Random audio keyboard with Python
I made a simple python script to collect random samples of audio from the internet and spread them across my midi keyboard for musical inspiration.
Finding an audio source
YouTube is a rich source of audio content. The script generates a search term from two random English words and downloads search results using pytube.
def generate_keywords() -> List[str]:
''' return two random english words '''
rw = RandomWords()
words = rw.random_words()[0:1]
return words # ['polyrhythm', 'Handies Peak']
def search_youtube(keywords: List[str]):
''' return youtube links from provided keywords '''
result = {}
while not result:
result = YoutubeSearch(
' '.join(keywords), max_results=10).to_dict()
links = ['http://youtube.com/' + r['url_suffix'] for r in result]
return links
def download_audio(links: List[str], output_path: str = None) -> None:
''' download audio from youtube link '''
for link in links:
try:
yt = YouTube(link)
yt.register_on_complete_callback(process_audio)
yt.streams.filter(only_audio=True)[
0].download(output_path=output_path)
except:
print(f'Could not download {link}')
Slicing the audio
The script slices the audio up by detecting sound energy above a certain threshold using Audiotok.
def process_audio(stream: Stream, source_filepath: str) -> None:
''' function called upon download of audio '''
audio_regions = split(source_filepath, energy_threshold=50,
max_dur=10, min_dur=1)
os.remove(source_filepath)
os.mkdir(source_filepath + '\\')
for region in audio_regions:
filename = region.save(source_filepath + "\\{meta.start:.3f}.wav")
print("sample saved as: {}".format(filename))
Putting it all together
The audio samples can be sent to your midi keyboard’s audio sample directory using the output-path option. I’ve set mine to the ‘samples’ folder.
keywords = generate_keywords()
links = search_youtube(keywords)
download_audio(links[:2], output_path='samples')
The full source can be found on Github.
August 3, 2020