47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
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#!/usr/bin/env node
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const fs = require("fs")
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const rsf = fs.readFileSync(process.argv[2])
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const fmt = rsf.readInt16BE(0) // 0x0100
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if (fmt != 0x0100) {
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throw new Error("Invalid input format: " + fmt)
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}
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const size = rsf.readInt16BE(2)
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const samplerate = rsf.readInt16BE(4)
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const repeat = rsf.readInt16BE(6)
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const datasize = rsf.length - 8
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const wavHd = new Buffer(44)
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function writeMark(off, mark) {
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for (let i = 0; i < mark.length; ++i) {
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wavHd[off + i] = mark.charCodeAt(i)
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}
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}
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writeMark(0, 'RIFF')
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wavHd.writeInt32LE(datasize + 36, 4)
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writeMark(8, 'WAVE')
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writeMark(12, 'fmt ')
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wavHd.writeInt32LE(16, 16) // fmt size
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wavHd.writeInt16LE(1, 20) // PCM
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wavHd.writeInt16LE(1, 22) // mono, 1ch
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wavHd.writeInt32LE(samplerate, 24)
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wavHd.writeInt32LE(samplerate, 28) // byterate
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wavHd.writeInt16LE(1, 32) // block align
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wavHd.writeInt16LE(8, 34) // bits per sample
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writeMark(36, 'data')
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wavHd.writeInt32LE(datasize, 40)
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const wav = Buffer.concat([wavHd, rsf.slice(8)])
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console.log("writing out.wav")
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fs.writeFileSync("out.wav", wav)
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if (require("os").platform() == "darwin")
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require('child_process').execSync("afplay out.wav")
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// TODO also play on Windows
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