mirror of https://bitbucket.org/ausocean/av.git
audio-player: moving to vidgrind repo
This commit is contained in:
Trek H
parent
3f7306f2a8
commit
6e080b2522
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@ -1,179 +0,0 @@
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/*
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NAME
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adpcm.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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/*
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Original IMA/DVI ADPCM specification: (http://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf).
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Reference algorithms for ADPCM compression and decompression are in part 6.
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*/
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class Decoder {
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constructor() {
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this.est = 0; // Estimation of sample based on quantised ADPCM nibble.
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this.idx = 0; // Index to step used for estimation.
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this.step = 0;
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}
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// Table of index changes (see spec).
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static get indexTable() {
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return [
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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];
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}
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// Quantize step size table (see spec).
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static get stepTable() {
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return [
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7, 8, 9, 10, 11, 12, 13, 14,
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16, 17, 19, 21, 23, 25, 28, 31,
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34, 37, 41, 45, 50, 55, 60, 66,
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73, 80, 88, 97, 107, 118, 130, 143,
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157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658,
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724, 796, 876, 963, 1060, 1166, 1282, 1411,
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1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
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3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
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7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
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32767
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];
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}
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static get byteDepth() { return 2; } // We are working with 16-bit samples.
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static get headSize() { return 8; } // Number of bytes in the header of ADPCM.
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static get chunkLenSize() { return 4; } // Length in bytes of the chunk length field in header.
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static get compFact() { return 4; } // In general ADPCM compresses by a factor of 4.
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// decodeSample takes 4 bits which represents a single ADPCM nibble, and returns a 16 bit decoded PCM sample.
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decodeSample(nibble) {
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let diff = 0;
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if ((nibble & 4) != 0) {
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diff += this.step;
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}
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if ((nibble & 2) != 0) {
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diff += this.step >> 1;
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}
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if ((nibble & 1) != 0) {
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diff += this.step >> 2;
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}
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diff += this.step >> 3;
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if ((nibble & 8) != 0) {
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diff = -diff;
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}
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this.est += diff;
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this.idx += Decoder.indexTable[nibble];
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if (this.idx < 0) {
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this.idx = 0;
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} else if (this.idx > Decoder.stepTable.length - 1) {
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this.idx = Decoder.stepTable.length - 1;
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}
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this.step = Decoder.stepTable[this.idx];
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return this.est;
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}
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// decode takes an array of bytes of arbitrary length representing adpcm and decodes it into pcm.
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decode(b) {
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let result = new Uint16Array(Decoder.decBytes(b)/Decoder.byteDepth);
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let resultOff = 0;
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// Iterate over each chunk and decode it.
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let chunkLen;
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for (let off = 0; off + Decoder.headSize <= b.length; off += chunkLen) {
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// Read length of chunk and check if whole chunk exists.
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chunkLen = Decoder.bytesToInt32(b.slice(off, off + Decoder.chunkLenSize))
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if (off + chunkLen > b.length) {
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break;
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}
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// Initialize Decoder.
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this.est = Decoder.bytesToInt16(b.slice(off + Decoder.chunkLenSize, off + Decoder.chunkLenSize + Decoder.byteDepth));
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this.idx = b[off + Decoder.chunkLenSize + Decoder.byteDepth];
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this.step = Decoder.stepTable[this.idx];
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result[resultOff] = Decoder.bytesToInt16(b.slice(off + Decoder.chunkLenSize, off + Decoder.chunkLenSize + Decoder.byteDepth));
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resultOff++;
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for (let i = off + Decoder.headSize; i < off + chunkLen - b[off + Decoder.chunkLenSize + 3]; i++) {
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let twoNibs = b[i];
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let nib2 = twoNibs >> 4;
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let nib1 = (nib2 << 4) ^ twoNibs;
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let sample1 = this.decodeSample(nib1);
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result[resultOff] = sample1;
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resultOff++;
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let sample2 = this.decodeSample(nib2);
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result[resultOff] = sample2;
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resultOff++;
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}
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if (b[off + Decoder.chunkLenSize + 3] == 1) {
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let padNib = b[off + chunkLen - 1];
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let sample = this.decodeSample(padNib);
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result[resultOff] = sample;
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resultOff++;
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}
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}
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return result;
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}
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// 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.
