tracers: eliminate var_args

Register tracer hooks as GCallback. Use macros for hook dispatch and cast the
hook functions back to the appropriate type.

7 files changed, 184 insertions, 215 deletions

diff --git a/gst/gsttracer.h b/gst/gsttracer.h
index 489dd016d..015df278c 100644
--- a/gst/gsttracer.h
+++ b/gst/gsttracer.h
@@ -53,8 +53,6 @@ struct _GstTracer {
   gpointer _gst_reserved[GST_PADDING];
 };
 
-typedef void (*GstTracerHookFunction) (GstTracer * self, va_list var_args);
-
 struct _GstTracerClass {
   GstObjectClass parent_class;
     
@@ -65,9 +63,9 @@ struct _GstTracerClass {
 GType gst_tracer_get_type          (void);
 
 void gst_tracer_register_hook (GstTracer *tracer, const gchar *detail, 
-  GstTracerHookFunction func);
+  GCallback func);
 void gst_tracer_register_hook_id (GstTracer *tracer, GQuark detail, 
-  GstTracerHookFunction func);
+  GCallback func);
 
 void gst_tracer_log_trace (GstStructure * s);
 
diff --git a/gst/gsttracerutils.c b/gst/gsttracerutils.c
index 5b617307a..af5c39383 100644
--- a/gst/gsttracerutils.c
+++ b/gst/gsttracerutils.c
@@ -57,12 +57,6 @@ GQuark _priv_gst_tracer_quark_table[GST_TRACER_QUARK_MAX];
 gboolean _priv_tracer_enabled = FALSE;
 GHashTable *_priv_tracers = NULL;
 
-typedef struct
-{
-  GstTracer *tracer;
-  GstTracerHookFunction func;
-} GstTracerHook;
-
 /* Initialize the tracing system */
 void
 _priv_gst_tracer_init (void)
@@ -153,8 +147,7 @@ _priv_gst_tracer_deinit (void)
 }
 
 void
-gst_tracer_register_hook_id (GstTracer * tracer, GQuark detail,
-    GstTracerHookFunction func)
+gst_tracer_register_hook_id (GstTracer * tracer, GQuark detail, GCallback func)
 {
   gpointer key = GINT_TO_POINTER (detail);
   GList *list = g_hash_table_lookup (_priv_tracers, key);
@@ -171,36 +164,9 @@ gst_tracer_register_hook_id (GstTracer * tracer, GQuark detail,
 
 void
 gst_tracer_register_hook (GstTracer * tracer, const gchar * detail,
-    GstTracerHookFunction func)
+    GCallback func)
 {
   gst_tracer_register_hook_id (tracer, g_quark_try_string (detail), func);
 }
 
-void
-gst_tracer_dispatch (GQuark detail, ...)
-{
-  va_list var_args;
-  gpointer key = GINT_TO_POINTER (detail);
-  GList *list, *node;
-  GstTracerHook *hook;
-
-  list = g_hash_table_lookup (_priv_tracers, key);
-  GST_DEBUG ("calling %d tracers for '%s'", g_list_length (list),
-      g_quark_to_string (detail));
-  for (node = list; node; node = g_list_next (node)) {
-    hook = (GstTracerHook *) node->data;
-    va_start (var_args, detail);
-    hook->func (hook->tracer, var_args);
-    va_end (var_args);
-  }
-  list = g_hash_table_lookup (_priv_tracers, NULL);
-  GST_DEBUG ("calling %d tracers for '*'", g_list_length (list));
-  for (node = list; node; node = g_list_next (node)) {
-    hook = (GstTracerHook *) node->data;
-    va_start (var_args, detail);
-    hook->func (hook->tracer, var_args);
-    va_end (var_args);
-  }
-}
-
 #endif /* GST_DISABLE_GST_DEBUG */
diff --git a/gst/gsttracerutils.h b/gst/gsttracerutils.h
index b3edc6688..02f9ef7d2 100644
--- a/gst/gsttracerutils.h
+++ b/gst/gsttracerutils.h
@@ -41,10 +41,6 @@ void _priv_gst_tracer_deinit (void);
 
 gboolean gst_tracer_register (GstPlugin * plugin, const gchar * name, GType type);
 
