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remotion/node_modules/@remotion/media-utils/dist/get-wave-form-samples.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getWaveformSamples = void 0;
+const normalize_data_1 = require("./normalize-data");
+const getWaveformSamples = ({ audioBuffer, numberOfSamples, outputRange, normalize, }) => {
+    const blockSize = Math.floor(audioBuffer.length / numberOfSamples); // the number of samples in each subdivision
+    if (blockSize === 0) {
+        return [];
+    }
+    const filteredData = [];
+    for (let i = 0; i < numberOfSamples; i++) {
+        const blockStart = blockSize * i; // the location of the first sample in the block
+        let sum = 0;
+        for (let j = 0; j < blockSize; j++) {
+            sum += Math.abs(audioBuffer[blockStart + j]); // find the sum of all the samples in the block
+        }
+        filteredData.push(sum / blockSize); // divide the sum by the block size to get the average
+    }
+    if (normalize) {
+        if (outputRange === 'minus-one-to-one') {
+            return (0, normalize_data_1.normalizeData)(filteredData).map((n, i) => {
+                if (i % 2 === 0) {
+                    return n * -1;
+                }
+                return n;
+            });
+        }
+        return (0, normalize_data_1.normalizeData)(filteredData);
+    }
+    if (outputRange === 'minus-one-to-one') {
+        return filteredData.map((n, i) => {
+            if (i % 2 === 0) {
+                return n * -1;
+            }
+            return n;
+        });
+    }
+    return filteredData;
+};
+exports.getWaveformSamples = getWaveformSamples;