real time audio spectrogram in the terminal

realtimeaudio.py

+"""
+PyAudio Example: Make a wire between input and output (i.e., record a
+few samples and play them back immediately).
+
+This is the callback (non-blocking) version.
+"""
+import numpy
+import pyaudio
+import time
+
+WIDTH = 2
+CHANNELS = 1
+RATE = 44100
+
+p = pyaudio.PyAudio()
+
+def g(z):
+    if z:
+        return '*'
+    else:
+        return ' '
+
+def callback(in_data, frame_count, time_info, status):
+    audio_data = numpy.fromstring(in_data, dtype=numpy.float32)
+    X = numpy.log(abs(numpy.fft.fft(audio_data)))
+    print( ''.join(g(z > 1.5) for z in X[:140]) )
+    return (in_data, pyaudio.paContinue)
+
+stream = p.open(format=pyaudio.paFloat32,
+                channels=CHANNELS,
+                rate=RATE,
+                input=True,
+                output=True,
+                stream_callback=callback)
+
+stream.start_stream()
+
+while stream.is_active():
+    time.sleep(0.2)
+
+stream.stop_stream()
+stream.close()
+
+p.terminate()