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gst/gstbuffer.h: Documentation fix.

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Original commit message from CVS:
* gst/gstbuffer.h:
Documentation fix.

* gst/gstpad.c: (gst_pad_init), (gst_pad_acceptcaps_default),
(gst_pad_accept_caps), (gst_pad_configure_sink),
(gst_pad_configure_src), (gst_pad_chain), (gst_pad_push):
Make the default acceptcaps behaviour be to check the requested
caps against the gst_pad_get_caps output.

Ensure that gst_pad_accept_caps is used to check caps when a pad
doesn't have a setcaps function, so that pads automatically refuse
caps that they don't allow in their pad template. (Fixes #332986)

When a buffer with attached caps is pushed, ensure that the source
pad receives those caps even if the element didn't call
gst_pad_set_caps first.
This commit is contained in:
Jan Schmidt 2006-03-15 16:29:02 +00:00
parent 006b34dc3f
commit 30643217ba
3 changed files with 84 additions and 34 deletions
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19
ChangeLog
View file

@ -1,3 +1,22 @@
2006-03-15 Jan Schmidt <thaytan@mad.scientist.com>
* gst/gstbuffer.h:
Documentation fix.
* gst/gstpad.c: (gst_pad_init), (gst_pad_acceptcaps_default),
(gst_pad_accept_caps), (gst_pad_configure_sink),
(gst_pad_configure_src), (gst_pad_chain), (gst_pad_push):
Make the default acceptcaps behaviour be to check the requested
caps against the gst_pad_get_caps output.
Ensure that gst_pad_accept_caps is used to check caps when a pad
doesn't have a setcaps function, so that pads automatically refuse
caps that they don't allow in their pad template. (Fixes #332986)
When a buffer with attached caps is pushed, ensure that the source
pad receives those caps even if the element didn't call
gst_pad_set_caps first.
2006-03-15 Wim Taymans <wim@fluendo.com>
* libs/gst/base/gstadapter.c:

2
gst/gstbuffer.h
View file

@ -314,7 +314,7 @@ G_STMT_START { \
* Tests if you can safely write data into a buffer's data array or validly
* modify the caps and timestamp metadata. Metadata in a GstBuffer is always
* writable, but it is only safe to change it when there is only one owner
* of the buffer - ie, the buffer is 1.
* of the buffer - ie, the refcount is 1.
*/
#define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT (buf))
/**

