hverkuil at xs4all
Jul 14, 2008, 3:08 AM
Post #2 of 2
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Re: default ctrls values not standard values?
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On Monday 14 July 2008 11:43:55 Martin Dauskardt wrote:
> I noticed that the ivtv driver uses some values that are different
> from the default settings. After loading ivtv v4l2-ctl
> --list-ctrls-menus says:
>
> spatial_luma_filter_type (menu) : min=0 max=4 default=0
> value=1 0: Off
> 1: 1D Horizontal
> 2: 1D Vertical
> 3: 2D H/V Separable
> 4: 2D Symmetric non-separable
> spatial_chroma_filter_type (menu) : min=0 max=1 default=0
> value=1 0: Off
> 1: 1D Horizontal
> temporal_filter_mode (menu) : min=0 max=1 default=0
> value=0 flags=update
> 0: Manual
> 1: Auto
> temporal_filter (int) : min=0 max=31 step=1
> default=0 value=8 flags=slider
>
>
> For the pvrinput vdr-plugin, we are currently detecting the
> default_value by using struct v4l2_queryctrl . Unless the user does
> not set other values, those detected values are used for initialising
> the card.
>
> At least in the three cases above, this leads to other values than
> the driver would have used by itself.
It's definitely a cx2341x bug. The defaults do not match the actual
defaults as cx2341x sets them up initially. Thanks for the report, I'll
fix this in the v4l-dvb tree.
> I always thougt that the default values come from c2341x, but the
> pvrusb2 driver gives other default values:
> video_aspect (menu) : min=0 max=3 default=0 value=1
> video_gop_closure (bool) : default=0 value=1
> audio_sampling_frequency (menu) : min=0 max=2 default=0 value=1
> audio_encoding_layer (menu) : min=0 max=2 default=0 value=1
> flags=update audio_layer_ii_bitrate (menu) : min=0 max=13 default=0
> value=10
This might well be a pvrusb2 bug. I'll take a look at this as well and I
might forward this message to the pvrusb2 mailinglist if it is indeed a
pvrusb2 bug.
> Obviously the card driver has its own default values, but uses
> different "standard" values after loading. So what is the sense of a
> default value if the driver sets another value by default?
None whatsoever :-)
> I wonder if I should use the current value given by v4l2_ext_control
> instead of the default values. But this values may have been changed
> by an application after loading the driver. So it can be used to
> reset settings.
>
> Is there any way to detect the "standard" value without reloading the
> driver and immidiately call its current values?
Not really. It's a true bug. Sorry.
Regards,
Hans
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