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gstreamer/gst/schedulers/gstoptimalscheduler.c
Benjamin Otte 907e3e97d9 update plugin initialization restructuring (see email for details 
Original commit message from CVS:
update plugin initialization restructuring (see email for details
2003-10-31 19:32:47 +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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
GST_DEBUG_CATEGORY_STATIC(debug_scheduler);
#define GST_CAT_DEFAULT debug_scheduler
#ifdef USE_COTHREADS
# include "cothreads_compat.h"
#else
# define COTHREADS_NAME_CAPITAL ""
# define COTHREADS_NAME ""
#endif
#define GST_ELEMENT_SCHED_CONTEXT(elem) ((GstOptSchedulerCtx*) (GST_ELEMENT_CAST (elem)->sched_private))
#define GST_ELEMENT_SCHED_GROUP(elem) (GST_ELEMENT_SCHED_CONTEXT (elem)->group)
#define GST_PAD_BUFLIST(pad) ((GList*) (GST_REAL_PAD_CAST(pad)->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 _GstOptScheduler GstOptScheduler;
typedef struct _GstOptSchedulerClass GstOptSchedulerClass;
#define GST_TYPE_OPT_SCHEDULER \
(gst_opt_scheduler_get_type())
#define GST_OPT_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OPT_SCHEDULER,GstOptScheduler))
#define GST_OPT_SCHEDULER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OPT_SCHEDULER,GstOptSchedulerClass))
#define GST_IS_OPT_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OPT_SCHEDULER))
#define GST_IS_OPT_SCHEDULER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OPT_SCHEDULER))
#define GST_OPT_SCHEDULER_CAST(sched) ((GstOptScheduler *)(sched))
typedef enum {
GST_OPT_SCHEDULER_STATE_NONE,
GST_OPT_SCHEDULER_STATE_STOPPED,
GST_OPT_SCHEDULER_STATE_ERROR,
GST_OPT_SCHEDULER_STATE_RUNNING,
GST_OPT_SCHEDULER_STATE_INTERRUPTED
} GstOptSchedulerState;
struct _GstOptScheduler {
GstScheduler parent;
GstOptSchedulerState state;
#ifdef USE_COTHREADS
cothread_context *context;
#endif
gint iterations;
GSList *elements;
GSList *chains;
GList *runqueue;
gint recursion;
gint max_recursion;
};
struct _GstOptSchedulerClass {
GstSchedulerClass parent_class;
};
static GType _gst_opt_scheduler_type = 0;
typedef enum {
GST_OPT_SCHEDULER_CHAIN_DIRTY = (1 << 1),
GST_OPT_SCHEDULER_CHAIN_DISABLED = (1 << 2),
GST_OPT_SCHEDULER_CHAIN_RUNNING = (1 << 3),
} GstOptSchedulerChainFlags;
#define GST_OPT_SCHEDULER_CHAIN_DISABLE(chain) ((chain)->flags |= GST_OPT_SCHEDULER_CHAIN_DISABLED)
#define GST_OPT_SCHEDULER_CHAIN_ENABLE(chain) ((chain)->flags &= ~GST_OPT_SCHEDULER_CHAIN_DISABLED)
#define GST_OPT_SCHEDULER_CHAIN_IS_DISABLED(chain) ((chain)->flags & GST_OPT_SCHEDULER_CHAIN_DISABLED)
typedef struct _GstOptSchedulerChain GstOptSchedulerChain;
struct _GstOptSchedulerChain {
gint refcount;
GstOptScheduler *sched;
GstOptSchedulerChainFlags flags;
GSList *groups; /* the groups in this chain */
gint num_groups;
gint num_enabled;
};
/*
* elements that are scheduled in one cothread
*/
typedef enum {
GST_OPT_SCHEDULER_GROUP_DIRTY = (1 << 1), /* this group has been modified */
GST_OPT_SCHEDULER_GROUP_COTHREAD_STOPPING = (1 << 2), /* the group's cothread stops after one iteration */
GST_OPT_SCHEDULER_GROUP_DISABLED = (1 << 3), /* this group is disabled */
GST_OPT_SCHEDULER_GROUP_RUNNING = (1 << 4), /* this group is running */
GST_OPT_SCHEDULER_GROUP_SCHEDULABLE = (1 << 5), /* this group is schedulable */
GST_OPT_SCHEDULER_GROUP_VISITED = (1 << 6), /* this group is visited when finding links */
} GstOptSchedulerGroupFlags;
typedef enum {
GST_OPT_SCHEDULER_GROUP_GET = 1,
GST_OPT_SCHEDULER_GROUP_LOOP = 2,
} GstOptSchedulerGroupType;
#define GST_OPT_SCHEDULER_GROUP_SET_FLAG(group,flag) ((group)->flags |= (flag))
#define GST_OPT_SCHEDULER_GROUP_UNSET_FLAG(group,flag) ((group)->flags &= ~(flag))
#define GST_OPT_SCHEDULER_GROUP_IS_FLAG_SET(group,flag) ((group)->flags & (flag))
#define GST_OPT_SCHEDULER_GROUP_DISABLE(group) ((group)->flags |= GST_OPT_SCHEDULER_GROUP_DISABLED)
#define GST_OPT_SCHEDULER_GROUP_ENABLE(group) ((group)->flags &= ~GST_OPT_SCHEDULER_GROUP_DISABLED)
#define GST_OPT_SCHEDULER_GROUP_IS_ENABLED(group) (!((group)->flags & GST_OPT_SCHEDULER_GROUP_DISABLED))
#define GST_OPT_SCHEDULER_GROUP_IS_DISABLED(group) ((group)->flags & GST_OPT_SCHEDULER_GROUP_DISABLED)
typedef struct _GstOptSchedulerGroup GstOptSchedulerGroup;
typedef struct _GstOptSchedulerGroupLink GstOptSchedulerGroupLink;
/* used to keep track of links with other groups */
struct _GstOptSchedulerGroupLink {
GstOptSchedulerGroup *group1; /* the group we are linked with */
GstOptSchedulerGroup *group2; /* the group we are linked with */
gint count; /* the number of links with the group */
};
#define IS_GROUP_LINK(link, group1, group2) ((link->group1 == group1 && link->group2 == group2) || \
(link->group2 == group1 && link->group1 == group2))
#define OTHER_GROUP_LINK(link, group) (link->group1 == group ? link->group2 : link->group1)
typedef int (*GroupScheduleFunction) (int argc, char *argv[]);
struct _GstOptSchedulerGroup {
GstOptSchedulerChain *chain; /* the chain this group belongs to */
GstOptSchedulerGroupFlags flags; /* flags for this group */
GstOptSchedulerGroupType type; /* flags for this group */
gint refcount;
GSList *elements; /* elements of this group */
gint num_elements;
gint num_enabled;
GstElement *entry; /* the group's entry point */
GSList *group_links; /* other groups that are linked with this group */
#ifdef USE_COTHREADS
cothread *cothread; /* the cothread of this group */
#else
GroupScheduleFunction schedulefunc;
#endif
int argc;
char **argv;
};
/* some group operations */
static GstOptSchedulerGroup* ref_group (GstOptSchedulerGroup *group);
#ifndef USE_COTHREADS
/*
static GstOptSchedulerGroup* ref_group_by_count (GstOptSchedulerGroup *group, gint count);
*/
#endif
static GstOptSchedulerGroup* unref_group (GstOptSchedulerGroup *group);
static void destroy_group (GstOptSchedulerGroup *group);
static void group_element_set_enabled (GstOptSchedulerGroup *group,
GstElement *element, gboolean enabled);
static void chain_group_set_enabled (GstOptSchedulerChain *chain,
GstOptSchedulerGroup *group, gboolean enabled);
/*
* Scheduler private data for an element
*/
typedef struct _GstOptSchedulerCtx GstOptSchedulerCtx;
typedef enum {
GST_OPT_SCHEDULER_CTX_DISABLED = (1 << 1), /* the element is disabled */
} GstOptSchedulerCtxFlags;
struct _GstOptSchedulerCtx {
GstOptSchedulerGroup *group; /* the group this element belongs to */
GstOptSchedulerCtxFlags flags; /* flags for this element */
};
enum
{
ARG_0,
ARG_ITERATIONS,
ARG_MAX_RECURSION,
};
static void gst_opt_scheduler_class_init (GstOptSchedulerClass *klass);
static void gst_opt_scheduler_init (GstOptScheduler *scheduler);
static void gst_opt_scheduler_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_opt_scheduler_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static void gst_opt_scheduler_dispose (GObject *object);
static void gst_opt_scheduler_setup (GstScheduler *sched);
static void gst_opt_scheduler_reset (GstScheduler *sched);
static void gst_opt_scheduler_add_element (GstScheduler *sched, GstElement *element);
static void gst_opt_scheduler_remove_element (GstScheduler *sched, GstElement *element);
static GstElementStateReturn
