gstreamer/gst/schedulers/entryscheduler.c

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/* GStreamer
* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
*
* gstentryscheduler.c: A scheduler based on entries
*
* 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>
#include "cothreads_compat.h"
#include "../gst-i18n-lib.h"
GST_DEBUG_CATEGORY_STATIC (debug_scheduler);
#define GST_CAT_DEFAULT debug_scheduler
#define GET_TYPE(x) gst_entry_ ## x ## _scheduler_get_type
#define GST_TYPE_ENTRY_SCHEDULER \
(GET_TYPE (COTHREADS_TYPE) ())
#define GST_ENTRY_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ENTRY_SCHEDULER,GstEntryScheduler))
#define GST_ENTRY_SCHEDULER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ENTRY_SCHEDULER,GstEntrySchedulerClass))
#define GST_IS_ENTRY_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ENTRY_SCHEDULER))
#define GST_IS_ENTRY_SCHEDULER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ENTRY_SCHEDULER))
#define SCHED_ASSERT(sched, assertion) G_STMT_START{ \
if (!(assertion)) \
gst_scheduler_show (GST_SCHEDULER (sched)); \
g_assert (assertion); \
}G_STMT_END
typedef enum
{
WAIT_FOR_NOTHING,
WAIT_FOR_MUM,
WAIT_FOR_PADS, /* pad must be scheduled */
/* add more */
WAIT_FOR_ANYTHING
}
WaitInfo;
typedef enum
{
ENTRY_UNDEFINED,
ENTRY_COTHREAD,
ENTRY_LINK
}
EntryType;
typedef struct
{
EntryType type;
}
Entry;
#define ENTRY_IS_COTHREAD(x) (((Entry *)(x))->type == ENTRY_COTHREAD)
#define ENTRY_IS_LINK(x) (((Entry *)(x))->type == ENTRY_LINK)
typedef struct _GstEntryScheduler GstEntryScheduler;
typedef struct _GstEntrySchedulerClass GstEntrySchedulerClass;
typedef struct
{
Entry entry;
/* pointer to scheduler */
GstEntryScheduler *sched;
/* pointer to element */
GstElement *element;
/* the main function of the cothread */
int (*main) (int argc, gchar ** argv);
/* wether the given pad is schedulable */
gboolean (*can_schedule) (GstRealPad * pad);
/* what the element is currently waiting for */
WaitInfo wait;
/* cothread of element */
cothread *thread;
/* pad to schedule next */
GstRealPad *schedule_pad;
}
CothreadPrivate;
#define ELEMENT_PRIVATE(element) ((CothreadPrivate *) GST_ELEMENT (element)->sched_private)
#define SCHED(element) (GST_ENTRY_SCHEDULER ((element)->sched))
typedef struct
{
Entry entry;
/* pads */
GstRealPad *srcpad;
GstRealPad *sinkpad;
/* private struct of srcpad's element, needed for decoupled elements */
CothreadPrivate *src;
/* private struct of sinkpad's element */
CothreadPrivate *sink;
/* current data */
GstData *bufpen;
}
LinkPrivate;
#define PAD_PRIVATE(pad) ((LinkPrivate *) (GST_REAL_PAD (pad))->sched_private)
struct _GstEntryScheduler
{
GstScheduler scheduler;
cothread_context *context;
GList *schedule_now; /* entry points that must be scheduled this
iteration */
GList *schedule_possible; /* possible entry points */
GList *waiting; /* elements waiting for the clock */
gboolean error; /* if an element threw an error */
GSList *reaping; /* cothreads we need to destroy but can't */
};
struct _GstEntrySchedulerClass
{
GstSchedulerClass scheduler_class;
};
static void gst_entry_scheduler_class_init (gpointer g_class, gpointer data);
static void gst_entry_scheduler_init (GstEntryScheduler * object);
GType GET_TYPE (COTHREADS_TYPE) (void)
{
static GType object_type = 0;
if (object_type == 0) {
static const GTypeInfo object_info = {
sizeof (GstEntrySchedulerClass),
NULL,
NULL,
gst_entry_scheduler_class_init,
NULL,
NULL,
sizeof (GstEntryScheduler),
0,
(GInstanceInitFunc) gst_entry_scheduler_init
};
object_type =
g_type_register_static (GST_TYPE_SCHEDULER,
"GstEntry" COTHREADS_NAME_CAPITAL "Scheduler", &object_info, 0);
}
return object_type;
}
static int gst_entry_scheduler_loop_wrapper (int argc, char **argv);
static int gst_entry_scheduler_get_wrapper (int argc, char **argv);
static int gst_entry_scheduler_chain_wrapper (int argc, char **argv);
static void gst_entry_scheduler_setup (GstScheduler * sched);
static void gst_entry_scheduler_reset (GstScheduler * sched);
static void gst_entry_scheduler_add_element (GstScheduler * sched,
GstElement * element);
static void gst_entry_scheduler_remove_element (GstScheduler * sched,
GstElement * element);
static GstElementStateReturn gst_entry_scheduler_state_transition (GstScheduler
* sched, GstElement * element, gint transition);
static gboolean gst_entry_scheduler_yield (GstScheduler * sched,
GstElement * element);
static gboolean gst_entry_scheduler_interrupt (GstScheduler * sched,
GstElement * element);
static void gst_entry_scheduler_error (GstScheduler * sched,
GstElement * element);
