libempathy/cheese-camera-device-monitor.c

   1 /*
   2  * Copyright © 2007,2008 Jaap Haitsma <jaap@haitsma.org>
   3  * Copyright © 2007-2009 daniel g. siegel <dgsiegel@gnome.org>
   4  * Copyright © 2008 Ryan Zeigler <zeiglerr@gmail.com>
   5  * Copyright © 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
   6  *
   7  * Licensed under the GNU General Public License Version 2
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22 #ifdef HAVE_CONFIG_H
  23   #include <config.h>
  24 #endif
  25
  26 #include <glib-object.h>
  27 #include <string.h>
  28
  29 #ifdef HAVE_UDEV
  30   #define G_UDEV_API_IS_SUBJECT_TO_CHANGE 1
  31   #include <gudev/gudev.h>
  32 #else
  33   #include <fcntl.h>
  34   #include <unistd.h>
  35   #include <sys/ioctl.h>
  36   #if USE_SYS_VIDEOIO_H > 0
  37     #include <sys/types.h>
  38     #include <sys/videoio.h>
  39   #elif defined (__sun)
  40     #include <sys/types.h>
  41     #include <sys/videodev2.h>
  42   #endif /* USE_SYS_VIDEOIO_H */
  43 #endif
  44
  45 #include "cheese-camera-device-monitor.h"
  46
  47 /**
  48  * SECTION:cheese-camera-device-monitor
  49  * @short_description: Simple object to enumerate v4l devices
  50  * @include: cheese/cheese-camera-device-monitor.h
  51  *
  52  * #CheeseCameraDeviceMonitor provides a basic interface for
  53  * video4linux device enumeration and hotplugging.
  54  *
  55  * It uses either GUdev or some platform specific code to list video
  56  * devices.  It is also capable (right now in linux only, with the
  57  * udev backend) to monitor device plugging and emit a
  58  * CheeseCameraDeviceMonitor::added or
  59  * CheeseCameraDeviceMonitor::removed signal when an event happens.
  60  */
  61
  62 G_DEFINE_TYPE (CheeseCameraDeviceMonitor, cheese_camera_device_monitor, G_TYPE_OBJECT)
  63
  64 #define CHEESE_CAMERA_DEVICE_MONITOR_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o),                               \
  65                                                                                   CHEESE_TYPE_CAMERA_DEVICE_MONITOR, \
  66                                                                                   CheeseCameraDeviceMonitorPrivate))
  67
  68 #define CHEESE_CAMERA_DEVICE_MONITOR_ERROR cheese_camera_device_monitor_error_quark ()
  69
  70 GST_DEBUG_CATEGORY (cheese_device_monitor_cat);
  71 #define GST_CAT_DEFAULT cheese_device_monitor_cat
  72
  73 enum CheeseCameraDeviceMonitorError
  74 {
  75   CHEESE_CAMERA_DEVICE_MONITOR_ERROR_UNKNOWN,
  76   CHEESE_CAMERA_DEVICE_MONITOR_ERROR_ELEMENT_NOT_FOUND
  77 };
  78
  79 typedef struct
  80 {
  81 #ifdef HAVE_UDEV
  82   GUdevClient *client;
  83 #else
  84   guint filler;
  85 #endif /* HAVE_UDEV */
  86 } CheeseCameraDeviceMonitorPrivate;
  87
  88 enum
  89 {
  90   ADDED,
  91   REMOVED,
  92   LAST_SIGNAL
  93 };
  94
  95 static guint monitor_signals[LAST_SIGNAL];
  96
  97 #if 0
  98 GQuark
  99 cheese_camera_device_monitor_error_quark (void)
 100 {
 101   return g_quark_from_static_string ("cheese-camera-error-quark");
 102 }
 103 #endif
 104
 105 #ifdef HAVE_UDEV
 106 static void
 107 cheese_camera_device_monitor_added (CheeseCameraDeviceMonitor *monitor,
 108                                     GUdevDevice               *udevice)
 109 {
 110   const char *device_file;
 111   const char *product_name;
 112   const char *vendor;
 113   const char *product;
 114   const char *bus;
 115   gint        vendor_id   = 0;
 116   gint        product_id  = 0;
