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gstreamer/gst/schedulers/gstfastscheduler.c
Wim Taymans 02adc6b669 Better add the check instead of crashing 
Original commit message from CVS:
Better add the check instead of crashing
2002-06-16 19:48:38 +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>
#include "cothreads_compat.h"
typedef struct _GstSchedulerChain GstSchedulerChain;
#define GST_PAD_THREADSTATE(pad) (cothread*) (GST_PAD_CAST (pad)->sched_private)
#define GST_ELEMENT_THREADSTATE(elem) (cothread*) (GST_ELEMENT_CAST (elem)->sched_private)
#define GST_ELEMENT_COTHREAD_STOPPING GST_ELEMENT_SCHEDULER_PRIVATE1
#define GST_ELEMENT_IS_COTHREAD_STOPPING(element) GST_FLAG_IS_SET((element), GST_ELEMENT_COTHREAD_STOPPING)
#define GST_ELEMENT_INTERRUPTED GST_ELEMENT_SCHEDULER_PRIVATE2
#define GST_ELEMENT_IS_INTERRUPTED(element) GST_FLAG_IS_SET((element), GST_ELEMENT_INTERRUPTED)
typedef struct _GstFastScheduler GstFastScheduler;
typedef struct _GstFastSchedulerClass GstFastSchedulerClass;
struct _GstSchedulerChain {
GstFastScheduler *sched;
GList *disabled;
GList *elements;
gint num_elements;
GstElement *entry;
GList *cothreaded_elements;
gint num_cothreaded;
gboolean schedule;
};
#define GST_TYPE_FAST_SCHEDULER \
(gst_fast_scheduler_get_type())
#define GST_FAST_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FAST_SCHEDULER,GstFastScheduler))
#define GST_FAST_SCHEDULER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FAST_SCHEDULER,GstFastSchedulerClass))
#define GST_IS_FAST_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FAST_SCHEDULER))
#define GST_IS_FAST_SCHEDULER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FAST_SCHEDULER))
#define GST_FAST_SCHEDULER_CAST(sched) ((GstFastScheduler *)(sched))
typedef enum {
GST_FAST_SCHEDULER_STATE_NONE,
GST_FAST_SCHEDULER_STATE_STOPPED,
GST_FAST_SCHEDULER_STATE_ERROR,
GST_FAST_SCHEDULER_STATE_RUNNING,
} GstFastSchedulerState;
struct _GstFastScheduler {
GstScheduler parent;
GList *elements;
gint num_elements;
GList *chains;
gint num_chains;
GstFastSchedulerState state;
cothread_context *context;
};
struct _GstFastSchedulerClass {
GstSchedulerClass parent_class;
};
static GType _gst_fast_scheduler_type = 0;
static void gst_fast_scheduler_class_init (GstFastSchedulerClass * klass);
static void gst_fast_scheduler_init (GstFastScheduler * scheduler);
static void gst_fast_scheduler_dispose (GObject *object);
static void gst_fast_scheduler_setup (GstScheduler *sched);
static void gst_fast_scheduler_reset (GstScheduler *sched);
static void gst_fast_scheduler_add_element (GstScheduler *sched, GstElement *element);
static void gst_fast_scheduler_remove_element (GstScheduler *sched, GstElement *element);
static GstElementStateReturn
gst_fast_scheduler_state_transition (GstScheduler *sched, GstElement *element, gint transition);
static void gst_fast_scheduler_lock_element (GstScheduler *sched, GstElement *element);
static void gst_fast_scheduler_unlock_element (GstScheduler *sched, GstElement *element);
static void gst_fast_scheduler_yield (GstScheduler *sched, GstElement *element);
static gboolean gst_fast_scheduler_interrupt (GstScheduler *sched, GstElement *element);
static void gst_fast_scheduler_error (GstScheduler *sched, GstElement *element);
static void gst_fast_scheduler_pad_connect (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static void gst_fast_scheduler_pad_disconnect (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static GstPad* gst_fast_scheduler_pad_select (GstScheduler *sched, GList *padlist);
