test program to get experience with Pyaudio

test/001_highsnr_stdio_audio/test_pa.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Throw away test program to help understand the care and feeding of PyAudio
+
+import pyaudio
+import numpy as np
+
+CHUNK = 1024
+FS48  = 48000
+FTEST = 800
+AMP   = 16000
+
+# 1. play sine wave out of default sound device
+
+p = pyaudio.PyAudio()
+stream = p.open(format=pyaudio.paInt16,
+                channels=1,
+                rate=FS48,
+                frames_per_buffer=CHUNK,
+                output=True
+)      
+
+f48 = open("out48.raw", mode='wb')
+t = 0;
+for f in range(50):
+    sine_48k = (AMP*np.cos(2*np.pi*np.arange(t,t+CHUNK)*FTEST/FS48)).astype(np.int16)
+    t += CHUNK
+    sine_48k.tofile(f48)
+    stream.write(sine_48k.tobytes())
+    sil_48k = np.zeros(CHUNK, dtype=np.int16)
+for f in range(50):
+    sil_48k.tofile(f48)
+    stream.write(sil_48k)
+    
+stream.stop_stream()
+stream.close()
+p.terminate()
+f48.close()