-/* tracing helpers */
-
-void gst_tracer_dispatch (GQuark detail, ...);
-
 /* tracer quarks */
 
 /* These enums need to match the number and order
@@ -72,112 +68,123 @@ extern GQuark _priv_gst_tracer_quark_table[GST_TRACER_QUARK_MAX];
 
 /* tracing module helpers */
 
+typedef struct {
+  GObject *tracer;
+  GCallback func;
+} GstTracerHook;
+
 extern gboolean _priv_tracer_enabled;
-extern GHashTable *_priv_tracers;
+/* key are hook-id quarks, values are GstTracerHook */
+extern GHashTable *_priv_tracers; 
 
-#define GST_TRACER_IS_ENABLED(id) \
-  (_priv_tracer_enabled && \
-      (g_hash_table_contains (_priv_tracers, GINT_TO_POINTER(id))))
+#define GST_TRACER_IS_ENABLED (_priv_tracer_enabled)
 
 #define GST_TRACER_TS \
   GST_CLOCK_DIFF (_priv_gst_info_start_time, gst_util_get_timestamp ())
 
 /* tracing hooks */
 
+#define GST_TRACER_ARGS h->tracer, ts
+#define GST_TRACER_DISPATCH(key,type,args) G_STMT_START{ \
+  if (GST_TRACER_IS_ENABLED) {                                         \
+    GstClockTime ts = GST_TRACER_TS;                                   \
+    GList *__l, *__n;                                                  \
+    GstTracerHook *h;                                                  \
+    __l = g_hash_table_lookup (_priv_tracers, GINT_TO_POINTER (key));  \
+    for (__n = __l; __n; __n = g_list_next (__n)) {                    \
+      h = (GstTracerHook *) __n->data;                                 \
+      ((type)(h->func)) args;                                          \
+    }                                                                  \
+    __l = g_hash_table_lookup (_priv_tracers, NULL);                   \
+    for (__n = __l; __n; __n = g_list_next (__n)) {                    \
+      h = (GstTracerHook *) __n->data;                                 \
+      ((type)(h->func)) args;                                          \
+    }                                                                  \
+  }                                                                    \
+}G_STMT_END
+
+typedef void (*GstTracerHookPadPushPre) (GObject *, GstClockTime, GstPad *, 
+    GstBuffer *);
 #define GST_TRACER_PAD_PUSH_PRE(pad, buffer) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_PRE), \
-        GST_TRACER_TS, \
-        pad, buffer); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_PRE), \
+    GstTracerHookPadPushPre, (GST_TRACER_ARGS, pad, buffer)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPushPost) (GObject *, GstClockTime, GstPad *, 
+    GstFlowReturn);
 #define GST_TRACER_PAD_PUSH_POST(pad, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_POST), \
-        GST_TRACER_TS, \
-        pad, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_POST), \
+    GstTracerHookPadPushPost, (GST_TRACER_ARGS, pad, res)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPushListPre) (GObject *, GstClockTime, GstPad *, 
+    GstBufferList *);
 #define GST_TRACER_PAD_PUSH_LIST_PRE(pad, list) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_PRE), \
-        GST_TRACER_TS, \
-        pad, list); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_PRE), \
+    GstTracerHookPadPushListPre, (GST_TRACER_ARGS, pad, list)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPushListPost) (GObject *, GstClockTime, GstPad *, 
+    GstFlowReturn);
 #define GST_TRACER_PAD_PUSH_LIST_POST(pad, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_POST), \
-        GST_TRACER_TS, \
-        pad, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_POST), \
+    GstTracerHookPadPushListPost, (GST_TRACER_ARGS, pad, res)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPullRangePre) (GObject *, GstClockTime, GstPad *, 
+    guint64, guint);
 #define GST_TRACER_PAD_PULL_RANGE_PRE(pad, offset, size) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_PRE), \
-        GST_TRACER_TS, \
-        pad, offset, size); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_PRE), \