static GstSchedulerState
gst_fast_scheduler_iterate (GstScheduler *sched);
/* defined but not used
static void gst_fast_scheduler_show (GstScheduler *sched);
*/
static GstSchedulerClass *parent_class = NULL;
static GType
gst_fast_scheduler_get_type (void)
{
if (!_gst_fast_scheduler_type) {
static const GTypeInfo scheduler_info = {
sizeof (GstFastSchedulerClass),
NULL,
NULL,
(GClassInitFunc) gst_fast_scheduler_class_init,
NULL,
NULL,
sizeof (GstFastScheduler),
0,
(GInstanceInitFunc) gst_fast_scheduler_init,
NULL
};
_gst_fast_scheduler_type = g_type_register_static (GST_TYPE_SCHEDULER, "GstFast"COTHREADS_NAME_CAPITAL"Scheduler", &scheduler_info, 0);
}
return _gst_fast_scheduler_type;
}
static void
gst_fast_scheduler_class_init (GstFastSchedulerClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstSchedulerClass *gstscheduler_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstscheduler_class = (GstSchedulerClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_SCHEDULER);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_fast_scheduler_dispose);
gstscheduler_class->setup = GST_DEBUG_FUNCPTR (gst_fast_scheduler_setup);
gstscheduler_class->reset = GST_DEBUG_FUNCPTR (gst_fast_scheduler_reset);
gstscheduler_class->add_element = GST_DEBUG_FUNCPTR (gst_fast_scheduler_add_element);
gstscheduler_class->remove_element = GST_DEBUG_FUNCPTR (gst_fast_scheduler_remove_element);
gstscheduler_class->state_transition = GST_DEBUG_FUNCPTR (gst_fast_scheduler_state_transition);
gstscheduler_class->lock_element = GST_DEBUG_FUNCPTR (gst_fast_scheduler_lock_element);
gstscheduler_class->unlock_element = GST_DEBUG_FUNCPTR (gst_fast_scheduler_unlock_element);
gstscheduler_class->yield = GST_DEBUG_FUNCPTR (gst_fast_scheduler_yield);
gstscheduler_class->interrupt = GST_DEBUG_FUNCPTR (gst_fast_scheduler_interrupt);
gstscheduler_class->error = GST_DEBUG_FUNCPTR (gst_fast_scheduler_error);
gstscheduler_class->pad_connect = GST_DEBUG_FUNCPTR (gst_fast_scheduler_pad_connect);
gstscheduler_class->pad_disconnect = GST_DEBUG_FUNCPTR (gst_fast_scheduler_pad_disconnect);
gstscheduler_class->pad_select = GST_DEBUG_FUNCPTR (gst_fast_scheduler_pad_select);
gstscheduler_class->iterate = GST_DEBUG_FUNCPTR (gst_fast_scheduler_iterate);
do_cothreads_init(NULL);
}
static void
gst_fast_scheduler_init (GstFastScheduler *scheduler)
{
scheduler->elements = NULL;
scheduler->num_elements = 0;
scheduler->chains = NULL;
scheduler->num_chains = 0;
}
static void
gst_fast_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 fast scheduler");
factory = gst_scheduler_factory_new ("fast"COTHREADS_NAME,
"A fast scheduler, it uses "COTHREADS_NAME" cothreads",
gst_fast_scheduler_get_type());
if (factory != NULL) {
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
}
else {
g_warning ("could not register scheduler: fast");
}
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstfast"COTHREADS_NAME_CAPITAL"scheduler",
plugin_init
};
static int
gst_fast_scheduler_loopfunc_wrapper (int argc, char *argv[])
{
GstElement *element = GST_ELEMENT_CAST (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",
GST_DEBUG_FUNCPTR_NAME (element->loopfunc), name);
(element->loopfunc) (element);
GST_DEBUG (GST_CAT_DATAFLOW, "element %s ended loop function", 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 void
gst_fast_scheduler_chainfunc_proxy (GstPad *pad, GstBuffer *buffer)
{
GstElement *element = GST_PAD_PARENT (pad);
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
GST_RPAD_BUFPEN (pad) = buffer;
