web/src/decrypt/raw.ts

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import { AudioMimeType, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile, SniffAudioExt } from '@/decrypt/utils';
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,
detect: boolean = true,
): Promise<DecryptResult> {
let ext = raw_ext;
if (detect) {
const buffer = new Uint8Array(await GetArrayBuffer(file));
ext = SniffAudioExt(buffer, raw_ext);
if (ext !== raw_ext) file = new Blob([buffer], { type: AudioMimeType[ext] });
}
const tag = await metaParseBlob(file);
const { title, artist } = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist);
return {
title,
artist,
ext,
album: tag.common.album,
picture: GetCoverFromFile(tag),
file: URL.createObjectURL(file),
blob: file,
mime: AudioMimeType[ext],
};
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}