+    GstTracerHookPadPullRangePre, (GST_TRACER_ARGS, pad, offset, size)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPullRangePost) (GObject *, GstClockTime,
+    GstPad *, GstBuffer *, GstFlowReturn);
 #define GST_TRACER_PAD_PULL_RANGE_POST(pad, buffer, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_POST), \
-        GST_TRACER_TS, \
-        pad, buffer, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_POST), \
+    GstTracerHookPadPullRangePost, (GST_TRACER_ARGS, pad, buffer, res)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPushEventPre) (GObject *, GstClockTime, GstPad *, 
+    GstEvent *);
 #define GST_TRACER_PAD_PUSH_EVENT_PRE(pad, event) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_PRE), \
-        GST_TRACER_TS, \
-        pad, event); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_PRE), \
+    GstTracerHookPadPushEventPre, (GST_TRACER_ARGS, pad, event)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookPadPushEventPost) (GObject *, GstClockTime, 
+    GstPad *, gboolean);
 #define GST_TRACER_PAD_PUSH_EVENT_POST(pad, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_POST), \
-        GST_TRACER_TS, \
-        pad, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_POST), \
+    GstTracerHookPadPushEventPost, (GST_TRACER_ARGS, pad, res)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookElementPostMessagePre) (GObject *, GstClockTime,
+    GstElement *, GstMessage *);
 #define GST_TRACER_ELEMENT_POST_MESSAGE_PRE(element, message) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_PRE), \
-        GST_TRACER_TS, \
-        element, message); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_PRE), \
+    GstTracerHookElementPostMessagePre, (GST_TRACER_ARGS, element, message)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookElementPostMessagePost) (GObject *, GstClockTime,
+    GstElement *, gboolean);
 #define GST_TRACER_ELEMENT_POST_MESSAGE_POST(element, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_POST), \
-        GST_TRACER_TS, \
-        element, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_POST), \
+    GstTracerHookElementPostMessagePost, (GST_TRACER_ARGS, element, res)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookElementQueryPre) (GObject *, GstClockTime,
+    GstElement *, GstQuery *);
 #define GST_TRACER_ELEMENT_QUERY_PRE(element, query) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_PRE))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_PRE), \
-        GST_TRACER_TS, \
-        element, query); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_PRE), \
+    GstTracerHookElementQueryPre, (GST_TRACER_ARGS, element, query)); \
 }G_STMT_END
 
+typedef void (*GstTracerHookElementQueryPost) (GObject *, GstClockTime,
+    GstElement *, gboolean);
 #define GST_TRACER_ELEMENT_QUERY_POST(element, res) G_STMT_START{ \
-  if (GST_TRACER_IS_ENABLED(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_POST))) { \
-    gst_tracer_dispatch (GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_POST), \
-        GST_TRACER_TS, \
-        element, res); \
-  } \
+  GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_POST), \
+    GstTracerHookElementQueryPost, (GST_TRACER_ARGS, element, res)); \
 }G_STMT_END
 
 #else /* !GST_DISABLE_GST_DEBUG */
diff --git a/plugins/tracers/gstlatency.c b/plugins/tracers/gstlatency.c
index 9ecf954fd..7f3101c1c 100644
--- a/plugins/tracers/gstlatency.c
+++ b/plugins/tracers/gstlatency.c
@@ -127,20 +127,16 @@ send_latency_probe (GstElement * parent, GstPad * pad, guint64 ts)
 }
 
 static void
-do_push_buffer_pre (GstTracer * self, va_list var_args)
+do_push_buffer_pre (GstTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstElement *parent = get_real_pad_parent (pad);
 
   send_latency_probe (parent, pad, ts);
 }
 
 static void
-do_pull_range_pre (GstTracer * self, va_list var_args)
+do_pull_range_pre (GstTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstPad *peer_pad = GST_PAD_PEER (pad);
   GstElement *parent = get_real_pad_parent (peer_pad);
 