while (GST_RPAD_BUFPEN (pad) != NULL) {
if (GST_ELEMENT_THREADSTATE (element)) {
do_cothread_switch (GST_ELEMENT_THREADSTATE (element));
}
else {
g_assert_not_reached();
}
}
GST_DEBUG_LEAVE ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
}
static GstBuffer*
gst_fast_scheduler_getfunc_proxy (GstPad *pad)
{
GstElement *element = GST_PAD_PARENT (pad);
GstPad *peer = GST_PAD_CAST (GST_RPAD_PEER (pad));
GstBuffer *buf;
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
while (GST_RPAD_BUFPEN (peer) == NULL) {
if (GST_ELEMENT_THREADSTATE (element)) {
do_cothread_switch (GST_ELEMENT_THREADSTATE (element));
}
else {
g_assert_not_reached();
}
}
GST_DEBUG_LEAVE ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
buf = GST_RPAD_BUFPEN (peer);
GST_RPAD_BUFPEN (peer) = NULL;
return buf;
}
static gboolean
gst_fast_scheduler_cothreaded_element (GstBin * bin, GstElement *element)
{
cothread_func wrapper_function;
GList *pads;
GstFastScheduler *sched;
GST_DEBUG (GST_CAT_SCHEDULING, "element is using COTHREADS");
sched = (GstFastScheduler *) GST_ELEMENT_SCHED (bin);
g_assert (GST_IS_FAST_SCHEDULER (sched));
wrapper_function = GST_DEBUG_FUNCPTR (gst_fast_scheduler_loopfunc_wrapper);
if (GST_ELEMENT_THREADSTATE (element) == NULL) {
do_cothread_create (GST_ELEMENT_THREADSTATE (element), sched->context, wrapper_function, 0, (char **) element);
if (GST_ELEMENT_THREADSTATE (element) == NULL) {
gst_element_error (element, "could not create cothread for \"%s\"",
GST_ELEMENT_NAME (element), NULL);
return FALSE;
GST_DEBUG (GST_CAT_SCHEDULING, "created cothread %p for '%s' with wrapper function &%s",
GST_ELEMENT_THREADSTATE (element),
GST_ELEMENT_NAME (element), GST_DEBUG_FUNCPTR_NAME (wrapper_function));
}
} else {
do_cothread_setfunc (GST_ELEMENT_THREADSTATE (element), sched->context, wrapper_function, 0, (char **) element);
GST_DEBUG (GST_CAT_SCHEDULING, "set wrapper function for '%s' to &%s",
GST_ELEMENT_NAME (element), GST_DEBUG_FUNCPTR_NAME (wrapper_function));
}
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *pad = GST_PAD_CAST (pads->data);
pads = g_list_next (pads);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
GST_DEBUG (GST_CAT_SCHEDULING, "setting gethandler to getfunc_proxy for %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_RPAD_GETHANDLER (pad) = gst_fast_scheduler_getfunc_proxy;
}
else {
GST_DEBUG (GST_CAT_SCHEDULING, "setting chainhandler to chainfunc_proxy for %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_RPAD_CHAINHANDLER (pad) = gst_fast_scheduler_chainfunc_proxy;
}
}
return TRUE;
}
static void
gst_fast_scheduler_event_proxy (GstPad *pad, GstBuffer *buf)
{
if (GST_IS_EVENT (buf))
GST_RPAD_EVENTFUNC (pad) (pad, GST_EVENT (buf));
else
GST_RPAD_CHAINFUNC (pad) (pad, buf);
}
static gboolean
gst_fast_scheduler_chained_element (GstBin *bin, GstElement *element) {
GList *pads;
GstPad *pad;
GST_DEBUG (GST_CAT_SCHEDULING,"chain entered");
/* 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 chain handler for %s:%s",GST_DEBUG_PAD_NAME (pad));
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_EVENT_AWARE))
GST_RPAD_CHAINHANDLER (pad) = gst_fast_scheduler_event_proxy;
else
GST_RPAD_CHAINHANDLER (pad) = GST_RPAD_CHAINFUNC (pad);
} else {
GST_DEBUG (GST_CAT_SCHEDULING,"copying get function into get handler for %s:%s",GST_DEBUG_PAD_NAME (pad));
if (!GST_RPAD_GETFUNC (pad))
GST_RPAD_GETHANDLER (pad) = gst_fast_scheduler_getfunc_proxy;
else
GST_RPAD_GETHANDLER (pad) = GST_RPAD_GETFUNC (pad);
}
}
return TRUE;
}
static GstSchedulerChain *
