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basetrans: improve fixate_caps function

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Make it possible to also implement non-inplace fixate functions. Let the fixate
function make the caps writable when needed because some fixate functions might
not need to modify the caps.
This commit is contained in:
Wim Taymans 2012-02-22 12:24:34 +01:00
parent 7b0e4f27fb
commit 90a82c7e81
2 changed files with 16 additions and 11 deletions
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21
libs/gst/base/gstbasetransform.c
View file

@ -322,8 +322,8 @@ static GstFlowReturn gst_base_transform_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstCaps *gst_base_transform_default_transform_caps (GstBaseTransform *
trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static void gst_base_transform_default_fixate (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstCaps *gst_base_transform_default_fixate_caps (GstBaseTransform *
trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstCaps *gst_base_transform_query_caps (GstBaseTransform * trans,
GstPad * pad, GstCaps * filter);
static gboolean gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
@ -387,7 +387,8 @@ gst_base_transform_class_init (GstBaseTransformClass * klass)
klass->transform_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_caps);
klass->fixate_caps = GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate);
klass->fixate_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate_caps);
klass->accept_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
@ -930,12 +931,15 @@ gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
return ret;
}
static void
gst_base_transform_default_fixate (GstBaseTransform * trans,
static GstCaps *
gst_base_transform_default_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GST_DEBUG_OBJECT (trans, "using default caps fixate function");
othercaps = gst_caps_make_writable (othercaps);
gst_caps_fixate (othercaps);
GST_DEBUG_OBJECT (trans, "fixated to %" GST_PTR_FORMAT, othercaps);
return othercaps;
}
/* given a fixed @caps on @pad, create the best possible caps for the
@ -1063,14 +1067,13 @@ gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
/* second attempt at fixation, call the fixate vmethod */
/* caps could be fixed but the subclass may want to add fields */
if (klass->fixate_caps) {
othercaps = gst_caps_make_writable (othercaps);
GST_DEBUG_OBJECT (trans, "calling fixate_caps for %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT " on pad %s:%s", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
/* note that we pass the complete array of structures to the fixate
* function, it needs to truncate itself */
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
othercaps =
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
is_fixed = gst_caps_is_fixed (othercaps);
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}

6
libs/gst/base/gstbasetransform.h
View file

@ -148,7 +148,9 @@ struct _GstBaseTransform {
* caps, what caps are allowed on the other pad in this
* element ?
* @fixate_caps: Optional. Given the pad in this direction and the given
* caps, fixate the caps on the other pad.
* caps, fixate the caps on the other pad. The function takes
* ownership of @othercaps and returns a fixated version of
* @othercaps. @othercaps is not guaranteed to be writable.
* @accept_caps: Optional. Since 0.10.30
* Subclasses can override this method to check if @caps can be
* handled by the element. The default implementation might not be
@ -224,7 +226,7 @@ struct _GstBaseTransformClass {
GstCaps* (*transform_caps) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps, GstCaps *filter);
void (*fixate_caps) (GstBaseTransform *trans,
GstCaps* (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
gboolean (*accept_caps) (GstBaseTransform *trans, GstPadDirection direction,