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gstreamer/gst/schedulers/gstoptimalscheduler.c
Thomas Vander Stichele 050631f63b fix for #142813 - deadlock in opt 
Original commit message from CVS:
fix for #142813 - deadlock in opt
2004-07-20 10:57:38 +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.
*/
#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 (elem)->sched_private))
#define GST_ELEMENT_SCHED_GROUP(elem) (GST_ELEMENT_SCHED_CONTEXT (elem)->group)
/* need this first macro to not run into lvalue casts */
#define GST_PAD_DATAPEN(pad) (GST_REAL_PAD(pad)->sched_private)
#define GST_PAD_DATALIST(pad) ((GList*) GST_PAD_DATAPEN(pad))
#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_VISITED GST_ELEMENT_SCHEDULER_PRIVATE2
#define GST_ELEMENT_IS_VISITED(element) GST_FLAG_IS_SET((element), GST_ELEMENT_VISITED)
#define GST_ELEMENT_SET_VISITED(element) GST_FLAG_SET((element), GST_ELEMENT_VISITED)
#define GST_ELEMENT_UNSET_VISITED(element) GST_FLAG_UNSET((element), GST_ELEMENT_VISITED)
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))
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;
gint live_groups;
gint live_chains;
gint live_links;
};
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_SET_DIRTY(chain) ((chain)->flags |= GST_OPT_SCHEDULER_CHAIN_DIRTY)
#define GST_OPT_SCHEDULER_CHAIN_SET_CLEAN(chain) ((chain)->flags &= ~GST_OPT_SCHEDULER_CHAIN_DIRTY)
#define GST_OPT_SCHEDULER_CHAIN_IS_DIRTY(chain) ((chain)->flags & GST_OPT_SCHEDULER_CHAIN_DIRTY)
#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_UNKNOWN = 3,
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 *src; /* the group we are linked with */
GstOptSchedulerGroup *sink; /* the group we are linked with */
gint count; /* the number of links with the group */
};
#define IS_GROUP_LINK(link, srcg, sinkg) ((link->src == srcg && link->sink == sinkg) || \
(link->sink == srcg && link->src == sinkg))
#define OTHER_GROUP_LINK(link, group) (link->src == group ? link->sink : link->src)
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 */
GstOptScheduler *sched; /* the scheduler */
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;
};
/*
* A group is a set of elements through which data can flow without switching
* cothreads or without invoking the scheduler's run queue.
*/
static GstOptSchedulerGroup *ref_group (GstOptSchedulerGroup * group);
static GstOptSchedulerGroup *unref_group (GstOptSchedulerGroup * group);
static GstOptSchedulerGroup *create_group (GstOptSchedulerChain * chain,
GstElement * element, GstOptSchedulerGroupType type);
static void destroy_group (GstOptSchedulerGroup * group);
static GstOptSchedulerGroup *add_to_group (GstOptSchedulerGroup * group,
GstElement * element, gboolean with_links);
static GstOptSchedulerGroup *remove_from_group (GstOptSchedulerGroup * group,
GstElement * element);
static void group_dec_links_for_element (GstOptSchedulerGroup * group,
GstElement * element);
static void group_inc_links_for_element (GstOptSchedulerGroup * group,
GstElement * element);
static GstOptSchedulerGroup *merge_groups (GstOptSchedulerGroup * group1,
GstOptSchedulerGroup * group2);
static void setup_group_scheduler (GstOptScheduler * osched,
GstOptSchedulerGroup * group);
static void destroy_group_scheduler (GstOptSchedulerGroup * group);
static void group_error_handler (GstOptSchedulerGroup * group);
static void group_element_set_enabled (GstOptSchedulerGroup * group,
GstElement * element, gboolean enabled);
static gboolean schedule_group (GstOptSchedulerGroup * group);
static void get_group (GstElement * element, GstOptSchedulerGroup ** group);
/*
* A chain is a set of groups that are linked to each other.
*/
static void destroy_chain (GstOptSchedulerChain * chain);
static GstOptSchedulerChain *create_chain (GstOptScheduler * osched);
static GstOptSchedulerChain *ref_chain (GstOptSchedulerChain * chain);
static GstOptSchedulerChain *unref_chain (GstOptSchedulerChain * chain);
static GstOptSchedulerChain *add_to_chain (GstOptSchedulerChain * chain,
GstOptSchedulerGroup * group);
static GstOptSchedulerChain *remove_from_chain (GstOptSchedulerChain * chain,
GstOptSchedulerGroup * group);
static GstOptSchedulerChain *merge_chains (GstOptSchedulerChain * chain1,
GstOptSchedulerChain * chain2);
static void chain_recursively_migrate_group (GstOptSchedulerChain * chain,
GstOptSchedulerGroup * group);
static void chain_group_set_enabled (GstOptSchedulerChain * chain,
GstOptSchedulerGroup * group, gboolean enabled);
static void schedule_chain (GstOptSchedulerChain * chain);
/*
* The schedule functions are the entry points for cothreads, or called directly
* by gst_opt_scheduler_schedule_run_queue
*/
static int get_group_schedule_function (int argc, char *argv[]);
static int loop_group_schedule_function (int argc, char *argv[]);
static int unknown_group_schedule_function (int argc, char *argv[]);
/*
* These wrappers are set on the pads as the chain handler (what happens when
* gst_pad_push is called) or get handler (for gst_pad_pull).
*/
static void gst_opt_scheduler_loop_wrapper (GstPad * sinkpad, GstData * data);
static GstData *gst_opt_scheduler_get_wrapper (GstPad * srcpad);
/*
* Without cothreads, gst_pad_push or gst_pad_pull on a loop-based group will
* just queue the peer element on a list. We need to actually run the queue
* instead of relying on cothreads to do the switch for us.
