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gstreamer/gst/schedulers/gstbasicscheduler.c
Wim Taymans 68d82dd00c Various cleanups and leak fixage. 
Original commit message from CVS:
Various cleanups and leak fixage.
2001-12-15 22:37:35 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstscheduler.c: Default scheduling code for most cases
*
* 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 <gst/gst.h>
typedef struct _GstSchedulerChain GstSchedulerChain;
struct _GstSchedulerChain {
GstScheduler *sched;
GList *disabled;
GList *elements;
gint num_elements;
GstElement *entry;
gint cothreaded_elements;
gboolean schedule;
};
static GType _gst_basic_scheduler_type = 0;
static void gst_basic_scheduler_class_init (GstSchedulerClass * klass);
static void gst_basic_scheduler_init (GstScheduler * scheduler);
static void gst_basic_scheduler_dispose (GObject *object);
static void gst_basic_scheduler_add_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_remove_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_enable_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_disable_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_lock_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_unlock_element (GstScheduler *sched, GstElement *element);
static void gst_basic_scheduler_pad_connect (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static void gst_basic_scheduler_pad_disconnect (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static GstPad* gst_basic_scheduler_pad_select (GstScheduler *sched, GList *padlist);
static gboolean gst_basic_scheduler_iterate (GstScheduler *sched);
static void gst_basic_scheduler_show (GstScheduler *sched);
static GstSchedulerClass *parent_class = NULL;
static GType
gst_basic_scheduler_get_type (void)
{
if (!_gst_basic_scheduler_type) {
static const GTypeInfo scheduler_info = {
sizeof (GstSchedulerClass),
NULL,
NULL,
(GClassInitFunc) gst_basic_scheduler_class_init,
NULL,
NULL,
sizeof (GstScheduler),
0,
(GInstanceInitFunc) gst_basic_scheduler_init,
NULL
};
_gst_basic_scheduler_type = g_type_register_static (GST_TYPE_SCHEDULER, "GstBasicScheduler", &scheduler_info, 0);
}
return _gst_basic_scheduler_type;
}
static void
gst_basic_scheduler_class_init (GstSchedulerClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_SCHEDULER);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_basic_scheduler_dispose);
klass->add_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_add_element);
klass->remove_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_remove_element);
klass->enable_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_enable_element);
klass->disable_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_disable_element);
klass->lock_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_lock_element);
klass->unlock_element = GST_DEBUG_FUNCPTR (gst_basic_scheduler_unlock_element);
klass->pad_connect = GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_connect);
klass->pad_disconnect = GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_disconnect);
klass->pad_select = GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_select);
klass->iterate = GST_DEBUG_FUNCPTR (gst_basic_scheduler_iterate);
}
static void
gst_basic_scheduler_init (GstScheduler *scheduler)
{
}
static void
gst_basic_scheduler_dispose (GObject *object)
{
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstSchedulerFactory *factory;
gst_plugin_set_longname (plugin, "A basic scheduler");
factory = gst_schedulerfactory_new ("basic",
"A basic scheduler, it uses cothreads",
gst_basic_scheduler_get_type());
if (factory != NULL) {
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
}
else {
g_warning ("could not register scheduler: basic");
}
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstbasicscheduler",
plugin_init
};
static int
gst_basic_scheduler_loopfunc_wrapper (int argc, char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG_ENTER ("(%d,'%s')", argc, name);
do {
GST_DEBUG (GST_CAT_DATAFLOW, "calling loopfunc %s for element %s\n",
GST_DEBUG_FUNCPTR_NAME (element->loopfunc), name);
(element->loopfunc) (element);
GST_DEBUG (GST_CAT_DATAFLOW, "element %s ended loop function\n", name);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE ("(%d,'%s')", argc, name);
return 0;
}
static int
gst_basic_scheduler_chain_wrapper (int argc, char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG_ENTER ("(\"%s\")", name);
GST_DEBUG (GST_CAT_DATAFLOW, "stepping through pads\n");
do {
GList *pads = element->pads;
while (pads) {
GstPad *pad = GST_PAD (pads->data);
GstRealPad *realpad;
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD (pad))
continue;
realpad = GST_REAL_PAD (pad);
