moved codec2 to tnc folder

preparation for migration to codec2 module for the entire TNC

test/001_highsnr_stdio_audio/test_multimode_rx.py

@@ -9,8 +9,8 @@ import sys
 import ctypes
 from ctypes import *
 import pathlib
-sys.path.insert(0,'..')
-import codec2
+sys.path.insert(0,'../..')
+from tnc import codec2
 import numpy as np
 
 #--------------------------------------------GET PARAMETER INPUTS  

test/001_highsnr_stdio_audio/test_multimode_tx.py

@@ -11,8 +11,8 @@ import threading
 import audioop
 import argparse
 import sys
-sys.path.insert(0,'..')
-import codec2
+sys.path.insert(0,'../..')
+from tnc import codec2
 import numpy as np        
 
 # GET PARAMETER INPUTS  

test/001_highsnr_stdio_audio/test_rx.py

@@ -17,8 +17,9 @@ import threading
 import sys
 import argparse
 import numpy as np
-sys.path.insert(0,'..')
-import codec2
+sys.path.insert(0,'../..')
+from tnc import codec2
+
 
 #--------------------------------------------GET PARAMETER INPUTS  
 parser = argparse.ArgumentParser(description='Simons TEST TNC')

test/001_highsnr_stdio_audio/test_tx.py

@@ -9,8 +9,8 @@ import pyaudio
 import time
 import argparse
 import sys
-sys.path.insert(0,'..')
-import codec2
+sys.path.insert(0,'../..')
+from tnc import codec2
 import numpy as np
 
 # GET PARAMETER INPUTS  

tnc/codec2.py

@@ -139,7 +139,8 @@ class resampler:
         print("create 48<->8 kHz resampler")
         self.filter_mem8 = np.zeros(self.MEM8, dtype=np.int16)
         self.filter_mem48 = np.zeros(self.MEM48)
-
+        
+        
     def resample48_to_8(self,in48):
         assert in48.dtype == np.int16
         # length of input vector must be an integer multiple of api.FDMDV_OS_48