OPTIMIZED: collecting samples in python list instead of np.array, empty array deletion in fly

project/midi.py

@@ -2,45 +2,44 @@
 
 import settings
 import pypianoroll as roll
-import matplotlib.pyplot as plt
 import numpy as np
 import os
 from tqdm import tqdm
 from math import floor
 import sys
-import pickle
-from tqdm import tqdm
-from tqdm import trange
 from collections import defaultdict
-import bz2
 import pickle
 
 midi_folder_path = sys.argv[1]
 output_path = sys.argv[2]
 
-def to_samples(midi_file_path, midi_res=settings.midi_resolution):
+def to_samples(multitrack, midi_res=settings.midi_resolution, how='by_group'):
 
-    # add transpositions of every sample to every possible key transposition
+    #how = 'by_group', 'by_instrument', 'merged',
+
+    # TODO: add transpositions of every sample to every possible key transposition
     # np.roll(sample, pitch_interval, axis=1) for transposition
     # np.roll(sample, time_steps, axis=0) for time shifting
 
-    fill_empty_array = lambda : np.empty((0, 96, 128))
-    samples_by_instrument = defaultdict(fill_empty_array)
-    all_beats = np.empty((0, 96, 128))
+    samples_by_instrument = defaultdict( lambda : [] )
 
-    for track in roll.Multitrack(midi_file_path).tracks:
-        if not track.is_drum:
-            key = settings.midi_group[track.program + 1]
-        else:
-            key = 'Drums'
+    for track in multitrack.tracks:
+
+        key = settings.midi_group[track.program + 1] if not track.is_drum else 'Drums'
 
         # this makes pack of samples of N x 96 x 128 shape
         number_of_beats = floor(track.pianoroll.shape[0] / midi_res)
         track_pianoroll = track.pianoroll[: number_of_beats * midi_res]
         track_beats = track_pianoroll.reshape(number_of_beats, midi_res, 128)
 
-        # save collected pack of data to dictionary with samples packs for every instrument
-        samples_by_instrument[key] = np.concatenate([track_beats, samples_by_instrument[key]], axis=0)
+        # save collected pack of data to dictionary with samples packs for groups of instruments
+        for sample in track_beats:
+            if sample.sum() != 0:
+                samples_by_instrument[key].append(sample)
+
+        # TODO: add posibility of choosing between saving samples to groups of instrument, or to every instrument separatly or with no differance
+        # TODO: add option, for looking only for one instrument/group
+        # TODO: add option for colecting, more than one beat per sample (min 4)
 
     return samples_by_instrument
 
@@ -50,52 +49,34 @@ def to_midi(samples, output_path=settings.generated_midi_path, program=0, tempo=
     roll.write(return_midi, output_path)
     return return_midi
 
-def delete_empty_samples(sample_pack):
-    non_empty_arrays = []
-    for sample in sample_pack:
-        if sample.sum() != 0:
-            non_empty_arrays.append(sample)
-    return np.array(non_empty_arrays)
+# TODO: Make optial function to erase information of note lenth - ??
+def ignore_note_lenght():
+    pass
 
 def main():
     print('Exporting...')
-    from collections import defaultdict
-    fill_empty_array = lambda : np.empty((0, 96, 128))
-    samples_pack_by_instrument = defaultdict(fill_empty_array)
-    sample_pack = np.empty((0,settings.midi_resolution,128))
+
+    samples_pack_by_instrument = defaultdict( lambda : list() )
+
     for directory, subdirectories, files in os.walk(midi_folder_path):
         for midi_file in tqdm(files):
             midi_file_path = os.path.join(directory, midi_file)
+            #load midi ro pypianoroll - Multirack
             try:
-                midi_samples = to_samples(midi_file_path)
+                multitrack = roll.parse(midi_file_path)
             except:
-                pass
-            if midi_samples is None:
+                # IDEA: Log errors, and save to file?
                 continue
 
-            # this is for intrument separation
-            for key, value in midi_samples.items():
-                value = delete_empty_samples(value)
-                samples_pack_by_instrument[key] = np.concatenate((samples_pack_by_instrument[key], value), axis=0)
-
-    # save as compressed pickle (sample-dictionary)
-    # sfile = bz2.BZ2File('data/samples.pickle', 'w')
-    # pickle.dump(dict(samples_pack_by_instrument), sfile)
+            for key, value in to_samples(multitrack).items():
+                samples_pack_by_instrument[key].extend(value)
 
     # this is for intrument separation
     print('Saving...')
-    for key, value in tqdm(samples_pack_by_instrument.items()):
     if not os.path.exists(output_path):
         os.makedirs(output_path)
-        np.savez_compressed('{}/{}.npz'.format(output_path, key), value)
-
-        # # Give a preview of what samples looks like
-        # fig, axes = plt.subplots(nrows=10, ncols=10, figsize=(20, 20))
-        # for idx, ax in enumerate(axes.ravel()):
-        #     n = np.random.randint(0, value.shape[0])
-        #     sample = value[n]
-        #     ax.imshow(sample, cmap = plt.get_cmap('gray'))
-        # plt.savefig('data/samples/{}.png'.format(settings.midi_program[key]))
+    for key, value in tqdm(samples_pack_by_instrument.items()):
+        np.savez_compressed('{}/{}.npz'.format(output_path, key), np.array(value))
 
     print('Done!')