[gst-devel] Parameter update rate (controlrate) discussion

[Stefan Kost]

Hej,

part #1 is now in CVS. I've added a GObjuect property to the controller.
Default is update stuff 10 times a second. What do you recomment for
updating plugins. E.g. is it okay if gst-plugins-base CVS requires
gstreamer-CVS ? Or should I wait for gstreamer-0.10.10 getting released
and then add the stuff to e.g. GstVolume and make gst-plugins-base
requiring gstreamer-0.10.10 ?

Stefan

Stefan Kost wrote:
> hi,
>
> elements like volume currently have the problem then when processing big
> buffers, they don't react to property updates during processing.
>
> gst_object_sync_values (G_OBJECT (this), timestamp);
> this->process (this, GST_BUFFER_DATA (outbuf), GST_BUFFER_SIZE (outbuf));
>
> IMHO they need to do:
>
> ctrl_rate = sampling_rate/10;
> wanted = ctrl_rate * sizeof(gint16);
> duration = GST_SECOND/10;
>
> gst_adapter_push (self->adapter, in);
> while (gst_adapter_available (self->adapter) > wanted) {
>     gst_object_sync_values (G_OBJECT (this), timestamp);
>     samples = (gint16 *) gst_adapter_take (self->adapter, wanted);
>     self->process (self, samples, wanted);
>     timestamp += duration;
>     ...
> }
>
> Now the questions are:
> 1.) The '10' means: update control point 10 times a second. Where should
> this come from?
> 1a) constant (define) in GstController
> 1b) object property of the GstController (so that apps can finetune that)
> 1c) ...
>
> 2.) Any problem with using the GstAdapter in elements that have
> controllable properties? In theory we could also push this onto the
> applications and force them to make sure that there sources create
> sufficiently small enough buffers. But that isn't so nice.
>
> What do you think?
>
> Stefan
>
>
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