## Functions

### gst_tracing_get_active_tracers

    GList *
    gst_tracing_get_active_tracers ()

Get a list of all active tracer objects owned by the tracing framework for the entirety of the run-time of the process or till gst_deinit is called.

Returns ( [transfer: full][element-typeGst.Tracer]) –

A GList of GstTracer objects

Since : 1.18

### Gst.prototype.tracing_get_active_tracers

    function Gst.prototype.tracing_get_active_tracers(): {
        // javascript wrapper for 'gst_tracing_get_active_tracers'
    }

Get a list of all active tracer objects owned by the tracing framework for the entirety of the run-time of the process or till Gst.prototype.deinit is called.

Returns ([ Gst.Tracer ]) –

A GLib.List of Gst.Tracer objects

Since : 1.18

### Gst.tracing_get_active_tracers

    def Gst.tracing_get_active_tracers ():
        #python wrapper for 'gst_tracing_get_active_tracers'

Get a list of all active tracer objects owned by the tracing framework for the entirety of the run-time of the process or till Gst.deinit is called.

Returns ([ Gst.Tracer ]) –

A GLib.List of Gst.Tracer objects

Since : 1.18

### gst_tracing_register_hook

    gst_tracing_register_hook (GstTracer * tracer,
                               const gchar * detail,
                               GCallback func)

Register func to be called when the trace hook detail is getting invoked. Use NULL for detail to register to all hooks.

Parameters:

`tracer` –

the tracer

`detail` –

the detailed hook

`func` ( [scope async]) –

the callback

Since : 1.8

### Gst.prototype.tracing_register_hook

    function Gst.prototype.tracing_register_hook(tracer: Gst.Tracer, detail: String, func: GObject.Callback): {
        // javascript wrapper for 'gst_tracing_register_hook'
    }

Register func to be called when the trace hook detail is getting invoked. Use null for detail to register to all hooks.

Parameters:

`tracer` (Gst.Tracer) –

the tracer

`detail` (String) –

the detailed hook

`func` (GObject.Callback) –

the callback

Since : 1.8

### Gst.tracing_register_hook

    def Gst.tracing_register_hook (tracer, detail, func):
        #python wrapper for 'gst_tracing_register_hook'

Register func to be called when the trace hook detail is getting invoked. Use None for detail to register to all hooks.

Parameters:

`tracer` (Gst.Tracer) –

the tracer

`detail` (str) –

the detailed hook

`func` (GObject.Callback) –

the callback

Since : 1.8

## Function Macros

### GST_TRACER_BIN_ADD_POST

    #define GST_TRACER_BIN_ADD_POST(bin, element, result) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_BIN_ADD_POST), \
        GstTracerHookBinAddPost, (GST_TRACER_ARGS, bin, element, result)); \
    }G_STMT_END

### GST_TRACER_BIN_ADD_PRE

    #define GST_TRACER_BIN_ADD_PRE(bin, element) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_BIN_ADD_PRE), \
        GstTracerHookBinAddPre, (GST_TRACER_ARGS, bin, element)); \
    }G_STMT_END

### GST_TRACER_BIN_REMOVE_POST

    #define GST_TRACER_BIN_REMOVE_POST(bin, result) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_BIN_REMOVE_POST), \
        GstTracerHookBinRemovePost, (GST_TRACER_ARGS, bin, result)); \
    }G_STMT_END

### GST_TRACER_BIN_REMOVE_PRE

    #define GST_TRACER_BIN_REMOVE_PRE(bin, element) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_BIN_REMOVE_PRE), \
        GstTracerHookBinRemovePre, (GST_TRACER_ARGS, bin, element)); \
    }G_STMT_END

### GST_TRACER_DISPATCH

    #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

### GST_TRACER_ELEMENT_ADD_PAD

    #define GST_TRACER_ELEMENT_ADD_PAD(element, pad) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_ADD_PAD), \
        GstTracerHookElementAddPad, (GST_TRACER_ARGS, element, pad)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_CHANGE_STATE_POST

    #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

### GST_TRACER_ELEMENT_CHANGE_STATE_PRE

    #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

### GST_TRACER_ELEMENT_NEW

    #define GST_TRACER_ELEMENT_NEW(element) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_NEW), \
        GstTracerHookElementNew, (GST_TRACER_ARGS, element)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_POST_MESSAGE_POST

    #define GST_TRACER_ELEMENT_POST_MESSAGE_POST(element, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_POST), \
        GstTracerHookElementPostMessagePost, (GST_TRACER_ARGS, element, res)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_POST_MESSAGE_PRE

    #define GST_TRACER_ELEMENT_POST_MESSAGE_PRE(element, message) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_POST_MESSAGE_PRE), \
        GstTracerHookElementPostMessagePre, (GST_TRACER_ARGS, element, message)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_QUERY_POST