gst_opt_scheduler_state_transition (GstScheduler *sched, GstElement *element, gint transition);
static void gst_opt_scheduler_scheduling_change (GstScheduler *sched, GstElement *element);
static void gst_opt_scheduler_lock_element (GstScheduler *sched, GstElement *element);
static void gst_opt_scheduler_unlock_element (GstScheduler *sched, GstElement *element);
static gboolean gst_opt_scheduler_yield (GstScheduler *sched, GstElement *element);
static gboolean gst_opt_scheduler_interrupt (GstScheduler *sched, GstElement *element);
static void gst_opt_scheduler_error (GstScheduler *sched, GstElement *element);
static void gst_opt_scheduler_pad_link (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static void gst_opt_scheduler_pad_unlink (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad);
static void gst_opt_scheduler_pad_select (GstScheduler *sched, GList *padlist);
static GstClockReturn gst_opt_scheduler_clock_wait (GstScheduler *sched, GstElement *element,
GstClockID id, GstClockTimeDiff *jitter);
static GstSchedulerState
gst_opt_scheduler_iterate (GstScheduler *sched);
static void gst_opt_scheduler_show (GstScheduler *sched);
static GstSchedulerClass *parent_class = NULL;
static GType
gst_opt_scheduler_get_type (void)
{
if (!_gst_opt_scheduler_type) {
static const GTypeInfo scheduler_info = {
sizeof (GstOptSchedulerClass),
NULL,
NULL,
(GClassInitFunc) gst_opt_scheduler_class_init,
NULL,
NULL,
sizeof (GstOptScheduler),
0,
(GInstanceInitFunc) gst_opt_scheduler_init,
NULL
};
_gst_opt_scheduler_type = g_type_register_static (GST_TYPE_SCHEDULER,
"GstOpt"COTHREADS_NAME_CAPITAL"Scheduler", &scheduler_info, 0);
}
return _gst_opt_scheduler_type;
}
static void
gst_opt_scheduler_class_init (GstOptSchedulerClass *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->set_property = GST_DEBUG_FUNCPTR (gst_opt_scheduler_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_opt_scheduler_get_property);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_opt_scheduler_dispose);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ITERATIONS,
g_param_spec_int ("iterations", "Iterations",
"Number of groups to schedule in one iteration (-1 == until EOS/error)",
-1, G_MAXINT, 1, G_PARAM_READWRITE));
#ifndef USE_COTHREADS
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_RECURSION,
g_param_spec_int ("max_recursion", "Max recursion",
"Maximum number of recursions",
1, G_MAXINT, 100, G_PARAM_READWRITE));
#endif
gstscheduler_class->setup = GST_DEBUG_FUNCPTR (gst_opt_scheduler_setup);
gstscheduler_class->reset = GST_DEBUG_FUNCPTR (gst_opt_scheduler_reset);
gstscheduler_class->add_element = GST_DEBUG_FUNCPTR (gst_opt_scheduler_add_element);
gstscheduler_class->remove_element = GST_DEBUG_FUNCPTR (gst_opt_scheduler_remove_element);
gstscheduler_class->state_transition = GST_DEBUG_FUNCPTR (gst_opt_scheduler_state_transition);
gstscheduler_class->scheduling_change = GST_DEBUG_FUNCPTR (gst_opt_scheduler_scheduling_change);
gstscheduler_class->lock_element = GST_DEBUG_FUNCPTR (gst_opt_scheduler_lock_element);
gstscheduler_class->unlock_element = GST_DEBUG_FUNCPTR (gst_opt_scheduler_unlock_element);
gstscheduler_class->yield = GST_DEBUG_FUNCPTR (gst_opt_scheduler_yield);
gstscheduler_class->interrupt = GST_DEBUG_FUNCPTR (gst_opt_scheduler_interrupt);
gstscheduler_class->error = GST_DEBUG_FUNCPTR (gst_opt_scheduler_error);
gstscheduler_class->pad_link = GST_DEBUG_FUNCPTR (gst_opt_scheduler_pad_link);
gstscheduler_class->pad_unlink = GST_DEBUG_FUNCPTR (gst_opt_scheduler_pad_unlink);
gstscheduler_class->pad_select = GST_DEBUG_FUNCPTR (gst_opt_scheduler_pad_select);
gstscheduler_class->clock_wait = GST_DEBUG_FUNCPTR (gst_opt_scheduler_clock_wait);
gstscheduler_class->iterate = GST_DEBUG_FUNCPTR (gst_opt_scheduler_iterate);
gstscheduler_class->show = GST_DEBUG_FUNCPTR (gst_opt_scheduler_show);
#ifdef USE_COTHREADS
do_cothreads_init(NULL);
#endif
}
static void
gst_opt_scheduler_init (GstOptScheduler *scheduler)
{
scheduler->elements = NULL;
scheduler->iterations = 1;
scheduler->max_recursion = 100;
}
static void
gst_opt_scheduler_dispose (GObject *object)
{
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean
plugin_init (GstPlugin *plugin)
{
GstSchedulerFactory *factory;
GST_DEBUG_CATEGORY_INIT (debug_scheduler, "scheduler", 0, "optimal scheduler");
#ifdef USE_COTHREADS
factory = gst_scheduler_factory_new ("opt"COTHREADS_NAME,
"An optimal scheduler using "COTHREADS_NAME" cothreads",
gst_opt_scheduler_get_type());
#else
factory = gst_scheduler_factory_new ("opt",
"An optimal scheduler using no cothreads",
gst_opt_scheduler_get_type());
#endif
if (factory != NULL) {
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
}
else {
g_warning ("could not register scheduler: optimal");
}
return TRUE;
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstopt"COTHREADS_NAME"scheduler",
"An optimal scheduler using "COTHREADS_NAME" cothreads",
plugin_init,
VERSION,
GST_LICENSE,
GST_VERSION,
GST_PACKAGE,
GST_ORIGIN
);
static void
destroy_chain (GstOptSchedulerChain *chain)
{
GstOptScheduler *osched;
GST_INFO ( "destroy chain %p", chain);
g_assert (chain->num_groups == 0);
g_assert (chain->groups == NULL);
osched = chain->sched;
osched->chains = g_slist_remove (osched->chains, chain);
gst_object_unref (GST_OBJECT (osched));
g_free (chain);
}
static GstOptSchedulerChain*
create_chain (GstOptScheduler *osched)
{
GstOptSchedulerChain *chain;
chain = g_new0 (GstOptSchedulerChain, 1);
chain->sched = osched;
chain->refcount = 1;
chain->flags = GST_OPT_SCHEDULER_CHAIN_DISABLED;
gst_object_ref (GST_OBJECT (osched));
osched->chains = g_slist_prepend (osched->chains, chain);
GST_INFO ( "new chain %p", chain);
return chain;
}
static GstOptSchedulerChain*
ref_chain (GstOptSchedulerChain *chain)
{
GST_LOG ("ref chain %p %d->%d", chain,
chain->refcount, chain->refcount+1);
chain->refcount++;
return chain;
}
static GstOptSchedulerChain*
unref_chain (GstOptSchedulerChain *chain)
{
GST_LOG ("unref chain %p %d->%d", chain,
chain->refcount, chain->refcount-1);
if (--chain->refcount == 0) {
destroy_chain (chain);
chain = NULL;
}
return chain;
}
static GstOptSchedulerChain*
add_to_chain (GstOptSchedulerChain *chain, GstOptSchedulerGroup *group)
{
GST_INFO ( "adding group %p to chain %p", group, chain);
g_assert (group->chain == NULL);
group = ref_group (group);
group->chain = ref_chain (chain);
chain->groups = g_slist_prepend (chain->groups, group);
chain->num_groups++;
if (GST_OPT_SCHEDULER_GROUP_IS_ENABLED (group)) {
chain_group_set_enabled (chain, group, TRUE);
}
return chain;
}
static GstOptSchedulerChain*
remove_from_chain (GstOptSchedulerChain *chain, GstOptSchedulerGroup *group)
{
GST_INFO ( "removing group %p from chain %p", group, chain);
if (!chain)
return NULL;
g_assert (group);
g_assert (group->chain == chain);
group->chain = NULL;
chain->groups = g_slist_remove (chain->groups, group);
chain->num_groups--;
unref_group (group);
if (chain->num_groups == 0)
chain = unref_chain (chain);
chain = unref_chain (chain);
return chain;
}
static GstOptSchedulerChain*
merge_chains (GstOptSchedulerChain *chain1, GstOptSchedulerChain *chain2)
{
GSList *walk;
