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gstreamer/gst/gstbin.c
Erik Walthinsen 0c88b21a79 Some fixes to the non-chained case, it works in a very basic way. More use cases will hopefully provide some sanity. 
Original commit message from CVS:
Some fixes to the non-chained case, it works in a very basic way.  More use
cases will hopefully provide some sanity.
2000-12-21 07:10:28 +00:00

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
//#define GST_DEBUG_ENABLED
#include "gstbin.h"
#include "gstdebug.h"
#include "gstsrc.h"
#include "gstconnection.h"
GstElementDetails gst_bin_details = {
"Generic bin",
"Bin",
"Simple container object",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
static void gst_bin_real_destroy (GtkObject *object);
static GstElementStateReturn gst_bin_change_state (GstElement *element);
static GstElementStateReturn gst_bin_change_state_norecurse (GstBin *bin);
static gboolean gst_bin_change_state_type (GstBin *bin,
GstElementState state,
GtkType type);
static void gst_bin_create_plan_func (GstBin *bin);
static void gst_bin_iterate_func (GstBin *bin);
static xmlNodePtr gst_bin_save_thyself (GstElement *element, xmlNodePtr parent);
static void gst_bin_restore_thyself (GstElement *element, xmlNodePtr parent,
GHashTable *elements);
/* Bin signals and args */
enum {
OBJECT_ADDED,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_bin_class_init (GstBinClass *klass);
static void gst_bin_init (GstBin *bin);
static GstElementClass *parent_class = NULL;
static guint gst_bin_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_bin_get_type (void)
{
static GtkType bin_type = 0;
if (!bin_type) {
static const GtkTypeInfo bin_info = {
"GstBin",
sizeof(GstBin),
sizeof(GstBinClass),
(GtkClassInitFunc)gst_bin_class_init,
(GtkObjectInitFunc)gst_bin_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
bin_type = gtk_type_unique (GST_TYPE_ELEMENT, &bin_info);
}
return bin_type;
}
static void
gst_bin_class_init (GstBinClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class (GST_TYPE_ELEMENT);
gst_bin_signals[OBJECT_ADDED] =
gtk_signal_new ("object_added", GTK_RUN_FIRST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstBinClass, object_added),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_ELEMENT);
gtk_object_class_add_signals (gtkobject_class, gst_bin_signals, LAST_SIGNAL);
klass->change_state_type = gst_bin_change_state_type;
klass->create_plan = gst_bin_create_plan_func;
klass->iterate = gst_bin_iterate_func;
gstelement_class->change_state = gst_bin_change_state;
gstelement_class->save_thyself = gst_bin_save_thyself;
gstelement_class->restore_thyself = gst_bin_restore_thyself;
gtkobject_class->destroy = gst_bin_real_destroy;
}
static void
gst_bin_init (GstBin *bin)
{
// in general, we prefer to use cothreads for most things
GST_FLAG_SET (bin, GST_BIN_FLAG_PREFER_COTHREADS);
bin->numchildren = 0;
bin->children = NULL;
// FIXME temporary testing measure
// bin->use_cothreads = TRUE;
}
/**
* gst_bin_new:
* @name: name of new bin
*
* Create a new bin with given name.
*
* Returns: new bin
*/
GstElement*
gst_bin_new (gchar *name)
{
GstElement *bin = GST_ELEMENT (gtk_type_new (GST_TYPE_BIN));
gst_element_set_name (GST_ELEMENT (bin), name);
return bin;
}
/**
* gst_bin_add:
* @bin: #GstBin to add element to
* @element: #GstElement to add to bin
*
* Add the given element to the bin. Set the elements parent, and thus
* add a reference.
