I am at my wits end trying to figure out how period_size is being calculated in pcm_native layer based on period_size and period_count being set by the userspace.

I am using tinycap to capture the audio and setting below settings: bitwidth = 16 rate = 16000 channel = 1 period_size = 320 period_count = 2

I am wondering how is below period_size and buffer_size calculated?

Shouldn't period_size of 320 bytes and period_count of 2 fail?

cat sub0/hw_params

access: RW_INTERLEAVED format: S16_LE subformat: STD channels: 1 rate: 16000 (16000/1) period_size: 2042 buffer_size: 4084

And this is my settings in pcm_hardware structure: static struct snd_pcm_hardware s1000_pcm_hw = { .buffer_bytes_max = 1024*1024, .period_bytes_min = 4084, .period_bytes_max = (1024*1024)/2, .periods_min = 2, .periods_max = 32, };