    #define GST_TRACER_ELEMENT_QUERY_POST(element, query, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_POST), \
        GstTracerHookElementQueryPost, (GST_TRACER_ARGS, element, query, res)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_QUERY_PRE

    #define GST_TRACER_ELEMENT_QUERY_PRE(element, query) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_QUERY_PRE), \
        GstTracerHookElementQueryPre, (GST_TRACER_ARGS, element, query)); \
    }G_STMT_END

### GST_TRACER_ELEMENT_REMOVE_PAD

    #define GST_TRACER_ELEMENT_REMOVE_PAD(element, pad) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_ELEMENT_REMOVE_PAD), \
        GstTracerHookElementRemovePad, (GST_TRACER_ARGS, element, pad)); \
    }G_STMT_END

### GST_TRACER_MINI_OBJECT_CREATED

    #define GST_TRACER_MINI_OBJECT_CREATED(object) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_MINI_OBJECT_CREATED), \
        GstTracerHookMiniObjectCreated, (GST_TRACER_ARGS, object)); \
    }G_STMT_END

### GST_TRACER_MINI_OBJECT_DESTROYED

    #define GST_TRACER_MINI_OBJECT_DESTROYED(object) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_MINI_OBJECT_DESTROYED), \
        GstTracerHookMiniObjectDestroyed, (GST_TRACER_ARGS, object)); \
    }G_STMT_END

### GST_TRACER_MINI_OBJECT_REFFED

    #define GST_TRACER_MINI_OBJECT_REFFED(object, new_refcount) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_MINI_OBJECT_REFFED), \
        GstTracerHookMiniObjectReffed, (GST_TRACER_ARGS, object, new_refcount)); \
    }G_STMT_END

### GST_TRACER_MINI_OBJECT_UNREFFED

    #define GST_TRACER_MINI_OBJECT_UNREFFED(object, new_refcount) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_MINI_OBJECT_UNREFFED), \
        GstTracerHookMiniObjectUnreffed, (GST_TRACER_ARGS, object, new_refcount)); \
    }G_STMT_END

### GST_TRACER_OBJECT_CREATED

    #define GST_TRACER_OBJECT_CREATED(object) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_OBJECT_CREATED), \
        GstTracerHookObjectCreated, (GST_TRACER_ARGS, object)); \
    }G_STMT_END

### GST_TRACER_OBJECT_DESTROYED

    #define GST_TRACER_OBJECT_DESTROYED(object) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_OBJECT_DESTROYED), \
        GstTracerHookObjectDestroyed, (GST_TRACER_ARGS, object)); \
    }G_STMT_END

### GST_TRACER_OBJECT_REFFED

    #define GST_TRACER_OBJECT_REFFED(object, new_refcount) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_OBJECT_REFFED), \
        GstTracerHookObjectReffed, (GST_TRACER_ARGS, object, new_refcount)); \
    }G_STMT_END

### GST_TRACER_OBJECT_UNREFFED

    #define GST_TRACER_OBJECT_UNREFFED(object, new_refcount) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_OBJECT_UNREFFED), \
        GstTracerHookObjectUnreffed, (GST_TRACER_ARGS, object, new_refcount)); \
    }G_STMT_END

### GST_TRACER_PAD_CHAIN_LIST_POST

    #define GST_TRACER_PAD_CHAIN_LIST_POST(pad, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_CHAIN_LIST_POST), \
        GstTracerHookPadChainListPost, (GST_TRACER_ARGS, pad, res)); \
    }G_STMT_END

Dispatches the "pad-chain-list-post" hook.

Parameters:

`pad` –

a GstPad

`res` –

a GstFlowReturn

### GST_TRACER_PAD_CHAIN_LIST_PRE

    #define GST_TRACER_PAD_CHAIN_LIST_PRE(pad, list) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_CHAIN_LIST_PRE), \
        GstTracerHookPadChainListPre, (GST_TRACER_ARGS, pad, list)); \
    }G_STMT_END

Dispatches the "pad-chain-list-pre" hook.

Parameters:

`pad` –

a GstPad

`list` –

a GstBufferList

### GST_TRACER_PAD_CHAIN_POST

    #define GST_TRACER_PAD_CHAIN_POST(pad, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_CHAIN_POST), \
        GstTracerHookPadChainPost, (GST_TRACER_ARGS, pad, res)); \
    }G_STMT_END

Dispatches the "pad-chain-post" hook.

Parameters:

`pad` –

a GstPad

`res` –

a GstFlowReturn

### GST_TRACER_PAD_CHAIN_PRE

    #define GST_TRACER_PAD_CHAIN_PRE(pad, buffer) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_CHAIN_PRE), \
        GstTracerHookPadChainPre, (GST_TRACER_ARGS, pad, buffer)); \
    }G_STMT_END

Dispatches the "pad-chain-pre" hook.

