________________________________ From: katja <katjavet...@gmail.com> To: Jonathan Wilkes <jancs...@yahoo.com> Cc: "pd-dev@iem.at" <pd-dev@iem.at> Sent: Wednesday, May 29, 2013 1:12 PM Subject: Re: [PD-dev] jack dbus? [...] >I know only one way at the moment: routing Pulseaudio through JACK, >equivalent to how Pd is routed through JACK. If this is called >'Pulseaudio on top of JACK', then 'yes'. The extra latency is because >I need to set 2 periods of 512 samples (23 ms) for JACK's buffering to >get audio without dropouts in this setup. In Pd I have it fixed at 15 >ms. In practice there are more causes for latency, so I measure >roundtrip latency in Pd with a sample-precise routine (see attached >patch 'latency-tester2.pd'). Pd's 15 nominal ms is in practice 18 ms >when routed directly via ALSA. Via the JACK + Pulseaudio setup it is a >total of 50 ms in practice. There's no other combination of frames/period and period/buffer you can use to get ca. 17-20ms latency without dropouts? >By the way this does of course not say anything about latency in >Pulseaudio. Maybe there is a way to test that with a 'pulsified' >application, for example Audacity. That would be interesting to see. -Jonathan
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