61 lines
2.0 KiB
TypeScript
61 lines
2.0 KiB
TypeScript
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 WMA_HEADER = [
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0x30, 0x26, 0xB2, 0x75, 0x8E, 0x66, 0xCF, 0x11,
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0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C,
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]
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export const WAV_HEADER = [0x52, 0x49, 0x46, 0x46]
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export const AAC_HEADER = [0xFF, 0xF1]
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export const AudioMimeType: { [key: string]: string } = {
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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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wma: "audio/x-ms-wma",
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wav: "audio/x-wav"
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};
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export function BytesHasPrefix(data: Uint8Array, prefix: number[]): boolean {
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if (prefix.length > data.length) return false
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return prefix.every((val, idx) => {
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return val === data[idx];
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})
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}
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export function BytesEquals(data: Uint8Array, another: Uint8Array): boolean {
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if (another.length != data.length) return false
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return data.every((val, idx) => {
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return val === another[idx];
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})
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}
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export function SniffAudioExt(data: Uint8Array, fallback_ext: string = "mp3"): string {
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if (BytesHasPrefix(data, MP3_HEADER)) return "mp3"
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if (BytesHasPrefix(data, FLAC_HEADER)) return "flac"
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if (BytesHasPrefix(data, OGG_HEADER)) return "ogg"
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if (data.length >= 4 + M4A_HEADER.length &&
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BytesHasPrefix(data.slice(4), M4A_HEADER)) return "m4a"
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if (BytesHasPrefix(data, WAV_HEADER)) return "wav"
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if (BytesHasPrefix(data, WMA_HEADER)) return "wma"
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if (BytesHasPrefix(data, AAC_HEADER)) return "aac"
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return fallback_ext;
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}
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export function GetArrayBuffer(obj: Blob): Promise<ArrayBuffer> {
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if (!!obj.arrayBuffer) return obj.arrayBuffer()
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onload = (e) => {
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const rs = e.target?.result
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if (!rs) {
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reject("read file failed")
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} else {
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resolve(rs as ArrayBuffer)
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}
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};
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reader.readAsArrayBuffer(obj);
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});
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}
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