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static bytesToInt16(b) {
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return (b[0] | (b[1] << 8));
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}
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// 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.
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static bytesToInt32(b) {
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return (b[0] |
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(b[1] << 8) |
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(b[2] << 16) |
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(b[3] << 24));
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}
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// decBytes takes a parameter that is assumed to be a byte array containing one or more adpcm chunks.
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// It reads the chunk lengths from the chunk headers to calculate and return the number of pcm bytes that are expected to be decoded from the adpcm.
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static decBytes(b){
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let chunkLen;
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let n = 0;
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for (let off = 0; off + Decoder.headSize <= b.length; off += chunkLen) {
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chunkLen = Decoder.bytesToInt32(b.slice(off, off + Decoder.chunkLenSize))
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if (off + chunkLen > b.length) {
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break;
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}
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// Account for uncompressed sample in header.
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n += Decoder.byteDepth;
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// Account for PCM bytes that will result from decoding ADPCM.
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n += (chunkLen - Decoder.headSize)*Decoder.compFact;
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// Account for padding.
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if(b[off+Decoder.chunkLenSize+3] == 0x01){
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n -= Decoder.byteDepth;
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}
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}
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return n;
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}
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}
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Binary file not shown.
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Before Width: | Height: | Size: 15 KiB |
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@ -1,44 +0,0 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Audio Player</title>
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<script type="text/javascript" src="pcm-to-wav.js"></script>
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<script type="text/javascript" src="adpcm.js"></script>
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<script type="text/javascript" src="main.js"></script>
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<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">
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</head>
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<body style="height: 100%" onload="load();">
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<div class="card m-auto" style="width: 40rem;">
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<div class="card-body">
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<div class="container-fluid">
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URL: <input type="text" id="url" class="url mb-3 mx-3" onchange="load();"><button onclick="load();">Load</button>
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</div>
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<div class="container-fluid">
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<a id="link" href=""></a>
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</div>
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<div style="height: 1rem">
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</div>
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<div class="container-fluid">
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<div class="form-group">
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<input class="form-control-file" type="file" id="fileinput" onchange="playFile();">
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</div>
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</div>
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<div class="container-fluid">
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<audio class="mx-auto" controls="controls" id="audio">
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Your browser does not support the <code>audio</code> element.
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<source id="source" src="" type="audio/wav" />
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</audio>
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</div>
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</div>
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</div>
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<footer id="sticky-footer" class="footer fixed-bottom py-4 bg-dark text-white-50" style="width: 100%;">
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<div class="container text-center">
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<small>©2019 Australian Ocean Laboratory Limited (AusOcean) (<a rel="license" href="https://www.ausocean.org/license">License</a>)</small>
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</div>
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</footer>
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</body>
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</html>
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@ -1,108 +0,0 @@
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/*
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NAME
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main.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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Alan Noble <alan@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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// playFile will process and play the chosen target file.
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function playFile() {
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const input = event.target.files[0]
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const reader = new FileReader()
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reader.onload = event => {
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bytes = new Uint8Array(event.target.result);
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let dec = new Decoder();
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// Decode adpcm to pcm.
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let decoded = dec.decode(bytes);
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// Convert raw pcm to wav TODO(Trek): make these configurable.
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let wav = pcmToWav(new Uint8Array(decoded.buffer), 48000, 1, 16);
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// Play wav data in player.
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const blob = new Blob([wav], {
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type: 'audio/wav'
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});
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const url = URL.createObjectURL(blob);
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const audio = document.getElementById('audio');
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const source = document.getElementById('source');
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source.src = url;
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audio.load();
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audio.play();
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}
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reader.onerror = error => reject(error)
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reader.readAsArrayBuffer(input)
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}
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// getQuery gets everything after the question mark in the URL.
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function getQuery() {
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let regex = new RegExp("\\?(.*)");
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let match = regex.exec(window.location.href);
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if (match == null) {
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return '';
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} else {
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return decodeURIComponent(match[1].replace(/\+/g, " "));
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}
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}
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// load gets the file from the given url and displays a link for download.
