ref: 89bc6f4938d3c1e41e351d7cd8314ed3fb3cd433
dir: /python/demos/demo_tapthebeat.py/
#! /usr/bin/env python """ A simple demo using aubio and pyaudio to play beats in real time Note you will need to have pyaudio installed: `pip install pyaudio`. Examples: ./demo_tapthebeat.py ~/Music/track1.ogg When compiled with ffmpeg/libav, you should be able to open remote streams. For instance using youtube-dl (`pip install youtube-dl`): ./demo_tapthebeat.py `youtube-dl -xg https://youtu.be/zZbM9n9j3_g` """ import sys import time import pyaudio import aubio import numpy as np win_s = 1024 # fft size hop_s = win_s // 2 # hop size # parse command line arguments if len(sys.argv) < 2: print("Usage: %s <filename> [samplerate]" % sys.argv[0]) sys.exit(1) filename = sys.argv[1] samplerate = 0 if len( sys.argv ) > 2: samplerate = int(sys.argv[2]) # create aubio source a_source = aubio.source(filename, samplerate, hop_s) samplerate = a_source.samplerate # create aubio tempo detection a_tempo = aubio.tempo("default", win_s, hop_s, samplerate) # create a simple click sound click = 0.7 * np.sin(2. * np.pi * np.arange(hop_s) / hop_s * samplerate / 3000.) # pyaudio callback def pyaudio_callback(_in_data, _frame_count, _time_info, _status): samples, read = a_source() is_beat = a_tempo(samples) if is_beat: samples += click #print ('tick') # avoid print in audio callback audiobuf = samples.tobytes() if read < hop_s: return (audiobuf, pyaudio.paComplete) return (audiobuf, pyaudio.paContinue) # create pyaudio stream with frames_per_buffer=hop_s and format=paFloat32 p = pyaudio.PyAudio() pyaudio_format = pyaudio.paFloat32 frames_per_buffer = hop_s n_channels = 1 stream = p.open(format=pyaudio_format, channels=n_channels, rate=samplerate, output=True, frames_per_buffer=frames_per_buffer, stream_callback=pyaudio_callback) # start pyaudio stream stream.start_stream() # wait for stream to finish while stream.is_active(): time.sleep(0.1) # stop pyaudio stream stream.stop_stream() stream.close() # close pyaudio p.terminate()