gstreamer/gst/autoplug/gststaticautoplugrender.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gststaticautoplug.c: A static Autoplugger of pipelines
*
* 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.
*/
#include "gststaticautoplugrender.h"
#include <gst/gst.h>
#define GST_AUTOPLUG_MAX_COST 999999
typedef guint (*GstAutoplugCostFunction) (gpointer src, gpointer dest, gpointer data);
typedef GList* (*GstAutoplugListFunction) (gpointer data);
static void gst_static_autoplug_render_class_init (GstStaticAutoplugRenderClass *klass);
static void gst_static_autoplug_render_init (GstStaticAutoplugRender *autoplug);
static GList* gst_autoplug_func (gpointer src, gpointer sink,
GstAutoplugListFunction list_function,
GstAutoplugCostFunction cost_function,
gpointer data);
static GstElement* gst_static_autoplug_to_render (GstAutoplug *autoplug,
GstCaps *srccaps, GstElement *target, va_list args);
static GstAutoplugClass *parent_class = NULL;
GType gst_static_autoplug_render_get_type(void)
{
static GType static_autoplug_type = 0;
if (!static_autoplug_type) {
static const GTypeInfo static_autoplug_info = {
sizeof(GstElementClass),
NULL,
NULL,
(GClassInitFunc)gst_static_autoplug_render_class_init,
NULL,
NULL,
sizeof(GstElement),
0,
(GInstanceInitFunc)gst_static_autoplug_render_init,
};
static_autoplug_type = g_type_register_static (GST_TYPE_AUTOPLUG, "GstStaticAutoplugRender", &static_autoplug_info, 0);
}
return static_autoplug_type;
}
static void
gst_static_autoplug_render_class_init(GstStaticAutoplugRenderClass *klass)
{
GstAutoplugClass *gstautoplug_class;
gstautoplug_class = (GstAutoplugClass*) klass;
parent_class = g_type_class_ref(GST_TYPE_AUTOPLUG);
gstautoplug_class->autoplug_to_renderers = gst_static_autoplug_to_render;
}
static void gst_static_autoplug_render_init(GstStaticAutoplugRender *autoplug) {
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstAutoplugFactory *factory;
gst_plugin_set_longname (plugin, "A static autoplugger");
factory = gst_autoplugfactory_new ("staticrender",
"A static autoplugger, it constructs the complete element before running it",
gst_static_autoplug_render_get_type ());
if (factory != NULL) {
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
}
- some fixes to int2float making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it bui... Original commit message from CVS: - added playondemand plugin by Leif Morgan Johnson <lmjohns3@eos.ncsu.edu> - some fixes to int2float - aplied a patch from wrobell <wrobell@ite.pl> that is a first attempt at making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it builds. - Made the schedulers plugable. The default scheduler now lives inside a plugin. - Added a new mpeg1/2 parser/demuxer. - Fixed some compiler warnings in the core libs. - substantial work to GstThread (hopefully less race conditions). simplified the code in GstThread a bit. A state change can now also happen in the thread context. - reworked the state semantics of a bin. it'll now automatically get the highest state of its children. - the autoplugger now nests the threads so that a state change failure of one thread doesn't make its upstream thread lock. - GstQueue refuses to go to PLAYING if the sinkpad is not connected. This way the queue will not wedge in the _get lock. - GstQueue unlocks its mutexes when going to PAUSED. - make sure that when all elements in a bin/thread go to PAUSED, the bin is set to PAUSED too. - make a parent bin wait for its children to PAUSE before ending the iteration with FALSE (EOS) - Some changes to GstPlay to deal with EOS. - aplied the latest patch from Zeenix to gstrtp. end result: GstPlay doesn't crash on EOS and the pipeline is now shut down properly.
