def build_data(preset, encoder=None):
""" Build Sysex preset data to given encoder instance
Returns the length of newly-built data.
If encoder is None, create a throw-away instance of the encoder, useful for
calculating data length in caller
"""
if encoder is None:
encoder = SyxEncoder()
rotaries = structs.build_rotaries()
longsliders = structs.build_longsliders()
hsliders = structs.build_hsliders()
vsliders = structs.build_vsliders()
# pads, sliders, buttons, etc.
for i in range(16):
_unwrap(encoder, preset[structs.PADS]["Pad%s" % i], structs.pads)
for i in range(2):
_unwrap(encoder, preset[structs.ROTARIES]["Rotary%s" % i], rotaries)
_unwrap(encoder, preset[structs.LONG_SLIDERS]["LongSlider0"], longsliders)
for i in range(4):
_unwrap(encoder, preset[structs.H_SLIDERS]["HSlider%s" % i], hsliders)
for i in range(4):
_unwrap(encoder, preset[structs.V_SLIDERS]["VSlider%s" % i], vsliders)
for i in range(4):
_unwrap(encoder, preset[structs.LR_BUTTONS]["LeftRightButton%s" % i], structs.lrswitches)
for i in range(2):
_unwrap(encoder, preset[structs.UD_BUTTONS]["UpDownButton%s" % i], structs.udswitches)
_unwrap(encoder, preset[structs.RHOMBUS_BUTTONS]["RhombusButton0"], structs.rhswitches)
for i in range(3):
_unwrap(encoder, preset[structs.TRANSPORT_BUTTONS]["TransportButton%s" % i], structs.tbuttons)
_unwrap(encoder, preset[structs.MODE_BUTTONS]["ModeButton0"], structs.mswitches)
# globals
for path in structs.globalpaths:
x = preset
for item in path:
x = x[item]
encoder.sum_encode(x)
# special case: velocity table
for velocity in preset[structs.PADS]['padVelocityTable']:
encoder.sum_encode(velocity)
data_length = encoder.counter
return data_length