Parameters:

`pad` –

a GstPad

`buffer` –

a GstBuffer

### GST_TRACER_PAD_LINK_POST

    #define GST_TRACER_PAD_LINK_POST(srcpad, sinkpad, result) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_LINK_POST), \
        GstTracerHookPadLinkPost, (GST_TRACER_ARGS, srcpad, sinkpad, result)); \
    }G_STMT_END

### GST_TRACER_PAD_LINK_PRE

    #define GST_TRACER_PAD_LINK_PRE(srcpad, sinkpad) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_LINK_PRE), \
        GstTracerHookPadLinkPre, (GST_TRACER_ARGS, srcpad, sinkpad)); \
    }G_STMT_END

### GST_TRACER_PAD_PULL_RANGE_POST

    #define GST_TRACER_PAD_PULL_RANGE_POST(pad, buffer, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_POST), \
        GstTracerHookPadPullRangePost, (GST_TRACER_ARGS, pad, buffer, res)); \
    }G_STMT_END

### GST_TRACER_PAD_PULL_RANGE_PRE

    #define GST_TRACER_PAD_PULL_RANGE_PRE(pad, offset, size) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PULL_RANGE_PRE), \
        GstTracerHookPadPullRangePre, (GST_TRACER_ARGS, pad, offset, size)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_EVENT_POST

    #define GST_TRACER_PAD_PUSH_EVENT_POST(pad, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_POST), \
        GstTracerHookPadPushEventPost, (GST_TRACER_ARGS, pad, res)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_EVENT_PRE

    #define GST_TRACER_PAD_PUSH_EVENT_PRE(pad, event) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_EVENT_PRE), \
        GstTracerHookPadPushEventPre, (GST_TRACER_ARGS, pad, event)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_LIST_POST

    #define GST_TRACER_PAD_PUSH_LIST_POST(pad, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_POST), \
        GstTracerHookPadPushListPost, (GST_TRACER_ARGS, pad, res)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_LIST_PRE

    #define GST_TRACER_PAD_PUSH_LIST_PRE(pad, list) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_LIST_PRE), \
        GstTracerHookPadPushListPre, (GST_TRACER_ARGS, pad, list)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_POST

    #define GST_TRACER_PAD_PUSH_POST(pad, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_POST), \
        GstTracerHookPadPushPost, (GST_TRACER_ARGS, pad, res)); \
    }G_STMT_END

### GST_TRACER_PAD_PUSH_PRE

    #define GST_TRACER_PAD_PUSH_PRE(pad, buffer) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_PUSH_PRE), \
        GstTracerHookPadPushPre, (GST_TRACER_ARGS, pad, buffer)); \
    }G_STMT_END

### GST_TRACER_PAD_QUERY_POST

    #define GST_TRACER_PAD_QUERY_POST(pad, query, res) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_QUERY_POST), \
        GstTracerHookPadQueryPost, (GST_TRACER_ARGS, pad, query, res)); \
    }G_STMT_END

### GST_TRACER_PAD_QUERY_PRE

    #define GST_TRACER_PAD_QUERY_PRE(pad, query) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_QUERY_PRE), \
        GstTracerHookPadQueryPre, (GST_TRACER_ARGS, pad, query)); \
    }G_STMT_END

### GST_TRACER_PAD_UNLINK_POST

    #define GST_TRACER_PAD_UNLINK_POST(srcpad, sinkpad, result) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_UNLINK_POST), \
        GstTracerHookPadUnlinkPost, (GST_TRACER_ARGS, srcpad, sinkpad, result)); \
    }G_STMT_END

### GST_TRACER_PAD_UNLINK_PRE

    #define GST_TRACER_PAD_UNLINK_PRE(srcpad, sinkpad) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PAD_UNLINK_PRE), \
        GstTracerHookPadUnlinkPre, (GST_TRACER_ARGS, srcpad, sinkpad)); \
    }G_STMT_END

### GST_TRACER_PLUGIN_FEATURE_LOADED

    #define GST_TRACER_PLUGIN_FEATURE_LOADED(feature) G_STMT_START{ \
      GST_TRACER_DISPATCH(GST_TRACER_QUARK(HOOK_PLUGIN_FEATURE_LOADED), \
        GstTracerHookPluginFeatureLoaded, (GST_TRACER_ARGS, feature)); \
    }G_STMT_END

Add a tracepoint when a plugin feature is loaded.

Parameters:

`feature` –

The feature that this tracer is called for

### GST_TRACER_QUARK

    #define GST_TRACER_QUARK(q) _priv_gst_tracer_quark_table[GST_TRACER_QUARK_##q]

## Constants

### GST_TRACER_ARGS

    #define GST_TRACER_ARGS h->tracer, ts

### GST_TRACER_IS_ENABLED

    #define GST_TRACER_IS_ENABLED (_priv_tracer_enabled)

### GST_TRACER_TS

    #define GST_TRACER_TS \
      GST_CLOCK_DIFF (_priv_gst_start_time, gst_util_get_timestamp ())

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