Faster pretty_midi Fluidsynth method

gistfile1.py

import tempfile
import subprocess
import os
import pretty_midi
import librosa

def fast_fluidsynth(m, fs):
    '''
    Faster fluidsynth synthesis using the command-line program
    instead of pyfluidsynth.

    Parameters
    ----------
    - m : pretty_midi.PrettyMIDI
        Pretty MIDI object
    - fs : int
        Sampling rate

    Returns
    -------
    - midi_audio : np.ndarray
        Synthesized audio, sampled at fs
    '''
    # Write out temp mid file
    temp_mid = tempfile.NamedTemporaryFile()
    m.write(temp_mid.name)
    # Get path to temporary .wav file
    temp_wav = tempfile.NamedTemporaryFile()
    # Get path to default pretty_midi SF2
    sf2_path = os.path.join(os.path.dirname(pretty_midi.__file__),
                            pretty_midi.DEFAULT_SF2)
    # Make system call to fluidsynth
    with open(os.devnull, 'w') as devnull:
        subprocess.check_output(
            ['fluidsynth', '-F', temp_wav.name, '-r', str(fs), sf2_path,
             temp_mid.name], stderr=devnull)
    # Load from temp wav file
    audio, _ = librosa.load(temp_wav.name, sr=fs)
    # Occasionally, fluidsynth pads a lot of silence on the end, so here we
    # crop to the length of the midi object
    audio = audio[:int(m.get_end_time() * fs)]
    # Close/delete temp files
    temp_mid.close()
    temp_wav.close()
    return audio