gst_fast_scheduler_chain_new (GstFastScheduler * 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 = NULL;
chain->num_cothreaded = 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_fast_scheduler_chain_destroy (GstSchedulerChain * chain)
{
GstFastScheduler *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 gboolean
gst_fast_scheduler_chain_enable_element (GstSchedulerChain * chain, GstElement * element)
{
GST_INFO (GST_CAT_SCHEDULING, "enabling element \"%s\" in chain %p, %d cothreaded elements",
GST_ELEMENT_NAME (element), chain, chain->num_cothreaded);
/* 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 */
if (element->loopfunc) {
chain->cothreaded_elements = g_list_prepend (chain->cothreaded_elements, element);
chain->num_cothreaded++;
return gst_fast_scheduler_cothreaded_element (GST_BIN (GST_SCHEDULER (chain->sched)->parent), element);
}
else {
if (element->numsinkpads == 0 || GST_ELEMENT_IS_DECOUPLED (element)) {
chain->entry = element;
}
return gst_fast_scheduler_chained_element (GST_BIN (GST_SCHEDULER (chain->sched)->parent), element);
}
}
static void
gst_fast_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);
if (element->loopfunc) {
chain->cothreaded_elements = g_list_remove (chain->cothreaded_elements, element);
chain->num_cothreaded--;
}
else {
if (chain->entry == element)
chain->entry = NULL;
}
}
static void
gst_fast_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 = GST_SCHEDULER (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_fast_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_fast_scheduler_chain_disable_element (chain, element);
}
/* we have to check for a threadstate here because a queue doesn't have one */
if (GST_ELEMENT_THREADSTATE (element)) {
do_cothread_destroy (GST_ELEMENT_THREADSTATE (element));
GST_ELEMENT_THREADSTATE (element) = NULL;
}
/* 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_fast_scheduler_chain_destroy (chain);
}
static void
gst_fast_scheduler_chain_elements (GstFastScheduler * 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_fast_scheduler_chain_new (sched);
gst_fast_scheduler_chain_add_element (chain, element1);
gst_fast_scheduler_chain_add_element (chain, element2);
/* 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->cothreaded_elements = g_list_concat (chain1->cothreaded_elements, g_list_copy (chain2->cothreaded_elements)); */
chain1->num_elements += chain2->num_elements;
/* chain1->num_cothreaded += chain2->num_cothreaded; */
gst_fast_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_fast_scheduler_chain_add_element (chain, element);
}
}
/* find the chain within the scheduler that holds the element, if any */
static GstSchedulerChain *
gst_fast_scheduler_find_chain (GstFastScheduler * 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_fast_scheduler_chain_recursive_add (GstSchedulerChain * chain, GstElement * element)
{
GList *pads;
GstPad *pad;
GstElement *peerelement;
/* add the element to the chain */
gst_fast_scheduler_chain_add_element (chain, element);
GST_DEBUG (GST_CAT_SCHEDULING, "recursing on element \"%s\"", 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",
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", 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",
GST_ELEMENT_NAME (peerelement));
/* if it's not already in a chain, add it to this one */
if (gst_fast_scheduler_find_chain (chain->sched, peerelement) == NULL) {
gst_fast_scheduler_chain_recursive_add (chain, peerelement);
}
}
}
}
}
/*
* Entry points for this scheduler.
