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[Qemu-devel] esd audio output patch and debuging.
From: |
Frederick Reeve |
Subject: |
[Qemu-devel] esd audio output patch and debuging. |
Date: |
Wed, 30 Aug 2006 10:45:49 -0500 |
Hello.
Attached you will find a patch for esd audio support in QEMU. It is more or
less a large modification of audio/wavaudio.c. The patch will apply against the
latest tarball release http://fabrice.bellard.free.fr/qemu/qemu-0.8.2.tar.gz
(0.8.2 at the time of this writing). You will of course need libesd to compile
this. To apply and test on linux/*nix simply:
$ cd qemu-src-dir
$ patch -Np1 -i path/to/patch/file
$ ./configure --enable-esd
$ make
$ sudo make install
$ export QEMU_AUDIO_DRV=esd
$ qemu (your options here) -soundhw es1370
You will also need to make sure esd is running when you do that of course.
Sorry if that is insulting your intelegence. I just wanted to make everything
very clear.
Now, I would not have you thinking this patch is a ready to go. I am writing
this email because I am having a little trouble with this. It outputs sound
fine but it produces artafacts. I'm not sure of the cause. Though I think it
may have to do with frame alignment or with the conversion process (see code).
It sounds like its clipping at high sample volume but this is the first time I
have done anything with audio programing. I had planed to submit a completed
patch but... anyway if anyone can point me in the right direction I would
appreciate it. Alternately if you just want to fix it that would be great to.
:-)
Just a note also on esd as far as I can tell it only supports 8 and 16 bit
unsigned.
You may be wondering why with all the sound support options qemu has that I
would want to write another one. Here is the logic. I am running an LTSP
server setup. The servers I use have no sound card at all. Yet all the
programs run on that server. The clients however have sound cards. None of
QEMUs sound outputs will work without a sound card with the exeption of wav.
None of QEMUs sound outputs can be broadcast over a network to clients but esd
can. In short esd support allows me to run many QEMU copies on a server and
output the audio to client terminals with out the server even having a sound
card. esd is old but its about the only well supported option for network
audio output in both linux distros and LTSP.
Background: I am maintaining LTSP servers for small elementy schools with "no
budget". I currently maintain these networks for free to help with education
though they may be offering me a job in the future. The teachers require a
small few windows programs that do not run under wine. So I pipe qemu over the
thin terms and use gdm so when they log into a qemu session it just pulls up
windows full screen. Howerver they have resently needed sound and yes they
actualy need it (though I whish I could say they didn't). School will be
starting on september 4 and I am trying to be ready.
Anyway if you have any questions or I can help at all let me know.
If you can see what is wrong or have sugestions I welcome help. Also if you
know of a better way that I would be happy to here it but after looking at our
situation I think this sound module is the path of least resistance.
I thank you also for QEMU it has been a huge boon to the schools.
Thanks
Frederick
qemu-0.8.2-esd.patch
Description: Binary data
- [Qemu-devel] esd audio output patch and debuging.,
Frederick Reeve <=