*/
#ifndef USE_COTHREADS
static void gst_opt_scheduler_schedule_run_queue (GstOptScheduler * osched);
#endif
/*
* 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 */
};
/*
* Implementation of GstScheduler
*/
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 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 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->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->clock_wait = NULL;
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;
scheduler->live_groups = 0;
scheduler->live_chains = 0;
scheduler->live_links = 0;
}
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_PACKAGE, GST_ORIGIN);
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 *
create_chain (GstOptScheduler * osched)
{
GstOptSchedulerChain *chain;
chain = g_new0 (GstOptSchedulerChain, 1);
chain->sched = osched;
chain->refcount = 1;
chain->flags = GST_OPT_SCHEDULER_CHAIN_DISABLED;
osched->live_chains++;
gst_object_ref (GST_OBJECT (osched));
osched->chains = g_slist_prepend (osched->chains, chain);
GST_LOG ("new chain %p, %d live chains now", chain, osched->live_chains);
return chain;
}
static void
destroy_chain (GstOptSchedulerChain * chain)
{
GstOptScheduler *osched;
GST_LOG ("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);
osched->live_chains--;
GST_LOG ("%d live chains now", osched->live_chains);
gst_object_unref (GST_OBJECT (osched));
g_free (chain);
}
static GstOptSchedulerChain *
add_to_chain (GstOptSchedulerChain * chain, GstOptSchedulerGroup * group)
{
gboolean enabled;
GST_LOG ("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++;
enabled = GST_OPT_SCHEDULER_GROUP_IS_ENABLED (group);
if (enabled) {
/* we can now setup the scheduling of the group */
setup_group_scheduler (chain->sched, group);
chain->num_enabled++;
if (chain->num_enabled == chain->num_groups) {
GST_LOG ("enabling chain %p after adding of enabled group", chain);
GST_OPT_SCHEDULER_CHAIN_ENABLE (chain);
}
}
/* queue a resort of the group list, which determines which group will be run
* first. */
GST_OPT_SCHEDULER_CHAIN_SET_DIRTY (chain);
return chain;
}
static GstOptSchedulerChain *
remove_from_chain (GstOptSchedulerChain * chain, GstOptSchedulerGroup * group)
{
gboolean enabled;
GST_LOG ("removing group %p from chain %p", group, chain);
if (!chain)
return NULL;
g_assert (group);
g_assert (group->chain == chain);
enabled = GST_OPT_SCHEDULER_GROUP_IS_ENABLED (group);
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);
else {
/* removing an enabled group from the chain decrements the
* enabled counter */
if (enabled) {
chain->num_enabled--;
if (chain->num_enabled == 0) {
GST_LOG ("disabling chain %p after removal of the only enabled group",
chain);
GST_OPT_SCHEDULER_CHAIN_DISABLE (chain);
}
} else {
if (chain->num_enabled == chain->num_groups) {
GST_LOG ("enabling chain %p after removal of the only disabled group",
chain);
GST_OPT_SCHEDULER_CHAIN_ENABLE (chain);
}
}
}
GST_OPT_SCHEDULER_CHAIN_SET_DIRTY (chain);
chain = unref_chain (chain);
return chain;
}
static GstOptSchedulerChain *
merge_chains (GstOptSchedulerChain * chain1, GstOptSchedulerChain * chain2)
{
GSList *walk;
g_assert (chain1 != NULL);
GST_LOG ("merging chain %p and %p", chain1, chain2);
/* FIXME: document how chain2 can be NULL */
if (chain1 == chain2 || chain2 == NULL)
return chain1;
/* switch if it's more efficient */
if (chain1->num_groups < chain2->num_groups) {
GstOptSchedulerChain *tmp = chain2;
chain2 = chain1;
chain1 = tmp;
}
walk = chain2->groups;
while (walk) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) walk->data;
walk = g_slist_next (walk);
GST_LOG ("reparenting group %p from chain %p to %p", group, chain2, chain1);
ref_group (group);
remove_from_chain (chain2, group);
add_to_chain (chain1, group);
unref_group (group);
}
/* chain2 is now freed, if nothing else was referencing it before */
return chain1;
}
/* sorts the group list so that terminal sinks come first -- prevents pileup of
* datas in datapens */
static void
sort_chain (GstOptSchedulerChain * chain)
{
GSList *original = chain->groups;
GSList *new = NULL;
GSList *walk, *links, *this;
/* if there's only one group, just return */
if (!original->next)
return;
/* otherwise, we know that all groups are somehow linked together */
GST_LOG ("sorting chain %p (%d groups)", chain, g_slist_length (original));
/* first find the terminal sinks */
for (walk = original; walk;) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) walk->data;
this = walk;
walk = walk->next;
if (group->group_links) {
gboolean is_sink = TRUE;
for (links = group->group_links; links; links = links->next)
if (((GstOptSchedulerGroupLink *) links->data)->src == group)
is_sink = FALSE;
if (is_sink) {
/* found one */
original = g_slist_remove_link (original, this);
new = g_slist_concat (new, this);
}
}
}
g_assert (new != NULL);
/* now look for the elements that are linked to the terminal sinks */
for (walk = new; walk; walk = walk->next) {
GstOptSchedulerGroup *group = (GstOptSchedulerGroup *) walk->data;
for (links = group->group_links; links; links = links->next) {
this =
g_slist_find (original,
((GstOptSchedulerGroupLink *) links->data)->src);
if (this) {
original = g_slist_remove_link (original, this);
new = g_slist_concat (new, this);
}
}
}
g_assert (original == NULL);
chain->groups = new;
}
static void
