[alsa-devel] Status of snd_pcm_rewind()

Lennart Poettering mznyfn at 0pointer.de
Mon Jan 7 16:14:58 CET 2008

On Mon, 07.01.08 15:06, Takashi Iwai (tiwai at suse.de) wrote:

> At Sat, 22 Dec 2007 19:33:01 +0100,
> Lennart Poettering wrote:
> > 
> > Hi!
> > 
> > What's the status of snd_pcm_rewind()? Is it available on all devices?
> It should work on all "hw" PCM, but not via every plugin.  The
> functionality is basically in the PCM core level, independent from
> the lowlevel driver implementation.
> dmix and dshare don't work (unimplemented).  The other plugins should
> work, though.
> > I assume not (at least dmix doesn't...). But I guess I can safely
> > assume it is available when mmap is used? Is there any API function to
> > test if it is available?
> No, unfortunately.  A self-test?

Ii assume th "No" is a response to the question if there was any API
function to test whether it is available, right?

What's the answer to the question that I can safely assume that it is
available when mmap is used?

May I suggest adding an API function that can be used to detect
whether _rewind() functionality is available?


Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

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