This patch changes the ScoreActivity (and the ScoreView that powers it)
to use a generic MidiListener rather than the old
MultiChannelSynthesizer, so that it can play with the new C++ based
sound output module.
The instrument selection maps to MIDI channel, which doesn't actually
change instruments (the synth module is not multitimbral), but this
could be made to work.
Also, the score is stored in protocol buffers, and the plan is for those
to go away, probably replaced by JSON, because of code size and build
difficulty.
A fairly simple feature - preferences for velocity sensitivity, but a
fair amount of UI infrastructure. This patch includes a new
KnobPreference, changes to KnobView to support a horizontal layout
(which works better in a layout with more compressed vertical space),
and of course the plumbing of the preference itself.
Also some rework of the touch handler in the KeyboardView. This patch
simplifies the logic a bit and fixes a long-standing bug in which the
pressure was always read from pointer index 0 rather than the pointer
index of the key being pressed.
Align keyboard at bottom of screen if there's plenty of space (tablets).
Use simpler logic (do as little as possible programatically, use XML to
do heavy lifting).
The main reason for these to be inside the KnobView is so that they can
be part of the touch target for the knob. A more general approach would
be to make the Knob a container that can contain TextView widgets, but
this is simpler.
This adjusts the dimensions of the knobs and scroll strip to be a little
better on both phones and tablets. The knobs look a little small, but
they'll be redesigned soon to work better in smaller sizes.
The first setting is just the keyboard layout, but we'll add lots more
in time (velocity sensitivity). Plus, some synth state (program change
in particular) should persist, and this is a good mechanism.
There are some infelicities: the settings screen doesn't bind the synth
service, so sound pauses. Also, fullscreen is inconsistent and should be
rethought (maybe immersive on KitKat).
New activities can subclass from the SynthActivity, and that will keep
the sound going. We'll actually do something a little different for
preferences, but this will be useful for other activities.
Maximum scroll and zoom range for the keyboard and strip, some style
changes to the knob views (to make them work better for light theme and
also scale for density). This version is basically at least as good as
the old view (although is still lacking octave buttons).
With these changes, there's a max height of 300dp, and a bit more room
in a phone layout (some of the hidden status message widgets were taking
vertical space).
This patch adds text labels (the logic is there for all keys, but we
only draw on C), glissando. and some fine-tuning. The glissando is more
because some touch events are misclassified as move, rather than to
implement actual glissando.
Also, this patch adds velocity, but not yet with adjustable sensitivity.
This patch adds crude touch processing (non multitouch, no tracking),
but it's enough to noodle out melodies to validate the new approach.
The patch also wires up the new view and starts to make some style
changes (holo light theme).
This patch contains a new keyboard view with an adjustable layout.
As of this version, it draws and displays notes from the MIDI keyboard
but doesn't handle any of its own touch events.
This patch implements nonlinear distortion in the resonant ladder
filter. It's based on the differential equations in the Huovilainen '04
DAFx paper, but using matrix exponential to compute the evolution of the
state variables. The implementation is scalar (and calls into sqrtf),
but designed to be implemented in very efficient SIMD.
This version was published to Play Store as 0.91.
Train patch didn't render right. Should investigate further, but in
the meantime swap out one that does. Also narrow filter range,
increase touch count to 10, and fix pitch env for L4 != 50 case
(take-off patch).
The "com.google" namespace is reserved for official releases, so
renaming to "com.levien".
Also small tweaking to piano2.xml to clean it up for release (arguably
should have been separate commit, but oh well).
Add a button to capture raw start and end callback time (just putting it
in a text buffer so it can be copied), which is useful for making plots.
Also a bunch of commented out code to provoke priority inversion or
sudden increases in load (which exercises the governor), again for the
purpose of probing performance and making plots.
The android_glue unit now collects timestamp stats and reports them up
through a ring buffer to the app. The app currently just displays a raw
line in a text view, but we'll expand that out to smarter aggregation.
This change adds a (single) resonant filter to the C++ synth unit, and
wires up both USB MIDI and on-screen controls for cutoff and resonance.
Also fixes a bug in KnobView which caused the knob value to jump around.
This patch wires up pressure sensitivity from the touchscreen. It also
adds simple USB Host mode for MIDI keyboards (tested on M-Audio KeyRig 49
and Akai MPK mini). Finally, it cleans up a bit.
The USB listening thread should be moved out of the activity and into a
service (there can be problems on multiple plug and unplug). But this
should be good enough to play with.
Raph Levien
Bryan Klimt