av/cmd/audio-player/main.js

/*
NAME
  main.js

AUTHOR
  Trek Hopton <trek@ausocean.org>
  Alan Noble <alan@ausocean.org>

LICENSE
  This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  for more details.

  You should have received a copy of the GNU General Public License in gpl.txt.
  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/

function processData() {
	const input = event.target.files[0]
	const reader = new FileReader()

	reader.onload = event => {
		bytes = new Uint8Array(event.target.result)

		// decode adpcm to pcm
		var decoded = decode(Array.from(bytes))

		// convert raw pcm to wav
		var wav = pcmToWav(decoded, 48000, 1, 16);

		// play wav data in player
		const blob = new Blob([Uint8Array.from(wav)], {
			type: 'audio/wav'
		});
		const url = URL.createObjectURL(blob);

		const audio = document.getElementById('audio');
		const source = document.getElementById('source');

		source.src = url;
		audio.load();
		audio.play();
	}
	reader.onerror = error => reject(error)
	reader.readAsArrayBuffer(input)

}

// getQuery gets everything after the question mark in the URL.
function getQuery() {
	var regex = new RegExp("\\?(.*)");
	var match = regex.exec(window.location.href);
	if (match == null) {
		return '';
	} else {
		return decodeURIComponent(match[1].replace(/\+/g, " "));
	}
}

function load() {
	var url = document.getElementById('url').value;
	if (url == "") {
		url = getQuery()
		document.getElementById('url').value = url;
	}
	if (url[0] == '/') {
		// url = window.location.protocol + '//' + window.location.host + url;
		url = "http://vidgrind.appspot.com" + url
	}
	if (url == "") {
		return;
	}

	var request = new XMLHttpRequest();
	request.responseType = "blob";
	request.onreadystatechange = function () {
		if (request.readyState === XMLHttpRequest.DONE) {
			if (request.status === 200) {
				console.log("request received");

				data = request.response;

				dataURL = URL.createObjectURL(data);

				var link = document.getElementById("link");
				link.href = dataURL;
				link.download = "audio.ts";
				link.innerHTML = "Download MPEG-TS";

			} else {
				console.log('There was a problem with the request.');
			}
		}
	}
	request.open("GET", url, true);
	request.send();
}