*/
static void
gst_fast_scheduler_setup (GstScheduler *sched)
{
GstFastScheduler *fast = GST_FAST_SCHEDULER_CAST (sched);
/* first create thread context */
if (fast->context == NULL) {
GST_DEBUG (GST_CAT_SCHEDULING, "initializing cothread context");
fast->context = do_cothread_context_init ();
}
}
static void
gst_fast_scheduler_reset (GstScheduler *sched)
{
GstFastScheduler *fast = GST_FAST_SCHEDULER_CAST (sched);
GList *elements = fast->elements;
while (elements) {
GST_ELEMENT_THREADSTATE (elements->data) = NULL;
elements = g_list_next (elements);
}
do_cothread_context_destroy (fast->context);
fast->context = NULL;
}
static void
gst_fast_scheduler_add_element (GstScheduler * sched, GstElement * element)
{
GList *pads;
GstPad *pad;
GstElement *peerelement;
GstSchedulerChain *chain;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
/* 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_fast_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 */
bsched->elements = g_list_prepend (bsched->elements, element);
bsched->num_elements++;
/* create a chain to hold it, and add */
chain = gst_fast_scheduler_chain_new (bsched);
gst_fast_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_scheduler (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_fast_scheduler_chain_elements (bsched, element, peerelement);
}
}
}
}
static void
gst_fast_scheduler_remove_element (GstScheduler * sched, GstElement * element)
{
GstSchedulerChain *chain;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
if (g_list_find (bsched->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_fast_scheduler_find_chain (bsched, element);
/* remove it from its chain */
gst_fast_scheduler_chain_remove_element (chain, element);
/* remove it from the list of elements */
bsched->elements = g_list_remove (bsched->elements, element);
bsched->num_elements--;
/* unset the scheduler pointer in the element */
GST_ELEMENT_SCHED (element) = NULL;
}
}
static GstElementStateReturn
gst_fast_scheduler_state_transition (GstScheduler *sched, GstElement *element, gint transition)
{
GstSchedulerChain *chain;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
/* check if our parent changed state */
if (GST_SCHEDULER_PARENT (sched) == element) {
GST_INFO (GST_CAT_SCHEDULING, "parent \"%s\" changed state", GST_ELEMENT_NAME (element));
if (transition == GST_STATE_PLAYING_TO_PAUSED) {
GST_INFO (GST_CAT_SCHEDULING, "setting scheduler state to stopped");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_STOPPED;
}
else if (transition == GST_STATE_PAUSED_TO_PLAYING) {
GST_INFO (GST_CAT_SCHEDULING, "setting scheduler state to running");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_RUNNING;
}
else {
GST_INFO (GST_CAT_SCHEDULING, "no interesting state change, doing nothing");
}
}
else if (transition == GST_STATE_PLAYING_TO_PAUSED ||
transition == GST_STATE_PAUSED_TO_PLAYING) {
/* find the chain the element is in */
chain = gst_fast_scheduler_find_chain (bsched, element);
/* remove it from the chain */
if (chain) {
if (transition == GST_STATE_PLAYING_TO_PAUSED) {
gst_fast_scheduler_chain_disable_element (chain, element);
}
else if (transition == GST_STATE_PAUSED_TO_PLAYING) {
if (!gst_fast_scheduler_chain_enable_element (chain, element)) {
GST_INFO (GST_CAT_SCHEDULING, "could not enable element \"%s\"", GST_ELEMENT_NAME (element));