chain_group_set_enabled (GstOptSchedulerChain * chain,
GstOptSchedulerGroup * group, gboolean enabled)
{
gboolean oldstate;
g_assert (group != NULL);
g_assert (chain != NULL);
GST_LOG
("request to %d group %p in chain %p, have %d groups enabled out of %d",
enabled, group, chain, chain->num_enabled, chain->num_groups);
oldstate = (GST_OPT_SCHEDULER_GROUP_IS_ENABLED (group) ? TRUE : FALSE);
if (oldstate == enabled) {
GST_LOG ("group %p in chain %p was in correct state", group, chain);
return;
}
if (enabled)
GST_OPT_SCHEDULER_GROUP_ENABLE (group);
else
GST_OPT_SCHEDULER_GROUP_DISABLE (group);
if (enabled) {
g_assert (chain->num_enabled < chain->num_groups);
chain->num_enabled++;
GST_DEBUG ("enable group %p in chain %p, now %d groups enabled out of %d",
group, chain, chain->num_enabled, chain->num_groups);
/* OK to call even if the scheduler (cothread context / schedulerfunc) was
setup already -- will get destroyed when the group is destroyed */
setup_group_scheduler (chain->sched, group);
if (chain->num_enabled == chain->num_groups) {
GST_DEBUG ("enable chain %p", chain);
GST_OPT_SCHEDULER_CHAIN_ENABLE (chain);
}
} else {
g_assert (chain->num_enabled > 0);
chain->num_enabled--;
GST_DEBUG ("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_DEBUG ("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 */
for (links = group->group_links; links; links = g_slist_next (links)) {
GstOptSchedulerGroupLink *link = (GstOptSchedulerGroupLink *) links->data;
chain_recursively_migrate_group (chain, OTHER_GROUP_LINK (link, group));
}
}
static GstOptSchedulerGroup *
ref_group (GstOptSchedulerGroup * group)
{
GST_LOG ("ref group %p %d->%d", group, group->refcount, group->refcount + 1);
group->refcount++;
return group;
}
static GstOptSchedulerGroup *
unref_group (GstOptSchedulerGroup * group)
{
GST_LOG ("unref group %p %d->%d", group,
group->refcount, group->refcount - 1);
if (--group->refcount == 0) {
destroy_group (group);
group = NULL;
}
return group;
}
static GstOptSchedulerGroup *
create_group (GstOptSchedulerChain * chain, GstElement * element,
GstOptSchedulerGroupType type)
{
GstOptSchedulerGroup *group;
group = g_new0 (GstOptSchedulerGroup, 1);
GST_LOG ("new group %p, type %d", group, type);
group->refcount = 1; /* float... */
group->flags = GST_OPT_SCHEDULER_GROUP_DISABLED;
group->type = type;
group->sched = chain->sched;
group->sched->live_groups++;
add_to_group (group, element, FALSE);
add_to_chain (chain, group);
group = unref_group (group); /* ...and sink. */
GST_LOG ("%d live groups now", group->sched->live_groups);
/* group's refcount is now 2 (one for the element, one for the chain) */
return group;
}
static void
destroy_group (GstOptSchedulerGroup * group)
{
GST_LOG ("destroy group %p", group);
g_assert (group != NULL);
g_assert (group->elements == NULL);
g_assert (group->chain == NULL);
g_assert (group->group_links == NULL);
if (group->flags & GST_OPT_SCHEDULER_GROUP_SCHEDULABLE)
destroy_group_scheduler (group);
group->sched->live_groups--;
GST_LOG ("%d live groups now", group->sched->live_groups);
g_free (group);
}
static GstOptSchedulerGroup *
add_to_group (GstOptSchedulerGroup * group, GstElement * element,
gboolean with_links)
{
g_assert (group != NULL);
g_assert (element != NULL);
GST_DEBUG ("adding element \"%s\" to group %p", GST_ELEMENT_NAME (element),
group);
if (GST_ELEMENT_IS_DECOUPLED (element)) {
GST_DEBUG ("element \"%s\" is decoupled, not adding to group %p",
GST_ELEMENT_NAME (element), group);
return group;
}
g_assert (GST_ELEMENT_SCHED_GROUP (element) == NULL);
/* first increment the links that this group has with other groups through
* this element */
if (with_links)
group_inc_links_for_element (group, element);
/* Ref the group... */
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 *
remove_from_group (GstOptSchedulerGroup * group, GstElement * element)
{
GST_DEBUG ("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);
/* first decrement the links that this group has with other groups through
* this element */
group_dec_links_for_element (group, element);
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, and mark it as unknown */
if (group->entry == element) {
group->entry = NULL;
group->type = GST_OPT_SCHEDULER_GROUP_UNKNOWN;
}
GST_ELEMENT_SCHED_GROUP (element) = NULL;
gst_object_unref (GST_OBJECT (element));
if (group->num_elements == 0) {
GST_LOG ("group %p is now empty", group);
/* don't know in what case group->chain would be NULL, but putting this here
in deference to 0.8 -- remove me in 0.9 */
if (group->chain) {
GST_LOG ("removing group %p from its chain", group);
chain_group_set_enabled (group->chain, group, FALSE);
remove_from_chain (group->chain, group);
}
}
group = unref_group (group);
return group;
}
/* count number of elements in the group. Have to be careful because
* decoupled elements are added as entry point but are not added to
* the elements list */
static gint
group_num_elements (GstOptSchedulerGroup * group)
{
gint num;
num = group->num_elements;
/* decoupled elements are not added to the group but are
* added as an entry */
if (group->entry) {
if (GST_ELEMENT_IS_DECOUPLED (group->entry)) {
num++;
}
}
return num;
}
/* check if an element is part of the given group. We have to be carefull
* as decoupled elements are added as entry but are not added to the elements
* list */
static gboolean
