Yes
2016-04-14 15:07 GMT+02:00 Cole Bush <bus...@husky.neu.edu>:
> So if I have the bus receiving messages from spectrum, would i get the
> "magnitude" of the FFT with
> message->get_structure()->get_field("magnitude", mags_by_ref)?
>
> Thanks!
>
> On Wed, Apr 13, 2016 at 7:30 PM, Marcin Kolny <marcin.ko...@gmail.com>
> wrote:
>
>>
>>
>> 2016-04-14 1:09 GMT+02:00 Cole Bush <bus...@husky.neu.edu>:
>>
>>> Hello,
>>>
>>> I am creating a gstreamermm pipeline that uses the "good" spectrum
>>> <https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-spectrum.html>
>>> plugin
>>> to perform a fft on the audio. I think I have the pipeline working
>>> correctly (it plays the file) and I am recieving messages on the bus, but I
>>> don't know how to get the information from it. Firstly, is this the correct
>>> way to initialize it?
>>>
>>> Glib::RefPtr<Element> spectrum;
>>> spectrum = ElementFactory::create_element("spectrum");
>>> spectrum->property("post-messages", true);
>>> spectrum->property("bands", 20);
>>> spectrum->property("threshold", -80);
>>>
>>> Should it be a RefPtr to an Element or AudioFilter?
>>>
>> It can be either Element or AudioFilter. As long as you don't need any
>> AudioFilter-specific feature, you can use Element class.
>>
>>
>>>
>>> Second, in my bus message listener I have a case for a message type of
>>> Gst::MESSAGE_ELEMENT which then calls a function to get the info:
>>> "decode_spectrum(const RefPtr<Message> &message);" How do I get info like
>>> the name (should be "spectrum")
>>>
>> Since you didn't specify element name in your code, it'll be
>> autogenerated and you can get the name by calling:
>> spectrum->get_name();
>> If you want to explicitly specify the name, you should use method:
>> https://developer.gnome.org/gstreamermm/stable/classGst_1_1ElementFactory.html#a6a85a2a3c4f69383cad2686d381e10e9
>>
>>
>>> and the data (magnitude in dB)?
>>>
>> You'd have to use Gst::Structure::get_field() method.
>>
>>>
>>>
>>> Thanks for any insight!
>>>
>>> _______________________________________________
>>> gtkmm-list mailing list
>>> gtkmm-list@gnome.org
>>> https://mail.gnome.org/mailman/listinfo/gtkmm-list
>>>
>>>
>>
>>
>> --
>> Best regards,
>> Marcin Kolny
>>
>
>
--
Best regards,
Marcin Kolny
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