On Thursday 23 July 2009 20:46:49 Tiago Salem Herrmann wrote: > Hi, > > In order to be able to send voice clips in WLM I need to capture sound > from a microphone. > I've been searching how to do this using phonon, but as far as I can see > there is still no support for sound capture. > Does anyone have an idea on how I could do that in a good way and > platform-independent? > Is portaudio (www.portaudio.com) a good option?
It can be, GStreamer is the best option currently, I think.
The problem won't be cross platform, it will be Linux. Linux has multiple
multimedia frameworks (GStreamer, PulseAudio, Jack,...) but some sound cards
allow only 1 application to use it at a time. That means that if Kopete uses
Portaudio and KNotify uses Phonon with GStreamer, one of them won't be able to
play anything.
Why I think GStreamer is the best is because
(1) it's one of the engines used by Phonon and
(2) most linux applications are using GStreamer.
I hope Phonon will have support for audio Input and audio output from a buffer
soon.
Justin McPherson who works at Qt Software is working on Phonon to make it
access the sound card directly (dropping media engines like GStreamer and
Xine) but I haven't heard from that since some time now.
But once again, programs using Phonon and programs using GStreamer will fight
to have access to the sound card. The main argument for developping Phonon is
that when you use Qt based applications (and so Phonon based), you should'nt
use GStreamer based applications at the same time.
This problem does not appear under Windows because all applications should use
DirectX to deal with the sound card. Even GStreamer uses DirectX under
Windows.
But well, GStreamer is platform independant, very powerfull and is the most
used.
If you want an examaple library, see psimedia :
http://delta.affinix.com/psimedia/
Cheers,
Detlev.
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