[Gambas-user] sound in gambas 3

[Dominique Michel]

Le Sat, 8 Feb 2014 19:36:49 +0100,
Fabien Bodard <gambas.fr at ...626...> a écrit :

> Is it a way to introspect the media lib ?

I use gst-inspect for that. I don't know if it is possible to do it in
Gambas. On my system:

 gst-inspect-1.0 audiotestsrc

As I understand the Media.control, it send the control name to
gstreamer, audiotestsrc in that case, together with the property it
want to control, "volume", "wave, ..., and its value.

gts-inspect will give you a description of all the properties and their
possible values.

Dominique

> 
> 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,
> >>
> >
> > ------------------------------------------------------------------------------
> > Managing the Performance of Cloud-Based Applications
> > Take advantage of what the Cloud has to offer - Avoid Common
> > Pitfalls. Read the Whitepaper.
> > http://pubads.g.doubleclick.net/gampad/clk?id=121051231&iu=/4140/ostg.clktrk
> > _______________________________________________
> > Gambas-user mailing list
> > Gambas-user at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gambas-user
> 
> 
>