if (GST_RPAD_DIRECTION (realpad) == GST_PAD_SINK) {
GstBuffer *buf;
GST_DEBUG (GST_CAT_DATAFLOW, "pulling data from %s:%s\n", name, GST_PAD_NAME (pad));
buf = gst_pad_pull (pad);
if (buf) {
if (GST_IS_EVENT (buf) && !GST_ELEMENT_IS_EVENT_AWARE (element)) {
//gst_pad_event_default (pad, GST_EVENT (buf));
gst_pad_send_event (pad, GST_EVENT (buf));
}
else {
GST_DEBUG (GST_CAT_DATAFLOW, "calling chain function of %s:%s\n", name,
GST_PAD_NAME (pad));
GST_RPAD_CHAINFUNC (realpad) (pad, buf);
}
}
GST_DEBUG (GST_CAT_DATAFLOW, "calling chain function of %s:%s done\n", name,
GST_PAD_NAME (pad));
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE ("(%d,'%s')", argc, name);
return 0;
}
static int
gst_basic_scheduler_src_wrapper (int argc, char *argv[])
{
GstElement *element = GST_ELEMENT (argv);
GList *pads;
GstRealPad *realpad;
GstBuffer *buf = NULL;
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG_ENTER ("(%d,\"%s\")", argc, name);
do {
pads = element->pads;
while (pads) {
if (!GST_IS_REAL_PAD (pads->data))
continue;
realpad = (GstRealPad *) (pads->data);
pads = g_list_next (pads);
if (GST_RPAD_DIRECTION (realpad) == GST_PAD_SRC) {
GST_DEBUG (GST_CAT_DATAFLOW, "calling _getfunc for %s:%s\n", GST_DEBUG_PAD_NAME (realpad));
if (realpad->regiontype != GST_REGION_VOID) {
g_return_val_if_fail (GST_RPAD_GETREGIONFUNC (realpad) != NULL, 0);
// if (GST_RPAD_GETREGIONFUNC(realpad) == NULL)
// fprintf(stderr,"error, no getregionfunc in \"%s\"\n", name);
// else
buf =
(GST_RPAD_GETREGIONFUNC (realpad)) ((GstPad *) realpad, realpad->regiontype,
realpad->offset, realpad->len);
realpad->regiontype = GST_REGION_VOID;
}
else {
g_return_val_if_fail (GST_RPAD_GETFUNC (realpad) != NULL, 0);
// if (GST_RPAD_GETFUNC(realpad) == NULL)
// fprintf(stderr,"error, no getfunc in \"%s\"\n", name);
// else
buf = GST_RPAD_GETFUNC (realpad) ((GstPad *) realpad);
}
GST_DEBUG (GST_CAT_DATAFLOW, "calling gst_pad_push on pad %s:%s\n",
GST_DEBUG_PAD_NAME (realpad));
gst_pad_push ((GstPad *) realpad, buf);
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG_LEAVE ("");
return 0;
}
static void
gst_basic_scheduler_chainhandler_proxy (GstPad * pad, GstBuffer * buf)
{
GstRealPad *peer = GST_RPAD_PEER (pad);
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
GST_DEBUG (GST_CAT_DATAFLOW, "putting buffer %p in peer \"%s:%s\"'s pen\n", buf,
GST_DEBUG_PAD_NAME (peer));
// FIXME this should be bounded
// loop until the bufferpen is empty so we can fill it up again
while (GST_RPAD_BUFPEN (pad) != NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p to empty bufpen\n",
GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
// we may no longer be the same pad, check.
if (GST_RPAD_PEER (peer) != (GstRealPad *) pad) {
GST_DEBUG (GST_CAT_DATAFLOW, "new pad in mid-switch!\n");
pad = (GstPad *) GST_RPAD_PEER (peer);
}
}
g_assert (GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) == NULL);
// now fill the bufferpen and switch so it can be consumed
GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) = buf;
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p\n",
GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
GST_DEBUG (GST_CAT_DATAFLOW, "done switching\n");
}
static void
gst_basic_scheduler_select_proxy (GstPad * pad, GstBuffer * buf)
{
g_print ("select proxy (%s:%s)\n", GST_DEBUG_PAD_NAME (pad));
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
GST_DEBUG (GST_CAT_DATAFLOW, "putting buffer %p in peer's pen\n", buf);
g_assert (GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) == NULL);
// now fill the bufferpen and switch so it can be consumed
GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) = buf;
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p\n",
GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
g_print ("%p %s\n", GST_ELEMENT (GST_PAD_PARENT (pad)),
gst_element_get_name (GST_ELEMENT (GST_PAD_PARENT (pad))));
GST_ELEMENT (GST_PAD_PARENT (pad))->select_pad = pad;
GST_FLAG_UNSET (GST_PAD_PARENT (pad), GST_ELEMENT_COTHREAD_STOPPING);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
g_print ("done switching\n");
GST_DEBUG (GST_CAT_DATAFLOW, "done switching\n");
}
static GstBuffer *
gst_basic_scheduler_gethandler_proxy (GstPad * pad)
{
GstBuffer *buf;
GstRealPad *peer = GST_RPAD_PEER (pad);
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
// FIXME this should be bounded
// we will loop switching to the peer until it's filled up the bufferpen
while (GST_RPAD_BUFPEN (pad) == NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to \"%s\": %p to fill bufpen\n",
GST_ELEMENT_NAME (GST_ELEMENT (GST_PAD_PARENT (pad))),
GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
// we may no longer be the same pad, check.
