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