main.py

#!/usr/bin/env python3
"""
Modified from example code from sounddevice documentation at
https://python-sounddevice.readthedocs.io/en/0.4.6/examples.html

Plot the live microphone signal(s) with matplotlib.
Matplotlib and NumPy have to be installed.

"""
import argparse
import queue
import sys

from matplotlib.animation import FuncAnimation
import matplotlib.pyplot as plt
import numpy as np
import sounddevice as sd

import keyboard

jump = False

# Increase to decrease sensitivity
THRESHOLD = 0.002
# How long to hold down the key (calls to audio_callback()), depends on the audio callback frequency
PRESS_DURATION = 2


def int_or_str(text):
    """Helper function for argument parsing."""
    try:
        return int(text)
    except ValueError:
        return text


parser = argparse.ArgumentParser(add_help=False)
parser.add_argument(
    '-l', '--list-devices', action='store_true',
    help='show list of audio devices and exit')
args, remaining = parser.parse_known_args()
if args.list_devices:
    print(sd.query_devices())
    parser.exit(0)
parser = argparse.ArgumentParser(
    description=__doc__,
    formatter_class=argparse.RawDescriptionHelpFormatter,
    parents=[parser])
parser.add_argument(
    'channels', type=int, default=[1], nargs='*', metavar='CHANNEL',
    help='input channels to plot (default: the first)')
parser.add_argument(
    '-d', '--device', type=int_or_str,
    help='input device (numeric ID or substring)')
parser.add_argument(
    '-w', '--window', type=float, default=200, metavar='DURATION',
    help='visible time slot (default: %(default)s ms)')
parser.add_argument(
    '-i', '--interval', type=float, default=30,
    help='minimum time between plot updates (default: %(default)s ms)')
parser.add_argument(
    '-b', '--blocksize', type=int, help='block size (in samples)')
parser.add_argument(
    '-r', '--samplerate', type=float, help='sampling rate of audio device')
parser.add_argument(
    '-n', '--downsample', type=int, default=10, metavar='N',
    help='display every Nth sample (default: %(default)s)')
args = parser.parse_args(remaining)
if any(c < 1 for c in args.channels):
    parser.error('argument CHANNEL: must be >= 1')
mapping = [c - 1 for c in args.channels]  # Channel numbers start with 1
q = queue.Queue()


def audio_callback(indata, frames, time, status):
    global jump
    """This is called (from a separate thread) for each audio block."""
    if status:
        print(status, file=sys.stderr)

    x = max(indata[::args.downsample, mapping])

    if x > THRESHOLD:
        print(x)
        jump = PRESS_DURATION
        keyboard.press('space')
    else:
        jump -= 1 if jump > 0 else 0

    if jump == 0:
        keyboard.release('space')

    q.put(indata[::args.downsample, mapping])


def update_plot(frame):
    """This is called by matplotlib for each plot update.

    Typically, audio callbacks happen more frequently than plot updates,
    therefore the queue tends to contain multiple blocks of audio data.

    """
    global plotdata
    while True:
        try:
            data = q.get_nowait()
        except queue.Empty:
            break
        shift = len(data)
        plotdata = np.roll(plotdata, -shift, axis=0)
        plotdata[-shift:, :] = data
        # change color
        lines[0].set_color('red' if jump > 0 else 'blue')
    for column, line in enumerate(lines):
        line.set_ydata(plotdata[:, column])
    return lines


try:
    if args.samplerate is None:
        device_info = sd.query_devices(args.device, 'input')
        args.samplerate = device_info['default_samplerate']

    length = int(args.window * args.samplerate / (1000 * args.downsample))
    plotdata = np.zeros((length, len(args.channels)))

    fig, ax = plt.subplots()
    lines = ax.plot(plotdata)
    if len(args.channels) > 1:
        ax.legend([f'channel {c}' for c in args.channels],
                  loc='lower left', ncol=len(args.channels))
    ax.axis((0, len(plotdata), -1, 1))
    ax.set_yticks([0])
    ax.yaxis.grid(True)
    ax.tick_params(bottom=False, top=False, labelbottom=False,
                   right=False, left=False, labelleft=False)
    fig.tight_layout(pad=0)

    stream = sd.InputStream(
        device=args.device, channels=max(args.channels),
        samplerate=args.samplerate, callback=audio_callback)
    ani = FuncAnimation(fig, update_plot, interval=args.interval, blit=True)
    with stream:
        plt.show()
except Exception as e:
    parser.exit(type(e).__name__ + ': ' + str(e))