def create_output_files(write_csv=True, write_midi=True):
for entry in to_extract:
(subtune, desc, seconds, starting_key, time_sig_top,
time_sig_bottom) = entry
sid = chiptunesak.SID()
sid.set_options(
sid_in_filename=sid_filename,
subtune=subtune,
tuning=448.93, # above code figured this out
vibrato_cents_margin=10,
seconds=seconds,
gcf_row_reduce=True,
)
filename_no_ext = 'examples/data/motl/motl_%s' % desc.replace(" ", "_")
sid_dump = sid.capture() # noqa: F841
if write_csv:
print("writing %s.csv" % filename_no_ext)
sid.to_csv_file(
project_to_absolute_path('%s.csv' % filename_no_ext))
if write_midi:
print("writing %s.mid" % filename_no_ext)
rchirp_song = sid.to_rchirp(sid_filename)
play_calls_per_quarter = 32 # can see this in the csv output
# milliframes_per_quarter will determine the QPM/BPM
chirp_song = \
rchirp_song.to_chirp(milliframes_per_quarter=play_calls_per_quarter * 1000)
chirp_song.set_key_signature(starting_key)
chirp_song.set_time_signature(time_sig_top, time_sig_bottom)
chiptunesak.MIDI().to_file(
chirp_song,
project_to_absolute_path('%s.mid' % filename_no_ext))
This minimal example imports a GoatTracker song and exports as MIDI.
"""
# Set up input and output paths
output_folder = str(project_to_absolute_path('examples\\data\\BWV_147')) + '\\'
input_folder = output_folder
input_file = str(project_to_absolute_path(input_folder + 'BWV_147_Bleibet.sng'))
output_midi_file = str(project_to_absolute_path(output_folder + 'BWV_147_Bleibet.mid'))
# Read in the song using the GoatTracker I/O class
print(f'Reading and converting {input_file}')
rchirp_song = chiptunesak.GoatTracker().to_rchirp(input_file, arch='PAL-C64')
# The song has a ritard at the end that will mess up the algorithm finding the beat, so eliminate it.
print(f'Removing the ritard at the end of the song')
rchirp_song.remove_tempo_changes()
# Turn the song into a ChirpSong object
print(f'Converting from RChirp to Chirp')
chirp_song = rchirp_song.to_chirp()
# We know the key signature and the time signature for the piece so set them (not required for playback)
print(f'Setting time and key signatures')
chirp_song.set_key_signature('G')
chirp_song.set_time_signature(3, 8)
# And write it to a MIDI file.
print(f'Writing to MIDI file {output_midi_file}')
chiptunesak.MIDI().to_file(chirp_song, output_midi_file)
It shows the steps needed for this conversion:
1. Scale and adjust the note data to correspond to musical notes and durations
2. Split a track with chords into 3 separate tracks
3. Assign GoatTracker instruments to the voices
4. Export the 5-track to a stereo GoatTracker .sng file
"""
input_file = str(
project_to_absolute_path(
'examples/data/lechuck/MonkeyIsland_LechuckTheme.mid'))
output_midi_file = str(
project_to_absolute_path('examples/data/lechuck/LeChuck.mid'))
output_gt_file = str(
project_to_absolute_path('examples/data/lechuck/LeChuck.sng'))
chirp_song = chiptunesak.MIDI().to_chirp(input_file)
print(f'Original song:')
print(f'#tracks = {len(chirp_song.tracks)}')
print(f' ppq = {chirp_song.metadata.ppq}')
print(f' tempo = {chirp_song.metadata.qpm} qpm')
print('Track names:')
print('\n'.join(f'{i+1}: {t.name}' for i, t in enumerate(chirp_song.tracks)))
print()
# First thing, we rename the song
chirp_song.metadata.name = "Monkey Island - LeChuck Theme"
print('Truncating original song...')
chirp_song.truncate(21240)
# Make a SID for Jim Happel's last-minute CRX demo...
import chiptunesak
from chiptunesak.constants import project_to_absolute_path
input_mid_file = project_to_absolute_path(
'examples\\data\\c128\\BWV_784_16th_to_8th.mid')
output_gt_file = project_to_absolute_path('examples\\temp\\BWV_784.sng')
chirp_song = chiptunesak.MIDI().to_chirp(input_mid_file,
quantization='8',
polyphony=False)
rchirp_song = chiptunesak.RChirpSong(chirp_song)
gt = chiptunesak.GoatTracker()
# TODO: Dang, end_with_repeat=True seems to create an unplayable song. Fix this
# after CRX
# gt.to_file(rchirp_song, output_gt_file, arch='NTSC-C64', end_with_repeat=True)
gt.to_file(rchirp_song, output_gt_file, arch='NTSC-C64')
chirp_song.metadata.name = "SkyFox - Main Theme"
chirp_song.metadata.composer = "Douglas Fulton"
# Now name the tracks
for t, name in zip(chirp_song.tracks, ['Square1', 'Square2', 'Square3']):
t.name = name
t.set_program(81) # Set program to General Midi square lead
# Quantize the song to a suitable granularity. It turns out we can quantize this to the shortest note duration
chirp_song.quantize(80, 80)
# And remove any polyphony
chirp_song.remove_polyphony()
# Write a MIDI file to look at to be sure it makes sense
chiptunesak.MIDI().to_file(chirp_song,
project_to_absolute_path(output_mid_file))
# Convert to MChirp
mchirp_song = chirp_song.to_mchirp(trim_partial=True)
# Generate sheet music with LilyPond
chiptunesak.Lilypond().to_file(mchirp_song, output_ly_file, format='song')
# Change directory to the data directory so we don't fill the source directory with intermediate files.
os.chdir(output_folder)
# Adjust the path the the file
ly_file = os.path.basename(output_ly_file)
# Run lilypond
print('lilypond -o %s %s' % (output_folder, output_ly_file))
subprocess.call('lilypond -o %s %s' % (output_folder, output_ly_file),