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remotion/node_modules/@remotion/media-utils/dist/fft/get-visualization.js

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+"use strict";
+// Adapted from node-fft project by Joshua Wong and Ben Bryan
+// https://github.com/vail-systems/node-fft
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getVisualization = void 0;
+const fft_accurate_1 = require("./fft-accurate");
+const fft_fast_1 = require("./fft-fast");
+const mag_1 = require("./mag");
+const smoothing_1 = require("./smoothing");
+const to_int_16_1 = require("./to-int-16");
+const getVisualization = ({ sampleSize, data, sampleRate, frame, fps, maxInt, optimizeFor, dataOffsetInSeconds, }) => {
+    const isPowerOfTwo = sampleSize > 0 && (sampleSize & (sampleSize - 1)) === 0;
+    if (!isPowerOfTwo) {
+        throw new TypeError(`The argument "bars" must be a power of two. For example: 64, 128. Got instead: ${sampleSize}`);
+    }
+    if (!fps) {
+        throw new TypeError('The argument "fps" was not provided');
+    }
+    if (data.length < sampleSize) {
+        throw new TypeError('Audio data is not big enough to provide ' + sampleSize + ' bars.');
+    }
+    const start = Math.floor((frame / fps - dataOffsetInSeconds) * sampleRate);
+    const actualStart = Math.max(0, start - sampleSize / 2);
+    const ints = new Int16Array({
+        length: sampleSize,
+    });
+    ints.set(data.subarray(actualStart, actualStart + sampleSize).map((x) => (0, to_int_16_1.toInt16)(x)));
+    const alg = optimizeFor === 'accuracy' ? fft_accurate_1.fftAccurate : fft_fast_1.fftFast;
+    const phasors = alg(ints);
+    const magnitudes = (0, mag_1.fftMag)(phasors).map((p) => p);
+    return (0, smoothing_1.smoothen)(magnitudes).map((m) => m / (sampleSize / 2) / maxInt);
+};
+exports.getVisualization = getVisualization;