Hi Katsuhiro > >> Bad scenario as follows (mclk-fs = 256): > >> - Initialize sysclk by correct value (Ex. 12.288MHz) > >> - Codec set constraints of PCM rate by sysclk > >> 48kHz (1/256), 32kHz (1/384), 24kHz (1/512) > >> - Play 48kHz sound, it's acceptable > >> - Sysclk is not changed > >> > >> - Play 32kHz sound, it's acceptable > >> - Set sysclk to 8.192MHz (= fs * mclk-fs = 32k * 256) > >> - Codec set constraints of PCM rate by sysclk > >> 32kHz (1/256), 21.33kHz (1/384), 16kHz (1/512) > >> > >> - Play 48kHz again, but it's NOT acceptable because constraints > >> do not allow 48kHz (snip) > Ah, sorry for confusing. It's not either. hw_params() of machine > driver has been called even if constraints don't have a requested > PCM rate. But it's not expected. > > For example, if constraints are 32k, 21.33k, 16k, hw_params() will > be called with 32k when an user requests to play 48k sounds. Oh, I see. Thank you for explaining. Thank you for your help !! Best regards --- Kuninori Morimoto _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
