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gstreamer/gst/schedulers/gstbasicscheduler.c
Benjamin Otte 5d353409c2 gst/gstelement.c: whoops, store the signal id correctly 
Original commit message from CVS:
* gst/gstelement.c: (gst_element_class_init):
whoops, store the signal id correctly
* gst/schedulers/gstbasicscheduler.c:
(gst_basic_scheduler_chain_wrapper):
detect infinfinfinfinfinf^Cinite loops in chain wrapper when the
chain function isn't linked
2004-05-13 15:07:56 +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>
#include "cothreads_compat.h"
GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
GST_DEBUG_CATEGORY_STATIC (debug_scheduler);
#define GST_CAT_DEFAULT debug_scheduler
typedef struct _GstSchedulerChain GstSchedulerChain;
#define GST_ELEMENT_THREADSTATE(elem) (GST_ELEMENT (elem)->sched_private)
#define GST_RPAD_BUFPEN(pad) (GST_REAL_PAD(pad)->sched_private)
#define GST_ELEMENT_COTHREAD_STOPPING GST_ELEMENT_SCHEDULER_PRIVATE1
#define GST_ELEMENT_IS_COTHREAD_STOPPING(element) GST_FLAG_IS_SET((element), GST_ELEMENT_COTHREAD_STOPPING)
typedef struct _GstBasicScheduler GstBasicScheduler;
typedef struct _GstBasicSchedulerClass GstBasicSchedulerClass;
#ifdef _COTHREADS_STANDARD
# define _SCHEDULER_NAME "standard"
#else
# define _SCHEDULER_NAME "basic"
#endif
struct _GstSchedulerChain
{
GstBasicScheduler *sched;
GList *disabled;
GList *elements;
gint num_elements;
GstElement *entry;
gint cothreaded_elements;
gboolean schedule;
};
#define GST_TYPE_BASIC_SCHEDULER \
(gst_basic_scheduler_get_type())
#define GST_BASIC_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASIC_SCHEDULER,GstBasicScheduler))
#define GST_BASIC_SCHEDULER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASIC_SCHEDULER,GstBasicSchedulerClass))
#define GST_IS_BASIC_SCHEDULER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASIC_SCHEDULER))
#define GST_IS_BASIC_SCHEDULER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASIC_SCHEDULER))
#define SCHED(element) GST_BASIC_SCHEDULER (GST_ELEMENT_SCHED (element))
typedef enum
{
GST_BASIC_SCHEDULER_STATE_NONE,
GST_BASIC_SCHEDULER_STATE_STOPPED,
GST_BASIC_SCHEDULER_STATE_ERROR,
GST_BASIC_SCHEDULER_STATE_RUNNING,
}
GstBasicSchedulerState;
typedef enum
{
/* something important has changed inside the scheduler */
GST_BASIC_SCHEDULER_CHANGE = GST_SCHEDULER_FLAG_LAST,
}
GstBasicSchedulerFlags;
struct _GstBasicScheduler
{
GstScheduler parent;
GList *elements;
gint num_elements;
GList *chains;
gint num_chains;
GstBasicSchedulerState state;
cothread_context *context;
GstElement *current;
};
struct _GstBasicSchedulerClass
{
GstSchedulerClass parent_class;
};
static GType _gst_basic_scheduler_type = 0;
static void gst_basic_scheduler_class_init (GstBasicSchedulerClass * klass);
static void gst_basic_scheduler_init (GstBasicScheduler * scheduler);
static void gst_basic_scheduler_dispose (GObject * object);
static void gst_basic_scheduler_setup (GstScheduler * sched);
static void gst_basic_scheduler_reset (GstScheduler * sched);
static void gst_basic_scheduler_add_element (GstScheduler * sched,
GstElement * element);
static void gst_basic_scheduler_remove_element (GstScheduler * sched,
GstElement * element);
static GstElementStateReturn gst_basic_scheduler_state_transition (GstScheduler
* sched, GstElement * element, gint transition);
static gboolean gst_basic_scheduler_yield (GstScheduler * sched,
GstElement * element);
static gboolean gst_basic_scheduler_interrupt (GstScheduler * sched,
GstElement * element);
static void gst_basic_scheduler_error (GstScheduler * sched,
GstElement * element);
static void gst_basic_scheduler_pad_link (GstScheduler * sched, GstPad * srcpad,
GstPad * sinkpad);
static void gst_basic_scheduler_pad_unlink (GstScheduler * sched,
GstPad * srcpad, GstPad * sinkpad);
static GstData *gst_basic_scheduler_pad_select (GstScheduler * sched,
GstPad ** selected, GstPad ** padlist);
static GstSchedulerState gst_basic_scheduler_iterate (GstScheduler * sched);
static void gst_basic_scheduler_show (GstScheduler * sched);
static GstSchedulerClass *parent_class = NULL;
/* for threaded bins, these pre- and post-run functions lock and unlock the
* elements. we have to avoid deadlocks, so we make these convenience macros
* that will avoid using do_cothread_switch from within the scheduler. */
#define do_element_switch(element) G_STMT_START{ \
GstElement *from = SCHED (element)->current; \
if (from && from->post_run_func) \
from->post_run_func (from); \
SCHED (element)->current = element; \
if (element->pre_run_func) \
element->pre_run_func (element); \
do_cothread_switch (GST_ELEMENT_THREADSTATE (element)); \
}G_STMT_END
#define do_switch_to_main(sched) G_STMT_START{ \
GstElement *current = ((GstBasicScheduler*)sched)->current; \
if (current && current->post_run_func) \
current->post_run_func (current); \
((GstBasicScheduler*) sched)->current = NULL; \
do_cothread_switch \
(do_cothread_get_main \
(((GstBasicScheduler*)sched)->context)); \
}G_STMT_END
#define do_switch_from_main(entry) G_STMT_START{ \
if (entry->pre_run_func) \
entry->pre_run_func (entry); \
SCHED (entry)->current = entry; \
do_cothread_switch (GST_ELEMENT_THREADSTATE (entry)); \
}G_STMT_END
static GType
gst_basic_scheduler_get_type (void)
{
if (!_gst_basic_scheduler_type) {
static const GTypeInfo scheduler_info = {
