/* This file is a copy of cheese-camera-device-monitor.c from Tpaw. We
* just renamespaced it to avoid conflicts when linking on libcheese. */
/*
* Copyright © 2007,2008 Jaap Haitsma <jaap@haitsma.org>
* Copyright © 2007-2009 daniel g. siegel <dgsiegel@gnome.org>
* Copyright © 2008 Ryan Zeigler <zeiglerr@gmail.com>
* Copyright © 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#ifdef HAVE_UDEV
#define G_UDEV_API_IS_SUBJECT_TO_CHANGE 1
#include <gudev/gudev.h>
#else
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#if USE_SYS_VIDEOIO_H > 0
#include <sys/types.h>
#include <sys/videoio.h>
#elif defined (__sun)
#include <sys/types.h>
#include <sys/videodev2.h>
#endif /* USE_SYS_VIDEOIO_H */
#endif
#include "cheese-camera-device-monitor.h"
/**
* SECTION:cheese-camera-device-monitor
* @short_description: Simple object to enumerate v4l devices
* @include: cheese/cheese-camera-device-monitor.h
*
* #TpawCameraDeviceMonitor provides a basic interface for
* video4linux device enumeration and hotplugging.
*
* It uses either GUdev or some platform specific code to list video
* devices. It is also capable (right now in linux only, with the
* udev backend) to monitor device plugging and emit a
* TpawCameraDeviceMonitor::added or
* TpawCameraDeviceMonitor::removed signal when an event happens.
*/
G_DEFINE_TYPE (TpawCameraDeviceMonitor, tpaw_camera_device_monitor, G_TYPE_OBJECT)
#define TPAW_CAMERA_DEVICE_MONITOR_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), \
TPAW_TYPE_CAMERA_DEVICE_MONITOR, \
TpawCameraDeviceMonitorPrivate))
#define TPAW_CAMERA_DEVICE_MONITOR_ERROR tpaw_camera_device_monitor_error_quark ()
#define DEBUG_FLAG TPAW_DEBUG_OTHER
#include "tpaw-debug.h"
enum TpawCameraDeviceMonitorError
{
TPAW_CAMERA_DEVICE_MONITOR_ERROR_UNKNOWN,
TPAW_CAMERA_DEVICE_MONITOR_ERROR_ELEMENT_NOT_FOUND
};
typedef struct
{
#ifdef HAVE_UDEV
GUdevClient *client;
#else
guint filler;
#endif /* HAVE_UDEV */
} TpawCameraDeviceMonitorPrivate;
enum
{
ADDED,
REMOVED,
LAST_SIGNAL
};
static guint monitor_signals[LAST_SIGNAL];
#if 0
GQuark
tpaw_camera_device_monitor_error_quark (void)
{
return g_quark_from_static_string ("tpaw-camera-error-quark");
}
#endif
#ifdef HAVE_UDEV
static void
tpaw_camera_device_monitor_added (TpawCameraDeviceMonitor *monitor,
GUdevDevice *udevice)
{
const char *device_file;
const char *product_name;
const char *vendor;
const char *product;
const char *bus;
gint vendor_id = 0;
gint product_id = 0;
gint v4l_version = 0;
const gchar *devpath = g_udev_device_get_property (udevice, "DEVPATH");
DEBUG ("Checking udev device '%s'", devpath);
bus = g_udev_device_get_property (udevice, "ID_BUS");
if (g_strcmp0 (bus, "usb") == 0)
{
vendor = g_udev_device_get_property (udevice, "ID_VENDOR_ID");
if (vendor != NULL)
vendor_id = g_ascii_strtoll (vendor, NULL, 16);
product = g_udev_device_get_property (udevice, "ID_MODEL_ID");
if (product != NULL)
product_id = g_ascii_strtoll (product, NULL, 16);
if (vendor_id == 0 || product_id == 0)
{
DEBUG ("Error getting vendor and product id");
}
else
{
DEBUG ("Found device %04x:%04x, getting capabilities...", vendor_id, product_id);
}
}
else
{
DEBUG ("Not an usb device, skipping vendor and model id retrieval");
}
device_file = g_udev_device_get_device_file (udevice);
if (device_file == NULL)
{
DEBUG ("Error getting V4L device");
return;
}
/* vbi devices support capture capability too, but cannot be used,
* so detect them by device name */
if (strstr (device_file, "vbi"))
{
DEBUG ("Skipping vbi device: %s", device_file);
return;
}
v4l_version = g_udev_device_get_property_as_int (udevice, "ID_V4L_VERSION");
if (v4l_version == 2 || v4l_version == 1)
{
const char *caps;
caps = g_udev_device_get_property (udevice, "ID_V4L_CAPABILITIES");
if (caps == NULL || strstr (caps, ":capture:") == NULL)
{
DEBUG ("Device %s seems to not have the capture capability, (radio tuner?)"
