adding rough scripts for merging two sound files. note quality degred…

…ation

scripts.py

@@ -0,0 +1,37 @@
+import librosa
+import numpy as np
+
+
+def load_to_db(inp, duration = 30):
+    x, sr = librosa.load(inp, duration = duration)
+    X = librosa.stft(x)
+    Xdb = librosa.amplitude_to_db(X)
+    return Xdb, sr
+
+
+def mix_transform(Xdb1,Xdb2):
+    db_range = Xdb1.shape[0]
+    shared_length = min(Xdb1.shape[1],Xdb2.shape[1])
+
+    mix = np.random.random(size=(db_range,shared_length)) > .5
+
+    Xdb3 = mix * Xdb1[:,:shared_length] + np.logical_not(mix) * Xdb2[:,:shared_length]
+
+    return Xdb3
+
+
+def merge(in1, in2, out, transform_method = mix_transform, duration=30):
+    Xdb1, sr = load_to_db(in1,duration = duration)
+    Xdb2, sr = load_to_db(in2, duration = duration )
+
+    Xdb3 = transform_method(Xdb1,Xdb2)
+    X3 = librosa.db_to_amplitude(Xdb3)
+    x3 = librosa.core.istft(X3)
+    librosa.output.write_wav(out, x3, sr)
+
+
+### Testing
+input1_path = '../samples/audio/busta_rhymes_hits_for_days.mp3'
+input2_path = '../samples/steve-morrell/Life Gift.mp3'
+output_path = 'merge-test-out.wav'
+merge(input1_path, input2_path, output_path, duration = 7)