[Bug 760267] tracer: how to pass and structure tracing data (GstStructure, GVariant, etc.)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760267

--- Comment #2 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> ---
I've tried to use GVariant. The logging could be something like:

void
gst_tracer_log_trace (const gchar *format, ...)
{
  va_list var_args;
  GVariant *v;
  gchar *s;

  va_start (var_args, format);
  v = g_variant_new_va (format, NULLL, var_args);
  s = g_variant_print (v, FALSE);
  GST_TRACE ("%s", s);
  g_free (s);
  g_variant_unref (v);
  va_end (var_args);
}

The issue is that GVariant is only providing very few data types. Right now
with the GstStructure we can serialize GEnums
("pad-direction=(GstPadDirection)GST_PAD_SINK"), GstFractions and many more.

Also avoiding the intermediate GVariants would be nice. Another option could
be:

void
gst_tracer_log_trace (GType *types, guint n_types, ...)
{
  /* iterate over types and serialize them using GStValue. */
}

But if that hits a structure as a child (e.g. a message) it would serialize
this as we know it (with fields).
Anyway, this would only log the data. And we could log the types with the
initial spec.

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