86 lines
2.7 KiB
Python
86 lines
2.7 KiB
Python
from csdr.chain import Chain
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from pycsdr.modules import Fft, LogPower, LogAveragePower, FftSwap, FftAdpcm
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class FftAverager(Chain):
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def __init__(self, fft_size, fft_averages):
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self.fftSize = fft_size
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self.fftAverages = fft_averages
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workers = [self._getWorker()]
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super().__init__(*workers)
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def setFftAverages(self, fft_averages):
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if self.fftAverages == fft_averages:
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return
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self.fftAverages = fft_averages
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self.replace(0, self._getWorker())
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def _getWorker(self):
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if self.fftAverages == 0:
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return LogPower(add_db=-70)
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else:
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return LogAveragePower(add_db=-70, fft_size=self.fftSize, avg_number=self.fftAverages)
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class FftChain(Chain):
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def __init__(self, samp_rate, fft_size, fft_v_overlap_factor, fft_fps, fft_compression):
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self.sampleRate = samp_rate
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self.vOverlapFactor = fft_v_overlap_factor
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self.fps = fft_fps
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self.size = fft_size
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self.blockSize = 0
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self.fft = Fft(size=self.size, every_n_samples=self.blockSize)
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self.averager = FftAverager(fft_size=self.size, fft_averages=10)
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self.fftExchangeSides = FftSwap(fft_size=self.size)
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workers = [
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self.fft,
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self.averager,
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self.fftExchangeSides,
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]
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self.compressFftAdpcm = None
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if fft_compression == "adpcm":
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self.compressFftAdpcm = FftAdpcm(fft_size=self.size)
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workers += [self.compressFftAdpcm]
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self._updateParameters()
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super().__init__(*workers)
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def _setBlockSize(self, fft_block_size):
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if self.blockSize == int(fft_block_size):
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return
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self.blockSize = int(fft_block_size)
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self.fft.setEveryNSamples(self.blockSize)
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def setVOverlapFactor(self, fft_v_overlap_factor):
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if self.vOverlapFactor == fft_v_overlap_factor:
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return
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self.vOverlapFactor = fft_v_overlap_factor
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self._updateParameters()
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def setFps(self, fft_fps):
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if self.fps == fft_fps:
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return
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self.fps = fft_fps
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self._updateParameters()
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def setSampleRate(self, samp_rate):
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if self.sampleRate == samp_rate:
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return
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self.sampleRate = samp_rate
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self._updateParameters()
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def _updateParameters(self):
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fftAverages = 0
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if self.vOverlapFactor > 0:
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fftAverages = int(round(1.0 * self.sampleRate / self.size / self.fps / (1.0 - self.vOverlapFactor)))
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self.averager.setFftAverages(fftAverages)
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if fftAverages == 0:
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self._setBlockSize(self.sampleRate / self.fps)
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else:
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self._setBlockSize(self.sampleRate / self.fps / fftAverages)
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