if (GST_RPAD_PEER (peer) != (GstRealPad *) pad) {
GST_DEBUG (GST_CAT_DATAFLOW, "new pad in mid-switch!\n");
pad = (GstPad *) GST_RPAD_PEER (peer);
}
}
GST_DEBUG (GST_CAT_DATAFLOW, "done switching\n");
// now grab the buffer from the pen, clear the pen, and return the buffer
buf = GST_RPAD_BUFPEN (pad);
GST_RPAD_BUFPEN (pad) = NULL;
return buf;
}
static GstBuffer *
gst_basic_scheduler_pullregionfunc_proxy (GstPad * pad, GstRegionType type, guint64 offset, guint64 len)
{
GstBuffer *buf;
GstRealPad *peer = GST_RPAD_PEER (pad);
GST_DEBUG_ENTER ("%s:%s,%d,%lld,%lld", GST_DEBUG_PAD_NAME (pad), type, offset, len);
// put the region info into the pad
GST_RPAD_REGIONTYPE (pad) = type;
GST_RPAD_OFFSET (pad) = offset;
GST_RPAD_LEN (pad) = len;
// FIXME this should be bounded
// we will loop switching to the peer until it's filled up the bufferpen
while (GST_RPAD_BUFPEN (pad) == NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "switching to %p to fill bufpen\n",
GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (pad))->threadstate);
// we may no longer be the same pad, check.
if (GST_RPAD_PEER (peer) != (GstRealPad *) pad) {
GST_DEBUG (GST_CAT_DATAFLOW, "new pad in mid-switch!\n");
pad = (GstPad *) GST_RPAD_PEER (peer);
}
}
GST_DEBUG (GST_CAT_DATAFLOW, "done switching\n");
// now grab the buffer from the pen, clear the pen, and return the buffer
buf = GST_RPAD_BUFPEN (pad);
GST_RPAD_BUFPEN (pad) = NULL;
return buf;
}
static void
gst_basic_scheduler_cothreaded_chain (GstBin * bin, GstSchedulerChain * chain)
{
GList *elements;
GstElement *element;
cothread_func wrapper_function;
GList *pads;
GstPad *pad;
GST_DEBUG (GST_CAT_SCHEDULING, "chain is using COTHREADS\n");
// first create thread context
if (bin->threadcontext == NULL) {
GST_DEBUG (GST_CAT_SCHEDULING, "initializing cothread context\n");
bin->threadcontext = cothread_init ();
}
// walk through all the chain's elements
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// start out without a wrapper function, we select it later
wrapper_function = NULL;
// if the element has a loopfunc...
if (element->loopfunc != NULL) {
wrapper_function = GST_DEBUG_FUNCPTR (gst_basic_scheduler_loopfunc_wrapper);
GST_DEBUG (GST_CAT_SCHEDULING, "element '%s' is a loop-based\n", GST_ELEMENT_NAME (element));
}
else {
// otherwise we need to decide what kind of cothread
// if it's not DECOUPLED, we decide based on whether it's a source or not
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
// if it doesn't have any sinks, it must be a source (duh)
if (element->numsinkpads == 0) {
wrapper_function = GST_DEBUG_FUNCPTR (gst_basic_scheduler_src_wrapper);
GST_DEBUG (GST_CAT_SCHEDULING, "element '%s' is a source, using _src_wrapper\n",
GST_ELEMENT_NAME (element));
}
else {
wrapper_function = GST_DEBUG_FUNCPTR (gst_basic_scheduler_chain_wrapper);
GST_DEBUG (GST_CAT_SCHEDULING, "element '%s' is a filter, using _chain_wrapper\n",
GST_ELEMENT_NAME (element));
}
}
}
// now we have to walk through the pads to set up their state
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD (pad))
continue;
// if the element is DECOUPLED or outside the manager, we have to chain
if ((wrapper_function == NULL) ||
(GST_RPAD_PEER (pad) &&
(GST_ELEMENT (GST_PAD_PARENT (GST_PAD (GST_RPAD_PEER (pad))))->sched != chain->sched))
) {
// set the chain proxies
if (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK) {
