At 00:04 on Thu, Jul 26 2018, Takashi wrote: >> Is it required that all available data has been committed between calls >> to snd_pcm_ioplug_avail_update() on an IO plugin capture stream? > > Yes, the capture data is committed. > The snd_pcm_ioplug_hw_ptr_update() should have reported the amount of > data the slave PCM can actually transfer. Hence the transfer call > thereafter must fulfill the whole requested data. But what I see is that snd_pcm_rate_avail_update() commits data in the slave PCM in units of slave->period_size (via snd_pcm_rate_grab_next_period()), which means that if there is a partial period in the slave PCM mmap it will not be committed. In other words, not all the available data will be commmitted before the next call to snd_pcm_ioplug_avail_update(). This means that the data will be discarded the next time that snd_pcm_ioplug_avail_update() is called. Rob. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