@@ -160,10 +156,8 @@ calculate_latency (GstElement * parent, GstPad * pad, guint64 ts)
 }
 
 static void
-do_push_buffer_post (GstTracer * self, va_list var_args)
+do_push_buffer_post (GstTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstPad *peer_pad = GST_PAD_PEER (pad);
   GstElement *parent = get_real_pad_parent (peer_pad);
 
@@ -171,21 +165,16 @@ do_push_buffer_post (GstTracer * self, va_list var_args)
 }
 
 static void
-do_pull_range_post (GstTracer * self, va_list var_args)
+do_pull_range_post (GstTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstElement *parent = get_real_pad_parent (pad);
 
   calculate_latency (parent, pad, ts);
 }
 
 static void
-do_push_event_pre (GstTracer * self, va_list var_args)
+do_push_event_pre (GstTracer * self, guint64 ts, GstPad * pad, GstEvent * ev)
 {
-  G_GNUC_UNUSED guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
-  GstEvent *ev = va_arg (var_args, GstEvent *);
   GstPad *peer_pad = GST_PAD_PEER (pad);
   GstElement *parent = get_real_pad_parent (peer_pad);
 
@@ -238,11 +227,18 @@ static void
 gst_latency_tracer_init (GstLatencyTracer * self)
 {
   GstTracer *tracer = GST_TRACER (self);
-  gst_tracer_register_hook (tracer, "pad-push-pre", do_push_buffer_pre);
-  gst_tracer_register_hook (tracer, "pad-push-list-pre", do_push_buffer_pre);
-  gst_tracer_register_hook (tracer, "pad-push-post", do_push_buffer_post);
-  gst_tracer_register_hook (tracer, "pad-push-list-post", do_push_buffer_post);
-  gst_tracer_register_hook (tracer, "pad-pull-range-pre", do_pull_range_pre);
-  gst_tracer_register_hook (tracer, "pad-pull-range-post", do_pull_range_post);
-  gst_tracer_register_hook (tracer, "pad-push-event-pre", do_push_event_pre);
+  gst_tracer_register_hook (tracer, "pad-push-pre",
+      G_CALLBACK (do_push_buffer_pre));
+  gst_tracer_register_hook (tracer, "pad-push-list-pre",
+      G_CALLBACK (do_push_buffer_pre));
+  gst_tracer_register_hook (tracer, "pad-push-post",
+      G_CALLBACK (do_push_buffer_post));
+  gst_tracer_register_hook (tracer, "pad-push-list-post",
+      G_CALLBACK (do_push_buffer_post));
+  gst_tracer_register_hook (tracer, "pad-pull-range-pre",
+      G_CALLBACK (do_pull_range_pre));
+  gst_tracer_register_hook (tracer, "pad-pull-range-post",
+      G_CALLBACK (do_pull_range_post));
+  gst_tracer_register_hook (tracer, "pad-push-event-pre",
+      G_CALLBACK (do_push_event_pre));
 }
diff --git a/plugins/tracers/gstlog.c b/plugins/tracers/gstlog.c
index 2e429dc42..39eabcb00 100644
--- a/plugins/tracers/gstlog.c
+++ b/plugins/tracers/gstlog.c
@@ -53,100 +53,113 @@ G_DEFINE_TYPE_WITH_CODE (GstLogTracer, gst_log_tracer, GST_TYPE_TRACER,
     _do_init);
 
