feat: export MP4 parser (#189)

* feat: export MP4 parser

* chore(type): change to MP4Parser

src/index.d.ts

@@ -10,3 +10,4 @@
  * governing permissions and limitations under the License.
  */
 export * from './MediaHandler';
+export * from './mp4/Parser';

src/index.js

@@ -10,8 +10,9 @@
  * governing permissions and limitations under the License.
  */
 import MediaHandler from './MediaHandler.js';
+import { Parser as MP4Parser } from './mp4/Parser.js';
 
 export {
-  // eslint-disable-next-line import/prefer-default-export
   MediaHandler,
+  MP4Parser,
 };

src/mp4/Parser.d.ts

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2021 Adobe. All rights reserved.
+ * This file is licensed to you under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License. You may obtain a copy
+ * of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+
+/**
+ * Default Resource Meta
+ */
+export declare interface MP4Info {
+  /**
+   * Width
+   */
+  width: number;
+
+  /**
+   * Height
+   */
+  height: number;
+
+  /**
+   * Duration in seconds
+   */
+  duration?: number;
+}
+
+/**
+ * MP4 parser that will return information about width, height and duration.
+ */
+export declare class MP4Parser {
+  /**
+   * Creates a new MP4 parser
+   *
+   * @param {Buffer} buf buffer
+   * @param {any} log logger
+   * @param {name} name of MP4 being parsed
+   * @throws Error If the options are invalid.
+   */
+  constructor(buf: Buffer, log: any, name?: string);
+
+  /**
+   * Probe the buffer whether it is a valid MP4
+   *
+   * @returns true if the MP4 is valid, false otherwise
+   */
+  probe(): boolean;
+
+  /**
+   * Parse the buffer and return information
+   */
+  parse(): MP4Info;
+}