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docs/design/part-gstghostpad.txt: Update ascii art in documentation.

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Original commit message from CVS:
* docs/design/part-gstghostpad.txt:
Update ascii art in documentation.
* gst/gstghostpad.c: (gst_proxy_pad_do_internal_link),
(gst_proxy_pad_set_target_unlocked), (gst_proxy_pad_init),
(gst_ghost_pad_parent_set), (gst_ghost_pad_parent_unset),
(gst_ghost_pad_internal_do_activate_push),
(gst_ghost_pad_internal_do_activate_pull),
(gst_ghost_pad_do_activate_push), (gst_ghost_pad_do_activate_pull),
(gst_ghost_pad_do_link), (gst_ghost_pad_do_unlink),
(gst_ghost_pad_dispose), (gst_ghost_pad_new_full),
(gst_ghost_pad_set_target):
Small cleanups and leak fixes.
Remove some checks now that the internal pad is never NULL.
Fix the case where linking pads without a target would create nasty
criticals. Fixes #341029.
Don't assign a GstPadLinkReturn to a gboolean and mess up the return
value of _set_target().
* tests/check/gst/gstghostpad.c: (GST_START_TEST),
(gst_ghost_pad_suite):
Some more tests for creating and linking untargeted ghostpads.
This commit is contained in:
Wim Taymans 2006-08-31 15:19:44 +00:00
parent ce6e126d47
commit 47e5ba2f15
4 changed files with 398 additions and 274 deletions
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25
ChangeLog
View file

@ -1,3 +1,28 @@
2006-08-31 Wim Taymans <wim@fluendo.com>
* docs/design/part-gstghostpad.txt:
Update ascii art in documentation.
* gst/gstghostpad.c: (gst_proxy_pad_do_internal_link),
(gst_proxy_pad_set_target_unlocked), (gst_proxy_pad_init),
(gst_ghost_pad_parent_set), (gst_ghost_pad_parent_unset),
(gst_ghost_pad_internal_do_activate_push),
(gst_ghost_pad_internal_do_activate_pull),
(gst_ghost_pad_do_activate_push), (gst_ghost_pad_do_activate_pull),
(gst_ghost_pad_do_link), (gst_ghost_pad_do_unlink),
(gst_ghost_pad_dispose), (gst_ghost_pad_new_full),
(gst_ghost_pad_set_target):
Small cleanups and leak fixes.
Remove some checks now that the internal pad is never NULL.
Fix the case where linking pads without a target would create nasty
criticals. Fixes #341029.
Don't assign a GstPadLinkReturn to a gboolean and mess up the return
value of _set_target().
* tests/check/gst/gstghostpad.c: (GST_START_TEST),
(gst_ghost_pad_suite):
Some more tests for creating and linking untargeted ghostpads.
2006-08-31 Edward Hervey <edward@fluendo.com>
* docs/gst/gstreamer-sections.txt:

292
docs/design/part-gstghostpad.txt
View file

@ -9,9 +9,9 @@ Ghostpads
- Must look like a real GstPad on both sides.
- target of Ghostpad must be changeable
- target can be initially NULL
* a GhostPad is implemented using a smaller GstProxyPad class:
* a GhostPad is implemented using a private GstProxyPad class:
GstProxyPad
@ -20,17 +20,57 @@ Ghostpads
|------------------|
| GstPad *target |
(------------------)
| GstPad *internal |
(------------------)
GstGhostPad
(------------------) -\
| GstPad | |
|------------------| > GstProxyPad
| GstPad *target | |
|------------------| |
| GstPad *target | > GstProxyPad
|------------------| |
| GstPad *internal | |
|------------------| -/
| GstPad *internal |
| <private data> |
(------------------)
A GstGhostPad (X) is _always_ created together with a GstProxyPad (Y).
The internal pad pointers are set to point to the eachother. The
GstProxyPad pairs have opposite directions, the GstGhostPad has the same
direction as the (future) ghosted pad (target).
(- X --------)
| |
| target * |
|------------|
| internal *----+
(------------) |
^ V
| (- Y --------)
| | |
| | target * |
| |------------|
+----* internal |
(------------)
Which we will abreviate to:
(- X --------)
| |
| target *--------->//
(------------)
|
(- Y --------)
| target *----->//
(------------)
The GstGhostPad (X) is also set as the parent of the GstProxyPad (Y).
