from .direct import DirectSource import logging logger = logging.getLogger(__name__) class Resampler(DirectSource): def onPropertyChange(self, changes): logger.warning("Resampler is unable to handle property changes: {0}".format(changes)) def __init__(self, props, sdr): sdrProps = sdr.getProps() self.shift = (sdrProps["center_freq"] - props["center_freq"]) / sdrProps["samp_rate"] self.decimation = int(float(sdrProps["samp_rate"]) / props["samp_rate"]) if_samp_rate = sdrProps["samp_rate"] / self.decimation self.transition_bw = 0.15 * (if_samp_rate / float(sdrProps["samp_rate"])) props["samp_rate"] = if_samp_rate self.sdr = sdr super().__init__(None, props) def getCommand(self): return [ "nc -v 127.0.0.1 {nc_port}".format(nc_port=self.sdr.getPort()), "csdr shift_addfast_cc {shift}".format(shift=self.shift), "csdr fir_decimate_cc {decimation} {ddc_transition_bw} HAMMING".format( decimation=self.decimation, ddc_transition_bw=self.transition_bw ), ] + self.getNmuxCommand() def activateProfile(self, profile_id=None): logger.warning("Resampler does not support setting profiles") pass def validateProfiles(self): # resampler does not support profiles pass