<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div id="yiv3480874963"><div><div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:12pt;"><div id="yiv3480874963yui_3_7_2_35_1369836963898_55"><span><br></span></div><div><br id="yiv3480874963yui_3_7_2_35_1369836963898_57"></div> <div class="yiv3480874963yui_3_7_2_35_1369836963898_59" id="yiv3480874963yui_3_7_2_35_1369836963898_60" style="font-family:arial, helvetica, sans-serif;font-size:12pt;"> <div id="yiv3480874963yui_3_7_2_35_1369836963898_73" class="yiv3480874963yui_3_7_2_35_1369836963898_63" style="font-family:times new roman, new york, times, serif;font-size:12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> katja <katjavetter@gmail.com><br> <b><span style="font-weight:bold;">To:</span></b> Jonathan Wilkes
<jancsika@yahoo.com> <br><b><span style="font-weight:bold;">Cc:</span></b> "pd-dev@iem.at" <pd-dev@iem.at> <br> <b><span style="font-weight:bold;">Sent:</span></b> Wednesday, May 29, 2013 1:12 PM<br>
<b><span style="font-weight:bold;">Subject:</span></b> Re: [PD-dev] jack dbus?<br> </font> </div> <div id="yiv3480874963yui_3_7_2_35_1369836963898_72" class="yiv3480874963y_msg_container"><br>[...]<br><br>>I know only one way at the moment: routing Pulseaudio through JACK,<br>>equivalent to how Pd is routed through JACK. If this is called<br>>'Pulseaudio on top of JACK', then 'yes'. The extra latency is because<br>>I need to set 2 periods of 512 samples (23 ms) for JACK's buffering to<br>>get audio without dropouts in this setup. In Pd I have it fixed at 15<br>>ms. In practice there are more causes for latency, so I measure<br>>roundtrip latency in Pd with a sample-precise routine (see attached<br>>patch 'latency-tester2.pd'). Pd's 15 nominal ms is in practice 18 ms<br>>when routed directly via ALSA. Via the JACK + Pulseaudio setup it is a<br>>total of 50 ms in practice.<br><br>There's no other combination of frames/period
and period/buffer you<br>can use to get ca. 17-20ms latency without dropouts?<br><br>>By the way this does of course not say anything about latency in<br>>Pulseaudio. Maybe there is a way to test that with a 'pulsified'<br>>application, for example Audacity.<br><br>That would be interesting to see.<br><br>-Jonathan<br></div> </div> </div> </div></div></div></div></body></html>