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 <math.h>
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_interface.h>
  38 #include <vlc_vout.h>
  39
  40 #ifdef HAVE_UNISTD_H
  41 #    include <unistd.h>
  42 #endif
  43
  44 #ifdef __APPLE__
  45 #include "unimotion.h"
  46 #endif
  47
  48 /*****************************************************************************
  49  * intf_sys_t: description and status of interface
  50  *****************************************************************************/
  51 struct intf_sys_t
  52 {
  53     enum { NO_SENSOR, HDAPS_SENSOR, AMS_SENSOR, APPLESMC_SENSOR,
  54            UNIMOTION_SENSOR } sensor;
  55 #ifdef __APPLE__
  56     enum sms_hardware unimotion_hw;
  57 #endif
  58     int i_calibrate;
  59
  60     bool b_use_rotate;
  61 };
  62
  63 /*****************************************************************************
  64  * Local prototypes.
  65  *****************************************************************************/
  66 static int  Open   ( vlc_object_t * );
  67 static void Close  ( vlc_object_t * );
  68
  69 static void RunIntf( intf_thread_t *p_intf );
  70 static int GetOrientation( intf_thread_t *p_intf );
  71
  72 #define USE_ROTATE_TEXT N_("Use the rotate video filter instead of transform")
  73
  74 /*****************************************************************************
  75  * Module descriptor
  76  *****************************************************************************/
  77 vlc_module_begin ()
  78     set_shortname( N_("motion"))
  79     set_category( CAT_INTERFACE )
  80     set_subcategory( SUBCAT_INTERFACE_CONTROL )
  81     set_description( N_("motion control interface") )
  82     set_help( N_("Use HDAPS, AMS, APPLESMC or UNIMOTION motion sensors " \
  83                  "to rotate the video") )
  84
  85     add_bool( "motion-use-rotate", false, NULL,
  86               USE_ROTATE_TEXT, USE_ROTATE_TEXT, false )
  87
  88     set_capability( "interface", 0 )
  89     set_callbacks( Open, Close )
  90 vlc_module_end ()
  91
  92 /*****************************************************************************
  93  * OpenIntf: initialise interface
  94  *****************************************************************************/
  95 int Open ( vlc_object_t *p_this )
  96 {
  97     intf_thread_t *p_intf = (intf_thread_t *)p_this;
  98     FILE *f;
  99     int i_x, i_y;
 100
 101     p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
 102     if( p_intf->p_sys == NULL )
 103     {
 104         return VLC_ENOMEM;
 105     }
 106
 107     if( access( "/sys/devices/platform/hdaps/position", R_OK ) == 0 )
 108     {
 109         /* IBM HDAPS support */
 110         f = fopen( "/sys/devices/platform/hdaps/calibrate", "r" );
 111         if( f )
 112         {
 113             i_x = i_y = 0;
 114             fscanf( f, "(%d,%d)", &i_x, &i_y );
 115             fclose( f );
 116             p_intf->p_sys->i_calibrate = i_x;
 117             p_intf->p_sys->sensor = HDAPS_SENSOR;
 118         }
 119         else
 120         {
 121             p_intf->p_sys->sensor = NO_SENSOR;
 122         }
 123     }
 124     else if( access( "/sys/devices/ams/x", R_OK ) == 0 )
 125     {
 126         /* Apple Motion Sensor support */
 127         p_intf->p_sys->sensor = AMS_SENSOR;
 128     }
 129     else if( access( "/sys/devices/applesmc.768/position", R_OK ) == 0 )
 130     {
 131         /* Apple SMC (newer macbooks) */
 132         /* Should be factorised with HDAPS */
 133         f = fopen( "/sys/devices/applesmc.768/calibrate", "r" );
 134         if( f )
 135         {
 136             i_x = i_y = 0;
 137             fscanf( f, "(%d,%d)", &i_x, &i_y );
 138             fclose( f );
 139             p_intf->p_sys->i_calibrate = i_x;
 140             p_intf->p_sys->sensor = APPLESMC_SENSOR;
 141         }
 142         else
 143         {
 144             p_intf->p_sys->sensor = NO_SENSOR;
 145         }
 146     }
 147 #ifdef __APPLE__
 148     else if((p_intf->p_sys->unimotion_hw = detect_sms()))
 149         p_intf->p_sys->sensor = UNIMOTION_SENSOR;
 150 #endif
 151     else
 152     {
 153         /* No motion sensor support */
 154         p_intf->p_sys->sensor = NO_SENSOR;
 155     }
 156
 157     p_intf->pf_run = RunIntf;
 158
 159     p_intf->p_sys->b_use_rotate =
 160         var_InheritBool( p_intf, "motion-use-rotate" );
 161
 162     return VLC_SUCCESS;
 163 }
 164
 165 /*****************************************************************************
 166  * CloseIntf: destroy interface
 167  *****************************************************************************/
 168 void Close ( vlc_object_t *p_this )
 169 {
 170     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 171
 172     free( p_intf->p_sys );
 173 }
 174
 175 /*****************************************************************************
 176  * RunIntf: main loop
