Am 19.09.2013 10:46, schrieb Patrick Shirkey: > Moving this thread to LAU as it seems to be a more generic issue now: > > I am testing the round trip latency when using PA and JACK together. I > have the following connection graph: > > jack_system (in) -> pa_source (in) -> audacity (in) -> audacity (out) -> > pa sink (out) -> jack_system (out) > Unless your research is completely academic I do not see a practical use for its results on the user-side. For Audacity latency is not a big issue. It does not build for realtime-application rather for offline editing, audio-restauration etc, in that field a latency of 100ms is still OK.... > Audacity is run in pass through mode with internal latency set to 0. > > I would like to measure the round trip latency from jack_system (in) to > jack_system (out) > > This is a slightly unusual request but it is actually a reasonably > important measurement in the bigger scheme of things. > > Does anyone have any suggestions? > > Ideally I would like to get accurate measurements for both input and > output latency. > > input: > jack_system (in) -> pa_source (in) -> audacity (in) > > output: > audacity (out) -> pa sink (out) -> jack_system (out) > > So a tool that allowed me to measure the latency between every node on the > graph would be perfect. > > Obviously made alot harder by mixing PA and JACK together. I have tried > jack_iodelay but it does not measure the input signal from the mic instead > it provides it's own signal. > > I suppose I could modify jack_iodelay to accept an input signal as the > starting point for the latency graph but I have not looked into the code > yet to see how tricky that would be. > > > > -- > Patrick Shirkey > Boost Hardware Ltd > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user > > _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
