Hello,
I was assuming that using poll (snd_pcm_wait), with the
alsa-lib/test/latency.c program would have snd_pcm_read
return period size samples at a time, but this is not
the case.
As far as I understand, the problem is that in the following
code:
val = !block ? 4 : snd_pcm_hw_params_get_period_size(params, NULL);
if (tick_time_ok > 0)
val = 16;
err = snd_pcm_sw_params_set_avail_min(handle, swparams, val);
val = 4, instead of snd_pcm_hw_params_get_period_size(params, NULL);
(because with poll, block = 0)
Is there any reason for this? Wouldn't it make more sense to
simply do
val = snd_pcm_hw_params_get_period_size(params, NULL);
err = snd_pcm_sw_params_set_avail_min(handle, swparams, val);
So, is my assumption wrong, or is the code wrong? If my assumption
is wrong, could you explain me why it is better/more logical that
the latency test is polling for very small buffers, instead of the
latency?
Maarten
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