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] 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 { 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" return fallback_ext; } export function GetArrayBuffer(obj: Blob): Promise { 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 }