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#!/usr/bin/env python3
import json
from pathlib import Path
import lzma
import click
import RigolWFM.wfm as rigol
import scipy
@click.command()
@click.argument('infile', type=click.Path(dir_okay=False, exists=True))
@click.argument('outfile', type=click.Path(dir_okay=False, path_type=Path), required=False)
@click.option('-f', '--factor', type=int, default=500, help='Downsampling factor')
def cli(infile, outfile, factor):
if outfile is None:
outfile = Path(infile).with_suffix('.lzjson')
wf = rigol.Wfm.from_file(infile, 'DS1054Z')
data = wf.channels[0].volts
data = scipy.signal.decimate(data, factor, ftype='fir')[::-1]
td = wf.channels[0].seconds_per_point * factor
outfile.write_bytes(lzma.compress(json.dumps({'sample_interval_s': td, 'samples': list(data)}).encode()))
if __name__ == '__main__':
cli()
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