*/
void
gst_bin_add (GstBin *bin,
GstElement *element)
{
g_return_if_fail (bin != NULL);
g_return_if_fail (GST_IS_BIN (bin));
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
// must be NULL or PAUSED state in order to modify bin
g_return_if_fail ((GST_STATE (bin) == GST_STATE_NULL) ||
(GST_STATE (bin) == GST_STATE_PAUSED));
bin->children = g_list_append (bin->children, element);
bin->numchildren++;
gst_object_set_parent (GST_OBJECT (element), GST_OBJECT (bin));
/* we know we have at least one child, we just added one... */
// if (GST_STATE(element) < GST_STATE_READY)
// gst_bin_change_state_norecurse(bin,GST_STATE_READY);
gtk_signal_emit (GTK_OBJECT (bin), gst_bin_signals[OBJECT_ADDED], element);
}
/**
* gst_bin_remove:
* @bin: #GstBin to remove element from
* @element: #GstElement to remove
*
* Remove the element from its associated bin, unparenting as well.
*/
void
gst_bin_remove (GstBin *bin,
GstElement *element)
{
g_return_if_fail (bin != NULL);
g_return_if_fail (GST_IS_BIN (bin));
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (bin->children != NULL);
// must be NULL or PAUSED state in order to modify bin
g_return_if_fail ((GST_STATE (bin) == GST_STATE_NULL) ||
(GST_STATE (bin) == GST_STATE_PAUSED));
gst_object_unparent (GST_OBJECT (element));
bin->children = g_list_remove (bin->children, element);
bin->numchildren--;
/* if we're down to zero children, force state to NULL */
if (bin->numchildren == 0)
gst_element_set_state (GST_ELEMENT (bin), GST_STATE_NULL);
}
static GstElementStateReturn
gst_bin_change_state (GstElement *element)
{
GstBin *bin;
GList *children;
GstElement *child;
DEBUG_ENTER("(\"%s\")",gst_element_get_name (element));
g_return_val_if_fail (GST_IS_BIN (element), GST_STATE_FAILURE);
bin = GST_BIN (element);
DEBUG("currently %d(%s), %d(%s) pending\n", GST_STATE (element),
_gst_print_statename (GST_STATE (element)), GST_STATE_PENDING (element),
_gst_print_statename (GST_STATE_PENDING (element)));
// g_return_val_if_fail(bin->numchildren != 0, GST_STATE_FAILURE);
// g_print("-->\n");
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
DEBUG("setting state on '%s'\n",gst_element_get_name (child));
switch (gst_element_set_state (child, GST_STATE_PENDING (element))) {
case GST_STATE_FAILURE:
GST_STATE_PENDING (element) = GST_STATE_NONE_PENDING;
DEBUG("child '%s' failed to go to state %d(%s)\n", gst_element_get_name (child),
GST_STATE_PENDING (element), _gst_print_statename (GST_STATE_PENDING (element)));
return GST_STATE_FAILURE;
break;
case GST_STATE_ASYNC:
DEBUG("child '%s' is changing state asynchronously\n", gst_element_get_name (child));
break;
}
// g_print("\n");
children = g_list_next (children);
}
// g_print("<-- \"%s\"\n",gst_object_get_name(GST_OBJECT(bin)));
if (GST_STATE_PENDING (element) == GST_STATE_READY) {
GstObject *parent;
parent = gst_object_get_parent (GST_OBJECT (element));
if (!parent || !GST_IS_BIN (parent))
gst_bin_create_plan (bin);
}
return gst_bin_change_state_norecurse (bin);
}
static GstElementStateReturn
gst_bin_change_state_norecurse (GstBin *bin)
{
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT (bin));
else
return GST_STATE_FAILURE;
}
static gboolean
gst_bin_change_state_type(GstBin *bin,
GstElementState state,
GtkType type)
{
GList *children;
GstElement *child;
// g_print("gst_bin_change_state_type(\"%s\",%d,%d);\n",
// gst_object_get_name(GST_OBJECT(bin)),state,type);
g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
g_return_val_if_fail (bin->numchildren != 0, FALSE);
// g_print("-->\n");
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
if (GST_IS_BIN (child)) {
if (!gst_bin_set_state_type (GST_BIN (child), state,type))
return FALSE;
} else if (GTK_CHECK_TYPE (child,type)) {
if (!gst_element_set_state (child,state))
return FALSE;
}
// g_print("\n");
children = g_list_next (children);
}
if (type == GST_TYPE_BIN)
gst_element_set_state (GST_ELEMENT (bin),state);
return TRUE;
}
/**
* gst_bin_set_state_type:
* @bin: #GstBin to set the state
* @state: the new state to set the elements to
* @type: the type of elements to change
*
* Sets the state of only those objects of the given type.
