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basesrc: implement a default get_caps function

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Don't rely on the return value of a vmethod to trigger the default
implementation but make a real defaul implementation of the method that the
subclass can chain up to.
This commit is contained in:
Wim Taymans 2011-11-10 16:02:59 +01:00
parent 86a45f236e
commit 54a9c5d3f8
1 changed files with 30 additions and 18 deletions
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48
libs/gst/base/gstbasesrc.c
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@ -278,6 +278,8 @@ gst_base_src_get_type (void)
return base_src_type; return base_src_type;
} }
static GstCaps *gst_base_src_default_get_caps (GstBaseSrc * bsrc,
GstCaps * filter);
static GstCaps *gst_base_src_getcaps (GstPad * pad, GstCaps * filter); static GstCaps *gst_base_src_getcaps (GstPad * pad, GstCaps * filter);
static void gst_base_src_default_fixate (GstBaseSrc * src, GstCaps * caps); static void gst_base_src_default_fixate (GstBaseSrc * src, GstCaps * caps);
static void gst_base_src_fixate (GstBaseSrc * src, GstCaps * caps); static void gst_base_src_fixate (GstBaseSrc * src, GstCaps * caps);
@ -367,6 +369,7 @@ gst_base_src_class_init (GstBaseSrcClass * klass)
GST_DEBUG_FUNCPTR (gst_base_src_change_state); GST_DEBUG_FUNCPTR (gst_base_src_change_state);
gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_src_send_event); gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_src_send_event);
klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_src_default_get_caps);
klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate); klass->negotiate = GST_DEBUG_FUNCPTR (gst_base_src_default_negotiate);
klass->fixate = GST_DEBUG_FUNCPTR (gst_base_src_default_fixate); klass->fixate = GST_DEBUG_FUNCPTR (gst_base_src_default_fixate);
klass->prepare_seek_segment = klass->prepare_seek_segment =
@ -806,6 +809,33 @@ gst_base_src_set_caps (GstBaseSrc * src, GstCaps * caps)
return res; return res;
} }
static GstCaps *
gst_base_src_default_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstCaps *caps = NULL;
GstPadTemplate *pad_template;
GstBaseSrcClass *bclass;
bclass = GST_BASE_SRC_GET_CLASS (bsrc);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
if (pad_template != NULL) {
caps = gst_pad_template_get_caps (pad_template);
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
}
return caps;
}
static GstCaps * static GstCaps *
gst_base_src_getcaps (GstPad * pad, GstCaps * filter) gst_base_src_getcaps (GstPad * pad, GstCaps * filter)
{ {
@ -818,24 +848,6 @@ gst_base_src_getcaps (GstPad * pad, GstCaps * filter)
if (bclass->get_caps) if (bclass->get_caps)
caps = bclass->get_caps (bsrc, filter); caps = bclass->get_caps (bsrc, filter);
if (caps == NULL) {
GstPadTemplate *pad_template;
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
if (pad_template != NULL) {
caps = gst_pad_template_get_caps (pad_template);
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
}
}
return caps; return caps;
} }