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Refactor channel inference in inferSubEpochChannels function to impro… #26

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Merged
yoshihito-saito merged 1 commit into from
Jul 31, 2026
Merged

Refactor channel inference in inferSubEpochChannels function to impro… #26

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32 changes: 16 additions & 16 deletions NeuroScope2.m
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Original file line number Diff line number Diff line change
Expand Up @@ -8056,24 +8056,24 @@ function MsgLog(message,priority)

function [fileNChannels, dataChannels, excludedChannels, fileNSamples] = inferSubEpochChannels(filename, expectedSamples, nChannels, sampleBytes)
fileInfo = dir(filename);
if isempty(expectedSamples)
fileNChannels = nChannels;
fileNSamples = fileInfo.bytes / (fileNChannels * sampleBytes);
else
candidateSamples = unique([expectedSamples, expectedSamples + 1, expectedSamples - 1], 'stable');
candidateSamples = candidateSamples(candidateSamples > 0);
candidateNChannels = fileInfo.bytes ./ (candidateSamples * sampleBytes);
isIntegerChannelCount = abs(candidateNChannels - round(candidateNChannels)) <= 1e-9;
isUsableChannelCount = isIntegerChannelCount & round(candidateNChannels) >= nChannels;
if ~any(isUsableChannelCount)
error('NeuroScope2: Could not infer integer channel count for %s from %d samples and %d bytes.', filename, expectedSamples, fileInfo.bytes)
end
bestIdx = find(isUsableChannelCount, 1, 'first');
fileNSamples = candidateSamples(bestIdx);
fileNChannels = round(candidateNChannels(bestIdx));
fileNChannels = nChannels;
bytesPerSample = fileNChannels * sampleBytes;
remainderBytes = rem(fileInfo.bytes, bytesPerSample);
if remainderBytes ~= 0
error('NeuroScope2:InvalidSubEpochFileSize', ...
'Sub-epoch dat file %s has %d bytes, which is not divisible by %d channels and %d bytes/sample.', ...
filename, fileInfo.bytes, fileNChannels, sampleBytes)
end

fileNSamples = fileInfo.bytes / bytesPerSample;
if ~isempty(expectedSamples) && abs(fileNSamples - expectedSamples) > 1
warning('NeuroScope2:SubEpochSampleCountMismatch', ...
'Sub-epoch dat file %s has %d samples by file size, but metadata expected %d samples. Using file-derived sample count.', ...
filename, fileNSamples, expectedSamples)
end

dataChannels = 1:nChannels;
excludedChannels = nChannels+1:fileNChannels;
excludedChannels = [];
end

function sampleBytes = getPrecisionBytes(precision)
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