On Tue, 07 Aug 2018 15:12:08 +0200, Chakravarthi Pradeep wrote:
Dear Takashi,
Thanks for your reply.
The "period" in ALSA PCM definition represents the interval time (or frames) of the periodical interrupts on the ring buffer. If the irq is issued for each 256 frames while the ring buffer size is 1024 frames, periods = 1024/256 = 4. The periods_min defines the minimal number of periods the hardware may accept.
Is it 256 frames or 256 bytes ?
In the case above it's in frames. But it can be defined in bytes depending on the hardware spec. Some hardware defines in the time unit (like msec), too.
fuser -v /dev/snd/* output is USER PID ACCESS COMMAND /dev/snd/controlC0 Dell 1815 F..... pulseaudio
Now you know it. And remember that PA is often die-hard.
Takashi