"Removing it from device list.", device_file);
return;
}
product_name = g_udev_device_get_property (udevice, "ID_V4L_PRODUCT");
}
else if (v4l_version == 0)
{
DEBUG ("Fix your udev installation to include v4l_id, ignoring %s", device_file);
return;
}
else
{
g_assert_not_reached ();
}
g_signal_emit (monitor, monitor_signals[ADDED], 0,
devpath,
device_file,
product_name,
v4l_version);
}
static void
tpaw_camera_device_monitor_removed (TpawCameraDeviceMonitor *monitor,
GUdevDevice *udevice)
{
g_signal_emit (monitor, monitor_signals[REMOVED], 0,
g_udev_device_get_property (udevice, "DEVPATH"));
}
static void
tpaw_camera_device_monitor_uevent_cb (GUdevClient *client,
const gchar *action,
GUdevDevice *udevice,
TpawCameraDeviceMonitor *monitor)
{
if (g_str_equal (action, "remove"))
tpaw_camera_device_monitor_removed (monitor, udevice);
else if (g_str_equal (action, "add"))
tpaw_camera_device_monitor_added (monitor, udevice);
}
/**
* tpaw_camera_device_monitor_coldplug:
* @monitor: a #TpawCameraDeviceMonitor object.
*
* Will actively look for plugged in cameras and emit
* ::added for those new cameras.
* This is only required when your program starts, so as to connect
* to those signals before they are emitted.
*/
void
tpaw_camera_device_monitor_coldplug (TpawCameraDeviceMonitor *monitor)
{
TpawCameraDeviceMonitorPrivate *priv = TPAW_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
GList *devices, *l;
gint i = 0;
if (priv->client == NULL)
return;
DEBUG ("Probing devices with udev...");
devices = g_udev_client_query_by_subsystem (priv->client, "video4linux");
/* Initialize camera structures */
for (l = devices; l != NULL; l = l->next)
{
tpaw_camera_device_monitor_added (monitor, l->data);
g_object_unref (l->data);
i++;
}
g_list_free (devices);
if (i == 0) DEBUG ("No device found");
}
#else /* HAVE_UDEV */
void
tpaw_camera_device_monitor_coldplug (TpawCameraDeviceMonitor *monitor)
{
#if 0
TpawCameraDeviceMonitorPrivate *priv = TPAW_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
struct v4l2_capability v2cap;
struct video_capability v1cap;
int fd, ok;
if ((fd = open (device_path, O_RDONLY | O_NONBLOCK)) < 0)
{
g_warning ("Failed to open %s: %s", device_path, strerror (errno));
return;
}
ok = ioctl (fd, VIDIOC_QUERYCAP, &v2cap);
if (ok < 0)
{
ok = ioctl (fd, VIDIOCGCAP, &v1cap);
if (ok < 0)
{
g_warning ("Error while probing v4l capabilities for %s: %s",
device_path, strerror (errno));
close (fd);
return;
}
g_print ("Detected v4l device: %s\n", v1cap.name);
g_print ("Device type: %d\n", v1cap.type);
gstreamer_src = "v4lsrc";
product_name = v1cap.name;
}
else
{
guint cap = v2cap.capabilities;
g_print ("Detected v4l2 device: %s\n", v2cap.card);
g_print ("Driver: %s, version: %d\n", v2cap.driver, v2cap.version);
/* g_print ("Bus info: %s\n", v2cap.bus_info); */ /* Doesn't seem anything useful */
g_print ("Capabilities: 0x%08X\n", v2cap.capabilities);
if (!(cap & V4L2_CAP_VIDEO_CAPTURE))
{
g_print ("Device %s seems to not have the capture capability, (radio tuner?)\n"
"Removing it from device list.\n", device_path);
close (fd);
return;
