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gstreamer/gst-libs/gst/insertbin/gstinsertbin.c
Olivier Crête d0524c0579 insertbin: Annotate callback scopes
2013-05-15 20:03:30 -04:00

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/*
* GStreamer
*
* Copyright 2013 Collabora Ltd
* @author: Olivier Crete <olivier.crete@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/**
* SECTION:gstinsertbin
* @short_description: A #GstBin to insertally link filter-like elements.
*
* This element is a #GstBin that has a single source and sink pad. It allows
* the user (the application) to easily add and remove filter-like element
* (that has a single source and sink pad), to the pipeline while it is running.
* It features a fully asynchronous API inspired by GLib's GAsyncResult based
* APIs.
*
* Each operation (addition or removal) can take a callback, this callback
* is guaranteed to be called. Unlike GIO, there is no guarantee about where
* this callback will be called from, it could be called before the action
* returns or it could be called later from another thread. The signature of
* this callback GstInsertBinCallback().
*
* Since: 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstinsertbin.h"
GST_DEBUG_CATEGORY_STATIC (insert_bin_debug);
#define GST_CAT_DEFAULT (insert_bin_debug)
static GstStaticPadTemplate gst_insert_bin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_insert_bin_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
enum
{
SIG_PREPEND,
SIG_APPEND,
SIG_INSERT_BEFORE,
SIG_INSERT_AFTER,
SIG_REMOVE,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
enum
{
PROP_0,
};
struct _GstInsertBinPrivate
{
GstPad *srcpad;
GstPad *sinkpad;
GQueue change_queue;
};
typedef enum
{
GST_INSERT_BIN_ACTION_ADD,
GST_INSERT_BIN_ACTION_REMOVE
} GstInsertBinAction;
typedef enum
{
DIRECTION_NONE,
DIRECTION_AFTER,
DIRECTION_BEFORE
} GstInsertBinDirection;
struct ChangeData
{
GstElement *element;
GstInsertBinAction action;
GstElement *sibling;
GstInsertBinDirection direction;
GstInsertBinCallback callback;
gpointer user_data;
};
static void gst_insert_bin_dispose (GObject * object);
static void gst_insert_bin_do_change (GstInsertBin * self, GstPad * pad);
static GstPadProbeReturn pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data);
G_DEFINE_TYPE (GstInsertBin, gst_insert_bin, GST_TYPE_BIN);
static void
gst_insert_bin_class_init (GstInsertBinClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = (GstElementClass *) klass;
GST_DEBUG_CATEGORY_INIT (insert_bin_debug, "insertbin", 0, "Insert Bin");
g_type_class_add_private (klass, sizeof (GstInsertBinPrivate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_insert_bin_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_insert_bin_sink_template));
gst_element_class_set_static_metadata (gstelement_class, "Insert Bin",
"Generic/Bin/Filter",
"Auto-links filter style elements insertally",
"Olivier Crete <olivier.crete@collabora.com>");
gobject_class->dispose = gst_insert_bin_dispose;
/**
* GstInsertBin::prepend:
* @element: the #GstElement to add
* @callback: the callback to call when the element has been added or not, or
* %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element before any other element
* in the bin.
*
* Same as gst_insert_bin_prepend()
*/
signals[SIG_PREPEND] = g_signal_new_class_handler ("prepend",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_insert_bin_prepend),
NULL, NULL, NULL,
G_TYPE_NONE, 3, GST_TYPE_ELEMENT, G_TYPE_POINTER, G_TYPE_POINTER);
/**
* GstInsertBin::append:
* @element: the #GstElement to add
* @callback: the callback to call when the element has been added or not, or
* %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element after any other element
* in the bin.
*
* Same as gst_insert_bin_append()
*/
signals[SIG_APPEND] = g_signal_new_class_handler ("append",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_insert_bin_append),
NULL, NULL, NULL,
G_TYPE_NONE, 3, GST_TYPE_ELEMENT, G_TYPE_POINTER, G_TYPE_POINTER);
/**
* GstInsertBin::insert-before:
* @element: the #GstElement to add
* @sibling: the #GstElement to add @element before
* @callback: the callback to call when the element has been added or not, or
* %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element before the @sibling
* element in the bin.