static void gst_entry_scheduler_pad_link (GstScheduler * sched, GstPad * srcpad,
GstPad * sinkpad);
static void gst_entry_scheduler_pad_unlink (GstScheduler * sched,
GstPad * srcpad, GstPad * sinkpad);
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static GstData *gst_entry_scheduler_pad_select (GstScheduler * sched,
GstPad ** pulled_from, GstPad ** pads);
static GstSchedulerState gst_entry_scheduler_iterate (GstScheduler * sched);
static void gst_entry_scheduler_show (GstScheduler * scheduler);
static gboolean can_schedule_pad (GstRealPad * pad);
static void schedule_next_element (GstEntryScheduler * sched);
static void
gst_entry_scheduler_class_init (gpointer klass, gpointer class_data)
{
GstSchedulerClass *scheduler = GST_SCHEDULER_CLASS (klass);
scheduler->setup = gst_entry_scheduler_setup;
scheduler->reset = gst_entry_scheduler_reset;
scheduler->add_element = gst_entry_scheduler_add_element;
scheduler->remove_element = gst_entry_scheduler_remove_element;
scheduler->state_transition = gst_entry_scheduler_state_transition;
scheduler->yield = gst_entry_scheduler_yield;
scheduler->interrupt = gst_entry_scheduler_interrupt;
scheduler->error = gst_entry_scheduler_error;
scheduler->pad_link = gst_entry_scheduler_pad_link;
scheduler->pad_unlink = gst_entry_scheduler_pad_unlink;
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scheduler->pad_select = gst_entry_scheduler_pad_select;
scheduler->clock_wait = NULL;
scheduler->iterate = gst_entry_scheduler_iterate;
scheduler->show = gst_entry_scheduler_show;
do_cothreads_init (NULL);
}
static void
gst_entry_scheduler_init (GstEntryScheduler * scheduler)
{
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GST_FLAG_SET (scheduler, GST_SCHEDULER_FLAG_NEW_API);
}
/*
* We've got to setup 5 different element types here:
* - loopbased
* - chainbased
* - chainbased PADS of decoupled elements
* - getbased
* - getbased PADS of decoupled elements
*/
/*
* LOOPBASED
*/
typedef struct
{
CothreadPrivate element;
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GstPad **sinkpads;
}
LoopPrivate;
#define LOOP_PRIVATE(x) ((LoopPrivate *) ELEMENT_PRIVATE (x))
static gboolean
_can_schedule_loop (GstRealPad * pad)
{
LoopPrivate *priv;
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gint i = 0;
g_assert (PAD_PRIVATE (pad));
if (GST_PAD_IS_SRC (pad))
return FALSE;
priv = LOOP_PRIVATE (gst_pad_get_parent (GST_PAD (pad)));
g_assert (priv);
if (!priv->sinkpads)
return FALSE;
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while (priv->sinkpads[i]) {
if (pad == GST_REAL_PAD (priv->sinkpads[i++]))
return TRUE;
}
return FALSE;
}
static int
gst_entry_scheduler_loop_wrapper (int argc, char **argv)
{
CothreadPrivate *priv = (CothreadPrivate *) argv;
GstElement *element = priv->element;
priv->wait = WAIT_FOR_NOTHING;
do {
g_assert (priv->wait == WAIT_FOR_NOTHING);
GST_LOG_OBJECT (SCHED (element), "calling loopfunc for element %s",
GST_ELEMENT_NAME (element));
if (element->loopfunc) {
element->loopfunc (element);
} else {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER, (_("badly behaving plugin")),
("loop-based element %s removed loopfunc during processing",
GST_OBJECT_NAME (element)));
}
GST_LOG_OBJECT (SCHED (element), "done calling loopfunc for element %s",
GST_OBJECT_NAME (element));
priv->wait = WAIT_FOR_NOTHING;
schedule_next_element (SCHED (element));
} while (TRUE);
return 0;
}
static CothreadPrivate *
setup_loop (GstEntryScheduler * sched, GstElement * element)
{
/* the types not matching is intentional, that's why it's g_new0 */
CothreadPrivate *priv = (CothreadPrivate *) g_new0 (LoopPrivate, 1);
priv->element = element;
priv->main = gst_entry_scheduler_loop_wrapper;
priv->wait = WAIT_FOR_NOTHING;
priv->can_schedule = _can_schedule_loop;
return priv;
}
/*
* CHAINBASED
*/
static GstData *
get_buffer (GstEntryScheduler * sched, GstRealPad * pad)
{
LinkPrivate *priv = PAD_PRIVATE (pad);
GstData *data = priv->bufpen;
priv->bufpen = NULL;
g_assert (data);
return data;
}
static int
gst_entry_scheduler_chain_wrapper (int argc, char **argv)
{
CothreadPrivate *priv = (CothreadPrivate *) argv;
GstElement *element = priv->element;
priv->wait = WAIT_FOR_PADS;
do {
GstRealPad *pad = priv->schedule_pad;
g_assert (priv->wait == WAIT_FOR_PADS);
g_assert (pad);
g_assert (GST_PAD_IS_SINK (pad));
g_assert (PAD_PRIVATE (pad)->bufpen != NULL);
GST_LOG_OBJECT (priv->sched, "calling chainfunc for pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
if (pad->chainfunc) {
GstData *data = get_buffer (priv->sched, pad);
gst_pad_call_chain_function (GST_PAD (pad), data);
/* don't do anything after here with the pad, it might already be dead!