GST_DEBUG (GST_CAT_SCHEDULING, "copying chain function into push proxy for %s:%s\n",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_CHAINHANDLER (pad) = GST_RPAD_CHAINFUNC (pad);
}
else {
GST_DEBUG (GST_CAT_SCHEDULING, "copying get function into pull proxy for %s:%s\n",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_GETHANDLER (pad) = GST_RPAD_GETFUNC (pad);
GST_RPAD_PULLREGIONFUNC (pad) = GST_RPAD_GETREGIONFUNC (pad);
}
// otherwise we really are a cothread
}
else {
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
GST_DEBUG (GST_CAT_SCHEDULING, "setting cothreaded push proxy for sinkpad %s:%s\n",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_CHAINHANDLER (pad) = GST_DEBUG_FUNCPTR (gst_basic_scheduler_chainhandler_proxy);
}
else {
GST_DEBUG (GST_CAT_SCHEDULING, "setting cothreaded pull proxy for srcpad %s:%s\n",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_GETHANDLER (pad) = GST_DEBUG_FUNCPTR (gst_basic_scheduler_gethandler_proxy);
GST_RPAD_PULLREGIONFUNC (pad) = GST_DEBUG_FUNCPTR (gst_basic_scheduler_pullregionfunc_proxy);
}
}
}
// need to set up the cothread now
if (wrapper_function != NULL) {
if (element->threadstate == NULL) {
// FIXME handle cothread_create returning NULL
element->threadstate = cothread_create (bin->threadcontext);
GST_DEBUG (GST_CAT_SCHEDULING, "created cothread %p for '%s'\n", element->threadstate,
GST_ELEMENT_NAME (element));
}
cothread_setfunc (element->threadstate, wrapper_function, 0, (char **) element);
GST_DEBUG (GST_CAT_SCHEDULING, "set wrapper function for '%s' to &%s\n",
GST_ELEMENT_NAME (element), GST_DEBUG_FUNCPTR_NAME (wrapper_function));
}
}
}
/*
G_GNUC_UNUSED static void
gst_basic_scheduler_chained_chain (GstBin *bin, _GstBinChain *chain) {
GList *elements;
GstElement *element;
GList *pads;
GstPad *pad;
GST_DEBUG (GST_CAT_SCHEDULING,"chain entered\n");
// walk through all the elements
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
// walk through all the pads
pads = gst_element_get_pad_list (element);
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD(pad)) continue;
if (GST_RPAD_DIRECTION(pad) == GST_PAD_SINK) {
GST_DEBUG (GST_CAT_SCHEDULING,"copying chain function into push proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_CHAINHANDLER(pad) = GST_RPAD_CHAINFUNC(pad);
} else {
GST_DEBUG (GST_CAT_SCHEDULING,"copying get function into pull proxy for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
GST_RPAD_GETHANDLER(pad) = GST_RPAD_GETFUNC(pad);
GST_RPAD_PULLREGIONFUNC(pad) = GST_RPAD_GETREGIONFUNC(pad);
}
}
}
}
*/
static GstSchedulerChain *
gst_basic_scheduler_chain_new (GstScheduler * sched)
{
GstSchedulerChain *chain = g_new (GstSchedulerChain, 1);
// initialize the chain with sane values
chain->sched = sched;
chain->disabled = NULL;
chain->elements = NULL;
chain->num_elements = 0;
chain->entry = NULL;
chain->cothreaded_elements = 0;
chain->schedule = FALSE;
// add the chain to the schedulers' list of chains
sched->chains = g_list_prepend (sched->chains, chain);
sched->num_chains++;
GST_INFO (GST_CAT_SCHEDULING, "created new chain %p, now are %d chains in sched %p",
chain, sched->num_chains, sched);
return chain;
}
static void
gst_basic_scheduler_chain_destroy (GstSchedulerChain * chain)
{
GstScheduler *sched = chain->sched;
// remove the chain from the schedulers' list of chains
sched->chains = g_list_remove (sched->chains, chain);
sched->num_chains--;
// destroy the chain
g_list_free (chain->disabled); // should be empty...
