import fluidsynth import numpy as np def synthesis(midi_opus, soundfont_path, sample_rate=44100): ticks_per_beat = midi_opus[0] event_list = [] for track_idx, track in enumerate(midi_opus[1:]): abs_t = 0 for event in track: abs_t += event[1] event_new = [*event] event_new[1] = abs_t event_list.append(event_new) event_list = sorted(event_list, key=lambda e: e[1]) tempo = int((60 / 120) * 10 ** 6) # default 120 bpm ss = np.empty((0, 2), dtype=np.int16) fl = fluidsynth.Synth(samplerate=float(sample_rate)) sfid = fl.sfload(soundfont_path) last_t = 0 list_of_MIDI_patches=[0, 24, 32, 40, 42, 46, 56, 71, 73, 0, 53, 19, 0, 0, 0, 0] for c in range(16): if c == 9: fl.program_select(c, sfid, 128, 0) else: fl.program_select(c, sfid, 0, list_of_MIDI_patches[c]) for event in event_list: name = event[0] sample_len = int(((event[1] / ticks_per_beat) * tempo / (10 ** 6)) * sample_rate) sample_len -= int(((last_t / ticks_per_beat) * tempo / (10 ** 6)) * sample_rate) last_t = event[1] if sample_len > 0: sample = fl.get_samples(sample_len).reshape(sample_len, 2) ss = np.concatenate([ss, sample]) if name == "set_tempo": tempo = event[2] elif name == "patch_change": c, p = event[2:4] if c == 9: fl.program_select(c, sfid, 128, 0) else: fl.program_select(c, sfid, 0, p) elif name == "control_change": c, cc, v = event[2:5] fl.cc(c, cc, v) elif name == "note_on" and event[3] > 0: c, p, v = event[2:5] fl.noteon(c, p, v) elif name == "note_off" or (name == "note_on" and event[3] == 0): c, p = event[2:4] fl.noteoff(c, p) fl.delete() if ss.shape[0] > 0: max_val = np.abs(ss).max() if max_val != 0: ss = (ss / max_val) * np.iinfo(np.int16).max ss = ss.astype(np.int16) return ss