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v4lsrc: optional support for device probing with gudev

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Enumerate v4l devices using gudev if available.

Fixes bug #583640.
This commit is contained in:
Filippo Argiolas 2009-07-03 11:38:01 +02:00
parent 94baad7490
commit 0f29d71a7d
3 changed files with 108 additions and 8 deletions
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23
configure.ac
View file

@ -436,6 +436,29 @@ AG_GST_CHECK_FEATURE(GST_V4L, [Video 4 Linux], video4linux, [
fi
])
# Optional gudev for device probing
AC_ARG_WITH([gudev],
AC_HELP_STRING([--with-gudev],
[device detection with gudev]),
[],
[with_gudev=check])
if test x$HAVE_GST_V4L = xyes; then
if test x$with_gudev != xno; then
PKG_CHECK_MODULES(GUDEV, [ gudev-1.0 >= 143 ],
[ have_gudev=yes
AC_DEFINE(HAVE_GUDEV, 1,
[Whether gudev is available for device detection])
AC_DEFINE([G_UDEV_API_IS_SUBJECT_TO_CHANGE], 1, [I know the API is subject to change.])
], [
have_gudev=no
])
else
have_gudev=no
fi
fi
AC_SUBST(GUDEV_CFLAGS)
AC_SUBST(GUDEV_LIBS)
dnl *** ext plug-ins ***
dnl keep this list sorted alphabetically !

6
sys/v4l/Makefile.am
View file

@ -22,10 +22,12 @@ libgstvideo4linux_la_SOURCES = \
# gstv4lmjpegsink.c v4lmjpegsink_calls.c
libgstvideo4linux_la_CFLAGS = \
$(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(X_CFLAGS)
$(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(X_CFLAGS) \
$(GUDEV_CFLAGS)
libgstvideo4linux_la_LIBADD = \
$(top_builddir)/gst-libs/gst/interfaces/libgstinterfaces-$(GST_MAJORMINOR).la \
$(GST_BASE_LIBS) $(GST_LIBS) $(xv_libs)
$(GST_BASE_LIBS) $(GST_LIBS) $(xv_libs) \
$(GUDEV_LIBS)
libgstvideo4linux_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstvideo4linux_la_LIBTOOLFLAGS = --tag=disable-static

87
sys/v4l/gstv4lelement.c
View file

@ -32,6 +32,10 @@
#include <gst/interfaces/propertyprobe.h>
#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif
#include "v4l_calls.h"
#include "gstv4ltuner.h"
#ifdef HAVE_XVIDEO
@ -48,6 +52,8 @@ enum
PROP_FLAGS
};
GST_DEBUG_CATEGORY (v4lelement_debug);
#define GST_CAT_DEFAULT v4lelement_debug
static void gst_v4lelement_init_interfaces (GType type);
@ -108,20 +114,76 @@ gst_v4l_probe_get_properties (GstPropertyProbe * probe)
return list;
}
static gboolean init = FALSE;
static GList *devices = NULL;
#ifdef HAVE_GUDEV
static gboolean
gst_v4l_class_probe_devices_with_udev (GstV4lElementClass * klass,
gboolean check)
{
GUdevClient *client;
GList *item;
if (!check) {
while (devices) {
gchar *device = devices->data;
devices = g_list_remove (devices, device);
g_free (device);
}
GST_INFO ("Enumerating video4linux devices from udev");
client = g_udev_client_new (NULL);
if (!client) {
GST_WARNING ("Failed to initialize gudev client");
goto finish;
}
item = g_udev_client_query_by_subsystem (client, "video4linux");
while (item) {
GUdevDevice *device = item->data;
gchar *devnode = g_strdup (g_udev_device_get_device_file (device));
gint api = g_udev_device_get_property_as_int (device, "ID_V4L_VERSION");
GST_INFO ("Found new device: %s, API: %d", devnode, api);
/* Append v4l1 devices only. If api is 0 probably v4l_id has
been stripped out of the current udev installation, append
anyway */
if (api == 0) {
GST_WARNING
("Couldn't retrieve ID_V4L_VERSION, silly udev installation?");
}
if ((api == 1 || api == 0)) {
devices = g_list_append (devices, devnode);
} else {
g_free (devnode);
}
g_object_unref (device);
item = item->next;
}
g_list_free (item);
init = TRUE;
}
finish:
if (client) {
g_object_unref (client);
}
klass->devices = devices;
return init;
}
#endif /* HAVE_GUDEV */
static gboolean
gst_v4l_class_probe_devices (GstV4lElementClass * klass, gboolean check)
{
static gboolean init = FALSE;
static GList *devices = NULL;
if (!check) {
gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };
gint base, n, fd;
while (devices) {
GList *item = devices;
gchar *device = item->data;
gchar *device = devices->data;
devices = g_list_remove (devices, device);
g_free (device);
}
@ -163,7 +225,12 @@ gst_v4l_probe_probe_property (GstPropertyProbe * probe,
switch (prop_id) {
case PROP_DEVICE:
#ifdef HAVE_GUDEV
if (!gst_v4l_class_probe_devices_with_udev (klass, FALSE))
gst_v4l_class_probe_devices (klass, FALSE);
#else /* !HAVE_GUDEV */
gst_v4l_class_probe_devices (klass, FALSE);
#endif /* HAVE_GUDEV */
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
@ -180,6 +247,11 @@ gst_v4l_probe_needs_probe (GstPropertyProbe * probe,
switch (prop_id) {
case PROP_DEVICE:
#ifdef HAVE_GUDEV
ret = !gst_v4l_class_probe_devices_with_udev (klass, FALSE);
#else /* !HAVE_GUDEV */
ret = !gst_v4l_class_probe_devices (klass, TRUE);
#endif /* HAVE_GUDEV */
ret = !gst_v4l_class_probe_devices (klass, TRUE);
break;
default:
@ -319,6 +391,9 @@ gst_v4lelement_base_init (gpointer g_class)
GstV4lElementClass *klass = GST_V4LELEMENT_CLASS (g_class);
klass->devices = NULL;
GST_DEBUG_CATEGORY_INIT (v4lelement_debug, "v4lelement", 0,
"V4L Base Class debug");
}
static void