g_list_free (chain->elements); // ditto
GST_INFO (GST_CAT_SCHEDULING, "destroyed chain %p, now are %d chains in sched %p", chain,
sched->num_chains, sched);
g_free (chain);
}
static void
gst_basic_scheduler_chain_add_element (GstSchedulerChain * chain, GstElement * element)
{
GST_INFO (GST_CAT_SCHEDULING, "adding element \"%s\" to chain %p", GST_ELEMENT_NAME (element),
chain);
// set the sched pointer for the element
element->sched = chain->sched;
// add the element to the list of 'disabled' elements
chain->disabled = g_list_prepend (chain->disabled, element);
chain->num_elements++;
}
static void
gst_basic_scheduler_chain_enable_element (GstSchedulerChain * chain, GstElement * element)
{
GST_INFO (GST_CAT_SCHEDULING, "enabling element \"%s\" in chain %p", GST_ELEMENT_NAME (element),
chain);
// remove from disabled list
chain->disabled = g_list_remove (chain->disabled, element);
// add to elements list
chain->elements = g_list_prepend (chain->elements, element);
// reschedule the chain
gst_basic_scheduler_cothreaded_chain (GST_BIN (chain->sched->parent), chain);
}
static void
gst_basic_scheduler_chain_disable_element (GstSchedulerChain * chain, GstElement * element)
{
GST_INFO (GST_CAT_SCHEDULING, "disabling element \"%s\" in chain %p", GST_ELEMENT_NAME (element),
chain);
// remove from elements list
chain->elements = g_list_remove (chain->elements, element);
// add to disabled list
chain->disabled = g_list_prepend (chain->disabled, element);
// reschedule the chain
// FIXME this should be done only if manager state != NULL
// gst_basic_scheduler_cothreaded_chain(GST_BIN(chain->sched->parent),chain);
}
static void
gst_basic_scheduler_chain_remove_element (GstSchedulerChain * chain, GstElement * element)
{
GST_INFO (GST_CAT_SCHEDULING, "removing element \"%s\" from chain %p", GST_ELEMENT_NAME (element),
chain);
// if it's active, deactivate it
if (g_list_find (chain->elements, element)) {
gst_basic_scheduler_chain_disable_element (chain, element);
}
// remove the element from the list of elements
chain->disabled = g_list_remove (chain->disabled, element);
chain->num_elements--;
// if there are no more elements in the chain, destroy the chain
if (chain->num_elements == 0)
gst_basic_scheduler_chain_destroy (chain);
// unset the sched pointer for the element
element->sched = NULL;
}
static void
gst_basic_scheduler_chain_elements (GstScheduler * sched, GstElement * element1, GstElement * element2)
{
GList *chains;
GstSchedulerChain *chain;
GstSchedulerChain *chain1 = NULL, *chain2 = NULL;
GstElement *element;
// first find the chains that hold the two
chains = sched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
if (g_list_find (chain->disabled, element1))
chain1 = chain;
else if (g_list_find (chain->elements, element1))
chain1 = chain;
if (g_list_find (chain->disabled, element2))
chain2 = chain;
else if (g_list_find (chain->elements, element2))
chain2 = chain;
}
// first check to see if they're in the same chain, we're done if that's the case
if ((chain1 != NULL) && (chain1 == chain2)) {
GST_INFO (GST_CAT_SCHEDULING, "elements are already in the same chain");
return;
}
// now, if neither element has a chain, create one
if ((chain1 == NULL) && (chain2 == NULL)) {
GST_INFO (GST_CAT_SCHEDULING, "creating new chain to hold two new elements");
chain = gst_basic_scheduler_chain_new (sched);
gst_basic_scheduler_chain_add_element (chain, element1);
gst_basic_scheduler_chain_add_element (chain, element2);
// FIXME chain changed here
// gst_basic_scheduler_cothreaded_chain(chain->sched->parent,chain);
// otherwise if both have chains already, join them
}
else if ((chain1 != NULL) && (chain2 != NULL)) {
GST_INFO (GST_CAT_SCHEDULING, "merging chain %p into chain %p", chain2, chain1);
// take the contents of chain2 and merge them into chain1
chain1->disabled = g_list_concat (chain1->disabled, g_list_copy (chain2->disabled));
chain1->elements = g_list_concat (chain1->elements, g_list_copy (chain2->elements));
chain1->num_elements += chain2->num_elements;
// FIXME chain changed here
// gst_basic_scheduler_cothreaded_chain(chain->sched->parent,chain);
gst_basic_scheduler_chain_destroy (chain2);
