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-rw-r--r--sys/v4l2/gstv4l2element.c176
-rw-r--r--sys/v4l2/gstv4l2element.h5
2 files changed, 180 insertions, 1 deletions
diff --git a/sys/v4l2/gstv4l2element.c b/sys/v4l2/gstv4l2element.c
index 45ae11c8..c9a8118c 100644
--- a/sys/v4l2/gstv4l2element.c
+++ b/sys/v4l2/gstv4l2element.c
@@ -21,11 +21,18 @@
#include <config.h>
#endif
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
#include "gstv4l2xoverlay.h"
#include "gstv4l2colorbalance.h"
+#include <gst/propertyprobe/propertyprobe.h>
+
/* elementfactory details */
static GstElementDetails gst_v4l2element_details = {
"Generic video4linux2 Element",
@@ -99,6 +106,163 @@ gst_v4l2_interface_init (GstInterfaceClass *klass)
}
+static const GList *
+gst_v4l2_probe_get_properties (GstPropertyProbe *probe)
+{
+ GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
+ static GList *list = NULL;
+
+ if (!list) {
+ list = g_list_append (NULL,
+ g_object_class_find_property (klass, "device"));
+ }
+
+ return list;
+}
+
+static gboolean
+gst_v4l2_class_probe_devices (GstV4l2ElementClass *klass,
+ gboolean check)
+{
+ static gboolean init = FALSE;
+
+ if (!init && !check) {
+ gchar *dev_base[] = { "/dev/video", "/dev/v4l/video", NULL };
+ gint base, n, fd;
+
+ while (klass->devices) {
+ GList *item = klass->devices;
+ gchar *device = item->data;
+
+ klass->devices = g_list_remove (klass->devices, item);
+ g_free (device);
+ }
+
+ /* detect /dev entries */
+ for (n = 0; n < 64; n++) {
+ for (base = 0; dev_base[base] != NULL; base++) {
+ struct stat s;
+ gchar *device = g_strdup_printf ("%s%d",
+ dev_base[base], n);
+
+ /* does the /dev/ entry exist at all? */
+ if (stat (device, &s) == 0) {
+ /* yes: is a device attached? */
+ if ((fd = open (device, O_RDONLY)) > 0 ||
+ errno == EBUSY) {
+ if (fd > 0)
+ close (fd);
+
+ klass->devices =
+ g_list_append (klass->devices,
+ device);
+ break;
+ }
+ }
+ g_free (device);
+ }
+ }
+
+ init = TRUE;
+ }
+
+ return init;
+}
+
+static void
+gst_v4l2_probe_probe_property (GstPropertyProbe *probe,
+ guint prop_id,
+ const GParamSpec *pspec)
+{
+ GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
+
+ switch (prop_id) {
+ case ARG_DEVICE:
+ gst_v4l2_class_probe_devices (klass, FALSE);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gst_v4l2_probe_needs_probe (GstPropertyProbe *probe,
+ guint prop_id,
+ const GParamSpec *pspec)
+{
+ GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
+ gboolean ret = FALSE;
+
+ switch (prop_id) {
+ case ARG_DEVICE:
+ ret = !gst_v4l2_class_probe_devices (klass, TRUE);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
+ break;
+ }
+
+ return ret;
+}
+
+static GValueArray *
+gst_v4l2_class_list_devices (GstV4l2ElementClass *klass)
+{
+ GValueArray *array;
+ GValue value = { 0 };
+ GList *item;
+
+ if (!klass->devices)
+ return NULL;
+
+ array = g_value_array_new (g_list_length (klass->devices));
+ item = klass->devices;
+ g_value_init (&value, G_TYPE_STRING);
+ while (item) {
+ gchar *device = item->data;
+
+ g_value_set_string (&value, device);
+ g_value_array_append (array, &value);
+
+ item = item->next;
+ }
+ g_value_unset (&value);
+
+ return array;
+}
+
+static GValueArray *
+gst_v4l2_probe_get_values (GstPropertyProbe *probe,
+ guint prop_id,
+ const GParamSpec *pspec)
+{
+ GstV4l2ElementClass *klass = GST_V4L2ELEMENT_GET_CLASS (probe);
+ GValueArray *array = NULL;
+
+ switch (prop_id) {
+ case ARG_DEVICE:
+ array = gst_v4l2_class_list_devices (klass);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
+ break;
+ }
+
+ return array;
+}
+
+
+static void
+gst_v4l2_property_probe_interface_init (GstPropertyProbeInterface *iface)
+{
+ iface->get_properties = gst_v4l2_probe_get_properties;
+ iface->probe_property = gst_v4l2_probe_probe_property;
+ iface->needs_probe = gst_v4l2_probe_needs_probe;
+ iface->get_values = gst_v4l2_probe_get_values;
+}
+
+
GType
gst_v4l2element_get_type (void)
{
@@ -137,6 +301,11 @@ gst_v4l2element_get_type (void)
NULL,
NULL,
};
+ static const GInterfaceInfo v4l2_propertyprobe_info = {
+ (GInterfaceInitFunc) gst_v4l2_property_probe_interface_init,
+ NULL,
+ NULL,
+ };
v4l2element_type =
g_type_register_static(GST_TYPE_ELEMENT,
@@ -154,6 +323,9 @@ gst_v4l2element_get_type (void)
g_type_add_interface_static (v4l2element_type,
GST_TYPE_COLOR_BALANCE,
&v4l2_colorbalance_info);
+ g_type_add_interface_static (v4l2element_type,
+ GST_TYPE_PROPERTY_PROBE,
+ &v4l2_propertyprobe_info);
}
return v4l2element_type;
@@ -193,7 +365,9 @@ static void
gst_v4l2element_base_init (GstV4l2ElementClass *klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
-
+
+ klass->devices = NULL;
+
gst_element_class_set_details (gstelement_class,
&gst_v4l2element_details);
}
diff --git a/sys/v4l2/gstv4l2element.h b/sys/v4l2/gstv4l2element.h
index 23d379e2..a57f66f0 100644
--- a/sys/v4l2/gstv4l2element.h
+++ b/sys/v4l2/gstv4l2element.h
@@ -51,6 +51,8 @@
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_V4L2ELEMENT))
#define GST_IS_V4L2ELEMENT_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_V4L2ELEMENT))
+#define GST_V4L2ELEMENT_GET_CLASS(obj) \
+ (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_V4L2ELEMENT, GstV4l2ElementClass))
typedef struct _GstV4l2Element GstV4l2Element;
@@ -87,6 +89,9 @@ struct _GstV4l2Element {
struct _GstV4l2ElementClass {
GstElementClass parent_class;
+ /* probed devices */
+ GList *devices;
+
/* signals */
void (*open) (GstElement *element,
const gchar *device);