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Simplify _midifilter.lua example

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Instead of and-ing the first byte to extract the event type, it is
simpler and easier to understand to bitwise-shift it, so that we don't
get the result as a multiple of 2^4, but as values corresponding to the
MIDI specification.

Currently, a guard is put against events with completely empty data,
though maybe ardour discards those earlier on since that would not be
valid MIDI.
This commit is contained in:
Julien "_FrnchFrgg_" RIVAUD 2017-07-14 15:16:33 +02:00
parent 812cbdaca9
commit 3b1a6a350e
1 changed files with 4 additions and 3 deletions
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7
scripts/_midifilter.lua
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@ -27,11 +27,12 @@ function dsp_run (_, _, n_samples)
for _,b in pairs (midiin) do
local t = b["time"] -- t = [ 1 .. n_samples ]
local d = b["data"] -- get midi-event
local event_type
if #d == 0 then event_type = -1 else event_type = d[1] >> 4 end
if (#d == 3 and bit32.band (d[1], 240) == 144) then -- note on
if (#d == 3 and event_type == 9) then -- note on
tx_midi (t, d)
end
if (#d == 3 and bit32.band (d[1], 240) == 128) then -- note off
elseif (#d == 3 and event_type = 8) then -- note off
tx_midi (t, d)
end
end