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Potential GstContext regression

Browse source 
Since the refactoring of GstContext (commits
qc9fa2771b508e9aaeecc700e66e958190476f,
a7f5dc8b8a,
690326f906dc82e41ea58b81cdb2e3e88b754,
d367dc1b0d4ecb37f4d27267e03d7bf0c6c06a6, and
82d158aed3f2e8545e1e7d35085085ff58f18) I am no longer able to get
a shared context for an element that is used twice in a pipeline.

I used the documentation and eglglessink as my reference for
implementing the GstContext logic.

As the code was tied to a hardware decoder, I have ported the
GstContext code to fakesink to show the problem. Using the old
API a single ExampleMgr instance is created, but using the new
API each element is creating its own instance.
This commit is contained in:
Alex Ashley 2013-09-24 10:29:06 +01:00 committed by Sebastian Dröge
parent 20f1c96c89
commit e658379534
2 changed files with 264 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

232
plugins/elements/gstfakesink.c
View file

@ -136,6 +136,10 @@ static guint gst_fake_sink_signals[LAST_SIGNAL] = { 0 };
static GParamSpec *pspec_last_message = NULL;
static GstExampleMgr *gst_example_mgr_singleton = NULL;
static void gst_fake_sink_set_context (GstElement * element,
GstContext * context);
static void
gst_fake_sink_class_init (GstFakeSinkClass * klass)
{
@ -226,6 +230,7 @@ gst_fake_sink_class_init (GstFakeSinkClass * klass)
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_fake_sink_change_state);
gstelement_class->set_context = GST_DEBUG_FUNCPTR (gst_fake_sink_set_context);
gstbase_sink_class->event = GST_DEBUG_FUNCPTR (gst_fake_sink_event);
gstbase_sink_class->preroll = GST_DEBUG_FUNCPTR (gst_fake_sink_preroll);
@ -242,6 +247,7 @@ gst_fake_sink_init (GstFakeSink * fakesink)
fakesink->state_error = DEFAULT_STATE_ERROR;
fakesink->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
fakesink->num_buffers = DEFAULT_NUM_BUFFERS;
fakesink->example_mgr = NULL;
gst_base_sink_set_sync (GST_BASE_SINK (fakesink), DEFAULT_SYNC);
}
@ -513,6 +519,7 @@ static gboolean
gst_fake_sink_query (GstBaseSink * bsink, GstQuery * query)
{
gboolean ret;
GstFakeSink *fakesink = GST_FAKE_SINK_CAST (bsink);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_SEEKING:{
@ -524,6 +531,31 @@ gst_fake_sink_query (GstBaseSink * bsink, GstQuery * query)
ret = TRUE;
break;
}
case GST_QUERY_CONTEXT:{
const gchar *context_type = NULL;
gst_query_parse_context_type (query, &context_type);
GST_DEBUG_OBJECT (fakesink, "query context %s %u", context_type,
(guint) fakesink->example_mgr);
if (g_strcmp0 (context_type, GST_EXAMPLE_MGR_CONTEXT_TYPE) == 0 &&
fakesink->example_mgr) {
GstContext *context, *old_context = NULL;
GST_DEBUG_OBJECT (fakesink, "GST_EXAMPLE_MGR query reply %u",
(guint) fakesink->example_mgr);
gst_query_parse_context (query, &old_context);
if (old_context) {
context = gst_context_copy (old_context);
g_assert (context != NULL);
gst_context_set_example_mgr (context, fakesink->example_mgr);
} else {
context = gst_example_mgr_new_context (fakesink->example_mgr);
}
gst_query_set_context (query, context);
gst_context_unref (context);
return TRUE;
}
ret = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
default:
ret = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
@ -540,8 +572,79 @@ gst_fake_sink_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
GST_DEBUG_OBJECT (fakesink, "GST_STATE_CHANGE_NULL_TO_READY");
if (fakesink->state_error == FAKE_SINK_STATE_ERROR_NULL_READY)
goto error;
GST_OBJECT_LOCK (fakesink);
if (!fakesink->example_mgr) { /* Query upstream for the context */
GstPad *sinkPad = GST_BASE_SINK_PAD (fakesink);
GST_DEBUG_OBJECT (fakesink, "Need to find or create an ExampleMgr %u",
(guint) gst_example_mgr_singleton);
if (sinkPad) {
GstQuery *query = gst_example_mgr_query_context ();
GstContext *context = NULL;
GST_DEBUG_OBJECT (fakesink, "Query upstream for ExampleMgr");
GST_OBJECT_UNLOCK (fakesink);
gst_pad_query (sinkPad, query);
GST_OBJECT_LOCK (fakesink);
gst_query_parse_context (query, &context);
if (context) {
GstExampleMgr *mgr = NULL;
GST_DEBUG_OBJECT (fakesink, "Query upstream got context");
if (gst_context_get_example_mgr (context, &mgr)) {
GST_DEBUG_OBJECT (fakesink,
"Query upstream found ExampleMgr %u", (guint) mgr);
if (fakesink->example_mgr) {
gst_example_mgr_unref (fakesink->example_mgr);
}
fakesink->example_mgr = mgr;
}
}
gst_query_unref (query);
}
}
if (!fakesink->example_mgr) {
GstMessage *msg;
/* Query downstream for the context */
/*Post a message in the bus to see if the application has one to share. */
GST_DEBUG_OBJECT (fakesink, "Post message to look for ExampleMgr");
msg = gst_message_new_need_context (GST_OBJECT_CAST (fakesink),
GST_EXAMPLE_MGR_CONTEXT_TYPE);
GST_OBJECT_UNLOCK (fakesink);
