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Stream large Intan RHD recordings to DAT files - #32
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Large RHD recordings currently require allocating the full recording in MATLAB before export. Add
read_Intan_RHD2000_file('streamToDat', true)to write amplifier, auxiliary, analog input, digital input, and timestamp DAT files one RHD block at a time.The export uses sample-interleaved analog channels, raw ADC counts, auxiliary samples repeated four times, packed digital words, and integer timestamp ticks. Amplifier centering and pre-v3 software notch filtering match the in-memory reader, with filter state carried between blocks. Reject incomplete blocks before exporting, check read/write counts, report timestamp gaps, and close input/output handles on errors.
The default workspace-loading behavior remains available. Streaming overwrites these five DAT files beside the selected RHD recording; it does not export supply, temperature, digital output, or header files. Recordings containing only a header retain the existing metadata-loading behavior.
Validation: all 10 regression tests passed locally in MATLAB R2025a. Synthetic multi-block recordings cover RHD versions 1.0–3.0, multi-channel ordering and digital bits, both notch frequencies, signed/unsigned timestamps, missing channels, malformed files, output-open failures, default loading, header-only files, and picker cancellation.
git diff --checkpassed; MATLAB Code Analyzer reported only the two existing unused-variable warnings. Large real recordings were not available for validation.Format reference: Intan RHD data file formats.