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tracer: add element-change-state-pre/post hook

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Helps catching when a state change is starting and ending.

It is also possible to track the end of state changes by checking the
async-done or state-change messages.
This is particularly important for elements that do async state changes.
This commit is contained in:
Thiago Santos 2015-10-29 08:40:32 -03:00
parent b09e9592ec
commit 82c1ec4931
3 changed files with 26 additions and 3 deletions
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4
gst/gstelement.c
View file

@ -2620,12 +2620,16 @@ gst_element_change_state (GstElement * element, GstStateChange transition)
oclass = GST_ELEMENT_GET_CLASS (element);
GST_TRACER_ELEMENT_CHANGE_STATE_PRE (element, transition);
/* call the state change function so it can set the state */
if (oclass->change_state)
ret = (oclass->change_state) (element, transition);
else
ret = GST_STATE_CHANGE_FAILURE;
GST_TRACER_ELEMENT_CHANGE_STATE_POST (element, transition, ret);
switch (ret) {
case GST_STATE_CHANGE_FAILURE:
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,

7
gst/gsttracerutils.c
View file

@ -49,9 +49,10 @@ static const gchar *_quark_strings[] = {
"pad-push-event-post", "pad-query-pre", "pad-query-post",
"element-post-message-pre",
"element-post-message-post", "element-query-pre", "element-query-post",
"element-new", "element-add-pad", "element-remove-pad", "bin-add-pre",
"bin-add-post", "bin-remove-pre", "bin-remove-post", "pad-link-pre",
"pad-link-post", "pad-unlink-pre", "pad-unlink-post"
"element-new", "element-add-pad", "element-remove-pad",
"bin-add-pre", "bin-add-post", "bin-remove-pre", "bin-remove-post",
"pad-link-pre", "pad-link-post", "pad-unlink-pre", "pad-unlink-post",
"element-change-state-pre", "element-change-state-post"
};
GQuark _priv_gst_tracer_quark_table[GST_TRACER_QUARK_MAX];

18
gst/gsttracerutils.h
View file

@ -68,6 +68,8 @@ typedef enum /*< skip >*/
GST_TRACER_QUARK_HOOK_PAD_LINK_POST,
GST_TRACER_QUARK_HOOK_PAD_UNLINK_PRE,
GST_TRACER_QUARK_HOOK_PAD_UNLINK_POST,
GST_TRACER_QUARK_HOOK_ELEMENT_CHANGE_STATE_PRE,
GST_TRACER_QUARK_HOOK_ELEMENT_CHANGE_STATE_POST,
GST_TRACER_QUARK_MAX
} GstTracerQuarkId;
@ -231,6 +233,20 @@ typedef void (*GstTracerHookElementRemovePad) (GObject *, GstClockTime,
GstTracerHookElementRemovePad, (GST_TRACER_ARGS, element, pad)); \
}G_STMT_END
typedef void (*GstTracerHookElementChangeStatePre) (GObject *, GstClockTime,
GstElement *, GstStateChange);
#define GST_TRACER_ELEMENT_CHANGE_STATE_PRE(element, transition) G_STMT_START{ \
GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_CHANGE_STATE_PRE), \
GstTracerHookElementChangeStatePre, (GST_TRACER_ARGS, element, transition)); \
}G_STMT_END
typedef void (*GstTracerHookElementChangeStatePost) (GObject *, GstClockTime,
GstElement *, GstStateChange, GstStateChangeReturn);
#define GST_TRACER_ELEMENT_CHANGE_STATE_POST(element, transition, result) G_STMT_START{ \
GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_CHANGE_STATE_POST), \
GstTracerHookElementChangeStatePost, (GST_TRACER_ARGS, element, transition, result)); \
}G_STMT_END
typedef void (*GstTracerHookBinAddPre) (GObject *, GstClockTime,
GstBin *, GstElement *);
#define GST_TRACER_BIN_ADD_PRE(bin, element) G_STMT_START{ \
@ -306,6 +322,8 @@ typedef void (*GstTracerHookPadUnlinkPost) (GObject *, GstClockTime,
#define GST_TRACER_ELEMENT_NEW(element)
#define GST_TRACER_ELEMENT_ADD_PAD(element, pad)
#define GST_TRACER_ELEMENT_REMOVE_PAD(element, pad)
#define GST_TRACER_ELEMENT_CHANGE_STATE_PRE(element, transition)
#define GST_TRACER_ELEMENT_CHANGE_STATE_POST(element, transition, res)
#define GST_TRACER_BIN_ADD_PRE(bin, element)
#define GST_TRACER_BIN_ADD_POST(bin, element, res)
#define GST_TRACER_BIN_REMOVE_PRE(bin, element)