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removed audio-player files

This commit is contained in:
Trek H 2019-09-14 20:01:44 +09:30
parent c3df750175
commit 751ee29c79
5 changed files with 0 additions and 359 deletions
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147
cmd/audio-player/adpcm.js
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/*
NAME
adpcm.js
AUTHOR
Trek Hopton <trek@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).
*/
/*
Original IMA/DVI ADPCM specification: (http://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf).
Reference algorithms for ADPCM compression and decompression are in part 6.
*/
// Table of index changes (see spec).
const indexTable = [
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
];
// Quantize step size table (see spec).
const stepTable = [
7, 8, 9, 10, 11, 12, 13, 14,
16, 17, 19, 21, 23, 25, 28, 31,
34, 37, 41, 45, 50, 55, 60, 66,
73, 80, 88, 97, 107, 118, 130, 143,
157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 876, 963, 1060, 1166, 1282, 1411,
1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
32767
];
const byteDepth = 2, // We are working with 16-bit samples. TODO(Trek): make configurable.
headSize = 8, // Number of bytes in the header of ADPCM.
chunkLenSize = 4;
let est = 0, // Estimation of sample based on quantised ADPCM nibble.
idx = 0, // Index to step used for estimation.
step = 0;
// decodeSample takes 4 bits which represents a single ADPCM nibble, and returns a 16 bit decoded PCM sample.
function decodeSample(nibble) {
let diff = 0;
if ((nibble & 4) != 0) {
diff += step;
}
if ((nibble & 2) != 0) {
diff += step >> 1;
}
if ((nibble & 1) != 0) {
diff += step >> 2;
}
diff += step >> 3;
if ((nibble & 8) != 0) {
diff = -diff;
}
est += diff;
idx += indexTable[nibble];
if (idx < 0) {
idx = 0;
} else if (idx > stepTable.length - 1) {
idx = stepTable.length - 1;
}
step = stepTable[idx];
result = est;
return result;
}
// decode takes an array of bytes of arbitrary length representing adpcm and decodes it into pcm.
function decode(b) {
// Iterate over each chunk and decode it.
let chunkLen;
var result = [];
for (var off = 0; off + headSize <= b.length; off += chunkLen) {
// Read length of chunk and check if whole chunk exists.
chunkLen = bytesToInt32(b.slice(off, off + chunkLenSize))
if (off + chunkLen > b.length) {
break;
}
// Initialize Decoder with first 4 bytes of b.
est = bytesToInt16(b.slice(off + chunkLenSize, off + chunkLenSize + byteDepth));
idx = b[off + chunkLenSize + byteDepth];
step = stepTable[idx];
result.push(...b.slice(off + chunkLenSize, off + chunkLenSize + byteDepth));
for (var i = off + headSize; i < off + chunkLen - b[off + chunkLenSize + 3]; i++) {
var twoNibs = b[i];
var nib2 = twoNibs >> 4;
var nib1 = (nib2 << 4) ^ twoNibs;
var sample1 = int16ToBytes(decodeSample(nib1));
result.push(...sample1);
var sample2 = int16ToBytes(decodeSample(nib2));
result.push(...sample2);
}
if (b[off + chunkLenSize + 3] == 1) {
var padNib = b[off + chunkLen - 1];
var sample = int16ToBytes(decodeSample(padNib));
result.push(...sample);
}
}
return result;
}
// int16ToBytes takes a number assumed to be an int 16 and converts it to an array containing bytes (Little Endian).
function int16ToBytes(num) {
return [(num & 0x00ff), (num & 0xff00) >> 8];
}
// bytesToInt16 takes an array of bytes (assumed to be values between 0 and 255), interprates them as little endian and converts it to an int16.
function bytesToInt16(b) {
return (b[0] | (b[1] << 8));
}
// bytesToInt32 takes an array of bytes (assumed to be values between 0 and 255), interprates them as little endian and converts it to an int32.
function bytesToInt32(b) {
return (b[0] |
(b[1] << 8) |
(b[2] << 16) |
(b[3] << 24));
}

