[pulseaudio-discuss] [PATCH] [alsa] add rewind-safeguard parameter

Lennart Poettering lennart at poettering.net
Fri May 7 16:50:23 PDT 2010

On Thu, 29.04.10 11:14, pl bossart (bossart.nospam at gmail.com) wrote:

> This is a patch to fix rewind issues. It has the potential to break
> audio in Linux, so I would really appreciate it if others could give
> it a try and test on their systems. The new rewind_safeguard should be
> tuned to the DMA burst size plus some headroom; I chose a default
> value of 256 bytes but some exotic embedded hardware might require a
> different setting. On my HDAudio test system, 128 bytes was already
> more than enough to prevent audible noises.
> Thanks for your feedback.

Hmm, I had to think about this a bit, but I do agree now that this is a
good thing.

In the long run, this should probably be done by ALSA (or at least tuned
to some value reported by ALSA), but the patch makes a lot of sense to
me, and certainly more sense that the watermark value that we currently
stay away from the write index.

So, I decided that the code is good and suitable for master and have
hence commited it. I don't expect problems with it, but we can still
change it later on if there turn out to be problems.



Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

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