Question about a custom decoder and caps renegotiation
Tim-Philipp Müller
t.i.m at zen.co.uk
Sun Jul 1 14:23:04 PDT 2012
On Sat, 2012-06-30 at 11:16 +0200, dv wrote:
Hi,
> I am writing a GStreamer plugin for a decoder. It already works fine,
> but outputs 16 bit integer samples at the moment, even though it
> supports many more formats.
>
> My question is how to inform the decoder about the desired sample
> format. My guess is that I should use upstream caps renegotation.
You don't need upstream renegotiation for this, that's to tell upstream
elements that something has changed downstream.
In your decoder, you can simply do a gst_pad_get_allowed_caps(srcpad).
If you get a non-NULL return value, just pick the first structure of the
GstCaps and use that (or fixate that if needed). The first structure(s)
in GstCaps are the preferred ones generally.
Cheers
-Tim
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