*
* Returns: indication if the state change was successfull
*/
gboolean
gst_bin_set_state_type (GstBin *bin,
GstElementState state,
GtkType type)
{
GstBinClass *oclass;
DEBUG("gst_bin_set_state_type(\"%s\",%d,%d)\n",
gst_element_get_name (GST_ELEMENT (bin)), state,type);
g_return_val_if_fail (bin != NULL, FALSE);
g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
oclass = GST_BIN_CLASS (GTK_OBJECT (bin)->klass);
if (oclass->change_state_type)
(oclass->change_state_type) (bin,state,type);
return TRUE;
}
static void
gst_bin_real_destroy (GtkObject *object)
{
GstBin *bin = GST_BIN (object);
GList *children;
GstElement *child;
DEBUG("in gst_bin_real_destroy()\n");
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
gst_element_destroy (child);
children = g_list_next (children);
}
g_list_free (bin->children);
}
/**
* gst_bin_get_by_name:
* @bin: #Gstbin to search
* @name: the element name to search for
*
* get the element with the given name from this bin
*
* Returns: the element with the given name
*/
GstElement*
gst_bin_get_by_name (GstBin *bin,
gchar *name)
{
GList *children;
GstElement *child;
g_return_val_if_fail (bin != NULL, NULL);
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
g_return_val_if_fail (name != NULL, NULL);
g_print("gstbin: lookup element \"%s\" in \"%s\"\n", name,
gst_element_get_name (GST_ELEMENT (bin)));
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
if (!strcmp (child->name,name))
return child;
if (GST_IS_BIN (child)) {
GstElement *res = gst_bin_get_by_name (GST_BIN (child), name);
if (res)
return res;
}
children = g_list_next (children);
}
return NULL;
}
/**
* gst_bin_get_list:
* @bin: #Gstbin to get the list from
*
* get the list of elements in this bin
*
* Returns: a GList of elements
*/
GList*
gst_bin_get_list (GstBin *bin)
{
g_return_val_if_fail (bin != NULL, NULL);
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
return bin->children;
}
static xmlNodePtr
gst_bin_save_thyself (GstElement *element,
xmlNodePtr parent)
{
GstBin *bin = GST_BIN (element);
xmlNodePtr childlist;
GList *children;
GstElement *child;
if (GST_ELEMENT_CLASS (parent_class)->save_thyself)
GST_ELEMENT_CLASS (parent_class)->save_thyself (GST_ELEMENT (bin), parent);
childlist = xmlNewChild (parent,NULL,"children",NULL);
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
gst_element_save_thyself (child, childlist);
children = g_list_next (children);
}
return childlist;
}
static void
gst_bin_restore_thyself (GstElement *element,
xmlNodePtr parent,
GHashTable *elements)
{
GstBin *bin = GST_BIN (element);
xmlNodePtr field = parent->childs;
xmlNodePtr childlist;
g_print("gstbin: restore \"%s\"\n", gst_element_get_name (element));
while (field) {
if (!strcmp (field->name, "children")) {
childlist = field->childs;
while (childlist) {
if (!strcmp (childlist->name, "element")) {
GstElement *element = gst_element_load_thyself (childlist, elements);
gst_bin_add (bin, element);
}
childlist = childlist->next;
}
}
field = field->next;
}
}
void
gst_bin_use_cothreads (GstBin *bin,
gboolean enabled)
{
g_return_if_fail (GST_IS_BIN (bin));
bin->use_cothreads = enabled;
}
/**
* gst_bin_iterate:
* @bin: #Gstbin to iterate
*
* iterates over the elements in this bin
*/
void
gst_bin_iterate (GstBin *bin)
{
GstBinClass *oclass;
DEBUG_ENTER("(\"%s\")",gst_element_get_name(GST_ELEMENT(bin)));
oclass = GST_BIN_CLASS (GTK_OBJECT (bin)->klass);
if (oclass->iterate)
(oclass->iterate) (bin);
DEBUG_LEAVE("(\"%s\")",gst_element_get_name(GST_ELEMENT(bin)));
}
/**
* gst_bin_create_plan:
* @bin: #GstBin to create the plan for
*
* let the bin figure out how to handle the plugins in it.