The target is a pointer to the internal pads peer. It is an optimisation to
quickly get to the peer of a ghostpad without having to dereference the
internal->peer.
Some use case follow with a description of how the datastructure
is modified.
@ -40,11 +80,11 @@ Ghostpads
gst_ghost_pad_new (char *name, GstPad *target)
1) create new GstGhostPad X
1) create new GstGhostPad X + GstProxyPad Y
2) X name set to @name
3) X direction is the same as the target
4) the target is set to @target
5) internal is NULL
3) X direction is the same as the target, Y is opposite.
4) the target of X is set to @target
5) Y is linked to @target
6) link/unlink and activate functions are set up
on GstGhostPad.
@ -53,9 +93,11 @@ Ghostpads
(- X --------) |
| | |------)
| target *------------------> | sink |
|------------| |------)
| internal *---->// (--------------
(------------)
(------------) -------> |------)
| / (--------------
(- Y --------) / (pad link)
//<-----* target |/
(------------)
- Automatically takes same direction as target.
- target is filled in automatically.
@ -65,20 +107,20 @@ Ghostpads
gst_ghost_pad_new_no_target (char *name, GstPadDirection dir)
1) create new GstGhostPad X
1) create new GstGhostPad X + GstProxyPad Y
2) X name set to @name
3) X direction is @dir
4) internal is NULL
5) link/unlink and activate functions are set up
on GstGhostPad.
(- X --------)
| |
| target *------>//
|------------|
| internal *---->//
| target *--------->//
(------------)
|
(- Y --------)
| target *----->//
(------------)
- allows for setting the target later
@ -89,57 +131,67 @@ Ghostpads
(- X --------)
| |
| target *------>//
|------------|
| internal *---->//
| target *--------->//
(------------)
|
(- Y --------)
| target *----->//
(------------)
1) assert direction of newtarget == X direction
2) target is set to newtarget
3) internal pad Y is linked to newtarget
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
|------------| |------)
| internal *--->// (--------
(------------)
(--------------
(- X --------) |
| | |------)
| target *------------------> | sink |
(------------) -------> |------)
| / (--------------
(- Y --------) / (pad link)
//<-----* target |/
(------------)
* Setting target on an targetted unlinked ghostpad
* Setting target on a targetted unlinked ghostpad
gst_ghost_pad_set_target (char *name, GstPad *newtarget)
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
|------------| |------)
| internal *--->// (--------
(------------)
(--------------
(- X --------) |
| | |-------)
| target *------------------> | sink1 |
(------------) -------> |-------)
| / (--------------
(- Y --------) / (pad link)
//<-----* target |/
(------------)
1) assert direction of newtarget == X direction
2) target is set to newtarget
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
|------------| |------)
| internal *--->// (--------
(------------)
1) assert direction of newtarget (sink2) == X direction
2) unlink internal pad Y and oldtarget
3) target is set to newtarget (sink2)
4) internal pad Y is linked to newtarget
(--------------
(- X --------) |
| | |-------)
| target *------------------> | sink2 |
(------------) -------> |-------)
| / (--------------
(- Y --------) / (pad link)
//<-----* target |/
(------------)
* Linking a pad to an untargetted ghostpad:
gst_pad_link (src, X)
(- X --------)
| |
| target *------>//
|------------|
| internal *---->//
(- X --------)
| |
| target *--------->//
(------------)
|
(- Y --------)
| target *----->//
(------------)
-------)
|
@ -148,28 +200,28 @@ Ghostpads
(-----|
-------)
X is a sink GstGhostPad without a target. The internal GstProxyPad Y has
the same direction as the src pad (peer).