// otherwise one has a chain already, the other doesn't
}
else {
// pick out which one has the chain, and which doesn't
if (chain1 != NULL)
chain = chain1, element = element2;
else
chain = chain2, element = element1;
GST_INFO (GST_CAT_SCHEDULING, "adding element to existing chain");
gst_basic_scheduler_chain_add_element (chain, element);
// FIXME chain changed here
// gst_basic_scheduler_cothreaded_chain(chain->sched->parent,chain);
}
}
// find the chain within the scheduler that holds the element, if any
static GstSchedulerChain *
gst_basic_scheduler_find_chain (GstScheduler * sched, GstElement * element)
{
GList *chains;
GstSchedulerChain *chain;
GST_INFO (GST_CAT_SCHEDULING, "searching for element \"%s\" in chains",
GST_ELEMENT_NAME (element));
chains = sched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
if (g_list_find (chain->elements, element))
return chain;
if (g_list_find (chain->disabled, element))
return chain;
}
return NULL;
}
static void
gst_basic_scheduler_chain_recursive_add (GstSchedulerChain * chain, GstElement * element)
{
GList *pads;
GstPad *pad;
GstElement *peerelement;
// add the element to the chain
gst_basic_scheduler_chain_add_element (chain, element);
GST_DEBUG (GST_CAT_SCHEDULING, "recursing on element \"%s\"\n", GST_ELEMENT_NAME (element));
// now go through all the pads and see which peers can be added
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
GST_DEBUG (GST_CAT_SCHEDULING, "have pad %s:%s, checking for valid peer\n",
GST_DEBUG_PAD_NAME (pad));
// if the peer exists and could be in the same chain
if (GST_PAD_PEER (pad)) {
GST_DEBUG (GST_CAT_SCHEDULING, "has peer %s:%s\n", GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)));
peerelement = GST_PAD_PARENT (GST_PAD_PEER (pad));
if (GST_ELEMENT_SCHED (GST_PAD_PARENT (pad)) == GST_ELEMENT_SCHED (peerelement)) {
GST_DEBUG (GST_CAT_SCHEDULING, "peer \"%s\" is valid for same chain\n",
GST_ELEMENT_NAME (peerelement));
// if it's not already in a chain, add it to this one
if (gst_basic_scheduler_find_chain (chain->sched, peerelement) == NULL) {
gst_basic_scheduler_chain_recursive_add (chain, peerelement);
}
}
}
}
}
/*
* Entry points for this scheduler.
*/
static void
gst_basic_scheduler_add_element (GstScheduler * sched, GstElement * element)
{
GList *pads;
GstPad *pad;
GstElement *peerelement;
GstSchedulerChain *chain;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
// if it's already in this scheduler, don't bother doing anything
if (GST_ELEMENT_SCHED (element) == sched)
return;
GST_INFO (GST_CAT_SCHEDULING, "adding element \"%s\" to scheduler", GST_ELEMENT_NAME (element));
// if the element already has a different scheduler, remove the element from it
if (GST_ELEMENT_SCHED (element)) {
gst_basic_scheduler_remove_element (GST_ELEMENT_SCHED (element), element);
}
// set the sched pointer in the element itself
GST_ELEMENT_SCHED (element) = sched;
// only deal with elements after this point, not bins
// exception is made for Bin's that are schedulable, like the autoplugger
if (GST_IS_BIN (element) && !GST_FLAG_IS_SET (element, GST_BIN_SELF_SCHEDULABLE))
return;
// first add it to the list of elements that are to be scheduled
sched->elements = g_list_prepend (sched->elements, element);
sched->num_elements++;
// create a chain to hold it, and add
chain = gst_basic_scheduler_chain_new (sched);
gst_basic_scheduler_chain_add_element (chain, element);
// set the sched pointer in all the pads
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
// we only operate on real pads
if (!GST_IS_REAL_PAD (pad))
continue;
// set the pad's sched pointer
gst_pad_set_sched (pad, sched);
// if the peer element exists and is a candidate
if (GST_PAD_PEER (pad)) {
peerelement = GST_PAD_PARENT (GST_PAD_PEER (pad));
if (GST_ELEMENT_SCHED (element) == GST_ELEMENT_SCHED (peerelement)) {
GST_INFO (GST_CAT_SCHEDULING, "peer is in same scheduler, chaining together");
// make sure that the two elements are in the same chain
gst_basic_scheduler_chain_elements (sched, element, peerelement);
}
}
}
}
static void
gst_basic_scheduler_remove_element (GstScheduler * sched, GstElement * element)
{
