openwebrx-clone/owrx/source/direct.py

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from abc import ABCMeta
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from owrx.source import SdrSource, SdrDeviceDescription
from csdr.chain import Chain
from typing import Optional
from pycsdr.modules import Buffer
from pycsdr.types import Format
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class DirectSource(SdrSource, metaclass=ABCMeta):
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def __init__(self, id, props):
self._conversion = None
super().__init__(id, props)
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def onPropertyChange(self, changes):
self.logger.debug("restarting sdr source due to property changes: {0}".format(changes))
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self.stop()
self.sleepOnRestart()
self.start()
def nmux_memory(self):
# in megabytes. This sets the approximate size of the circular buffer used by nmux.
return 50
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def getNmuxCommand(self):
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props = self.sdrProps
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nmux_bufcnt = nmux_bufsize = 0
while nmux_bufsize < props["samp_rate"] / 4:
nmux_bufsize += 4096
while nmux_bufsize * nmux_bufcnt < self.nmux_memory() * 1e6:
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nmux_bufcnt += 1
if nmux_bufcnt == 0 or nmux_bufsize == 0:
raise ValueError("Error: unable to calculate nmux buffer parameters.")
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return [
"nmux --bufsize %d --bufcnt %d --port %d --address 127.0.0.1"
% (
nmux_bufsize,
nmux_bufcnt,
self.port,
)
]
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def getCommand(self):
return super().getCommand() + self.getNmuxCommand()
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# override this in subclasses, if necessary
def getFormatConversion(self) -> Optional[Chain]:
return None
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def _getTcpSourceFormat(self):
conversion = self.getFormatConversion()
return Format.COMPLEX_FLOAT if conversion is None else conversion.getInputFormat()
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# override this in subclasses, if necessary
def sleepOnRestart(self):
pass
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def getBuffer(self):
if self.buffer is None:
source = self._getTcpSource()
buffer = Buffer(source.getOutputFormat())
source.setWriter(buffer)
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self._conversion = self.getFormatConversion()
if self._conversion is not None:
self._conversion.setReader(buffer.getReader())
# this one must be COMPLEX_FLOAT
buffer = Buffer(Format.COMPLEX_FLOAT)
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self._conversion.setWriter(buffer)
self.buffer = buffer
return self.buffer
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class DirectSourceDeviceDescription(SdrDeviceDescription):
pass