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test/TEST_RX.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Tue Dec 15 18:29:22 2020
+
+@author: DJ2LS
+"""
+
+
+import ctypes
+from ctypes import *
+import pathlib
+
+import binascii #required for string.to_bytes() function
+import sys
+import audioop
+
+def main():
+    
+    modem = FreeDV() #Load FreeDV Class as "modem"
+      
+    #data = b'TEST' #byte string which will be send    
+    
+    #data = sys.stdin.read()
+    #for line in sys.stdin.buffer:
+    #    print(line)
+    #    data = sys.stdin.buffer.read()
+    #data = sys.stdin.flush()
+    #data = audioop.ratecv(data,2,1,48000, 8000, None)
+        #print(data)
+    #    demodulated_data = modem.Demodulate(data) #Call Modulate function, which  modulates data and prints it to the terminal
+
+    data = sys.stdin.buffer.read()
+    demodulated_data = modem.Demodulate(data)
+
+
+class FreeDV():
+    
+    def __init__(self):
+
+        libname = pathlib.Path().absolute() / "libcodec2.so"
+        self.c_lib = ctypes.CDLL(libname) # Load FreeDV shared libary
+        
+        self.freedv = self.c_lib.freedv_open(12) #Set FreeDV waveform ( 10,11,12 --> DATA1-3 )
+        
+        self.bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(self.freedv)/8)  #get bytes per frame from selected waveform
+        self.payload_per_frame = self.bytes_per_frame -2 #get frame payload because of 2byte CRC16 checksum
+        self.n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(self.freedv) 
+   
+    
+   
+    
+    # MODULATION-IN OBJECT   
+    def ModulationIn(self):
+        return (c_short * self.n_max_modem_samples)  ##
+        #return (c_short * 40000)
+    
+    # Pointer for changing buffer data type 
+    def FrameBytes(self):
+        return (c_ubyte * self.bytes_per_frame)
+    # Modulate function which returns modulated data
+    def Demodulate(self,data_in):
+         
+         buffer = bytearray(len(self.ModulationIn()())*sizeof(c_short)) # create empty byte array  
+         #buffer = bytearray(40000)
+         buffer[:len(data_in)] = data_in # copy across what we have
+         
+         modulation = self.ModulationIn() # get an empty modulation array
+         modulation = modulation.from_buffer_copy(buffer) # copy buffer across and get a pointer to it.
+
+         #print(bytes(modulation))
+         bytes_out = self.FrameBytes()() # initilize a pointer to where bytes will be outputed
+         #print(data_in)
+         nbytes = self.c_lib.freedv_rawdatarx(self.freedv, bytes_out, data_in)
+      
+         nin = self.c_lib.freedv_nin(self.freedv)
+         
+         #print(len(modulation))
+         #print(len(data_in))
+         #print(len(buffer))        
+         #print(self.n_max_modem_samples)
+
+         #print(nin)
+
+         print(self.c_lib.freedv_get_sync(self.freedv))
+         if nbytes != 0:
+             print(bytes(bytes_out))
+        
+         print(bytes(bytes_out))   
+        #print(nbytes)
+         #print(self.c_lib.freedv_get_total_bits_coded(self.freedv))
+         #print(self.c_lib.freedv_get_total_bit_errors_coded(self.freedv))
+main()