*
* Same as gst_insert_bin_insert_before()
*/
signals[SIG_INSERT_BEFORE] = g_signal_new_class_handler ("insert-before",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_insert_bin_insert_before),
NULL, NULL, NULL,
G_TYPE_NONE, 4, GST_TYPE_ELEMENT, GST_TYPE_ELEMENT,
G_TYPE_POINTER, G_TYPE_POINTER);
/**
* GstInsertBin::insert-after:
* @element: the #GstElement to add
* @sibling: the #GstElement to add @element after
* @callback: the callback to call when the element has been added or not, or
* %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element after the @sibling
* element in the bin.
* element in the bin.
*
* Same as gst_insert_bin_insert_after()
*/
signals[SIG_INSERT_AFTER] = g_signal_new_class_handler ("insert-after",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_insert_bin_insert_after),
NULL, NULL, NULL,
G_TYPE_NONE, 4, GST_TYPE_ELEMENT, GST_TYPE_ELEMENT,
G_TYPE_POINTER, G_TYPE_POINTER);
/**
* GstInsertBin::remove:
* @element: the #GstElement to remove
* @callback: the callback to call when the element has been removed or not,
* or %NULL
* @user_data: The data to pass to the callback
*
* This action signal removed the filter like element from the bin.
*
* Same as gst_insert_bin_remove()
*/
signals[SIG_REMOVE] = g_signal_new_class_handler ("remove",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gst_insert_bin_remove),
NULL, NULL, NULL,
G_TYPE_NONE, 3, GST_TYPE_ELEMENT, G_TYPE_POINTER, G_TYPE_POINTER);
}
static void
change_data_free (struct ChangeData *data)
{
gst_object_unref (data->element);
if (data->sibling)
gst_object_unref (data->sibling);
g_slice_free (struct ChangeData, data);
}
static void
gst_insert_bin_change_data_complete (GstInsertBin * self,
struct ChangeData *data, gboolean success)
{
if (data->callback)
data->callback (self, data->element, success, data->user_data);
change_data_free (data);
}
static void
gst_insert_bin_init (GstInsertBin * self)
{
GstProxyPad *internal;
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GST_TYPE_INSERT_BIN,
GstInsertBinPrivate);
g_queue_init (&self->priv->change_queue);
self->priv->sinkpad = gst_ghost_pad_new_no_target_from_template ("sink",
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (self),
"sink"));
gst_element_add_pad (GST_ELEMENT (self), self->priv->sinkpad);
internal = gst_proxy_pad_get_internal (GST_PROXY_PAD (self->priv->sinkpad));
self->priv->srcpad = gst_ghost_pad_new_from_template ("src",
GST_PAD (internal),
gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (self), "src"));
gst_object_unref (internal);
gst_element_add_pad (GST_ELEMENT (self), self->priv->srcpad);
}
static void
gst_insert_bin_dispose (GObject * object)
{
GstInsertBin *self = GST_INSERT_BIN (object);
struct ChangeData *data;
while ((data = g_queue_pop_head (&self->priv->change_queue)))
gst_insert_bin_change_data_complete (self, data, FALSE);
gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->srcpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->sinkpad), NULL);
G_OBJECT_CLASS (gst_insert_bin_parent_class)->dispose (object);
}
static gboolean
validate_element (GstInsertBin * self, GstElement * element)
{
gboolean valid = TRUE;;
GST_OBJECT_LOCK (element);
if (element->numsrcpads != 1 || element->numsinkpads != 1) {
GST_WARNING_OBJECT (self,