1) link function is called
a) new GstProxyPad Y is created
b) Y direction is same as peer
c) Y target is set to peer
d) X internal pad is set to Y (X is parent of Y)
e) Y is activated in the same mode as X
f) core makes link from src to X
a) Y direction is same as @src
b) Y target is set to @src
c) Y is activated in the same mode as X
d) core makes link from @src to X
(- X --------)
| |
| target *----->//
>|------------|
(real pad link) / | internal * |
/ (----------|-)
/ |
-------) / V
| / (- Y ------)
(-----|/ | |
| src |<-------------* target |
(-----| (----------)
>(------------)
(real pad link) / |
/ (- Y ------)
/ -----* target |
-------) / / (----------)
| / /
(-----|/ /
| src |<----
(-----|
-------)
@ -177,39 +229,37 @@ Ghostpads
gst_pad_link (src, X)
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
|------------| |------)
| internal *--->// (--------
(------------)
-------)
|
(-----|
| src |
(-----|
-------)
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
(------------) >|------)
| / (--------
| /
| /
-------) | / (real pad link)
| (- Y ------) /
(-----| | |/
| src | //<----* target |
(-----| (----------)
-------)
1) link function is called
a) new GstProxyPad Y is created
b) Y direction is same as peer
c) Y target is set to peer
d) X internal pad is set to Y (X is parent of Y)
e) link is made from Y to X target (sink)
f) Y is activated in the same mode as X
g) core makes link from src to X
a) Y direction is same as @src
b) Y target is set to @src
c) Y is activated in the same mode as X
d) core makes link from @src to X
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
>|------------| >|------)
(real pad link) / | internal * | / (--------
/ (----------|-) /
>(------------) >|------)
(real pad link) / | / (--------
/ | /
/ | /
-------) / V / (real pad link)
-------) / | / (real pad link)
| / (- Y ------) /
(-----|/ | |/
| src |<-------------* target |
@ -224,74 +274,70 @@ Ghostpads
(- X --------)
| |
| target *----->//
>|------------|
(real pad link) / | internal * |
/ (----------|-)
| target *------>//
>(------------)
(real pad link) / |
/ |
/ |
-------) / V
-------) / |
| / (- Y ------)
(-----|/ | |
| src |<-------------* target |
(-----| (----------)
-------)
1) assert direction of newtarget == X direction
2) X target is set to newtarget
3) Y (X internal) is linked to newtarget
1) assert direction of @newtarget == X direction
2) X target is set to @newtarget
3) Y is linked to @newtarget
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
>|------------| >|------)
(real pad link) / | internal * | / (--------
/ (----------|-) /
>(------------) >|------)
(real pad link) / | / (--------
/ | /
/ | /
-------) / V / (real pad link)
-------) / | / (real pad link)
| / (- Y ------) /
(-----|/ | |/
| src |<-------------* target |
(-----| (----------)
-------)
* Setting target on targetted linked ghostpad:
gst_ghost_pad_set_target (char *name, GstPad *newtarget)
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
>|------------| >|------)
(real pad link) / | internal * | / (--------
/ (----------|-) /
| | |-------)
| target *------------->| sink1 |
>(------------) >|-------)
(real pad link) / | / (--------
/ | /
/ | /
-------) / V / (real pad link)
-------) / | / (real pad link)
| / (- Y ------) /
(-----|/ | |/
| src |<-------------* target |
(-----| (----------)
-------)
1) assert direction of newtarget == X direction
1) assert direction of @newtarget == X direction
2) Y and X target are unlinked