the element is still alive though */
} else {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER, (_("badly behaving plugin")),
("chain-based element %s removed chainfunc of pad during processing",
GST_OBJECT_NAME (element)));
gst_data_unref (PAD_PRIVATE (pad)->bufpen);
PAD_PRIVATE (pad)->bufpen = NULL;
}
GST_LOG_OBJECT (priv->sched, "done calling chainfunc for element %s",
GST_OBJECT_NAME (element));
priv->wait = WAIT_FOR_PADS;
schedule_next_element (priv->sched);
} while (TRUE);
return 0;
}
static gboolean
_can_schedule_chain (GstRealPad * pad)
{
g_assert (PAD_PRIVATE (pad));
if (GST_PAD_IS_SRC (pad))
return FALSE;
g_assert (PAD_PRIVATE (pad));
return PAD_PRIVATE (pad)->sink->wait == WAIT_FOR_PADS;
}
static CothreadPrivate *
setup_chain (GstEntryScheduler * sched, GstElement * element)
{
CothreadPrivate *priv = g_new0 (CothreadPrivate, 1);
priv->main = gst_entry_scheduler_chain_wrapper;
priv->wait = WAIT_FOR_PADS;
priv->can_schedule = _can_schedule_chain;
return priv;
}
/*
* GETBASED
*/
static int
gst_entry_scheduler_get_wrapper (int argc, char **argv)
{
CothreadPrivate *priv = (CothreadPrivate *) argv;
GstElement *element = priv->element;
priv->wait = WAIT_FOR_PADS;
do {
GstRealPad *pad = priv->schedule_pad;
g_assert (pad);
g_assert (GST_PAD_IS_SRC (pad));
g_assert (PAD_PRIVATE (pad)->bufpen == NULL);
GST_LOG_OBJECT (priv->sched, "calling getfunc for pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
if (pad->getfunc) {
GstData *data = gst_pad_call_get_function (GST_PAD (pad));
/* make sure the pad still exists and is linked */
if (!g_list_find (element->pads, pad)) {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER,
(_("badly behaving plugin")),
("get-based element %s removed pad during getfunc",
GST_OBJECT_NAME (element)));
gst_data_unref (data);
} else if (!GST_PAD_PEER (pad)) {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER,
(_("badly behaving plugin")),
("get-based element %s unlinked pad during getfunc",
GST_OBJECT_NAME (element)));
gst_data_unref (data);
} else {
PAD_PRIVATE (pad)->bufpen = data;
priv->sched->schedule_now =
g_list_prepend (priv->sched->schedule_now, PAD_PRIVATE (pad));
}
} else {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER, (_("badly behaving plugin")),
("get-based element %s removed getfunc during processing",
GST_OBJECT_NAME (element)));
}
GST_LOG_OBJECT (priv->sched, "done calling getfunc for element %s",
GST_ELEMENT_NAME (element));
priv->wait = WAIT_FOR_PADS;
schedule_next_element (priv->sched);
} while (TRUE);
return 0;
}
static gboolean
_can_schedule_get (GstRealPad * pad)
{
g_assert (PAD_PRIVATE (pad));
g_assert (GST_PAD_IS_SRC (pad));
g_assert (PAD_PRIVATE (pad));
return PAD_PRIVATE (pad)->bufpen == NULL &&
PAD_PRIVATE (pad)->src->wait == WAIT_FOR_PADS &&
can_schedule_pad (PAD_PRIVATE (pad)->sinkpad);
}
static CothreadPrivate *
setup_get (GstEntryScheduler * sched, GstElement * element)
{
CothreadPrivate *priv = g_new0 (CothreadPrivate, 1);
priv->main = gst_entry_scheduler_get_wrapper;
priv->wait = WAIT_FOR_PADS;
priv->can_schedule = _can_schedule_get;
return priv;
}
/*
* scheduling functions
*/
static gboolean
can_schedule_pad (GstRealPad * pad)
{
LinkPrivate *link = PAD_PRIVATE (pad);
g_assert (link);
if (GST_STATE (gst_pad_get_parent (GST_PAD (pad))) != GST_STATE_PLAYING)
