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ObsessiveCompulsiveAudiophileObsessiveCompulsiveAudiophile
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‎ExtractAllMeasurements_mqx.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<style>
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button {
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padding: 10px 20px;
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font-size: 16px;
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background-color: yellowgreen;
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color: darkred;
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border: thin;
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cursor: pointer;
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border-radius: 4px;
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}
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button:hover {
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background-color: #45a049;
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}
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</style>
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</head>
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<body>
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<h2>MultEQ-X measurement extractor by OCA</h2>
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<br>
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<label for="input">Select .mqx file to upload:</label>
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<input type="file" id="input" accept=".mqx">
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<br>
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<p style="font-size: small; color: red;">Remember to upload ACM1HB standard mic calibration file (included in the ZIP) to REW before importing measurements for more accurate responses!</p>
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<br>
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<br>
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<button onclick="decodeAndConvert()">
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Decode, convert and save<br>measurements for REW
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</button>
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<p id="message" style="display: none;">Please wait, working on the zip...</p>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.0/FileSaver.min.js"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.6.0/jszip.min.js"></script>
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<script>
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async function decodeAndConvert() {
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const button = document.querySelector('button');
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button.disabled = true; // Disable the button
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const message = document.getElementById('message');
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message.style.display = 'block'; // Show the message
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const input = document.getElementById('input');
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const file = input.files[0];
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const text = await file.text();
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const jsonData = JSON.parse(text);
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const channelMap = {};
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const channelDataMap = jsonData._channelDataMap;
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for (const channelGuid in channelDataMap) {
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const metadata = channelDataMap[channelGuid].Metadata;
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channelMap[channelGuid] = metadata.AvrOriginatingDesignation;
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}
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const zip = new JSZip();
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const measurements = jsonData._measurements;
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const trimPositionGuids = jsonData.CalibrationSettings.TrimPositionGuids;
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const distancePoisitionGuid = jsonData.CalibrationSettings.DistancePoisitionGuid;
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measurements.forEach((measurement, index) => {
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const base64String = measurement.Data;
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const bytesArray = new Uint8Array(atob(base64String).split('').map(c => c.charCodeAt(0)));
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const floats = [];
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for (let i = 0; i < bytesArray.length; i += 4) {
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floats.push(readFloat(bytesArray, i));
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}
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const channelGuid = measurement.ChannelGuid;
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const positionGuid = measurement.PositionGuid;
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const avrOriginatingDesignation = channelMap[channelGuid];
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const positionIndex = trimPositionGuids.indexOf(positionGuid);
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const isDistancePosition = positionGuid === distancePoisitionGuid;
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let filename;
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if (positionIndex === -1) {
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const shortenedGuid = positionGuid.substring(0, 3);
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filename = isDistancePosition
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? `${avrOriginatingDesignation}_${shortenedGuid}_dp.txt`
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: `${avrOriginatingDesignation}_${shortenedGuid}.txt`;
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} else {
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filename = isDistancePosition
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? `${avrOriginatingDesignation}_${positionIndex}_dp.txt`
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: `${avrOriginatingDesignation}_${positionIndex}.txt`;
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}
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const txtContent = `* Impulse Response data saved by REW
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0 // Peak value before normalisation
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0 // Peak index
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16384 // Response length
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2.0833333333333333E-5 // Sample interval (seconds)
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0.0 // Start time (seconds)
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* Data start
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${floats.join('\n')}`;
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zip.file(filename, txtContent);
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});
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const zipBlob = await zip.generateAsync({ type: 'blob' });
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saveAs(zipBlob, 'REW_Measurements.zip');
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message.style.display = 'none'; // Hide the message
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button.disabled = false; // Enable the button
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}
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function readFloat(bytesArray, start) {
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const dv = new DataView(bytesArray.buffer);
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const intBits = dv.getUint32(start, true);
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const signBit = (intBits >> 31) & 0x1;
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const exponent = (intBits >> 23) & 0xFF;
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const mantissa = intBits & 0x7FFFFF;
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if (exponent === 0xFF) {
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if (mantissa === 0) {
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return signBit ? Number.NEGATIVE_INFINITY : Number.POSITIVE_INFINITY;
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} else {
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return NaN;
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}
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}
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const bias = 127;
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const normalizedMantissa = 1 + mantissa / Math.pow(2, 23);
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const value = Math.pow(-1, signBit) * normalizedMantissa * Math.pow(2, exponent - bias);
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return value;
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}
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</script>
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</body>
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</html>

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