group_has_element (GstOptSchedulerGroup * group, GstElement * element)
{
if (group->entry == element)
return TRUE;
return (g_slist_find (group->elements, element) != NULL);
}
/* FIXME need to check if the groups are of the same type -- otherwise need to
setup the scheduler again, if it is setup */
static GstOptSchedulerGroup *
merge_groups (GstOptSchedulerGroup * group1, GstOptSchedulerGroup * group2)
{
g_assert (group1 != NULL);
GST_DEBUG ("merging groups %p and %p", group1, group2);
if (group1 == group2 || group2 == NULL)
return group1;
/* make sure they end up in the same chain */
merge_chains (group1->chain, group2->chain);
while (group2 && group2->elements) {
GstElement *element = (GstElement *) group2->elements->data;
group2 = remove_from_group (group2, element);
add_to_group (group1, element, TRUE);
}
return group1;
}
/* 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;
GST_DEBUG ("setup group %p scheduler, type %d", group, group->type);
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 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
group_error_handler (GstOptSchedulerGroup * group)
{
GST_DEBUG ("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_LOG
("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);
/* Note that if an unlinked PLAYING element is added to a bin, we have to
create a new group to hold the element, and this function will be called
before the group is added to the chain. Thus we have a valid case for
group->chain==NULL. */
if (enabled) {
g_assert (group->num_enabled < group->num_elements);
group->num_enabled++;
GST_DEBUG
("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) {
if (!group->chain) {
GST_DEBUG ("enable chainless group %p", group);
GST_OPT_SCHEDULER_GROUP_ENABLE (group);
} else {
GST_LOG ("enable group %p", group);
chain_group_set_enabled (group->chain, group, TRUE);
}
}
} else {
g_assert (group->num_enabled > 0);
group->num_enabled--;
GST_DEBUG
("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) {
if (!group->chain) {
GST_DEBUG ("disable chainless group %p", group);
GST_OPT_SCHEDULER_GROUP_DISABLE (group);
} else {
GST_LOG ("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);
/* FIXME, we return true here, while the group is actually
* not schedulable. We might want to disable the element that caused
* this group to be scheduled instead */
return TRUE;
}
#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, *lcopy;
lcopy = g_slist_copy (group->elements);
for (l = lcopy; l; l = l->next) {
GstElement *e = (GstElement *) l->data;
gst_object_ref (GST_OBJECT (e));
if (e->pre_run_func)
e->pre_run_func (e);
}
group->schedulefunc (group->argc, group->argv);
for (l = lcopy; l; l = l->next) {
GstElement *e = (GstElement *) l->data;
if (e->post_run_func)
e->post_run_func (e);
gst_object_unref (GST_OBJECT (e));
}
g_slist_free (lcopy);
}
return TRUE;
#endif
}
#ifndef USE_COTHREADS
static void
gst_opt_scheduler_schedule_run_queue (GstOptScheduler * osched)
{
GST_LOG_OBJECT (osched, "running queue: %d groups, recursed %d times",
g_list_length (osched->runqueue),
osched->recursion, g_list_length (osched->runqueue));
/* note that we have a ref on each group on the queue (unref after running) */
/* 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 holds refcount to group */
osched->runqueue = g_list_remove (osched->runqueue, group);
GST_LOG_OBJECT (osched, "scheduling group %p", group);
if (GST_OPT_SCHEDULER_GROUP_IS_ENABLED (group)) {
res = schedule_group (group);
} else {
GST_INFO_OBJECT (osched,
"group was disabled while it was on the queue, not scheduling");
res = TRUE;
}
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;
/* if the chain has changed, we need to resort the groups so we enter in the
proper place */
if (GST_OPT_SCHEDULER_CHAIN_IS_DIRTY (chain))
sort_chain (chain);
GST_OPT_SCHEDULER_CHAIN_SET_CLEAN (chain);
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 ("executing get-based group %p", group);
group->flags |= GST_OPT_SCHEDULER_GROUP_RUNNING;
while (pads) {
GstData *data;
GstPad *pad = GST_PAD (pads->data);
pads = g_list_next (pads);
/* skip sinks and ghostpads */
if (!GST_PAD_IS_SRC (pad) || !GST_IS_REAL_PAD (pad))
continue;
GST_DEBUG ("doing get and push on pad \"%s:%s\" in group %p",
GST_DEBUG_PAD_NAME (pad), group);
data = gst_pad_call_get_function (pad);
if (data) {
if (GST_EVENT_IS_INTERRUPT (data)) {
GST_DEBUG ("unreffing interrupt event %p", 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 ("executing loop-based group %p", group);
group->flags |= GST_OPT_SCHEDULER_GROUP_RUNNING;
GST_DEBUG ("calling loopfunc of element %s in group %p",
GST_ELEMENT_NAME (entry), group);
if (entry->loopfunc)
entry->loopfunc (entry);
else
group_error_handler (group);
GST_LOG ("returned from loopfunc 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 datapen is empty */
static void
gst_opt_scheduler_loop_wrapper (GstPad * sinkpad, GstData * data)
{
GstOptSchedulerGroup *group;
GstOptScheduler *osched;
GstRealPad *peer;
group = GST_ELEMENT_SCHED_GROUP (GST_PAD_PARENT (sinkpad));
osched = group->chain->sched;
peer = GST_RPAD_PEER (sinkpad);
GST_LOG ("chain handler for loop-based pad %" GST_PTR_FORMAT, sinkpad);
#ifdef USE_COTHREADS
if (GST_PAD_DATALIST (peer)) {
g_warning ("deadlock detected, disabling group %p", group);
group_error_handler (group);
} else {
