added changes on checking similarity

base/api/needlestorage.py

@@ -0,0 +1,35 @@
+from .wavsound import wavsound
+
+class needlestorage:
+    
+    """needlestorage object generates needles (subsequence sample) of wavsound
+    object data based on number of partitions (num_chunk) and 
+    number of samples to be analyzed (limit). The needles/samples are picked
+    deterministically so that the data sampled are evenly 
+    distributed across the wav file) """
+    
+    needles = []
+    def __init__(self, wavsound, sample_length, limit):
+        u=0
+        x=0
+        self.needles = []
+        data = wavsound.get_data()[::16] # skip every 16
+        print(int(len(data)/limit)-sample_length, "is skip value")
+        # determine the gap between the starting positions of two consecutive
+        # needles (i.e. opposite of degree of overlap)
+        skips_per_neeedle = max(1,int(len(data)/limit)-sample_length)
+        for i in range (len(data)):
+            if u >= limit:
+                break
+            if (x % skips_per_neeedle == 0):
+                self.needles.append(data[i:i+sample_length])
+                u = u + 1
+            x = x + 1
+    def pop_unused_needle(self):
+        if len(self.needles) == 0:
+            return []
+        return self.needles.pop(0)
+    def get_needles(self):
+        return self.needles
+    def clear_needles(self):
+        self.needles = []