add support for multichannel audio

app.py

@@ -11,9 +11,9 @@ def extend(audio):
     x = x.astype(np.float32) / 32767.0
 
     with torch.no_grad():
-        y = model(torch.from_numpy(x), fs).numpy()
+        y = np.stack([model(torch.from_numpy(x), fs) for x in x.T]).T
+        y = (y * 32767.0).astype(np.int16)
         fs = int(model.sample_rate)
-    y = (y * 32767.0).astype(np.int16)
 
     return fs, y