A FIT file parsing and decoding library written in Python3 (3.6+ only).
Read a FIT file, frame by frame:
import fitdecode
with fitdecode.FitReader('file.fit') as fit:
for frame in fit:
# The yielded frame object is of one of the following types:
# * fitdecode.FitHeader
# * fitdecode.FitDefinitionMessage
# * fitdecode.FitDataMessage
# * fitdecode.FitCRC
if isinstance(frame, fitdecode.FitDataMessage):
# Here, frame is a FitDataMessage object.
# A FitDataMessage object contains decoded values that
# are directly usable in your script logic.
print(frame.name)
fitjson and fittxt export JSON and txt files:
$ fitjson in_file.fit -o out_file.json
fitdecode is available on PyPI:
$ pip install fitdecode
Or, to get the latest working version, you can clone fitdecode's source code repository before installing it:
$ git clone [email protected]:polyvertex/fitdecode.git $ cd fitdecode $ python setup.py test # optional step to run unit tests $ python setup.py install
Note that for convenience, the cmd
directory located at the root of the
source code tree can safely be added to your PATH
, so that fitdecode
commands can be called without the package to be installed.
fitdecode is a non offensive and incompatible rewrite of the fitparse library, with some improvements and additional features, as well as efforts made to optimize both speed and memory usage.
Main differences between fitdecode and fitparse:
- fitdecode requires Python version 3.6 or greater
- fitdecode is faster
- fitdecode allows concurrent reading of multiple files by being thread-safe, in the sense that fitdecode's objects keep their state stored locally
- fitdecode high-level interface - FitReader - is not compatible with fitparse's FitFile
- fitdecode does not discard the FIT header and the CRC footer while iterating a file, which allow to get a complete 1:1 representation of the file that is being read
- This also allows the client to easily deal with so-called chained FIT files, as per FIT SDK definition (i.e. concatenated FIT files)
- CRC computation and matching are both optional. CRC can be matched, only computed, or fully ignored for faster reading.
- fitdecode offers optional access to records, headers and footers in their binary form, to allow FIT file cutting, stitching and filtering at binary level
A new library has been created instead of just offering to patch fitparse because many changes and adds in fitdecode break fitparse's backward compatibilty and because it allowed more freedom during the development of fitdecode.
Documentation is available at http://fitdecode.readthedocs.io/
This project is distributed under the terms of the MIT license. See the LICENSE.txt file for details.
fitdecode is largely based on the generic approach adopted by fitparse to
define FIT types and to decode raw values. That includes the module
profile.py
and all the classes it refers to, as well as the script
generate_profile.py
.