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aae5f58dd1
It's not really possible for us to recover when someone uses the gst_tracer_record_new() API incorrectly. Also, document a piece of somewhat-obscure code.
275 lines
8 KiB
C
275 lines
8 KiB
C
/* GStreamer
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* Copyright (C) 2016 Stefan Sauer <ensonic@users.sf.net>
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*
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* gsttracerrecord.c: tracer log record class
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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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/**
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* SECTION:gsttracerrecord
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* @title: GstTracerRecord
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* @short_description: Trace log entry class
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*
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* Tracing modules will create instances of this class to announce the data they
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* will log and create a log formatter.
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*
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* Since: 1.8
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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 "gstenumtypes.h"
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#include "gstinfo.h"
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#include "gststructure.h"
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#include "gsttracerrecord.h"
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#include "gstvalue.h"
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#include <gobject/gvaluecollector.h>
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GST_DEBUG_CATEGORY_EXTERN (tracer_debug);
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#define GST_CAT_DEFAULT tracer_debug
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struct _GstTracerRecord
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{
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GstObject parent;
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GstStructure *spec;
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gchar *format;
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};
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struct _GstTracerRecordClass
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{
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GstObjectClass parent_class;
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};
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#define gst_tracer_record_parent_class parent_class
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G_DEFINE_TYPE (GstTracerRecord, gst_tracer_record, GST_TYPE_OBJECT);
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static gboolean
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build_field_template (GQuark field_id, const GValue * value, gpointer user_data)
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{
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GString *s = (GString *) user_data;
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const GstStructure *sub;
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GValue template_value = { 0, };
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GType type = G_TYPE_INVALID;
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GstTracerValueFlags flags = GST_TRACER_VALUE_FLAGS_NONE;
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gboolean res;
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if (G_VALUE_TYPE (value) != GST_TYPE_STRUCTURE) {
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GST_ERROR ("expected field of type GstStructure, but %s is %s",
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g_quark_to_string (field_id), G_VALUE_TYPE_NAME (value));
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return FALSE;
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}
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sub = gst_value_get_structure (value);
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gst_structure_get (sub, "type", G_TYPE_GTYPE, &type, "flags",
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GST_TYPE_TRACER_VALUE_FLAGS, &flags, NULL);
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if (flags & GST_TRACER_VALUE_FLAGS_OPTIONAL) {
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gchar *opt_name = g_strconcat ("have-", g_quark_to_string (field_id), NULL);
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/* add a boolean field, that indicates the presence of the next field */
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g_value_init (&template_value, G_TYPE_BOOLEAN);
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priv__gst_structure_append_template_to_gstring (g_quark_from_string
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(opt_name), &template_value, s);
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g_value_unset (&template_value);
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g_free (opt_name);
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}
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g_value_init (&template_value, type);
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res = priv__gst_structure_append_template_to_gstring (field_id,
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&template_value, s);
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g_value_unset (&template_value);
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return res;
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}
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static void
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gst_tracer_record_build_format (GstTracerRecord * self)
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{
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GstStructure *structure = self->spec;
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GString *s;
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gchar *name = (gchar *) g_quark_to_string (structure->name);
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gchar *p;
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g_return_if_fail (g_str_has_suffix (name, ".class"));
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/* announce the format */
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GST_TRACE ("%" GST_PTR_FORMAT, structure);
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/* cut off '.class' suffix */
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name = g_strdup (name);
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p = strrchr (name, '.');
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g_assert (p != NULL);
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*p = '\0';
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s = g_string_sized_new (STRUCTURE_ESTIMATED_STRING_LEN (structure));
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g_string_append (s, name);
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gst_structure_foreach (structure, build_field_template, s);
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g_string_append_c (s, ';');
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self->format = g_string_free (s, FALSE);
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GST_DEBUG ("new format string: %s", self->format);
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g_free (name);
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}
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static void
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gst_tracer_record_dispose (GObject * object)
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{
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GstTracerRecord *self = GST_TRACER_RECORD (object);
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if (self->spec) {
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gst_structure_free (self->spec);
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self->spec = NULL;
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}
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g_free (self->format);
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self->format = NULL;
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}
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static void
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gst_tracer_record_class_init (GstTracerRecordClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->dispose = gst_tracer_record_dispose;
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}
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static void
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gst_tracer_record_init (GstTracerRecord * self)
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{
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}
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/**
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* gst_tracer_record_new:
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* @name: name of new record, must end on ".class".
