mirror of
https://github.com/OpenSquawk/OpenSquawk
synced 2026-08-01 14:16:05 +08:00
29 lines
960 B
TypeScript
29 lines
960 B
TypeScript
export const encodeWav = (pcm: Float32Array, sampleRate: number): Blob => {
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const length = pcm.length
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const buffer = new ArrayBuffer(44 + length * 2)
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const view = new DataView(buffer)
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const writeStr = (off: number, s: string) => {
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for (let i = 0; i < s.length; i++) view.setUint8(off + i, s.charCodeAt(i))
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}
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writeStr(0, 'RIFF')
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view.setUint32(4, 36 + length * 2, true)
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writeStr(8, 'WAVE')
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writeStr(12, 'fmt ')
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view.setUint32(16, 16, true)
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view.setUint16(20, 1, true)
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view.setUint16(22, 1, true)
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view.setUint32(24, sampleRate, true)
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view.setUint32(28, sampleRate * 2, true)
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view.setUint16(32, 2, true)
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view.setUint16(34, 16, true)
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writeStr(36, 'data')
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view.setUint32(40, length * 2, true)
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let off = 44
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for (let i = 0; i < length; i++) {
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const s = Math.max(-1, Math.min(1, pcm[i]))
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view.setInt16(off, s < 0 ? s * 0x8000 : s * 0x7FFF, true)
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off += 2
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}
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return new Blob([buffer], { type: 'audio/wav' })
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}
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