GstSchedulerChain *chain;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
if (g_list_find (sched->elements, element)) {
GST_INFO (GST_CAT_SCHEDULING, "removing element \"%s\" from scheduler",
GST_ELEMENT_NAME (element));
// find what chain the element is in
chain = gst_basic_scheduler_find_chain (sched, element);
// remove it from its chain
gst_basic_scheduler_chain_remove_element (chain, element);
// remove it from the list of elements
sched->elements = g_list_remove (sched->elements, element);
sched->num_elements--;
// unset the scheduler pointer in the element
GST_ELEMENT_SCHED (element) = NULL;
}
}
static void
gst_basic_scheduler_enable_element (GstScheduler *sched, GstElement *element)
{
GstSchedulerChain *chain;
// find the chain the element's in
chain = gst_basic_scheduler_find_chain (sched, element);
if (chain) {
gst_basic_scheduler_chain_enable_element (chain, element);
}
else {
GST_INFO (GST_CAT_SCHEDULING, "element \"%s\" not found in any chain, not enabling", GST_ELEMENT_NAME (element));
}
}
static void
gst_basic_scheduler_disable_element (GstScheduler *sched, GstElement *element)
{
GstSchedulerChain *chain;
// find the chain the element is in
chain = gst_basic_scheduler_find_chain (sched, element);
// remove it from the chain
if (chain) {
gst_basic_scheduler_chain_disable_element (chain, element);
}
else {
GST_INFO (GST_CAT_SCHEDULING, "element \"%s\" not found in any chain, not disabling", GST_ELEMENT_NAME (element));
}
}
static void
gst_basic_scheduler_lock_element (GstScheduler * sched, GstElement * element)
{
if (element->threadstate)
cothread_lock (element->threadstate);
}
static void
gst_basic_scheduler_unlock_element (GstScheduler * sched, GstElement * element)
{
if (element->threadstate)
cothread_unlock (element->threadstate);
}
static void
gst_basic_scheduler_pad_connect (GstScheduler * sched, GstPad * srcpad, GstPad * sinkpad)
{
GstElement *srcelement, *sinkelement;
srcelement = GST_PAD_PARENT (srcpad);
g_return_if_fail (srcelement != NULL);
sinkelement = GST_PAD_PARENT (sinkpad);
g_return_if_fail (sinkelement != NULL);
GST_INFO (GST_CAT_SCHEDULING, "have pad connected callback on %s:%s to %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
GST_DEBUG (GST_CAT_SCHEDULING, "srcpad sched is %p, sinkpad sched is %p\n",
GST_ELEMENT_SCHED (srcelement), GST_ELEMENT_SCHED (sinkelement));
if (GST_ELEMENT_SCHED (srcelement) == GST_ELEMENT_SCHED (sinkelement)) {
GST_INFO (GST_CAT_SCHEDULING, "peer %s:%s is in same scheduler, chaining together",
GST_DEBUG_PAD_NAME (sinkpad));
gst_basic_scheduler_chain_elements (sched, srcelement, sinkelement);
}
}
static void
gst_basic_scheduler_pad_disconnect (GstScheduler * sched, GstPad * srcpad, GstPad * sinkpad)
{
GstSchedulerChain *chain;
GstElement *element1, *element2;
GstSchedulerChain *chain1, *chain2;
GST_INFO (GST_CAT_SCHEDULING, "disconnecting pads %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
// we need to have the parent elements of each pad
element1 = GST_ELEMENT (GST_PAD_PARENT (srcpad));
element2 = GST_ELEMENT (GST_PAD_PARENT (sinkpad));
// first task is to remove the old chain they belonged to.
// this can be accomplished by taking either of the elements,
// since they are guaranteed to be in the same chain
// FIXME is it potentially better to make an attempt at splitting cleaner??
chain = gst_basic_scheduler_find_chain (sched, element1);
if (chain) {
GST_INFO (GST_CAT_SCHEDULING, "destroying chain");
gst_basic_scheduler_chain_destroy (chain);
// now create a new chain to hold element1 and build it from scratch
chain1 = gst_basic_scheduler_chain_new (sched);
gst_basic_scheduler_chain_recursive_add (chain1, element1);
}
// check the other element to see if it landed in the newly created chain
if (gst_basic_scheduler_find_chain (sched, element2) == NULL) {
// if not in chain, create chain and build from scratch
chain2 = gst_basic_scheduler_chain_new (sched);
gst_basic_scheduler_chain_recursive_add (chain2, element2);
}
}
static GstPad *
gst_basic_scheduler_pad_select (GstScheduler * sched, GList * padlist)
{
GstPad *pad = NULL;
GList *padlist2 = padlist;
GST_INFO (GST_CAT_SCHEDULING, "performing select");
