[alsa-devel] snd_pcm_runtime.buffer_size question

hi all, i am currently fighting with the snd_pcm_runtime.buffer_size. how is the value defined?

i would expect: channels * periods * period_size * sample_bits/8 (in my case 64*5*128*3)

however in the code, i am working on, it seems to be: periods * period_size (in my case 5*128)

am i missing something obvious?

thanks, tim