Controller doesn't work with volume element.

[Stefan Sauer]

On 08.03.2013 22:22, Nox Deleo wrote:
> If I set up a control binding to the 'volume' property of the volume
> element, it reports 'Failed to get values from controller'.
This is fixed in git since quite a while. The volume element requests an
array of volume factor values. This ensures smooth volume ramping for
cases where block sizes are big. This code path had a bug.

Stefan
>
> I'm using the following (Python) code.
>
> self.volume_1 = Gst.ElementFactory.make('volume', 'volume_1')
> self.volume_2 = Gst.ElementFactory.make('volume', 'volume_2')
>
> self.volume_1_cs = GstController.InterpolationControlSource.new()
> self.volume_2_cs = GstController.InterpolationControlSource.new()
> self.volume_1.add_control_binding(GstController.DirectControlBinding.new(self.volume_1,
> 'volume', self.volume_1_cs))
> self.volume_2.add_control_binding(GstController.DirectControlBinding.new(self.volume_2,
> 'volume', self.volume_2_cs))
> self.volume_1_cs.set_property('mode',
> GstController.InterpolationMode.CUBIC)
> self.volume_2_cs.set_property('mode',
> GstController.InterpolationMode.CUBIC)
>
> Could this be related to this thread?:
> http://gstreamer-devel.966125.n4.nabble.com/1-0-controller-API-td4571962.html
>
> I'm able to work around this using the audioamplify plugin for now,
> but it seems I'm still not getting the controller stuff to work. I
> don't think I'm grasping exactly how the whole controller thing works,
> despite taking a look at a design doc and a few code examples.
>
> What I'm trying to do is implement a smooth crossfade between two
> audio sources a few seconds before the end of the currently playing
> one. So I've set up control sources as above (save for using linear
> interpolation with audioamplify instead), and I've been trying to get
> the volumes to change using code like this:
>
> self.volume_1_cs.set(1 * Gst.SECOND, 1.0)
> ...and...
> successful, time = self.src_1.query_position(Gst.Format.TIME)
> self.volume_1_cs.set(time + (1 * Gst.SECOND), 0.0)
>
> The functions return true, so they say they're doing things, but I
> can't hear any difference. I just can't get my head around how this
> all works. Apologies if I'm just being dense.
>
>
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