return FALSE;
if (GST_PAD_IS_SINK (pad)) {
return link->sink->can_schedule (pad);
} else {
return link->src->can_schedule (pad);
}
}
static gboolean
can_schedule (Entry * entry)
{
if (ENTRY_IS_LINK (entry)) {
LinkPrivate *link = (LinkPrivate *) entry;
CothreadPrivate *priv;
GstRealPad *pad;
if (link->bufpen) {
priv = link->sink;
pad = link->sinkpad;
} else {
priv = link->src;
pad = link->srcpad;
}
if (priv->wait != WAIT_FOR_PADS)
return FALSE;
return can_schedule_pad (pad);
} else if (ENTRY_IS_COTHREAD (entry)) {
CothreadPrivate *priv = (CothreadPrivate *) entry;
GList *list;
if (priv->wait != WAIT_FOR_NOTHING)
return FALSE;
if (GST_STATE (priv->element) != GST_STATE_PLAYING)
return FALSE;
if (GST_FLAG_IS_SET (priv->element, GST_ELEMENT_DECOUPLED)) {
g_assert (PAD_PRIVATE (priv->schedule_pad));
return TRUE;
}
for (list = priv->element->pads; list; list = g_list_next (list)) {
GstPad *pad = GST_PAD (list->data);
if (GST_PAD_IS_SRC (pad) && PAD_PRIVATE (pad) &&
PAD_PRIVATE (pad)->bufpen != NULL)
return FALSE;
}
return TRUE;
} else {
g_assert_not_reached ();
return FALSE;
}
}
static void
safe_cothread_switch (GstEntryScheduler * scheduler, cothread * thread)
{
GList *list;
cothread *cur = do_cothread_get_current (scheduler->context);
if (cur == thread) {
GST_LOG_OBJECT (scheduler, "switch to same cothread, ignoring");
}
for (list = scheduler->schedule_possible; list; list = g_list_next (list)) {
if (ENTRY_IS_COTHREAD (list->data)) {
CothreadPrivate *priv = (CothreadPrivate *) list->data;
if (priv->thread == thread)
gst_object_ref (GST_OBJECT (priv->element));
if (priv->thread == cur)
gst_object_unref (GST_OBJECT (priv->element));
}
}
do_cothread_switch (thread);
if (cur == do_cothread_get_main (scheduler->context)) {
GSList *walk;
for (walk = scheduler->reaping; walk; walk = g_slist_next (walk)) {
do_cothread_destroy (walk->data);
}
g_slist_free (scheduler->reaping);
scheduler->reaping = NULL;
}
}
/* the meat - no guarantee as to which cothread this function is called */
static void
schedule (GstEntryScheduler * sched, Entry * entry)
{
CothreadPrivate *schedule_me;
g_assert (can_schedule (entry));
sched->schedule_now = g_list_remove (sched->schedule_now, entry);
sched->schedule_possible = g_list_remove (sched->schedule_possible, entry);
sched->schedule_possible = g_list_append (sched->schedule_possible, entry);
if (ENTRY_IS_LINK (entry)) {
LinkPrivate *link = (LinkPrivate *) entry;
if (link->bufpen) {
schedule_me = link->sink;
schedule_me->schedule_pad = link->sinkpad;
} else {
schedule_me = link->src;
schedule_me->schedule_pad = link->srcpad;
}
GST_DEBUG_OBJECT (sched, "scheduling pad %s:%s",
GST_DEBUG_PAD_NAME (schedule_me->schedule_pad));
} else if (ENTRY_IS_COTHREAD (entry)) {
schedule_me = (CothreadPrivate *) entry;
GST_DEBUG_OBJECT (sched, "scheduling element %s",
GST_OBJECT_NAME (schedule_me->element));
} else {
g_assert_not_reached ();
GST_DEBUG_OBJECT (sched, "scheduling main after error");
sched->error = TRUE;
safe_cothread_switch (sched, do_cothread_get_main (sched->context));
return;
}
if (!schedule_me->thread) {
GST_LOG_OBJECT (sched, "creating cothread for %p (element %s)", schedule_me,
GST_OBJECT_NAME (schedule_me->element));
do_cothread_create (schedule_me->thread, sched->context, schedule_me->main,