sizeof (GstBasicSchedulerClass),
NULL,
NULL,
(GClassInitFunc) gst_basic_scheduler_class_init,
NULL,
NULL,
sizeof (GstBasicScheduler),
0,
(GInstanceInitFunc) gst_basic_scheduler_init,
NULL
};
_gst_basic_scheduler_type =
g_type_register_static (GST_TYPE_SCHEDULER,
"Gst" COTHREADS_NAME_CAPITAL "Scheduler", &scheduler_info, 0);
}
return _gst_basic_scheduler_type;
}
static void
gst_basic_scheduler_class_init (GstBasicSchedulerClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstSchedulerClass *gstscheduler_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
gstscheduler_class = (GstSchedulerClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_SCHEDULER);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_basic_scheduler_dispose);
gstscheduler_class->setup = GST_DEBUG_FUNCPTR (gst_basic_scheduler_setup);
gstscheduler_class->reset = GST_DEBUG_FUNCPTR (gst_basic_scheduler_reset);
gstscheduler_class->add_element =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_add_element);
gstscheduler_class->remove_element =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_remove_element);
gstscheduler_class->state_transition =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_state_transition);
gstscheduler_class->yield = GST_DEBUG_FUNCPTR (gst_basic_scheduler_yield);
gstscheduler_class->interrupt =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_interrupt);
gstscheduler_class->error = GST_DEBUG_FUNCPTR (gst_basic_scheduler_error);
gstscheduler_class->pad_link =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_link);
gstscheduler_class->pad_unlink =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_unlink);
gstscheduler_class->pad_select =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_pad_select);
gstscheduler_class->clock_wait = NULL;
gstscheduler_class->iterate = GST_DEBUG_FUNCPTR (gst_basic_scheduler_iterate);
gstscheduler_class->show = GST_DEBUG_FUNCPTR (gst_basic_scheduler_show);
do_cothreads_init (NULL);
}
static void
gst_basic_scheduler_init (GstBasicScheduler * scheduler)
{
scheduler->elements = NULL;
scheduler->num_elements = 0;
scheduler->chains = NULL;
scheduler->num_chains = 0;
GST_FLAG_SET (scheduler, GST_SCHEDULER_FLAG_NEW_API);
}
static void
gst_basic_scheduler_dispose (GObject * object)
{
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GstSchedulerFactory *factory;
GST_DEBUG_CATEGORY_INIT (debug_dataflow, "basic_dataflow", 0,
"basic scheduler dataflow");
GST_DEBUG_CATEGORY_INIT (debug_scheduler, "basic_scheduler", 0,
"basic scheduler general information");
factory = gst_scheduler_factory_new ("basic" COTHREADS_NAME,
"A basic scheduler using " COTHREADS_NAME " cothreads",
gst_basic_scheduler_get_type ());
if (factory != NULL) {
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
} else {
g_warning ("could not register scheduler: " COTHREADS_NAME);
}
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstbasic" COTHREADS_NAME "scheduler",
"a basic scheduler using " COTHREADS_NAME " cothreads",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)
static int gst_basic_scheduler_loopfunc_wrapper (int argc, char **argv)
{
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG ("entering loopfunc wrapper of %s", name);
gst_object_ref (GST_OBJECT (element));
do {
GST_CAT_DEBUG (debug_dataflow, "calling loopfunc %s for element %s",
GST_DEBUG_FUNCPTR_NAME (element->loopfunc), name);
(element->loopfunc) (element);
GST_CAT_DEBUG (debug_dataflow, "element %s ended loop function", name);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
/* due to oddities in the cothreads code, when this function returns it will
* switch to the main cothread. thus, we need to unlock the current element. */
if (SCHED (element)) {
if (SCHED (element)->current && SCHED (element)->current->post_run_func) {
SCHED (element)->current->post_run_func (SCHED (element)->current);
}
SCHED (element)->current = NULL;
}
GST_DEBUG ("leaving loopfunc wrapper of %s", name);
gst_object_unref (GST_OBJECT (element));
return 0;
}
static int
gst_basic_scheduler_chain_wrapper (int argc, char **argv)
{
GSList *already_iterated = NULL;
GstElement *element = GST_ELEMENT (argv);
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG ("entered chain wrapper of element %s", name);
GST_CAT_DEBUG (debug_dataflow, "stepping through pads");
gst_object_ref (GST_OBJECT (element));
do {
GList *pads;
do {
pads = element->pads;
while (pads) {
GstPad *pad = GST_PAD (pads->data);
GstRealPad *realpad;
if (!GST_IS_REAL_PAD (pad))
continue;
realpad = GST_REAL_PAD (pad);
if (GST_RPAD_DIRECTION (realpad) == GST_PAD_SINK &&
GST_PAD_IS_LINKED (realpad) &&
g_slist_find (already_iterated, pad) == NULL) {
GstData *data;
GST_CAT_DEBUG (debug_dataflow, "pulling data from %s:%s", name,
GST_PAD_NAME (pad));
data = gst_pad_pull (pad);
if (data) {
if (GST_IS_EVENT (data) && !GST_ELEMENT_IS_EVENT_AWARE (element)) {
gst_pad_send_event (pad, GST_EVENT (data));
} else {
GST_CAT_DEBUG (debug_dataflow,
"calling chain function of %s:%s %p", name,
GST_PAD_NAME (pad), data);
gst_pad_call_chain_function (GST_PAD (realpad), data);
GST_CAT_DEBUG (debug_dataflow,
"calling chain function of element %s done", name);
}
}
already_iterated = g_slist_prepend (already_iterated, pad);
break;
}
pads = g_list_next (pads);
}
} while (pads != NULL);
if (already_iterated == NULL) {