g_assert (chain1 != NULL);
GST_INFO ( "merging chain %p and %p", chain1, chain2);
if (chain1 == chain2 || chain2 == NULL)
return chain1;
ref_chain (chain2);
walk = chain2->groups;
while (walk) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) walk->data;
walk = g_slist_next (walk);
GST_INFO ( "reparenting group %p from chain %p to %p",
group, chain2, chain1);
group->chain = NULL;
chain2->num_groups--;
chain2 = unref_chain (chain2);
group->chain = ref_chain (chain1);
chain1->groups = g_slist_prepend (chain1->groups, group);
chain1->num_groups++;
}
g_slist_free (chain2->groups);
chain2->groups = NULL;
unref_chain (chain2);
return chain1;
}
static void
chain_group_set_enabled (GstOptSchedulerChain *chain, GstOptSchedulerGroup *group, gboolean enabled)
{
g_assert (chain != NULL);
g_assert (group != NULL);
GST_INFO ( "request to %d group %p in chain %p, have %d groups enabled out of %d",
enabled, group, chain, chain->num_enabled, chain->num_groups);
if (enabled)
GST_OPT_SCHEDULER_GROUP_ENABLE (group);
else
GST_OPT_SCHEDULER_GROUP_DISABLE (group);
if (enabled) {
if (chain->num_enabled < chain->num_groups)
chain->num_enabled++;
GST_INFO ( "enable group %p in chain %p, now %d groups enabled out of %d", group, chain,
chain->num_enabled, chain->num_groups);
if (chain->num_enabled == chain->num_groups) {
GST_INFO ( "enable chain %p", chain);
GST_OPT_SCHEDULER_CHAIN_ENABLE (chain);
}
}
else {
if (chain->num_enabled > 0)
chain->num_enabled--;
GST_INFO ( "disable group %p in chain %p, now %d groups enabled out of %d", group, chain,
chain->num_enabled, chain->num_groups);
if (chain->num_enabled == 0) {
GST_INFO ( "disable chain %p", chain);
GST_OPT_SCHEDULER_CHAIN_DISABLE (chain);
}
}
}
/* recursively migrate the group and all connected groups into the new chain */
static void
chain_recursively_migrate_group (GstOptSchedulerChain *chain, GstOptSchedulerGroup *group)
{
GSList *links;
/* group already in chain */
if (group->chain == chain)
return;
/* first remove the group from its old chain */
remove_from_chain (group->chain, group);
/* add to new chain */
add_to_chain (chain, group);
/* then follow all links */
links = group->group_links;
while (links) {
GstOptSchedulerGroupLink *link = (GstOptSchedulerGroupLink *) links->data;
links = g_slist_next (links);
chain_recursively_migrate_group (chain, (link->group1 == group ? link->group2 : link->group1));
}
}
static GstOptSchedulerGroup*
ref_group (GstOptSchedulerGroup *group)
{
GST_LOG ("ref group %p %d->%d", group,
group->refcount, group->refcount+1);
group->refcount++;
return group;
}
#ifndef USE_COTHREADS
/* remove me
static GstOptSchedulerGroup*
ref_group_by_count (GstOptSchedulerGroup *group, gint count)
{
GST_LOG ("ref group %p %d->%d", group,
group->refcount, group->refcount+count);
group->refcount += count;
return group;
}
*/
#endif
static GstOptSchedulerGroup*
unref_group (GstOptSchedulerGroup *group)
{
GST_LOG ("unref group %p %d->%d", group,
group->refcount, group->refcount-1);
if (--group->refcount == 1) {
destroy_group (group);
group = NULL;
}
return group;
}
static GstOptSchedulerGroup*
add_to_group (GstOptSchedulerGroup *group, GstElement *element)
{
g_assert (group != NULL);
g_assert (element != NULL);
GST_INFO ( "adding element \"%s\" to group %p", GST_ELEMENT_NAME (element), group);
if (GST_ELEMENT_IS_DECOUPLED (element)) {
GST_INFO ( "element \"%s\" is decoupled, not adding to group %p",
GST_ELEMENT_NAME (element), group);
return group;
}
g_assert (GST_ELEMENT_SCHED_GROUP (element) == NULL);
GST_ELEMENT_SCHED_GROUP (element) = ref_group (group);
gst_object_ref (GST_OBJECT (element));
group->elements = g_slist_prepend (group->elements, element);
group->num_elements++;
if (gst_element_get_state (element) == GST_STATE_PLAYING) {
group_element_set_enabled (group, element, TRUE);
}
return group;
}
static GstOptSchedulerGroup*
create_group (GstOptSchedulerChain *chain, GstElement *element)
{
GstOptSchedulerGroup *group;
group = g_new0 (GstOptSchedulerGroup, 1);
GST_INFO ( "new group %p", group);
group->refcount = 1;
group->flags = GST_OPT_SCHEDULER_GROUP_DISABLED;
add_to_group (group, element);
add_to_chain (chain, group);
return group;
}
static void
destroy_group_scheduler (GstOptSchedulerGroup *group)
{
g_assert (group);
if (group->flags & GST_OPT_SCHEDULER_GROUP_RUNNING)
g_warning ("destroying running group scheduler");
#ifdef USE_COTHREADS
if (group->cothread) {
do_cothread_destroy (group->cothread);
group->cothread = NULL;
}
#else
group->schedulefunc = NULL;
group->argc = 0;
group->argv = NULL;
#endif
group->flags &= ~GST_OPT_SCHEDULER_GROUP_SCHEDULABLE;
}
static void
destroy_group (GstOptSchedulerGroup *group)
{
GST_INFO ( "destroy group %p", group);
g_assert (group != NULL);
g_assert (group->elements == NULL);
remove_from_chain (group->chain, group);
if (group->flags & GST_OPT_SCHEDULER_GROUP_SCHEDULABLE)
destroy_group_scheduler (group);
g_free (group);
}
static GstOptSchedulerGroup*
remove_from_group (GstOptSchedulerGroup *group, GstElement *element)
{
GST_INFO ( "removing element \"%s\" from group %p", GST_ELEMENT_NAME (element), group);
g_assert (group != NULL);
g_assert (element != NULL);
g_assert (GST_ELEMENT_SCHED_GROUP (element) == group);
group->elements = g_slist_remove (group->elements, element);
group->num_elements--;
/* if the element was an entry point in the group, clear the group's
* entry point */
if (group->entry == element) {
group->entry = NULL;
}
GST_ELEMENT_SCHED_GROUP (element) = NULL;
gst_object_unref (GST_OBJECT (element));
if (group->num_elements == 0) {
group = unref_group (group);
}
group = unref_group (group);
return group;
}
static GstOptSchedulerGroup*
merge_groups (GstOptSchedulerGroup *group1, GstOptSchedulerGroup *group2)
{
g_assert (group1 != NULL);
GST_INFO ( "merging groups %p and %p", group1, group2);
if (group1 == group2 || group2 == NULL)
return group1;
while (group2 && group2->elements) {
GstElement *element = (GstElement *)group2->elements->data;
group2 = remove_from_group (group2, element);
add_to_group (group1, element);
}
return group1;
}
static void
group_error_handler (GstOptSchedulerGroup *group)
{
GST_INFO ( "group %p has errored", group);
chain_group_set_enabled (group->chain, group, FALSE);
group->chain->sched->state = GST_OPT_SCHEDULER_STATE_ERROR;
}
/* this function enables/disables an element, it will set/clear a flag on the element
* and tells the chain that the group is enabled if all elements inside the group are
* enabled */
static void
group_element_set_enabled (GstOptSchedulerGroup *group, GstElement *element, gboolean enabled)
{
g_assert (group != NULL);
g_assert (element != NULL);
GST_INFO ( "request to %d element %s in group %p, have %d elements enabled out of %d",
enabled, GST_ELEMENT_NAME (element), group, group->num_enabled, group->num_elements);
if (enabled) {
if (group->num_enabled < group->num_elements)
group->num_enabled++;
GST_INFO ( "enable element %s in group %p, now %d elements enabled out of %d",
GST_ELEMENT_NAME (element), group, group->num_enabled, group->num_elements);
if (group->num_enabled == group->num_elements) {
GST_INFO ( "enable group %p", group);
