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InputFile.py
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InputFile.py
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# rigolrdout - Read data and screenshots from Rigol oscilloscopes
# Copyright (C) 2012-2018 Johannes Bauer
#
# This file is part of rigolrdout.
#
# rigolrdout is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; this program is ONLY licensed under
# version 3 of the License, later versions are explicitly excluded.
#
# rigolrdout is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with rigolrdout; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Johannes Bauer <JohannesBauer@gmx.de>
import os
import json
import base64
import gzip
import hashlib
import sys
import tempfile
import subprocess
class UnableToLoadStorageException(Exception): pass
class RigolWaveformInterpreter(object):
_COLORS = {
0: "f1c40f", # yellow
1: "3498db", # blue
2: "e82dc6", # pink
3: "8e44ad", # purple
}
def __init__(self, args, inputfile):
self._args = args
self._input = inputfile
self._waveforms = list(self._input.iter_waveform())
def _interpret_waveform(self, waveform):
(name, meta, data) = waveform
for (i, value) in enumerate(data, -self._input["acquisition_info"]["trigger"]["position"] + 1):
x = (i - meta["x_origin"]["flt"] - meta["x_reference"]) * meta["x_increment"]["flt"]
y = (value - meta["y_origin"]["flt"] - meta["y_reference"]) * meta["y_increment"]["flt"]
yield (x, y)
def _waveform_color(self, channel_id):
return self._COLORS[(channel_id - 1) % len(self._COLORS)]
@staticmethod
def _get_unit(unit):
if unit is None:
return ("", 1)
return {
"m": ("m", 1e-3),
"u": ("µ", 1e-6),
"n": ("n", 1e-9),
}[unit]
def write_gpl(self, f):
(xunit, xunit_value) = self._get_unit(self._args.x_unit)
(yunit, yunit_value) = self._get_unit(self._args.y_unit)
print("# %d waveform(s)" % (len(self._waveforms)), file = f)
print("set terminal pngcairo size %s,%s" % (self._args.width, self._args.height), file = f)
if self._input.get("comment"):
print("set title \"%s\"" % (self._input["comment"]), file = f)
else:
print("set title \"%s %s\"" % (self._input["instrument"]["vendor"], self._input["instrument"]["device"]), file = f)
print("set xlabel \"x / %ss\"" % (xunit), file = f)
print("set ylabel \"y / %sV\"" % (yunit), file = f)
print("set ytics nomirror", file = f)
print("set grid", file = f)
print("set samples 2000", file = f)
plotcmds = [ ]
for (name, meta, data) in self._waveforms:
single_cmd = [ "'-' using" ]
if not self._args.honor_offsets:
(xplot, yplot) = ("$1", "$2")
else:
channel_id = str(meta["channel"])
xplot = "$1-%f" % (self._input["acquisition_info"]["timebase"]["offset"]["flt"])
yplot = "$2+%f" % (self._input["channel_info"][channel_id]["offset"]["flt"])
if xunit_value != 1:
xplot = "(%s)/%e" % (xplot, xunit_value)
if yunit_value != 1:
yplot = "(%s)/%e" % (yplot, yunit_value)
single_cmd.append("(%s):(%s)" % (xplot, yplot))
single_cmd.append("with lines")
if self._args.smooth_waveform:
single_cmd.append("smooth cspline")
single_cmd.append("title \"Channel %d\"" % (meta["channel"]))
single_cmd.append("lc \"#%s\"" % (self._waveform_color(meta["channel"])))
single_cmd.append("lw 2")
plotcmds.append(" ".join(single_cmd))
plotcmd = "plot %s" % (", ".join(plotcmds))
print(plotcmd, file = f)
print(file = f)
for waveform in self._waveforms:
for (x, y) in self._interpret_waveform(waveform):
print("%.4e %.4e" % (x, y), file = f)
print("end", file = f)
print(file = f)
def write(self, filename, out_format):
assert(out_format in [ "gnuplot", "png" ])
if out_format == "gnuplot":
with open(filename, "w") as f:
self.write_gpl(f)
elif out_format == "png":
with tempfile.NamedTemporaryFile(prefix = "plot_", suffix = ".gpl", mode = "w") as f:
self.write_gpl(f)
f.flush()
png = subprocess.check_output([ "gnuplot", f.name ])
with open(filename, "wb") as f:
f.write(png)
class InputFile(object):
def __init__(self, args, filename):
self._args = args
with open(filename) as f:
self._meta = json.loads(f.read())
self._storage = self._load_storage()
def _load_storage(self):
storage = { }
for (blob_name, blob_data) in self._meta["data"].items():
try:
data = self._load_blob(blob_data)
storage[blob_name] = data
except UnableToLoadStorageException as e:
print("Cannot load storage %s: %s -- ignoring this data chunk." % (blob_name, str(e)))
return storage
def _load_blob(self, blob_data):
if blob_data["storage"] == "inline":
data = self._load_inline_blob(blob_data)
elif blob_data["storage"] == "external":
data = self._load_external_blob(blob_data)
else:
raise UnableToLoadStorageException("Unknown storage format '%s'." % (blob_data["storage"]))
hashval = hashlib.sha256(data).hexdigest()
if hashval != blob_data["sha256"]:
raise UnableToLoadStorageException("SHA256 of blob does not match recorded data. Tampered/corrupt data or wrong file reference.")
return data
def _load_inline_blob(self, blob_data):
return gzip.decompress(base64.b64decode(blob_data["gzip_compressed_data"]))
def _load_external_blob(self, blob_data):
if self._args.search_path is not None:
search_path = self._args.search_path
else:
search_path = os.path.dirname(self._args.inputfile)
if not search_path.endswith("/"):
search_path += "/"
full_filename = search_path + blob_data["filename"]
if os.path.isfile(full_filename):
with open(full_filename, "rb") as f:
return f.read()
if os.path.isfile(full_filename + ".gz"):
with gzip.open(full_filename + ".gz") as f:
return f.read()
raise UnableToLoadStorageException("File not found: %s" % (full_filename))
def write_waveform(self, outputfile, out_format = "gnuplot"):
assert(out_format in [ "gnuplot", "png" ])
waveform_interpreter = RigolWaveformInterpreter(self._args, self)
waveform_interpreter.write(outputfile, out_format)
def write_hardcopy(self, outputfile):
for (blob_name, blob_meta, data) in self.iter_hardcopy():
with open(outputfile, "wb") as f:
f.write(data)
print("Wrote hardcopy \"%s\" to %s." % (blob_name, outputfile), file = sys.stderr)
break
def iter_type(self, typename):
for (blob_name, blob_meta, storage) in self:
if blob_meta["type"] == typename:
yield (blob_name, blob_meta, storage)
def iter_hardcopy(self):
return self.iter_type("hardcopy")
def iter_waveform(self):
return self.iter_type("waveform")
def get(self, key):
return self._meta.get(key)
def __getitem__(self, key):
return self._meta[key]
def __iter__(self):
for (blob_name, blob_data) in sorted(self._meta["data"].items(), key = lambda v: (v[1].get("channel", 0), v[0])):
if blob_name in self._storage:
yield (blob_name, blob_data["meta"], self._storage[blob_name])