2001-12-04 22:12:50 +00:00
else {
g_warning ("could not register autoplugger: staticrender");
}
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gststaticautoplugrender",
plugin_init
};
static GstPadTemplate*
gst_autoplug_match_caps (GstElementFactory *factory, GstPadDirection direction, GstCaps *caps)
{
GList *templates;
templates = factory->padtemplates;
while (templates) {
GstPadTemplate *template = (GstPadTemplate *)templates->data;
if (template->direction == direction && direction == GST_PAD_SRC) {
if (gst_caps_check_compatibility (GST_PADTEMPLATE_CAPS (template), caps))
return template;
}
else if (template->direction == direction && direction == GST_PAD_SINK) {
if (gst_caps_check_compatibility (caps, GST_PADTEMPLATE_CAPS (template)))
return template;
}
templates = g_list_next (templates);
}
return NULL;
}
static gboolean
gst_autoplug_can_match (GstElementFactory *src, GstElementFactory *dest)
{
GList *srctemps, *desttemps;
srctemps = src->padtemplates;
while (srctemps) {
GstPadTemplate *srctemp = (GstPadTemplate *)srctemps->data;
srctemps = g_list_next (srctemps);
if (srctemp->direction != GST_PAD_SRC)
continue;
desttemps = dest->padtemplates;
while (desttemps) {
GstPadTemplate *desttemp = (GstPadTemplate *)desttemps->data;
desttemps = g_list_next (desttemps);
if (desttemp->direction == GST_PAD_SINK && desttemp->presence != GST_PAD_REQUEST) {
if (gst_caps_check_compatibility (GST_PADTEMPLATE_CAPS (srctemp), GST_PADTEMPLATE_CAPS (desttemp))) {
GST_DEBUG (GST_CAT_AUTOPLUG_ATTEMPT,
"factory \"%s\" can connect with factory \"%s\"\n",
GST_OBJECT_NAME (src), GST_OBJECT_NAME (dest));
return TRUE;
}
}
}
}
GST_DEBUG (GST_CAT_AUTOPLUG_ATTEMPT,
"factory \"%s\" cannot connect with factory \"%s\"\n",
GST_OBJECT_NAME (src), GST_OBJECT_NAME (dest));
return FALSE;
}
static gboolean
gst_autoplug_pads_autoplug_func (GstElement *src, GstPad *pad, GstElement *sink)
{
GList *sinkpads;
gboolean connected = FALSE;
GstElementState state = GST_STATE (gst_element_get_parent (src));
GST_DEBUG (0,"gstpipeline: autoplug pad connect function for %s %s:%s to \"%s\"\n",
GST_ELEMENT_NAME (src), GST_DEBUG_PAD_NAME(pad), GST_ELEMENT_NAME(sink));
if (state == GST_STATE_PLAYING)
gst_element_set_state (GST_ELEMENT (gst_element_get_parent (src)), GST_STATE_PAUSED);
sinkpads = gst_element_get_pad_list(sink);
while (sinkpads) {
GstPad *sinkpad = (GstPad *)sinkpads->data;
/* if we have a match, connect the pads */
if (gst_pad_get_direction(sinkpad) == GST_PAD_SINK &&
!GST_PAD_IS_CONNECTED (pad) && !GST_PAD_IS_CONNECTED(sinkpad))
{
if ((connected = gst_pad_connect (pad, sinkpad))) {
break;
}
else {
GST_DEBUG (0,"pads incompatible %s, %s\n", GST_PAD_NAME (pad), GST_PAD_NAME (sinkpad));
}
}
sinkpads = g_list_next(sinkpads);
}
if (state == GST_STATE_PLAYING)
gst_element_set_state (GST_ELEMENT (gst_element_get_parent (src)), GST_STATE_PLAYING);
if (!connected) {
GST_DEBUG (0,"gstpipeline: no path to sinks for type\n");
}
return connected;
}
static void
gst_autoplug_pads_autoplug (GstElement *src, GstElement *sink)
{
GList *srcpads;
gboolean connected = FALSE;
srcpads = gst_element_get_pad_list(src);
while (srcpads && !connected) {
GstPad *srcpad = (GstPad *)srcpads->data;
if (gst_pad_get_direction(srcpad) == GST_PAD_SRC) {
connected = gst_autoplug_pads_autoplug_func (src, srcpad, sink);
if (connected)
break;
}
srcpads = g_list_next(srcpads);
}
if (!connected) {
GST_DEBUG (0,"gstpipeline: delaying pad connections for \"%s\" to \"%s\"\n",
GST_ELEMENT_NAME(src), GST_ELEMENT_NAME(sink));
g_signal_connect (G_OBJECT(src),"new_pad",
G_CALLBACK (gst_autoplug_pads_autoplug_func), sink);
}
}