*/
void
gst_bin_create_plan (GstBin *bin)
{
GstBinClass *oclass;
oclass = GST_BIN_CLASS (GTK_OBJECT (bin)->klass);
if (oclass->create_plan)
(oclass->create_plan) (bin);
}
typedef struct {
gulong offset;
gulong size;
} region_struct;
static int
gst_bin_loopfunc_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = gst_element_get_name (element);
DEBUG_ENTER("(%d,'%s')",argc,name);
do {
DEBUG("calling loopfunc %s for element %s\n",
GST_DEBUG_FUNCPTR_NAME (element->loopfunc),name);
(element->loopfunc) (element);
DEBUG("element %s ended loop function\n", name);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
DEBUG_LEAVE("(%d,'%s')",argc,name);
return 0;
}
static int
gst_bin_chain_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = gst_element_get_name (element);
GList *pads;
GstPad *pad;
GstBuffer *buf;
DEBUG_ENTER("(\"%s\")",name);
DEBUG("stepping through pads\n");
do {
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (pad->direction == GST_PAD_SINK) {
DEBUG("pulling a buffer from %s:%s\n", name, gst_pad_get_name (pad));
buf = gst_pad_pull (pad);
DEBUG("calling chain function of %s:%s\n", name, gst_pad_get_name (pad));
(pad->chainfunc) (pad,buf);
DEBUG("calling chain function of %s:%s done\n", name, gst_pad_get_name (pad));
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
DEBUG_LEAVE("(%d,'%s')",argc,name);
return 0;
}
static int
gst_bin_src_wrapper (int argc,char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
GList *pads;
GstPad *pad;
GstBuffer *buf;
G_GNUC_UNUSED const gchar *name = gst_element_get_name (element);
DEBUG_ENTER("(%d,\"%s\")",argc,name);
do {
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
if (pad->direction == GST_PAD_SRC) {
region_struct *region = cothread_get_data (element->threadstate, "region");
DEBUG("calling _getfunc for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
if (region) {
//gst_src_push_region (GST_SRC (element), region->offset, region->size);
if (pad->getregionfunc == NULL)
fprintf(stderr,"error, no getregionfunc in \"%s\"\n", name);
buf = (pad->getregionfunc)(pad, region->offset, region->size);
} else {
if (pad->getfunc == NULL)
fprintf(stderr,"error, no getfunc in \"%s\"\n", name);
buf = (pad->getfunc)(pad);
}
DEBUG("calling gst_pad_push on pad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
gst_pad_push (pad, buf);
}
pads = g_list_next(pads);
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
GST_FLAG_UNSET(element,GST_ELEMENT_COTHREAD_STOPPING);
DEBUG_LEAVE("");
return 0;
}
static void
gst_bin_pushfunc_proxy (GstPad *pad, GstBuffer *buf)
{
cothread_state *threadstate = GST_ELEMENT(pad->parent)->threadstate;
DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
DEBUG("putting buffer %p in peer's pen\n",buf);
pad->peer->bufpen = buf;
DEBUG("switching to %p (@%p)\n",threadstate,&(GST_ELEMENT(pad->parent)->threadstate));
cothread_switch (threadstate);
DEBUG("done switching\n");
}
static GstBuffer*
gst_bin_pullfunc_proxy (GstPad *pad)
{
GstBuffer *buf;
cothread_state *threadstate = GST_ELEMENT(pad->parent)->threadstate;
DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
if (pad->bufpen == NULL) {
DEBUG("switching to %p (@%p)\n",threadstate,&(GST_ELEMENT(pad->parent)->threadstate));
cothread_switch (threadstate);
}
DEBUG("done switching\n");
buf = pad->bufpen;
pad->bufpen = NULL;
return buf;
}
static GstBuffer *
gst_bin_chainfunc_proxy (GstPad *pad)
{
GstBuffer *buf;
}
// FIXME!!!