return GST_STATE_FAILURE;
}
}
}
else {
GST_INFO (GST_CAT_SCHEDULING, "element \"%s\" not found in any chain, no state change", GST_ELEMENT_NAME (element));
}
}
return GST_STATE_SUCCESS;
}
static void
gst_fast_scheduler_lock_element (GstScheduler * sched, GstElement * element)
{
if (GST_ELEMENT_THREADSTATE (element))
do_cothread_lock (GST_ELEMENT_THREADSTATE (element));
}
static void
gst_fast_scheduler_unlock_element (GstScheduler * sched, GstElement * element)
{
if (GST_ELEMENT_THREADSTATE (element))
do_cothread_unlock (GST_ELEMENT_THREADSTATE (element));
}
static void
gst_fast_scheduler_yield (GstScheduler *sched, GstElement *element)
{
if (GST_ELEMENT_IS_COTHREAD_STOPPING (element)) {
do_cothread_switch (do_cothread_get_main (GST_FAST_SCHEDULER_CAST (sched)->context));
}
}
static gboolean
gst_fast_scheduler_interrupt (GstScheduler *sched, GstElement *element)
{
if (do_cothread_get_current () != do_cothread_get_main (GST_FAST_SCHEDULER_CAST (sched)->context)) {
do_cothread_switch (do_cothread_get_main (GST_FAST_SCHEDULER_CAST (sched)->context));
return FALSE;
}
GST_FLAG_SET (element, GST_ELEMENT_INTERRUPTED);
return TRUE;
}
static void
gst_fast_scheduler_error (GstScheduler *sched, GstElement *element)
{
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
GstSchedulerChain *chain;
chain = gst_fast_scheduler_find_chain (bsched, element);
if (chain)
gst_fast_scheduler_chain_disable_element (chain, element);
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_ERROR;
gst_fast_scheduler_interrupt (sched, element);
}
static void
gst_fast_scheduler_pad_connect (GstScheduler * sched, GstPad *srcpad, GstPad *sinkpad)
{
GstElement *srcelement, *sinkelement;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
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",
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_fast_scheduler_chain_elements (bsched, srcelement, sinkelement);
}
}
static void
gst_fast_scheduler_pad_disconnect (GstScheduler * sched, GstPad * srcpad, GstPad * sinkpad)
{
GstElement *element1, *element2;
GstSchedulerChain *chain1, *chain2;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
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_CAST (GST_PAD_PARENT (srcpad));
element2 = GST_ELEMENT_CAST (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??
*/
chain1 = gst_fast_scheduler_find_chain (bsched, element1);
chain2 = gst_fast_scheduler_find_chain (bsched, element2);
if (chain1 != chain2) {
/* elements not in the same chain don't need to be separated */
GST_INFO (GST_CAT_SCHEDULING, "elements not in the same chain");
return;
}
if (chain1) {
GST_INFO (GST_CAT_SCHEDULING, "destroying chain");
gst_fast_scheduler_chain_destroy (chain1);
/* now create a new chain to hold element1 and build it from scratch */
chain1 = gst_fast_scheduler_chain_new (bsched);
gst_fast_scheduler_chain_recursive_add (chain1, element1);
}
/* check the other element to see if it landed in the newly created chain */
if (gst_fast_scheduler_find_chain (bsched, element2) == NULL) {
/* if not in chain, create chain and build from scratch */
chain2 = gst_fast_scheduler_chain_new (bsched);
gst_fast_scheduler_chain_recursive_add (chain2, element2);
}
}
static GstPad *
gst_fast_scheduler_pad_select (GstScheduler * sched, GList * padlist)
{
GstPad *pad = NULL;
GST_INFO (GST_CAT_SCHEDULING, "imlement me!!");
