A small amount of stats analysis, mostly max callback time, with simple
display in the UI.
Also improves pow calculation to use lut implementation instead of
math.h pow(), for a speedup somewhere around 20-30%.
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.
On API 17+ (JellyBean MR1), get the buffer size and sample rate from the
platform, and use that, rather than hardcoding the defaults. We're still
using an internal buffer size (N) hardcoded to 64, so the amount of
computation per callback is not as consistent as it would be if that
were more flexible.
The FM kernel yields itself well to speedup using NEON assembler. This
patch contains the NEON assembly code, plus C integration code
(including making sure that buffers are aligned to 16 bytes).
This patch adds the low-level implementation of an LFO, with the DX7
waveforms, but doesn't yet contain the note wiring. It also adds a fast
lookup table based exp function, which is mostly used for envelopes.
There are also some build tweaks. It's possible some build files are
out of sync with the source, but at least the Android app seems to
build.
More sophisticated note stealing (better than round robin) and also
implementation of sustain (on midi controller 64). This implementation
matches the DX7 precisely.
Parameter changes and the like should work with unpacked patches,
so now we have an explicit patch unpack. In the future, the unpacking
will move out of the Dx7Note constructor.
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.
We were only using a very few STL functions (min, max, and iostream for
debug logging). This patch gets rid of those dependencies (implementing
the needed functions in synth.h), and turns on the "all" ABI target, so
that it works with all native architectures supported by the NDK.
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