51 lines
1.6 KiB
TypeScript
51 lines
1.6 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 { 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, _: string): Promise<DecryptResult> {
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const buffer = new Uint8Array(await GetArrayBuffer(file));
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let length = buffer.length;
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for (let i = 0; i < length; i++) {
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buffer[i] ^= 0xf4;
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if (buffer[i] <= 0x3f) buffer[i] = buffer[i] * 4;
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else if (buffer[i] <= 0x7f) buffer[i] = (buffer[i] - 0x40) * 4 + 1;
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else if (buffer[i] <= 0xbf) buffer[i] = (buffer[i] - 0x80) * 4 + 2;
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else buffer[i] = (buffer[i] - 0xc0) * 4 + 3;
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}
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let ext = SniffAudioExt(buffer, '');
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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([buffer], { type: AudioMimeType[ext] });
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} else if (newName.ext in HandlerMap) {
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audioBlob = new Blob([buffer], { 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, 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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