67 lines
2.1 KiB
JavaScript
67 lines
2.1 KiB
JavaScript
export const FLAC_HEADER = [0x66, 0x4C, 0x61, 0x43];
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export const MP3_HEADER = [0x49, 0x44, 0x33];
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export const OGG_HEADER = [0x4F, 0x67, 0x67, 0x53];
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export const M4A_HEADER = [0x66, 0x74, 0x79, 0x70];
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export const AudioMimeType = {
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mp3: "audio/mpeg",
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flac: "audio/flac",
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m4a: "audio/mp4",
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ogg: "audio/ogg"
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};
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// Also a new draft API: blob.arrayBuffer()
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export async function GetArrayBuffer(blobObject) {
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return await new Promise(resolve => {
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const reader = new FileReader();
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reader.onload = (e) => {
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resolve(e.target.result);
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};
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reader.readAsArrayBuffer(blobObject);
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});
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}
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export function GetFileInfo(artist, title, filenameNoExt) {
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let newArtist = "", newTitle = "";
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let filenameArray = filenameNoExt.split("-");
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if (filenameArray.length > 1) {
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newArtist = filenameArray[0].trim();
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newTitle = filenameArray[1].trim();
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} else if (filenameArray.length === 1) {
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newTitle = filenameArray[0].trim();
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}
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if (typeof artist == "string" && artist !== "") newArtist = artist;
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if (typeof title == "string" && title !== "") newTitle = title;
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return {artist: newArtist, title: newTitle};
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}
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/**
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* @return {string}
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*/
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export function GetCoverURL(metadata) {
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let pic_url = "";
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if (metadata.common.picture !== undefined && metadata.common.picture.length > 0) {
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let pic = new Blob([metadata.common.picture[0].data], {type: metadata.common.picture[0].format});
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pic_url = URL.createObjectURL(pic);
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}
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return pic_url;
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}
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export function IsBytesEqual(first, second) {
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// if want wholly check, should length first>=second
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return first.every((val, idx) => {
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return val === second[idx];
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})
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}
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/**
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* @return {string}
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*/
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export function DetectAudioExt(data, fallbackExt) {
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if (IsBytesEqual(MP3_HEADER, data.slice(0, MP3_HEADER.length))) return "mp3";
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if (IsBytesEqual(FLAC_HEADER, data.slice(0, FLAC_HEADER.length))) return "flac";
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if (IsBytesEqual(OGG_HEADER, data.slice(0, OGG_HEADER.length))) return "ogg";
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if (IsBytesEqual(M4A_HEADER, data.slice(4, 8))) return "m4a";
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return fallbackExt;
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}
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