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gstreamer/gst/gstbin.c
Erik Walthinsen c287566d0c Massive scheduling changes (again). Not entirely complete, but getting closer. Need to think about various scheduli... 
Original commit message from CVS:
Massive scheduling changes (again).  Not entirely complete, but getting
closer.  Need to think about various scheduling plans that we might want
to produce, and figure out the rules for what is legal, and how to get
the results we need as far as the plan.
2000-12-20 09:39:43 +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 in peer's pen\n");
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) {
// 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_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) {
//printf("gstbin: no entries in bin \"%s\" trying children...\n", gst_element_get_name(GST_ELEMENT(bin)));
// we will try loop over the elements then...
entries = bin->children;
}
else {
entries = bin->entries;
}
g_assert (entries != NULL);
while (entries) {
entry = GST_ELEMENT (entries->data);
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 ();
}
entries = g_list_next (entries);
}
}
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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