Hi Sean, thank you for all that work.
Your prose description sounds OK. I think line 5 and 22 should not ignored opposite close far later TRUE ----p|--n-- This is lets say a Crossfader. The controller moves the Crossfader to p, Auto DJ takes over control, after Auto DJ is disabled, the user wants to quickly enable Deck B. This should work, since The Crossfader control will do exactly what the user whants without random jump. The same is valid in line 5 and 23 opposite far far later TRUE -p---|--n-- Line 10 and 11 can be split into two cases a) same close close xxxx FALSE ---pn|----- b) same close close xxxx FALSE ---np|----- a) is a slow move toward the Control value and b) is a slow move away from the CO value. b) works for me since the CO moves in a direction the user wants a) may not work, since the internal CO does a tiny (probably not notable jump) in a the opposite direction the user will likely move. This is part of the current implementation, maybe there is a reason for it. Line 13 and 24 same close far later TRUE -n--p|----- In our Crossfader example, the controller moves the Crossfader to p (almost centre), Auto DJ takes over control, after Auto DJ is disabled, the user wants to quickly enable Deck A. This should work here as well, since we have here no random jump as well. Line 14 and 15 same far close xxxx FALSE -p--n|----- The same question as for 10 a): Can we effort a small snap in jump in the opposite direction? Kind regards, Daniel Am 08.01.2016 um 22:17 schrieb Sean M. Pappalardo - D.J. Pegasus: > Hello everyone. > > In establishing tests for the soft-takeover algorithm, I realized that > its desired behavior needs to be explicitly defined. I would like to do > that via this thread to get consensus. This initial message is long to > acquaint you with all of the details. (As with many things in > technology, what is a simple concept is quite complex to implement > reliably.) > > The purpose of soft-takeover is given in our wiki > (http://mixxx.org/wiki/doku.php/midi_scripting#soft-takeover): > " To prevent sudden wide parameter changes when the on-screen control > [the value of the ControlObject] diverges from a hardware control, use > soft-takeover. While it's active on a particular parameter, manipulating > the control on the hardware will have no effect until the position of > the hardware control is close to that of the software, at which point it > will take over and operate as usual. " > > The algorithm works by looking at the previous and new values from the > hardware, how much time has passed between receiving these values, and > the current value of the ControlObject in question. I've constructed a > truth table that lists every possible combination and whether the new > hardware value in each case should be ignored or not. You can view it on > the Web here: > https://github.com/mixxxdj/mixxx/blob/master/src/test/SoftTakeoverTruthTable.csv > > - 'Sides' denotes if the previous and new hardware values are on the > same or opposite sides of the current CO value. > - 'prev distance' is whether the previous HW value is close to (within > 3/128 units) or far away from the current value of the CO. It's a way to > determine if the previous HW value affected the CO or not. > - 'new distance' is whether the new HW value is close to or far away > from the current value of the CO > - 'new value arrives' is whether the new HW value arrives soon after > (within 50ms) or some time after the previous HW value > - 'Ignore' is whether or not the new value should be ignored in this case > > The default action is to use the new hardware value (ignore == FALSE) > except when the new value is far from the current CO value. This is the > definition of an abrupt jump and the very thing soft-takeover seeks to > eliminate. > > What I'd like for everyone to do now is review that table. If you think > a particular combination is incorrect in (not) ignoring its new value, > please state which combination and why. > > > I will now do so here for my exceptions to the above-stated defaults > using text diagrams of a slider where p is the previous HW value, n is > the new one, and pipe (|) is the current CO value: > > opposite close far soon FALSE ----p|--n-- > Ordinarily this would be ignored due to the abrupt jump, but because the > new value arrives soon after the previous one and it crosses the current > CO value, the user is quickly whipping the control, so we should not > ignore the new value. > > opposite far far soon FALSE --p--|--n-- > Same reasoning as above. The crossing of the CO value and the speed at > which the new value arrives says this is a quickly-moving control so we > should not ignore the new value. > > same close far soon FALSE ---|p----n- > Even though it's an abrupt jump, since the previous HW value affected > the CO and the new value arrives soon after that, it's a quickly-moving > control so we should not ignore the new value. > > > Thank you for your attention and input. Once we nail down how > soft-takeover should behave, we can make sure the tests reflect that > behavior (then fix the algorithm if any fail.) > > Sincerely, > Sean M. Pappalardo > "D.J. Pegasus" > Mixxx Developer - Controller Specialist > > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > > > > _______________________________________________ > Get Mixxx, the #1 Free MP3 DJ Mixing software Today > http://mixxx.org > > > Mixxx-devel mailing list > Mixxx-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mixxx-devel > ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Get Mixxx, the #1 Free MP3 DJ Mixing software Today http://mixxx.org Mixxx-devel mailing list Mixxx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mixxx-devel
