Add skeleton of Application and Channel parameter classes.

Add TODO in PrrtCodingParameters

prrt/prrt.pyx

@@ -106,6 +106,47 @@ cdef sockaddr_to_addr_and_port(sockaddr_in addr):
 class PayloadTooBigException(Exception):
     pass
 
+class PrrtChannelParameters:
+    def __init__(self,
+                 loss_rate_fwd,
+                 loss_rate_bwd,
+                 rtt_prop_fwd,
+                 rtt_prop_bwd,
+                 data_rate_btl_fwd,
+                 data_rate_btl_bwd):
+        self.loss_rate_fwd = loss_rate_fwd
+        self.loss_rate_bwd = loss_rate_bwd
+        self.rtt_prop_fwd = rtt_prop_fwd
+        self.rtt_prop_bwd = rtt_prop_bwd
+        self.data_rate_btl_fwd = data_rate_btl_fwd
+        self.data_rate_btl_bwd = data_rate_btl_bwd
+
+    def get_bandwidth_delay_fwd(self):
+        return self.data_rate_btl_fwd * self.rtt_prop_fwd
+
+    def get_bandwidth_delay_bwd(self):
+        return self.data_rate_btl_bwd * self.rtt_prop_bwd
+
+    # TODO
+    def get_ri_opt(self, applicationParameters):
+        return 0
+
+class ApplicationParameters:
+    # maxLatency float in seconds
+    # maxResidualLossRate in percent
+
+    def __init__(self, maxLatency, maxResidualLossRate):
+        self.maxLatency = maxLatency
+        self.maxResidualLossRate = maxResidualLossRate
+
+    def __repr__(self):
+        return "ApplicationParameters(maxLatency={},maxResidualLossRate={})".format(self.maxLatency,
+                                                                                    self.maxResidualLossRate)
+
+    def __str__(self):
+        return "({},{},{})".format(self.maxLatency, self.maxLatency)
+
+
 class PrrtCodingConfiguration:
     def __init__(self, n, k, n_cycle=None):
         if n < k:
@@ -128,6 +169,18 @@ class PrrtCodingConfiguration:
     def __str__(self):
         return "({},{},{})".format(self.n, self.k, self.n_cycle)
 
+    # TODO
+    # def __eq__()
+
+    # TODO
+    # Calculate the redundancy information this coding configuration causes, given a certain channel.
+    # ri = PrrtChannelParameters.get_ri_opt(applicationParameters)
+
+    # TODO
+    # Check if it is able to fulfill application parameters given channel parameters.
+    # def is_valid_for(applicationParameters, channelParameters)
+
+
 cdef class PrrtSocket:
     cdef cprrt.PrrtSocket* _c_socket
     _epoch = datetime.datetime.utcfromtimestamp(0)
@@ -141,21 +194,30 @@ cdef class PrrtSocket:
         cprrt.PrrtSocket_bind(self._c_socket, host.encode("utf8"), port)
 
     # Channel Properties
-    property data_rate_btl_fwd:
-        def __get__(self):
-            return cprrt.PrrtSocket_get_btlbw_fwd(self._c_socket)
-
-    property data_rate_btl_back:
-        def __get__(self):
-            return cprrt.PrrtSocket_get_btlbw_back(self._c_socket)
-
-    property rtt_prop_fwd:
-        def __get__(self):
-            return cprrt.PrrtSocket_get_rtprop_fwd(self._c_socket) * 0.000001
-
-    property loss_rate_fwd:
+    property prrtChannelParameters:
         def __get__(self):
-            return cprrt.PrrtSocket_get_plr_fwd(self._c_socket)
+            return PrrtChannelParameters(cprrt.PrrtSocket_get_plr_fwd(self._c_socket),
+                                         0, # TODO: Implement PrrtSocket_get_plr_bwd
+                                         cprrt.PrrtSocket_get_rtprop_fwd(self._c_socket) * 0.000001,
+                                         0, # TODO: Implement PrrtSocket_get_rtprop_bwd
+                                         cprrt.PrrtSocket_get_btlbw_fwd(self._c_socket),
+                                         cprrt.PrrtSocket_get_btlbw_back(self._c_socket))
+
+    # property data_rate_btl_fwd:
+    #     def __get__(self):
+    #         return cprrt.PrrtSocket_get_btlbw_fwd(self._c_socket)
+    #
+    # property data_rate_btl_back:
+    #     def __get__(self):
+    #         return cprrt.PrrtSocket_get_btlbw_back(self._c_socket)
+    #
+    # property rtt_prop_fwd:
+    #     def __get__(self):
+    #         return cprrt.PrrtSocket_get_rtprop_fwd(self._c_socket) * 0.000001
+    #
+    # property loss_rate_fwd:
+    #     def __get__(self):
+    #         return cprrt.PrrtSocket_get_plr_fwd(self._c_socket)
 
     # Application Properties
     property target_delay: