Legality of certain gst_device_get_caps results

[Gottfried Haider]

Hi Tim,

Thanks a lot, that clears it up!

Best
Gottfried

On Sat, Nov 12, 2016 at 6:34 PM, Tim Müller <tim at centricular.com> wrote:
> On Sat, 2016-11-12 at 18:14 +0100, Gottfried Haider wrote:
>
> Hi Gottfried,
>
>> I am getting the caps of attached capture devices in C
>> [gst_device_get_caps], turn them into a string [gst_caps_to_string],
>> and pass them on to Java, where I am again parsing the string.
>>
>> When I am looking at the Raspberry Pi Camera, which is attached via a
>> V4L2 driver, I am seeing properties such as these ones, which my
>> naive code stumbles upon:
>>
>> width=(int)[ 32, 3280, 2 ]
>> height=(int)[ 32, 2464, 2 ]
>> framerate=(fraction)[ 1/1, 90/1 ]
>>
>> Besides the framerate (whose values also look a bit odd to me):
>
> What's odd about the framerate? It's a range and means 1 fps is the
> smallest value and 90 fps is the largest value that can be requested.
>
>> are those values legit? How should I interpreting them? (previously I
>> always saw singular values for width & height)
>
> They are. Usually you only see e.g.  width=(int)[ 32, 3280] which is a
> range with all values from 32 to 3280 inclusive allowed.
>
> In this case width=(int)[ 32, 3280, 2] is a range with all *even*
> values from 32 to 3280 inclusive allowed, 2 is the "step" of the range
> here which is omitted if it's 1.
>
> Cheers
>  -Tim
>
> PS: there's also https://github.com/thaytan/gst-rpicamsrc fwiw, which
> uses the mmal API directly.
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com
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