GST_DEBUG_OBJECT (SCHED (element), "nothing to iterate for element %s",
GST_ELEMENT_NAME (element));
break;
}
g_slist_free (already_iterated);
already_iterated = NULL;
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
/* due to oddities in the cothreads code, when this function returns it will
* switch to the main cothread. thus, we need to unlock the current element. */
if (SCHED (element)) {
if (SCHED (element)->current && SCHED (element)->current->post_run_func) {
SCHED (element)->current->post_run_func (SCHED (element)->current);
}
SCHED (element)->current = NULL;
}
GST_CAT_DEBUG (debug_dataflow, "leaving chain wrapper of element %s", name);
gst_object_unref (GST_OBJECT (element));
return 0;
}
static int
gst_basic_scheduler_src_wrapper (int argc, char **argv)
{
GstElement *element = GST_ELEMENT (argv);
GList *pads;
GstRealPad *realpad;
GstData *data = NULL;
gboolean inf_loop;
G_GNUC_UNUSED const gchar *name = GST_ELEMENT_NAME (element);
GST_DEBUG ("entering src wrapper of element %s", name);
do {
inf_loop = TRUE;
pads = element->pads;
while (pads) {
if (!GST_IS_REAL_PAD (pads->data))
continue;
realpad = GST_REAL_PAD (pads->data);
pads = g_list_next (pads);
if (GST_RPAD_DIRECTION (realpad) == GST_PAD_SRC) {
inf_loop = FALSE;
GST_CAT_DEBUG (debug_dataflow, "calling _getfunc for %s:%s",
GST_DEBUG_PAD_NAME (realpad));
data = gst_pad_call_get_function (GST_PAD (realpad));
if (data) {
GST_CAT_DEBUG (debug_dataflow, "calling gst_pad_push on pad %s:%s %p",
GST_DEBUG_PAD_NAME (realpad), data);
gst_pad_push (GST_PAD (realpad), data);
}
}
}
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element) && !inf_loop);
GST_FLAG_UNSET (element, GST_ELEMENT_COTHREAD_STOPPING);
/* due to oddities in the cothreads code, when this function returns it will
* switch to the main cothread. thus, we need to unlock the current element. */
if (SCHED (element)->current->post_run_func)
SCHED (element)->current->post_run_func (SCHED (element)->current);
SCHED (element)->current = NULL;
GST_DEBUG ("leaving src wrapper of element %s", name);
return 0;
}
static void
gst_basic_scheduler_chainhandler_proxy (GstPad * pad, GstData * data)
{
gint loop_count = 100;
GstElement *parent;
GstRealPad *peer;
parent = GST_PAD_PARENT (pad);
peer = GST_RPAD_PEER (pad);
GST_CAT_DEBUG (debug_dataflow, "putting buffer %p in peer \"%s:%s\"'s pen",
data, GST_DEBUG_PAD_NAME (peer));
/*
* loop until the bufferpen is empty so we can fill it up again
*/
while (GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) != NULL && --loop_count) {
GST_CAT_DEBUG (debug_dataflow, "switching to %p to empty bufpen %d",
GST_ELEMENT_THREADSTATE (parent), loop_count);
do_element_switch (parent);
/* we may no longer be the same pad, check. */
if (GST_RPAD_PEER (peer) != (GstRealPad *) pad) {
GST_CAT_DEBUG (debug_dataflow, "new pad in mid-switch!");
pad = (GstPad *) GST_RPAD_PEER (peer);
}
parent = GST_PAD_PARENT (pad);
peer = GST_RPAD_PEER (pad);
}
if (loop_count == 0) {
GST_ELEMENT_ERROR (parent, CORE, SCHEDULER, (NULL),
("(internal error) basic: maximum number of switches exceeded"));
return;
}
g_assert (GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) == NULL);
/* now fill the bufferpen and switch so it can be consumed */
GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) = data;
GST_CAT_DEBUG (debug_dataflow, "switching to %p to consume buffer %p",
GST_ELEMENT_THREADSTATE (GST_PAD_PARENT (pad)), data);
do_element_switch (parent);
GST_CAT_DEBUG (debug_dataflow, "leaving chainhandler proxy of %s:%s",
GST_DEBUG_PAD_NAME (pad));
}
static void
gst_basic_scheduler_select_proxy (GstPad * pad, GstData * data)
{
GstElement *parent;
parent = GST_PAD_PARENT (pad);
GST_CAT_DEBUG (debug_dataflow, "putting buffer %p in peer's pen of pad %s:%s",
data, GST_DEBUG_PAD_NAME (pad));
g_assert (GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) == NULL);
/* now fill the bufferpen and switch so it can be consumed */
GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)) = data;
GST_CAT_DEBUG (debug_dataflow, "switching to %p",
GST_ELEMENT_THREADSTATE (parent));
/* FIXME temporarily diabled */
/* parent->select_pad = pad; */
do_element_switch (parent);
GST_CAT_DEBUG (debug_dataflow, "done switching");
}
static GstData *
gst_basic_scheduler_gethandler_proxy (GstPad * pad)
{
GstData *data;
GstElement *parent;
GstRealPad *peer;
GST_CAT_DEBUG (debug_dataflow, "entering gethandler proxy of %s:%s",
GST_DEBUG_PAD_NAME (pad));
parent = GST_PAD_PARENT (pad);
peer = GST_RPAD_PEER (pad);
/* FIXME this should be bounded */
/* we will loop switching to the peer until it's filled up the bufferpen */
while (GST_RPAD_BUFPEN (pad) == NULL) {
GST_CAT_DEBUG (debug_dataflow, "switching to \"%s\": %p to fill bufpen",
GST_ELEMENT_NAME (parent), GST_ELEMENT_THREADSTATE (parent));
do_element_switch (parent);
/* we may no longer be the same pad, check. */
if (GST_RPAD_PEER (peer) != (GstRealPad *) pad) {
GST_CAT_DEBUG (debug_dataflow, "new pad in mid-switch!");
pad = (GstPad *) GST_RPAD_PEER (peer);
if (!pad) {
GST_ELEMENT_ERROR (parent, CORE, PAD, (NULL), ("pad unlinked"));
}
parent = GST_PAD_PARENT (pad);
peer = GST_RPAD_PEER (pad);
}
}
GST_CAT_DEBUG (debug_dataflow, "done switching");
/* now grab the buffer from the pen, clear the pen, and return the buffer */
data = GST_RPAD_BUFPEN (pad);
GST_RPAD_BUFPEN (pad) = NULL;