static GList*
gst_autoplug_elementfactory_get_list (gpointer data)
{
return (GList *) gst_elementfactory_get_list ();
}
typedef struct {
GstCaps *src;
GstCaps *sink;
} caps_struct;
#define IS_CAPS(cap) (((cap) == caps->src) || (cap) == caps->sink)
static guint
gst_autoplug_caps_find_cost (gpointer src, gpointer dest, gpointer data)
{
caps_struct *caps = (caps_struct *)data;
gboolean res;
if (IS_CAPS (src) && IS_CAPS (dest)) {
res = gst_caps_check_compatibility ((GstCaps *)src, (GstCaps *)dest);
/*GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"caps %d to caps %d %d", ((GstCaps *)src)->id, ((GstCaps *)dest)->id, res); */
}
else if (IS_CAPS (src)) {
GstPadTemplate *templ;
templ = gst_autoplug_match_caps ((GstElementFactory *)dest, GST_PAD_SINK, (GstCaps *)src);
if (templ && templ->presence != GST_PAD_REQUEST)
res = TRUE;
else
res = FALSE;
/*GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"factory %s to src caps %d %d", ((GstElementFactory *)dest)->name, ((GstCaps *)src)->id, res);*/
}
else if (IS_CAPS (dest)) {
GstPadTemplate *templ;
templ = gst_autoplug_match_caps ((GstElementFactory *)src, GST_PAD_SRC, (GstCaps *)dest);
if (templ && templ->presence != GST_PAD_REQUEST)
res = TRUE;
else
res = FALSE;
/*GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"factory %s to sink caps %d %d", ((GstElementFactory *)src)->name, ((GstCaps *)dest)->id, res);*/
}
else {
res = gst_autoplug_can_match ((GstElementFactory *)src, (GstElementFactory *)dest);
GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"factory %s to factory %s %d",
GST_OBJECT_NAME (src), GST_OBJECT_NAME (dest), res);
}
if (res)
return 1;
else
return GST_AUTOPLUG_MAX_COST;
}
static GstElement*
gst_static_autoplug_to_render (GstAutoplug *autoplug, GstCaps *srccaps, GstElement *target, va_list args)
{
caps_struct caps;
GstElement *targetelement;
GstElement *result = NULL, *srcelement = NULL;
GList **factories;
GList *chains = NULL;
GList *endelements = NULL;
guint numsinks = 0, i;
gboolean have_common = FALSE;
targetelement = target;
/*
* We first create a list of elements that are needed
* to convert the srcpad caps to the different sinkpad caps.
* and add the list of elementfactories to a list (chains).
*/
caps.src = srccaps;
while (targetelement) {
GList *elements;
GstRealPad *pad;
GstPadTemplate *templ;
pad = GST_PAD_REALIZE (gst_element_get_pad_list (targetelement)->data);
templ = GST_PAD_PADTEMPLATE (pad);
if (templ)
caps.sink = GST_PADTEMPLATE_CAPS (templ);
else
goto next;
GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"autoplugging two caps structures");
elements = gst_autoplug_func (caps.src, caps.sink,
gst_autoplug_elementfactory_get_list,
gst_autoplug_caps_find_cost,
&caps);
if (elements) {
chains = g_list_append (chains, elements);
endelements = g_list_append (endelements, targetelement);
numsinks++;
}
else {
}
next:
targetelement = va_arg (args, GstElement *);
}
/*
* If no list could be found the pipeline cannot be autoplugged and
* we return a NULL element
*/
if (numsinks == 0)
return NULL;
/*
* We now have a list of lists. We will turn this into an array
* of lists, this will make it much more easy to manipulate it
* in the next steps.
*/
factories = g_new0 (GList *, numsinks);
for (i = 0; chains; i++) {
GList *elements = (GList *) chains->data;
factories[i] = elements;
chains = g_list_next (chains);
}
/*FIXME, free the list */
result = gst_bin_new ("autoplug_bin");
/*
* We now hav a list of lists that is probably like:
*
* !
* A -> B -> C
* !
* A -> D -> E
*
* we now try to find the common elements (A) and add them to
* the bin. We remove them from both lists too.