0, (gchar **) schedule_me);
}
safe_cothread_switch (sched, schedule_me->thread);
}
/* this function will die a horrible death if you have cyclic pipelines */
static Entry *
schedule_forward (Entry * entry)
{
if (can_schedule (entry))
return entry;
if (ENTRY_IS_LINK (entry)) {
return schedule_forward ((Entry *) ((LinkPrivate *) entry)->sink);
} else if (ENTRY_IS_COTHREAD (entry)) {
GList *list;
GstElement *element = ((CothreadPrivate *) entry)->element;
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED))
return NULL;
for (list = element->pads; list; list = g_list_next (list)) {
if (GST_PAD_IS_SINK (list->data) || !PAD_PRIVATE (list->data))
continue;
entry = schedule_forward ((Entry *) PAD_PRIVATE (list->data));
if (entry)
return entry;
}
} else {
g_assert_not_reached ();
}
return NULL;
}
static void
schedule_next_element (GstEntryScheduler * scheduler)
{
if (scheduler->error) {
GST_DEBUG_OBJECT (scheduler, "scheduling main after error");
safe_cothread_switch (scheduler, do_cothread_get_main (scheduler->context));
} else if (scheduler->waiting) {
/* FIXME: write me */
g_assert_not_reached ();
} else if (scheduler->schedule_now) {
GList *test;
for (test = scheduler->schedule_now; test; test = g_list_next (test)) {
Entry *entry = schedule_forward ((Entry *) test->data);
if (entry) {
schedule (scheduler, entry);
return;
}
}
if (!scheduler->waiting) {
GST_ERROR_OBJECT (scheduler,
"have stuff that must be scheduled, but nothing that can be scheduled");
scheduler->error = TRUE;
}
}
GST_DEBUG_OBJECT (scheduler, "scheduling main");
safe_cothread_switch (scheduler, do_cothread_get_main (scheduler->context));
}
/*
* handlers to attach to pads
*/
static void
gst_entry_scheduler_chain_handler (GstPad * pad, GstData * data)
{
LinkPrivate *priv = PAD_PRIVATE (pad);
CothreadPrivate *thread = priv->src;
GstEntryScheduler *sched = thread->sched;
GST_LOG_OBJECT (sched, "putting data %p in pen of pad %s:%s",
data, GST_DEBUG_PAD_NAME (pad));
if (priv->bufpen != NULL) {
GST_ERROR_OBJECT (sched, "scheduling error: trying to push data in bufpen"
"of pad %s:%s, but bufpen was full", GST_DEBUG_PAD_NAME (pad));
sched->error = TRUE;
gst_data_unref (data);
} else {
priv->bufpen = data;
sched->schedule_now = g_list_append (sched->schedule_now, priv);
}
thread->wait = WAIT_FOR_NOTHING;
schedule_next_element (sched);
GST_LOG_OBJECT (sched, "done");
}
static GstData *
gst_entry_scheduler_get_handler (GstPad * pad)
{
GstData *data;
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (gst_pad_get_scheduler (pad));
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GstPad *pads[2] = { NULL, NULL };
GstPad *ret;
pad = GST_PAD_PEER (pad);
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pads[0] = pad;
GST_LOG_OBJECT (sched, "pad %s:%s pulls", GST_DEBUG_PAD_NAME (pad));
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data = gst_entry_scheduler_pad_select (GST_SCHEDULER (sched), &ret, pads);
g_assert (pad == ret);
GST_LOG_OBJECT (sched, "done with %s:%s", GST_DEBUG_PAD_NAME (pad));
return data;
}
static gboolean
gst_entry_scheduler_event_handler (GstPad * srcpad, GstEvent * event)
{
/* FIXME: need to do more here? */
return GST_RPAD_EVENTFUNC (srcpad) (srcpad, event);
}
/*
* Entry points for this scheduler.
