refactor header dataclasses

vban_cmd/packet.py

@@ -422,19 +422,38 @@ class VbanRtPacketNBS1(VbanRtPacket):
 class SubscribeHeader:
     """Represents the header of an RT subscription packet"""
 
-    ident: NBS = NBS.zero
-    name = 'Register-RTP'
-    timeout = 15
-    vban: bytes = 'VBAN'.encode()
-    format_sr: bytes = (VBAN_PROTOCOL_SERVICE).to_bytes(1, 'little')
-    format_nbs: bytes = (ident.value & 0xFF).to_bytes(1, 'little')
-    format_nbc: bytes = (VBAN_SERVICE_RTPACKETREGISTER).to_bytes(1, 'little')
-    format_bit: bytes = (timeout & 0xFF).to_bytes(1, 'little')  # timeout
-    streamname: bytes = name.encode('ascii') + bytes(16 - len(name))
+    nbs: NBS = NBS.zero
+    name: str = 'Register-RTP'
+    timeout: int = 15
+
+    @property
+    def vban(self) -> bytes:
+        return b'VBAN'
+
+    @property
+    def format_sr(self) -> bytes:
+        return VBAN_PROTOCOL_SERVICE.to_bytes(1, 'little')
+
+    @property
+    def format_nbs(self) -> bytes:
+        return (self.nbs.value & 0xFF).to_bytes(1, 'little')
+
+    @property
+    def format_nbc(self) -> bytes:
+        return VBAN_SERVICE_RTPACKETREGISTER.to_bytes(1, 'little')
+
+    @property
+    def format_bit(self) -> bytes:
+        return (self.timeout & 0xFF).to_bytes(1, 'little')
+
+    @property
+    def streamname(self) -> bytes:
+        return self.name.encode('ascii') + bytes(16 - len(self.name))
 
     @classmethod
     def to_bytes(cls, nbs: NBS, framecounter: int) -> bytes:
-        header = cls(ident=nbs)
+        header = cls(nbs=nbs)
+
         data = bytearray()
         data.extend(header.vban)
         data.extend(header.format_sr)
@@ -451,30 +470,31 @@ class VbanRtPacketHeader:
     """Represents the header of an RT response packet"""
 
     name: str = 'Voicemeeter-RTP'
-    vban: bytes = 'VBAN'.encode()
-    format_sr: bytes = (VBAN_PROTOCOL_SERVICE).to_bytes(1, 'little')
-    format_nbs: bytes = (0).to_bytes(1, 'little')
-    format_nbc: bytes = (VBAN_SERVICE_RTPACKET).to_bytes(1, 'little')
-    format_bit: bytes = (0).to_bytes(1, 'little')
-    streamname: bytes = name.encode('ascii') + bytes(16 - len(name))
+    format_sr: int = VBAN_PROTOCOL_SERVICE
+    format_nbs: int = 0
+    format_nbc: int = VBAN_SERVICE_RTPACKET
+    format_bit: int = 0
+
+    @property
+    def vban(self) -> bytes:
+        return b'VBAN'
+
+    @property
+    def streamname(self) -> bytes:
+        return self.name.encode('ascii') + bytes(16 - len(self.name))
 
     @classmethod
     def from_bytes(cls, data: bytes):
         if len(data) < HEADER_SIZE:
             raise ValueError('Data is too short to be a valid VbanRTPPacketHeader')
-        vban = data[0:4]
-        format_sr = data[4]
-        format_nbs = data[5]
-        format_nbc = data[6]
-        format_bit = data[7]
+
         name = data[8:24].rstrip(b'\x00').decode('utf-8')
         return cls(
             name=name,
-            vban=vban,
-            format_sr=format_sr & VBAN_SERVICE_MASK,
-            format_nbs=format_nbs,
-            format_nbc=format_nbc,
-            format_bit=format_bit,
+            format_sr=data[4] & VBAN_SERVICE_MASK,
+            format_nbs=data[5],
+            format_nbc=data[6],
+            format_bit=data[7],
         )
 
 
@@ -485,21 +505,30 @@ class RequestHeader:
     name: str
     bps_index: int
     channel: int
-    vban: bytes = 'VBAN'.encode()
-    nbs: bytes = (0).to_bytes(1, 'little')
-    bit: bytes = (0x10).to_bytes(1, 'little')
-    framecounter: bytes = (0).to_bytes(4, 'little')
+    framecounter: int = 0
 
     @property
-    def sr(self):
+    def vban(self) -> bytes:
+        return b'VBAN'
+
+    @property
+    def sr(self) -> bytes:
         return (VBAN_PROTOCOL_TXT + self.bps_index).to_bytes(1, 'little')
 
     @property
-    def nbc(self):
+    def nbs(self) -> bytes:
+        return (0).to_bytes(1, 'little')
+
+    @property
+    def nbc(self) -> bytes:
         return (self.channel).to_bytes(1, 'little')
 
     @property
-    def streamname(self):
+    def bit(self) -> bytes:
+        return (0x10).to_bytes(1, 'little')
+
+    @property
+    def streamname(self) -> bytes:
         return self.name.encode() + bytes(16 - len(self.name))
 
     @classmethod
@@ -509,6 +538,7 @@ class RequestHeader:
         header = cls(
             name=name, bps_index=bps_index, channel=channel, framecounter=framecounter
         )
+
         data = bytearray()
         data.extend(header.vban)
         data.extend(header.sr)