Creating GstCaps for "audio/*" mediatype

[4ernov]

> On Di, 2013-08-27 at 13:24 +0400, 4ernov wrote:
> > 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?
>
> The caps names must be complete and are compared by equality, not by
> prefix match. "audio/*" is just not possible :)
>
> What exactly do you want to do, what's the bigger picture?

I'm trying to push an audio data stream to pipeline with appsrc. This
stream is encoded with one of several formats (aac or celt and
potentially others) and I'd like typefind to detect the actual format
rather than define it explicitly in caps of appsrc. Still I have to
set some caps to appsrc itself and the question is what caps should I
set for this use case.