On Sun, 4 Jan 2004, Florian Schmidt wrote:
On Sun, 04 Jan 2004 00:07:26 -0500 Paul Davis <[EMAIL PROTECTED]> wrote:
I'm working on changing DMIX to allow clients to open the capture
stream.
i don't get it. dmix is for playback, not capture. what would be the semantics of this?
Hmm, i don't know the OP's answer to this, but i like to ask a very related question:
It is possible to create a playback pcm device with the help of the dmix plugin. This way several apps can playback at once - nice. But now what about using two apps that do full duplex at the same time?
This is exacly my point. The fact that dmix and dsnoop are half-duplex is
where I have a problem. There seems to be no way to allow more than one
OSS-compatibility client to share audio in a satisfactory way. Which is
to say, you can have two doing playback, or two doing capture, or maybe
one each (haven't tried yet), but you can't do two full-duplex, or one
full-duplex and one capture or playback. This is a bug in my opinion. It seems to me that this issue is not addressed by anyone, and that's why I started this code change, to allow capture to "pass through" so that one client can do full-duplex with multiple other clients still able to playback. This is not too much to ask IMHO.
Recent discussion of this has made it clear that in the near future Jaroslav and Takashi are planning on implementing better interoperability between dmix and dsnoop.
It's not high on the list of priorities because there are already other software mixing apps/deamons that work. It is high on the list of desired features though :)
As you have found out the changes required are not superficial but require advanced understanding of ALSA internals.
dmix and dsnoop are less than a year old and there are still apps that don't provide correct support for them. If you can't wait, you could try to use JACK, artsd, gstreamer....
-- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ========================================
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United Press International Rockets on donkeys hit major Baghdad sites
By P. MITCHELL PROTHERO Published 11/21/2003 11:13 AM
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