static void
gst_bin_pullregionfunc_proxy (GstPad *pad,
gulong offset,
gulong size)
{
region_struct region;
cothread_state *threadstate;
DEBUG_ENTER("%s:%s,%ld,%ld",GST_DEBUG_PAD_NAME(pad),offset,size);
region.offset = offset;
region.size = size;
threadstate = GST_ELEMENT(pad->parent)->threadstate;
cothread_set_data (threadstate, "region", &region);
cothread_switch (threadstate);
cothread_set_data (threadstate, "region", NULL);
}
static void
gst_bin_create_plan_func (GstBin *bin)
{
GstElement *manager;
GList *elements;
GstElement *element;
const gchar *elementname;
GSList *pending_bins = NULL;
GstBin *pending_bin;
GList *pads;
GstPad *pad;
GstElement *peer_manager;
cothread_func wrapper_function;
DEBUG_SET_STRING("(\"%s\")",gst_element_get_name (GST_ELEMENT (bin)));
DEBUG_ENTER_STRING;
// first figure out which element is the manager of this and all child elements
// if we're a managing bin ourselves, that'd be us
if (GST_FLAG_IS_SET (bin, GST_BIN_FLAG_MANAGER)) {
manager = GST_ELEMENT (bin);
DEBUG("setting manager to self\n");
// otherwise, it's what our parent says it is
} else {
manager = gst_element_get_manager (GST_ELEMENT (bin));
DEBUG("setting manager to \"%s\"\n", gst_element_get_name (manager));
}
// perform the first recursive pass of plan generation
// we set the manager of every element but those who manage themselves
// the need for cothreads is also determined recursively
DEBUG("performing first-phase recursion\n");
bin->need_cothreads = bin->use_cothreads;
if (bin->need_cothreads)
DEBUG("requiring cothreads because we're forced to\n");
elements = bin->children;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
#ifdef GST_DEBUG_ENABLED
elementname = gst_element_get_name (element);
#endif
DEBUG("have element \"%s\"\n",elementname);
// first set their manager
DEBUG("setting manager of \"%s\" to \"%s\"\n",elementname,gst_element_get_name(manager));
gst_element_set_manager (element, manager);
// we do recursion and such for Bins
if (GST_IS_BIN (element)) {
// recurse into the child Bin
DEBUG("recursing into child Bin \"%s\"\n",elementname);
gst_bin_create_plan (GST_BIN (element));
// check to see if it needs cothreads and isn't self-managing
if (((GST_BIN (element))->need_cothreads) && !GST_FLAG_IS_SET(element,GST_BIN_FLAG_MANAGER)) {
DEBUG("requiring cothreads because child bin \"%s\" does\n",elementname);
bin->need_cothreads = TRUE;
}
} else {
// then we need to determine whether they need cothreads
// if it's a loop-based element, use cothreads
if (element->loopfunc != NULL) {
DEBUG("requiring cothreads because \"%s\" is a loop-based element\n",elementname);
bin->need_cothreads = TRUE;
// if it's a 'complex' element, use cothreads
} else if (GST_FLAG_IS_SET (element, GST_ELEMENT_COMPLEX)) {
DEBUG("requiring cothreads because \"%s\" is complex\n",elementname);
bin->need_cothreads = TRUE;
// if the element has more than one sink pad, use cothreads
} else if (element->numsinkpads > 1) {
DEBUG("requiring cothreads because \"%s\" has more than one sink pad\n",elementname);
bin->need_cothreads = TRUE;
}
}
}
// if we're not a manager thread, we're done.
