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usm.ts
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usm.ts
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class CRID {
_vm1: Uint8Array; // _video_vm11
_vm2: Uint8Array; // _video_vm12
_am: Uint8Array; // _audioMask
video: Uint8Array = new Uint8Array();
audio: Uint8Array = new Uint8Array();
strings: string[] = [];
private constString: Set<string> = new Set(["", "<NULL>", "fmtver", "filename", "filesize", "datasize", "stmid", "chno", "minchk", "minbuf", "avbps", "CRIUSF_DIR_STREAM"]);
parseKey (key:any) {
let buff = new Uint8Array(4);
try { switch (typeof key) {
case "string":
key = parseInt(key) || parseInt("0x" + key);
case 'number':
buff[0] = key & 0xff;
buff[1] = key >> 8 & 0xff;
buff[2] = key >> 16 & 0xff;
buff[3] = key >> 24 & 0xff;
break;
case 'object':
if (key instanceof Uint8Array) return key;
} } catch {
// key parse error
} finally {
return buff;
}
}
constructor (key1:any = null, key2:any = 0) {
this._vm1 = new Uint8Array(0x20);
this._vm2 = new Uint8Array(0x20);
this._am = new Uint8Array(0x20);
if (key1 === null) {
key1 = this.parseKey(0x43484A86);
key2 = this.parseKey(0x00000001);
} else if (typeof key1 === 'number') {
key1 = this.parseKey(key1);
key2 = this.parseKey(key2 ? key2 : key1 >> 32);
} else if (typeof key1 === 'string') {
key1 = parseInt(key1) || parseInt("0x" + key1);;
key1 = this.parseKey(key1);
key2 = this.parseKey(key2 ? key2 : key1 >> 32);
} else {
key1 = this.parseKey(key1);
key2 = this.parseKey(key2);
}
this.initMask(key1, key2);
}
initMask (key1:Uint8Array, key2:Uint8Array) {
this._vm1[0x00] = key1[0];
this._vm1[0x01] = key1[1];
this._vm1[0x02] = key1[2];
this._vm1[0x03] = key1[3] - 0x34;
this._vm1[0x04] = key2[0] + 0xF9;
this._vm1[0x05] = key2[1] ^ 0x13;
this._vm1[0x06] = key2[2] + 0x61;
this._vm1[0x07] = this._vm1[0x00] ^ 0xFF;
this._vm1[0x08] = this._vm1[0x02] + this._vm1[0x01];
this._vm1[0x09] = this._vm1[0x01] - this._vm1[0x07];
this._vm1[0x0A] = this._vm1[0x02] ^ 0xFF;
this._vm1[0x0B] = this._vm1[0x01] ^ 0xFF;
this._vm1[0x0C] = this._vm1[0x0B] + this._vm1[0x09];
this._vm1[0x0D] = this._vm1[0x08] - this._vm1[0x03];
this._vm1[0x0E] = this._vm1[0x0D] ^ 0xFF;
this._vm1[0x0F] = this._vm1[0x0A] - this._vm1[0x0B];
this._vm1[0x10] = this._vm1[0x08] - this._vm1[0x0F];
this._vm1[0x11] = this._vm1[0x10] ^ this._vm1[0x07];
this._vm1[0x12] = this._vm1[0x0F] ^ 0xFF;
this._vm1[0x13] = this._vm1[0x03] ^ 0x10;
this._vm1[0x14] = this._vm1[0x04] - 0x32;
this._vm1[0x15] = this._vm1[0x05] + 0xED;
this._vm1[0x16] = this._vm1[0x06] ^ 0xF3;
this._vm1[0x17] = this._vm1[0x13] - this._vm1[0x0F];
this._vm1[0x18] = this._vm1[0x15] + this._vm1[0x07];
this._vm1[0x19] = 0x21 - this._vm1[0x13];
this._vm1[0x1A] = this._vm1[0x14] ^ this._vm1[0x17];
this._vm1[0x1B] = this._vm1[0x16] + this._vm1[0x16];
this._vm1[0x1C] = this._vm1[0x17] + 0x44;
this._vm1[0x1D] = this._vm1[0x03] + this._vm1[0x04];
this._vm1[0x1E] = this._vm1[0x05] - this._vm1[0x16];
this._vm1[0x1F] = this._vm1[0x1D] ^ this._vm1[0x13];
const t2 = 'URUC';
for(let i = 0; i < 0x20; i++) {
this._vm2[i] = this._vm1[i] ^ 0xFF;
this._am[i] = (i & 1) ? t2[(i >> 1) & 3].charCodeAt(0) : this._vm2[i];
}
}
parseString(data: ArrayBuffer, len: number) {
const fp = new DataView(data, 0, len);
const sign = fp.getUint32(0, true);
const size = fp.getUint32(4);
const valueOffset = fp.getUint32(8);