GST_CAT_DEBUG (debug_dataflow, "leaving gethandler proxy of %s:%s",
GST_DEBUG_PAD_NAME (pad));
return data;
}
static gboolean
gst_basic_scheduler_eventhandler_proxy (GstPad * srcpad, GstEvent * event)
{
gboolean flush;
GST_CAT_INFO (debug_dataflow, "intercepting event %d on pad %s:%s",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (srcpad));
/* figure out if we need to flush */
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) {
GstData *data = GST_RPAD_BUFPEN (srcpad);
GST_CAT_INFO (debug_dataflow, "event is flush");
if (data) {
GST_CAT_INFO (debug_dataflow, "need to clear some buffers");
gst_data_unref (data);
GST_RPAD_BUFPEN (srcpad) = NULL;
}
}
return GST_RPAD_EVENTFUNC (srcpad) (srcpad, event);
}
static gboolean
gst_basic_scheduler_cothreaded_chain (GstBin * bin, GstSchedulerChain * chain)
{
GList *elements;
GstElement *element;
cothread_func wrapper_function;
const GList *pads;
GstPad *pad;
GST_DEBUG ("chain is using COTHREADS");
g_assert (chain->sched->context != NULL);
/* walk through all the chain's elements */
elements = chain->elements;
while (elements) {
gboolean decoupled;
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
decoupled = GST_FLAG_IS_SET (element, GST_ELEMENT_DECOUPLED);
/* start out without a wrapper function, we select it later */
wrapper_function = NULL;
/* if the element has a loopfunc... */
if (element->loopfunc != NULL) {
wrapper_function =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_loopfunc_wrapper);
GST_DEBUG ("element '%s' is a loop-based", GST_ELEMENT_NAME (element));
} else {
/* otherwise we need to decide what kind of cothread
* if it's not DECOUPLED, we decide based on
* whether it's a source or not */
if (!decoupled) {
/* if it doesn't have any sinks, it must be a source (duh) */
if (element->numsinkpads == 0) {
wrapper_function =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_src_wrapper);
GST_DEBUG ("element '%s' is a source, using _src_wrapper",
GST_ELEMENT_NAME (element));
} else {
wrapper_function =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_chain_wrapper);
GST_DEBUG ("element '%s' is a filter, using _chain_wrapper",
GST_ELEMENT_NAME (element));
}
}
}
/* now we have to walk through the pads to set up their state */
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *peerpad;
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD (pad))
continue;
peerpad = GST_PAD_PEER (pad);
if (peerpad) {
GstElement *peerelement = GST_ELEMENT (GST_PAD_PARENT (peerpad));
gboolean different_sched =
(peerelement->sched != GST_SCHEDULER (chain->sched));
gboolean peer_decoupled =
GST_FLAG_IS_SET (peerelement, GST_ELEMENT_DECOUPLED);
GST_DEBUG ("inspecting pad %s:%s", GST_DEBUG_PAD_NAME (peerpad));
/* we don't need to check this for decoupled elements */
if (!decoupled) {
/* if the peer element is in another schedule,
* it's not decoupled and we are not decoupled
* either, we have an error */
if (different_sched && !peer_decoupled) {
GST_ELEMENT_ERROR (element, CORE, SCHEDULER, (NULL),
("element \"%s\" is not decoupled but has pads in different schedulers",
GST_ELEMENT_NAME (element)));
return FALSE;
}
/* ok, the peer is in a different scheduler and is decoupled,
* we need to set the
* handlers so we can talk with it */
else if (different_sched) {
if (GST_RPAD_DIRECTION (peerpad) == GST_PAD_SINK) {
GST_DEBUG ("copying chain func into push proxy for peer %s:%s",
GST_DEBUG_PAD_NAME (peerpad));
GST_RPAD_CHAINHANDLER (peerpad) = gst_pad_call_chain_function;
} else {
GST_DEBUG ("copying get func into pull proxy for peer %s:%s",
GST_DEBUG_PAD_NAME (peerpad));
GST_RPAD_GETHANDLER (peerpad) = gst_pad_call_get_function;
}
}
}
/* in any case we need to copy the eventfunc into the handler */
GST_RPAD_EVENTHANDLER (peerpad) = GST_RPAD_EVENTFUNC (peerpad);
}
/* if the element is DECOUPLED or outside the manager, we have to chain */
if (decoupled) {
/* set the chain proxies */
if (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK) {
GST_DEBUG ("copying chain function into push proxy for %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_CHAINHANDLER (pad) = gst_pad_call_chain_function;
} else {
GST_DEBUG ("copying get function into pull proxy for %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_GETHANDLER (pad) = gst_pad_call_get_function;
}
}
/* otherwise we really are a cothread */
else {
if (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK) {
GST_DEBUG ("setting cothreaded push proxy for sinkpad %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_CHAINHANDLER (pad) =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_chainhandler_proxy);
GST_RPAD_EVENTHANDLER (pad) = GST_RPAD_EVENTFUNC (pad);
} else {
GST_DEBUG ("setting cothreaded pull proxy for srcpad %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_RPAD_GETHANDLER (pad) =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_gethandler_proxy);
/* the gethandler proxy function can queue a buffer in the bufpen, we need
* to remove this buffer when a flush event is sent on the pad */
GST_RPAD_EVENTHANDLER (pad) =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_eventhandler_proxy);
}
}
}
/* need to set up the cothread now */
if (wrapper_function != NULL) {
if (GST_ELEMENT_THREADSTATE (element) == NULL) {
GST_DEBUG ("about to create a cothread, wrapper for '%s' is &%s",
GST_ELEMENT_NAME (element),