if (!GST_FLAG_IS_SET (bin, GST_BIN_FLAG_MANAGER)) {
DEBUG_LEAVE("(\"%s\")",gst_element_get_name(GST_ELEMENT(bin)));
return;
}
// clear previous plan state
g_list_free (bin->managed_elements);
bin->managed_elements = NULL;
bin->num_managed_elements = 0;
g_list_free (bin->entries);
bin->entries = NULL;
bin->num_entries = 0;
// find all the managed children
// here we pull off the trick of walking an entire arbitrary tree without recursion
DEBUG("attempting to find all the elements to manage\n");
pending_bins = g_slist_prepend (pending_bins, bin);
do {
// retrieve the top of the stack and pop it
pending_bin = GST_BIN (pending_bins->data);
pending_bins = g_slist_remove (pending_bins, pending_bin);
// walk the list of elements, find bins, and do stuff
DEBUG("checking Bin \"%s\" for managed elements\n",
gst_element_get_name (GST_ELEMENT (pending_bin)));
elements = pending_bin->children;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
#ifdef GST_DEBUG_ENABLED
elementname = gst_element_get_name (element);
#endif
// if it's ours, add it to the list
if (element->manager == GST_ELEMENT(bin)) {
// if it's a Bin, add it to the list of Bins to check
if (GST_IS_BIN (element)) {
DEBUG("flattened recurse into \"%s\"\n",elementname);
pending_bins = g_slist_prepend (pending_bins, element);
// otherwise add it to the list of elements
} else {
DEBUG("found element \"%s\" that I manage\n",elementname);
bin->managed_elements = g_list_prepend (bin->managed_elements, element);
bin->num_managed_elements++;
}
}
}
} while (pending_bins);
DEBUG("have %d elements to manage, implementing plan\n",bin->num_managed_elements);
// If cothreads are needed, we need to not only find elements but
// set up cothread states and various proxy functions.
if (bin->need_cothreads) {
DEBUG("bin is using cothreads\n");
// first create thread context
if (bin->threadcontext == NULL) {
DEBUG("initializing cothread context\n");
bin->threadcontext = cothread_init ();
}
// walk through all the children
elements = bin->managed_elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// start out with a NULL warpper function, we'll set it if we want a cothread
wrapper_function = NULL;
// have to decide if we need to or can use a cothreads, and if so which wrapper
// first of all, if there's a loopfunc, the decision's already made
if (element->loopfunc != NULL) {
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_loopfunc_wrapper);
DEBUG("element %s is a loopfunc, must use a cothread\n",gst_element_get_name(element));
} else {
// otherwise we need to decide if it needs a cothread
// if it's complex, or cothreads are preferred and it's *not* passive, cothread it
if (GST_FLAG_IS_SET (element,GST_ELEMENT_COMPLEX) ||
(GST_FLAG_IS_SET (bin,GST_BIN_FLAG_PREFER_COTHREADS) &&
!GST_FLAG_IS_SET (element,GST_ELEMENT_SCHEDULE_PASSIVELY))) {
// base it on whether we're going to loop through source or sink pads
if (element->numsinkpads == 0)
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_src_wrapper);
else
wrapper_function = GST_DEBUG_FUNCPTR(gst_bin_chain_wrapper);
}
}
// walk through the all the pads for this element, setting proxy functions
// the selection of proxy functions depends on whether we're in a cothread or not
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
// check to see if someone else gets to set up the element
peer_manager = GST_ELEMENT((pad)->peer->parent)->manager;
if (peer_manager != GST_ELEMENT(bin))
DEBUG("WARNING: pad %s:%s is connected outside of bin\n",GST_DEBUG_PAD_NAME(pad));
// if the wrapper_function is set, we need to use the proxy functions
if (wrapper_function != NULL) {
// set up proxy functions
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
DEBUG("setting push proxy for sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_proxy);
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
DEBUG("setting pull proxy for srcpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
}
} else {
// otherwise we need to set up for 'traditional' chaining
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
