raspberry pi 3 でstretch その15

概要

raspberry pi 3 でstretchやってみた。
pythonでmidi再生やってみた。

環境

Raspberry Pi 3 model B v1.2 element14
2017-09-07-raspbian-stretch

インストール

sudo aptitude install python-pyaudio
sudo pip install softsynth

サンプルコード

import sys
import argparse
from synth.synthesizer import Synthesizer
from synth.wave_writer import WaveWriter
from synth.options import Options
from synth import stream
from synth.instruments.OvertoneInstrument import OvertoneInstrument
from synth.note_envelopes import MidiTrackNoteEnvelope

def profile_call():
    opts = Options()
    instr = OvertoneInstrument(opts, ArpeggioNoteEnvelope())
    input = instr
    input.get_samples_in_byte_rate(44100)

def profile(opts):
    if opts.profile_application:
        import cProfile
        import pstats
        cProfile.run('profile_call()', 'restats')
        p = pstats.Stats('restats')
        p.strip_dirs().sort_stats('time').print_stats()
        sys.exit(0)

def get_args():
    parser = argparse.ArgumentParser(prog = 'synth', description = 'Programmable synth')
    parser.add_argument('input', metavar = 'INPUT', nargs=1, help = 'the input file path')
    parser.add_argument('output', metavar = 'OUTPUT', nargs='?', help = 'the optional output file path. Default is INPUT.wav')
    parser.add_argument('--bpm', '-b')
    parser.add_argument('-w', '--wave', action = 'store_true', help = 'Output wave file.')
    parser.add_argument('--profile', action = 'store_true', help = 'Profile the application to find hot spots.')
    parser.add_argument('--stdout', action = 'store_true', help = 'Also write PCM data to stdout. Only valid in conjunction with the --wave flag.')
    args = parser.parse_args()
    opts = Options(args.input[0], args.output, args.bpm)
    opts.write_wave = args.wave
    opts.write_wave_to_stdout = args.stdout
    opts.profile_application = args.profile
    return opts

def main():
    opts = get_args()
    synth = Synthesizer(opts).load_from_midi(opts.input)
    profile(opts)
    wave = None
    if stream.PYAUDIO and not opts.write_wave:
        stream.stream_to_pyaudio(opts, synth)
    else: 
        WaveWriter(opts).output(synth)

if __name__ == '__main__':
    main()

実行

python synth.py -b 120 test1.mid

以上。