GST_DEBUG_FUNCPTR_NAME (wrapper_function));
do_cothread_create (GST_ELEMENT_THREADSTATE (element),
chain->sched->context, wrapper_function, 0, (char **) element);
if (GST_ELEMENT_THREADSTATE (element) == NULL) {
GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, (NULL),
("could not create cothread for \"%s\"",
GST_ELEMENT_NAME (element)));
return FALSE;
}
GST_DEBUG ("created cothread %p for '%s'",
GST_ELEMENT_THREADSTATE (element), GST_ELEMENT_NAME (element));
} else {
/* set the cothread wrapper function */
GST_DEBUG ("about to set the wrapper function for '%s' to &%s",
GST_ELEMENT_NAME (element),
GST_DEBUG_FUNCPTR_NAME (wrapper_function));
do_cothread_setfunc (GST_ELEMENT_THREADSTATE (element),
chain->sched->context, wrapper_function, 0, (char **) element);
GST_DEBUG ("set wrapper function for '%s' to &%s",
GST_ELEMENT_NAME (element),
GST_DEBUG_FUNCPTR_NAME (wrapper_function));
}
}
}
return TRUE;
}
static GstSchedulerChain *
gst_basic_scheduler_chain_new (GstBasicScheduler * sched)
{
GstSchedulerChain *chain = g_new (GstSchedulerChain, 1);
/* initialize the chain with sane values */
chain->sched = sched;
chain->disabled = NULL;
chain->elements = NULL;
chain->num_elements = 0;
chain->entry = NULL;
chain->cothreaded_elements = 0;
chain->schedule = FALSE;
/* add the chain to the schedulers' list of chains */
sched->chains = g_list_prepend (sched->chains, chain);
sched->num_chains++;
/* notify the scheduler that something changed */
GST_FLAG_SET (sched, GST_BASIC_SCHEDULER_CHANGE);
GST_INFO ("created new chain %p, now are %d chains in sched %p",
chain, sched->num_chains, sched);
return chain;
}
static void
gst_basic_scheduler_chain_destroy (GstSchedulerChain * chain)
{
GstBasicScheduler *sched = chain->sched;
/* remove the chain from the schedulers' list of chains */
sched->chains = g_list_remove (sched->chains, chain);
sched->num_chains--;
/* destroy the chain */
g_list_free (chain->disabled); /* should be empty... */
g_list_free (chain->elements); /* ditto */
GST_INFO ("destroyed chain %p, now are %d chains in sched %p", chain,
sched->num_chains, sched);
g_free (chain);
/* notify the scheduler that something changed */
GST_FLAG_SET (sched, GST_BASIC_SCHEDULER_CHANGE);
}
static void
gst_basic_scheduler_chain_add_element (GstSchedulerChain * chain,
GstElement * element)
{
/* set the sched pointer for the element */
element->sched = GST_SCHEDULER (chain->sched);
/* add the element to either the main list or the disabled list */
if (GST_STATE (element) == GST_STATE_PLAYING) {
GST_INFO ("adding element \"%s\" to chain %p enabled",
GST_ELEMENT_NAME (element), chain);
chain->elements = g_list_prepend (chain->elements, element);
} else {
GST_INFO ("adding element \"%s\" to chain %p disabled",
GST_ELEMENT_NAME (element), chain);
chain->disabled = g_list_prepend (chain->disabled, element);
}
chain->num_elements++;
/* notify the scheduler that something changed */
GST_FLAG_SET (chain->sched, GST_BASIC_SCHEDULER_CHANGE);
}
static gboolean
gst_basic_scheduler_chain_enable_element (GstSchedulerChain * chain,
GstElement * element)
{
GST_INFO ("enabling element \"%s\" in chain %p",
GST_ELEMENT_NAME (element), chain);
/* remove from disabled list */
chain->disabled = g_list_remove (chain->disabled, element);
/* add to elements list */
chain->elements = g_list_prepend (chain->elements, element);
/* notify the scheduler that something changed */
GST_FLAG_SET (chain->sched, GST_BASIC_SCHEDULER_CHANGE);
/* GST_FLAG_UNSET(element, GST_ELEMENT_COTHREAD_STOPPING); */
/* reschedule the chain */
return gst_basic_scheduler_cothreaded_chain (GST_BIN (GST_SCHEDULER (chain->
sched)->parent), chain);
}
static void
gst_basic_scheduler_chain_disable_element (GstSchedulerChain * chain,
GstElement * element)
{
GST_INFO ("disabling element \"%s\" in chain %p",
GST_ELEMENT_NAME (element), chain);
/* remove from elements list */
chain->elements = g_list_remove (chain->elements, element);
/* add to disabled list */
chain->disabled = g_list_prepend (chain->disabled, element);
/* notify the scheduler that something changed */
GST_FLAG_SET (chain->sched, GST_BASIC_SCHEDULER_CHANGE);
GST_FLAG_SET (element, GST_ELEMENT_COTHREAD_STOPPING);
/* reschedule the chain */
/* FIXME this should be done only if manager state != NULL */
/* gst_basic_scheduler_cothreaded_chain(GST_BIN(chain->sched->parent),chain); */
}
static void
gst_basic_scheduler_chain_remove_element (GstSchedulerChain * chain,
GstElement * element)
{
GST_INFO ("removing element \"%s\" from chain %p", GST_ELEMENT_NAME (element),
chain);
/* if it's active, deactivate it */
if (g_list_find (chain->elements, element)) {
gst_basic_scheduler_chain_disable_element (chain, element);
}
/* we have to check for a threadstate here because a queue doesn't have one */
if (GST_ELEMENT_THREADSTATE (element)) {
do_cothread_destroy (GST_ELEMENT_THREADSTATE (element));
GST_ELEMENT_THREADSTATE (element) = NULL;
}
/* remove the element from the list of elements */
chain->disabled = g_list_remove (chain->disabled, element);
chain->num_elements--;
/* notify the scheduler that something changed */
GST_FLAG_SET (chain->sched, GST_BASIC_SCHEDULER_CHANGE);
/* if there are no more elements in the chain, destroy the chain */
if (chain->num_elements == 0)
gst_basic_scheduler_chain_destroy (chain);
}
static void
gst_basic_scheduler_chain_elements (GstBasicScheduler * sched,