}
gstreamer_src = "v4l2src";
product_name = (char *) v2cap.card;
}
close (fd);
GList *devices, *l;
g_print ("Probing devices with udev...\n");
if (priv->client == NULL)
return;
devices = g_udev_client_query_by_subsystem (priv->client, "video4linux");
/* Initialize camera structures */
for (l = devices; l != NULL; l = l->next)
{
tpaw_camera_device_monitor_added (monitor, l->data);
g_object_unref (l->data);
}
g_list_free (devices);
#endif
}
#endif /* HAVE_UDEV */
static void
tpaw_camera_device_monitor_finalize (GObject *object)
{
#ifdef HAVE_UDEV
TpawCameraDeviceMonitor *monitor = TPAW_CAMERA_DEVICE_MONITOR (object);
TpawCameraDeviceMonitorPrivate *priv = TPAW_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
if (priv->client != NULL)
{
g_object_unref (priv->client);
priv->client = NULL;
}
#endif /* HAVE_UDEV */
G_OBJECT_CLASS (tpaw_camera_device_monitor_parent_class)->finalize (object);
}
static void
tpaw_camera_device_monitor_class_init (TpawCameraDeviceMonitorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = tpaw_camera_device_monitor_finalize;
/**
* TpawCameraDeviceMonitor::added:
* @device: A private object representing the newly added camera.
* @id: Device unique identifier.
* @device: Device file name (e.g. /dev/video2).
* @product_name: Device product name (human readable, intended to be displayed in a UI).
* @api_version: Supported video4linux API: 1 for v4l, 2 for v4l2.
*
* The ::added signal is emitted when a camera is added, or on start-up
* after #tpaw_camera_device_monitor_colplug is called.
**/
monitor_signals[ADDED] = g_signal_new ("added", G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (TpawCameraDeviceMonitorClass, added),
NULL, NULL,
g_cclosure_marshal_generic,
G_TYPE_NONE, 4, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_INT);
/**
* TpawCameraDeviceMonitor::removed:
* @device: A private object representing the newly added camera
* @id: Device unique identifier.
*
* The ::removed signal is emitted when a camera is un-plugged, or
* disabled on the system.
**/
monitor_signals[REMOVED] = g_signal_new ("removed", G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (TpawCameraDeviceMonitorClass, removed),
NULL, NULL,
g_cclosure_marshal_generic,
G_TYPE_NONE, 1, G_TYPE_STRING);
g_type_class_add_private (klass, sizeof (TpawCameraDeviceMonitorPrivate));
}
static void
tpaw_camera_device_monitor_init (TpawCameraDeviceMonitor *monitor)
{
#ifdef HAVE_UDEV
TpawCameraDeviceMonitorPrivate *priv = TPAW_CAMERA_DEVICE_MONITOR_GET_PRIVATE (monitor);
const gchar *const subsystems[] = {"video4linux", NULL};
priv->client = g_udev_client_new (subsystems);
g_signal_connect (G_OBJECT (priv->client), "uevent",
G_CALLBACK (tpaw_camera_device_monitor_uevent_cb), monitor);
#endif /* HAVE_UDEV */
}
/**
* tpaw_camera_device_monitor_new:
*
* Returns a new #TpawCameraDeviceMonitor object.
*
* Return value: a new #TpawCameraDeviceMonitor object.
**/
TpawCameraDeviceMonitor *
tpaw_camera_device_monitor_new (void)
{
return g_object_new (TPAW_TYPE_CAMERA_DEVICE_MONITOR, NULL);
}
/*
* vim: sw=2 ts=8 cindent noai bs=2
*/