GST_LOG ("queueing data %p on %s:%s's datapen", data,
GST_DEBUG_PAD_NAME (peer));
GST_PAD_DATAPEN (peer) = g_list_append (GST_PAD_DATALIST (peer), data);
schedule_group (group);
}
#else
GST_LOG ("queueing data %p on %s:%s's datapen", data,
GST_DEBUG_PAD_NAME (peer));
GST_PAD_DATAPEN (peer) = g_list_append (GST_PAD_DATALIST (peer), data);
if (!(group->flags & GST_OPT_SCHEDULER_GROUP_RUNNING)) {
GST_LOG ("adding group %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 ("%d datas left on %s:%s's datapen after chain handler",
g_list_length (GST_PAD_DATALIST (peer)), GST_DEBUG_PAD_NAME (peer));
}
/* this function is called by a loop based element that performs a
* pull on a sinkpad. We schedule the peer group until the datapen
* is filled with the data 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 handler for %" GST_PTR_FORMAT, srcpad);
/* first try to grab a queued data */
if (GST_PAD_DATALIST (srcpad)) {
data = GST_PAD_DATALIST (srcpad)->data;
GST_PAD_DATAPEN (srcpad) = g_list_remove (GST_PAD_DATALIST (srcpad), data);
GST_LOG ("returning popped queued data %p", data);
return data;
}
GST_LOG ("need to schedule the peer element");
/* else we need to schedule the peer element */
get_group (GST_PAD_PARENT (srcpad), &group);
if (group == NULL) {
/* wow, peer has no group */
GST_LOG ("peer without group detected");
//group_error_handler (group);
return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
osched = group->chain->sched;
data = NULL;
disabled = FALSE;
do {
GST_LOG ("scheduling upstream group %p to fill datapen", group);
#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 ("recursing into scheduler group %p", group);
gst_opt_scheduler_schedule_run_queue (osched);
GST_LOG ("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_DATALIST (srcpad)) {
data = GST_PAD_DATALIST (srcpad)->data;
GST_PAD_DATAPEN (srcpad) =
g_list_remove (GST_PAD_DATALIST (srcpad), data);
} else if (disabled) {
/* no data in queue and peer group was disabled */
data = GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
}
}
while (data == NULL);
GST_LOG ("get handler, returning data %p, queue length %d",
data, g_list_length (GST_PAD_DATALIST (srcpad)));
return data;
}
static void
pad_clear_queued (GstPad * srcpad, gpointer user_data)
{
GList *datalist = GST_PAD_DATALIST (srcpad);
if (datalist) {
GST_LOG ("need to clear some datas");
g_list_foreach (datalist, (GFunc) gst_data_unref, NULL);
g_list_free (datalist);
GST_PAD_DATAPEN (srcpad) = NULL;
}
}
static gboolean
gst_opt_scheduler_event_wrapper (GstPad * srcpad, GstEvent * event)
{
gboolean flush;
GST_DEBUG ("intercepting event type %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 triggers a flush");
pad_clear_queued (srcpad, NULL);
}
return GST_RPAD_EVENTFUNC (srcpad) (srcpad, event);
}
static GstElementStateReturn
gst_opt_scheduler_state_transition (GstScheduler * sched, GstElement * element,
gint transition)
{
GstOptSchedulerGroup *group;
GstElementStateReturn res = GST_STATE_SUCCESS;
GST_DEBUG ("element \"%s\" state change (%04x)", 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_LOG ("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_LOG ("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 without a group has to be an unlinked src, sink
* filter element */
if (!group) {
GST_INFO ("element \"%s\" has no group", GST_ELEMENT_NAME (element));
}
/* else construct the scheduling context of this group and enable it */
else {
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;
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.
* Group links must be managed by the caller.
*/
static GstOptSchedulerGroup *
group_elements (GstOptScheduler * osched, GstElement * element1,
GstElement * element2, GstOptSchedulerGroupType type)
{
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_DEBUG ("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, type);
add_to_group (group, element2, TRUE);
}
/* the first element has a group */
else if (group1) {
GST_DEBUG ("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, TRUE);
group = group1;
}
/* element1 has no group, element2 does. Add element1 to the
* group of element2 */
else {
GST_DEBUG ("adding \"%s\" to \"%s\"'s group",
GST_ELEMENT_NAME (element1), GST_ELEMENT_NAME (element2));
add_to_group (group2, element1, TRUE);
group = group2;
}
return group;
}
/*
* increment link counts between groups -- it's important that src is actually
* the src group, so we can introspect the topology later
*/
static void
group_inc_link (GstOptSchedulerGroup * src, GstOptSchedulerGroup * sink)
{
GSList *links = src->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, src, sink)) {
/* we found a link to this group, increment the link count */
link->count++;
GST_LOG ("incremented group link count between %p and %p to %d",
src, sink, link->count);
done = TRUE;
}
}
if (!done) {
/* no link was found, create a new one */
link = g_new0 (GstOptSchedulerGroupLink, 1);
link->src = src;
link->sink = sink;
link->count = 1;
src->group_links = g_slist_prepend (src->group_links, link);
sink->group_links = g_slist_prepend (sink->group_links, link);
src->sched->live_links++;
GST_DEBUG ("added group link between %p and %p, %d live links now",
src, sink, src->sched->live_links);
}
}
/*
* decrement link counts between groups, returns TRUE if the link count reaches
