ASAM MDF measurement data file parser
Project description
asammdf is a fast parser/editor for ASAM (Associtation for Standardisation of Automation and Measuring Systems) MDF (Measurement Data Format) files. Currently only version 3 is supported.
Project goals
The main goals for this library are:
to be faster than the other Python based mdf libraries
clean and simple data types
Dependencies
asammdf uses the following libraries
numpy : the heart that makes all tick
numexpr : for formula based channel conversions
blosc : optionally used for in memmory raw channel data compression
Usage
from asammdf import MDF3
mdf = MDF3('sample.mdf')
speed = mdf.get_signal_by_name('WheelSpeed')Features
read sorted and unsorted MDF v3 files
- files are loaded in RAM for fast operations
for low memory computers or for large data files there is the option to load only the metadata and leave the raw channel data (the samples) unread; this of course will mean slower channel data access speed
extract channel data, master channel and extra channel information (unit, conversion rule)
remove channel by name
remove data group by specifing a channel name inside the target data group
append new channels
Benchmarks
using a more complex file of 170MB with 180 data groups and 36000 channels with Python 3.6.1 32bit
- file load:
asammdf 1.0.0 : 1040ms
mdfreader 0.2.4 : 3986ms
- file save:
asammdf 1.0.0 : 722ms
mdfreader 0.2.4 : 18800ms
- get channel data (10000 calls):
asammdf 1.0.0 : 918ms
mdfreader 0.2.4 : 11ms
- RAM usage with loaded raw channel data:
asammdf 1.0.0 : 280MB
mdfreader 0.2.4 : 441MB
- RAM usage without loaded raw channel data:
asammdf 1.0.0 : 118MB
mdfreader 0.2.4 : 300MB
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