97
gst/gstpad.c
View file

@ -109,6 +109,7 @@ static GstFlowReturn handle_pad_block (GstPad * pad);
static GstCaps *gst_pad_get_caps_unlocked (GstPad * pad);
static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
static gboolean gst_pad_activate_default (GstPad * pad);
static gboolean gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent);
@ -340,6 +341,7 @@ gst_pad_init (GstPad * pad)
pad->querytypefunc = GST_DEBUG_FUNCPTR (gst_pad_get_query_types_default);
pad->queryfunc = GST_DEBUG_FUNCPTR (gst_pad_query_default);
pad->intlinkfunc = GST_DEBUG_FUNCPTR (gst_pad_get_internal_links_default);
GST_PAD_ACCEPTCAPSFUNC (pad) = GST_DEBUG_FUNCPTR (gst_pad_acceptcaps_default);
pad->do_buffer_signals = 0;
pad->do_event_signals = 0;
@ -1332,7 +1334,9 @@ gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps)
* @acceptcaps: the #GstPadAcceptCapsFunction to set.
*
* Sets the given acceptcaps function for the pad. The acceptcaps function
* will be called to check if the pad can accept the given caps.
* will be called to check if the pad can accept the given caps. Setting the
* acceptcaps function to NULL restores the default behaviour of allowing
* any caps that matches the caps from gst_pad_get_caps.
*/
void
gst_pad_set_acceptcaps_function (GstPad * pad,
@ -2053,6 +2057,30 @@ gst_pad_fixate_caps (GstPad * pad, GstCaps * caps)
}
}
/* Default accept caps implementation just checks against
* against the allowed caps for the pad */
static gboolean
gst_pad_acceptcaps_default (GstPad * pad, GstCaps * caps)
{
/* get the caps and see if it intersects to something
* not empty */
GstCaps *intersect;
GstCaps *allowed;
gboolean result = FALSE;
allowed = gst_pad_get_caps (pad);
if (allowed) {
intersect = gst_caps_intersect (allowed, caps);
result = !gst_caps_is_empty (intersect);
gst_caps_unref (allowed);
gst_caps_unref (intersect);
}
return result;
}
/**
* gst_pad_accept_caps:
* @pad: a #GstPad to check
@ -2081,26 +2109,12 @@ gst_pad_accept_caps (GstPad * pad, GstCaps * caps)
GST_DEBUG_PAD_NAME (pad), pad);
GST_OBJECT_UNLOCK (pad);
if (acceptfunc) {
if (G_LIKELY (acceptfunc)) {
/* we can call the function */
result = acceptfunc (pad, caps);
} else {
/* else see get the caps and see if it intersects to something
* not empty */
GstCaps *intersect;
GstCaps *allowed;
allowed = gst_pad_get_caps (pad);
if (allowed) {
intersect = gst_caps_intersect (allowed, caps);
result = !gst_caps_is_empty (intersect);
gst_caps_unref (allowed);
gst_caps_unref (intersect);
} else {
result = FALSE;
}
/* Only null if the element explicitly unset it */
result = gst_pad_acceptcaps_default (pad, caps);
}
return result;
}
@ -2226,19 +2240,17 @@ could_not_set:
static gboolean
gst_pad_configure_sink (GstPad * pad, GstCaps * caps)
{
GstPadAcceptCapsFunction acceptcaps;
GstPadSetCapsFunction setcaps;
gboolean res;
acceptcaps = GST_PAD_ACCEPTCAPSFUNC (pad);
setcaps = GST_PAD_SETCAPSFUNC (pad);
/* See if pad accepts the caps, by calling acceptcaps, only
* needed if no setcaps function */
if (setcaps == NULL && acceptcaps != NULL) {
if (!acceptcaps (pad, caps))
/* See if pad accepts the caps - only needed if
* no setcaps function */
if (setcaps == NULL)
if (!gst_pad_accept_caps (pad, caps))
goto not_accepted;
}
/* set caps on pad if call succeeds */
res = gst_pad_set_caps (pad, caps);
/* no need to unref the caps here, set_caps takes a ref and
@ -2257,19 +2269,17 @@ not_accepted:
static gboolean
gst_pad_configure_src (GstPad * pad, GstCaps * caps, gboolean dosetcaps)
{
GstPadAcceptCapsFunction acceptcaps;
GstPadSetCapsFunction setcaps;
gboolean res;
acceptcaps = GST_PAD_ACCEPTCAPSFUNC (pad);
setcaps = GST_PAD_SETCAPSFUNC (pad);
/* See if pad accepts the caps, by calling acceptcaps, only
* needed if no setcaps function */
if (setcaps == NULL && acceptcaps != NULL) {
if (!acceptcaps (pad, caps))
/* See if pad accepts the caps - only needed if
* no setcaps function */
if (setcaps == NULL)
if (!gst_pad_accept_caps (pad, caps))
goto not_accepted;
}
if (dosetcaps)
res = gst_pad_set_caps (pad, caps);
else
@ -3169,7 +3179,7 @@ gst_pad_chain (GstPad * pad, GstBuffer * buffer)
/* we got a new datatype on the pad, see if it can handle it */
if (G_UNLIKELY (caps_changed)) {
GST_DEBUG ("caps changed to %" GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (pad, "caps changed to %" GST_PTR_FORMAT, caps);
if (G_UNLIKELY (!gst_pad_configure_sink (pad, caps)))
goto not_negotiated;
}
@ -3252,6 +3262,8 @@ gst_pad_push (GstPad * pad, GstBuffer * buffer)
{
GstPad *peer;
GstFlowReturn ret;
GstCaps *caps;
gboolean caps_changed;
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC, GST_FLOW_ERROR);
@ -3283,8 +3295,21 @@ gst_pad_push (GstPad * pad, GstBuffer * buffer)
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
goto not_linked;
gst_object_ref (peer);
/* Before pushing the buffer to the peer pad, ensure that caps
* are set on this pad */
caps = GST_BUFFER_CAPS (buffer);
caps_changed = caps && caps != GST_PAD_CAPS (pad);
GST_OBJECT_UNLOCK (pad);
/* we got a new datatype from the pad, it had better handle it */
if (G_UNLIKELY (caps_changed)) {
GST_DEBUG ("caps changed to %" GST_PTR_FORMAT, caps);
if (G_UNLIKELY (!gst_pad_configure_src (pad, caps, TRUE)))
goto not_negotiated;
}
ret = gst_pad_chain (peer, buffer);
gst_object_unref (peer);
@ -3313,6 +3338,12 @@ not_linked:
GST_OBJECT_UNLOCK (pad);
return GST_FLOW_NOT_LINKED;
}
not_negotiated:
{
GST_CAT_DEBUG_OBJECT (GST_CAT_SCHEDULING, pad,
"element pushed buffer then refused to accept the caps");
return GST_FLOW_NOT_NEGOTIATED;
}
}
/**