"Element does not have a single src and sink pad");
valid = FALSE;
}
if (GST_OBJECT_PARENT (element) != NULL) {
GST_WARNING_OBJECT (self, "Element already has a parent");
valid = FALSE;
}
GST_OBJECT_UNLOCK (element);
return valid;
}
static GstPad *
get_single_pad (GstElement * element, GstPadDirection direction)
{
GstPad *pad = NULL;
GST_OBJECT_LOCK (element);
if (direction == GST_PAD_SRC) {
if (element->numsrcpads == 1)
pad = element->srcpads->data;
} else {
if (element->numsinkpads == 1)
pad = element->sinkpads->data;
}
if (pad)
gst_object_ref (pad);
GST_OBJECT_UNLOCK (element);
return pad;
}
static gboolean
is_right_direction_for_block (GstPad * pad)
{
gboolean right_direction;
GST_OBJECT_LOCK (pad);
switch (pad->mode) {
case GST_PAD_MODE_NONE:
right_direction = TRUE;
break;
case GST_PAD_MODE_PUSH:
right_direction = (pad->direction == GST_PAD_SRC);
break;
case GST_PAD_MODE_PULL:
right_direction = (pad->direction == GST_PAD_SINK);
break;
default:
right_direction = FALSE;
g_assert_not_reached ();
}
GST_OBJECT_UNLOCK (pad);
return right_direction;
}
static void
gst_insert_bin_block_pad_unlock (GstInsertBin * self)
{
struct ChangeData *data;
GstPad *pad;
GstPadProbeType probetype;
again:
data = g_queue_peek_head (&self->priv->change_queue);
if (!data) {
GST_OBJECT_UNLOCK (self);
return;
}
if (data->action == GST_INSERT_BIN_ACTION_ADD &&
!validate_element (self, data->element))
goto error;
if (data->action == GST_INSERT_BIN_ACTION_ADD) {
if (data->sibling) {
if (data->direction == DIRECTION_BEFORE)
pad = get_single_pad (data->sibling, GST_PAD_SINK);
else
pad = get_single_pad (data->sibling, GST_PAD_SRC);
} else {
if (data->direction == DIRECTION_BEFORE)
pad = (GstPad *)
gst_proxy_pad_get_internal (GST_PROXY_PAD (self->priv->srcpad));
else
pad = (GstPad *)
gst_proxy_pad_get_internal (GST_PROXY_PAD (self->priv->sinkpad));
}
if (!pad) {
GST_WARNING_OBJECT (self, "Can not obtain a sibling pad to block"
" before adding");
goto error;
}
if (!is_right_direction_for_block (pad)) {
GstPad *peer = gst_pad_get_peer (pad);
if (peer) {
gst_object_unref (pad);
pad = peer;
}
}
} else {
GstPad *element_pad;
element_pad = get_single_pad (data->element, GST_PAD_SINK);
if (!element_pad) {
GST_WARNING_OBJECT (self, "Can not obtain the element's sink pad");
goto error;
}
if (!is_right_direction_for_block (element_pad)) {
pad = gst_pad_get_peer (element_pad);
} else {
gst_object_unref (element_pad);
element_pad = get_single_pad (data->element, GST_PAD_SRC);
if (!element_pad) {
GST_WARNING_OBJECT (self, "Can not obtain the element's src pad");
goto error;
}
pad = gst_pad_get_peer (element_pad);
}
gst_object_unref (element_pad);
if (!pad) {
GST_WARNING_OBJECT (self, "Can not obtain a sibling pad for removing");
goto error;
}
}
if (GST_PAD_IS_SRC (pad))
probetype = GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM;
else
probetype = GST_PAD_PROBE_TYPE_BLOCK_UPSTREAM;
GST_OBJECT_UNLOCK (self);
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_IDLE | probetype, pad_blocked_cb,
self, NULL);
gst_object_unref (pad);
return;
error:
g_queue_pop_head (&self->priv->change_queue);
gst_insert_bin_change_data_complete (self, data, FALSE);
goto again;
}
static GstPadProbeReturn
wait_and_drop_eos_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstPad *peer;
