This patch fixes the hw_params restrictions when first (or playback) stream
sets the final hardware parameters. Also, fix the hw_params checking
in the trigger callback.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

Simple coding fix.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

In a special case, some old samples are left in the capture ring buffer.
Fix it.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

Obvious copy-and-paste error.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

The snd-aloop module allows redirecting of the PCM playback in the
kernel back to the user space using the standard ALSA PCM capture API.

The module also allows time synchronization with another timing source
and notifications of playback stream parameter changes.
Signed-off-by: NJaroslav Kysela <perex@perex.cz>