68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
import {
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AudioMimeType,
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GetArrayBuffer,
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GetCoverFromFile,
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GetMetaFromFile,
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SniffAudioExt,
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SplitFilename,
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} from '@/decrypt/utils';
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import { Decrypt as QmcDecrypt, HandlerMap } from '@/decrypt/qmc';
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import { DecryptQmcWasm } from '@/decrypt/qmc_wasm';
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import { DecryptResult } from '@/decrypt/entity';
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import { parseBlob as metaParseBlob } from 'music-metadata-browser';
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export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string): Promise<DecryptResult> {
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const buffer = await GetArrayBuffer(file);
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let musicDecoded: Uint8Array | undefined;
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if (globalThis.WebAssembly) {
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console.log('qmc: using wasm decoder');
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const qmcDecrypted = await DecryptQmcWasm(buffer, raw_ext);
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// 若 wasm 失败，使用 js 再尝试一次
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if (qmcDecrypted.success) {
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musicDecoded = qmcDecrypted.data;
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console.log('qmc wasm decoder suceeded');
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} else {
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console.warn('QmcWasm failed with error %s', qmcDecrypted.error || '(unknown error)');
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}
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}
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if (!musicDecoded) {
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musicDecoded = new Uint8Array(buffer);
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let length = musicDecoded.length;
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for (let i = 0; i < length; i++) {
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let byte = musicDecoded[i] ^ 0xf4; // xor 0xf4
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byte = ((byte & 0b0011_1111) << 2) | (byte >> 6); // rol 2
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musicDecoded[i] = byte;
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}
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}
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let ext = SniffAudioExt(musicDecoded, '');
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const newName = SplitFilename(raw_filename);
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let audioBlob: Blob;
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if (ext !== '' || newName.ext === 'mp3') {
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audioBlob = new Blob([musicDecoded], { type: AudioMimeType[ext] });
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} else if (newName.ext in HandlerMap) {
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audioBlob = new Blob([musicDecoded], { type: 'application/octet-stream' });
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return QmcDecrypt(audioBlob, newName.name, newName.ext);
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} else {
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throw '不支持的QQ音乐缓存格式';
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}
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const tag = await metaParseBlob(audioBlob);
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const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, String(tag.common.artists || tag.common.artist || ""));
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return {
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title,
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artist,
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ext,
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album: tag.common.album,
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picture: GetCoverFromFile(tag),
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file: URL.createObjectURL(audioBlob),
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blob: audioBlob,
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mime: AudioMimeType[ext],
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};
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}
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