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Add new use_explicit_caps() and set_explicit_caps() functions.

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Original commit message from CVS:
Add new use_explicit_caps() and set_explicit_caps() functions.
This commit is contained in:
David Schleef 2004-01-02 07:02:43 +00:00
parent 1af3878c8f
commit 9ad670e297
3 changed files with 106 additions and 1 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2004-01-01 David Schleef <ds@schleef.org>
* gst/gstpad.c: (gst_pad_set_explicit_caps),
(gst_pad_explicit_getcaps), (gst_pad_explicit_link),
(gst_pad_use_explicit_caps):
* gst/gstpad.h:
Add new functions. gst_pad_use_explicit_caps() sets up a pad
to use an internal getcaps and link fuction so that negotiation
always results in the explicitly set caps.
gst_pad_set_explicit_caps() sets the explicit caps. These functions
are particularly useful for decoders.
2003-12-31 David Schleef <ds@schleef.org>
* gst/elements/gstidentity.c: (gst_identity_class_init),

89
gst/gstpad.c
View file

@ -2098,6 +2098,95 @@ gst_pad_proxy_fixate (GstPad *pad, const GstCaps *caps, gpointer unused)
return NULL;
}
/**
* gst_pad_set_explicit_caps:
* @pad: a #GstPad to set the explicit caps of
* @caps: the #GstCaps to set
*
* If a pad has been told to use explicit caps, this function is used
* to set the explicit caps. If @caps is NULL, the explicit caps are
* unset.
*
* This function calls gst_pad_try_set_caps() on the pad. If that
* call fails, gst_element_error() is called to indicate a negotiation
* failure.
*
* Returns: TRUE if the caps were set correctly, otherwise FALSE
*/
gboolean
gst_pad_set_explicit_caps (GstPad *pad, GstCaps *caps)
{
GstPadLinkReturn link_ret;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
if (caps == NULL) {
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
return TRUE;
}
if (!GST_PAD_IS_LINKED (pad)) {
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), caps);
return TRUE;
}
link_ret = gst_pad_try_set_caps (pad, caps);
if (GST_PAD_LINK_FAILED (link_ret)) {
gst_element_error (gst_pad_get_parent (pad), "negotiation failed");
return FALSE;
}
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), caps);
return TRUE;
}
static GstCaps *
gst_pad_explicit_getcaps (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
return gst_caps_copy (GST_RPAD_EXPLICIT_CAPS (pad));
}
static GstPadLinkReturn
gst_pad_explicit_link (GstPad *pad, const GstCaps *caps)
{
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
return GST_PAD_LINK_DELAYED;
}
return GST_PAD_LINK_OK;
}
/**
* gst_pad_use_explicit_caps:
* @pad: a #GstPad to set to use explicit caps
*
* This function handles negotiation for pads that need to be set
* to particular caps under complete control of the element, based
* on some state in the element. This is often the case with
* decoders and other elements whose caps is determined by the data
* stream.
*
* WARNING: This function is a hack and will be replaced with something
* better in gstreamer-0.9.
*/
void
gst_pad_use_explicit_caps (GstPad *pad)
{
g_return_if_fail (GST_IS_PAD (pad));
gst_pad_set_getcaps_function (pad, gst_pad_explicit_getcaps);
gst_pad_set_link_function (pad, gst_pad_explicit_link);
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
}
/**
* gst_pad_proxy_link:
* @pad: a #GstPad to proxy to.

6
gst/gstpad.h
View file

@ -199,8 +199,9 @@ struct _GstRealPad {
GstProbeDispatcher probedisp;
GstPadLink *link;
GstCaps *explicit_caps;
gpointer _gst_reserved[GST_PADDING - 1];
gpointer _gst_reserved[GST_PADDING - 2];
};
struct _GstRealPadClass {
@ -261,6 +262,7 @@ struct _GstGhostPadClass {
#define GST_RPAD_FIXATEFUNC(pad) (((GstRealPad *)(pad))->fixatefunc)
#define GST_RPAD_BUFFERALLOCFUNC(pad) (((GstRealPad *)(pad))->bufferallocfunc)
#define GST_RPAD_LINK(pad) (((GstRealPad *)(pad))->link)
#define GST_RPAD_EXPLICIT_CAPS(pad) (((GstRealPad *)(pad))->explicit_caps)
/* GstGhostPad */
#define GST_GPAD_REALPAD(pad) (((GstGhostPad *)(pad))->realpad)
@ -416,6 +418,8 @@ GstCaps * gst_pad_proxy_fixate (GstPad *pad, co
#ifndef GST_DISABLE_DEPRECATED
GstPadLinkReturn gst_pad_proxy_link (GstPad *pad, const GstCaps *caps);
#endif
gboolean gst_pad_set_explicit_caps (GstPad *pad, GstCaps *caps);
void gst_pad_use_explicit_caps (GstPad *pad);
gboolean gst_pad_relink_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps);
#ifndef GST_DISABLE_DEPRECATED
gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad);