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fanfare/gist:0fa525af28b275fd6623942d7e9d70dd

Created November 22, 2020 08:17
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mp3 inside mp4 via javascript
Raw
gistfile1.txt
// input MUST be 128kbps cbr mp3 with no album art (and probably no id3, untested)
const encapsulatemp3insidemp4 = (function() {
// firefox mediasource extensions support
// encapsulate cbr 128 kbps mp3 inside audio/mp4
// jollo.org 0BSD or LNT
const encapsulation = (function() {
function bumpsum(prev, pad, inc) {
let hex = prev
hex = "0x" + hex
hex = parseInt(hex,16)
hex = hex + inc
hex = hex.toString(16)
return pad.substring(0, pad.length - hex.length) + hex
}
const header = [
0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, 0x69, 0x73,
0x6F, 0x6D, 0x00, 0x00, 0x02, 0x00, 0x69, 0x73, 0x6F, 0x6D,
0x69, 0x73, 0x6F, 0x36, 0x69, 0x73, 0x6F, 0x32, 0x6D, 0x70,
0x34, 0x31, 0x00, 0x00, 0x02, 0x9F, 0x6D, 0x6F, 0x6F, 0x76,
0x00, 0x00, 0x00, 0x6C, 0x6D, 0x76, 0x68, 0x64, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x03, 0xE8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
0x01, 0xA1, 0x74, 0x72, 0x61, 0x6B, 0x00, 0x00, 0x00, 0x5C,
0x74, 0x6B, 0x68, 0x64, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x3D, 0x6D, 0x64, 0x69, 0x61, 0x00, 0x00, 0x00, 0x20,
0x6D, 0x64, 0x68, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAC, 0x44,
0x00, 0x00, 0x00, 0x00, 0x55, 0xC4, 0x00, 0x00, 0x00, 0x00,
0x00, 0x2D, 0x68, 0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x73, 0x6F, 0x75, 0x6E, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x53, 0x6F, 0x75, 0x6E, 0x64, 0x48, 0x61, 0x6E, 0x64, 0x6C,
0x65, 0x72, 0x00, 0x00, 0x00, 0x00, 0xE8, 0x6D, 0x69, 0x6E,
0x66, 0x00, 0x00, 0x00, 0x10, 0x73, 0x6D, 0x68, 0x64, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x24, 0x64, 0x69, 0x6E, 0x66, 0x00, 0x00, 0x00, 0x1C, 0x64,
0x72, 0x65, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x0C, 0x75, 0x72, 0x6C, 0x20, 0x00,
0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xAC, 0x73, 0x74, 0x62,
0x6C, 0x00, 0x00, 0x00, 0x60, 0x73, 0x74, 0x73, 0x64, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x50, 0x6D, 0x70, 0x34, 0x61, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x02, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0xAC,
0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2C, 0x65, 0x73, 0x64,
0x73, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80, 0x80, 0x80, 0x1B,
0x00, 0x01, 0x00, 0x04, 0x80, 0x80, 0x80, 0x0D, 0x6B, 0x15,
0x00, 0x00, 0x00, 0x00, 0x01, 0xF4, 0x00, 0x00, 0x00, 0x00,
0x00, 0x06, 0x80, 0x80, 0x80, 0x01, 0x02, 0x00, 0x00, 0x00,
0x10, 0x73, 0x74, 0x74, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x73, 0x74, 0x73,
0x63, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x14, 0x73, 0x74, 0x73, 0x7A, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x10, 0x73, 0x74, 0x63, 0x6F, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x6D,
0x76, 0x65, 0x78, 0x00, 0x00, 0x00, 0x20, 0x74, 0x72, 0x65,
0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x62, 0x75,
0x64, 0x74, 0x61, 0x00, 0x00, 0x00, 0x5A, 0x6D, 0x65, 0x74,
0x61, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x68,
0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x6D, 0x64, 0x69, 0x72, 0x61, 0x70, 0x70, 0x6C, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x2D, 0x69, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00, 0x25,
0xA9, 0x74, 0x6F, 0x6F, 0x00, 0x00, 0x00, 0x1D, 0x64, 0x61,
