Hey,
On Wed, 24 Jun 2020, Sleep wrote:
> Why does the program below issue errors for
> snd_pcm_hw_params_set_period_size(), snd_pcm_hw_params_set_buffer_size(), and
> snd_pcm_hw_params_set_rate()? If I raise the value of SAMPLES to 768 it only
I highly recommend to review well known clients like aplay.c in alsa-utils
for reference.
E.g. here, it's not guaranteed all hardware drivers support all period
sizes. Typically you either use the ALSA plugin layer and not access hw
devices directly, and/or use the "_near" variants like aplay does:
aplay.c:
if (period_time > 0)
err = snd_pcm_hw_params_set_period_time_near(handle, params,
&period_time,
0);
... with _near(), you of course need to handle the case where the value
set doesn't exactly match what you requested.
Br, Kai
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