chain_group_set_enabled (group->chain, group, TRUE);
}
}
else {
if (group->num_enabled > 0)
group->num_enabled--;
GST_INFO ( "disable element %s in group %p, now %d elements enabled out of %d",
GST_ELEMENT_NAME (element), group, group->num_enabled, group->num_elements);
if (group->num_enabled == 0) {
GST_INFO ( "disable group %p", group);
chain_group_set_enabled (group->chain, group, FALSE);
}
}
}
/* a group is scheduled by doing a cothread switch to it or
* by calling the schedule function. In the non-cothread case
* we cannot run already running groups so we return FALSE here
* to indicate this to the caller */
static gboolean
schedule_group (GstOptSchedulerGroup *group)
{
if (!group->entry) {
GST_INFO ( "not scheduling group %p without entry", group);
return FALSE;
}
#ifdef USE_COTHREADS
if (group->cothread)
do_cothread_switch (group->cothread);
else
g_warning ("(internal error): trying to schedule group without cothread");
return TRUE;
#else
/* cothreads automatically call the pre- and post-run functions for us;
* without cothreads we need to call them manually */
if (group->schedulefunc == NULL) {
GST_INFO ( "not scheduling group %p without schedulefunc",
group);
return FALSE;
} else {
GSList *l;
for (l=group->elements; l; l=l->next) {
GstElement *e = (GstElement*)l->data;
if (e->pre_run_func)
e->pre_run_func (e);
}
group->schedulefunc (group->argc, group->argv);
for (l=group->elements; l; l=l->next) {
GstElement *e = (GstElement*)l->data;
if (e->post_run_func)
e->post_run_func (e);
}
}
return TRUE;
#endif
}
#ifndef USE_COTHREADS
static void
gst_opt_scheduler_schedule_run_queue (GstOptScheduler *osched)
{
GST_LOG_OBJECT (osched, "entering scheduler run queue recursion %d %d",
osched->recursion, g_list_length (osched->runqueue));
/* make sure we don't exceed max_recursion */
if (osched->recursion > osched->max_recursion) {
osched->state = GST_OPT_SCHEDULER_STATE_ERROR;
return;
}
osched->recursion++;
while (osched->runqueue) {
GstOptSchedulerGroup *group;
gboolean res;
group = (GstOptSchedulerGroup *) osched->runqueue->data;
/* runqueue hols refcount to group */
osched->runqueue = g_list_remove (osched->runqueue, group);
GST_LOG_OBJECT (osched, "scheduling group %p", group);
res = schedule_group (group);
if (!res) {
g_warning ("error scheduling group %p", group);
group_error_handler (group);
}
else {
GST_LOG_OBJECT (osched, "done scheduling group %p", group);
}
unref_group (group);
}
GST_LOG_OBJECT (osched, "run queue length after scheduling %d", g_list_length (osched->runqueue));
osched->recursion--;
}
#endif
/* a chain is scheduled by picking the first active group and scheduling it */
static void
schedule_chain (GstOptSchedulerChain *chain)
{
GSList *groups;
GstOptScheduler *osched;
osched = chain->sched;
groups = chain->groups;
while (groups) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) groups->data;
if (!GST_OPT_SCHEDULER_GROUP_IS_DISABLED (group)) {
ref_group (group);
GST_LOG ("scheduling group %p in chain %p",
group, chain);
#ifdef USE_COTHREADS
schedule_group (group);
#else
osched->recursion = 0;
if (!g_list_find (osched->runqueue, group))
{
ref_group (group);
osched->runqueue = g_list_append (osched->runqueue, group);
}
gst_opt_scheduler_schedule_run_queue (osched);
#endif
GST_LOG ("done scheduling group %p in chain %p",
group, chain);
unref_group (group);
break;
}
groups = g_slist_next (groups);
}
}
/* a get-based group is scheduled by getting a buffer from the get based
* entry point and by pushing the buffer to the peer.
* We also set the running flag on this group for as long as this
* function is running. */
static int
get_group_schedule_function (int argc, char *argv[])
{
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) argv;
GstElement *entry = group->entry;
const GList *pads = gst_element_get_pad_list (entry);
GST_LOG ("get wrapper of group %p", group);
group->flags |= GST_OPT_SCHEDULER_GROUP_RUNNING;
while (pads) {
GstData *data;
GstPad *pad = GST_PAD_CAST (pads->data);
pads = g_list_next (pads);
/* skip sinks and ghostpads */
if (!GST_PAD_IS_SRC (pad) || !GST_IS_REAL_PAD (pad))
continue;
GST_LOG ("doing get and push on pad \"%s:%s\" in group %p",
GST_DEBUG_PAD_NAME (pad), group);
data = GST_RPAD_GETFUNC (pad) (pad);
if (data) {
if (GST_EVENT_IS_INTERRUPT (data)) {
gst_event_unref (GST_EVENT (data));
break;
}
gst_pad_push (pad, data);
}
}
group->flags &= ~GST_OPT_SCHEDULER_GROUP_RUNNING;
return 0;
}
/* a loop-based group is scheduled by calling the loop function
* on the entry point.
* We also set the running flag on this group for as long as this
* function is running. */
static int
loop_group_schedule_function (int argc, char *argv[])
{
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) argv;
GstElement *entry = group->entry;
GST_LOG ("loop wrapper of group %p", group);
group->flags |= GST_OPT_SCHEDULER_GROUP_RUNNING;
GST_LOG ("calling loopfunc of element %s in group %p",
GST_ELEMENT_NAME (entry), group);
entry->loopfunc (entry);
GST_LOG ("loopfunc ended of element %s in group %p",
GST_ELEMENT_NAME (entry), group);
group->flags &= ~GST_OPT_SCHEDULER_GROUP_RUNNING;
return 0;
}
/* the function to schedule an unknown group, which just gives an error */
static int
unknown_group_schedule_function (int argc, char *argv[])
{
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) argv;
g_warning ("(internal error) unknown group type %d, disabling\n", group->type);
group_error_handler (group);
return 0;
}
/* this function is called when the first element of a chain-loop or a loop-loop
* link performs a push to the loop element. We then schedule the
* group with the loop-based element until the bufpen is empty */
static void
gst_opt_scheduler_loop_wrapper (GstPad *sinkpad, GstData *data)
{
GstOptSchedulerGroup *group;
GstOptScheduler *osched;
GST_LOG ("loop wrapper, putting buffer in bufpen");
group = GST_ELEMENT_SCHED_GROUP (GST_PAD_PARENT (sinkpad));
osched = group->chain->sched;
#ifdef USE_COTHREADS
if (GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad))) {
g_warning ("deadlock detected, disabling group %p", group);
group_error_handler (group);
}
else {
GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad)) = g_list_append (GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad)), data);
schedule_group (group);
}
#else
GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad)) = g_list_append (GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad)), data);
if (!(group->flags & GST_OPT_SCHEDULER_GROUP_RUNNING)) {
GST_LOG ("adding %p to runqueue", group);
if (!g_list_find (osched->runqueue, group))
{
ref_group (group);
osched->runqueue = g_list_append (osched->runqueue, group);
}
}
#endif
GST_LOG ("after loop wrapper buflist %d",
g_list_length (GST_PAD_BUFLIST (GST_RPAD_PEER (sinkpad))));
}
/* this function is called by a loop based element that performs a
* pull on a sinkpad. We schedule the peer group until the bufpen
* is filled with the buffer so that this function can return */
static GstData*
gst_opt_scheduler_get_wrapper (GstPad *srcpad)
{
GstData *data;
GstOptSchedulerGroup *group;
GstOptScheduler *osched;
gboolean disabled;
GST_LOG ("get wrapper, removing buffer from bufpen");
