How to read array of strings from GstStructure during caps negotiation?

[Baby Octopus]

On Wed, Aug 31, 2016 at 12:27 PM, Sebastian Dröge-3 [via GStreamer-devel] <
ml-node+s966125n4679299h36 at n4.nabble.com> wrote:

> On Tue, 2016-08-30 at 04:05 -0700, Baby Octopus wrote:
>
> > Hi,
> >
> > When my allowed caps in aac encoder has array of stream-formats i.e.,
> > stream-format={raw,adts},  gst_structure_get_string() returns NULL
> >
> > But when it is a scalar i.e,
> > stream-format={raw} it returns non NULL
> >
> > My question is how to read array of strings in GstStructure? I see a
> > bug in faac encoder due to this in following lines
> >     if ((str = gst_structure_get_string (s, "stream-format"))) {
> >       if (strcmp (str, "adts") == 0) {
> >         GST_DEBUG_OBJECT (faac, "use ADTS format for output");
> >         faac->outputformat = 1;
> >       } else if (strcmp (str, "raw") == 0) {
> >         GST_DEBUG_OBJECT (faac, "use RAW format for output");
> >         faac->outputformat = 0;
> >       } else {
> >         GST_DEBUG_OBJECT (faac, "unknown stream-format: %s", str);
> >         faac->outputformat = 0;
> >       }
> >     }
> Those lines only support a single string, no array. I assume the caps
> are fixated before that already so that only a single string is left.
>
I don't think we can assume that. Can we? When the encoder and the muxer
support multiple stream-formats, its upto the encoder to decide
which stream-format to choose. Isn't it?


>
> For handling these arrays, check the gst_value_list_*() API.
> Note that you don't want the gst_value_array_*() API here.
>

Thank you very much. Let me try this

>
> --
> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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