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