const stringOffset = fp.getUint32(12);
const dataOffset = fp.getUint32(16);
const nameOffset = fp.getUint32(20);
const elementCount = fp.getUint16(24);
const valueSize = fp.getUint16(26);
const valueCount = fp.getUint32(28);
const _sl = dataOffset - stringOffset;
const p = new Uint8Array(data, 8 + stringOffset, _sl);
let jisdecoder = new TextDecoder('shift-jis');
let i = 0;
let j = 0;
while (i < _sl) {
while (p[i]) ++i;
let s = jisdecoder.decode(p.slice(j, i))
j = ++i;
if (this.constString.has(s)) continue;
this.strings.push(s);
}
}
parseTrunk(data: ArrayBuffer, async = false) {
let ftell = 0;
let v_trunks:Uint8Array[] = [];
let a_trunks:Uint8Array[] = [];
let v_trunks_a:Promise<Uint8Array>[] = [];
let a_trunks_a:Promise<Uint8Array>[] = [];
let v_size = 0;
let a_size = 0;
this.strings = [];
while (ftell < data.byteLength) {
const fp = new DataView(data, ftell, 32);
const magic = fp.getUint32(0, true);
const len = fp.getUint32(4);
const off = fp.getUint16(8);
const pad = fp.getUint16(10);
const type = fp.getUint32(12);
const frameTime = fp.getUint32(16);
const frameRate = fp.getUint32(20);
let p:Uint8Array;
switch (magic) {
case 0x44495243: // CRID
this.parseString(data.slice(ftell + off + 8), len - off - pad);
break;
case 0x56465340: // @SFV
if (type) break;
p = new Uint8Array(data, ftell + off + 8, len - off - pad);
v_size += p.byteLength;
if (async) v_trunks_a.push(this.maskVideoAsync(p));
else v_trunks.push(this.maskVideo(p))
break;
case 0x41465340: // @SFA
if (type) break;
p = new Uint8Array(data, ftell + off + 8, len - off - pad);
a_size += p.byteLength;
if (async) a_trunks_a.push(this.maskAudioAsync(p));
else a_trunks.push(this.maskAudio(p))
break;
default: // @CUE ...
}
ftell += len + 8;
}
return { v_trunks, v_trunks_a, v_size, a_trunks, a_trunks_a, a_size }
}
async demuxAsync(data: ArrayBuffer) {
let result = this.parseTrunk(data, true)
this.video = new Uint8Array(result.v_size);
this.audio = new Uint8Array(result.a_size);
await Promise.all([
this.concatAsync(result.v_trunks_a, this.video),
this.concatAsync(result.a_trunks_a, this.audio)
])
return {
video: this.video,
audio: this.audio
}
}
demux(data: ArrayBuffer) {
let result = this.parseTrunk(data)
this.video = new Uint8Array(result.v_size);
this.audio = new Uint8Array(result.a_size);
this.concat(result.v_trunks, this.video);
this.concat(result.a_trunks, this.audio);
return {
video: this.video,
audio: this.audio
}
}
maskVideo(p:Uint8Array) {
if (p.byteLength >= 0x240) {
let mask = new Uint8Array(this._vm2);
for (let j = 0x140; j < p.byteLength; j++) mask[j & 0x1f] = (p[j] ^= mask[j & 0x1f]) ^ this._vm2[j & 0x1f];
mask = new Uint8Array(this._vm1);
for (let j = 0x40; j < 0x140; j++) p[j] ^= mask[j & 0x1f] ^= p[j + 0x100];
}
return p;
}
async maskVideoAsync(p:Uint8Array) { return this.maskVideo(p); }
maskAudio(p:Uint8Array) {
for (let j = 0x140; j < p.byteLength; j++) p[j] ^= this._am[j & 0x1f];
return p;
}
async maskAudioAsync(p:Uint8Array) { return this.maskAudio(p); }
private async concatAsync(trunks: Promise<Uint8Array>[], dist: Uint8Array) {
let offset = 0;
for (let i of trunks) {
let buff = await i;
dist.set(buff, offset);
offset += buff.byteLength;
}
return dist;
}
private concat(trunks: Uint8Array[], dist: Uint8Array) {
let offset = 0;
for (let i of trunks) {
let buff = i;
dist.set(buff, offset);
offset += buff.byteLength;
}
return dist;
}
}