 117   gint        v4l_version = 0;
 118
 119   const gchar *devpath = g_udev_device_get_property (udevice, "DEVPATH");
 120
 121   GST_INFO ("Checking udev device '%s'", devpath);
 122
 123   bus = g_udev_device_get_property (udevice, "ID_BUS");
 124   if (g_strcmp0 (bus, "usb") == 0)
 125   {
 126     vendor = g_udev_device_get_property (udevice, "ID_VENDOR_ID");
 127     if (vendor != NULL)
 128       vendor_id = g_ascii_strtoll (vendor, NULL, 16);
 129     product = g_udev_device_get_property (udevice, "ID_MODEL_ID");
 130     if (product != NULL)
 131       product_id = g_ascii_strtoll (product, NULL, 16);
 132     if (vendor_id == 0 || product_id == 0)
 133     {
 134       GST_WARNING ("Error getting vendor and product id");
 135     }
 136     else
 137     {
 138       GST_INFO ("Found device %04x:%04x, getting capabilities...", vendor_id, product_id);
 139     }
 140   }
 141   else
 142   {
 143     GST_INFO ("Not an usb device, skipping vendor and model id retrieval");
 144   }
 145
 146   device_file = g_udev_device_get_device_file (udevice);
 147   if (device_file == NULL)
 148   {
 149     GST_WARNING ("Error getting V4L device");
 150     return;
 151   }
 152
 153   /* vbi devices support capture capability too, but cannot be used,
 154    * so detect them by device name */
 155   if (strstr (device_file, "vbi"))
 156   {
 157     GST_INFO ("Skipping vbi device: %s", device_file);
 158     return;
 159   }
 160
 161   v4l_version = g_udev_device_get_property_as_int (udevice, "ID_V4L_VERSION");
 162   if (v4l_version == 2 || v4l_version == 1)
 163   {
 164     const char *caps;
 165
 166     caps = g_udev_device_get_property (udevice, "ID_V4L_CAPABILITIES");
 167     if (caps == NULL || strstr (caps, ":capture:") == NULL)
 168     {
 169       GST_WARNING ("Device %s seems to not have the capture capability, (radio tuner?)"
 170                    "Removing it from device list.", device_file);
 171       return;
 172     }
 173     product_name = g_udev_device_get_property (udevice, "ID_V4L_PRODUCT");
 174   }
 175   else if (v4l_version == 0)
 176   {
 177     GST_ERROR ("Fix your udev installation to include v4l_id, ignoring %s", device_file);
 178     return;
 179   }
 180   else
 181   {
 182     g_assert_not_reached ();
 183   }
 184
 185   g_signal_emit (monitor, monitor_signals[ADDED], 0,
 186                  devpath,
 187                  device_file,
 188                  product_name,
 189                  v4l_version);
 190 }
 191
 192 static void
 193 cheese_camera_device_monitor_removed (CheeseCameraDeviceMonitor *monitor,
 194                                       GUdevDevice               *udevice)
 195 {
 196   g_signal_emit (monitor, monitor_signals[REMOVED], 0,
 197                  g_udev_device_get_property (udevice, "DEVPATH"));
 198 }
 199
 200 static void
 201 cheese_camera_device_monitor_uevent_cb (GUdevClient               *client,
 202                                         const gchar               *action,
 203                                         GUdevDevice               *udevice,
 204                                         CheeseCameraDeviceMonitor *monitor)
 205 {
 206   if (g_str_equal (action, "remove"))
 207     cheese_camera_device_monitor_removed (monitor, udevice);
 208   else if (g_str_equal (action, "add"))
 209     cheese_camera_device_monitor_added (monitor, udevice);
 210 }
 211
 212 /**
 213  * cheese_camera_device_monitor_coldplug:
 214  * @monitor: a #CheeseCameraDeviceMonitor object.
