Awesome news,
had some difficulties loading tracks to deck when using with an existing
database, but it works when starting with a fresh db.
Just some questions to understand the implementation better:
* How accurate/performing is QM <> libkeyfinder?
* What if a user wants to use the traditional notation?
Can we add that to the preferences as well without having to duplicate it in
the Custom notation pane?
* Do we know if using the "Lancelot" notation preset is ok?
* What if there are already keys present in the tracks metadata?
* Is there code in place to write notations to file?
If so, where we are going to write the notations (.e.g INITIALKEY, GROUPING,
...)
Possible bugs:
* The new pitch control does change the playback rate of the track too, while
it is supposed not to.
jus
On Sunday, May 5, 2013 at 7:15 AM, RJ Ryan wrote:
> Hi all,
>
> I've taken Varun's GSoC work from last summer and done some surgery on it.
> The result is looking promising and is just about ready to merge to trunk.
>
> https://code.launchpad.net/~mixxxdevelopers/mixxx/features_key
>
> I'm ready to reach out and get your feedback! Experimental builds are here:
> Ubuntu and Mac:
> http://builds.mixxx.org/builds/experimental-features_key/r3062/
> Windows will show up here (there was a problem w/ r3062)
> http://builds.mixxx.org/builds/experimental-features_key/r3064/
>
> This introduces a new database revision, #18. Please make a backup of your
> database first. Since this is ready to merge to trunk I will probably
> cherry-pick this revision into trunk so we don't have to worry about someone
> else creating a revision 18. But just to be safe, I would backup your
> library.
>
> New features:
>
> * Automatic key detection on your tracks using the Queen Mary key detector
> VAMP plugin. (The plugin is selectable just like for the beat detector so we
> can add KeyFinder support trivially. The QM key detector was already in our
> current plugin set so it made sense to turn that on first.).
>
> * Full list of key changes is stored and a global key is calculated by the
> most dominant key (the key the track was in for the longest amount of time).
> We can play with other methods of calculating the global key later. The full
> list of key changes is stored in the database just like the full list of
> beats is for beat detection.
>
> * New "pitch" control that allows you to change the pitch of a song
> independent of its tempo/rate. This is measured in octaves of change. A value
> of 1 means a full octave pitch shifted up while a value of -1 means a full
> octave pitch shifted down.
>
> * A <Key> widget in the skin that shows you the current effective key of a
> deck. For example, if a track's key is C and it is pitch-shifted up by one
> 1/12 of an octave then the key widget shows C#.
>
> * Key preferences pane has support for key notations. You can choose which
> key notation you would like Mixxx to use for your tracks. The built-in
> notations are OpenKey and Lancelot notation (A notation that I came up with
> based on the Circle of Fifths). If you select a custom notation then you can
> provide a custom string for each key.
>
> * Mixxx tracks the symbolic/semantic key internally so changing key notation
> is nothing but a rendering/text display change. So if you change your
> notation, all key display throughout Mixxx will change. Tracks that were
> analyzed when you chose the old notation will update to have the new
> notation. Even tracks that had keys read from their ID3 tag will change.
> (Note, this is just internal to Mixxx -- we still don't touch your file's ID3
> tags).
>
> * In the library key column, you can enter keys in any notation Mixxx
> supports. For example, you can type C# minor as either "C#m", "c", "12a"
> (lancelot), or "5m" (openkey) and Mixxx will interpret that internally as C#
> minor and immediately re-display the key in your chosen notation.
>
> The Deere 1280x800 skin is the only one with test widgets. There is a
> crossfader above the crossfader that controls deck 1's pitch and there is a
> key display to the left of the BPM display. Please don't file any bugs about
> this skin -- I know it's really crappy :).
>
> Speaking of bugs, please file any other bugs! There are some known issues:
> * SoundTouch kind of freaks out when you pitch-adjust tracks causing a
> performance issue. It's related to the ReadAheadManager read-log. For now
> just assume pitch shifting causes lag..
> * Pitch shifting quality is not great :(. Hopefully we can tweak SoundTouch
> here.
> * When you first start up, the key display says "INVALID". This is just for
> testing. Normally that would be the empty string.
>
> And currently on the TODO list:
> * A delegate for the key column that gives you a combo-box dropdown of keys
> in your notation.
> * The key column delegate should show the key in a red background if it is
> not understood by Mixxx (for example, if the key is read from an ID3 tag and
> Mixxx can't understand it).
> * libkeyfinder in the Mixxx VAMP plugin set
> * Key-based sync which will sync a track's pitch to match the target deck's
> key.
>
> Fun stuff!
> RJ
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