Creating GstCaps for "audio/*" mediatype

[4ernov]

Hello,

I'm trying to create caps for some common audio stream without
specifying any details to let decodebin and typefind detect the format
and create proper pipeline. List of defined types
(http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/section-types-definitions.html)
says, that "audio/*" is right for it. But when I'm trying to write

GstCaps* audio_caps = gst_caps_new_empty_simple("audio/*");

I receive

GStreamer-CRITICAL **: gst_structure_new_empty: assertion
`gst_structure_validate_name (name)' failed

and it's right as a check in gst_structure_validate_name()

while (*s && (g_ascii_isalnum (*s) || strchr ("/-_.:+", *s) != NULL))

doesn't contain "*" character and consequently consider it as invalid.

The same problem is for other ".../*" types (e.g. "video/*").

Is it something in GstStructure, should I use another notation or such
a general caps simply can't be defined in code?

Thank you!

Best regards,
Alexey Chernov