common.loads() should return time only if asked to

calib.py

@@ -25,7 +25,7 @@ def recv():
         data = out.read(len(sig_dump))
         if len(data) < len(sig_dump):
             return
-        _, x = common.loads(data)
+        x = common.loads(data)
         x = x - np.mean(x)
 
         c = np.abs(np.dot(x, sig)) / (np.sqrt(0.5 * len(x)) * sigproc.norm(x))

common.py

@@ -42,15 +42,21 @@ def to_byte(bits):
     return chr(byte)
 
 
-def load(fileobj):
-    return loads(fileobj.read())
+def load(fileobj, time=False):
+    return loads(fileobj.read(), time=time)
 
 
-def loads(data):
+def loads(data, time=False):
     x = np.fromstring(data, dtype='int16')
     x = x / scaling
-    t = np.arange(len(x)) / Fs
-    return t, x
+    if np.max(np.abs(x)) > SATURATION_THRESHOLD:
+        raise ValueError('saturation')
+
+    if time:
+        t = np.arange(len(x)) / Fs
+        return t, x
+    else:
+        return x
 
 
 def dumps(sym, n=1):

sampling.py

@@ -72,7 +72,7 @@ if __name__ == '__main__':
     df, = sys.argv[1:]
     df = float(df)
 
-    _, x = common.load(sys.stdin)
+    x = common.load(sys.stdin)
     sampler = Sampler(x, Interpolator())
     sampler.freq += df
     y = np.array(list(sampler))

show.py

@@ -29,7 +29,7 @@ if __name__ == '__main__':
     import common
 
     for fname in sys.argv[1:]:
-        t, x = common.load(open(fname, 'rb'))
+        t, x = common.load(open(fname, 'rb'), time=True)
         pylab.figure()
         pylab.title(fname)
         spectrogram(t, x, common.Fs)

stream.py

@@ -27,8 +27,7 @@ class Reader(object):
             if data:
                 block.extend(data)
             if len(block) == self.BUFSIZE:
-                _, values = common.loads(str(block))
-                return values
+                return common.loads(str(block))
 
             time.sleep(self.WAIT)