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