wavetable loading checkpoint

scripts/generate_wavetable.py

@@ -3,30 +3,60 @@
 # a wavetable file consists of a one-dimensional array of samples representing one period of a waveform
 # metadata includes: 
 #    - file version (for program compatibility)
-#    - binary format (float, double, int32, etc.)
+#    - binary format (float, double, int32, etc.) (RIGHT NOW I ONLY USE FLOAT)
 #    - domain (normal is a phase from x=0 to x=2pi)
 #    - range (depending on datatypes, e.g. float=[-1,1], int32=[-2^15, 2^15-1])
 #    - waveform RMS (for loudness normalization)
+#    - sample count 
 # the synth program uses the filename, not any metadata
 
 # this script uses the function defined in example_wavetable.py to calculate samples
 # if you want a custom wavetable, copy/edit/modify the example function (desmos is great for brainstorming)
 
+from array import array
+import math
+
 import example_wavetable
 
+wavetableLength = 2048
+
 def createFile():
     print("creating file")
-    return 1
+    file = open("sine.wt", "wb")
+    return file
 
 def writeMetadata(file):
-    print("im writing metadata")
+    print(">> im writing metadata")
 
 def generateWavetable(file):
-    print("im generating the wavetable")
-    example_wavetable.process()
+    print(">> im generating the wavetable")
 
-def closeFile(file):
-    print("finishing up")
+    # init variables
+    data_list = [None] * wavetableLength
+    phaseInc = 2*math.pi / wavetableLength
+    x = 0
+    accumulator = 0
+
+    # generate each discrete sample
+    for i in range(wavetableLength): 
+        sample = example_wavetable.process(x)
+        accumulator += sample * sample
+        x += phaseInc
+        data_list[i] = sample
+
+    # normalize by rms
+    rms = math.sqrt(accumulator/wavetableLength)
+    print(">> wavetable RMS: ", rms)
+    for i in range(wavetableLength): 
+        data_list[i] /= rms
+
+    # write to file
+    binary_data = array("f", data_list)
+    file.write(binary_data)
+
+def closeFile(file): 
+    print(">> finishing up")
+    file.close()
 
 def main():
     print("Hello main")