gst_element_post_message (GST_ELEMENT_CAST (fakesink), msg);
GST_OBJECT_LOCK (fakesink);
}
if (fakesink->example_mgr) {
GST_OBJECT_UNLOCK (fakesink);
} else {
fakesink->example_mgr = gst_example_mgr_new (NULL);
GST_OBJECT_UNLOCK (fakesink);
if (gst_example_mgr_singleton != fakesink->example_mgr) {
GST_ERROR_OBJECT (fakesink,
"More than one ExampleMgr has been allocated!");
goto error;
}
if (!fakesink->example_mgr) {
GST_ERROR_OBJECT (fakesink, "Could not create GstExampleManager");
goto error;
} else {
GstMessage *msg;
GstContext *context;
/* Create the context if there is none, post a message and
send an event letting everyone know that the element
has the context. */
context = gst_example_mgr_new_context (fakesink->example_mgr);
GST_DEBUG_OBJECT (fakesink,
"telling the world about the new ExampleMgr %u",
(guint) fakesink->example_mgr);
gst_element_set_context (GST_ELEMENT_CAST (fakesink), context);
msg = gst_message_new_have_context (GST_OBJECT (fakesink), context);
gst_element_post_message (GST_ELEMENT_CAST (fakesink), msg);
context = gst_example_mgr_new_context (fakesink->example_mgr);
GST_DEBUG_OBJECT (fakesink,
"telling the world about the new ExampleMgr done");
}
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (fakesink->state_error == FAKE_SINK_STATE_ERROR_READY_PAUSED)
@ -573,6 +676,10 @@ gst_fake_sink_change_state (GstElement * element, GstStateChange transition)
GST_OBJECT_LOCK (fakesink);
g_free (fakesink->last_message);
fakesink->last_message = NULL;
if (fakesink->example_mgr) {
gst_example_mgr_unref (fakesink->example_mgr);
fakesink->example_mgr = NULL;
}
GST_OBJECT_UNLOCK (fakesink);
break;
default:
@ -587,3 +694,128 @@ error:
("Erroring out on state change as requested"));
return GST_STATE_CHANGE_FAILURE;
}
static void
gst_fake_sink_set_context (GstElement * element, GstContext * context)
{
GstExampleMgr *mgr = NULL;
GstFakeSink *fakesink = GST_FAKE_SINK (element);
GST_DEBUG_OBJECT (fakesink, "set context");
if (gst_context_get_example_mgr (context, &mgr)) {
GST_OBJECT_LOCK (fakesink);
GST_DEBUG_OBJECT (fakesink, "ExampleMgr %u", (guint) mgr);
if (fakesink->example_mgr) {
gst_example_mgr_unref (fakesink->example_mgr);
}
fakesink->example_mgr = mgr;
GST_OBJECT_UNLOCK (fakesink);
}
/* GstElement no longer keeps context
GST_OBJECT_LOCK (fakesink);
context = gst_context_copy (context);
gst_context_set_example_mgr (context, fakesink->example_mgr);
GST_OBJECT_UNLOCK (fakesink);
GST_ELEMENT_CLASS (gst_example_sink_parent_class)->set_context (element, context);
gst_context_unref (context);
*/
}
struct _GstExampleMgr
{
volatile gint refcount;
GDestroyNotify destroy_notify;
};
GstExampleMgr *
gst_example_mgr_new (GDestroyNotify destroy_notify)
{
GstExampleMgr *mgr;
mgr = g_slice_new (GstExampleMgr);
GST_DEBUG ("new ExampleMgr %u", (guint) mgr);
mgr->refcount = 1;
mgr->destroy_notify = destroy_notify;
if (gst_example_mgr_singleton == NULL) {
gst_example_mgr_singleton = mgr;
}
return mgr;
}
GstExampleMgr *
gst_example_mgr_ref (GstExampleMgr * mgr)
{
g_return_val_if_fail (mgr != NULL, NULL);
g_atomic_int_inc (&mgr->refcount);
GST_DEBUG ("ref %u %d", (guint) mgr, mgr->refcount);
return mgr;
}
void
gst_example_mgr_unref (GstExampleMgr * mgr)
{
g_return_if_fail (mgr != NULL);
GST_DEBUG ("unref %u %d", (guint) mgr, mgr->refcount);
if (g_atomic_int_dec_and_test (&mgr->refcount)) {
GST_DEBUG ("refcount==0");
if (mgr->destroy_notify) {
mgr->destroy_notify (mgr);
}
if (gst_example_mgr_singleton == mgr) {
gst_example_mgr_singleton = NULL;
}
g_slice_free (GstExampleMgr, mgr);
}
}
#define GST_EXAMPLE_MGR_CONTEXT_NAME "ExampleMgr"
gboolean
gst_context_get_example_mgr (GstContext * context, GstExampleMgr ** mgr)
{
const GstStructure *s;
g_return_val_if_fail (GST_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (strcmp (gst_context_get_context_type (context),
GST_EXAMPLE_MGR_CONTEXT_TYPE) == 0, FALSE);
s = gst_context_get_structure (context);
return gst_structure_get (s, GST_EXAMPLE_MGR_CONTEXT_NAME,
GST_TYPE_EXAMPLE_MGR, mgr, NULL);
}
GstContext *
gst_example_mgr_new_context (GstExampleMgr * mgr)
{
GstContext *context;
context = gst_context_new (GST_EXAMPLE_MGR_CONTEXT_TYPE, FALSE);
if (context) {
gst_context_set_example_mgr (context, mgr);
}
return context;
}
GstQuery *
gst_example_mgr_query_context (void)
{
GstQuery *context = gst_query_new_context (GST_EXAMPLE_MGR_CONTEXT_TYPE);
return context;
}
void
gst_context_set_example_mgr (GstContext * context, GstExampleMgr * mgr)
{
GstStructure *s;
if (context && mgr) {
s = gst_context_writable_structure (context);
gst_structure_set (s, GST_EXAMPLE_MGR_CONTEXT_NAME,
GST_TYPE_EXAMPLE_MGR, mgr, NULL);
}
}
G_DEFINE_BOXED_TYPE (GstExampleMgr, gst_example_mgr,
(GBoxedCopyFunc) gst_example_mgr_ref,
(GBoxedFreeFunc) gst_example_mgr_unref);