GstElement * element1, GstElement * element2)
{
GList *chains;
GstSchedulerChain *chain;
GstSchedulerChain *chain1 = NULL, *chain2 = NULL;
GstElement *element;
/* first find the chains that hold the two */
chains = sched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
if (g_list_find (chain->disabled, element1))
chain1 = chain;
else if (g_list_find (chain->elements, element1))
chain1 = chain;
if (g_list_find (chain->disabled, element2))
chain2 = chain;
else if (g_list_find (chain->elements, element2))
chain2 = chain;
}
/* first check to see if they're in the same chain, we're done if that's the case */
if ((chain1 != NULL) && (chain1 == chain2)) {
GST_INFO ("elements are already in the same chain");
return;
}
/* now, if neither element has a chain, create one */
if ((chain1 == NULL) && (chain2 == NULL)) {
GST_INFO ("creating new chain to hold two new elements");
chain = gst_basic_scheduler_chain_new (sched);
gst_basic_scheduler_chain_add_element (chain, element1);
gst_basic_scheduler_chain_add_element (chain, element2);
/* FIXME chain changed here */
/* gst_basic_scheduler_cothreaded_chain(chain->sched->parent,chain); */
/* otherwise if both have chains already, join them */
} else if ((chain1 != NULL) && (chain2 != NULL)) {
GST_INFO ("merging chain %p into chain %p", chain2, chain1);
/* take the contents of chain2 and merge them into chain1 */
chain1->disabled =
g_list_concat (chain1->disabled, g_list_copy (chain2->disabled));
chain1->elements =
g_list_concat (chain1->elements, g_list_copy (chain2->elements));
chain1->num_elements += chain2->num_elements;
gst_basic_scheduler_chain_destroy (chain2);
if (sched->context)
gst_basic_scheduler_cothreaded_chain (GST_BIN (GST_SCHEDULER (chain1->
sched)->parent), chain1);
/* otherwise one has a chain already, the other doesn't */
} else {
/* pick out which one has the chain, and which doesn't */
if (chain1 != NULL)
chain = chain1, element = element2;
else
chain = chain2, element = element1;
GST_INFO ("adding element to existing chain");
gst_basic_scheduler_chain_add_element (chain, element);
/* FIXME chain changed here */
/* gst_basic_scheduler_cothreaded_chain(chain->sched->parent,chain); */
}
}
/* find the chain within the scheduler that holds the element, if any */
static GstSchedulerChain *
gst_basic_scheduler_find_chain (GstBasicScheduler * sched, GstElement * element)
{
GList *chains;
GstSchedulerChain *chain;
GST_INFO ("searching for element \"%s\" in chains",
GST_ELEMENT_NAME (element));
chains = sched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
if (g_list_find (chain->elements, element))
return chain;
if (g_list_find (chain->disabled, element))
return chain;
}
return NULL;
}
static void
gst_basic_scheduler_chain_recursive_add (GstSchedulerChain * chain,
GstElement * element, gboolean remove)
{
GList *pads;
GstPad *pad;
GstElement *peerelement;
GstSchedulerChain *prevchain;
/* check to see if it's in a chain already */
prevchain = gst_basic_scheduler_find_chain (chain->sched, element);
/* if it's already in another chain, either remove or punt */
if (prevchain != NULL) {
if (remove == TRUE)
gst_basic_scheduler_chain_remove_element (prevchain, element);
else
return;
}
/* add it to this one */
gst_basic_scheduler_chain_add_element (chain, element);
GST_DEBUG ("recursing on element \"%s\"", GST_ELEMENT_NAME (element));
/* now go through all the pads and see which peers can be added */
pads = element->pads;
while (pads) {
pad = GST_PAD (pads->data);
pads = g_list_next (pads);
GST_DEBUG ("have pad %s:%s, checking for valid peer",
GST_DEBUG_PAD_NAME (pad));
/* if the peer exists and could be in the same chain */
if (GST_PAD_PEER (pad)) {
GST_DEBUG ("has peer %s:%s", GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)));
peerelement = GST_PAD_PARENT (GST_PAD_PEER (pad));
if (GST_ELEMENT_SCHED (GST_PAD_PARENT (pad)) ==
GST_ELEMENT_SCHED (peerelement)) {
GST_DEBUG ("peer \"%s\" is valid for same chain",
GST_ELEMENT_NAME (peerelement));
gst_basic_scheduler_chain_recursive_add (chain, peerelement, remove);
}
}
}
}
/*
* Entry points for this scheduler.
*/
static void
gst_basic_scheduler_setup (GstScheduler * sched)
{
/* first create thread context */
if (GST_BASIC_SCHEDULER (sched)->context == NULL) {
GST_DEBUG ("initializing cothread context");
GST_BASIC_SCHEDULER (sched)->context = do_cothread_context_init ();
}
}
static void
gst_basic_scheduler_reset (GstScheduler * sched)
{
cothread_context *ctx;
GList *elements = GST_BASIC_SCHEDULER (sched)->elements;
while (elements) {
GstElement *element = GST_ELEMENT (elements->data);
if (GST_ELEMENT_THREADSTATE (element)) {
do_cothread_destroy (GST_ELEMENT_THREADSTATE (element));
GST_ELEMENT_THREADSTATE (element) = NULL;
}
elements = g_list_next (elements);
}
ctx = GST_BASIC_SCHEDULER (sched)->context;
do_cothread_context_destroy (ctx);
GST_BASIC_SCHEDULER (sched)->context = NULL;
}
static void
gst_basic_scheduler_add_element (GstScheduler * sched, GstElement * element)
{
GstSchedulerChain *chain;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
GST_INFO ("adding element \"%s\" to scheduler", GST_ELEMENT_NAME (element));
/* only deal with elements after this point, not bins */
/* exception is made for Bin's that are schedulable, like the autoplugger */
if (GST_IS_BIN (element)
&& !GST_FLAG_IS_SET (element, GST_BIN_SELF_SCHEDULABLE))
