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