Sampled Instrument Player with static and monolithic design. All instruments are built-in.
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import os
import sys
import struct
import time
import unittest
sys.path = ["./py"] + sys.path
import cbox
global Document
global Transport
Document = cbox.Document
Transport = cbox.Transport
# Make sure playback doesn't start prematurely
Transport.stop()
song = Document.get_song()
# Delete all the tracks and patterns
song.clear()
# Add the first track
trk = song.add_track()
# Create a binary blob that contains zero MIDI events
emptyblob = bytes()
# Create a new empty pattern
empty_pattern = song.pattern_from_blob(emptyblob, 16)
# This will be the length of the pattern (in pulses). It should be large enough
# to fit all the events
pattern_len = 10 * 24 * 2
# Add an instance (clip) of the empty pattern to the track
clip1 = trk.add_clip(pattern_len, 0, 16, empty_pattern)
# Add another instance after it
clip2 = trk.add_clip(2 * pattern_len, 0, 16, empty_pattern)
# Create a binary blob that contains the MIDI events
pblob = bytes()
for noteindex in range(20):
# note on
pblob += cbox.Pattern.serialize_event(noteindex * 24, 0x90, 36+noteindex*3, 127)
# note off
pblob += cbox.Pattern.serialize_event(noteindex * 24 + 23, 0x90, 36+noteindex*3, 0)
# Create a new pattern object using events from the blob
pattern = song.pattern_from_blob(pblob, pattern_len)
# Update all attributes of the second clip, rearranging the order
clip2.set_pattern(pattern)
clip2.set_pos(0)
clip2.set_offset(0)
clip2.set_length(pattern_len)
# Verify that the clips have been reordered
clips = [o.clip for o in trk.status().clips]
assert clips == [clip2, clip1]
# Stop the song at the end
song.set_loop(pattern_len, pattern_len)
# Set tempo - the argument must be a float
Transport.set_tempo(160.0)
# Send the updated song data to the realtime thread
song.update_playback()
# Flush
Transport.stop()
print ("Song length (seconds) is %f" % (cbox.Transport.ppqn_to_samples(pattern_len) * 1.0 / Transport.status().sample_rate))
# The /master object API doesn't have any nice Python wrapper yet, so accessing
# it is a bit ugly, still - it works
# Start playback
Transport.play()
print ("Playing")
while True:
# Get transport information - current position (samples and pulses), current tempo etc.
master = Transport.status()
print (master.pos_ppqn)
# Query JACK ports, new USB devices etc.
cbox.call_on_idle()
time.sleep(0.1)