2) X target is set to newtarget
3) Y (X internal) is linked to newtarget
2) X target is set to @newtarget
3) Y is linked to @newtarget
(--------
(- X --------) |
| | |------)
| target *------------->| sink |
>|------------| >|------)
(real pad link) / | internal * | / (--------
/ (----------|-) /
| | |-------)
| target *------------->| sink2 |
>(------------) >|-------)
(real pad link) / | / (--------
/ | /
/ | /
-------) / V / (real pad link)
-------) / | / (real pad link)
| / (- Y ------) /
(-----|/ | |/
| src |<-------------* target |

255
gst/gstghostpad.c
View file

@ -58,7 +58,6 @@
#define GST_PROXY_PAD_TARGET(pad) (GST_PROXY_PAD (pad)->target)
#define GST_PROXY_PAD_INTERNAL(pad) (GST_PROXY_PAD (pad)->internal)
typedef struct _GstProxyPad GstProxyPad;
typedef struct _GstProxyPadClass GstProxyPadClass;
@ -136,8 +135,6 @@ gst_proxy_pad_do_event (GstPad * pad, GstEvent * event)
gboolean res = FALSE;
GstPad *internal = gst_proxy_pad_get_internal (pad);
g_return_val_if_fail (internal != NULL, FALSE);
res = gst_pad_push_event (internal, event);
gst_object_unref (internal);
@ -161,8 +158,8 @@ gst_proxy_pad_do_query (GstPad * pad, GstQuery * query)
static GList *
gst_proxy_pad_do_internal_link (GstPad * pad)
{
GstPad *target = gst_proxy_pad_get_target (pad);
GList *res = NULL;
GstPad *target = gst_proxy_pad_get_target (pad);
if (target) {
res = gst_pad_get_internal_links (target);
@ -179,8 +176,6 @@ gst_proxy_pad_do_bufferalloc (GstPad * pad, guint64 offset, guint size,
GstFlowReturn result;
GstPad *internal = gst_proxy_pad_get_internal (pad);
g_return_val_if_fail (internal != NULL, GST_FLOW_NOT_LINKED);
result = gst_pad_alloc_buffer (internal, offset, size, caps, buf);
gst_object_unref (internal);
@ -193,8 +188,6 @@ gst_proxy_pad_do_chain (GstPad * pad, GstBuffer * buffer)
GstPad *internal = gst_proxy_pad_get_internal (pad);
GstFlowReturn res;
g_return_val_if_fail (internal != NULL, GST_FLOW_NOT_LINKED);
res = gst_pad_push (internal, buffer);
gst_object_unref (internal);
@ -208,8 +201,6 @@ gst_proxy_pad_do_getrange (GstPad * pad, guint64 offset, guint size,
GstPad *internal = gst_proxy_pad_get_internal (pad);
GstFlowReturn res;
g_return_val_if_fail (internal != NULL, GST_FLOW_NOT_LINKED);
res = gst_pad_pull_range (internal, offset, size, buffer);
gst_object_unref (internal);
@ -222,8 +213,6 @@ gst_proxy_pad_do_checkgetrange (GstPad * pad)
gboolean result;
GstPad *internal = gst_proxy_pad_get_internal (pad);
g_return_val_if_fail (internal != NULL, FALSE);
result = gst_pad_check_pull_range (internal);
gst_object_unref (internal);
@ -332,6 +321,7 @@ gst_proxy_pad_set_target_unlocked (GstPad * pad, GstPad * target)
return TRUE;
/* ERRORS */
wrong_direction:
{
GST_ERROR_OBJECT (pad,
@ -422,6 +412,7 @@ gst_proxy_pad_init (GstProxyPad * ppad)
gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_proxy_pad_do_query));
gst_pad_set_internal_link_function (pad,
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_internal_link));
gst_pad_set_getcaps_function (pad,
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_getcaps));
gst_pad_set_acceptcaps_function (pad,
@ -430,7 +421,6 @@ gst_proxy_pad_init (GstProxyPad * ppad)
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_fixatecaps));
gst_pad_set_setcaps_function (pad,
GST_DEBUG_FUNCPTR (gst_proxy_pad_do_setcaps));
}
#ifndef GST_DISABLE_LOADSAVE
@ -510,33 +500,57 @@ gst_critical (const gchar * format, ...)
* _ the internal and target are unlinked as soon as the GhostPad is removed
* from it's parent.
