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"'''\n",
"This is the data processing script for POP909:A Pop song Dataset for Music Arrangement Generation\n",
"============\n",
"It will allow you to quickly process the POP909 Files (Midi) into the Google Magenta's music representation \n",
" as like [Music Transformer](https://magenta.tensorflow.org/music-transformer) \n",
" [Performance RNN](https://magenta.tensorflow.org/performance-rnn).\n",
"\n",
"'''\n",
"import pickle\n",
"import os\n",
"import sys\n",
"import utils\n",
"from processor import MidiEventProcessor\n",
"import pretty_midi as pyd\n",
"import numpy as np\n",
"\n"
]
},
{
"cell_type": "code",
"execution_count": null,
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"source": [
"total = 0\n",
"def preprocess_midi(path):\n",
" global total\n",
" data = pyd.PrettyMIDI(path)\n",
" main_notes = []\n",
" acc_notes = []\n",
" for ins in data.instruments:\n",
" acc_notes.extend(ins.notes)\n",
" for i in range(len(main_notes)):\n",
" main_notes[i].start = round(main_notes[i].start,2)\n",
" main_notes[i].end = round(main_notes[i].end,2)\n",
" for i in range(len(acc_notes)):\n",
" acc_notes[i].start = round(acc_notes[i].start,2)\n",
" acc_notes[i].end = round(acc_notes[i].end,2)\n",
" main_notes.sort(key = lambda x:x.start)\n",
" acc_notes.sort(key = lambda x:x.start)\n",
" mpr = MidiEventProcessor()\n",
" repr_seq = mpr.encode([main_notes, acc_notes])\n",
" total += len(repr_seq)\n",
" return repr_seq\n",
"\n",
"def preprocess_pop909(midi_root, save_dir):\n",
" save_py = []\n",
" midi_paths = [d for d in os.listdir(midi_root)]\n",
" i = 0\n",
" out_fmt = '{}-{}.data'\n",
" for path in midi_paths:\n",
" print(' ', end='[{}]'.format(path), flush=True)\n",
" filename = midi_root + path\n",
" try:\n",
" data = preprocess_midi(filename)\n",
" except KeyboardInterrupt:\n",
" print(' Abort')\n",
" return\n",
" except EOFError:\n",
" print('EOF Error')\n",
" return\n",
" save_py.append(data)\n",
" save_py = np.array(save_py)\n",
" print(save_py.size)\n",
" np.save(\"pop909-event-token.npy\", save_py)\n",
" \n",
" \n",
"# replace the folder with your POP909 data folder\n",
"preprocess_pop909(\"../pop909\",\"midi_data/\")"
]
}
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