if (GST_EVENT_TYPE (GST_PAD_PROBE_INFO_EVENT (info)) != GST_EVENT_EOS)
return GST_PAD_PROBE_PASS;
peer = gst_pad_get_peer (pad);
if (peer) {
gst_pad_unlink (pad, peer);
gst_object_unref (peer);
}
return GST_PAD_PROBE_DROP;
}
static void
gst_insert_bin_do_change (GstInsertBin * self, GstPad * pad)
{
struct ChangeData *data;
GST_OBJECT_LOCK (self);
if (!is_right_direction_for_block (pad)) {
GST_WARNING_OBJECT (self, "Block pad does not have the expected direction");
goto next;
}
while ((data = g_queue_pop_head (&self->priv->change_queue)) != NULL) {
GstPad *peer = NULL;
GstPad *other_peer = NULL;
GST_OBJECT_UNLOCK (self);
if (data->action == GST_INSERT_BIN_ACTION_ADD &&
!validate_element (self, data->element))
goto error;
peer = gst_pad_get_peer (pad);
if (peer == NULL) {
GST_WARNING_OBJECT (self, "Blocked pad has no peer");
goto error;
}
if (data->action == GST_INSERT_BIN_ACTION_ADD) {
GstPad *srcpad = NULL, *sinkpad = NULL;
GstPad *peersrcpad, *peersinkpad;
/* First let's make sure we have the right pad */
if (data->sibling) {
GstElement *parent = NULL;
GstPad *siblingpad;
if ((gst_pad_get_direction (pad) == GST_PAD_SRC &&
data->direction == DIRECTION_BEFORE) ||
(gst_pad_get_direction (pad) == GST_PAD_SINK &&
data->direction == DIRECTION_AFTER))
siblingpad = peer;
else
siblingpad = pad;
parent = gst_pad_get_parent_element (siblingpad);
if (parent != NULL)
gst_object_unref (parent);
if (parent != data->sibling)
goto retry;
} else {
GstObject *parent;
GstPad *ghost;
GstPad *proxypad;
if (data->direction == DIRECTION_BEFORE) {
ghost = self->priv->srcpad;
if (gst_pad_get_direction (pad) == GST_PAD_SINK)
proxypad = pad;
else
proxypad = peer;
} else {
ghost = self->priv->sinkpad;
if (gst_pad_get_direction (pad) == GST_PAD_SINK)
proxypad = peer;
else
proxypad = pad;
}
if (!GST_IS_PROXY_PAD (proxypad))
goto retry;
parent = gst_pad_get_parent (proxypad);
if (!parent)
goto retry;
gst_object_unref (parent);
if (GST_PAD_CAST (parent) != ghost)
goto retry;
}
if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
peersrcpad = pad;
peersinkpad = peer;
} else {
peersrcpad = peer;
peersinkpad = pad;
}
if (GST_IS_PROXY_PAD (peersrcpad)) {
GstObject *parent = gst_pad_get_parent (peersrcpad);
if (GST_PAD_CAST (parent) == self->priv->sinkpad)
peersrcpad = NULL;
if (parent)
gst_object_unref (parent);
}
if (GST_IS_PROXY_PAD (peersinkpad)) {
GstObject *parent = gst_pad_get_parent (peersinkpad);
if (GST_PAD_CAST (parent) == self->priv->srcpad)
peersinkpad = NULL;
if (parent)
gst_object_unref (parent);
}
if (peersinkpad && peersrcpad) {
gst_pad_unlink (peersrcpad, peersinkpad);
} else {
if (!peersinkpad)
gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->srcpad), NULL);
if (!peersrcpad)
gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->sinkpad), NULL);
}
srcpad = get_single_pad (data->element, GST_PAD_SRC);
sinkpad = get_single_pad (data->element, GST_PAD_SINK);
if (srcpad == NULL || sinkpad == NULL) {
GST_WARNING_OBJECT (self, "Can not get element src or sink pad");
goto error;
}
if (!gst_bin_add (GST_BIN (self), data->element)) {
GST_WARNING_OBJECT (self, "Can not add element to bin");
goto error;
}
if (peersrcpad) {
if (GST_PAD_LINK_FAILED (gst_pad_link (peersrcpad, sinkpad))) {
GST_WARNING_OBJECT (self, "Can not link sibling's %s:%s pad"
