visualizer.py

import wave
import matplotlib.path as mpath
import matplotlib.patches as mpatches
import matplotlib.pyplot as plt


fig, ax = plt.subplots()

Path = mpath.Path
path_data = []
path_data.append((Path.MOVETO, (0.00, 0.00)))

wf = wave.open('Bowed-Bass-C2.wav', 'rb')
for i in range(1024):
    data = wf.readframes(4)
    val = 256*ord(data[0]) + ord(data[1])
    path_data.append((Path.LINETO, (i, val/256.0)))
    
codes, verts = zip(*path_data)
path = mpath.Path(verts, codes)

# plot control points and connecting lines
x, y = zip(*path.vertices)
line, = ax.plot(x, y, 'go-')

ax.grid()
ax.axis('equal')
plt.show()

wav_player.py

import pyaudio
import wave
import sys

CHUNK = 1024

def SteroToMono(data, samplewidth):
    new_data = ''
    for i in range(0, len(data), 2 * samplewidth):
        new_data += data[i:i+samplewidth]
    return new_data

def PlayWave(path):
    wf = wave.open(path, 'rb')
    p = pyaudio.PyAudio()
    stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),
                    channels=wf.getnchannels(),
                    rate=wf.getframerate(),
                    output=True)
    data = wf.readframes(CHUNK)
    while data != '':
        stream.write(data)
        data = wf.readframes(CHUNK)
    stream.stop_stream()
    stream.close()
    p.terminate()

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Plays a wave file.\n\nUsage: %s filename.wav" % sys.argv[0])
        sys.exit(-1)
    PlayWave(sys.argv[1])