*/
static GstData *
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gst_entry_scheduler_pad_select (GstScheduler * scheduler, GstPad ** pulled_from,
GstPad ** pads)
{
GstData *data;
GstRealPad *pad = NULL;
GstElement *element = NULL;
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
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gint i = 0;
/* sanity check */
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while (pads[i]) {
pad = GST_REAL_PAD (pads[i++]);
if (PAD_PRIVATE (pad)->bufpen) {
sched->schedule_now =
g_list_remove (sched->schedule_now, PAD_PRIVATE (pad));
goto found;
}
}
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element = gst_pad_get_parent (GST_PAD (pad));
g_assert (element);
g_assert (ELEMENT_PRIVATE (element)->main ==
gst_entry_scheduler_loop_wrapper);
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LOOP_PRIVATE (element)->sinkpads = pads;
ELEMENT_PRIVATE (element)->wait = WAIT_FOR_PADS;
schedule_next_element (SCHED (element));
LOOP_PRIVATE (element)->sinkpads = NULL;
pad = ELEMENT_PRIVATE (element)->schedule_pad;
g_assert (PAD_PRIVATE (pad)->bufpen);
found:
data = get_buffer (sched, pad);
g_return_val_if_fail (pulled_from, data);
*pulled_from = GST_PAD (pad);
return data;
}
static void
gst_entry_scheduler_setup (GstScheduler * sched)
{
/* first create thread context */
if (GST_ENTRY_SCHEDULER (sched)->context == NULL) {
GST_DEBUG_OBJECT (sched, "initializing cothread context");
GST_ENTRY_SCHEDULER (sched)->context = do_cothread_context_init ();
}
}
static void
safe_cothread_destroy (CothreadPrivate * thread)
{
GstEntryScheduler *scheduler = thread->sched;
if (do_cothread_get_current (scheduler->context) ==
do_cothread_get_main (scheduler->context)) {
do_cothread_destroy (thread->thread);
} else {
GST_WARNING_OBJECT (scheduler, "delaying destruction of cothread %p",
thread->thread);
scheduler->reaping = g_slist_prepend (scheduler->reaping, thread->thread);
}
thread->thread = NULL;
}
static void
gst_entry_scheduler_remove_all_cothreads (GstEntryScheduler * scheduler)
{
GList *list;
for (list = scheduler->schedule_possible; list; list = g_list_next (list)) {
if (ENTRY_IS_COTHREAD (list->data)) {
CothreadPrivate *priv = (CothreadPrivate *) list->data;
if (priv->thread)
safe_cothread_destroy (priv);
}
}
}
static void
gst_entry_scheduler_reset (GstScheduler * sched)
{
GstEntryScheduler *scheduler = GST_ENTRY_SCHEDULER (sched);
if (scheduler->context) {
g_return_if_fail (scheduler->reaping == NULL);
gst_entry_scheduler_remove_all_cothreads (scheduler);
do_cothread_context_destroy (scheduler->context);
scheduler->context = NULL;
}
}
static CothreadPrivate *
_setup_cothread (GstEntryScheduler * sched, GstElement * element,
CothreadPrivate * (*setup_func) (GstEntryScheduler *, GstElement *))
{
CothreadPrivate *priv = setup_func (sched, element);
priv->entry.type = ENTRY_COTHREAD;
priv->sched = sched;
priv->element = element;
sched->schedule_possible = g_list_prepend (sched->schedule_possible, priv);
if (GST_STATE (element) >= GST_STATE_READY)
gst_entry_scheduler_state_transition (GST_SCHEDULER (sched), element,
GST_STATE_NULL_TO_READY);
if (GST_STATE (element) >= GST_STATE_PAUSED)
gst_entry_scheduler_state_transition (GST_SCHEDULER (sched), element,
GST_STATE_READY_TO_PAUSED);
if (GST_STATE (element) >= GST_STATE_PLAYING)
gst_entry_scheduler_state_transition (GST_SCHEDULER (sched), element,
GST_STATE_PAUSED_TO_PLAYING);
return priv;
}
static void
gst_entry_scheduler_add_element (GstScheduler * scheduler, GstElement * element)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
GST_INFO_OBJECT (sched, "decoupled element %s added, ignoring",
GST_OBJECT_NAME (element));
return;
}
g_assert (element->sched_private == NULL);
if (element->loopfunc) {
element->sched_private = _setup_cothread (sched, element, setup_loop);
}
}
static void
_remove_cothread (CothreadPrivate * priv)
{
GstEntryScheduler *sched = priv->sched;
sched->waiting = g_list_remove (sched->waiting, priv);
sched->schedule_now = g_list_remove (sched->schedule_now, priv);
sched->schedule_possible = g_list_remove (sched->schedule_possible, priv);
if (priv->thread)
safe_cothread_destroy (priv);
g_free (priv);
}
static void
gst_entry_scheduler_remove_element (GstScheduler * scheduler,
GstElement * element)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
