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forked from um/web
web/src/decrypt/utils.ts

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TypeScript
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import {IAudioMetadata} from "music-metadata-browser";
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];
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]
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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"
};
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 BytesEquals(data: Uint8Array, another: Uint8Array): boolean {
if (another.length != data.length) return false
return data.every((val, idx) => {
return val === another[idx];
})
}
export function SniffAudioExt(data: Uint8Array, fallback_ext: string = "mp3"): string {
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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 &&
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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"
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
}