 177  *****************************************************************************/
 178 #define FILTER_LENGTH 16
 179 #define LOW_THRESHOLD 800
 180 #define HIGH_THRESHOLD 1000
 181 static void RunIntf( intf_thread_t *p_intf )
 182 {
 183     int i_x, i_oldx = 0, i_sum = 0, i = 0;
 184     int p_oldx[FILTER_LENGTH];
 185     memset( p_oldx, 0, FILTER_LENGTH * sizeof( int ) );
 186
 187     for( ;; )
 188     {
 189         vout_thread_t *p_vout;
 190         const char *psz_filter, *psz_type;
 191         bool b_change = false;
 192
 193         /* Wait a bit, get orientation, change filter if necessary */
 194         msleep( INTF_IDLE_SLEEP );
 195
 196         int canc = vlc_savecancel();
 197         i_x = GetOrientation( p_intf );
 198         i_sum += i_x - p_oldx[i];
 199         p_oldx[i++] = i_x;
 200         if( i == FILTER_LENGTH ) i = 0;
 201         i_x = i_sum / FILTER_LENGTH;
 202
 203         if( p_intf->p_sys->b_use_rotate )
 204         {
 205             if( i_oldx != i_x )
 206             {
 207                 /* TODO: cache object pointer */
 208                 vlc_object_t *p_obj =
 209                 vlc_object_find_name( p_intf->p_libvlc, "rotate", FIND_CHILD );
 210                 if( p_obj )
 211                 {
 212                     var_SetInteger( p_obj, "rotate-deciangle",
 213                             ((3600+i_x/2)%3600) );
 214                     i_oldx = i_x;
 215                     vlc_object_release( p_obj );
 216                 }
 217             }
 218             goto loop;
 219         }
 220
 221         if( i_x < -HIGH_THRESHOLD && i_oldx > -LOW_THRESHOLD )
 222         {
 223             b_change = true;
 224             psz_filter = "transform";
 225             psz_type = "270";
 226         }
 227         else if( ( i_x > -LOW_THRESHOLD && i_oldx < -HIGH_THRESHOLD )
 228                  || ( i_x < LOW_THRESHOLD && i_oldx > HIGH_THRESHOLD ) )
 229         {
 230             b_change = true;
 231             psz_filter = "";
 232             psz_type = "";
 233         }
 234         else if( i_x > HIGH_THRESHOLD && i_oldx < LOW_THRESHOLD )
 235         {
 236             b_change = true;
 237             psz_filter = "transform";
 238             psz_type = "90";
 239         }
 240
 241         if( b_change )
 242         {
 243             p_vout = (vout_thread_t *)
 244                 vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 245             if( p_vout )
 246             {
 247                 config_PutPsz( p_vout, "transform-type", psz_type );
 248                 var_SetString( p_vout, "vout-filter", psz_filter );
 249                 vlc_object_release( p_vout );
 250
 251                 i_oldx = i_x;
 252             }
 253         }
 254 loop:
 255         vlc_restorecancel( canc );
 256     }
 257 }
 258 #undef FILTER_LENGTH
 259 #undef LOW_THRESHOLD
 260 #undef HIGH_THRESHOLD
 261
 262 /*****************************************************************************
 263  * GetOrientation: get laptop orientation, range -1800 / +1800
 264  *****************************************************************************/
 265 static int GetOrientation( intf_thread_t *p_intf )
 266 {
 267     FILE *f;
 268     int i_x, i_y, i_z = 0;
 269
 270     switch( p_intf->p_sys->sensor )
 271     {
 272     case HDAPS_SENSOR:
 273         f = fopen( "/sys/devices/platform/hdaps/position", "r" );
 274         if( !f )
 275         {
 276             return 0;
 277         }
 278
 279         i_x = i_y = 0;
 280         fscanf( f, "(%d,%d)", &i_x, &i_y );
 281         fclose( f );
 282
 283         return ( i_x - p_intf->p_sys->i_calibrate ) * 10;
 284
 285     case AMS_SENSOR:
 286         f = fopen( "/sys/devices/ams/x", "r" );
 287         if( !f )
 288         {
 289             return 0;
 290         }
 291
 292         fscanf( f, "%d", &i_x);
 293         fclose( f );
 294
 295         return - i_x * 30; /* FIXME: arbitrary */
 296
 297     case APPLESMC_SENSOR:
 298         f = fopen( "/sys/devices/applesmc.768/position", "r" );
 299         if( !f )
 300         {
 301             return 0;
 302         }
 303
 304         i_x = i_y = i_z = 0;
 305         fscanf( f, "(%d,%d,%d)", &i_x, &i_y, &i_z );
 306         fclose( f );
 307
 308         return ( i_x - p_intf->p_sys->i_calibrate ) * 10;
 309
 310 #ifdef __APPLE__
 311     case UNIMOTION_SENSOR:
 312         if( read_sms_raw( p_intf->p_sys->unimotion_hw, &i_x, &i_y, &i_z ) )
 313         {
 314             double d_norm = sqrt( i_x*i_x+i_z*i_z );
 315             if( d_norm < 100 )
 316                 return 0;
 317             double d_x = i_x / d_norm;
 318             if( i_z > 0 )
 319                 return -asin(d_x)*3600/3.141;
 320             else
 321                 return 3600 + asin(d_x)*3600/3.141;
 322         }
 323         else
 324             return 0;
 325 #endif
 326     default:
 327         return 0;
 328     }
 329 }
 330