better video recording (rotate, copy frames); preset updates

tools/mknotes.py

@@ -7,12 +7,14 @@ parser.add_argument('-l', '--length', type=int, default=64, help="length of note
 parser.add_argument('-u', '--upper', type=int, default=49, help="upper note # to test")
 parser.add_argument('-f', '--freq', type=float, default=3579545/32.0, help="base frequency (Hz)")
 parser.add_argument('-b', '--bias', type=float, default=0, help="divisor bias")
+parser.add_argument('-m', '--maxbits', type=float, default=12, help="max. # of bits")
 args = parser.parse_args()
 
 test_notes = args.upper
 final_notes = args.length
 basehz = args.freq
 bias = args.bias
+maxval = (1<<int(args.maxbits))-1
 
 results = []
 
@@ -21,6 +23,8 @@ for a440 in range(4300,4500):
     for note in range(1,test_notes):
         notehz = a440 / 10.0 * math.pow(2.0, (note - 49) / 12.0);
         period = int(round(basehz / notehz)) 
+        while period > maxval:
+            period /= 2
         tonehz = basehz / period
         error += abs(notehz-tonehz)
         #print a440,note,notehz,notehz-tonehz,period
@@ -31,11 +35,14 @@ for a440 in range(4300,4500):
 results.sort()
 best_error, best_a440 = results[0]
 best_a440 /= 10.0
+print '//', args
 print '//', best_a440, best_error, test_notes
 
 print "const int note_table[%d] = {" % final_notes
 for note in range(0,final_notes):
     notehz = best_a440 * math.pow(2.0, (note - 49) / 12.0);
     period = int(round(basehz / notehz)) - bias
+    while period > maxval:
+        period /= 2
     print '%d,' % period,
 print "};"