GST_INFO_OBJECT (sched, "decoupled element %s added, ignoring",
GST_OBJECT_NAME (element));
return;
}
if (element->sched_private) {
_remove_cothread (element->sched_private);
element->sched_private = NULL;
}
}
static GstElementStateReturn
gst_entry_scheduler_state_transition (GstScheduler * scheduler,
GstElement * element, gint transition)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED))
return GST_STATE_SUCCESS;
/* check if our parent changed state */
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
if (element == scheduler->parent) {
gst_entry_scheduler_remove_all_cothreads (sched);
}
if (element->sched_private != NULL
&& ELEMENT_PRIVATE (element)->thread != NULL) {
safe_cothread_destroy (ELEMENT_PRIVATE (element));
}
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_warning ("invalid state change %d for element %s", transition,
GST_OBJECT_NAME (element));
return GST_STATE_FAILURE;
}
return GST_STATE_SUCCESS;
}
static gboolean
gst_entry_scheduler_yield (GstScheduler * sched, GstElement * element)
{
/* g_assert (ELEMENT_PRIVATE (element)); */
/* FIXME: queue thinks it may just interrupt, is that ok? */
if (!ELEMENT_PRIVATE (element))
return TRUE;
ELEMENT_PRIVATE (element)->wait = WAIT_FOR_NOTHING;
schedule_next_element (GST_ENTRY_SCHEDULER (sched));
return FALSE;
}
static gboolean
gst_entry_scheduler_interrupt (GstScheduler * sched, GstElement * element)
{
/* FIXME? */
return gst_entry_scheduler_yield (sched, element);
}
static void
gst_entry_scheduler_error (GstScheduler * scheduler, GstElement * element)
{
GST_ENTRY_SCHEDULER (scheduler)->error = TRUE;
}
static void
gst_entry_scheduler_pad_link (GstScheduler * scheduler, GstPad * srcpad,
GstPad * sinkpad)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
LinkPrivate *priv;
GstElement *element;
priv = g_new0 (LinkPrivate, 1);
priv->entry.type = ENTRY_LINK;
/* wrap srcpad */
element = gst_pad_get_parent (srcpad);
priv->srcpad = GST_REAL_PAD (srcpad);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
priv->src = _setup_cothread (sched, element, setup_get);
} else {
priv->src = ELEMENT_PRIVATE (element);
if (!priv->src) {
GList *list;
for (list = element->pads; list; list = g_list_next (list)) {
if (GST_PAD_IS_SINK (list->data)) {
priv->src = _setup_cothread (sched, element, setup_chain);
break;
}
}
if (!priv->src)
priv->src = _setup_cothread (sched, element, setup_get);
element->sched_private = priv->src;
}
}
GST_RPAD_GETHANDLER (srcpad) = gst_entry_scheduler_get_handler;
GST_RPAD_EVENTHANDLER (srcpad) = gst_entry_scheduler_event_handler;
GST_REAL_PAD (srcpad)->sched_private = priv;
/* wrap sinkpad */
element = gst_pad_get_parent (sinkpad);
priv->sinkpad = GST_REAL_PAD (sinkpad);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED)) {
priv->sink = _setup_cothread (sched, element, setup_chain);
} else {
priv->sink = ELEMENT_PRIVATE (element);
if (priv->sink) {
/* LOOP or CHAIN */
g_assert (priv->sink->main != gst_entry_scheduler_get_wrapper);
} else {
priv->sink = _setup_cothread (sched, element, setup_chain);
element->sched_private = priv->sink;
}
}
GST_RPAD_CHAINHANDLER (sinkpad) = gst_entry_scheduler_chain_handler;
GST_RPAD_EVENTHANDLER (sinkpad) = gst_entry_scheduler_event_handler;
GST_REAL_PAD (sinkpad)->sched_private = priv;
sched->schedule_possible = g_list_prepend (sched->schedule_possible, priv);
}
static void
gst_entry_scheduler_pad_unlink (GstScheduler * scheduler, GstPad * srcpad,
GstPad * sinkpad)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
LinkPrivate *priv;
GstElement *element;
priv = PAD_PRIVATE (srcpad);
/* wrap srcpad */
element = gst_pad_get_parent (srcpad);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED))
_remove_cothread (priv->src);
GST_RPAD_GETHANDLER (srcpad) = NULL;
GST_RPAD_EVENTHANDLER (srcpad) = NULL;
GST_REAL_PAD (srcpad)->sched_private = NULL;
/* wrap sinkpad */
element = gst_pad_get_parent (sinkpad);
if (GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED))
_remove_cothread (priv->sink);
GST_RPAD_CHAINHANDLER (sinkpad) = NULL;
GST_RPAD_EVENTHANDLER (sinkpad) = NULL;
GST_REAL_PAD (sinkpad)->sched_private = NULL;
if (priv->bufpen) {
GST_WARNING_OBJECT (sched,
"found data in bufpen while unlinking %s:%s and %s:%s, discarding",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