// we can just copy the chain function, since it shares the prototype
DEBUG("copying chain function into push proxy for %s:%s\n",
GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = pad->chainfunc;
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
// we can just copy the get function, since it shares the prototype
DEBUG("copying get function into pull proxy for %s:%s\n",
GST_DEBUG_PAD_NAME(pad));
pad->pullfunc = pad->getfunc;
}
}
}
// if a loopfunc has been specified, create and set up a cothread
if (wrapper_function != NULL) {
if (element->threadstate == NULL) {
element->threadstate = cothread_create (bin->threadcontext);
DEBUG("created cothread %p (@%p) for \"%s\"\n",element->threadstate,
&element->threadstate,gst_element_get_name(element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **)element);
DEBUG("set wrapper function for \"%s\" to &%s\n",gst_element_get_name(element),
GST_DEBUG_FUNCPTR_NAME(wrapper_function));
}
// // HACK: if the element isn't passive, it's an entry
// if (!GST_FLAG_IS_SET(element,GST_ELEMENT_SCHEDULE_PASSIVELY))
// bin->entries = g_list_append(bin->entries, element);
}
// otherwise, cothreads are not needed
} else {
DEBUG("bin is chained, no cothreads needed\n");
elements = bin->managed_elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
DEBUG("copying chain function into push proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = pad->chainfunc;
} else {
DEBUG("copying get function into pull proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->pullfunc = pad->getfunc;
}
}
}
}
DEBUG_LEAVE("(\"%s\")",gst_element_get_name(GST_ELEMENT(bin)));
}
void
gst_bin_iterate_func (GstBin *bin)
{
GList *entries;
GstElement *entry;
GList *pads;
GstPad *pad;
GstBuffer *buf;
DEBUG_SET_STRING("(\"%s\")", gst_element_get_name (GST_ELEMENT (bin)));
DEBUG_ENTER_STRING;
g_return_if_fail (bin != NULL);
g_return_if_fail (GST_IS_BIN (bin));
g_return_if_fail (GST_STATE (bin) == GST_STATE_PLAYING);
if (bin->need_cothreads) {
// all we really have to do is switch to the first child
// FIXME this should be lots more intelligent about where to start
DEBUG("starting iteration via cothreads\n");
entry = GST_ELEMENT (bin->managed_elements->data);
GST_FLAG_SET (entry, GST_ELEMENT_COTHREAD_STOPPING);
DEBUG("set COTHREAD_STOPPING flag on \"%s\"(@%p)\n",
gst_element_get_name(entry),entry);
cothread_switch (entry->threadstate);
} else {
DEBUG("starting iteration via chain-functions\n");
if (bin->num_entries <= 0) {
DEBUG("no entries in bin \"%s\", trying managed elements...\n",
gst_element_get_name(GST_ELEMENT(bin)));
// we will try loop over the elements then...
entries = bin->managed_elements;
}
else {
entries = bin->entries;
}
g_assert (entries != NULL);
while (entries) {
entry = GST_ELEMENT (entries->data);
entries = g_list_next (entries);
DEBUG("have entry \"%s\"\n",gst_element_get_name(entry));
if (GST_IS_SRC (entry) || GST_IS_CONNECTION (entry)) {
pads = entry->pads;
while (pads) {
pad = GST_PAD (pads->data);
if (pad->direction == GST_PAD_SRC) {
DEBUG("calling getfunc of %s:%s\n",GST_DEBUG_PAD_NAME(pad));
if (pad->getfunc == NULL)
fprintf(stderr, "error, no getfunc in \"%s\"\n", gst_element_get_name (entry));
else
buf = (pad->getfunc)(pad);
gst_pad_push(pad,buf);
}
pads = g_list_next (pads);
}
// } else if (GST_IS_CONNECTION (entry)) {
// gst_connection_push (GST_CONNECTION (entry));
} else if (GST_IS_BIN (entry))
gst_bin_iterate (GST_BIN (entry));
else {
fprintf(stderr, "gstbin: entry \"%s\" cannot be handled\n", gst_element_get_name (entry));
// g_assert_not_reached ();
}
}
}
DEBUG_LEAVE("(%s)", gst_element_get_name (GST_ELEMENT (bin)));
}
/*
// ***** check for possible connections outside
// get the pad's peer
peer = gst_pad_get_peer (pad);
// FIXME this should be an error condition, if not disabled
if (!peer) break;
// get the parent of the peer of the pad
outside = GST_ELEMENT (gst_pad_get_parent (peer));
// FIXME this should *really* be an error condition
if (!outside) break;
// if it's a source or connection and it's not ours...
