code: def setCodecPreferences(self, codecs):
          
          if not codecs:
              self._preferred_codecs = []
  
          capabilities = get_capabilities(self.kind).codecs
          unique = []
          for codec in reversed(codecs):
              if codec not in capabilities:
                  raise ValueError('Codec is not in capabilities')
              if codec not in unique:
                  unique.insert(0, codec)
          self._preferred_codecs = unique
docs: Override the default codec preferences.
  
          See :meth:`RTCRtpSender.getCapabilities` and :meth:`RTCRtpReceiver.getCapabilities`
          for the supported codecs.
  
          :param: codecs: A list of :class:`RTCRtpCodecCapability`, in decreasing order
                          of preference. If empty, restores the default preferences.