ref: 703cc2bf238703cb683e3075cd7e3a46741f47f2
parent: d94afb37f953f5d7cad9881dac42bff1e3b66f9c
author: Paul Brossier <piem@piem.org>
date: Thu Nov 29 09:27:05 EST 2018
[tests] add script to create sound file with python only
--- /dev/null
+++ b/tests/create_tests_source.py
@@ -1,0 +1,39 @@
+#! /usr/bin/env python
+
+""" Create a simple stereo file containing a sine tone at 441 Hz, using only
+numpy and python's native wave module. """
+
+import wave
+import numpy as np
+
+
+def create_sine_wave(freq, samplerate, nframes, nchannels):
+ """ create a pure tone """
+ # samples indices
+ _t = np.tile(np.arange(nframes), (nchannels, 1))
+ # sine wave generation
+ _x = 0.7 * np.sin(2. * np.pi * freq * _t / float(samplerate))
+ # conversion to int and channel interleaving
+ return (_x * 32767.).astype(np.int16).T.flatten()
+
+
+def create_test_sound(pathname, freq=441, duration=None,
+ sampwidth=2, framerate=44100, nchannels=2):
+ """ create a sound file at pathname, overwriting exiting file """
+ nframes = duration or framerate # defaults to 1 second duration
+ fid = wave.open(pathname, 'w')
+ fid.setnchannels(nchannels)
+ fid.setsampwidth(sampwidth)
+ fid.setframerate(framerate)
+ fid.setnframes(nframes)
+ frames = create_sine_wave(freq, framerate, nframes, nchannels)
+ fid.writeframes(frames.tobytes())
+ fid.close()
+ return 0
+
+
+if __name__ == '__main__':
+ import sys
+ if len(sys.argv) < 2:
+ sys.exit(2)
+ sys.exit(create_test_sound(sys.argv[1]))