At Mon, 7 Jan 2008 16:14:58 +0100, Lennart Poettering wrote: > > On Mon, 07.01.08 15:06, Takashi Iwai (tiwai@xxxxxxx) 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? Right. > What's the answer to the question that I can safely assume that it is > available when mmap is used? If I understand correctly -- mmap of the "hw" PCM, then yes, it's always supported. (Note that you can still do mmap-alike over any plugins) > May I suggest adding an API function that can be used to detect > whether _rewind() functionality is available? Adding it would be easy, but I'm a bit worrying about blindly addition. Implementing rewind on dmix would be a better option, but it seems difficult because of its design... Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