while (padlist2) {
pad = GST_PAD (padlist2->data);
if (gst_pad_peek (pad)) {
g_print ("found something in pad %s:%s\n", GST_DEBUG_PAD_NAME (pad));
return pad;
}
padlist2 = g_list_next (padlist2);
}
/* else there is nothing ready to consume, set up the select functions */
while (padlist) {
pad = GST_PAD (padlist->data);
GST_RPAD_CHAINHANDLER (pad) = GST_DEBUG_FUNCPTR (gst_basic_scheduler_select_proxy);
padlist = g_list_next (padlist);
}
if (pad != NULL) {
GstRealPad *peer = GST_RPAD_PEER (pad);
cothread_switch (GST_ELEMENT (GST_PAD_PARENT (peer))->threadstate);
g_print ("%p %s\n", GST_ELEMENT (GST_PAD_PARENT (pad)),
gst_element_get_name (GST_ELEMENT (GST_PAD_PARENT (pad))));
pad = GST_ELEMENT (GST_PAD_PARENT (pad))->select_pad;
g_assert (pad != NULL);
g_print ("back from select (%s:%s)\n", GST_DEBUG_PAD_NAME (pad));
}
return pad;
}
static gboolean
gst_basic_scheduler_iterate (GstScheduler * sched)
{
GstBin *bin = GST_BIN (sched->parent);
GList *chains;
GstSchedulerChain *chain;
GstElement *entry;
gboolean eos = FALSE;
GList *elements;
GST_DEBUG_ENTER ("(\"%s\")", GST_ELEMENT_NAME (bin));
g_return_val_if_fail (bin != NULL, TRUE);
g_return_val_if_fail (GST_IS_BIN (bin), TRUE);
// step through all the chains
chains = sched->chains;
g_return_val_if_fail (chains != NULL, FALSE);
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
// all we really have to do is switch to the first child
// FIXME this should be lots more intelligent about where to start
GST_DEBUG (GST_CAT_DATAFLOW, "starting iteration via cothreads\n");
if (chain->elements) {
entry = NULL; //MattH ADDED?
GST_DEBUG (GST_CAT_SCHEDULING, "there are %d elements in this chain\n", chain->num_elements);
elements = chain->elements;
while (elements) {
entry = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
if (GST_FLAG_IS_SET (entry, GST_ELEMENT_DECOUPLED)) {
GST_DEBUG (GST_CAT_SCHEDULING, "entry \"%s\" is DECOUPLED, skipping\n",
GST_ELEMENT_NAME (entry));
entry = NULL;
}
else if (GST_FLAG_IS_SET (entry, GST_ELEMENT_NO_ENTRY)) {
GST_DEBUG (GST_CAT_SCHEDULING, "entry \"%s\" is not valid, skipping\n",
GST_ELEMENT_NAME (entry));
entry = NULL;
}
else
break;
}
if (entry) {
GST_FLAG_SET (entry, GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG (GST_CAT_DATAFLOW, "set COTHREAD_STOPPING flag on \"%s\"(@%p)\n",
GST_ELEMENT_NAME (entry), entry);
cothread_switch (entry->threadstate);
// following is a check to see if the chain was interrupted due to a
// top-half state_change(). (i.e., if there's a pending state.)
//
// if it was, return to gstthread.c::gst_thread_main_loop() to
// execute the state change.
GST_DEBUG (GST_CAT_DATAFLOW, "cothread switch ended or interrupted\n");
if (GST_STATE_PENDING (GST_SCHEDULER (sched)->parent) != GST_STATE_VOID_PENDING) {
GST_DEBUG (GST_CAT_DATAFLOW, "handle pending state %d\n",
GST_STATE_PENDING (GST_SCHEDULER (sched)->parent));
return FALSE;
}
}
else {
GST_INFO (GST_CAT_DATAFLOW, "NO ENTRY INTO CHAIN!");
eos = TRUE;
}
}
else {
GST_INFO (GST_CAT_DATAFLOW, "NO ENABLED ELEMENTS IN CHAIN!!");
eos = TRUE;
}
}
GST_DEBUG (GST_CAT_DATAFLOW, "leaving (%s)\n", GST_ELEMENT_NAME (bin));
return !eos;
}
static void
gst_basic_scheduler_show (GstScheduler * sched)
{
GList *chains, *elements;
GstElement *element;
GstSchedulerChain *chain;
if (sched == NULL) {
g_print ("scheduler doesn't exist for this element\n");
return;
}
g_return_if_fail (GST_IS_SCHEDULER (sched));
g_print ("SCHEDULER DUMP FOR MANAGING BIN \"%s\"\n", GST_ELEMENT_NAME (sched->parent));
g_print ("scheduler has %d elements in it: ", sched->num_elements);
elements = sched->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("%s, ", GST_ELEMENT_NAME (element));
}
g_print ("\n");
g_print ("scheduler has %d chains in it\n", sched->num_chains);
chains = sched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
g_print ("%p: ", chain);
elements = chain->disabled;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("!%s, ", GST_ELEMENT_NAME (element));
}
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("%s, ", GST_ELEMENT_NAME (element));
}
g_print ("\n");
}
}
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