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cmd/audio-player/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Audio Player</title>
<script type="text/javascript" src="pcm-to-wav.js"></script>
<script type="text/javascript" src="adpcm.js"></script>
<script type="text/javascript" src="main.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
</head>
<body style="height: 100%" onload="load();">
<div class="card m-auto" style="width: 40rem;">
<div class="card-body">
<div class="container-fluid">
URL: <input type="text" id="url" class="url mb-3 mx-3" onchange="load();"><button onclick="load();">Load</button>
</div>
<div class="container-fluid">
<a id="link" href=""></a>
</div>
<div style="height: 1rem">
</div>
<div class="container-fluid">
<div class="form-group">
<input class="form-control-file" type="file" id="fileinput" onchange="processData();">
</div>
</div>
<div class="container-fluid">
<audio class="mx-auto" controls="controls" id="audio">
Your browser does not support the <code>audio</code> element.
<source id="source" src="" type="audio/wav" />
</audio>
</div>
</div>
</div>
<footer id="sticky-footer" class="footer fixed-bottom py-4 bg-dark text-white-50" style="width: 100%;">
<div class="container text-center">
<small>&copy;2019 Australian Ocean Laboratory Limited (AusOcean) (<a rel="license" href="https://www.ausocean.org/license">License</a>)</small>
</div>
</footer>
</body>
</html>

104
cmd/audio-player/main.js
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/*
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 TODO(Trek): make these configurable.
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;
}
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 = "media.ts";
link.innerHTML = "Download";
} else {
console.log('There was a problem with the request.');
}
}
}
request.open("GET", url, true);
request.send();
}

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cmd/audio-player/pcm-to-wav.js
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/*
NAME
pcm-to-wav.js
AUTHOR
Trek Hopton <trek@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).
*/
// pcmToWav takes raw pcm data along with the sample rate, number of channels and bit-depth,
// and adds a WAV header to it so that it can be read and played by common players.
// input and output data bytes are represented as arrays of 8 bit integers.
// WAV spec.: http://soundfile.sapp.org/doc/WaveFormat/
function pcmToWav(data, rate, channels, bitdepth) {
subChunk2ID = [100, 97, 116, 97]; // "data"
subChunk2Size = int32ToBytes(data.length);
subChunk1ID = [102, 109, 116, 32]; // "fmt "
subChunk1Size = int32ToBytes(16);
audioFmt = int16ToBytes(1); // 1 = PCM
numChannels = int16ToBytes(channels);
sampleRate = int32ToBytes(rate);
byteRate = int32ToBytes(rate * channels * bitdepth / 8);
blockAlign = int16ToBytes(channels * bitdepth / 8);
bitsPerSample = int16ToBytes(bitdepth)
chunkID = [82, 73, 70, 70]; // "RIFF"
chunkSize = int32ToBytes(36 + data.length);
format = [87, 65, 86, 69]; // "WAVE"
result = chunkID;
result.push(...chunkSize, ...format, ...subChunk1ID, ...subChunk1Size, ...audioFmt, ...numChannels, ...sampleRate, ...byteRate, ...blockAlign, ...bitsPerSample, ...subChunk2ID, ...subChunk2Size);
return result.concat(data);
}
// int32ToBytes takes a number assumed to be an int 32 and converts it to an array containing bytes (Little Endian).
function int32ToBytes(num) {
return [
(num & 0x000000ff),
(num & 0x0000ff00) >> 8,
(num & 0x00ff0000) >> 16,
(num & 0xff000000) >> 24
];
}
// int16ToBytes takes a number assumed to be an int 16 and converts it to an array containing bytes (Little Endian).
function int16ToBytes(num) {
return [(num & 0x00ff), (num & 0xff00) >> 8];
}