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This is a Python package for efficiently receiving data from DECTRIS detectors with the zeromq interface. The low-level, high-frequency operations are performed in a background thread implemented in rust, and multiple frames are batched together for further processing in Python.

Decoding of compressed frames is not (yet) handled in this package, but may be added later.


import libertem_dectris
from libertem_live.detectors.dectris.DEigerClient import DEigerClient

# trigger acquisition via the REST API, needs `libertem-live`
nimages = 512 * 512
ec = DEigerClient('localhost', 8910)  # hostname and port of the DCU REST API
ec.setDetectorConfig('ntrigger', 1)
ec.setDetectorConfig('nimages', 1)
ec.setDetectorConfig('trigger_mode', 'exte')
ec.setDetectorConfig('ntrigger', nimages)
result = ec.sendDetectorCommand('arm')
sequence_id = result['sequence id'] 

frames = libertem_dectris.FrameChunkedIterator(uri="tcp://localhost:9999")
# start to receive data for the given series
# (can be called multiple times on the same `FrameChunkedIterator` instance)

    while True:
        # get at most `max_size` frames as a stack
        # (might get less at the end of the acquisition)
        stack = frames.get_next_stack(max_size=32)
        for i in range(len(stack)):
            frame = stack[i]
            # do something with the frame; compression
            # is not handled in this module (yet)
            image_data_bytes = frame.get_image_data()
            shape = frame.get_shape()
            encoding = frame.get_encoding()
            frame_id = frame.get_frame_id()
        if len(stack) == 0:
    frames.close()  # clean up background thread etc.



  • Catch frame ID mismatch, PR #9


  • Added libertem_dectris.headers submodule that exports header classes
  • Added ways to create libertem_dectris.Frame and libertem_dectris.FrameStack objects from Python, mostly useful for testing
  • Added binding to random port for the simulator
  • Properly parametrize with zmq endpoint URI
  • Fix many clippy complaints


Initial release!


This package is using pyo3 with maturin to create the Python bindings. First, make sure maturin is installed in your Python environment:

(venv) $ pip install maturin

Then, after each change to the rust code, run maturin develop -r to build and install a new version of the wheel.


  • update changelog above
  • bump version in Cargo.toml if not already bumped, and push
  • create a release from the GitHub UI, creating a new tag vX.Y.Z
  • done!

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