return pad;
}
static GstSchedulerState
gst_fast_scheduler_iterate (GstScheduler * sched)
{
GstBin *bin = GST_BIN (sched->parent);
GList *chains;
GstSchedulerChain *chain;
gint scheduled = 0;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
GstSchedulerState state;
GST_DEBUG_ENTER ("(\"%s\")", GST_ELEMENT_NAME (bin));
/* step through all the chains */
chains = bsched->chains;
if (chains == NULL) {
GST_DEBUG (GST_CAT_DATAFLOW, "no chains!");
state = GST_SCHEDULER_STATE_STOPPED;
goto exit;
}
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
if (chain->elements == NULL) {
continue;
}
if (chain->num_cothreaded > 1) {
g_warning ("this scheduler can only deal with 1 cothreaded element in a chain");
state = GST_SCHEDULER_STATE_ERROR;
goto exit;
}
else if (chain->num_cothreaded != 0) {
/* we just pick the first cothreaded element */
GstElement *entry = GST_ELEMENT (chain->cothreaded_elements->data);
GST_DEBUG (GST_CAT_DATAFLOW, "starting iteration via cothreads");
GST_FLAG_SET (entry, GST_ELEMENT_COTHREAD_STOPPING);
GST_DEBUG (GST_CAT_DATAFLOW, "set COTHREAD_STOPPING flag on \"%s\"(@%p)",
GST_ELEMENT_NAME (entry), entry);
if (GST_ELEMENT_THREADSTATE (entry)) {
do_cothread_switch (GST_ELEMENT_THREADSTATE (entry));
}
else {
GST_DEBUG (GST_CAT_DATAFLOW, "cothread switch not possible, element has no threadstate");
GST_DEBUG (GST_CAT_DATAFLOW, "leaving (%s)", GST_ELEMENT_NAME (bin));
state = GST_SCHEDULER_STATE_ERROR;
goto exit;
}
GST_DEBUG (GST_CAT_SCHEDULING, "loopfunc of element %s ended", GST_ELEMENT_NAME (entry));
scheduled++;
}
else {
GstElement *entry = chain->entry;
if (entry) {
GList *pads = gst_element_get_pad_list (entry);
GST_DEBUG (GST_CAT_DATAFLOW, "starting chained iteration");
while (pads) {
GstPad *pad = GST_PAD_CAST (pads->data);
pads = g_list_next (pads);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC) {
GstBuffer *buf;
buf = GST_RPAD_GETFUNC (pad) (pad);
if (GST_ELEMENT_IS_INTERRUPTED (entry)) {
GST_FLAG_UNSET (entry, GST_ELEMENT_INTERRUPTED);
break;
}
gst_pad_push (pad, buf);
scheduled++;
}
}
}
else {
GST_INFO (GST_CAT_DATAFLOW, "no entry found!!");
state = GST_SCHEDULER_STATE_ERROR;
goto exit;
}
}
state = GST_SCHEDULER_STATE (sched);
if (state != GST_SCHEDULER_STATE_RUNNING) {
GST_INFO (GST_CAT_DATAFLOW, "scheduler is not running, in state %d", state);
goto exit;
}
}
GST_DEBUG (GST_CAT_DATAFLOW, "leaving (%s)", GST_ELEMENT_NAME (bin));
if (scheduled == 0) {
GST_INFO (GST_CAT_DATAFLOW, "nothing was scheduled, return STOPPED");
state = GST_SCHEDULER_STATE_STOPPED;
}
else {
GST_INFO (GST_CAT_DATAFLOW, "scheduler still running, return RUNNING");
state = GST_SCHEDULER_STATE_RUNNING;
}
exit:
GST_DEBUG (GST_CAT_DATAFLOW, "leaving (%s) %d", GST_ELEMENT_NAME (bin), state);
return state;
}
/* defined but not used
static void
gst_fast_scheduler_show (GstScheduler * sched)
{
GList *chains, *elements;
GstElement *element;
GstSchedulerChain *chain;
GstFastScheduler *bsched = GST_FAST_SCHEDULER (sched);
if (sched == NULL) {
g_print ("scheduler doesn't exist for this element");
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: ", bsched->num_elements);
elements = bsched->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", bsched->num_chains);
chains = bsched->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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