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v4l2object: Add event helpers

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/870>
This commit is contained in:
Nicolas Dufresne 2021-02-04 11:01:38 -05:00
parent 954e38a6b9
commit 4be9bf4085
2 changed files with 81 additions and 0 deletions
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5
sys/v4l2/gstv4l2object.h
View file

@ -341,6 +341,11 @@ gboolean gst_v4l2_set_attribute (GstV4l2Object * v4l2object, int attribute
gboolean gst_v4l2_set_string_attribute (GstV4l2Object * v4l2object, int attribute_num, const char *value);
gboolean gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls);
/* events */
gboolean gst_v4l2_subscribe_event (GstV4l2Object * v4l2object, guint32 event);
gboolean gst_v4l2_dequeue_event (GstV4l2Object * v4l2object, struct v4l2_event *event);
G_END_DECLS
#endif /* __GST_V4L2_OBJECT_H__ */

76
sys/v4l2/v4l2_calls.c
View file

@ -1195,3 +1195,79 @@ output_failed:
}
return FALSE;
}
static const gchar *
gst_v4l2_event_to_string (guint32 event)
{
switch (event) {
case V4L2_EVENT_ALL:
return "ALL";
case V4L2_EVENT_VSYNC:
return "VSYNC";
case V4L2_EVENT_EOS:
return "EOS";
case V4L2_EVENT_CTRL:
return "CTRL";
case V4L2_EVENT_FRAME_SYNC:
return "FRAME_SYNC";
case V4L2_EVENT_SOURCE_CHANGE:
return "SOURCE_CHANGE";
case V4L2_EVENT_MOTION_DET:
return "MOTION_DET";
default:
break;
}
return "UNKNOWN";
}
gboolean
gst_v4l2_subscribe_event (GstV4l2Object * v4l2object, guint32 event)
{
struct v4l2_event_subscription sub = {.type = event, };
gint ret;
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Subscribing to '%s' event",
gst_v4l2_event_to_string (event));
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
if (ret < 0)
goto failed;
return TRUE;
/* ERRORS */
failed:
{
if (errno != ENOTTY)
GST_ERROR_OBJECT (v4l2object->dbg_obj,
"Cannot subscribe to '%s' event: %s",
gst_v4l2_event_to_string (event), g_strerror (errno));
return FALSE;
}
}
gboolean
gst_v4l2_dequeue_event (GstV4l2Object * v4l2object, struct v4l2_event * event)
{
gint ret;
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
ret = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DQEVENT, event);
if (ret < 0) {
GST_ERROR_OBJECT (v4l2object->dbg_obj, "DQEVENT failed: %s",
g_strerror (errno));
return FALSE;
}
GST_DEBUG_OBJECT (v4l2object->dbg_obj, "Dequeued a '%s' event.",
gst_v4l2_event_to_string (event->type));
return TRUE;
}