 215  *
 216  * Will actively look for plugged in cameras and emit
 217  * ::added for those new cameras.
 218  * This is only required when your program starts, so as to connect
 219  * to those signals before they are emitted.
 220  */
 221 void
 222 cheese_camera_device_monitor_coldplug (CheeseCameraDeviceMonitor *monitor)
 223 {
 224   CheeseCameraDeviceMonitorPrivate *priv = CHEESE_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
 225   GList                            *devices, *l;
 226   gint                              i = 0;
 227
 228   if (priv->client == NULL)
 229     return;
 230
 231   GST_INFO ("Probing devices with udev...");
 232
 233   devices = g_udev_client_query_by_subsystem (priv->client, "video4linux");
 234
 235   /* Initialize camera structures */
 236   for (l = devices; l != NULL; l = l->next)
 237   {
 238     cheese_camera_device_monitor_added (monitor, l->data);
 239     g_object_unref (l->data);
 240     i++;
 241   }
 242   g_list_free (devices);
 243
 244   if (i == 0) GST_WARNING ("No device found");
 245 }
 246
 247 #else /* HAVE_UDEV */
 248 void
 249 cheese_camera_device_monitor_coldplug (CheeseCameraDeviceMonitor *monitor)
 250 {
 251   #if 0
 252   CheeseCameraDeviceMonitorPrivate *priv = CHEESE_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
 253   struct v4l2_capability            v2cap;
 254   struct video_capability           v1cap;
 255   int                               fd, ok;
 256
 257   if ((fd = open (device_path, O_RDONLY | O_NONBLOCK)) < 0)
 258   {
 259     g_warning ("Failed to open %s: %s", device_path, strerror (errno));
 260     return;
 261   }
 262   ok = ioctl (fd, VIDIOC_QUERYCAP, &v2cap);
 263   if (ok < 0)
 264   {
 265     ok = ioctl (fd, VIDIOCGCAP, &v1cap);
 266     if (ok < 0)
 267     {
 268       g_warning ("Error while probing v4l capabilities for %s: %s",
 269                  device_path, strerror (errno));
 270       close (fd);
 271       return;
 272     }
 273     g_print ("Detected v4l device: %s\n", v1cap.name);
 274     g_print ("Device type: %d\n", v1cap.type);
 275     gstreamer_src = "v4lsrc";
 276     product_name  = v1cap.name;
 277   }
 278   else
 279   {
 280     guint cap = v2cap.capabilities;
 281     g_print ("Detected v4l2 device: %s\n", v2cap.card);
 282     g_print ("Driver: %s, version: %d\n", v2cap.driver, v2cap.version);
 283
 284     /* g_print ("Bus info: %s\n", v2cap.bus_info); */ /* Doesn't seem anything useful */
 285     g_print ("Capabilities: 0x%08X\n", v2cap.capabilities);
 286     if (!(cap & V4L2_CAP_VIDEO_CAPTURE))
 287     {
 288       g_print ("Device %s seems to not have the capture capability, (radio tuner?)\n"
 289                "Removing it from device list.\n", device_path);
 290       close (fd);
 291       return;
 292     }
 293     gstreamer_src = "v4l2src";
 294     product_name  = (char *) v2cap.card;
 295   }
 296   close (fd);
 297
 298   GList *devices, *l;
 299
 300   g_print ("Probing devices with udev...\n");
 301
 302   if (priv->client == NULL)
 303     return;
 304
 305   devices = g_udev_client_query_by_subsystem (priv->client, "video4linux");
 306
 307   /* Initialize camera structures */
 308   for (l = devices; l != NULL; l = l->next)
 309   {
 310     cheese_camera_device_monitor_added (monitor, l->data);
 311     g_object_unref (l->data);
 312   }
 313   g_list_free (devices);
 314   #endif
 315 }
 316
 317 #endif /* HAVE_UDEV */
 318
 319 static void
 320 cheese_camera_device_monitor_finalize (GObject *object)
 321 {
 322 #ifdef HAVE_UDEV
 323   CheeseCameraDeviceMonitor *monitor = CHEESE_CAMERA_DEVICE_MONITOR (object);
 324   CheeseCameraDeviceMonitorPrivate *priv = CHEESE_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
 325
 326   if (priv->client != NULL)
 327   {
 328     g_object_unref (priv->client);
 329     priv->client = NULL;
 330   }
 331 #endif /* HAVE_UDEV */
 332   G_OBJECT_CLASS (cheese_camera_device_monitor_parent_class)->finalize (object);
 333 }
 334
 335 static void
 336 cheese_camera_device_monitor_class_init (CheeseCameraDeviceMonitorClass *klass)
 337 {
 338   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 339
 340   if (cheese_device_monitor_cat == NULL)
 341     GST_DEBUG_CATEGORY_INIT (cheese_device_monitor_cat,
 342                              "cheese-device-monitor",
 343                              0, "Cheese Camera Device Monitor");
 344
 345   object_class->finalize = cheese_camera_device_monitor_finalize;
 346
 347   /**
 348    * CheeseCameraDeviceMonitor::added:
 349    * @device: A private object representing the newly added camera.