* 0 -- note that the groups are not necessarily ordered as (src, sink) like
* inc_link requires
*/
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)) {
g_assert (link->count > 0);
link->count--;
GST_LOG ("link count between %p and %p is now %d",
group1, group2, link->count);
if (link->count == 0) {
GstOptSchedulerGroup *iso_group = NULL;
group1->group_links = g_slist_remove (group1->group_links, link);
group2->group_links = g_slist_remove (group2->group_links, link);
group1->sched->live_links--;
GST_LOG ("%d live links now", group1->sched->live_links);
g_free (link);
GST_DEBUG ("removed group link between %p and %p", group1, group2);
if (group1->group_links == NULL) {
/* group1 has no more links with other groups */
iso_group = group1;
} else if (group2->group_links == NULL) {
/* group2 has no more links with other groups */
iso_group = group2;
}
if (iso_group) {
GstOptSchedulerChain *chain;
GST_DEBUG ("group %p has become isolated, moving to new chain",
iso_group);
chain = create_chain (iso_group->chain->sched);
remove_from_chain (iso_group->chain, iso_group);
add_to_chain (chain, iso_group);
}
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 (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 (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 (sched);
GstOptSchedulerCtx *ctx;
const GList *pads;
GST_DEBUG_OBJECT (sched, "adding element \"%s\"", GST_OBJECT_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 (element)->sched_private = 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, GST_OPT_SCHEDULER_GROUP_LOOP);
group->entry = element;
GST_LOG ("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_DEBUG_OBJECT (sched, "removing element \"%s\"",
GST_OBJECT_NAME (element));
/* decoupled elements are not added to the scheduler lists and should therefore
* not 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 (element)->sched_private);
GST_ELEMENT (element)->sched_private = NULL;
}
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_OBJECT_NAME (element));
#ifdef USE_COTHREADS
do_cothread_switch (do_cothread_get_main (((GstOptScheduler *) sched)->
context));
return FALSE;
#else
{
GstOptScheduler *osched = GST_OPT_SCHEDULER (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 (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 (sched);
LinkType type = GST_OPT_INVALID;
GstElement *src_element, *sink_element;
GST_INFO ("scheduling link between %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
src_element = GST_PAD_PARENT (srcpad);
sink_element = GST_PAD_PARENT (sinkpad);
/* first we need to figure out what type of link we're dealing
* with */
if (src_element->loopfunc && sink_element->loopfunc)
type = GST_OPT_LOOP_TO_LOOP;
else {
if (src_element->loopfunc) {
if (GST_RPAD_CHAINFUNC (sinkpad))
type = GST_OPT_LOOP_TO_CHAIN;
} else if (sink_element->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 (src_element) != NULL &&
GST_ELEMENT_SCHED_GROUP (src_element) != NULL) {
GstOptSchedulerGroup *group = GST_ELEMENT_SCHED_GROUP (src_element);
/* 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 != sink_element) {
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 (src_element) != NULL &&
GST_ELEMENT_SCHED_GROUP (src_element) != NULL) {
GstOptSchedulerGroup *group = GST_ELEMENT_SCHED_GROUP (src_element);
/* 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 != src_element) {
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_LOG ("get to chain based link");
/* setup get/chain handlers */
GST_RPAD_GETHANDLER (srcpad) = gst_pad_call_get_function;
GST_RPAD_CHAINHANDLER (sinkpad) = gst_pad_call_chain_function;
/* 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, src_element, sink_element,
GST_OPT_SCHEDULER_GROUP_GET);
/* if there is not yet an entry in the group, select the source
* element as the entry point and mark the group as a get based
* group */
if (!group->entry) {
group->entry = src_element;
group->type = GST_OPT_SCHEDULER_GROUP_GET;
GST_DEBUG ("setting \"%s\" as entry point of _get-based group %p",
GST_ELEMENT_NAME (src_element), group);
setup_group_scheduler (osched, group);
}
break;
}
case GST_OPT_LOOP_TO_CHAIN:
case GST_OPT_CHAIN_TO_CHAIN:
GST_LOG ("loop/chain to chain based link");
GST_RPAD_CHAINHANDLER (sinkpad) = gst_pad_call_chain_function;
/* 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
* src_element, there will be a group for src_element and sink_element
* will be added to it. In the case a new group is created, we can't know
* the type so we pass UNKNOWN as an arg */
group_elements (osched, src_element, sink_element,
GST_OPT_SCHEDULER_GROUP_UNKNOWN);
break;
case GST_OPT_GET_TO_LOOP:
GST_LOG ("get to loop based link");
GST_RPAD_GETHANDLER (srcpad) = gst_pad_call_get_function;
/* the two elements should be put into the same group, this also means
* that they are in the same chain automatically, sink_element is
* loop-based so it already has a group where src_element will be added
* to */
group_elements (osched, src_element, sink_element,
GST_OPT_SCHEDULER_GROUP_LOOP);
break;
case GST_OPT_CHAIN_TO_LOOP:
case GST_OPT_LOOP_TO_LOOP:
{
GstOptSchedulerGroup *group1, *group2;
GST_LOG ("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 (src_element);
group2 = GST_ELEMENT_SCHED_GROUP (sink_element);
g_assert (group2 != NULL);
/* group2 is guaranteed to exist as it contains a loop-based element.
