add soundfile read/write unitest

.travis/unittest.sh

@@ -10,6 +10,7 @@ unittest(){
     cd $1 > /dev/null
     if [ -f "setup.sh" ]; then
         sh setup.sh
+        export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
     fi
     if [ $? != 0 ]; then
         exit 1

deep_speech_2/.gitignore

-thirdparty

deep_speech_2/setup.sh

@@ -10,19 +10,21 @@ if [ $? != 0 ]; then
 fi
 
 # install package libsndfile
-DIR="$( cd "$(dirname "$0")" ; pwd -P )"
-mkdir thirdparty
-curl -O "http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.28.tar.gz"
+python -c "import soundfile"
 if [ $? != 0 ]; then
-    echo "Download libsndfile-1.0.28.tar.gz failed !!!"
-    exit 1
+    echo "Install package libsndfile into default system path."
+    curl -O "http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.28.tar.gz"
+    if [ $? != 0 ]; then
+        echo "Download libsndfile-1.0.28.tar.gz failed !!!"
+        exit 1
+    fi
+    tar -zxvf libsndfile-1.0.28.tar.gz
+    cd libsndfile-1.0.28
+    ./configure && make && make install
+    cd ..
+    rm -rf libsndfile-1.0.28
+    rm libsndfile-1.0.28.tar.gz
 fi
-tar -zxvf libsndfile-1.0.28.tar.gz
-cd libsndfile-1.0.28
-./configure --prefix=$DIR/thirdparty/libsndfile && make && make install
-cd ..
-rm -rf libsndfile-1.0.28
-rm libsndfile-1.0.28.tar.gz
 
 # prepare ./checkpoints
 mkdir checkpoints

deep_speech_2/tests/test_setup.py

 """Test Setup."""
 import unittest
+import numpy as np
+import os
 
 
 class TestSetup(unittest.TestCase):
-    # test the installation of libsndfile library
     def test_soundfile(self):
-        import soundfile
+        import soundfile as sf
+        # floating point data is typically limited to the interval [-1.0, 1.0],
+        # but smaller/larger values are supported as well
+        data = np.array([[1.75, -1.75], [1.0, -1.0], [0.5, -0.5],
+                         [0.25, -0.25]])
+        file = 'test.wav'
+        sf.write(file, data, 44100, format='WAV', subtype='FLOAT')
+        read, fs = sf.read(file)
+        assert np.all(read == data)
+        assert fs == 44100
+        os.remove(file)
 
 
 if __name__ == '__main__':