motion.c 8.5 KB
Newer Older
1 2 3
/*****************************************************************************
 * motion.c: control VLC with laptop built-in motion sensors
 *****************************************************************************
4
 * Copyright (C) 2006 - 2007 the VideoLAN team
5 6 7
 * $Id$
 *
 * Author: Sam Hocevar <sam@zoy.org>
8
 *         Jérôme Decoodt <djc@videolan.org> (unimotion integration)
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
28
#include <math.h>
29 30

#include <vlc/vlc.h>
Clément Stenac's avatar
Clément Stenac committed
31 32
#include <vlc_interface.h>
#include <vlc_vout.h>
33 34 35 36 37

#ifdef HAVE_UNISTD_H
#    include <unistd.h>
#endif

38 39 40 41
#ifdef __APPLE__
#include "unimotion.h"
#endif

42 43 44 45 46
/*****************************************************************************
 * intf_sys_t: description and status of interface
 *****************************************************************************/
struct intf_sys_t
{
47
    enum { NO_SENSOR, HDAPS_SENSOR, AMS_SENSOR, UNIMOTION_SENSOR } sensor;
Jérome Decoodt's avatar
Jérome Decoodt committed
48
#ifdef __APPLE__
49
    enum sms_hardware unimotion_hw;
Jérome Decoodt's avatar
Jérome Decoodt committed
50
#endif
51 52 53
    int i_calibrate;

    vlc_bool_t b_use_rotate;
54 55 56 57 58 59 60 61 62 63 64
};

/*****************************************************************************
 * Local prototypes.
 *****************************************************************************/
static int  Open   ( vlc_object_t * );
static void Close  ( vlc_object_t * );

static void RunIntf( intf_thread_t *p_intf );
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 70 71 72 73 74
/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_shortname( _("motion"));
    set_category( CAT_INTERFACE );
    set_description( _("motion control interface") );

75 76 77
    add_bool( "motion-use-rotate", 0, NULL,
              USE_ROTATE_TEXT, USE_ROTATE_TEXT, VLC_FALSE );

78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
    set_capability( "interface", 0 );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * OpenIntf: initialise interface
 *****************************************************************************/
int Open ( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t *)p_this;
    FILE *f;
    int i_x, i_y;

    p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
    if( p_intf->p_sys == NULL )
    {
        return VLC_ENOMEM;
    }

    if( access( "/sys/devices/platform/hdaps/position", R_OK ) == 0 )
    {
        /* IBM HDAPS support */
        f = fopen( "/sys/devices/platform/hdaps/calibrate", "r" );
        if( f )
        {
            i_x = i_y = 0;
            fscanf( f, "(%d,%d)", &i_x, &i_y );
            fclose( f );
            p_intf->p_sys->i_calibrate = i_x;
            p_intf->p_sys->sensor = HDAPS_SENSOR;
        }
        else
        {
            p_intf->p_sys->sensor = NO_SENSOR;
        }
    }
    else if( access( "/sys/devices/ams/x", R_OK ) == 0 )
    {
        /* Apple Motion Sensor support */
        p_intf->p_sys->sensor = AMS_SENSOR;
    }
119 120 121 122
#ifdef __APPLE__
    else if( p_intf->p_sys->unimotion_hw = detect_sms() )
        p_intf->p_sys->sensor = UNIMOTION_SENSOR;
#endif
123 124 125 126 127 128 129 130
    else
    {
        /* No motion sensor support */
        p_intf->p_sys->sensor = NO_SENSOR;
    }

    p_intf->pf_run = RunIntf;

131 132
    p_intf->p_sys->b_use_rotate = config_GetInt( p_intf, "motion-use-rotate" );

133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
    return VLC_SUCCESS;
}

/*****************************************************************************
 * CloseIntf: destroy interface
 *****************************************************************************/
void Close ( vlc_object_t *p_this )
{
    intf_thread_t *p_intf = (intf_thread_t *)p_this;

    free( p_intf->p_sys );
}

/*****************************************************************************
 * RunIntf: main loop
 *****************************************************************************/
149 150 151
#define FILTER_LENGTH 16
#define LOW_THRESHOLD 800
#define HIGH_THRESHOLD 1000
152 153
static void RunIntf( intf_thread_t *p_intf )
{
154 155 156
    int i_x, i_oldx = 0, i_sum = 0, i = 0;
    int p_oldx[FILTER_LENGTH];
    memset( p_oldx, 0, FILTER_LENGTH * sizeof( int ) );
157

