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