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DiskWriter::transport_looped() is called from the session when engine loops. This does not take local disk-reader run() latency offset into account. finish_capture() needs to be postponed until the disk-writer itself reaches the loop-position. This is achieved by postponing loop() and calling it once loop-length of samples has been captured. This works because engaging loop always seeks to the loop-position and first loop resets _capture_captured.
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