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Added a simple function gst_pad_recover_caps_error that a plugin should call from now on (instead of gst_element_erro...

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Original commit message from CVS:
Added a simple function gst_pad_recover_caps_error that a plugin
should call from now on (instead of gst_element_error). This function
will emit a caps_nego_failed signal that the app can catch to resolve
the negotiation failure.
This commit is contained in:
Wim Taymans 2003-04-17 22:29:31 +00:00
parent 8365acd9b6
commit 9811bb9aad
2 changed files with 51 additions and 4 deletions
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44
gst/gstpad.c
View file

@ -1987,6 +1987,50 @@ gst_pad_recalc_allowed_caps (GstPad *pad)
return TRUE;
}
/**
* gst_pad_recover_caps_error:
* @pad: a #GstPad that had a failed capsnego
* @allowed: possible caps for the link
*
* Attempt to recover from a failed caps negotiation. This function
* is typically called by a plugin that exhausted its list of caps
* and wants the application to resolve the issue. The application
* should connect to the pad's caps_nego_failed signal and should
* resolve the issue by connecting another element for example.
*
* Returns: TRUE when the issue was resolved, dumps detailed information
* on the console and returns FALSE otherwise.
*/
gboolean
gst_pad_recover_caps_error (GstPad *pad, GstCaps *allowed)
{
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
/* see if someone can resolve this */
if (g_signal_has_handler_pending (G_OBJECT (pad),
gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, FALSE))
{
/* clear pad caps first */
gst_caps_replace (&GST_PAD_CAPS (pad), NULL);
/* lets hope some signal manages to set the caps again */
g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, allowed);
/* if the pad has caps now or is disabled, it's ok */
if (GST_PAD_CAPS (pad) != NULL || !GST_PAD_IS_ACTIVE (pad))
return TRUE;
}
/* report error */
parent = gst_pad_get_parent (pad);
gst_element_error (parent, "negotiation failed on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
return FALSE;
}
/**
* gst_pad_get_bufferpool:
* @pad: a #GstPad to get the bufferpool from.

11
gst/gstpad.h
View file

@ -217,12 +217,13 @@ struct _GstRealPad {
};
struct _GstRealPadClass {
GstPadClass parent_class;
GstPadClass parent_class;
/* signal callbacks */
void (*caps_nego_failed) (GstPad *pad);
void (*linked) (GstPad *pad, GstPad *peer);
void (*unlinked) (GstPad *pad, GstPad *peer);
void (*caps_nego_failed) (GstPad *pad, GstCaps *caps);
void (*linked) (GstPad *pad, GstPad *peer);
void (*unlinked) (GstPad *pad, GstPad *peer);
};
struct _GstGhostPad {
@ -446,6 +447,8 @@ gboolean gst_pad_try_relink_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps
GstCaps* gst_pad_get_allowed_caps (GstPad *pad);
gboolean gst_pad_recalc_allowed_caps (GstPad *pad);
gboolean gst_pad_recover_caps_error (GstPad *pad, GstCaps *allowed);
/* data passing functions */
void gst_pad_push (GstPad *pad, GstBuffer *buf);
GstBuffer* gst_pad_pull (GstPad *pad);