*/
while (factories[0]) {
GstElementFactory *factory;
GstElement *element;
/* fase 3: add common elements */
factory = (GstElementFactory *) (factories[0]->data);
/* check to other paths for matching elements (factories) */
for (i=1; i<numsinks; i++) {
if (factory != (GstElementFactory *) (factories[i]->data)) {
goto differ;
}
}
GST_DEBUG (0,"common factory \"%s\"\n", GST_OBJECT_NAME (factory));
- some fixes to int2float making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it bui... Original commit message from CVS: - added playondemand plugin by Leif Morgan Johnson <lmjohns3@eos.ncsu.edu> - some fixes to int2float - aplied a patch from wrobell <wrobell@ite.pl> that is a first attempt at making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it builds. - Made the schedulers plugable. The default scheduler now lives inside a plugin. - Added a new mpeg1/2 parser/demuxer. - Fixed some compiler warnings in the core libs. - substantial work to GstThread (hopefully less race conditions). simplified the code in GstThread a bit. A state change can now also happen in the thread context. - reworked the state semantics of a bin. it'll now automatically get the highest state of its children. - the autoplugger now nests the threads so that a state change failure of one thread doesn't make its upstream thread lock. - GstQueue refuses to go to PLAYING if the sinkpad is not connected. This way the queue will not wedge in the _get lock. - GstQueue unlocks its mutexes when going to PAUSED. - make sure that when all elements in a bin/thread go to PAUSED, the bin is set to PAUSED too. - make a parent bin wait for its children to PAUSE before ending the iteration with FALSE (EOS) - Some changes to GstPlay to deal with EOS. - aplied the latest patch from Zeenix to gstrtp. end result: GstPlay doesn't crash on EOS and the pipeline is now shut down properly.
2001-12-04 22:12:50 +00:00
element = gst_elementfactory_create (factory, g_strdup (GST_OBJECT_NAME (factory)));
gst_bin_add (GST_BIN(result), element);
if (srcelement != NULL) {
gst_autoplug_pads_autoplug (srcelement, element);
}
/* this is the first element, find a good ghostpad */
else {
GList *pads;
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *pad = GST_PAD (pads->data);
GstPadTemplate *templ = GST_PAD_PADTEMPLATE (pad);
if (gst_caps_check_compatibility (srccaps, GST_PADTEMPLATE_CAPS (templ))) {
gst_element_add_ghost_pad (result, pad, "sink");
break;
}
pads = g_list_next (pads);
}
}
gst_autoplug_signal_new_object (GST_AUTOPLUG (autoplug), GST_OBJECT (element));
srcelement = element;
/* advance the pointer in all lists */
for (i=0; i<numsinks; i++) {
factories[i] = g_list_next (factories[i]);
}
have_common = TRUE;
}
differ:
/* loop over all the sink elements */
for (i = 0; i < numsinks; i++) {
GstElement *thesrcelement = srcelement;
GstElement *thebin = GST_ELEMENT(result);
GstElement *sinkelement;
gboolean use_thread;
sinkelement = GST_ELEMENT (endelements->data);
endelements = g_list_next (endelements);
use_thread = have_common;
while (factories[i] || sinkelement) {
/* fase 4: add other elements... */
GstElementFactory *factory;
GstElement *element;
if (factories[i]) {
factory = (GstElementFactory *)(factories[i]->data);
GST_DEBUG (0,"factory \"%s\"\n", GST_OBJECT_NAME (factory));
- some fixes to int2float making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it bui... Original commit message from CVS: - added playondemand plugin by Leif Morgan Johnson <lmjohns3@eos.ncsu.edu> - some fixes to int2float - aplied a patch from wrobell <wrobell@ite.pl> that is a first attempt at making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it builds. - Made the schedulers plugable. The default scheduler now lives inside a plugin. - Added a new mpeg1/2 parser/demuxer. - Fixed some compiler warnings in the core libs. - substantial work to GstThread (hopefully less race conditions). simplified the code in GstThread a bit. A state change can now also happen in the thread context. - reworked the state semantics of a bin. it'll now automatically get the highest state of its children. - the autoplugger now nests the threads so that a state change failure of one thread doesn't make its upstream thread lock. - GstQueue refuses to go to PLAYING if the sinkpad is not connected. This way the queue will not wedge in the _get lock. - GstQueue unlocks its mutexes when going to PAUSED. - make sure that when all elements in a bin/thread go to PAUSED, the bin is set to PAUSED too. - make a parent bin wait for its children to PAUSE before ending the iteration with FALSE (EOS) - Some changes to GstPlay to deal with EOS. - aplied the latest patch from Zeenix to gstrtp. end result: GstPlay doesn't crash on EOS and the pipeline is now shut down properly.