/* first try to grab a queued buffer */
if (GST_PAD_BUFLIST (srcpad)) {
data = GST_PAD_BUFLIST (srcpad)->data;
GST_PAD_BUFLIST (srcpad) = g_list_remove (GST_PAD_BUFLIST (srcpad), data);
GST_LOG ("get wrapper, returning queued data %d",
g_list_length (GST_PAD_BUFLIST (srcpad)));
return data;
}
/* else we need to schedule the peer element */
group = GST_ELEMENT_SCHED_GROUP (GST_PAD_PARENT (srcpad));
osched = group->chain->sched;
data = NULL;
disabled = FALSE;
do {
#ifdef USE_COTHREADS
schedule_group (group);
#else
if (!(group->flags & GST_OPT_SCHEDULER_GROUP_RUNNING)) {
ref_group (group);
if (!g_list_find (osched->runqueue, group))
{
ref_group (group);
osched->runqueue = g_list_append (osched->runqueue, group);
}
GST_LOG_OBJECT (osched, "recursing into scheduler group %p", group);
gst_opt_scheduler_schedule_run_queue (osched);
GST_LOG_OBJECT (osched, "return from recurse group %p", group);
/* if the other group was disabled we might have to break out of the loop */
disabled = GST_OPT_SCHEDULER_GROUP_IS_DISABLED (group);
group = unref_group (group);
/* group is gone */
if (group == NULL) {
/* if the group was gone we also might have to break out of the loop */
disabled = TRUE;
}
}
else {
/* in this case, the group was running and we wanted to swtich to it,
* this is not allowed in the optimal scheduler (yet) */
g_warning ("deadlock detected, disabling group %p", group);
group_error_handler (group);
return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
#endif
/* if the scheduler interrupted, make sure we send an INTERRUPTED event to the
* loop based element */
if (osched->state == GST_OPT_SCHEDULER_STATE_INTERRUPTED) {
GST_INFO ( "scheduler interrupted, return interrupt event");
data = GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
else {
if (GST_PAD_BUFLIST (srcpad)) {
data = GST_PAD_BUFLIST (srcpad)->data;
GST_PAD_BUFLIST (srcpad) = g_list_remove (GST_PAD_BUFLIST (srcpad), data);
}
else if (disabled) {
/* no buffer in queue and peer group was disabled */
data = GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
}
}
while (data == NULL);
GST_LOG ("get wrapper, returning data %p, queue length %d",
data, g_list_length (GST_PAD_BUFLIST (srcpad)));
return data;
}
/* this function is a chain wrapper for non-event-aware plugins,
* it'll simply dispatch the events to the (default) event handler */
static void
gst_opt_scheduler_chain_wrapper (GstPad *sinkpad, GstData *data)
{
if (GST_IS_EVENT (data)) {
gst_pad_send_event (sinkpad, GST_EVENT (data));
}
else {
GST_RPAD_CHAINFUNC (sinkpad) (sinkpad, data);
}
}
static void
clear_queued (GstData *data, gpointer user_data)
{
gst_data_unref (data);
}
static void
pad_clear_queued (GstPad *srcpad, gpointer user_data)
{
GList *buflist = GST_PAD_BUFLIST (srcpad);
if (buflist) {
GST_INFO ( "need to clear some buffers");
g_list_foreach (buflist, (GFunc) clear_queued, NULL);
g_list_free (buflist);
GST_PAD_BUFLIST (srcpad) = NULL;
}
}
static gboolean
gst_opt_scheduler_event_wrapper (GstPad *srcpad, GstEvent *event)
{
gboolean flush;
GST_LOG ("intercepting event %d on pad %s:%s",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (srcpad));
/* figure out if this is a flush event */
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH:
flush = TRUE;
break;
case GST_EVENT_SEEK:
case GST_EVENT_SEEK_SEGMENT:
flush = GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH;
break;
default:
flush = FALSE;
break;
}
if (flush) {
GST_LOG ("event is flush");
pad_clear_queued (srcpad, NULL);
}
return GST_RPAD_EVENTFUNC (srcpad) (srcpad, event);
}
/* setup the scheduler context for a group. The right schedule function
* is selected based on the group type and cothreads are created if
* needed */
static void
setup_group_scheduler (GstOptScheduler *osched, GstOptSchedulerGroup *group)
{
GroupScheduleFunction wrapper;
wrapper = unknown_group_schedule_function;
/* figure out the wrapper function for this group */
if (group->type == GST_OPT_SCHEDULER_GROUP_GET)
wrapper = get_group_schedule_function;
else if (group->type == GST_OPT_SCHEDULER_GROUP_LOOP)
wrapper = loop_group_schedule_function;
#ifdef USE_COTHREADS
if (!(group->flags & GST_OPT_SCHEDULER_GROUP_SCHEDULABLE)) {
do_cothread_create (group->cothread, osched->context,
(cothread_func) wrapper, 0, (char **) group);
}
else {
do_cothread_setfunc (group->cothread, osched->context,
(cothread_func) wrapper, 0, (char **) group);
}
#else
group->schedulefunc = wrapper;
group->argc = 0;
group->argv = (char **) group;
#endif
group->flags |= GST_OPT_SCHEDULER_GROUP_SCHEDULABLE;
}
static GstElementStateReturn
gst_opt_scheduler_state_transition (GstScheduler *sched, GstElement *element, gint transition)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GstOptSchedulerGroup *group;
GstElementStateReturn res = GST_STATE_SUCCESS;
GST_INFO ( "element \"%s\" state change %d", GST_ELEMENT_NAME (element), transition);
/* we check the state of the managing pipeline here */
if (GST_IS_BIN (element)) {
if (GST_SCHEDULER_PARENT (sched) == element) {
GST_INFO ( "parent \"%s\" changed state", GST_ELEMENT_NAME (element));
switch (transition) {
case GST_STATE_PLAYING_TO_PAUSED:
GST_INFO ( "setting scheduler state to stopped");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_STOPPED;
break;
case GST_STATE_PAUSED_TO_PLAYING:
GST_INFO ( "setting scheduler state to running");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_RUNNING;
break;
default:
GST_INFO ( "no interesting state change, doing nothing");
}
}
return res;
}
/* we don't care about decoupled elements after this */
if (GST_ELEMENT_IS_DECOUPLED (element))
return GST_STATE_SUCCESS;
/* get the group of the element */
group = GST_ELEMENT_SCHED_GROUP (element);
switch (transition) {
case GST_STATE_PAUSED_TO_PLAYING:
/* an element withut a group has to be an unlinked src, sink
* filter element */
if (!group) {
GST_INFO ( "element \"%s\" has no group", GST_ELEMENT_NAME (element));
res = GST_STATE_FAILURE;
}
/* else construct the scheduling context of this group and enable it */
else {
setup_group_scheduler (osched, group);
group_element_set_enabled (group, element, TRUE);
}
break;
case GST_STATE_PLAYING_TO_PAUSED:
/* if the element still has a group, we disable it */
if (group)
group_element_set_enabled (group, element, FALSE);
break;
case GST_STATE_PAUSED_TO_READY:
{
GList *pads = (GList *) gst_element_get_pad_list (element);
g_list_foreach (pads, (GFunc) pad_clear_queued, NULL);
break;
}
default:
break;
}
return res;
}
static void
gst_opt_scheduler_scheduling_change (GstScheduler *sched, GstElement *element)
{
g_warning ("scheduling change, implement me");
}
static void
get_group (GstElement *element, GstOptSchedulerGroup **group)
{
GstOptSchedulerCtx *ctx;
/*GList *pads;*/
ctx = GST_ELEMENT_SCHED_CONTEXT (element);
if (ctx)
*group = ctx->group;
else
*group = NULL;
}
/*
* the idea is to put the two elements into the same group.
* - When no element is inside a group, we create a new group and add
* the elements to it.
* - When one of the elements has a group, add the other element to
* that group
* - if both of the elements have a group, we merge the groups, which
* will also merge the chains.