158
    while( !intf_ShouldDie( p_intf ) )
159 160
    {
        vout_thread_t *p_vout;
Clément Stenac's avatar
Clément Stenac committed
161
        const char *psz_filter, *psz_type;
162 163 164 165 166 167
        vlc_bool_t b_change = VLC_FALSE;

        /* Wait a bit, get orientation, change filter if necessary */
        msleep( INTF_IDLE_SLEEP );

        i_x = GetOrientation( p_intf );
168 169 170 171
        i_sum += i_x - p_oldx[i];
        p_oldx[i++] = i_x;
        if( i == FILTER_LENGTH ) i = 0;
        i_x = i_sum / FILTER_LENGTH;
172

173 174 175 176
        if( p_intf->p_sys->b_use_rotate )
        {
            if( i_oldx != i_x )
            {
177 178 179 180 181
                /* TODO: cache object pointer */
                vlc_object_t *p_obj =
                vlc_object_find_name( p_intf->p_libvlc, "rotate", FIND_CHILD );
                if( p_obj )
                {
182 183
                    var_SetInteger( p_obj, "rotate-deciangle",
                            ((3600+i_x/2)%3600) );
184 185 186
                    i_oldx = i_x;
                    vlc_object_release( p_obj );
                }
187 188 189 190
            }
            continue;
        }

191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229
        if( i_x < -HIGH_THRESHOLD && i_oldx > -LOW_THRESHOLD )
        {
            b_change = VLC_TRUE;
            psz_filter = "transform";
            psz_type = "270";
        }
        else if( ( i_x > -LOW_THRESHOLD && i_oldx < -HIGH_THRESHOLD )
                 || ( i_x < LOW_THRESHOLD && i_oldx > HIGH_THRESHOLD ) )
        {
            b_change = VLC_TRUE;
            psz_filter = "";
            psz_type = "";
        }
        else if( i_x > HIGH_THRESHOLD && i_oldx < LOW_THRESHOLD )
        {
            b_change = VLC_TRUE;
            psz_filter = "transform";
            psz_type = "90";
        }

        if( !b_change )
        {
            continue;
        }

        p_vout = (vout_thread_t *)
            vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
        if( !p_vout )
        {
            continue;
        }

        config_PutPsz( p_vout, "transform-type", psz_type );
        var_SetString( p_vout, "vout-filter", psz_filter );
        vlc_object_release( p_vout );

        i_oldx = i_x;
    }
}
230 231 232
#undef FILTER_LENGTH
#undef LOW_THRESHOLD
#undef HIGH_THRESHOLD
233 234

/*****************************************************************************
235
 * GetOrientation: get laptop orientation, range -1800 / +1800
236 237 238 239
 *****************************************************************************/
static int GetOrientation( intf_thread_t *p_intf )
{
    FILE *f;
Jérome Decoodt's avatar
Jérome Decoodt committed
240 241 242 243
    int i_x, i_y;
#ifdef __APPLE__
    int i_z;
#endif
244 245 246 247 248 249 250 251 252 253 254 255 256
    switch( p_intf->p_sys->sensor )
    {
    case HDAPS_SENSOR:
        f = fopen( "/sys/devices/platform/hdaps/position", "r" );
        if( !f )
        {
            return 0;
        }

        i_x = i_y = 0;
        fscanf( f, "(%d,%d)", &i_x, &i_y );
        fclose( f );

257
        return ( i_x - p_intf->p_sys->i_calibrate ) * 10;
258 259 260 261 262 263 264 265 266 267 268

    case AMS_SENSOR:
        f = fopen( "/sys/devices/ams/x", "r" );
        if( !f )
        {
            return 0;
        }

        fscanf( f, "%d", &i_x);
        fclose( f );

269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
        return - i_x * 30; /* FIXME: arbitrary */
#ifdef __APPLE__
    case UNIMOTION_SENSOR:
        if( read_sms_raw( p_intf->p_sys->unimotion_hw, &i_x, &i_y, &i_z ) )
        {
            double d_norm = sqrt( i_x*i_x+i_z*i_z );
            if( d_norm < 100 )
                return 0;
            double d_x = i_x / d_norm;
            if( i_z > 0 )
                return -asin(d_x)*3600/3.141;
            else
                return 3600 + asin(d_x)*3600/3.141;
        }
        else
            return 0;
Jérome Decoodt's avatar
Jérome Decoodt committed
285
#endif
286 287 288 289 290
    default:
        return 0;
    }
}