* group1 only exists if src_element is linked to some other element */
if (!group1) {
/* create a new group for src_element as it cannot be merged into another group
* here. we create the group in the same chain as the loop-based element. note
* that creating a new group will also increment the links with other groups */
GST_DEBUG ("creating new group for element %s",
GST_ELEMENT_NAME (src_element));
group1 =
create_group (group2->chain, src_element,
GST_OPT_SCHEDULER_GROUP_LOOP);
} else {
/* both elements are already in a group, make sure they are added to
* the same chain */
merge_chains (group1->chain, group2->chain);
/* increment the group link counters */
group_inc_link (group1, group2);
}
break;
}
case GST_OPT_INVALID:
g_error ("(internal error) invalid element link, what are you doing?");
break;
}
}
static void
group_elements_set_visited (GstOptSchedulerGroup * group, gboolean visited)
{
GSList *elements;
for (elements = group->elements; elements; elements = g_slist_next (elements)) {
GstElement *element = GST_ELEMENT (elements->data);
if (visited) {
GST_ELEMENT_SET_VISITED (element);
} else {
GST_ELEMENT_UNSET_VISITED (element);
}
}
}
static GList *
element_get_reachables_func (GstElement * element, GstOptSchedulerGroup * group,
GstPad * brokenpad)
{
GList *result = NULL;
const GList *pads;
/* if no element or element not in group or been there, return NULL */
if (element == NULL || !group_has_element (group, element) ||
GST_ELEMENT_IS_VISITED (element))
return NULL;
GST_ELEMENT_SET_VISITED (element);
result = g_list_prepend (result, element);
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *pad = GST_PAD (pads->data);
GstPad *peer;
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;
peer = GST_PAD_PEER (pad);
if (!GST_IS_REAL_PAD (peer) || peer == brokenpad)
continue;
if (peer) {
GstElement *parent;
GList *res;
parent = GST_PAD_PARENT (peer);
res = element_get_reachables_func (parent, group, brokenpad);
result = g_list_concat (result, res);
}
}
return result;
}
static GList *
element_get_reachables (GstElement * element, GstOptSchedulerGroup * group,
GstPad * brokenpad)
{
GList *result;
/* reset visited flags */
group_elements_set_visited (group, FALSE);
result = element_get_reachables_func (element, group, brokenpad);
/* and reset visited flags again */
group_elements_set_visited (group, FALSE);
return result;
}
/*
* 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_LOG ("checking if group %p can reach %p", group, target);
/* seems like we found the target element */
if (group == target) {
GST_LOG ("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_LOG ("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_LOG ("found link from %p to %p, count %d", group, other, link->count);
/* check if we can reach the target recursively */
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_LOG ("leaving group %p with %s", group, (reachable ? "TRUE" : "FALSE"));
return reachable;
}
/*
* Go through all the pads of the given element and decrement the links that
* this group has with the group of the peer element. This function is mainly used
* to update the group connections before we remove the element from the group.
*/
static void
group_dec_links_for_element (GstOptSchedulerGroup * group, GstElement * element)
{
GList *l;
GstPad *pad;
GstOptSchedulerGroup *peer_group;
for (l = GST_ELEMENT_PADS (element); l; l = l->next) {
pad = (GstPad *) l->data;
if (GST_IS_REAL_PAD (pad) && GST_PAD_PEER (pad)) {
get_group (GST_PAD_PARENT (GST_PAD_PEER (pad)), &peer_group);
if (peer_group && peer_group != group)
group_dec_link (group, peer_group);
}
}
}
/*
* Go through all the pads of the given element and increment the links that
* this group has with the group of the peer element. This function is mainly used
* to update the group connections before we add the element to the group.
*/
static void
group_inc_links_for_element (GstOptSchedulerGroup * group, GstElement * element)
{
GList *l;
GstPad *pad;
GstOptSchedulerGroup *peer_group;
GST_DEBUG ("group %p, element %s ", group, gst_element_get_name (element));
for (l = GST_ELEMENT_PADS (element); l; l = l->next) {
pad = (GstPad *) l->data;
if (GST_IS_REAL_PAD (pad) && GST_PAD_PEER (pad)) {
get_group (GST_PAD_PARENT (GST_PAD_PEER (pad)), &peer_group);
if (peer_group && peer_group != group)
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC)
group_inc_link (group, peer_group);
else
group_inc_link (peer_group, group);
}
}
}
static void
debug_element (GstElement * element, GstOptScheduler * osched)
{
GST_LOG ("element %s", gst_element_get_name (element));
}
/* move this group in the chain of the groups it has links with */
static void
rechain_group (GstOptSchedulerGroup * group)
{
GstOptSchedulerChain *chain = NULL;
GSList *links;
GST_LOG ("checking if this group needs rechaining");
/* follow all links */
for (links = group->group_links; links; links = g_slist_next (links)) {
GstOptSchedulerGroupLink *link = (GstOptSchedulerGroupLink *) links->data;
GstOptSchedulerGroup *other;
other = OTHER_GROUP_LINK (link, group);
GST_LOG ("found link with other group %p with chain %p", other,
other->chain);
/* first time, take chain */
if (chain == NULL) {
chain = other->chain;
}
/* second time, chain should be the same */
else if (other->chain != chain) {
g_warning ("(internal error): chain inconsistency");
}
}
if (!chain) {
GST_LOG ("no new chain found, not rechaining");
} else if (chain != group->chain) {
GST_LOG ("need to move group %p to chain %p", group, chain);
/* remove from old chain */
remove_from_chain (group->chain, group);
/* and move to new chain */
add_to_chain (chain, group);
} else {
GST_LOG ("group %p is in correct chain %p", group, chain);
}
}
/* migrate the element and all connected elements to a new group without looking at
* the brokenpad */
static GstOptSchedulerGroup *
group_migrate_connected (GstOptScheduler * osched, GstElement * element,
GstOptSchedulerGroup * group, GstPad * brokenpad)
{
GList *connected, *c;
GstOptSchedulerGroup *new_group = NULL, *tst;
GstOptSchedulerChain *chain;
gint len;