if ((GST_IS_SRC (outside) || GST_IS_CONNECTION (outside)) &&
(gst_object_get_parent (GST_OBJECT (outside)) != GST_OBJECT (bin))) {
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
DEBUG("dealing with outside source element %s\n",gst_element_get_name(outside));
// DEBUG("PUNT: copying pullfunc ptr from %s:%s to %s:%s (@ %p)\n",
//GST_DEBUG_PAD_NAME(pad->peer),GST_DEBUG_PAD_NAME(pad),&pad->pullfunc);
// pad->pullfunc = pad->peer->pullfunc;
// DEBUG("PUNT: setting pushfunc proxy to fake proxy on %s:%s\n",GST_DEBUG_PAD_NAME(pad->peer));
// pad->peer->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_fake_proxy);
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
}
} else {
*/
/*
} else if (GST_IS_SRC (element)) {
DEBUG("adding '%s' as entry point, because it's a source\n",gst_element_get_name (element));
bin->entries = g_list_prepend (bin->entries,element);
bin->num_entries++;
cothread_setfunc(element->threadstate,gst_bin_src_wrapper,0,(char **)element);
}
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD(pads->data);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
DEBUG("setting push proxy for sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
// set the proxy functions
pad->pushfunc = GST_DEBUG_FUNCPTR(gst_bin_pushfunc_proxy);
DEBUG("pushfunc %p = gst_bin_pushfunc_proxy %p\n",&pad->pushfunc,gst_bin_pushfunc_proxy);
} else if (gst_pad_get_direction (pad) == GST_PAD_SRC) {
DEBUG("setting pull proxies for srcpad %s:%s\n",GST_DEBUG_PAD_NAME(pad));
// set the proxy functions
pad->pullfunc = GST_DEBUG_FUNCPTR(gst_bin_pullfunc_proxy);
DEBUG("pad->pullfunc(@%p) = gst_bin_pullfunc_proxy(@%p)\n",
&pad->pullfunc,gst_bin_pullfunc_proxy);
pad->pullregionfunc = GST_DEBUG_FUNCPTR(gst_bin_pullregionfunc_proxy);
}
pads = g_list_next (pads);
}
elements = g_list_next (elements);
// if there are no entries, we have to pick one at random
if (bin->num_entries == 0)
bin->entries = g_list_prepend (bin->entries, GST_ELEMENT(bin->children->data));
}
} else {
DEBUG("don't need cothreads, looking for entry points\n");
// we have to find which elements will drive an iteration
elements = bin->children;
while (elements) {
element = GST_ELEMENT (elements->data);
DEBUG("found element \"%s\"\n", gst_element_get_name (element));
if (GST_IS_BIN (element)) {
gst_bin_create_plan (GST_BIN (element));
}
if (GST_IS_SRC (element)) {
DEBUG("adding '%s' as entry point, because it's a source\n",gst_element_get_name (element));
bin->entries = g_list_prepend (bin->entries, element);
bin->num_entries++;
}
// go through all the pads, set pointers, and check for connections
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
DEBUG("found SINK pad %s:%s\n", GST_DEBUG_PAD_NAME(pad));
// copy the peer's chain function, easy enough
DEBUG("copying peer's chainfunc to %s:%s's pushfunc\n",GST_DEBUG_PAD_NAME(pad));
pad->pushfunc = GST_DEBUG_FUNCPTR(pad->peer->chainfunc);
// need to walk through and check for outside connections
//FIXME need to do this for all pads
// get the pad's peer
peer = gst_pad_get_peer (pad);
if (!peer) {
DEBUG("found SINK pad %s has no peer\n", gst_pad_get_name (pad));
break;
}
// get the parent of the peer of the pad
outside = GST_ELEMENT (gst_pad_get_parent (peer));
if (!outside) break;
// if it's a connection and it's not ours...
if (GST_IS_CONNECTION (outside) &&
(gst_object_get_parent (GST_OBJECT (outside)) != GST_OBJECT (bin))) {
gst_info("gstbin: element \"%s\" is the external source Connection "
"for internal element \"%s\"\n",
gst_element_get_name (GST_ELEMENT (outside)),
gst_element_get_name (GST_ELEMENT (element)));
bin->entries = g_list_prepend (bin->entries, outside);
bin->num_entries++;
}
}
else {
DEBUG("found pad %s\n", gst_pad_get_name (pad));
}
pads = g_list_next (pads);
}
elements = g_list_next (elements);
}
*/
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