHOLD && i_oldx > HIGH_THRESHOLD ) )
 200         {
 201             b_change = VLC_TRUE;
 202             psz_filter = "";
 203             psz_type = "";
 204         }
 205         else if( i_x > HIGH_THRESHOLD && i_oldx < LOW_THRESHOLD )
 206         {
 207             b_change = VLC_TRUE;
 208             psz_filter = "transform";
 209             psz_type = "90";
 210         }
 211
 212         if( !b_change )
 213         {
 214             continue;
 215         }
 216
 217         p_vout = (vout_thread_t *)
 218             vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 219         if( !p_vout )
 220         {
 221             continue;
 222         }
 223
 224         config_PutPsz( p_vout, "transform-type", psz_type );
 225         var_SetString( p_vout, "vout-filter", psz_filter );
 226         vlc_object_release( p_vout );
 227
 228         i_oldx = i_x;
 229     }
 230 }
 231 #undef FILTER_LENGTH
 232 #undef LOW_THRESHOLD
 233 #undef HIGH_THRESHOLD
 234
 235 /*****************************************************************************
 236  * GetOrientation: get laptop orientation, range -1800 / +1800
 237  *****************************************************************************/
 238 static int GetOrientation( intf_thread_t *p_intf )
 239 {
 240     FILE *f;
 241     int i_x, i_y, i_z;
 242
 243     switch( p_intf->p_sys->sensor )
 244     {
 245     case HDAPS_SENSOR:
 246         f = fopen( "/sys/devices/platform/hdaps/position", "r" );
 247         if( !f )
 248         {
 249             return 0;
 250         }
 251
 252         i_x = i_y = 0;
 253         fscanf( f, "(%d,%d)", &i_x, &i_y );
 254         fclose( f );
 255
 256         return ( i_x - p_intf->p_sys->i_calibrate ) * 10;
 257
 258     case AMS_SENSOR:
 259         f = fopen( "/sys/devices/ams/x", "r" );
 260         if( !f )
 261         {
 262             return 0;
 263         }
 264
 265         fscanf( f, "%d", &i_x);
 266         fclose( f );
 267
 268         return - i_x * 30; /* FIXME: arbitrary */
 269 #ifdef __APPLE__
 270     case UNIMOTION_SENSOR:
 271         if( read_sms_raw( p_intf->p_sys->unimotion_hw, &i_x, &i_y, &i_z ) )
 272         {
 273             double d_norm = sqrt( i_x*i_x+i_z*i_z );
 274             if( d_norm < 100 )
 275                 return 0;
 276             double d_x = i_x / d_norm;
 277             if( i_z > 0 )
 278                 return -asin(d_x)*3600/3.141;
 279             else
 280                 return 3600 + asin(d_x)*3600/3.141;
 281         }
 282 #endif
 283         else
 284             return 0;
 285     default:
 286         return 0;
 287     }
 288 }
 289