I'll see if I can get master_sync in slightly better shape. Right now when it starts up, all decks are set to slave mode and the master block is set to 124 bpm (and you can't change it). the "beat" message is the master clock reporting each downbeat.
Like I said, this branch is still early work and is not for general consumption. owen On Mon, 2012-05-28 at 01:48 -0400, Eric Van Albert wrote: > I can't seem to get the master_sync branch to run, the GUI won't load > and the console just says "beat" repeatedly. > > - Eric Van Albert > ervan...@mit.edu > > > > On Sun, May 27, 2012 at 2:17 AM, Sean M. Pappalardo - D.J. Pegasus > <spappala...@mixxx.org> wrote: > Hello, Eric. > > > On 05/27/2012 02:07 AM, Eric Van Albert wrote: > I noticed there's been some talk about adding a MIDI > clock output to > mixxx. I am planning a show in about 3 months for > which this would be a > very desirable feature. > > I was wondering what work has been done on it so far. > I would be willing > to implement it myself but don't know where to start > in the mixxx codebase. > > > Right now, since Mixxx doesn't yet have a master clock > internally (that's addressed in blueprint > https://blueprints.launchpad.net/mixxx/+spec/master-clock) the > only thing we can do is send a MIDI clock signal based on the > BPM of the currently-loaded track, so each deck will send its > own MIDI clock signal. (That will confuse the heck out of > dual-deck controllers that pay attention to that signal.) > > > I would be willing to help implement the feature > "officially" if specs > have been laid out. If not, is there a simple hack > that I can do quickly > on my local copy, or even something with the MIDI > controller scripting? > > > The script engine's context won't be reliable enough to > deliver a precise clock signal. This would need to be done in > MidiController.cpp. > > I just created a blueprint for this. > https://blueprints.launchpad.net/mixxx/+spec/midi-beat-clock > > I started thinking of how to implement this while creating > that, and we're going to have a problem with clock drift > because we don't currently have a timing source with > microsecond precision. (Since there are 24 clock pulses per > beat, 120BPM is a clock pulse every 20833us, 150BPM is every > 16667us and so on.) QTimers only have millisecond precision > and may fire late. So even if they were on time, they could > only accurately represent 78.125BPM (32ms), 100BPM (25ms), > 125BPM (20ms), 156.25BPM (16ms), 250BPM (10ms), etc. Other > whole ms values translate to fractional BPM values. (If you > want to make your own spreadsheet, the formula is (1/(<timer > value in ms>/1000))/24*60 ) > > On top of this, even the beat_active CO (which we would sync > to on each beat) is only accurate to 50ms according to the > Wiki. > > So the question is: would a MIDI clock signal even be useable > given this level of inaccuracy? > > Sincerely, > Sean M. Pappalardo > "D.J. Pegasus" > Mixxx Developer - Controller Specialist > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ 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 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ 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
