2010/2/10 Clemens Ladisch <clemens@xxxxxxxxxx> > Raymond Yau wrote: > > ... > > The rest of those sound cards which have period_mins = 1 are regarded as > > broken by PA developer (e.g. intel8x0 ,emu10k1 , ens1371 , ... ) and > aplay > > did not work with one period per buffer too. > > > > what is the hardware requirement for the driver to support one period per > > buffer ? > > That the hardware can be programmed to generate only one interrupt per > buffer. > > > if none of the those driver can be fixed > > why don't we change the period_min of all those broken drivers from 1 to > 2 > > ? > > Because period_min has nothing to do with the brokenness. PA wants to > use as few periods as possible because it does not use period interrupts > but the DMA pointer, and it's the latter that is broken. > > > Regards, > Clemens > Are the one period per buffer designed for specific purpose such as playing/looping the pre-loaded soundfont ? Other than pulseaudio , are there any application use this mode properly without glitch ? Do you mean that PA only wake up once when configure sound card to use two periods per buffer ? if sound card only support non-interleaved mode and exactly two periods , even if you limit the rewind of application pointer to the period boundary is not 100% safe if the sound card pre-fetch audio using DMA Most sound cards hardware register only provide the number of sample processed _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