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function load() {
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let url = document.getElementById('url').value;
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if (url == "") {
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url = getQuery()
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document.getElementById('url').value = url;
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}
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if (url[0] == '/') {
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url = window.location.protocol + '//' + window.location.host + url;
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}
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if (url == "") {
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return;
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}
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let request = new XMLHttpRequest();
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request.responseType = "blob";
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request.onreadystatechange = function () {
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if (request.readyState === XMLHttpRequest.DONE) {
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if (request.status === 200) {
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console.log("request received");
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data = request.response;
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dataURL = URL.createObjectURL(data);
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let link = document.getElementById("link");
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link.href = dataURL;
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link.download = "media.ts";
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link.innerHTML = "Download";
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} else {
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console.log('There was a problem with the request. Status: ' + request.status);
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}
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}
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}
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request.open("GET", url, true);
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request.send();
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}
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@ -1,97 +0,0 @@
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/*
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NAME
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pcm-to-wav.js
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AUTHOR
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Trek Hopton <trek@ausocean.org>
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LICENSE
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This file is Copyright (C) 2018 the Australian Ocean Lab (AusOcean)
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
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for more details.
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You should have received a copy of the GNU General Public License in gpl.txt.
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If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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// pcmToWav takes raw pcm data along with the sample rate, number of channels and bit-depth,
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// and adds a WAV header to it so that it can be read and played by common players.
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// Input should be a Uint16Array containing 16 bit PCM samples, output will be a Uint8Array representing the bytes of the wav file.
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// WAV spec.: http://soundfile.sapp.org/doc/WaveFormat/
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function pcmToWav(data, rate, channels, bitdepth) {
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let subChunk2ID = [100, 97, 116, 97]; // "data".
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let subChunk2Size = int32ToBytes(data.length);
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let subChunk1ID = [102, 109, 116, 32]; // "fmt ".
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let subChunk1Size = int32ToBytes(16);
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let audioFmt = int16ToBytes(1); // 1 = PCM.
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let numChannels = int16ToBytes(channels);
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let sampleRate = int32ToBytes(rate);
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let byteRate = int32ToBytes(rate * channels * bitdepth / 8);
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let blockAlign = int16ToBytes(channels * bitdepth / 8);
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let bitsPerSample = int16ToBytes(bitdepth)
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let chunkID = [82, 73, 70, 70]; // "RIFF".
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let chunkSize = int32ToBytes(36 + data.length);
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let format = [87, 65, 86, 69]; // "WAVE".
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let result = new Uint8Array((data.length*2) + 44);
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let off = 0;
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result.set(chunkID, off);
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off += 4;
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result.set(chunkSize, off);
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off += 4;
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result.set(format, off);
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off += 4;
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result.set(subChunk1ID, off);
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off += 4;
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result.set(subChunk1Size, off);
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off += 4;
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result.set(audioFmt, off);
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off += 2;
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result.set(numChannels, off);
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off += 2;
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result.set(sampleRate, off);
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off += 4;
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result.set(byteRate, off);
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off += 4;
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result.set(blockAlign, off);
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off += 2;
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result.set(bitsPerSample, off);
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off += 2;
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result.set(subChunk2ID, off);
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off += 4;
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result.set(subChunk2Size, off);
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off += 4;
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result.set(data, off);
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return result;
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}
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// int32ToBytes takes a number assumed to be an int 32 and converts it to an array containing bytes (Little Endian).
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function int32ToBytes(num) {
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let b = new Uint8Array(4);
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b[0] = (num & 0x000000ff);
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b[1] = (num & 0x0000ff00) >> 8;
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b[2] = (num & 0x00ff0000) >> 16;
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b[3] = (num & 0xff000000) >> 24;
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return b;
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}
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// int16ToBytes takes a number assumed to be an int 16 and converts it to an array containing bytes (Little Endian).
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function int16ToBytes(num) {
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let b = new Uint8Array(2);
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b[0] = (num & 0x00ff);
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b[1] = (num & 0xff00) >> 8;
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return b;
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}
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