On Fri, 13.06.08 18:26, Takashi Iwai (tiwai@xxxxxxx) wrote: > Wait, wait. Please don't mix up. The above doesn't imply anything > about the further implementation of usb-audio driver. What I > suggested is, instead of hiding two pointers (hw_ptr and curr_ptr) and > creating a complex API, simply expose them. > > Now, regarding the usb-driver. Honestly, I don't understand what you > want to do with an extra URB. > > As now, usb-audio driver handles as curr_ptr == hw_ptr. But, in > reality, curr_ptr = hw_ptr - samples_in_urbs. So, in the case > of USB-audio, hw_ptr is ahead of curr_ptr. (And the granularity is > samples_in_urbs). BTW: what's the relation between periods and URBs on usb-audio right now? I mean, the URBs should be exposed as periods to userspace, right? But they are not right now, are they? I mean, I can set all kinds of strange period settings for my USB device and I am pretty sure that this is not reflected in the URB size, or am I wrong? Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