 static void
-do_log (GstDebugCategory * cat, const char *format, va_list var_args)
+do_log (GstDebugCategory * cat, const char *fmt, ...)
 {
-  gst_debug_log_valist (cat, GST_LEVEL_TRACE, "", "", 0, NULL,
-      format, var_args);
+  va_list var_args;
+
+  va_start (var_args, fmt);
+  gst_debug_log_valist (cat, GST_LEVEL_TRACE, "", "", 0, NULL, fmt, var_args);
+  va_end (var_args);
 }
 
 static void
-do_push_buffer_pre (GstTracer * self, va_list var_args)
+do_push_buffer_pre (GstTracer * self, guint64 ts, GstPad * pad,
+    GstBuffer * buffer)
 {
   do_log (GST_CAT_BUFFER,
       "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", buffer=%" GST_PTR_FORMAT,
-      var_args);
+      ts, pad, buffer);
 }
 
 static void
-do_push_buffer_post (GstTracer * self, va_list var_args)
+do_push_buffer_post (GstTracer * self, guint64 ts, GstPad * pad,
+    GstFlowReturn res)
 {
   do_log (GST_CAT_BUFFER,
-      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", var_args);
+      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", ts, pad, res);
 }
 
 static void
-do_push_buffer_list_pre (GstTracer * self, va_list var_args)
+do_push_buffer_list_pre (GstTracer * self, guint64 ts, GstPad * pad,
+    GstBufferList * list)
 {
   do_log (GST_CAT_BUFFER_LIST,
-      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", list=%p", var_args);
+      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", list=%p", ts, pad, list);
 }
 
 static void
-do_push_buffer_list_post (GstTracer * self, va_list var_args)
+do_push_buffer_list_post (GstTracer * self, guint64 ts, GstPad * pad,
+    GstFlowReturn res)
 {
   do_log (GST_CAT_BUFFER_LIST,
-      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", var_args);
+      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", ts, pad, res);
 }
 
 static void
-do_pull_range_pre (GstTracer * self, va_list var_args)
+do_pull_range_pre (GstTracer * self, guint64 ts, GstPad * pad, guint64 offset,
+    guint size)
 {
   do_log (GST_CAT_BUFFER,
       "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", offset=%" G_GUINT64_FORMAT
-      ", size=%u", var_args);
+      ", size=%u", ts, pad, offset, size);
 }
 
 static void
-do_pull_range_post (GstTracer * self, va_list var_args)
+do_pull_range_post (GstTracer * self, guint64 ts, GstPad * pad,
+    GstBuffer * buffer, GstFlowReturn res)
 {
   do_log (GST_CAT_BUFFER,
       "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", buffer=%" GST_PTR_FORMAT
-      ", res=%d", var_args);
+      ", res=%d", ts, pad, buffer, res);
 }
 
 static void
-do_push_event_pre (GstTracer * self, va_list var_args)
+do_push_event_pre (GstTracer * self, guint64 ts, GstPad * pad, GstEvent * event)
 {
   do_log (GST_CAT_EVENT,
       "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", event=%" GST_PTR_FORMAT,
-      var_args);
+      ts, pad, event);
 }
 
 static void
-do_push_event_post (GstTracer * self, va_list var_args)
+do_push_event_post (GstTracer * self, guint64 ts, GstPad * pad, gboolean res)
 {
   do_log (GST_CAT_EVENT,
-      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", var_args);
+      "%" GST_TIME_FORMAT ", pad=%" GST_PTR_FORMAT ", res=%d", ts, pad, res);
 }
 
 static void
-do_post_message_pre (GstTracer * self, va_list var_args)
+do_post_message_pre (GstTracer * self, guint64 ts, GstElement * elem,
+    GstMessage * msg)
 {
   do_log (GST_CAT_EVENT,
       "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", message=%"
-      GST_PTR_FORMAT, var_args);
+      GST_PTR_FORMAT, ts, elem, msg);
 }
 
 static void
-do_post_message_post (GstTracer * self, va_list var_args)
+do_post_message_post (GstTracer * self, guint64 ts, GstElement * elem,
+    gboolean res)
 {
   do_log (GST_CAT_EVENT,
-      "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", res=%d", var_args);
+      "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", res=%d", ts, elem,
+      res);
 }
 
