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4a402c1c7d
Found via `codespell` https://bugzilla.gnome.org/show_bug.cgi?id=795610
207 lines
6.3 KiB
C
207 lines
6.3 KiB
C
/* GStreamer
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* Copyright (C) 2013 Stefan Sauer <ensonic@users.sf.net>
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*
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* gsttracerutils.c: tracing subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* Tracing subsystem:
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*
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* The tracing subsystem provides hooks in the core library and API for modules
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* to attach to them.
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*
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* The user can activate tracers by setting the environment variable GST_TRACE
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* to a ';' separated list of tracers.
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*
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* Note that instantiating tracers at runtime is possible but is not thread safe
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* and needs to be done before any pipeline state is set to PAUSED.
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*/
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#define GST_USE_UNSTABLE_API
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#include "gst_private.h"
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#include "gsttracer.h"
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#include "gsttracerfactory.h"
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#include "gsttracerutils.h"
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#ifndef GST_DISABLE_GST_TRACER_HOOKS
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/* tracer quarks */
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/* These strings must match order and number declared in the GstTracerQuarkId
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* enum in gsttracerutils.h! */
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static const gchar *_quark_strings[] = {
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"pad-push-pre", "pad-push-post", "pad-push-list-pre", "pad-push-list-post",
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"pad-pull-range-pre", "pad-pull-range-post", "pad-push-event-pre",
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"pad-push-event-post", "pad-query-pre", "pad-query-post",
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"element-post-message-pre",
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"element-post-message-post", "element-query-pre", "element-query-post",
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"element-new", "element-add-pad", "element-remove-pad",
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"bin-add-pre", "bin-add-post", "bin-remove-pre", "bin-remove-post",
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"pad-link-pre", "pad-link-post", "pad-unlink-pre", "pad-unlink-post",
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"element-change-state-pre", "element-change-state-post",
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"mini-object-created", "mini-object-destroyed", "object-created",
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"object-destroyed", "mini-object-reffed", "mini-object-unreffed",
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"object-reffed", "object-unreffed",
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};
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GQuark _priv_gst_tracer_quark_table[GST_TRACER_QUARK_MAX];
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/* tracing helpers */
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gboolean _priv_tracer_enabled = FALSE;
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GHashTable *_priv_tracers = NULL;
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/* Initialize the tracing system */
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void
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_priv_gst_tracing_init (void)
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{
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gint i = 0;
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const gchar *env = g_getenv ("GST_TRACERS");
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/* We initialize the tracer sub system even if the end
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* user did not activate it through the env variable
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* so that external tools can use it anyway */
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GST_DEBUG ("Initializing GstTracer");
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_priv_tracers = g_hash_table_new (NULL, NULL);
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if (G_N_ELEMENTS (_quark_strings) != GST_TRACER_QUARK_MAX)
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g_warning ("the quark table is not consistent! %d != %d",
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(gint) G_N_ELEMENTS (_quark_strings), GST_TRACER_QUARK_MAX);
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for (i = 0; i < GST_TRACER_QUARK_MAX; i++) {
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_priv_gst_tracer_quark_table[i] =
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g_quark_from_static_string (_quark_strings[i]);
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}
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if (env != NULL && *env != '\0') {
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GstRegistry *registry = gst_registry_get ();
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GstPluginFeature *feature;
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GstTracerFactory *factory;
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gchar **t = g_strsplit_set (env, ";", 0);
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gchar *params;
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GST_INFO ("enabling tracers: '%s'", env);
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i = 0;
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while (t[i]) {
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// check t[i] for params
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if ((params = strchr (t[i], '('))) {
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gchar *end = strchr (¶ms[1], ')');
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*params = '\0';
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params++;
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if (end)
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*end = '\0';
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} else {
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params = NULL;
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}
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GST_INFO ("checking tracer: '%s'", t[i]);
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if ((feature = gst_registry_lookup_feature (registry, t[i]))) {
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factory = GST_TRACER_FACTORY (gst_plugin_feature_load (feature));
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if (factory) {
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GstTracer *tracer;
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GST_INFO_OBJECT (factory, "creating tracer: type-id=%u",
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(guint) factory->type);
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tracer = g_object_new (factory->type, "params", params, NULL);
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/* Clear floating flag */
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gst_object_ref_sink (tracer);
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/* tracers register them self to the hooks */
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gst_object_unref (tracer);
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} else {
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GST_WARNING_OBJECT (feature,
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"loading plugin containing feature %s failed!", t[i]);
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}
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} else {
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GST_WARNING ("no tracer named '%s'", t[i]);
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}
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i++;
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}
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g_strfreev (t);
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}
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}
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void
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_priv_gst_tracing_deinit (void)
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{
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GList *h_list, *h_node, *t_node;
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GstTracerHook *hook;
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_priv_tracer_enabled = FALSE;
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if (!_priv_tracers)
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return;
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/* shutdown tracers for final reports */
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h_list = g_hash_table_get_values (_priv_tracers);
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for (h_node = h_list; h_node; h_node = g_list_next (h_node)) {
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for (t_node = h_node->data; t_node; t_node = g_list_next (t_node)) {
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hook = (GstTracerHook *) t_node->data;
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gst_object_unref (hook->tracer);
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g_slice_free (GstTracerHook, hook);
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}
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g_list_free (h_node->data);
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}
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g_list_free (h_list);
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g_hash_table_destroy (_priv_tracers);
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_priv_tracers = NULL;
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}
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static void
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gst_tracing_register_hook_id (GstTracer * tracer, GQuark detail, GCallback func)
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{
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gpointer key = GINT_TO_POINTER (detail);
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GList *list = g_hash_table_lookup (_priv_tracers, key);
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GstTracerHook *hook = g_slice_new0 (GstTracerHook);
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hook->tracer = gst_object_ref (tracer);
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hook->func = func;
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list = g_list_prepend (list, hook);
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g_hash_table_replace (_priv_tracers, key, list);
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GST_DEBUG ("registering tracer for '%s', list.len=%d",
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(detail ? g_quark_to_string (detail) : "*"), g_list_length (list));
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_priv_tracer_enabled = TRUE;
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}
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/**
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* gst_tracing_register_hook:
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* @tracer: the tracer
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* @detail: the detailed hook
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* @func: (scope async): the callback
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*
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* Register @func to be called when the trace hook @detail is getting invoked.
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* Use %NULL for @detail to register to all hooks.
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*/
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void
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gst_tracing_register_hook (GstTracer * tracer, const gchar * detail,
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GCallback func)
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{
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gst_tracing_register_hook_id (tracer, g_quark_try_string (detail), func);
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}
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#else /* !GST_DISABLE_GST_TRACER_HOOKS */
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void
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gst_tracing_register_hook (GstTracer * tracer, const gchar * detail,
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GCallback func)
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{
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}
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#endif /* GST_DISABLE_GST_TRACER_HOOKS */
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