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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
// Adapted from https://www.npmjs.com/package/audiobuffer-to-wav
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export function encodeWAV(samples) {
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let offset = 44;
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const buffer = new ArrayBuffer(offset + samples.length * 4);
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const view = new DataView(buffer);
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const sampleRate = 16000;
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/* RIFF identifier */
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writeString(view, 0, 'RIFF')
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/* RIFF chunk length */
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view.setUint32(4, 36 + samples.length * 4, true)
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/* RIFF type */
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writeString(view, 8, 'WAVE')
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/* format chunk identifier */
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writeString(view, 12, 'fmt ')
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/* format chunk length */
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view.setUint32(16, 16, true)
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/* sample format (raw) */
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view.setUint16(20, 3, true)
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/* channel count */
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view.setUint16(22, 1, true)
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/* sample rate */
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view.setUint32(24, sampleRate, true)
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/* byte rate (sample rate * block align) */
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view.setUint32(28, sampleRate * 4, true)
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/* block align (channel count * bytes per sample) */
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view.setUint16(32, 4, true)
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/* bits per sample */
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view.setUint16(34, 32, true)
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/* data chunk identifier */
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writeString(view, 36, 'data')
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/* data chunk length */
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view.setUint32(40, samples.length * 4, true)
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for (let i = 0; i < samples.length; ++i, offset += 4) {
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view.setFloat32(offset, samples[i], true)
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}
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return buffer
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}
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function writeString(view, offset, string) {
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for (let i = 0; i < string.length; ++i) {
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view.setUint8(offset + i, string.charCodeAt(i))
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}
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} |