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* @firstfield: name of first field to set
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* @...: additional arguments
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*
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* Create a new tracer record. The record instance can be used to efficiently
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* log entries using gst_tracer_record_log().
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*
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* The @name without the ".class" suffix will be used for the log records.
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* There must be fields for each value that gets logged where the field name is
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* the value name. The field must be a #GstStructure describing the value. The
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* sub structure must contain a field called 'type' of %G_TYPE_GTYPE that
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* contains the GType of the value. The resulting #GstTracerRecord will take
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* ownership of the field structures.
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*
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* The way to deal with optional values is to log an additional boolean before
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* the optional field, that if %TRUE signals that the optional field is valid
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* and %FALSE signals that the optional field should be ignored. One must still
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* log a placeholder value for the optional field though. Please also note, that
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* pointer type values must not be NULL - the underlying serialisation can not
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* handle that right now.
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*
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* > Please note that this is still under discussion and subject to change.
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*
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* Returns: (transfer full): a new #GstTracerRecord
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*/
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GstTracerRecord *
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gst_tracer_record_new (const gchar * name, const gchar * firstfield, ...)
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{
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GstTracerRecord *self;
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GstStructure *structure;
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va_list varargs;
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gchar *err = NULL;
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GType type;
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GQuark id;
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va_start (varargs, firstfield);
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structure = gst_structure_new_empty (name);
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while (firstfield) {
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GValue val = { 0, };
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id = g_quark_from_string (firstfield);
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type = va_arg (varargs, GType);
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/* all fields passed here must be GstStructures which we take over */
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if (type != GST_TYPE_STRUCTURE) {
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GST_ERROR ("expected field of type GstStructure, but %s is %s",
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firstfield, g_type_name (type));
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va_end (varargs);
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gst_structure_free (structure);
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return NULL;
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}
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G_VALUE_COLLECT_INIT (&val, type, varargs, G_VALUE_NOCOPY_CONTENTS, &err);
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if (G_UNLIKELY (err)) {
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g_critical ("%s", err);
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g_free (err);
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break;
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}
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/* give ownership of the GstStructure "value" collected from varargs
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* to this structure by unsetting the NOCOPY_CONTENTS collect-flag.
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* see boxed_proxy_collect_value in glib's gobject/gboxed.c */
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val.data[1].v_uint &= ~G_VALUE_NOCOPY_CONTENTS;
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gst_structure_id_take_value (structure, id, &val);
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firstfield = va_arg (varargs, gchar *);
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}
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va_end (varargs);
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self = g_object_new (GST_TYPE_TRACER_RECORD, NULL);
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/* Clear floating flag */
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gst_object_ref_sink (self);
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self->spec = structure;
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gst_tracer_record_build_format (self);
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return self;
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}
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#ifndef GST_DISABLE_GST_DEBUG
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/**
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* gst_tracer_record_log:
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* @self: the tracer-record
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* @...: the args as described in the spec-
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*
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* Serialzes the trace event into the log.
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*
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* Right now this is using the gstreamer debug log with the level TRACE (7) and
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* the category "GST_TRACER".
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*
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* > Please note that this is still under discussion and subject to change.
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*/
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void
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gst_tracer_record_log (GstTracerRecord * self, ...)
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{
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va_list var_args;
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/*
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* does it make sense to use the {file, line, func} from the tracer hook?
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* a)
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* - we'd need to pass them in the macros to gst_tracer_dispatch()
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* - and each tracer needs to grab them from the va_list and pass them here
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* b)
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* - we create a context in dispatch, pass that to the tracer
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* - and the tracer will pass that here
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* ideally we also use *our* ts instead of the one that
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* gst_debug_log_default() will pick
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*/
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va_start (var_args, self);
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if (G_LIKELY (GST_LEVEL_TRACE <= _gst_debug_min)) {
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gst_debug_log_valist (GST_CAT_DEFAULT, GST_LEVEL_TRACE, "", "", 0, NULL,
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self->format, var_args);
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}
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va_end (var_args);
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}
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#endif
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