 350    * @id: Device unique identifier.
 351    * @device: Device file name  (e.g. /dev/video2).
 352    * @product_name: Device product name (human readable, intended to be displayed in a UI).
 353    * @api_version: Supported video4linux API: 1 for v4l, 2 for v4l2.
 354    *
 355    * The ::added signal is emitted when a camera is added, or on start-up
 356    * after #cheese_camera_device_monitor_colplug is called.
 357    **/
 358   monitor_signals[ADDED] = g_signal_new ("added", G_OBJECT_CLASS_TYPE (klass),
 359                                          G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 360                                          G_STRUCT_OFFSET (CheeseCameraDeviceMonitorClass, added),
 361                                          NULL, NULL,
 362                                          g_cclosure_marshal_generic,
 363                                          G_TYPE_NONE, 4, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INT);
 364
 365   /**
 366    * CheeseCameraDeviceMonitor::removed:
 367    * @device: A private object representing the newly added camera
 368    * @id: Device unique identifier.
 369    *
 370    * The ::removed signal is emitted when a camera is un-plugged, or
 371    * disabled on the system.
 372    **/
 373   monitor_signals[REMOVED] = g_signal_new ("removed", G_OBJECT_CLASS_TYPE (klass),
 374                                            G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 375                                            G_STRUCT_OFFSET (CheeseCameraDeviceMonitorClass, removed),
 376                                            NULL, NULL,
 377                                            g_cclosure_marshal_generic,
 378                                            G_TYPE_NONE, 1, G_TYPE_STRING);
 379
 380   g_type_class_add_private (klass, sizeof (CheeseCameraDeviceMonitorPrivate));
 381 }
 382
 383 static void
 384 cheese_camera_device_monitor_init (CheeseCameraDeviceMonitor *monitor)
 385 {
 386 #ifdef HAVE_UDEV
 387   CheeseCameraDeviceMonitorPrivate *priv         = CHEESE_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
 388   const gchar *const                subsystems[] = {"video4linux", NULL};
 389
 390   priv->client = g_udev_client_new (subsystems);
 391   g_signal_connect (G_OBJECT (priv->client), "uevent",
 392                     G_CALLBACK (cheese_camera_device_monitor_uevent_cb), monitor);
 393 #endif /* HAVE_UDEV */
 394 }
 395
 396 /**
 397  * cheese_camera_device_monitor_new:
 398  *
 399  * Returns a new #CheeseCameraDeviceMonitor object.
 400  *
 401  * Return value: a new #CheeseCameraDeviceMonitor object.
 402  **/
 403 CheeseCameraDeviceMonitor *
 404 cheese_camera_device_monitor_new (void)
 405 {
 406   return g_object_new (CHEESE_TYPE_CAMERA_DEVICE_MONITOR, NULL);
 407 }
 408
 409 /*
 410  * vim: sw=2 ts=8 cindent noai bs=2
 411  */