*/
static GstOptSchedulerGroup*
group_elements (GstOptScheduler *osched, GstElement *element1, GstElement *element2)
{
GstOptSchedulerGroup *group1, *group2, *group = NULL;
get_group (element1, &group1);
get_group (element2, &group2);
/* none of the elements is added to a group, create a new group
* and chain to add the elements to */
if (!group1 && !group2) {
GstOptSchedulerChain *chain;
GST_INFO ( "creating new group to hold \"%s\" and \"%s\"",
GST_ELEMENT_NAME (element1), GST_ELEMENT_NAME (element2));
chain = create_chain (osched);
group = create_group (chain, element1);
add_to_group (group, element2);
}
/* the first element has a group */
else if (group1) {
GST_INFO ( "adding \"%s\" to \"%s\"'s group",
GST_ELEMENT_NAME (element2), GST_ELEMENT_NAME (element1));
/* the second element also has a group, merge */
if (group2)
merge_groups (group1, group2);
/* the second element has no group, add it to the group
* of the first element */
else
add_to_group (group1, element2);
group = group1;
}
/* element1 has no group, element2 does. Add element1 to the
* group of element2 */
else {
GST_INFO ( "adding \"%s\" to \"%s\"'s group",
GST_ELEMENT_NAME (element1), GST_ELEMENT_NAME (element2));
add_to_group (group2, element1);
group = group2;
}
return group;
}
/*
* increment link counts between groups
*/
static void
group_inc_link (GstOptSchedulerGroup *group1, GstOptSchedulerGroup *group2)
{
GSList *links = group1->group_links;
gboolean done = FALSE;
GstOptSchedulerGroupLink *link;
/* first try to find a previous link */
while (links && !done) {
link = (GstOptSchedulerGroupLink *) links->data;
links = g_slist_next (links);
if (IS_GROUP_LINK (link, group1, group2)) {
/* we found a link to this group, increment the link count */
link->count++;
GST_INFO ( "incremented group link count between %p and %p to %d",
group1, group2, link->count);
done = TRUE;
}
}
if (!done) {
/* no link was found, create a new one */
link = g_new0 (GstOptSchedulerGroupLink, 1);
link->group1 = group1;
link->group2 = group2;
link->count = 1;
group1->group_links = g_slist_prepend (group1->group_links, link);
group2->group_links = g_slist_prepend (group2->group_links, link);
GST_INFO ( "added group link count between %p and %p",
group1, group2);
}
}
/*
* decrement link counts between groups, returns TRUE if the link count reaches 0
*/
static gboolean
group_dec_link (GstOptSchedulerGroup *group1, GstOptSchedulerGroup *group2)
{
GSList *links = group1->group_links;
gboolean res = FALSE;
GstOptSchedulerGroupLink *link;
while (links) {
link = (GstOptSchedulerGroupLink *) links->data;
links = g_slist_next (links);
if (IS_GROUP_LINK (link, group1, group2)) {
link->count--;
GST_INFO ( "link count between %p and %p is now %d",
group1, group2, link->count);
if (link->count == 0) {
group1->group_links = g_slist_remove (group1->group_links, link);
group2->group_links = g_slist_remove (group2->group_links, link);
g_free (link);
GST_INFO ( "removed group link between %p and %p",
group1, group2);
res = TRUE;
}
break;
}
}
return res;
}
typedef enum {
GST_OPT_INVALID,
GST_OPT_GET_TO_CHAIN,
GST_OPT_LOOP_TO_CHAIN,
GST_OPT_GET_TO_LOOP,
GST_OPT_CHAIN_TO_CHAIN,
GST_OPT_CHAIN_TO_LOOP,
GST_OPT_LOOP_TO_LOOP,
} LinkType;
/*
* Entry points for this scheduler.
*/
static void
gst_opt_scheduler_setup (GstScheduler *sched)
{
#ifdef USE_COTHREADS
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
/* first create thread context */
if (osched->context == NULL) {
GST_DEBUG ( "initializing cothread context");
osched->context = do_cothread_context_init ();
}
#endif
}
static void
gst_opt_scheduler_reset (GstScheduler *sched)
{
#ifdef USE_COTHREADS
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GSList *chains = osched->chains;
while (chains) {
GstOptSchedulerChain *chain = (GstOptSchedulerChain *) chains->data;
GSList *groups = chain->groups;
while (groups) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) groups->data;
destroy_group_scheduler (group);
groups = groups->next;
}
chains = chains->next;
}
if (osched->context) {
do_cothread_context_destroy (osched->context);
osched->context = NULL;
}
#endif
}
static void
gst_opt_scheduler_add_element (GstScheduler *sched, GstElement *element)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GstOptSchedulerCtx *ctx;
const GList *pads;
GST_INFO ( "adding element \"%s\" to scheduler", GST_ELEMENT_NAME (element));
/* decoupled elements are not added to the scheduler lists */
if (GST_ELEMENT_IS_DECOUPLED (element))
return;
ctx = g_new0 (GstOptSchedulerCtx, 1);
GST_ELEMENT_SCHED_CONTEXT (element) = ctx;
ctx->flags = GST_OPT_SCHEDULER_CTX_DISABLED;
/* set event handler on all pads here so events work unconnected too;
* in _link, it can be overruled if need be */
/* FIXME: we should also do this when new pads on the element are created;
but there are no hooks, so we do it again in _link */
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD (pad)) continue;
GST_RPAD_EVENTHANDLER (pad) = GST_RPAD_EVENTFUNC (pad);
}
/* loop based elements *always* end up in their own group. It can eventually
* be merged with another group when a link is made */
if (element->loopfunc) {
GstOptSchedulerGroup *group;
GstOptSchedulerChain *chain;
chain = create_chain (osched);
group = create_group (chain, element);
group->entry = element;
group->type = GST_OPT_SCHEDULER_GROUP_LOOP;
GST_INFO ( "added element \"%s\" as loop based entry", GST_ELEMENT_NAME (element));
}
}
static void
gst_opt_scheduler_remove_element (GstScheduler *sched, GstElement *element)
{
GstOptSchedulerGroup *group;
GST_INFO ( "removing element \"%s\" from scheduler", GST_ELEMENT_NAME (element));
/* decoupled elements are not added to the scheduler lists and should therefore
* no be removed */
if (GST_ELEMENT_IS_DECOUPLED (element))
return;
/* the element is guaranteed to live in it's own group/chain now */
get_group (element, &group);
if (group) {
remove_from_group (group, element);
}
g_free (GST_ELEMENT_SCHED_CONTEXT (element));
GST_ELEMENT_SCHED_CONTEXT (element) = NULL;
}
static void
gst_opt_scheduler_lock_element (GstScheduler *sched, GstElement *element)
{
//GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
g_warning ("lock element, implement me");
}
static void
gst_opt_scheduler_unlock_element (GstScheduler *sched, GstElement *element)
{
//GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
g_warning ("unlock element, implement me");
}
static gboolean
gst_opt_scheduler_yield (GstScheduler *sched, GstElement *element)
{
#ifdef USE_COTHREADS
/* yield hands control to the main cothread context if the requesting
* element is the entry point of the group */
GstOptSchedulerGroup *group;
get_group (element, &group);
if (group && group->entry == element)
do_cothread_switch (do_cothread_get_main (((GstOptScheduler*)sched)->context));
return FALSE;
#else
g_warning ("element %s performs a yield, please fix the element",
GST_ELEMENT_NAME (element));
return TRUE;
#endif
}
static gboolean
gst_opt_scheduler_interrupt (GstScheduler *sched, GstElement *element)
{
GST_INFO ( "interrupt from \"%s\"",
GST_ELEMENT_NAME (element));
#ifdef USE_COTHREADS
do_cothread_switch (do_cothread_get_main (((GstOptScheduler*)sched)->context));
