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.
The reverse channel from the SynthesizerService to the views has been
refactored a bit so it's just a standard MidiListener interface rather
than a whole bunch of listeners for individual messages.
A bunch of improvements to core MIDI handling. New functionality to
decode directly from a byte array (so you don't have to go through
InputStream), as well as more efficient and more concise code for
MessageOutputProcessor, plus some bug fixes.
Note that the tests haven't been run, maybe that would be a good idea.
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).
Raph Levien
Gregory Schlomoff
Bryan Klimt