*/
static void
gst_ghost_pad_parent_set (GstObject * object, GstObject * parent)
{
GstPad *gpad = GST_PAD (object);
GstPad *target = gst_proxy_pad_get_target (gpad);
GstPad *internal = gst_proxy_pad_get_internal (gpad);
GstPad *gpad;
GstPad *target;
GstPad *internal;
GstPadLinkReturn ret;
gpad = GST_PAD (object);
/* internal is never NULL */
internal = gst_proxy_pad_get_internal (gpad);
target = gst_proxy_pad_get_target (gpad);
if (target) {
if (GST_PAD_IS_SRC (internal))
gst_pad_link (internal, target);
ret = gst_pad_link (internal, target);
else
gst_pad_link (target, internal);
ret = gst_pad_link (target, internal);
gst_object_unref (target);
if (ret != GST_PAD_LINK_OK)
goto link_failed;
}
gst_object_unref (internal);
if (GST_OBJECT_CLASS (gst_ghost_pad_parent_class)->parent_set)
GST_OBJECT_CLASS (gst_ghost_pad_parent_class)->parent_set (object, parent);
return;
/* ERRORS */
link_failed:
{
/* a warning is all we can do */
gst_object_unref (internal);
g_warning ("could not link internal ghostpad");
return;
}
}
static void
gst_ghost_pad_parent_unset (GstObject * object, GstObject * parent)
{
GstPad *gpad = GST_PAD (object);
GstPad *target = gst_proxy_pad_get_target (gpad);
GstPad *internal = gst_proxy_pad_get_internal (gpad);
GstPad *gpad;
GstPad *target;
GstPad *internal;
gpad = GST_PAD (object);
internal = gst_proxy_pad_get_internal (gpad);
target = gst_proxy_pad_get_target (gpad);
if (target) {
if (GST_PAD_IS_SRC (internal))
@ -570,29 +584,18 @@ static gboolean
gst_ghost_pad_internal_do_activate_push (GstPad * pad, gboolean active)
{
gboolean ret;
GstPad *other;
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
GstPad *parent = gst_proxy_pad_get_internal (pad);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK)
other = gst_proxy_pad_get_internal (pad);
else
other = gst_pad_get_peer (pad);
if (parent) {
g_return_val_if_fail (GST_IS_GHOST_PAD (parent), FALSE);
ret = gst_pad_activate_push (parent, active);
gst_object_unref (parent);
} else {
ret = FALSE;
}
} else {
GstPad *peer = gst_pad_get_peer (pad);
if (peer) {
ret = gst_pad_activate_push (peer, active);
gst_object_unref (peer);
} else {
ret = FALSE;
}
}
if (G_LIKELY (other)) {
ret = gst_pad_activate_push (other, active);
gst_object_unref (other);
} else
ret = FALSE;
return ret;
}
@ -601,29 +604,18 @@ static gboolean
gst_ghost_pad_internal_do_activate_pull (GstPad * pad, gboolean active)
{
gboolean ret;
GstPad *other;
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
GstPad *peer = gst_pad_get_peer (pad);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK)
other = gst_pad_get_peer (pad);
else
other = gst_proxy_pad_get_internal (pad);
if (peer) {
ret = gst_pad_activate_pull (peer, active);
gst_object_unref (peer);
} else {
ret = FALSE;
}
} else {
GstPad *parent = gst_proxy_pad_get_internal (pad);
if (parent) {
g_return_val_if_fail (GST_IS_GHOST_PAD (parent), FALSE);
ret = gst_pad_activate_pull (parent, active);
gst_object_unref (parent);
} else {
ret = FALSE;
}
}
if (G_LIKELY (other)) {
ret = gst_pad_activate_pull (other, active);
gst_object_unref (other);
} else
ret = FALSE;
return ret;
}
@ -633,19 +625,16 @@ gst_ghost_pad_do_activate_push (GstPad * pad, gboolean active)
{
gboolean ret;
ret = TRUE;
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
GstPad *internal = gst_proxy_pad_get_internal (pad);
if (internal) {
ret = gst_pad_activate_push (internal, active);
gst_object_unref (internal);
} else {
ret = TRUE;
}
} else {
ret = TRUE;
}
return ret;
}
@ -653,26 +642,18 @@ static gboolean
gst_ghost_pad_do_activate_pull (GstPad * pad, gboolean active)
{
gboolean ret;
GstPad *other;
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
GstPad *peer = gst_pad_get_peer (pad);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK)
other = gst_pad_get_peer (pad);
else
other = gst_proxy_pad_get_internal (pad);
if (peer) {
ret = gst_pad_activate_pull (peer, active);
gst_object_unref (peer);
} else {
