From: Paul Brossier <piem@piem.org>
Date: Fri, 16 Nov 2018 20:06:13 +0000 (+0100)
Subject: [test] add a test using sink and source to check channel mixing
X-Git-Tag: 0.4.8~58
X-Git-Url: https://git.aubio.org/?p=aubio.git;a=commitdiff_plain;h=ca993258e0a7bf00048cdfeb1fc417b937f26e1a

[test] add a test using sink and source to check channel mixing
---

diff --git a/python/tests/test_source_channels.py b/python/tests/test_source_channels.py
new file mode 100755
index 00000000..eee696d6
--- /dev/null
+++ b/python/tests/test_source_channels.py
@@ -0,0 +1,93 @@
+#! /usr/bin/env python
+
+"""A brute force test using `sink` to create and write samples to a stereo
+file, then `source` to check the correct content is read from the files."""
+
+import os.path
+import unittest
+import aubio
+import numpy as np
+from numpy.testing import assert_equal
+from utils import get_tmp_sink_path
+
+class aubio_source_test_case(unittest.TestCase):
+
+    def test_read_from_mono(self):
+        out = get_tmp_sink_path()
+        samplerate = 44100
+        hop_size = 256
+        blocks = 10
+        channels = 1
+        write_samples = np.ones([channels, hop_size], dtype=aubio.float_type)
+        write_samples *= .5
+        self.check_write_and_read(samplerate, channels, hop_size, blocks,
+                write_samples)
+
+    def test_read_from_stereo(self):
+        out = get_tmp_sink_path()
+        samplerate = 44100
+        hop_size = 256
+        blocks = 10
+        channels = 1
+        write_samples = np.ones([channels, hop_size], dtype=aubio.float_type)
+        write_samples *= .5
+        self.check_write_and_read(samplerate, channels, hop_size, blocks,
+                write_samples)
+
+    def test_read_from_half_stereo(self):
+        samplerate = 16000
+        channels = 2
+        hop_size = 512
+        blocks = 10
+        write_samples = np.ones([channels, hop_size], dtype=aubio.float_type)
+        write_samples *= .5
+        write_samples[1, :] = 0
+        self.check_write_and_read(samplerate, channels, hop_size, blocks,
+                write_samples)
+
+    def test_read_from_cancelling_channels(self):
+        samplerate = 16000
+        channels = 2
+        hop_size = 512
+        blocks = 10
+        write_samples = np.ones([channels, hop_size], dtype=aubio.float_type)
+        write_samples *= .5
+        write_samples[1] *= -1
+        self.check_write_and_read(samplerate, channels, hop_size, blocks,
+                write_samples)
+
+    def test_read_from_strange_three_channels(self):
+        samplerate = 8000
+        channels = 3
+        hop_size = 123
+        blocks = 10
+        write_samples = np.ones([channels, hop_size], dtype=aubio.float_type)
+        write_samples *= .5
+        write_samples[1, :] = 0
+        self.check_write_and_read(samplerate, channels, hop_size, blocks,
+                write_samples)
+
+    def check_write_and_read(self, samplerate, channels,
+            hop_size, blocks, write_samples):
+        expected_mono = np.sum(write_samples, axis=0)/write_samples.shape[0]
+        out = get_tmp_sink_path()
+        snk = aubio.sink(out, samplerate, channels=channels)
+        for i in range(blocks):
+            snk.do_multi(write_samples, hop_size)
+        # close the sink before reading from it
+        snk.close()
+
+        src = aubio.source(out, samplerate, hop_size)
+        for i in range(blocks):
+            read_samples, read = src.do_multi()
+            assert_equal (read_samples, write_samples)
+            assert_equal (read, hop_size)
+
+        src.seek(0)
+        for i in range(blocks):
+            read_samples, read = src()
+            assert_equal (read, hop_size)
+            assert_equal (read_samples, expected_mono)
+
+if __name__ == '__main__':
+    unittest.main()