/**
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* Available window function types for audio processing
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*/
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export type WindowFunctionType = "hann" | "hamming" | "blackman" | "rectangular";
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/**
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* Applies a window function to a buffer of audio samples
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* @param buffer - The audio samples to apply the window function to
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* @param windowType - The type of window function to apply
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*/
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export function applyWindowFunction(buffer: Float32Array, windowType: WindowFunctionType = "hann"): void {
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const n = buffer.length;
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switch (windowType.toLowerCase()) {
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case "hann":
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for (let i = 0; i < n; i++) {
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buffer[i] *= 0.5 * (1 - Math.cos((2 * Math.PI * i) / (n - 1)));
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}
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break;
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case "hamming":
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for (let i = 0; i < n; i++) {
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buffer[i] *= 0.54 - 0.46 * Math.cos((2 * Math.PI * i) / (n - 1));
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}
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break;
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case "blackman":
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for (let i = 0; i < n; i++) {
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buffer[i] *= 0.42 - 0.5 * Math.cos((2 * Math.PI * i) / (n - 1)) + 0.08 * Math.cos((4 * Math.PI * i) / (n - 1));
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}
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break;
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case "rectangular":
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// No window function (rectangular)
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break;
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}
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}
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