ret = FALSE;
}
} else {
GstPad *internal = gst_proxy_pad_get_internal (pad);
if (internal) {
ret = gst_pad_activate_pull (internal, active);
gst_object_unref (internal);
} else {
ret = FALSE;
}
}
if (G_LIKELY (other)) {
ret = gst_pad_activate_pull (other, active);
gst_object_unref (other);
} else
ret = FALSE;
return ret;
}
@ -680,44 +661,55 @@ gst_ghost_pad_do_activate_pull (GstPad * pad, gboolean active)
static GstPadLinkReturn
gst_ghost_pad_do_link (GstPad * pad, GstPad * peer)
{
GstPad *internal, *target;
GstPadLinkReturn ret = GST_PAD_LINK_OK;
GstPadLinkReturn ret;
GstPad *internal;
target = gst_proxy_pad_get_target (pad);
g_return_val_if_fail (target != NULL, GST_PAD_LINK_NOSCHED);
ret = GST_PAD_LINK_OK;
internal = gst_proxy_pad_get_internal (pad);
gst_proxy_pad_set_target (internal, peer);
if (!gst_proxy_pad_set_target (internal, peer))
goto failed;
/* if we are a source pad, we should call the peer link function
* if the peer has one */
if (GST_PAD_IS_SRC (pad)) {
if (GST_PAD_LINKFUNC (peer) && ret == GST_PAD_LINK_OK)
if (GST_PAD_LINKFUNC (peer))
ret = GST_PAD_LINKFUNC (peer) (peer, pad);
}
gst_object_unref (target);
done:
gst_object_unref (internal);
return ret;
/* ERRORS */
failed:
{
ret = GST_PAD_LINK_REFUSED;
goto done;
}
}
static void
gst_ghost_pad_do_unlink (GstPad * pad)
{
GstPad *target = gst_proxy_pad_get_target (pad);
GstPad *internal = gst_proxy_pad_get_internal (pad);
GstPad *target;
GstPad *internal;
target = gst_proxy_pad_get_target (pad);
internal = gst_proxy_pad_get_internal (pad);
GST_DEBUG_OBJECT (pad, "unlinking ghostpad");
/* The target of the internal pad is no longer valid */
gst_proxy_pad_set_target (internal, NULL);
if (target && target->unlinkfunc)
target->unlinkfunc (target);
if (target) {
if (GST_PAD_UNLINKFUNC (target))
GST_PAD_UNLINKFUNC (target) (target);
if (target)
gst_object_unref (target);
}
gst_object_unref (internal);
}
@ -771,9 +763,9 @@ gst_ghost_pad_dispose (GObject * object)
}
GST_PROXY_PAD_INTERNAL (internal) = NULL;
/*
disposes of the internal pad, since the ghostpad is the only possible object
that has a refcount on the internal pad.
/* disposes of the internal pad, since the ghostpad is the only possible object
* that has a refcount on the internal pad.
*/
gst_object_unparent (GST_OBJECT_CAST (internal));
@ -819,7 +811,6 @@ gst_ghost_pad_new_full (const gchar * name, GstPadDirection dir,
/* INTERNAL PAD */
internal =
g_object_new (GST_TYPE_PROXY_PAD, "name", NULL,
"direction", (dir == GST_PAD_SRC) ? GST_PAD_SINK : GST_PAD_SRC, NULL);
@ -840,37 +831,45 @@ gst_ghost_pad_new_full (const gchar * name, GstPadDirection dir,
GST_PROXY_LOCK (ret);
if (!gst_object_set_parent (GST_OBJECT_CAST (internal),
GST_OBJECT_CAST (ret))) {
gst_critical ("Could not set internal pad%" GST_PTR_FORMAT, internal);
goto beach;
}
GST_OBJECT_CAST (ret)))
goto parent_failed;
/*
The ghostpad is the parent of the internal pad and is the only object that
can have a refcount on the internal pad.
At this point, the GstGhostPad has a refcount of 1, and the internal pad has
a refcount of 1.
When the refcount of the GstGhostPad drops to 0, the ghostpad will dispose
it's refcount on the internal pad in the dispose method by un-parenting it.
This is why we don't take extra refcounts in the assignments below
/* The ghostpad is the parent of the internal pad and is the only object that
* can have a refcount on the internal pad.
* At this point, the GstGhostPad has a refcount of 1, and the internal pad has
* a refcount of 1.
* When the refcount of the GstGhostPad drops to 0, the ghostpad will dispose
* it's refcount on the internal pad in the dispose method by un-parenting it.
* This is why we don't take extra refcounts in the assignments below
*/
GST_PROXY_PAD_INTERNAL (ret) = internal;
GST_PROXY_PAD_INTERNAL (internal) = GST_PAD (ret);
GST_PROXY_PAD_INTERNAL (internal) = ret;
/* could be more general here, iterating over all writable properties...
