[Gambas-user] sound in gambas 3

[Fabien Bodard]

Is it a way to introspect the media lib ?

I mean

For each s in Media.ControlList
  hMedia = MediaControl($hcont, s)
  for each sprop in hMedia


  next


next

get props and signatures... like for dBus.


2014-02-08 19:41 GMT+01:00 Dominique Michel <dominique.michel at ...3298...>:
> Le Sat, 08 Feb 2014 03:33:34 +0100,
> Benoît Minisini <gambas at ...1...> a écrit :
>
>> Le 08/02/2014 02:04, Benoît Minisini a écrit :
>> > Le 08/02/2014 01:24, Dominique Michel a écrit :
>> >> Hi,
>> >>
>> >> I try to do my first gambas program, and I am stuck with the sound.
>> >>
>> >> All I have for now is 2 labels, 2 value boxes and 1 toggle button.
>> >>
>> >> When I press the toggle button, it launch a message box with the 2
>> >> values in the value boxes and some text. 1 is a frequency, the
>> >> other is the amplitude. I want to use these values to make some
>> >> sounds.
>> >>
>> >> When looking for sound functions, I found Play in sdl.sound. Is it
>> >> possible with it, or with another function, to use something like:
>> >>
>> >> Play frequency volume
>> >>
>> >> Another way would be to create an audio file on the fly...
>> >>
>> >> Dominique
>> >>
>> >
>> > You must use gb.media, which is the interface to gstreamer.
>> > GStreamer has a plugin for generating sinusoidal sounds (its name is
>> > "audiotestsrc", look at the GStreamer documentation for the
>> > details).
>> >
>> > Regards,
>> >
>>
>> I made an example of that for you in revision #6140.
>
> Thanks a lot! I see it is possible to use the other properties like
> wave for the waveform. Gambas is amazing and very powerful.
>
> When modifying the volume control to have the label in dB, I see that a
> formula like
>
>         SetFreq(Exp(Log(20) + (Log(20000) - Log(20)) *
>         sldFrequency1.Value / 1000))
>
> doesn't give an error when sldFrequency = 0, but a formula like
>
>          lblVolume1.Text = Format((20 * Log10(fVol / 1000)), "0.00") &
>          " dB"
>
> give an error when fVol = 0. I don't understand why it work in the
> first case but not in the second case.
>
>
> Best Regards,
>
> Dominique
>>
>> Regards,
>>
>
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-- 
Fabien Bodard