[ALSA] usb-audio: optimize handling of capture URBs

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USB generic driver
When preparing capture URBs, we don't need to stop when we cross a
period boundary because we now never handle more than one millisecond of
data per URB anyway.

When handling captured data, use an extra flag to call
snd_pcm_period_elapsed() no more than once.  This allows us to move the
period boundary checking code before the copying of the data which
avoids a second locking of the substream's lock.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

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Clemens Ladisch 2005-08-15 08:22:39 +02:00 • committed by Jaroslav Kysela

parent 99250872fc

commit b263a9bdf9

1 changed files with 8 additions and 18 deletions

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sound/usb/usbaudio.c

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