" to element's %s:%s pad", GST_DEBUG_PAD_NAME (peersrcpad),
GST_DEBUG_PAD_NAME (sinkpad));
goto error;
}
} else {
if (!gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->sinkpad),
sinkpad)) {
GST_WARNING_OBJECT (self, "Can not set %s:%s as target for %s:%s",
GST_DEBUG_PAD_NAME (sinkpad),
GST_DEBUG_PAD_NAME (self->priv->sinkpad));
goto error;
}
}
if (peersinkpad) {
if (GST_PAD_LINK_FAILED (gst_pad_link (srcpad, peersinkpad))) {
GST_WARNING_OBJECT (self, "Can not link element's %s:%s pad"
" to sibling's %s:%s pad", GST_DEBUG_PAD_NAME (srcpad),
GST_DEBUG_PAD_NAME (peersinkpad));
goto error;
}
} else {
if (!gst_ghost_pad_set_target (GST_GHOST_PAD (self->priv->srcpad),
srcpad)) {
GST_WARNING_OBJECT (self, "Can not set %s:%s as target for %s:%s",
GST_DEBUG_PAD_NAME (srcpad),
GST_DEBUG_PAD_NAME (self->priv->srcpad));
goto error;
}
}
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
if (!gst_element_sync_state_with_parent (data->element)) {
GST_WARNING_OBJECT (self, "Can not sync element's state with parent");
goto error;
}
} else {
GstElement *parent = NULL;
GstPad *other_pad;
GstCaps *caps = NULL, *peercaps = NULL;
gboolean can_intersect;
gboolean success;
parent = gst_pad_get_parent_element (peer);
if (parent != NULL)
gst_object_unref (parent);
if (parent != data->element)
goto retry;
if (gst_pad_get_direction (peer) == GST_PAD_SRC)
other_pad = get_single_pad (data->element, GST_PAD_SINK);
else
other_pad = get_single_pad (data->element, GST_PAD_SRC);
if (!other_pad) {
GST_WARNING_OBJECT (self, "Can not get element's other pad");
goto error;
}
other_peer = gst_pad_get_peer (other_pad);
gst_object_unref (other_pad);
if (!other_peer) {
GST_WARNING_OBJECT (self, "Can not get element's other peer");
goto error;
}
/* Get the negotiated caps for the source pad peer,
* because renegotiation while the pipeline is playing doesn't work
* that fast.
*/
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
caps = gst_pad_get_current_caps (pad);
else
peercaps = gst_pad_get_current_caps (other_peer);
if (!caps)
caps = gst_pad_query_caps (pad, NULL);
if (!peercaps)
peercaps = gst_pad_query_caps (other_peer, NULL);
can_intersect = gst_caps_can_intersect (caps, peercaps);
gst_caps_unref (caps);
gst_caps_unref (peercaps);
if (!can_intersect) {
GST_WARNING_OBJECT (self, "Pads are incompatible without the element");
goto error;
}
if (gst_pad_get_direction (other_peer) == GST_PAD_SRC &&
gst_pad_is_active (other_peer)) {
gulong probe_id;
probe_id = gst_pad_add_probe (other_peer,
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
wait_and_drop_eos_cb, NULL, NULL);
gst_pad_send_event (peer, gst_event_new_eos ());
gst_pad_remove_probe (other_peer, probe_id);
}
gst_element_set_locked_state (data->element, TRUE);
gst_element_set_state (data->element, GST_STATE_NULL);
if (!gst_bin_remove (GST_BIN (self), data->element)) {
GST_WARNING_OBJECT (self, "Element removal rejected");
goto error;
}
gst_element_set_locked_state (data->element, FALSE);
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
success = GST_PAD_LINK_SUCCESSFUL (gst_pad_link_full (pad, other_peer,
GST_PAD_LINK_CHECK_HIERARCHY |
GST_PAD_LINK_CHECK_TEMPLATE_CAPS));
else
success = GST_PAD_LINK_SUCCESSFUL (gst_pad_link_full (other_peer, pad,
GST_PAD_LINK_CHECK_HIERARCHY |