48
plugins/elements/gstfakesink.h
View file

@ -28,8 +28,6 @@
#include <gst/base/gstbasesink.h>
G_BEGIN_DECLS
#define GST_TYPE_FAKE_SINK \
(gst_fake_sink_get_type())
#define GST_FAKE_SINK(obj) \
@ -41,7 +39,6 @@ G_BEGIN_DECLS
#define GST_IS_FAKE_SINK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FAKE_SINK))
#define GST_FAKE_SINK_CAST(obj) ((GstFakeSink *)obj)
/**
* GstFakeSinkStateError:
* @FAKE_SINK_STATE_ERROR_NONE: no error
@ -54,7 +51,8 @@ G_BEGIN_DECLS
*
* Possible state change errors for the state-error property.
*/
typedef enum {
typedef enum
{
FAKE_SINK_STATE_ERROR_NONE = 0,
FAKE_SINK_STATE_ERROR_NULL_READY,
FAKE_SINK_STATE_ERROR_READY_PAUSED,
@ -66,34 +64,52 @@ typedef enum {
typedef struct _GstFakeSink GstFakeSink;
typedef struct _GstFakeSinkClass GstFakeSinkClass;
typedef struct _GstExampleMgr GstExampleMgr;
/**
* GstFakeSink:
*
* The opaque #GstFakeSink data structure.
*/
struct _GstFakeSink {
GstBaseSink element;
struct _GstFakeSink
{
GstBaseSink element;
gboolean silent;
gboolean dump;
gboolean signal_handoffs;
gboolean silent;
gboolean dump;
gboolean signal_handoffs;
GstFakeSinkStateError state_error;
gchar *last_message;
gint num_buffers;
gint num_buffers_left;
gchar *last_message;
gint num_buffers;
gint num_buffers_left;
GstExampleMgr *example_mgr;
};
struct _GstFakeSinkClass {
struct _GstFakeSinkClass
{
GstBaseSinkClass parent_class;
/* signals */
void (*handoff) (GstElement *element, GstBuffer *buf, GstPad *pad);
void (*preroll_handoff) (GstElement *element, GstBuffer *buf, GstPad *pad);
void (*handoff) (GstElement * element, GstBuffer * buf, GstPad * pad);
void (*preroll_handoff) (GstElement * element, GstBuffer * buf, GstPad * pad);
};
G_GNUC_INTERNAL GType gst_fake_sink_get_type (void);
G_END_DECLS
#define GST_EXAMPLE_MGR_CONTEXT_TYPE "gst.example.ExampleMgr"
GstContext *gst_example_mgr_new_context (GstExampleMgr * mgr);
GstQuery *gst_example_mgr_query_context (void);
void gst_context_set_example_mgr (GstContext * context, GstExampleMgr * mgr);
gboolean gst_context_get_example_mgr (GstContext * context,
GstExampleMgr ** mgr);
#define GST_TYPE_EXAMPLE_MGR (gst_example_mgr_get_type())
GType gst_example_mgr_get_type (void);
GstExampleMgr *gst_example_mgr_new (GDestroyNotify destroy_notify);
GstExampleMgr *gst_example_mgr_ref (GstExampleMgr * mgr);
void gst_example_mgr_unref (GstExampleMgr * mgr);
G_END_DECLS
#endif /* __GST_FAKE_SINK_H__ */