 static void
-do_query_pre (GstTracer * self, va_list var_args)
+do_query_pre (GstTracer * self, guint64 ts, GstElement * elem, GstQuery * query)
 {
   do_log (GST_CAT_QUERY,
       "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", query=%"
-      GST_PTR_FORMAT, var_args);
+      GST_PTR_FORMAT, ts, elem, query);
 }
 
 static void
-do_query_post (GstTracer * self, va_list var_args)
+do_query_post (GstTracer * self, guint64 ts, GstElement * elem, gboolean res)
 {
   do_log (GST_CAT_QUERY,
-      "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", res=%d", var_args);
+      "%" GST_TIME_FORMAT ", element=%" GST_PTR_FORMAT ", res=%d", ts, elem,
+      res);
 }
 
 
@@ -162,20 +175,28 @@ gst_log_tracer_init (GstLogTracer * self)
 {
   GstTracer *tracer = GST_TRACER (self);
 
-  gst_tracer_register_hook (tracer, "pad-push-pre", do_push_buffer_pre);
-  gst_tracer_register_hook (tracer, "pad-push-post", do_push_buffer_post);
+  gst_tracer_register_hook (tracer, "pad-push-pre",
+      G_CALLBACK (do_push_buffer_pre));
+  gst_tracer_register_hook (tracer, "pad-push-post",
+      G_CALLBACK (do_push_buffer_post));
   gst_tracer_register_hook (tracer, "pad-push-list-pre",
-      do_push_buffer_list_pre);
+      G_CALLBACK (do_push_buffer_list_pre));
   gst_tracer_register_hook (tracer, "pad-push-list-post",
-      do_push_buffer_list_post);
-  gst_tracer_register_hook (tracer, "pad-pull-range-pre", do_pull_range_pre);
-  gst_tracer_register_hook (tracer, "pad-pull-range-post", do_pull_range_post);
-  gst_tracer_register_hook (tracer, "pad-push-event-pre", do_push_event_pre);
-  gst_tracer_register_hook (tracer, "pad-push-event-post", do_push_event_post);
+      G_CALLBACK (do_push_buffer_list_post));
+  gst_tracer_register_hook (tracer, "pad-pull-range-pre",
+      G_CALLBACK (do_pull_range_pre));
+  gst_tracer_register_hook (tracer, "pad-pull-range-post",
+      G_CALLBACK (do_pull_range_post));
+  gst_tracer_register_hook (tracer, "pad-push-event-pre",
+      G_CALLBACK (do_push_event_pre));
+  gst_tracer_register_hook (tracer, "pad-push-event-post",
+      G_CALLBACK (do_push_event_post));
   gst_tracer_register_hook (tracer, "element-post-message-pre",
-      do_post_message_pre);
+      G_CALLBACK (do_post_message_pre));
   gst_tracer_register_hook (tracer, "element-post-message-post",
-      do_post_message_post);
-  gst_tracer_register_hook (tracer, "element-query-pre", do_query_pre);
-  gst_tracer_register_hook (tracer, "element-query-post", do_query_post);
+      G_CALLBACK (do_post_message_post));
+  gst_tracer_register_hook (tracer, "element-query-pre",
+      G_CALLBACK (do_query_pre));
+  gst_tracer_register_hook (tracer, "element-query-post",
+      G_CALLBACK (do_query_post));
 }
diff --git a/plugins/tracers/gstrusage.c b/plugins/tracers/gstrusage.c
index 9a81ee1cb..be10ccc4b 100644
--- a/plugins/tracers/gstrusage.c
+++ b/plugins/tracers/gstrusage.c
@@ -146,10 +146,9 @@ free_thread_stats (gpointer data)
 }
 
 static void
-do_stats (GstTracer * obj, va_list var_args)
+do_stats (GstTracer * obj, guint64 ts)
 {
   GstRUsageTracer *self = GST_RUSAGE_TRACER_CAST (obj);
-  guint64 ts = va_arg (var_args, guint64);
   GstThreadStats *stats;
   gpointer thread_id = g_thread_self ();
   guint avg_cpuload, cur_cpuload;
@@ -348,7 +347,7 @@ gst_rusage_tracer_init (GstRUsageTracer * self)
 {
   GstTracer *tracer = GST_TRACER (self);
 
