Why is GstBuffer not writable in the _fill method of GstPushSrc?

[Ben Rush]

Yes, and I believe I have possibly narrowed it down. I should be able to
provide a self-contained example as well as even a cause for it sometime
today.

Thank you for your response.

On Mon, Apr 29, 2019, 01:29 Sebastian Dröge <sebastian at centricular.com
wrote:

> On Sun, 2019-04-28 at 10:23 -0500, Ben Rush wrote:
> > Just to be clear, I'm seeing examples of others doing what I want to
> > do. That is, write directly to the GstBuffer as a GstPushSrc.
> > Examples include:
> >
> >
> https://github.com/GStreamer/gst-plugins-bad/blob/master/gst/frei0r/gstfrei0rsrc.c
> (between lines 96 to
> > 106)
> >
> https://gitlab.collabora.com/gkiagia/gst-plugins-bad/blob/8cdfb13658a069cf8c45a3265bf865849d3dc8e9/ext/neon/gstneonhttpsrc.c
> (between lines 955 to
> > 995)
> >
> > Among others. So, I don't feel like what I'm doing is strange or out
> > of the ordinary. It's just that the map function call fails (returns
> > false) and gives me a null buffer to write to when I try to open it
> > with GST_MAP_WRITE. It succeeds when I try to open it with
> > GST_MAP_READ, but that makes no sense when I'm trying to WRITE to the
> > buffer.
>
> Can you provide a standalone testcase for this so we have an idea what
> your code is doing exactly and a way to reproduce it?
>
> As you say yourself, it's rather useless to have a non-writable buffer
> inside fill() and that definitely shouldn't happen.
>
> --
> Sebastian Dröge, Centricular Ltd · https://www.centricular.com
>
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