GST_PAD_LINK_CHECK_TEMPLATE_CAPS));
gst_object_unref (other_peer);
other_peer = NULL;
if (!success) {
GST_ERROR_OBJECT (self, "Could not re-link after the element's"
" removal");
goto error;
}
}
gst_insert_bin_change_data_complete (self, data, TRUE);
gst_object_unref (peer);
GST_OBJECT_LOCK (self);
continue;
done:
if (other_peer != NULL)
gst_object_unref (other_peer);
if (peer != NULL)
gst_object_unref (peer);
break;
retry:
GST_OBJECT_LOCK (self);
g_queue_push_head (&self->priv->change_queue, data);
goto done;
error:
/* Handle error */
gst_insert_bin_change_data_complete (self, data, FALSE);
GST_OBJECT_LOCK (self);
goto done;
}
next:
gst_insert_bin_block_pad_unlock (self);
}
static GstPadProbeReturn
pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstInsertBin *self = GST_INSERT_BIN (user_data);
g_assert (GST_PAD_PROBE_INFO_TYPE (info) &
(GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_IDLE));
gst_insert_bin_do_change (self, pad);
return GST_PAD_PROBE_REMOVE;
}
static void
gst_insert_bin_add_operation (GstInsertBin * self,
GstElement * element, GstInsertBinAction action, GstElement * sibling,
GstInsertBinDirection direction, GstInsertBinCallback callback,
gpointer user_data)
{
struct ChangeData *data = g_slice_new (struct ChangeData);
gboolean block_pad;
data->element = element;
data->action = action;
data->sibling = sibling;
if (data->sibling)
gst_object_ref (data->sibling);
data->direction = direction;
data->callback = callback;
data->user_data = user_data;
GST_OBJECT_LOCK (self);
block_pad = g_queue_is_empty (&self->priv->change_queue);
g_queue_push_tail (&self->priv->change_queue, data);
if (block_pad)
gst_insert_bin_block_pad_unlock (self);
else
GST_OBJECT_UNLOCK (self);
}
static void
gst_insert_bin_add (GstInsertBin * self, GstElement * element,
GstElement * sibling, GstInsertBinDirection direction,
GstInsertBinCallback callback, gpointer user_data)
{
gst_object_ref_sink (element);
if (!validate_element (self, element))
goto reject;
if (sibling) {
gboolean is_parent;
GST_OBJECT_LOCK (sibling);
is_parent = (GST_OBJECT_PARENT (sibling) == GST_OBJECT_CAST (self));
GST_OBJECT_UNLOCK (sibling);
if (!is_parent)
goto reject;
}
gst_insert_bin_add_operation (self, element, GST_INSERT_BIN_ACTION_ADD,
sibling, direction, callback, user_data);
return;
reject:
if (callback)
callback (self, element, FALSE, user_data);
gst_object_unref (element);
}
/**
* gst_insert_bin_prepend:
* @element: the #GstElement to add
* @callback: (scope async): the callback to call when the element has been
* added or not, or %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element before any other element
* in the bin.
*
* Same as the #GstInsertBin::prepend signal.
*
* Since: 1.2
*/
void
gst_insert_bin_prepend (GstInsertBin * self, GstElement * element,
GstInsertBinCallback callback, gpointer user_data)
{
g_return_if_fail (GST_IS_ELEMENT (element));
gst_insert_bin_add (self, element, NULL, DIRECTION_AFTER,
callback, user_data);
}
/**
* gst_insert_bin_append:
* @element: the #GstElement to add
* @callback: (scope async): the callback to call when the element has been
* added or not, or %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element after any other element
* in the bin.
*
* Same as the #GstInsertBin::append signal.
