web/src/decrypt/util.js

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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 AudioMimeType = {
mp3: "audio/mpeg",
flac: "audio/flac",
m4a: "audio/mp4",
ogg: "audio/ogg"
};
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// Also a new draft API: blob.arrayBuffer()
export async function GetArrayBuffer(blobObject) {
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return await new Promise(resolve => {
const reader = new FileReader();
reader.onload = (e) => {
resolve(e.target.result);
};
reader.readAsArrayBuffer(blobObject);
});
}
export function GetFileInfo(artist, title, filenameNoExt) {
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let newArtist = "", newTitle = "";
let filenameArray = filenameNoExt.split("-");
if (filenameArray.length > 1) {
newArtist = filenameArray[0].trim();
newTitle = filenameArray[1].trim();
} else if (filenameArray.length === 1) {
newTitle = filenameArray[0].trim();
}
if (typeof artist == "string" && artist !== "") newArtist = artist;
if (typeof title == "string" && title !== "") newTitle = title;
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return {artist: newArtist, title: newTitle};
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}
/**
* @return {string}
*/
export function GetCoverURL(metadata) {
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let pic_url = "";
if (metadata.common.picture !== undefined && metadata.common.picture.length > 0) {
let pic = new Blob([metadata.common.picture[0].data], {type: metadata.common.picture[0].format});
pic_url = URL.createObjectURL(pic);
}
return pic_url;
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}
export function IsBytesEqual(first, second) {
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// if want wholly check, should length first>=second
return first.every((val, idx) => {
return val === second[idx];
})
}
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/**
* @return {string}
*/
export function DetectAudioExt(data, fallbackExt) {
if (IsBytesEqual(MP3_HEADER, data.slice(0, MP3_HEADER.length))) return "mp3";
if (IsBytesEqual(FLAC_HEADER, data.slice(0, FLAC_HEADER.length))) return "flac";
if (IsBytesEqual(OGG_HEADER, data.slice(0, OGG_HEADER.length))) return "ogg";
if (IsBytesEqual(M4A_HEADER, data.slice(4, 8))) return "m4a";
return fallbackExt;
}