-  gst_tracer_register_hook_id (tracer, 0, do_stats);
+  gst_tracer_register_hook_id (tracer, 0, G_CALLBACK (do_stats));
 
   self->threads = g_hash_table_new_full (NULL, NULL, NULL, free_thread_stats);
   self->tvs_proc = make_trace_values (GST_SECOND);
diff --git a/plugins/tracers/gststats.c b/plugins/tracers/gststats.c
index b0e90cf1a..90e6fa3c9 100644
--- a/plugins/tracers/gststats.c
+++ b/plugins/tracers/gststats.c
@@ -336,11 +336,9 @@ do_element_stats (GstStatsTracer * self, GstPad * pad, GstClockTime elapsed1,
 /* hooks */
 
 static void
-do_push_buffer_pre (GstStatsTracer * self, va_list var_args)
+do_push_buffer_pre (GstStatsTracer * self, guint64 ts, GstPad * this_pad,
+    GstBuffer * buffer)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *this_pad = va_arg (var_args, GstPad *);
-  GstBuffer *buffer = va_arg (var_args, GstBuffer *);
   GstPadStats *this_pad_stats = get_pad_stats (self, this_pad);
   GstPad *that_pad = GST_PAD_PEER (this_pad);
   GstPadStats *that_pad_stats = get_pad_stats (self, that_pad);
@@ -350,10 +348,8 @@ do_push_buffer_pre (GstStatsTracer * self, va_list var_args)
 }
 
 static void
-do_push_buffer_post (GstStatsTracer * self, va_list var_args)
+do_push_buffer_post (GstStatsTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstPadStats *stats = get_pad_stats (self, pad);
 
   do_element_stats (self, pad, stats->last_ts, ts);
@@ -380,11 +376,9 @@ do_push_buffer_list_item (GstBuffer ** buffer, guint idx, gpointer user_data)
 }
 
 static void
-do_push_buffer_list_pre (GstStatsTracer * self, va_list var_args)
+do_push_buffer_list_pre (GstStatsTracer * self, guint64 ts, GstPad * this_pad,
+    GstBufferList * list)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *this_pad = va_arg (var_args, GstPad *);
-  GstBufferList *list = va_arg (var_args, GstBufferList *);
   GstPadStats *this_pad_stats = get_pad_stats (self, this_pad);
   GstPad *that_pad = GST_PAD_PEER (this_pad);
   GstPadStats *that_pad_stats = get_pad_stats (self, that_pad);
@@ -396,30 +390,24 @@ do_push_buffer_list_pre (GstStatsTracer * self, va_list var_args)
 }
 
 static void
-do_push_buffer_list_post (GstStatsTracer * self, va_list var_args)
+do_push_buffer_list_post (GstStatsTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstPadStats *stats = get_pad_stats (self, pad);
 
   do_element_stats (self, pad, stats->last_ts, ts);
 }
 
 static void
-do_pull_range_pre (GstStatsTracer * self, va_list var_args)
+do_pull_range_pre (GstStatsTracer * self, guint64 ts, GstPad * pad)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
   GstPadStats *stats = get_pad_stats (self, pad);
   stats->last_ts = ts;
 }
 