*
* Since: 1.2
*/
void
gst_insert_bin_append (GstInsertBin * self, GstElement * element,
GstInsertBinCallback callback, gpointer user_data)
{
g_return_if_fail (GST_IS_ELEMENT (element));
gst_insert_bin_add (self, element, NULL, DIRECTION_BEFORE,
callback, user_data);
}
/**
* gst_insert_bin_insert_before:
* @element: the #GstElement to add
* @sibling: the #GstElement to add @element before
* @callback: (scope async): the callback to call when the element has been
* added or not, or %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element before the @sibling
* element in the bin.
*
* Same as the #GstInsertBin::insert-before signal.
*
* Since: 1.2
*/
void
gst_insert_bin_insert_before (GstInsertBin * self, GstElement * element,
GstElement * sibling, GstInsertBinCallback callback, gpointer user_data)
{
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (GST_IS_ELEMENT (sibling));
gst_insert_bin_add (self, element, sibling, DIRECTION_BEFORE,
callback, user_data);
}
/**
* gst_insert_bin_insert_after:
* @element: the #GstElement to add
* @sibling: the #GstElement to add @element after
* @callback: (scope async): the callback to call when the element has been
* added or not, or %NULL
* @user_data: The data to pass to the callback
*
* This action signal adds the filter like element after the @sibling
* element in the bin.
*
* Same as the #GstInsertBin::insert-after signal.
*
* Since: 1.2
*/
void
gst_insert_bin_insert_after (GstInsertBin * self, GstElement * element,
GstElement * sibling, GstInsertBinCallback callback, gpointer user_data)
{
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (GST_IS_ELEMENT (sibling));
gst_insert_bin_add (self, element, sibling, DIRECTION_AFTER,
callback, user_data);
}
/**
* gst_insert_bin_remove:
* @element: the #GstElement to remove
* @callback: (scope async): the callback to call when the element has been
* removed or not, or %NULL
* @user_data: The data to pass to the callback
*
* This action signal removed the filter like element from the bin.
*
* Same as the #GstInsertBin::remove signal.
*
* Since: 1.2
*/
void
gst_insert_bin_remove (GstInsertBin * self, GstElement * element,
GstInsertBinCallback callback, gpointer user_data)
{
GstObject *parent;
g_return_if_fail (GST_IS_ELEMENT (element));
parent = gst_element_get_parent (element);
if (parent) {
gboolean is_parent;
is_parent = (parent == GST_OBJECT_CAST (self));
gst_object_unref (parent);
if (!is_parent) {
if (callback)
callback (self, element, FALSE, user_data);
return;
}
} else {
GList *item;
struct ChangeData *data = NULL;
GST_OBJECT_LOCK (self);
for (item = self->priv->change_queue.head; item; item = item->next) {
data = item->data;
if (data->element == element) {
if (data->action == GST_INSERT_BIN_ACTION_ADD)
g_queue_delete_link (&self->priv->change_queue, item);
break;
}
data = NULL;
}
GST_OBJECT_UNLOCK (self);
if (data) {
gst_object_ref (element);
gst_insert_bin_change_data_complete (self, data, TRUE);
if (callback)
callback (self, element, TRUE, user_data);
gst_object_unref (element);
} else {
if (callback)
callback (self, element, FALSE, user_data);
}
return;
}
gst_object_ref (element);
gst_insert_bin_add_operation (self, element, GST_INSERT_BIN_ACTION_REMOVE,
NULL, FALSE, callback, user_data);
}
/**
* gst_insert_bin_new:
* @name: (allow-none): The name of the new #GstInsertBin element (or %NULL)
*
* Creates a new #GstInsertBin
*
* Returns: The new #GstInsertBin
*
* Since: 1.2
*/
GstElement *
gst_insert_bin_new (const gchar * name)
{
if (name)
return g_object_new (GST_TYPE_INSERT_BIN, "name", name, NULL);
else
return g_object_new (GST_TYPE_INSERT_BIN, NULL);
}
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