return;
/* first add it to the list of elements that are to be scheduled */
bsched->elements = g_list_prepend (bsched->elements, element);
bsched->num_elements++;
/* create a chain to hold it, and add */
chain = gst_basic_scheduler_chain_new (bsched);
gst_basic_scheduler_chain_add_element (chain, element);
}
static void
gst_basic_scheduler_remove_element (GstScheduler * sched, GstElement * element)
{
GstSchedulerChain *chain;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
if (g_list_find (bsched->elements, element)) {
GST_INFO ("removing element \"%s\" from scheduler",
GST_ELEMENT_NAME (element));
/* if we are removing the currently scheduled element */
if (bsched->current == element) {
GST_FLAG_SET (element, GST_ELEMENT_COTHREAD_STOPPING);
if (element->post_run_func)
element->post_run_func (element);
bsched->current = NULL;
}
/* find what chain the element is in */
chain = gst_basic_scheduler_find_chain (bsched, element);
/* remove it from its chain */
if (chain != NULL) {
gst_basic_scheduler_chain_remove_element (chain, element);
}
/* remove it from the list of elements */
bsched->elements = g_list_remove (bsched->elements, element);
bsched->num_elements--;
/* unset the scheduler pointer in the element */
}
}
static GstElementStateReturn
gst_basic_scheduler_state_transition (GstScheduler * sched,
GstElement * element, gint transition)
{
GstSchedulerChain *chain;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
/* check if our parent changed state */
if (GST_SCHEDULER_PARENT (sched) == element) {
GST_INFO ("parent \"%s\" changed state", GST_ELEMENT_NAME (element));
if (transition == GST_STATE_PLAYING_TO_PAUSED) {
GST_INFO ("setting scheduler state to stopped");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_STOPPED;
} else if (transition == GST_STATE_PAUSED_TO_PLAYING) {
GST_INFO ("setting scheduler state to running");
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_RUNNING;
} else {
GST_INFO ("no interesting state change, doing nothing");
}
} else if (transition == GST_STATE_PLAYING_TO_PAUSED ||
transition == GST_STATE_PAUSED_TO_PLAYING) {
/* find the chain the element is in */
chain = gst_basic_scheduler_find_chain (bsched, element);
/* remove it from the chain */
if (chain) {
if (transition == GST_STATE_PLAYING_TO_PAUSED) {
gst_basic_scheduler_chain_disable_element (chain, element);
} else if (transition == GST_STATE_PAUSED_TO_PLAYING) {
if (!gst_basic_scheduler_chain_enable_element (chain, element)) {
GST_INFO ("could not enable element \"%s\"",
GST_ELEMENT_NAME (element));
return GST_STATE_FAILURE;
}
}
} else {
GST_INFO ("element \"%s\" not found in any chain, no state change",
GST_ELEMENT_NAME (element));
}
}
return GST_STATE_SUCCESS;
}
static gboolean
gst_basic_scheduler_yield (GstScheduler * sched, GstElement * element)
{
if (GST_ELEMENT_IS_COTHREAD_STOPPING (element)) {
do_switch_to_main (sched);
/* no need to do a pre_run, the cothread is stopping */
}
return FALSE;
}
static gboolean
gst_basic_scheduler_interrupt (GstScheduler * sched, GstElement * element)
{
GST_FLAG_SET (element, GST_ELEMENT_COTHREAD_STOPPING);
do_switch_to_main (sched);
return FALSE;
}
static void
gst_basic_scheduler_error (GstScheduler * sched, GstElement * element)
{
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
if (GST_ELEMENT_THREADSTATE (element)) {
GstSchedulerChain *chain;
chain = gst_basic_scheduler_find_chain (bsched, element);
if (chain)
gst_basic_scheduler_chain_disable_element (chain, element);
GST_SCHEDULER_STATE (sched) = GST_SCHEDULER_STATE_ERROR;
do_switch_to_main (sched);
}
}
static void
gst_basic_scheduler_pad_link (GstScheduler * sched, GstPad * srcpad,
GstPad * sinkpad)
{
GstElement *srcelement, *sinkelement;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
srcelement = GST_PAD_PARENT (srcpad);
g_return_if_fail (srcelement != NULL);
sinkelement = GST_PAD_PARENT (sinkpad);
g_return_if_fail (sinkelement != NULL);
GST_INFO ("have pad linked callback on %s:%s to %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
GST_DEBUG ("srcpad sched is %p, sinkpad sched is %p",
GST_ELEMENT_SCHED (srcelement), GST_ELEMENT_SCHED (sinkelement));
gst_basic_scheduler_chain_elements (bsched, srcelement, sinkelement);
}
static void
gst_basic_scheduler_pad_unlink (GstScheduler * sched, GstPad * srcpad,
GstPad * sinkpad)
{
GstElement *element1, *element2;
GstSchedulerChain *chain1, *chain2;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
GST_INFO ("unlinking pads %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
/* we need to have the parent elements of each pad */
element1 = GST_ELEMENT (GST_PAD_PARENT (srcpad));
element2 = GST_ELEMENT (GST_PAD_PARENT (sinkpad));
/* first task is to remove the old chain they belonged to.
* this can be accomplished by taking either of the elements,
* since they are guaranteed to be in the same chain
* FIXME is it potentially better to make an attempt at splitting cleaner??
*/
chain1 = gst_basic_scheduler_find_chain (bsched, element1);
chain2 = gst_basic_scheduler_find_chain (bsched, element2);
/* FIXME: The old code still works in most cases, but does not deal with
* the problem of screwed up sched chains in some autoplugging cases.
* The new code has an infinite recursion bug during pipeline shutdown,
* which must be fixed before it can be enabled again.