2001-12-04 22:12:50 +00:00
element = gst_elementfactory_create(factory, g_strdup (GST_OBJECT_NAME (factory)));
}
else {
element = sinkelement;
sinkelement = NULL;
}
/* this element suggests the use of a thread, so we set one up... */
if (GST_ELEMENT_IS_THREAD_SUGGESTED(element) || use_thread) {
GstElement *queue;
GstPad *srcpad;
- some fixes to int2float making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it bui... Original commit message from CVS: - added playondemand plugin by Leif Morgan Johnson <lmjohns3@eos.ncsu.edu> - some fixes to int2float - aplied a patch from wrobell <wrobell@ite.pl> that is a first attempt at making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it builds. - Made the schedulers plugable. The default scheduler now lives inside a plugin. - Added a new mpeg1/2 parser/demuxer. - Fixed some compiler warnings in the core libs. - substantial work to GstThread (hopefully less race conditions). simplified the code in GstThread a bit. A state change can now also happen in the thread context. - reworked the state semantics of a bin. it'll now automatically get the highest state of its children. - the autoplugger now nests the threads so that a state change failure of one thread doesn't make its upstream thread lock. - GstQueue refuses to go to PLAYING if the sinkpad is not connected. This way the queue will not wedge in the _get lock. - GstQueue unlocks its mutexes when going to PAUSED. - make sure that when all elements in a bin/thread go to PAUSED, the bin is set to PAUSED too. - make a parent bin wait for its children to PAUSE before ending the iteration with FALSE (EOS) - Some changes to GstPlay to deal with EOS. - aplied the latest patch from Zeenix to gstrtp. end result: GstPlay doesn't crash on EOS and the pipeline is now shut down properly.
2001-12-04 22:12:50 +00:00
GstElement *current_bin = thebin;
use_thread = FALSE;
GST_DEBUG (0,"sugest new thread for \"%s\" %08x\n", GST_ELEMENT_NAME (element), GST_FLAGS(element));
/* create a new queue and add to the previous bin */
queue = gst_elementfactory_make("queue", g_strconcat("queue_", GST_ELEMENT_NAME(element), NULL));
GST_DEBUG (0,"adding element \"%s\"\n", GST_ELEMENT_NAME (element));
/* this will be the new bin for all following elements */
thebin = gst_elementfactory_make("thread", g_strconcat("thread_", GST_ELEMENT_NAME(element), NULL));
gst_bin_add(GST_BIN(thebin), queue);
gst_autoplug_signal_new_object (GST_AUTOPLUG (autoplug), GST_OBJECT (queue));
srcpad = gst_element_get_pad(queue, "src");
gst_autoplug_pads_autoplug(thesrcelement, queue);
GST_DEBUG (0,"adding element %s\n", GST_ELEMENT_NAME (element));
gst_bin_add(GST_BIN(thebin), element);
gst_autoplug_signal_new_object (GST_AUTOPLUG (autoplug), GST_OBJECT (element));
GST_DEBUG (0,"adding element %s\n", GST_ELEMENT_NAME (thebin));
- some fixes to int2float making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it bui... Original commit message from CVS: - added playondemand plugin by Leif Morgan Johnson <lmjohns3@eos.ncsu.edu> - some fixes to int2float - aplied a patch from wrobell <wrobell@ite.pl> that is a first attempt at making automake 1.5 happy (gst now requires automake1.5). It's still not perfect but it builds. - Made the schedulers plugable. The default scheduler now lives inside a plugin. - Added a new mpeg1/2 parser/demuxer. - Fixed some compiler warnings in the core libs. - substantial work to GstThread (hopefully less race conditions). simplified the code in GstThread a bit. A state change can now also happen in the thread context. - reworked the state semantics of a bin. it'll now automatically get the highest state of its children. - the autoplugger now nests the threads so that a state change failure of one thread doesn't make its upstream thread lock. - GstQueue refuses to go to PLAYING if the sinkpad is not connected. This way the queue will not wedge in the _get lock. - GstQueue unlocks its mutexes when going to PAUSED. - make sure that when all elements in a bin/thread go to PAUSED, the bin is set to PAUSED too. - make a parent bin wait for its children to PAUSE before ending the iteration with FALSE (EOS) - Some changes to GstPlay to deal with EOS. - aplied the latest patch from Zeenix to gstrtp. end result: GstPlay doesn't crash on EOS and the pipeline is now shut down properly.
