web/src/decrypt/utils.ts

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import { IAudioMetadata } from 'music-metadata-browser';
import ID3Writer from 'browser-id3-writer';
import MetaFlac from 'metaflac-js';
export const FLAC_HEADER = [0x66, 0x4c, 0x61, 0x43];
export const MP3_HEADER = [0x49, 0x44, 0x33];
export const OGG_HEADER = [0x4f, 0x67, 0x67, 0x53];
export const M4A_HEADER = [0x66, 0x74, 0x79, 0x70];
//prettier-ignore
export const WMA_HEADER = [
0x30, 0x26, 0xb2, 0x75, 0x8e, 0x66, 0xcf, 0x11,
0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c,
];
export const WAV_HEADER = [0x52, 0x49, 0x46, 0x46];
export const AAC_HEADER = [0xff, 0xf1];
export const DFF_HEADER = [0x46, 0x52, 0x4d, 0x38];
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export const AudioMimeType: { [key: string]: string } = {
mp3: 'audio/mpeg',
flac: 'audio/flac',
m4a: 'audio/mp4',
ogg: 'audio/ogg',
wma: 'audio/x-ms-wma',
wav: 'audio/x-wav',
dff: 'audio/x-dff',
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};
export function BytesHasPrefix(data: Uint8Array, prefix: number[]): boolean {
if (prefix.length > data.length) return false;
return prefix.every((val, idx) => {
return val === data[idx];
});
}
export function BytesEqual(a: Uint8Array, b: Uint8Array): boolean {
if (a.length !== b.length) return false;
return a.every((val, idx) => {
return val === b[idx];
});
}
export function SniffAudioExt(data: Uint8Array, fallback_ext: string = 'mp3'): string {
if (BytesHasPrefix(data, MP3_HEADER)) return 'mp3';
if (BytesHasPrefix(data, FLAC_HEADER)) return 'flac';
if (BytesHasPrefix(data, OGG_HEADER)) return 'ogg';
if (data.length >= 4 + M4A_HEADER.length && BytesHasPrefix(data.slice(4), M4A_HEADER)) return 'm4a';
if (BytesHasPrefix(data, WAV_HEADER)) return 'wav';
if (BytesHasPrefix(data, WMA_HEADER)) return 'wma';
if (BytesHasPrefix(data, AAC_HEADER)) return 'aac';
if (BytesHasPrefix(data, DFF_HEADER)) return 'dff';
return fallback_ext;
}
export function GetArrayBuffer(obj: Blob): Promise<ArrayBuffer> {
if (!!obj.arrayBuffer) return obj.arrayBuffer();
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = (e) => {
const rs = e.target?.result;
if (!rs) {
reject('read file failed');
} else {
resolve(rs as ArrayBuffer);
}
};
reader.readAsArrayBuffer(obj);
});
}
export function GetCoverFromFile(metadata: IAudioMetadata): string {
if (metadata.common?.picture && metadata.common.picture.length > 0) {
return URL.createObjectURL(
new Blob([metadata.common.picture[0].data], { type: metadata.common.picture[0].format }),
);
}
return '';
}
export interface IMusicMetaBasic {
title: string;
artist?: string;
}
export function GetMetaFromFile(
filename: string,
exist_title?: string,
exist_artist?: string,
separator = '-',
): IMusicMetaBasic {
const meta: IMusicMetaBasic = { title: exist_title ?? '', artist: exist_artist };
const items = filename.split(separator);
if (items.length > 1) {
if (!meta.artist) meta.artist = items[0].trim();
if (!meta.title) meta.title = items[1].trim();
} else if (items.length === 1) {
if (!meta.title) meta.title = items[0].trim();
}
return meta;
}
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export async function GetImageFromURL(
src: string,
): Promise<{ mime: string; buffer: ArrayBuffer; url: string } | undefined> {
try {
const resp = await fetch(src);
const mime = resp.headers.get('Content-Type');
if (mime?.startsWith('image/')) {
const buffer = await resp.arrayBuffer();
const url = URL.createObjectURL(new Blob([buffer], { type: mime }));
return { buffer, url, mime };
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}
} catch (e) {
console.warn(e);
}
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}
export interface IMusicMeta {
title: string;
artists?: string[];
album?: string;
picture?: ArrayBuffer;
picture_desc?: string;
}
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export function WriteMetaToMp3(audioData: Buffer, info: IMusicMeta, original: IAudioMetadata) {
const writer = new ID3Writer(audioData);
// reserve original data
const frames = original.native['ID3v2.4'] || original.native['ID3v2.3'] || original.native['ID3v2.2'] || [];
frames.forEach((frame) => {
if (frame.id !== 'TPE1' && frame.id !== 'TIT2' && frame.id !== 'TALB') {
try {
writer.setFrame(frame.id, frame.value);
} catch (e) {}
}
});
const old = original.common;
writer
.setFrame('TPE1', old?.artists || info.artists || [])
.setFrame('TIT2', old?.title || info.title)
.setFrame('TALB', old?.album || info.album || '');
if (info.picture) {
writer.setFrame('APIC', {
type: 3,
data: info.picture,
description: info.picture_desc || '',
});
}
return writer.addTag();
}
export function WriteMetaToFlac(audioData: Buffer, info: IMusicMeta, original: IAudioMetadata) {
const writer = new MetaFlac(audioData);
const old = original.common;
if (!old.title && !old.album && old.artists) {
writer.setTag('TITLE=' + info.title);
writer.setTag('ALBUM=' + info.album);
if (info.artists) {
writer.removeTag('ARTIST');
info.artists.forEach((artist) => writer.setTag('ARTIST=' + artist));
}
}
if (info.picture) {
writer.importPictureFromBuffer(Buffer.from(info.picture));
}
return writer.save();
}
export function SplitFilename(n: string): { name: string; ext: string } {
const pos = n.lastIndexOf('.');
return {
ext: n.substring(pos + 1).toLowerCase(),
name: n.substring(0, pos),
};
}