gst_data_unref (priv->bufpen);
}
sched->schedule_now = g_list_remove (sched->schedule_now, priv);
sched->schedule_possible = g_list_remove (sched->schedule_possible, priv);
g_free (priv);
}
static GstSchedulerState
gst_entry_scheduler_iterate (GstScheduler * scheduler)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
GList *entries = sched->schedule_possible;
GstSchedulerState ret = GST_SCHEDULER_STATE_STOPPED;
GST_LOG_OBJECT (sched, "starting iteration in bin %s",
GST_ELEMENT_NAME (scheduler->parent));
sched->error = FALSE;
if (sched->schedule_now) {
ret = GST_SCHEDULER_STATE_RUNNING;
} else {
while (entries) {
if (can_schedule ((Entry *) entries->data)) {
Entry *entry = entries->data;
ret = GST_SCHEDULER_STATE_RUNNING;
sched->schedule_now = g_list_prepend (sched->schedule_now, entry);
sched->schedule_possible =
g_list_remove (sched->schedule_possible, entry);
sched->schedule_possible =
g_list_append (sched->schedule_possible, entry);
break;
}
entries = g_list_next (entries);
}
}
if (ret == GST_SCHEDULER_STATE_RUNNING)
schedule_next_element (sched);
if (sched->error || sched->schedule_now) {
GST_ERROR_OBJECT (sched, "returning error because of %s",
sched->error ? "element error" : "unschedulable elements");
#if 0
gst_entry_scheduler_show (scheduler);
#endif
return GST_SCHEDULER_STATE_ERROR;
#if 0
} else if (GST_STATE (GST_SCHEDULER (sched)->parent) == GST_STATE_PLAYING &&
ret == GST_SCHEDULER_STATE_STOPPED && scheduler->schedulers == NULL) {
GST_ERROR_OBJECT (sched,
"returning error because we contain running elements and we didn't do a thing");
gst_entry_scheduler_show (scheduler);
return GST_SCHEDULER_STATE_ERROR;
#endif
} else if (ret == GST_SCHEDULER_STATE_STOPPED) {
GST_INFO_OBJECT (sched, "done iterating returning STOPPED");
return GST_SCHEDULER_STATE_STOPPED;
} else {
return ret;
}
}
static const gchar *
print_state (CothreadPrivate * priv)
{
switch (priv->wait) {
case WAIT_FOR_NOTHING:
return "runnable";
case WAIT_FOR_PADS:
return "waiting for pads";
case WAIT_FOR_ANYTHING:
case WAIT_FOR_MUM:
default:
g_assert_not_reached ();
}
return "";
}
static void
print_entry (GstEntryScheduler * sched, Entry * entry)
{
if (ENTRY_IS_LINK (entry)) {
LinkPrivate *link = (LinkPrivate *) entry;
g_print (" %s", can_schedule (entry) ? "OK" : " ");
g_print (" %s:%s%s =>", GST_DEBUG_PAD_NAME (link->srcpad),
can_schedule_pad (link->srcpad) ? " (active)" : "");
g_print (" %s:%s%s", GST_DEBUG_PAD_NAME (link->sinkpad),
can_schedule_pad (link->sinkpad) ? " (active)" : "");
g_print ("%s\n", link->bufpen ? " FILLED" : "");
/* g_print (" %s %s:%s%s => %s:%s%s%s\n", can_schedule (entry) ? "OK" : " ", GST_DEBUG_PAD_NAME (link->srcpad),
link->src->can_schedule (link->srcpad) ? " (active)" : "",
GST_DEBUG_PAD_NAME (link->sink),
link->sink->can_schedule (link->sinkpad) ? "(active) " : "",
link->bufpen ? " FILLED" : "");
*/ } else if (ENTRY_IS_COTHREAD (entry)) {
CothreadPrivate *priv = (CothreadPrivate *) entry;
g_print (" %s %s (%s)\n", can_schedule (entry) ? "OK" : " ",
GST_ELEMENT_NAME (priv->element), print_state (priv));
} else {
g_assert_not_reached ();
}
}
static void
gst_entry_scheduler_show (GstScheduler * scheduler)
{
GstEntryScheduler *sched = GST_ENTRY_SCHEDULER (scheduler);
GList *list;
g_print ("entry points waiting:\n");
for (list = sched->waiting; list; list = g_list_next (list)) {
print_entry (sched, (Entry *) list->data);
}
g_print ("entry points to schedule now:\n");
for (list = sched->schedule_now; list; list = g_list_next (list)) {
print_entry (sched, (Entry *) list->data);
}
g_print ("entry points that might be scheduled:\n");
for (list = sched->schedule_possible; list; list = g_list_next (list)) {
print_entry (sched, (Entry *) list->data);
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GstSchedulerFactory *factory;
GST_DEBUG_CATEGORY_INIT (debug_scheduler, "entry" COTHREADS_NAME, 0,
"entry " COTHREADS_NAME "scheduler");
factory = gst_scheduler_factory_new ("entry" COTHREADS_NAME,
"A entry scheduler using " COTHREADS_NAME " cothreads",
GST_TYPE_ENTRY_SCHEDULER);
if (factory == NULL)
return FALSE;
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "gstentry" COTHREADS_NAME "scheduler", "an entry scheduler using " COTHREADS_NAME " cothreads", /* FIXME */
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)