*/
#if 1
if (chain1 != chain2) {
/* elements not in the same chain don't need to be separated */
GST_INFO ("elements not in the same chain");
return;
}
if (chain1) {
GST_INFO ("destroying chain");
gst_basic_scheduler_chain_destroy (chain1);
/* now create a new chain to hold element1 and build it from scratch */
chain1 = gst_basic_scheduler_chain_new (bsched);
gst_basic_scheduler_chain_recursive_add (chain1, element1, FALSE);
}
/* check the other element to see if it landed in the newly created chain */
if (gst_basic_scheduler_find_chain (bsched, element2) == NULL) {
/* if not in chain, create chain and build from scratch */
chain2 = gst_basic_scheduler_chain_new (bsched);
gst_basic_scheduler_chain_recursive_add (chain2, element2, FALSE);
}
#else
/* if they're both in the same chain, move second set of elements to a new chain */
if (chain1 && (chain1 == chain2)) {
GST_INFO ("creating new chain for second element and peers");
chain2 = gst_basic_scheduler_chain_new (bsched);
gst_basic_scheduler_chain_recursive_add (chain2, element2, TRUE);
}
#endif
}
static GstData *
gst_basic_scheduler_pad_select (GstScheduler * sched, GstPad ** selected,
GstPad ** padlist)
{
GstData *data = NULL;
gint i = 0;
GST_INFO ("performing select");
while (padlist[i]) {
GstPad *pad = padlist[i];
GST_RPAD_CHAINHANDLER (pad) =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_select_proxy);
}
do_element_switch (GST_PAD_PARENT (GST_PAD_PEER (padlist[0])));
i = 0;
while (padlist[i]) {
GstPad *pad = padlist[i];
if (GST_RPAD_BUFPEN (pad)) {
*selected = pad;
data = GST_RPAD_BUFPEN (pad);
GST_RPAD_BUFPEN (pad) = NULL;
}
GST_RPAD_CHAINHANDLER (pad) =
GST_DEBUG_FUNCPTR (gst_basic_scheduler_chainhandler_proxy);
}
g_assert (data != NULL);
return data;
}
static GstSchedulerState
gst_basic_scheduler_iterate (GstScheduler * sched)
{
GList *chains;
GstSchedulerChain *chain;
GstElement *entry;
GList *elements;
gint scheduled = 0;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
GST_CAT_LOG_OBJECT (debug_dataflow, sched,
"starting iteration in bin %s", GST_ELEMENT_NAME (sched->parent));
/* clear the changes flag */
GST_FLAG_UNSET (bsched, GST_BASIC_SCHEDULER_CHANGE);
/* step through all the chains */
chains = bsched->chains;
if (chains == NULL)
return GST_SCHEDULER_STATE_STOPPED;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
/* all we really have to do is switch to the first child */
/* FIXME this should be lots more intelligent about where to start */
GST_CAT_DEBUG (debug_dataflow,
"starting iteration via cothreads using %s scheduler", _SCHEDULER_NAME);
if (chain->elements) {
entry = NULL; /*MattH ADDED? */
GST_DEBUG ("there are %d elements in this chain", chain->num_elements);
elements = chain->elements;
while (elements) {
entry = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
if (GST_FLAG_IS_SET (entry, GST_ELEMENT_DECOUPLED)) {
GST_DEBUG ("entry \"%s\" is DECOUPLED, skipping",
GST_ELEMENT_NAME (entry));
entry = NULL;
} else if (GST_FLAG_IS_SET (entry, GST_ELEMENT_INFINITE_LOOP)) {
GST_DEBUG ("entry \"%s\" is not valid, skipping",
GST_ELEMENT_NAME (entry));
entry = NULL;
} else
break;
}
if (entry) {
GstSchedulerState state;
GST_FLAG_SET (entry, GST_ELEMENT_COTHREAD_STOPPING);
GST_CAT_DEBUG (debug_dataflow,
"set COTHREAD_STOPPING flag on \"%s\"(@%p)",
GST_ELEMENT_NAME (entry), entry);
if (GST_ELEMENT_THREADSTATE (entry)) {
do_switch_from_main (entry);
state = GST_SCHEDULER_STATE (sched);
/* if something changed, return - go on else */
if (GST_FLAG_IS_SET (bsched, GST_BASIC_SCHEDULER_CHANGE) &&
state != GST_SCHEDULER_STATE_ERROR)
return GST_SCHEDULER_STATE_RUNNING;
} else {
GST_CAT_DEBUG (debug_dataflow,
"cothread switch not possible, element has no threadstate");
return GST_SCHEDULER_STATE_ERROR;
}
/* following is a check to see if the chain was interrupted due to a
* top-half state_change(). (i.e., if there's a pending state.)
*
* if it was, return to gstthread.c::gst_thread_main_loop() to
* execute the state change.
*/
GST_CAT_DEBUG (debug_dataflow, "cothread switch ended or interrupted");
if (state != GST_SCHEDULER_STATE_RUNNING) {
GST_CAT_INFO (debug_dataflow, "scheduler is not running, in state %d",
state);
return state;
}
scheduled++;
} else {
GST_CAT_INFO (debug_dataflow,
"no entry in this chain, trying the next one");
}
} else {
GST_CAT_INFO (debug_dataflow,
"no enabled elements in this chain, trying the next one");
}
}
GST_CAT_LOG_OBJECT (debug_dataflow, sched, "leaving (%s)",
GST_ELEMENT_NAME (sched->parent));
if (scheduled == 0) {
GST_CAT_INFO (debug_dataflow, "nothing was scheduled, return STOPPED");
return GST_SCHEDULER_STATE_STOPPED;
} else {
GST_CAT_INFO (debug_dataflow, "scheduler still running, return RUNNING");
return GST_SCHEDULER_STATE_RUNNING;
}
}
static void
gst_basic_scheduler_show (GstScheduler * sched)
{
GList *chains, *elements;
GstElement *element;
GstSchedulerChain *chain;
GstBasicScheduler *bsched = GST_BASIC_SCHEDULER (sched);
if (sched == NULL) {
g_print ("scheduler doesn't exist for this element\n");
return;
}
g_return_if_fail (GST_IS_SCHEDULER (sched));
g_print ("SCHEDULER DUMP FOR MANAGING BIN \"%s\"\n",
GST_ELEMENT_NAME (sched->parent));
g_print ("scheduler has %d elements in it: ", bsched->num_elements);
elements = bsched->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("%s, ", GST_ELEMENT_NAME (element));
}
g_print ("\n");
g_print ("scheduler has %d chains in it\n", bsched->num_chains);
chains = bsched->chains;
while (chains) {
chain = (GstSchedulerChain *) (chains->data);
chains = g_list_next (chains);
g_print ("%p: ", chain);
elements = chain->disabled;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("!%s, ", GST_ELEMENT_NAME (element));
}
elements = chain->elements;
while (elements) {
element = GST_ELEMENT (elements->data);
elements = g_list_next (elements);
g_print ("%s, ", GST_ELEMENT_NAME (element));
}
g_print ("\n");
}
}
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