* taking the short road for now tho */
GST_GHOST_PAD (ret)->notify_id = g_signal_connect (internal, "notify::caps",
G_CALLBACK (on_int_notify), ret);
on_int_notify (internal, NULL, GST_GHOST_PAD (ret));
GST_GHOST_PAD_CAST (ret)->notify_id =
g_signal_connect (internal, "notify::caps", G_CALLBACK (on_int_notify),
ret);
/* call function to init values */
on_int_notify (internal, NULL, GST_GHOST_PAD_CAST (ret));
gst_pad_set_activatepull_function (GST_PAD (internal),
GST_DEBUG_FUNCPTR (gst_ghost_pad_internal_do_activate_pull));
gst_pad_set_activatepush_function (GST_PAD (internal),
GST_DEBUG_FUNCPTR (gst_ghost_pad_internal_do_activate_push));
beach:
GST_PROXY_UNLOCK (ret);
return ret;
/* ERRORS */
parent_failed:
{
gst_critical ("Could not set internal pad %" GST_PTR_FORMAT, internal);
GST_PROXY_UNLOCK (ret);
gst_object_unref (ret);
return NULL;
}
}
/**
@ -979,13 +978,12 @@ set_target_failed:
* @templ: the #GstPadTemplate to create the ghostpad from.
*
* Create a new ghostpad based on @templ, without setting a target. The
* direction will be taken from @templ.
* direction will be taken from the @templ.
*
* Returns: a new #GstPad, or NULL in case of an error.
*
* Since: 0.10.10
*/
GstPad *
gst_ghost_pad_new_no_target_from_template (const gchar * name,
GstPadTemplate * templ)
@ -1034,11 +1032,12 @@ gst_ghost_pad_set_target (GstGhostPad * gpad, GstPad * newtarget)
GstPad *oldtarget;
GstObject *parent;
gboolean result;
GstPadLinkReturn lret;
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), FALSE);
GST_PROXY_LOCK (gpad);
internal = GST_PROXY_PAD_INTERNAL (GST_PAD (gpad));
internal = GST_PROXY_PAD_INTERNAL (GST_PAD_CAST (gpad));
GST_DEBUG_OBJECT (gpad, "set target %s:%s", GST_DEBUG_PAD_NAME (newtarget));
@ -1059,9 +1058,13 @@ gst_ghost_pad_set_target (GstGhostPad * gpad, GstPad * newtarget)
/* and link to internal pad if we are not unparent-ed */
if ((parent = gst_object_get_parent (GST_OBJECT (gpad)))) {
if (GST_PAD_IS_SRC (internal))
result = gst_pad_link (internal, newtarget);
lret = gst_pad_link (internal, newtarget);
else
result = gst_pad_link (newtarget, internal);
lret = gst_pad_link (newtarget, internal);
/* FIXME, do something with lret, possibly checking the return value and
* undoing the set_target operation if it failed */
gst_object_unref (parent);
} else {
/* we need to connect the internal pad once we have a parent */

80
tests/check/gst/gstghostpad.c
View file

@ -148,17 +148,26 @@ GST_START_TEST (test_remove2)
GST_END_TEST;
#if 0
/* test if a ghost pad without a target can be linked
* It can't because it has incompatible caps...
/* test if a ghost pad without a target can be linked and
* unlinked. An untargeted ghostpad has a default ANY caps unless there
* is a padtemplate that says something else.
