Parsing caps

[Ilya Aleshkov]

Hi Michael,

Thank you so much! This is exactly what i'm looking for.

Ilya

On Thu, Jan 17, 2019 at 8:17 PM Michael Gruner <michael.gruner at ridgerun.com>
wrote:

> Hi Iiya
>
> You can try gst_value_get_fraction_range_min
> <https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstValue.html#gst-value-get-fraction-range-min>
>  and gst_value_get_fraction_range_max
> <https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstValue.html#gst-value-get-fraction-range-max>,
> where the GValue returned is of type GST_TYPE_FRACTION_RANGE.
>
> Michael
> RidgeRun
>
> On Jan 17, 2019, at 10:59 AM, Ilya Aleshkov <ilya.aleshkov at gmail.com>
> wrote:
>
> Hi,
>
> I'd like to parse GstCaps. It's pretty trivial:
>
> GstDevice *device = ... // Get "Video/Source" devices from GstDeviceMonitor
>
> GstCaps *devCaps = gst_device_get_caps(device);
> uint size = gst_caps_get_size(devCaps);
>
> for (uint i = 0; i < size; ++i) {
>     GstStructure *s = gst_caps_get_structure(devCaps, i);
>     GType framerate = gst_structure_get_field_type(s, "framerate");
>     qDebug() << g_type_name(framerate);
>       ...
> }
>
> Output: GstFraction or GstFractionRange
>
> I can easily get a fraction with:
>
> gst_structure_get_fraction(s, "framerate", &numerator, &denominator)
>
> But there is no such method for a fraction range.
>
> I can get a GValue for a fraction range:
>
> GValue *fractionRange = gst_structure_get_value(s, "framerate");
>
> But I don't know how to extract a range from it.
>
> What did I miss?
>
> Thanks,
> Ilya
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>
>
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