if (GST_ELEMENT_IS_DECOUPLED (element)) {
GST_LOG ("element is decoupled and thus not in the group");
/* the element is decoupled and is therefore not in the group */
return NULL;
}
get_group (element, &tst);
if (tst == NULL) {
GST_LOG ("element has no group, not interesting");
return NULL;
}
GST_LOG ("migrate connected elements to new group");
connected = element_get_reachables (element, group, brokenpad);
GST_LOG ("elements to move to new group:");
g_list_foreach (connected, (GFunc) debug_element, NULL);
len = g_list_length (connected);
if (len == 0) {
g_warning ("(internal error) found lost element %s",
gst_element_get_name (element));
return NULL;
} else if (len == 1) {
group = remove_from_group (group, GST_ELEMENT (connected->data));
GST_LOG
("not migrating to new group as the group would only contain 1 element");
g_list_free (connected);
GST_LOG ("new group is old group now");
new_group = group;
} else {
/* we create a new chain to hold the new group */
chain = create_chain (osched);
for (c = connected; c; c = g_list_next (c)) {
GstElement *element = GST_ELEMENT (c->data);
group = remove_from_group (group, element);
if (new_group == NULL) {
new_group =
create_group (chain, element, GST_OPT_SCHEDULER_GROUP_UNKNOWN);
} else {
add_to_group (new_group, element, TRUE);
}
}
g_list_free (connected);
/* remove last element from the group if any. Make sure not to remove
* the loop based entry point of a group as this always needs one group */
if (group != NULL) {
if (group_num_elements (group) == 1 &&
group->type != GST_OPT_SCHEDULER_GROUP_LOOP) {
GST_LOG ("removing last element from old group");
group = remove_from_group (group, GST_ELEMENT (group->elements->data));
}
}
}
if (new_group != NULL) {
if (group_num_elements (new_group) == 1 &&
new_group->type != GST_OPT_SCHEDULER_GROUP_LOOP) {
GST_LOG ("removing last element from new group");
new_group =
remove_from_group (new_group,
GST_ELEMENT (new_group->elements->data));
return NULL;
}
/* at this point the new group lives in its own chain but might
* have to be merged with another chain, this happens when the new
* group has a link with another group in another chain */
rechain_group (new_group);
}
return new_group;
}
static void
gst_opt_scheduler_pad_unlink (GstScheduler * sched,
GstPad * srcpad, GstPad * sinkpad)
{
GstOptScheduler *osched = GST_OPT_SCHEDULER (sched);
GstElement *src_element, *sink_element;
GstOptSchedulerGroup *group1, *group2;
GST_INFO ("unscheduling link between %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
src_element = GST_PAD_PARENT (srcpad);
sink_element = GST_PAD_PARENT (sinkpad);
get_group (src_element, &group1);
get_group (sink_element, &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 (src_element)) {
group1 = group2;
}
if (GST_ELEMENT_IS_DECOUPLED (sink_element)) {
group2 = group1;
}
/* if one the elements has no group (anymore) we don't really care
* about the link */
if (!group1 || !group2) {
GST_LOG
("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_LOG ("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_DEBUG ("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_DEBUG ("migrated group %p to new chain %p", group1, chain);
}
} else {
GST_DEBUG ("group %p still has direct link with group %p", group1,
group2);
}
}
/* hard part, groups are equal */
else {
GstOptSchedulerGroup *group;
/* since group1 == group2, it doesn't matter which group we take */
group = group1;
GST_LOG ("elements are in the same group %p", group);
if (group->entry == NULL) {
/* it doesn't really matter, we just have to make sure that both
* elements end up in another group if they are not connected */
GST_LOG ("group %p has no entry, moving source element to new group",
group);
group_migrate_connected (osched, src_element, group, srcpad);
} else {
GList *reachables;
GST_LOG ("group %p has entry %p", group, group->entry);
/* get of a list of all elements that are still managed by the old
* entry element */
reachables = element_get_reachables (group->entry, group, srcpad);
GST_LOG ("elements still reachable from the entry:");
g_list_foreach (reachables, (GFunc) debug_element, sched);
/* if the source is reachable from the entry, we can leave it in the group */
if (g_list_find (reachables, src_element)) {
GST_LOG
("source element still reachable from the entry, leaving in group");
} else {
GST_LOG
("source element not reachable from the entry, moving to new group");
group_migrate_connected (osched, src_element, group, srcpad);
}
/* if the sink is reachable from the entry, we can leave it in the group */
if (g_list_find (reachables, sink_element)) {
GST_LOG
("sink element still reachable from the entry, leaving in group");
} else {
GST_LOG
("sink element not reachable from the entry, moving to new group");
group_migrate_connected (osched, sink_element, group, srcpad);
}
g_list_free (reachables);
}
/* at this point the group can be freed and gone, so don't touch */
}
}
/* 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 (sched);
gint iterations = osched->iterations;
osched->state = GST_OPT_SCHEDULER_STATE_RUNNING;
GST_DEBUG_OBJECT (sched, "iterating");
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)) {
GST_LOG ("scheduling chain %p", chain);
schedule_chain (chain);
scheduled = TRUE;
GST_LOG ("scheduled chain %p", chain);
} else {
GST_LOG ("not scheduling disabled chain %p", chain);
}
/* 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;
}
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 (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;
GSList *group_links = group->group_links;
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));
}
while (group_links) {
GstOptSchedulerGroupLink *link =
(GstOptSchedulerGroupLink *) group_links->data;
group_links = g_slist_next (group_links);
g_print ("group link %p between %p and %p, count %d\n",
link, link->src, link->sink, link->count);
}
}
}
}
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 (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 (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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