*/
GST_START_TEST (test_ghost_pad_notarget)
GST_START_TEST (test_ghost_pads_notarget)
{
GstElement *b1, *b2, *sink;
GstPad *srcpad, *sinkpad;
GstPad *srcpad, *sinkpad, *peer;
GstPadLinkReturn ret;
gboolean bret;
GstBus *bus;
GstCaps *caps;
b1 = gst_element_factory_make ("pipeline", NULL);
/* make sure all messages are discarded */
bus = gst_pipeline_get_bus (GST_PIPELINE (b1));
gst_bus_set_flushing (bus, TRUE);
gst_object_unref (bus);
b2 = gst_element_factory_make ("bin", NULL);
sink = gst_element_factory_make ("fakesink", NULL);
@ -172,10 +181,33 @@ GST_START_TEST (test_ghost_pad_notarget)
ret = gst_pad_link (srcpad, sinkpad);
fail_unless (ret == GST_PAD_LINK_OK);
/* check if the peers are ok */
peer = gst_pad_get_peer (srcpad);
fail_unless (peer == sinkpad);
gst_object_unref (peer);
peer = gst_pad_get_peer (sinkpad);
fail_unless (peer == srcpad);
gst_object_unref (peer);
/* check caps, untargetted pad should return ANY or the padtemplate caps
* when it was created from a template */
caps = gst_pad_get_caps (srcpad);
fail_unless (gst_caps_is_any (caps));
gst_caps_unref (caps);
/* unlink */
bret = gst_pad_unlink (srcpad, sinkpad);
fail_unless (bret == TRUE);
/* cleanup */
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
gst_object_unref (b1);
}
GST_END_TEST;
#endif
/* test if linking fails over different bins using a pipeline
* like this:
@ -225,6 +257,10 @@ GST_START_TEST (test_link)
gst_element_set_state (b1, GST_STATE_READY);
gst_element_set_state (b1, GST_STATE_NULL);
ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
gst_object_unref (b1);
}
GST_END_TEST;
@ -345,8 +381,8 @@ GST_START_TEST (test_ghost_pads_bin)
GstBin *sinkbin;
GstElement *src;
GstElement *sink;
GstPad *srcghost;
GstPad *sinkghost;
GstPad *srcpad, *srcghost, *target;
GstPad *sinkpad, *sinkghost;
pipeline = GST_BIN (gst_pipeline_new ("pipe"));
ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
@ -361,27 +397,35 @@ GST_START_TEST (test_ghost_pads_bin)
src = gst_element_factory_make ("fakesrc", "src");
gst_bin_add (srcbin, src);
srcghost = gst_ghost_pad_new ("src", gst_element_get_pad (src, "src"));
srcpad = gst_element_get_pad (src, "src");
srcghost = gst_ghost_pad_new ("src", srcpad);
gst_object_unref (srcpad);
gst_element_add_pad (GST_ELEMENT (srcbin), srcghost);
sink = gst_element_factory_make ("fakesink", "sink");
gst_bin_add (sinkbin, sink);
sinkghost = gst_ghost_pad_new ("sink", gst_element_get_pad (sink, "sink"));
sinkpad = gst_element_get_pad (sink, "sink");
sinkghost = gst_ghost_pad_new ("sink", sinkpad);
gst_object_unref (sinkpad);
gst_element_add_pad (GST_ELEMENT (sinkbin), sinkghost);
gst_element_link (GST_ELEMENT (srcbin), GST_ELEMENT (sinkbin));
fail_unless (GST_PAD_PEER (srcghost) != NULL);
fail_unless (GST_PAD_PEER (sinkghost) != NULL);
fail_unless (GST_PAD_PEER (gst_ghost_pad_get_target (GST_GHOST_PAD
(srcghost))) != NULL);
fail_unless (GST_PAD_PEER (gst_ghost_pad_get_target (GST_GHOST_PAD
(sinkghost))) != NULL);
target = gst_ghost_pad_get_target (GST_GHOST_PAD (srcghost));
fail_unless (GST_PAD_PEER (target) != NULL);
gst_object_unref (target);
target = gst_ghost_pad_get_target (GST_GHOST_PAD (sinkghost));
fail_unless (GST_PAD_PEER (target) != NULL);
gst_object_unref (target);
/* flush the message, dropping the b1 refcount to 1 */
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_READY);
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
gst_object_unref (pipeline);
}
GST_END_TEST;
@ -437,6 +481,9 @@ GST_START_TEST (test_ghost_pads_block)
g_mutex_free (block_data.mutex);
g_cond_free (block_data.cond);
ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
gst_object_unref (pipeline);
}
GST_END_TEST;
@ -475,6 +522,9 @@ GST_START_TEST (test_ghost_pads_probes)
g_mutex_free (block_data.mutex);
g_cond_free (block_data.cond);
ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
gst_object_unref (pipeline);
}
GST_END_TEST;
@ -569,7 +619,7 @@ gst_ghost_pad_suite (void)
tcase_add_test (tc_chain, test_link);
tcase_add_test (tc_chain, test_ghost_pads);
tcase_add_test (tc_chain, test_ghost_pads_bin);
/* tcase_add_test (tc_chain, test_ghost_pad_notarget); */
tcase_add_test (tc_chain, test_ghost_pads_notarget);
tcase_add_test (tc_chain, test_ghost_pads_block);
tcase_add_test (tc_chain, test_ghost_pads_probes);
tcase_add_test (tc_chain, test_ghost_pads_new_from_template);