py script for generationg sine table

tool/sine_table_generator.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+import math
+import sys
+
+# 1HZ == 1 sine
+# sample rate at 44100Hz, sine at 441Hz -> 441 sines in 44100 samples -> 44100/441 samples/sine
+
+sine_array = '''
+// input signal: pre-computed int16 sine wave, {sine_sample_rate} Hz at {sine_frequency} Hz  
+static const int16_t sine_int16[] = {{'''
+
+VALUES_PER_LINE = 10
+sine_sample_rate = 44100
+sine_frequency = 441
+
+if __name__ == "__main__":
+    usage = '''
+    Usage: ./sine_table.py sine_frequency sine_sample_rate
+    '''
+
+    if (len(sys.argv) < 3):
+        print(usage)
+        sys.exit(1)
+    
+    sine_frequency = int(sys.argv[1])
+    sine_sample_rate = int(sys.argv[2])
+
+    if sine_frequency <= 0:
+        print(usage)
+        sys.exit(1)
+    
+    if sine_sample_rate <= 0:
+        print(usage)
+        sys.exit(1)
+
+    sine_num_samples = sine_sample_rate/sine_frequency        
+    
+    print(sine_array.format(sine_sample_rate=sine_sample_rate, sine_frequency=sine_frequency))
+    items = 0
+    for sample in range(0,sine_num_samples):
+        items = items + 1
+        angle = (sample * 360.0) / sine_num_samples      
+        sine = math.sin(math.radians(angle))
+        rescaled = int(round(sine * 32767))
+        print ("%6d, " % rescaled),
+        if items == VALUES_PER_LINE:
+            items = 0
+            print
+    
+    print( "};")