 static void
-do_pull_range_post (GstStatsTracer * self, va_list var_args)
+do_pull_range_post (GstStatsTracer * self, guint64 ts, GstPad * this_pad,
+    GstBuffer * buffer)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *this_pad = va_arg (var_args, GstPad *);
-  GstBuffer *buffer = va_arg (var_args, GstBuffer *);
   GstPadStats *this_pad_stats = get_pad_stats (self, this_pad);
   guint64 last_ts = this_pad_stats->last_ts;
   GstPad *that_pad = GST_PAD_PEER (this_pad);
@@ -433,11 +421,9 @@ do_pull_range_post (GstStatsTracer * self, va_list var_args)
 }
 
 static void
-do_push_event_pre (GstStatsTracer * self, va_list var_args)
+do_push_event_pre (GstStatsTracer * self, guint64 ts, GstPad * pad,
+    GstEvent * ev)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstPad *pad = va_arg (var_args, GstPad *);
-  GstEvent *ev = va_arg (var_args, GstEvent *);
   GstElement *elem = get_real_pad_parent (pad);
   GstElementStats *elem_stats = get_element_stats (self, elem);
   GstPadStats *pad_stats = get_pad_stats (self, pad);
@@ -451,11 +437,9 @@ do_push_event_pre (GstStatsTracer * self, va_list var_args)
 }
 
 static void
-do_post_message_pre (GstStatsTracer * self, va_list var_args)
+do_post_message_pre (GstStatsTracer * self, guint64 ts, GstElement * elem,
+    GstMessage * msg)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstElement *elem = va_arg (var_args, GstElement *);
-  GstMessage *msg = va_arg (var_args, GstMessage *);
   GstElementStats *stats = get_element_stats (self, elem);
 
   stats->last_ts = ts;
@@ -466,11 +450,9 @@ do_post_message_pre (GstStatsTracer * self, va_list var_args)
 }
 
 static void
-do_query_pre (GstStatsTracer * self, va_list var_args)
+do_query_pre (GstStatsTracer * self, guint64 ts, GstElement * elem,
+    GstQuery * qry)
 {
-  guint64 ts = va_arg (var_args, guint64);
-  GstElement *elem = va_arg (var_args, GstElement *);
-  GstQuery *qry = va_arg (var_args, GstQuery *);
   GstElementStats *stats = get_element_stats (self, elem);
 
   stats->last_ts = ts;
@@ -565,21 +547,21 @@ gst_stats_tracer_init (GstStatsTracer * self)
   GstTracer *tracer = GST_TRACER (self);
 
   gst_tracer_register_hook (tracer, "pad-push-pre",
-      (GstTracerHookFunction) do_push_buffer_pre);
+      G_CALLBACK (do_push_buffer_pre));
   gst_tracer_register_hook (tracer, "pad-push-post",
-      (GstTracerHookFunction) do_push_buffer_post);
+      G_CALLBACK (do_push_buffer_post));
   gst_tracer_register_hook (tracer, "pad-push-list-pre",
-      (GstTracerHookFunction) do_push_buffer_list_pre);
+      G_CALLBACK (do_push_buffer_list_pre));
   gst_tracer_register_hook (tracer, "pad-push-list-post",
-      (GstTracerHookFunction) do_push_buffer_list_post);
+      G_CALLBACK (do_push_buffer_list_post));
   gst_tracer_register_hook (tracer, "pad-pull-range-pre",
-      (GstTracerHookFunction) do_pull_range_pre);
+      G_CALLBACK (do_pull_range_pre));
   gst_tracer_register_hook (tracer, "pad-pull-range-post",
-      (GstTracerHookFunction) do_pull_range_post);
+      G_CALLBACK (do_pull_range_post));
   gst_tracer_register_hook (tracer, "pad-push-event-pre",
-      (GstTracerHookFunction) do_push_event_pre);
+      G_CALLBACK (do_push_event_pre));
   gst_tracer_register_hook (tracer, "element-post-message-pre",
-      (GstTracerHookFunction) do_post_message_pre);
+      G_CALLBACK (do_post_message_pre));
   gst_tracer_register_hook (tracer, "element-query-pre",
-      (GstTracerHookFunction) do_query_pre);
+      G_CALLBACK (do_query_pre));
 }