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v4l2: open/close the device in READY

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This allows to query the device in READY. Before one need to switch it to PAUSED
and that also starts streaming.
This commit is contained in:
Stefan Kost 2009-06-22 15:56:58 +03:00
parent ace09d40bd
commit 0b475ba774
1 changed files with 39 additions and 9 deletions
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48
sys/v4l2/gstv4l2src.c
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@ -238,6 +238,10 @@ GST_BOILERPLATE_FULL (GstV4l2Src, gst_v4l2src, GstPushSrc, GST_TYPE_PUSH_SRC,
static void gst_v4l2src_dispose (GObject * object);
static void gst_v4l2src_finalize (GstV4l2Src * v4l2src);
/* element methods */
static GstStateChangeReturn gst_v4l2src_change_state (GstElement * element,
GstStateChange transition);
/* basesrc methods */
static gboolean gst_v4l2src_start (GstBaseSrc * src);
static gboolean gst_v4l2src_unlock (GstBaseSrc * src);
@ -279,10 +283,12 @@ static void
gst_v4l2src_class_init (GstV4l2SrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBaseSrcClass *basesrc_class;
GstPushSrcClass *pushsrc_class;
gobject_class = G_OBJECT_CLASS (klass);
element_class = GST_ELEMENT_CLASS (klass);
basesrc_class = GST_BASE_SRC_CLASS (klass);
pushsrc_class = GST_PUSH_SRC_CLASS (klass);
@ -291,6 +297,8 @@ gst_v4l2src_class_init (GstV4l2SrcClass * klass)
gobject_class->set_property = gst_v4l2src_set_property;
gobject_class->get_property = gst_v4l2src_get_property;
element_class->change_state = gst_v4l2src_change_state;
gst_v4l2_object_install_properties_helper (gobject_class);
g_object_class_install_property (gobject_class, PROP_QUEUE_SIZE,
g_param_spec_uint ("queue-size", "Queue size",
@ -1145,10 +1153,6 @@ gst_v4l2src_start (GstBaseSrc * src)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
/* open the device */
if (!gst_v4l2_object_start (v4l2src->v4l2object))
return FALSE;
v4l2src->offset = 0;
return TRUE;
@ -1176,7 +1180,6 @@ gst_v4l2src_unlock_stop (GstBaseSrc * src)
return TRUE;
}
static gboolean
gst_v4l2src_stop (GstBaseSrc * src)
{
@ -1191,16 +1194,43 @@ gst_v4l2src_stop (GstBaseSrc * src)
return FALSE;
}
/* close the device */
if (!gst_v4l2_object_stop (v4l2src->v4l2object))
return FALSE;
v4l2src->fps_d = 0;
v4l2src->fps_n = 0;
return TRUE;
}
static GstStateChangeReturn
gst_v4l2src_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstV4l2Src *v4l2src = GST_V4L2SRC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
/* open the device */
if (!gst_v4l2_object_start (v4l2src->v4l2object))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
/* close the device */
if (!gst_v4l2_object_stop (v4l2src->v4l2object))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
return ret;
}
static GstFlowReturn
gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf)
{