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).
*/

window.onload = function () {
	document.getElementById('fileinput').addEventListener('change', processData);
}

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)

}

function sync(dateID, tsID, dateChanged) {
	if (dateChanged) { // Go from date to Unix timestamp.
		var s = document.getElementById(dateID).value;
		if (s == "") {
			document.getElementById(tsID).value = "";
		} else {
			if (s.length == 16) {
				s += ':00'; // Append seconds.
			}
			s += 'Z';
			var dt = new Date(s)
			document.getElementById(tsID).value = (dt.getTime() / 1000).toString();
		}
	} else { // Go from Unix timestamp to local date.
		var s = document.getElementById(dateID).value;
		if (s == "") {
			document.getElementById(tsID).value = "";
		} else {
			var ts = parseInt(document.getElementById(tsID).value) * 1000;
			var dt = new Date(ts).toISOString().slice(0, -1);
			document.getElementById(dateID).value = dt;
		}
	}
}

function presubmit() {
	if (document.getElementById('st').value == "" && document.getElementById('sd').value != "") {
		sync('sd', 'st', true);
	}
	if (document.getElementById('ft').value == "" && document.getElementById('fd').value != "") {
		sync('fd', 'ft', true);
	}
	if (document.getElementById('ft').value == "") {
		document.getElementById('ts').value = document.getElementById('st').value;
	} else {
		document.getElementById('ts').value = document.getElementById('st').value + '-' + document
			.getElementById('ft').value;
	}
}

// encodeMAC encodes a MAC address into a 48-bit integer.
function encodeMAC(mac) {
	if (mac.length != 17) {
		return 0;
	}
	var enc = BigInt(0);
	for (i = 15, shift = 0; i >= 0; i -= 3, shift += 8) {
		var n = BigInt(parseInt(mac.substring(i, i + 2), 16));
		enc += (n << BigInt(shift));
	}
	return enc;
}

// encodePin encodes a pin into a 4-bit integer.
function encodePin(pin) {
	var enc = Number(0);
	if (pin.charAt(0) == 'S') {
		enc = 8;
	}
	var pn = Number(pin.charAt(1) - '0');
	if (pin.length > 2) {
		pn = pn * 10 + Number(pin.CharAt(2) - '0');
	}
	enc |= pn;
	return enc;
}

// toMID returns a Media ID as a BigInt given a MAC address and a pin.
function toMID(mac, pin) {
	if (mac == "" || pin == "") {
		return 0;
	}
	return (encodeMAC(mac) << BigInt(4)) | BigInt(encodePin(pin))
}

// updateMID updates a Media ID element using values from MAC and pin elements.
function updateMID(mac, pin, mid) {
	var macElem = document.getElementById(mac);
	var pinElem = document.getElementById(pin);
	var midElem = document.getElementById(mid);
	if (!macElem || !pinElem || !midElem) {
		return;
	}
	midElem.value = toMID(macElem.value, pinElem.value).toString();
}