return FALSE;
#else
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GST_INFO ( "scheduler set interrupted state");
osched->state = GST_OPT_SCHEDULER_STATE_INTERRUPTED;
}
return TRUE;
#endif
}
static void
gst_opt_scheduler_error (GstScheduler *sched, GstElement *element)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GstOptSchedulerGroup *group;
get_group (element, &group);
if (group)
group_error_handler (group);
osched->state = GST_OPT_SCHEDULER_STATE_ERROR;
}
/* link pads, merge groups and chains */
static void
gst_opt_scheduler_pad_link (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
LinkType type = GST_OPT_INVALID;
GstElement *element1, *element2;
GST_INFO ( "pad link between \"%s:%s\" and \"%s:%s\"",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
element1 = GST_PAD_PARENT (srcpad);
element2 = GST_PAD_PARENT (sinkpad);
/* first we need to figure out what type of link we're dealing
* with */
if (element1->loopfunc && element2->loopfunc)
type = GST_OPT_LOOP_TO_LOOP;
else {
if (element1->loopfunc) {
if (GST_RPAD_CHAINFUNC (sinkpad))
type = GST_OPT_LOOP_TO_CHAIN;
}
else if (element2->loopfunc) {
if (GST_RPAD_GETFUNC (srcpad)) {
type = GST_OPT_GET_TO_LOOP;
/* this could be tricky, the get based source could
* already be part of a loop based group in another pad,
* we assert on that for now */
if (GST_ELEMENT_SCHED_CONTEXT (element1) != NULL &&
GST_ELEMENT_SCHED_GROUP (element1) != NULL)
{
GstOptSchedulerGroup *group = GST_ELEMENT_SCHED_GROUP (element1);
/* if the loop based element is the entry point we're ok, if it
* isn't then we have multiple loop based elements in this group */
if (group->entry != element2) {
g_error ("internal error: cannot schedule get to loop in multi-loop based group");
return;
}
}
}
else
type = GST_OPT_CHAIN_TO_LOOP;
}
else {
if (GST_RPAD_GETFUNC (srcpad) && GST_RPAD_CHAINFUNC (sinkpad)) {
type = GST_OPT_GET_TO_CHAIN;
/* the get based source could already be part of a loop
* based group in another pad, we assert on that for now */
if (GST_ELEMENT_SCHED_CONTEXT (element1) != NULL &&
GST_ELEMENT_SCHED_GROUP (element1) != NULL)
{
GstOptSchedulerGroup *group = GST_ELEMENT_SCHED_GROUP (element1);
/* if the get based element is the entry point we're ok, if it
* isn't then we have a mixed loop/chain based group */
if (group->entry != element1) {
g_error ("internal error: cannot schedule get to chain with mixed loop/chain based group");
return;
}
}
}
else
type = GST_OPT_CHAIN_TO_CHAIN;
}
}
/* since we can't set event handlers on pad creation after addition, it is
* best we set all of them again to the default before linking */
GST_RPAD_EVENTHANDLER (srcpad) = GST_RPAD_EVENTFUNC (srcpad);
GST_RPAD_EVENTHANDLER (sinkpad) = GST_RPAD_EVENTFUNC (sinkpad);
/* for each link type, perform specific actions */
switch (type) {
case GST_OPT_GET_TO_CHAIN:
{
GstOptSchedulerGroup *group = NULL;
GST_INFO ( "get to chain based link");
/* setup get/chain handlers */
GST_RPAD_GETHANDLER (srcpad) = GST_RPAD_GETFUNC (srcpad);
if (GST_ELEMENT_IS_EVENT_AWARE (element2))
GST_RPAD_CHAINHANDLER (sinkpad) = GST_RPAD_CHAINFUNC (sinkpad);
else
GST_RPAD_CHAINHANDLER (sinkpad) = gst_opt_scheduler_chain_wrapper;
/* the two elements should be put into the same group,
* this also means that they are in the same chain automatically */
group = group_elements (osched, element1, element2);
/* if there is not yet an entry in the group, select the source
* element as the entry point */
if (!group->entry) {
group->entry = element1;
group->type = GST_OPT_SCHEDULER_GROUP_GET;
GST_INFO ( "setting \"%s\" as entry point of _get-based group %p",
GST_ELEMENT_NAME (element1), group);
}
break;
}
case GST_OPT_LOOP_TO_CHAIN:
case GST_OPT_CHAIN_TO_CHAIN:
GST_INFO ( "loop/chain to chain based link");
if (GST_ELEMENT_IS_EVENT_AWARE (element2))
GST_RPAD_CHAINHANDLER (sinkpad) = GST_RPAD_CHAINFUNC (sinkpad);
else
GST_RPAD_CHAINHANDLER (sinkpad) = gst_opt_scheduler_chain_wrapper;
/* the two elements should be put into the same group,
* this also means that they are in the same chain automatically,
* in case of a loop-based element1, there will be a group for element1 and
* element2 will be added to it. */
group_elements (osched, element1, element2);
break;
case GST_OPT_GET_TO_LOOP:
GST_INFO ( "get to loop based link");
GST_RPAD_GETHANDLER (srcpad) = GST_RPAD_GETFUNC (srcpad);
/* the two elements should be put into the same group,
* this also means that they are in the same chain automatically,
* element2 is loop-based so it already has a group where element1
* will be added to */
group_elements (osched, element1, element2);
break;
case GST_OPT_CHAIN_TO_LOOP:
case GST_OPT_LOOP_TO_LOOP:
{
GstOptSchedulerGroup *group1, *group2;
GST_INFO ( "chain/loop to loop based link");
GST_RPAD_CHAINHANDLER (sinkpad) = gst_opt_scheduler_loop_wrapper;
GST_RPAD_GETHANDLER (srcpad) = gst_opt_scheduler_get_wrapper;
/* events on the srcpad have to be intercepted as we might need to
* flush the buffer lists, so override the given eventfunc */
GST_RPAD_EVENTHANDLER (srcpad) = gst_opt_scheduler_event_wrapper;
group1 = GST_ELEMENT_SCHED_GROUP (element1);
group2 = GST_ELEMENT_SCHED_GROUP (element2);
g_assert (group2 != NULL);
/* group2 is guaranteed to exist as it contains a loop-based element.
* group1 only exists if element1 is linked to some other element */
if (!group1) {
/* create a new group for element1 as it cannot be merged into another group
* here. we create the group in the same chain as the loop-based element. */
GST_INFO ( "creating new group for element %s", GST_ELEMENT_NAME (element1));
group1 = create_group (group2->chain, element1);
}
else {
/* both elements are already in a group, make sure they are added to
* the same chain */
merge_chains (group1->chain, group2->chain);
}
group_inc_link (group1, group2);
break;
}
case GST_OPT_INVALID:
g_error ("(internal error) invalid element link, what are you doing?");
break;
}
}
/*
* checks if an element is still linked to some other element in the group.
* no checking is done on the brokenpad arg
*/
static gboolean
element_has_link_with_group (GstElement *element, GstOptSchedulerGroup *group, GstPad *brokenpad)
{
gboolean linked = FALSE;
const GList *pads;
/* see if the element has no more links to the peer group */
pads = gst_element_get_pad_list (element);
while (pads && !linked) {
GstPad *pad = GST_PAD_CAST (pads->data);
pads = g_list_next (pads);
/* we only operate on real pads and on the pad that is not broken */
if (!GST_IS_REAL_PAD (pad) || pad == brokenpad)
continue;
if (GST_PAD_PEER (pad)) {
GstElement *parent;
GstOptSchedulerGroup *parentgroup;
/* see in what group this element is */
parent = GST_PAD_PARENT (GST_PAD_PEER (pad));
/* links with decoupled elements are valid */
if (GST_ELEMENT_IS_DECOUPLED (parent)) {
linked = TRUE;
}
else {
/* for non-decoupled elements we need to check the group */
get_group (parent, &parentgroup);
/* if it's in the same group, we're still linked */
if (parentgroup == group)
linked = TRUE;
}
}
}
return linked;
}
/*
* checks if a target group is still reachable from the group without taking the broken
* group link into account.
