[pulseaudio-tickets] [Bug 84585] Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #85 from Raymond <superquad.vortex2 at gmail.com> ---
does aplay work with non power 2 period size ?

aplay -v -D hw:0,0 --buffer-size=4408 stereo.wav


 1.102|   0.000) D: [pulseaudio] alsa-util.c: Trying hw:0 with
SND_PCM_NO_AUTO_FORMAT ...
(   1.106|   0.003) D: [pulseaudio] alsa-util.c: Managed to open hw:0
(   1.107|   0.001) D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 2972
ms
(   1.108|   0.001) D: [pulseaudio] alsa-util.c: Set buffer size first (to 4408
samples), period size second (to 1102 samples).
(   1.109|   0.001) I: [pulseaudio] alsa-sink.c: Successfully opened device
hw:0.
(   1.110|   0.000) I: [pulseaudio] alsa-sink.c: Selected mapping 'Analog
Stereo' (analog-stereo).
(   1.110|   0.000) I: [pulseaudio] alsa-sink.c: Device doesn't support mmap(),
falling back to UNIX read/write mode.
(   1.110|   0.000) I: [pulseaudio] alsa-sink.c: Cannot enable timer-based
scheduling, falling back to sound IRQ scheduling.
(   1.112|   0.001) I: [pulseaudio] alsa-util.c: Successfully attached to mixer
'hw:0'


it is strange that mmap is not supported


it is no easy to find a fragment time which can be converted to power two
period size

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