2001-12-04 22:12:50 +00:00
gst_bin_add(GST_BIN(current_bin), thebin);
gst_autoplug_signal_new_object (GST_AUTOPLUG (autoplug), GST_OBJECT (thebin));
thesrcelement = queue;
}
/* no thread needed, easy case */
else {
GST_DEBUG (0,"adding element %s\n", GST_ELEMENT_NAME (element));
gst_bin_add(GST_BIN(thebin), element);
gst_autoplug_signal_new_object (GST_AUTOPLUG (autoplug), GST_OBJECT (element));
}
gst_autoplug_pads_autoplug(thesrcelement, element);
/* this element is now the new source element */
thesrcelement = element;
factories[i] = g_list_next(factories[i]);
}
}
return result;
}
/*
* shortest path algorithm
*
*/
struct _gst_autoplug_node
{
gpointer iNode;
gpointer iPrev;
gint iDist;
};
typedef struct _gst_autoplug_node gst_autoplug_node;
static gint
find_factory (gst_autoplug_node *rgnNodes, gpointer factory)
{
gint i=0;
while (rgnNodes[i].iNode) {
if (rgnNodes[i].iNode == factory) return i;
i++;
}
return 0;
}
static GList*
construct_path (gst_autoplug_node *rgnNodes, gpointer factory)
{
GstElementFactory *current;
GList *factories = NULL;
current = rgnNodes[find_factory(rgnNodes, factory)].iPrev;
GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"factories found in autoplugging (reversed order)");
while (current != NULL)
{
gpointer next = NULL;
next = rgnNodes[find_factory(rgnNodes, current)].iPrev;
if (next) {
factories = g_list_prepend (factories, current);
GST_INFO (GST_CAT_AUTOPLUG_ATTEMPT,"factory: \"%s\"", GST_OBJECT_NAME (current));
}
current = next;
}
return factories;
}
static GList*
gst_autoplug_enqueue (GList *queue, gpointer iNode, gint iDist, gpointer iPrev)
{
gst_autoplug_node *node = g_malloc (sizeof (gst_autoplug_node));
node->iNode = iNode;
node->iDist = iDist;
node->iPrev = iPrev;
queue = g_list_append (queue, node);
return queue;
}
static GList*
gst_autoplug_dequeue (GList *queue, gpointer *iNode, gint *iDist, gpointer *iPrev)
{
GList *head;
gst_autoplug_node *node;
head = g_list_first (queue);
if (head) {
node = (gst_autoplug_node *)head->data;
*iNode = node->iNode;
*iPrev = node->iPrev;
*iDist = node->iDist;
head = g_list_remove (queue, node);
}
return head;
}
static GList*
gst_autoplug_func (gpointer src, gpointer sink,
GstAutoplugListFunction list_function,
GstAutoplugCostFunction cost_function,
gpointer data)
{
gst_autoplug_node *rgnNodes;
GList *queue = NULL;
gpointer iNode, iPrev;
gint iDist, i, iCost;
GList *elements = g_list_copy (list_function(data));
GList *factories;
guint num_factories;
elements = g_list_append (elements, sink);
elements = g_list_append (elements, src);
factories = elements;
num_factories = g_list_length (factories);
rgnNodes = g_new0 (gst_autoplug_node, num_factories+1);
for (i=0; i< num_factories; i++) {
gpointer fact = factories->data;
rgnNodes[i].iNode = fact;
rgnNodes[i].iPrev = NULL;
if (fact == src) {
rgnNodes[i].iDist = 0;
}
else {
rgnNodes[i].iDist = GST_AUTOPLUG_MAX_COST;
}
factories = g_list_next (factories);
}
rgnNodes[num_factories].iNode = NULL;
queue = gst_autoplug_enqueue (queue, src, 0, NULL);
while (g_list_length (queue) > 0) {
GList *factories2 = elements;
queue = gst_autoplug_dequeue (queue, &iNode, &iDist, &iPrev);
for (i=0; i< num_factories; i++) {
gpointer current = factories2->data;
iCost = cost_function (iNode, current, data);
if (iCost != GST_AUTOPLUG_MAX_COST) {
if ((GST_AUTOPLUG_MAX_COST == rgnNodes[i].iDist) ||
(rgnNodes[i].iDist > (iCost + iDist))) {
rgnNodes[i].iDist = iDist + iCost;
rgnNodes[i].iPrev = iNode;
queue = gst_autoplug_enqueue (queue, current, iDist + iCost, iNode);
}
}
factories2 = g_list_next (factories2);
}
}
return construct_path (rgnNodes, sink);
}