*/
static gboolean
group_can_reach_group (GstOptSchedulerGroup *group, GstOptSchedulerGroup *target)
{
gboolean reachable = FALSE;
const GSList *links = group->group_links;
GST_INFO ( "checking if group %p can reach %p",
group, target);
/* seems like we found the target element */
if (group == target) {
GST_INFO ( "found way to reach %p", target);
return TRUE;
}
/* if the group is marked as visited, we don't need to check here */
if (GST_OPT_SCHEDULER_GROUP_IS_FLAG_SET (group, GST_OPT_SCHEDULER_GROUP_VISITED)) {
GST_INFO ( "already visited %p", group);
return FALSE;
}
/* mark group as visited */
GST_OPT_SCHEDULER_GROUP_SET_FLAG (group, GST_OPT_SCHEDULER_GROUP_VISITED);
while (links && !reachable) {
GstOptSchedulerGroupLink *link = (GstOptSchedulerGroupLink *) links->data;
GstOptSchedulerGroup *other;
links = g_slist_next (links);
/* find other group in this link */
other = OTHER_GROUP_LINK (link, group);
GST_INFO ( "found link from %p to %p, count %d",
group, other, link->count);
/* check if we can reach the target recursiveley */
reachable = group_can_reach_group (other, target);
}
/* unset the visited flag, note that this is not optimal as we might be checking
* groups several times when they are reachable with a loop. An alternative would be
* to not clear the group flag at this stage but clear all flags in the chain when
* all groups are checked. */
GST_OPT_SCHEDULER_GROUP_UNSET_FLAG (group, GST_OPT_SCHEDULER_GROUP_VISITED);
GST_INFO ( "leaving group %p with %s", group, (reachable ? "TRUE":"FALSE"));
return reachable;
}
static void
gst_opt_scheduler_pad_unlink (GstScheduler *sched, GstPad *srcpad, GstPad *sinkpad)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GstElement *element1, *element2;
GstOptSchedulerGroup *group1, *group2;
GST_INFO ( "pad unlink between \"%s:%s\" and \"%s:%s\"",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
element1 = GST_PAD_PARENT (srcpad);
element2 = GST_PAD_PARENT (sinkpad);
get_group (element1, &group1);
get_group (element2, &group2);
/* for decoupled elements (that are never put into a group) we use the
* group of the peer element for the remainder of the algorithm */
if (GST_ELEMENT_IS_DECOUPLED (element1)) {
group1 = group2;
}
if (GST_ELEMENT_IS_DECOUPLED (element2)) {
group2 = group1;
}
/* if one the elements has no group (anymore) we don't really care
* about the link */
if (!group1 || !group2) {
GST_INFO ( "one (or both) of the elements is not in a group, not interesting");
return;
}
/* easy part, groups are different */
if (group1 != group2) {
gboolean zero;
GST_INFO ( "elements are in different groups");
/* we can remove the links between the groups now */
zero = group_dec_link (group1, group2);
/* if the groups are not directly connected anymore, we have to perform a recursive check
* to see if they are really unlinked */
if (zero) {
gboolean still_link;
GstOptSchedulerChain *chain;
/* see if group1 and group2 are still connected in any indirect way */
still_link = group_can_reach_group (group1, group2);
GST_INFO ( "group %p %s reach group %p", group1, (still_link ? "can":"can't"), group2);
if (!still_link) {
/* groups are really disconnected, migrate one group to a new chain */
chain = create_chain (osched);
chain_recursively_migrate_group (chain, group1);
GST_INFO ( "migrated group %p to new chain %p", group1, chain);
}
}
else {
GST_INFO ( "group %p still has direct link with group %p", group1, group2);
}
}
/* hard part, groups are equal */
else {
gboolean still_link1, still_link2;
GstOptSchedulerGroup *group;
/* since group1 == group2, it doesn't matter which group we take */
group = group1;
GST_INFO ( "elements are in the same group %p", group);
/* check if the element is still linked to some other element in the group,
* we pass the pad that is broken up as an arg because a link on that pad
* is not valid anymore.
* Note that this check is only to make sure that a single element can be removed
* completely from the group, we also have to check for migrating several
* elements to a new group. */
still_link1 = element_has_link_with_group (element1, group, srcpad);
still_link2 = element_has_link_with_group (element2, group, sinkpad);
/* if there is still a link, we don't need to break this group */
if (still_link1 && still_link2) {
GST_INFO ( "elements still have links with other elements in the group");
/* FIXME it's possible that we have to break the group/chain. This heppens when
* the src element recursiveley has links with other elements in the group but not
* with all elements. */
g_warning ("opt: unlink elements in same group: implement me");
return;
}
/* now check which one of the elements we can remove from the group */
if (!still_link1) {
/* we only remove elements that are not the entry point of a loop based
* group and are not decoupled */
if (!(group->entry == element1 &&
group->type == GST_OPT_SCHEDULER_GROUP_LOOP) &&
!GST_ELEMENT_IS_DECOUPLED (element1))
{
GST_INFO ( "element1 is separated from the group");
remove_from_group (group, element1);
}
else {
GST_INFO ( "element1 is decoupled or entry in loop based group");
}
}
if (!still_link2) {
/* we only remove elements that are not the entry point of a loop based
* group and are not decoupled */
if (!(group->entry == element2 &&
group->type == GST_OPT_SCHEDULER_GROUP_LOOP) &&
!GST_ELEMENT_IS_DECOUPLED (element2))
{
GST_INFO ( "element2 is separated from the group");
remove_from_group (group, element2);
}
else {
GST_INFO ( "element2 is decoupled or entry in loop based group");
}
}
}
}
static void
gst_opt_scheduler_pad_select (GstScheduler *sched, GList *padlist)
{
//GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
g_warning ("pad select, implement me");
}
static GstClockReturn
gst_opt_scheduler_clock_wait (GstScheduler *sched, GstElement *element,
GstClockID id, GstClockTimeDiff *jitter)
{
return gst_clock_id_wait (id, jitter);
}
/* a scheduler iteration is done by looping and scheduling the active chains */
static GstSchedulerState
gst_opt_scheduler_iterate (GstScheduler *sched)
{
GstSchedulerState state = GST_SCHEDULER_STATE_STOPPED;
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
gint iterations = osched->iterations;
osched->state = GST_OPT_SCHEDULER_STATE_RUNNING;
while (iterations) {
gboolean scheduled = FALSE;
GSList *chains;
/* we have to schedule each of the scheduler chains now */
chains = osched->chains;
while (chains) {
GstOptSchedulerChain *chain = (GstOptSchedulerChain *) chains->data;
ref_chain (chain);
/* if the chain is not disabled, schedule it */
if (!GST_OPT_SCHEDULER_CHAIN_IS_DISABLED (chain)) {
schedule_chain (chain);
scheduled = TRUE;
}
/* don't schedule any more chains when in error */
if (osched->state == GST_OPT_SCHEDULER_STATE_ERROR) {
GST_ERROR_OBJECT (sched, "in error state");
break;
}
else if (osched->state == GST_OPT_SCHEDULER_STATE_INTERRUPTED) {
GST_DEBUG_OBJECT (osched, "got interrupted, continue with next chain");
osched->state = GST_OPT_SCHEDULER_STATE_RUNNING;
}
GST_LOG_OBJECT (sched, "iterate scheduled %p", chain);
chains = g_slist_next (chains);
unref_chain (chain);
}
/* at this point it's possible that the scheduler state is
* in error, we then return an error */
if (osched->state == GST_OPT_SCHEDULER_STATE_ERROR) {
state = GST_SCHEDULER_STATE_ERROR;
break;
}
else {
/* if chains were scheduled, return our current state */
if (scheduled)
state = GST_SCHEDULER_STATE (sched);
/* if no chains were scheduled, we say we are stopped */
else {
state = GST_SCHEDULER_STATE_STOPPED;
break;
}
}
if (iterations > 0)
iterations--;
}
return state;
}
static void
gst_opt_scheduler_show (GstScheduler *sched)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER_CAST (sched);
GSList *chains;
g_print ("iterations: %d\n", osched->iterations);
g_print ("max recursion: %d\n", osched->max_recursion);
chains = osched->chains;
while (chains) {
GstOptSchedulerChain *chain = (GstOptSchedulerChain *) chains->data;
GSList *groups = chain->groups;
chains = g_slist_next (chains);
g_print ("+- chain %p: refcount %d, %d groups, %d enabled, flags %d\n",
chain, chain->refcount, chain->num_groups, chain->num_enabled, chain->flags);
while (groups) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) groups->data;
GSList *elements = group->elements;
groups = g_slist_next (groups);
g_print (" +- group %p: refcount %d, %d elements, %d enabled, flags %d, entry %s, %s\n",
group, group->refcount, group->num_elements, group->num_enabled, group->flags,
(group->entry ? GST_ELEMENT_NAME (group->entry): "(none)"),
(group->type == GST_OPT_SCHEDULER_GROUP_GET ? "get-based" : "loop-based") );
while (elements) {
GstElement *element = (GstElement *) elements->data;
elements = g_slist_next (elements);
g_print (" +- element %s\n", GST_ELEMENT_NAME (element));
}
}
}
}
static void
gst_opt_scheduler_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstOptScheduler *osched;
g_return_if_fail (GST_IS_OPT_SCHEDULER (object));
osched = GST_OPT_SCHEDULER_CAST (object);
switch (prop_id) {
case ARG_ITERATIONS:
g_value_set_int (value, osched->iterations);
break;
case ARG_MAX_RECURSION:
g_value_set_int (value, osched->max_recursion);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_opt_scheduler_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstOptScheduler *osched;
g_return_if_fail (GST_IS_OPT_SCHEDULER (object));
osched = GST_OPT_SCHEDULER_CAST (object);
switch (prop_id) {
case ARG_ITERATIONS:
osched->iterations = g_value_get_int (value);
break;
case ARG_MAX_RECURSION:
osched->max_recursion = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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