0x74, 0x61, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x4C, 0x61, 0x76, 0x66, 0x35, 0x38, 0x2E, 0x34, 0x38, 0x2E,
0x31, 0x30, 0x30
]
let s = []
let sendheader = true
let granularever = false
let granularpad = "000000000000"
let framepad = "00000000"
let sums = {
frame: "1",
granular: "0"
}
const tick = function(begseg, midseg, endseg) {
let info = [
0x00, 0x00, 0x01, 0x00, 0x6D, 0x6F, 0x6F, 0x66, 0x00, 0x00,
0x00, 0x10, 0x6D, 0x66, 0x68, 0x64, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0xE8, 0x74, 0x72,
0x61, 0x66, 0x00, 0x00, 0x00, 0x1C, 0x74, 0x66, 0x68, 0x64,
0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
0x04, 0x80, 0x00, 0x00, 0x01, 0xA2, 0x02, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x14, 0x74, 0x66, 0x64, 0x74, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAF, 0x80,
0x00, 0x00, 0x00, 0xB0, 0x74, 0x72, 0x75, 0x6E, 0x00, 0x00,
0x02, 0x01, 0x00, 0x00, 0x00, 0x27, 0x00, 0x00, 0x01, 0x08,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA1, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2,
0x00, 0x00, 0x01, 0xA1, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00,
0x01, 0xA2, 0x00, 0x00, 0x01, 0xA2, 0x00, 0x00, 0x3F, 0xB4,
0x6D, 0x64, 0x61, 0x74
]
let pxframe = ""
let pxgranular = ""
if (!granularever) {
granularever = true
pxframe = "00000001",
pxgranular = "000000000000"
}
else {
var granularbump = bumpsum(sums.granular, granularpad, 44928)
var framebump = bumpsum(sums.frame, framepad, 1)
var granularusable = granularbump
var frameusable = framebump
sums["granular"] = granularbump
sums["frame"] = framebump
pxframe = frameusable,
pxgranular = granularusable
}
for (let i=0,f=20;i<8;i+=2,f++) {
let sub = pxframe.slice(i,i+2)
info[f] = parseInt("0x"+sub, "hex")
}
info[55] = begseg
for (let i=0,f=74;i<12;i+=2,f++) {
let sub = pxgranular.slice(i,i+2)
info[f] = parseInt("0x"+sub, "hex")
}
for (let i=0,f=103;i<midseg.length;i++,f++) {
info[f] = midseg[i]
}
info[259] = endseg
return info
}
let segments = []
let pattern = ""
let sync = false
let segment = ""
const interlace = function(mp3bytearray) {
s.push(...mp3bytearray)
if (s.length < 2500) {
return null
}
let seekable = true
while (seekable) {
for (let i=0;i<s.length-900;i++) {
if (s[i] !== 0xFF || s[i+1] !== 0xFB
|| (s[i+2] !== 0x92 && s[i+2] !== 0x90)) {
continue
}
let es = s[i+2] === 0x92 ? 418 : 417
if (s[i+es] !== 0xFF || s[i+es+1] !== 0xFB
|| (s[i+es+2] !== 0x92 && s[i+es+2] !== 0x90)) {
continue
}
let ys = s[i+es+2] === 0x92 ? 418 : 417
if (s[i+es+ys] !== 0xFF || s[i+es+ys+1] !== 0xFB
|| (s[i+es+ys+2] !== 0x92 && s[i+es+ys+2] !== 0x90)) {
continue
}
sync = true
pattern += s[i+2] === 0x92 ? "-" : "x"
s.splice(0,i)
segment = s.splice(0,es)
segments.push(...segment)
break
}
if (!sync) {
s.splice(0,s.length-900)
}
if (pattern.length > 38 || s.length < 900) {
seekable = false
}
}
if (pattern.length > 38) {
let midseg = []
for (let j=0;j<pattern.length;j++) {
if (pattern[j] === "x") {
midseg.push(...[161,0,0,1])
}
else {
midseg.push(...[162,0,0,1])
}
}
midseg.pop()
let begseg = pattern.substring(0,1) === "x" ? 0xA1 : 0xA2
let endseg = 182 - (pattern.replace(/\-/g, "")).length
let response = []
if (sendheader) {
sendheader = false
response.push(...header)
}
let box = tick(begseg, midseg, endseg)
response.push(...box)
response.push(...segments)
sync = false
pattern = ""
segments = []
segment = ""
return response
}
else {
return null
}
}
return {
interlace
}
})()
return encapsulation.interlace
})();
// e.g.
// let mp4 = encapsulatemp3insidemp4(Uint8Array)
// if (mp4) {
// mp4 = Uint8Array.from(mp4)
// }
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