Commit 52c3c780 authored by Karan Goel's avatar Karan Goel
Browse files

add a visualizer

parent 0091f3c8
# Auto detect text files and perform LF normalization
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*.cs diff=csharp
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## Eclipse
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*.pydevproject
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bin/
tmp/
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*.bak
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*~.nib
local.properties
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The MIT License (MIT)
Copyright (c) 2013 Michael Bromley <michael@michaelbromley.co.uk>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
# Soundcloud Visualizer
This is an experiment in using the web audio API together with canvas to make some interesting and cool-looking visualizations.
Since this is my first foray into the world of both canvas and web audio, I have slowly iterated over a number of ideas and trials which are all in the `/tests` folder.
The visual style was inspired by the artwork of the album ["The Resistance"] (http://en.wikipedia.org/wiki/File:Theresistance.jpg) by Muse.
Thanks to [Soundcloud] (https://soundcloud.com) for providing a great open API!
# Demo
[Here's a working demo] (http://www.michaelbromley.co.uk/experiments/soundcloud-vis/#muse/undisclosed-desires). Enjoy and share!
# Instructions
Go to [https://soundcloud.com] (https://soundcloud.com) and find some music. From the individual song page, copy the url and paste it into the input of the visualizer, then hit enter or press the play button.
You'll notice that part of the the track URL is added to the visualizer's URL. This makes it possible to easily save or share the state. So, if you find a good track that looks cool with
the visualization that you want to share, just give the new URL to someone and when they load it up, it'll automatically start streaming and visualizing that track.
## Playlists
Playlists (also known as "sets" in Soundcloud) can now be pasted into the visualizer, which will cause the whole playlist to play in sequence. You can navigate the playlist using the controls below.
## Controls
- `spacebar` = toggle play/pause
- `>` (right arrow key) = skip forward to next track in playlist
- `<` (left arrow key) = skip backward to previous track in playlist
# Issues
Since the web audio API is pretty new, browser support is patchy:
- *Chrome* Latest versions works well, that's what I've been building in.
- *Firefox* This *should* work, since it has supported web audio since version 25, but in my tests the audio fails to play. Any suggestions?
- *Safari* I haven't tested it since I'm stuck with the dead Windows version, but I guess it should work since it's WebKit.
- *IE* Nope.
- *Opera* Not tested but maybe now that they switched to WebKit.
# Improvements
I can think of a few improvements that I might implement, or someone else might want to:
~~- Support for playlists. So you can paste the playlist URL and it just keeps going through to the end of the playlist.~~ - DONE (thanks to [adg29](https://github.com/adg29))
- More types of visualization. I've written the code in a pretty modular way so it's simple to write a visualization that can plug into the app (see below)
- Better browser support. I'm sure there can be more done on this to get it working at least in Firefox and mobile WebKit browsers, with perhaps fallbacks for IE.
# Writing visualizations
If you want to fork this and write your own visualizations, they way I've set it up is pretty simple:
The audio data from Soundcloud is processed by the SoundCloudAudioSource object, which exposes two properties, `volume` and `streamData`, which are continuously updated in real-time.
`streamData` is an array of 128 integers from 0-255, representing the volume of the signal at each frequency.
`volume` is a single integer representing the overall volume, useful for things like pulsing effects that reflect the beat of the audio track.
Your visualization object just needs to consume this object and then it will be able to do whatever it wants to with the data provided. The visualization object should make
it's own canvas elements and append them to the `#visualizer` div.
# License
MIT
/*! normalize.css v2.1.3 | MIT License | git.io/normalize */
/* ==========================================================================
HTML5 display definitions
========================================================================== */
/**
* Correct `block` display not defined in IE 8/9.
*/
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
display: block;
}
/**
* Correct `inline-block` display not defined in IE 8/9.
*/
audio,
canvas,
video {
display: inline-block;
}
/**
* Prevent modern browsers from displaying `audio` without controls.
* Remove excess height in iOS 5 devices.
*/
audio:not([controls]) {
display: none;
height: 0;
}
/**
* Address `[hidden]` styling not present in IE 8/9.
* Hide the `template` element in IE, Safari, and Firefox < 22.
*/
[hidden],
template {
display: none;
}
/* ==========================================================================
Base
========================================================================== */
/**
* 1. Set default font family to sans-serif.
* 2. Prevent iOS text size adjust after orientation change, without disabling
* user zoom.
*/
html {
font-family: sans-serif; /* 1 */
-ms-text-size-adjust: 100%; /* 2 */
-webkit-text-size-adjust: 100%; /* 2 */
}
/**
* Remove default margin.
*/
body {
margin: 0;
}
/* ==========================================================================
Links
========================================================================== */
/**
* Remove the gray background color from active links in IE 10.
*/
a {
background: transparent;
}
/**
* Address `outline` inconsistency between Chrome and other browsers.
*/
a:focus {
outline: thin dotted;
}
/**
* Improve readability when focused and also mouse hovered in all browsers.
*/
a:active,
a:hover {
outline: 0;
}
/* ==========================================================================
Typography
========================================================================== */
/**
* Address variable `h1` font-size and margin within `section` and `article`
* contexts in Firefox 4+, Safari 5, and Chrome.
*/
h1 {
font-size: 2em;
margin: 0.67em 0;
}
/**
* Address styling not present in IE 8/9, Safari 5, and Chrome.
*/
abbr[title] {
border-bottom: 1px dotted;
}
/**
* Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome.
*/
b,
strong {
font-weight: bold;
}
/**
* Address styling not present in Safari 5 and Chrome.
*/
dfn {
font-style: italic;
}
/**
* Address differences between Firefox and other browsers.
*/
hr {
-moz-box-sizing: content-box;
box-sizing: content-box;
height: 0;
}
/**
* Address styling not present in IE 8/9.
*/
mark {
background: #ff0;
color: #000;
}
/**
* Correct font family set oddly in Safari 5 and Chrome.
*/
code,
kbd,
pre,
samp {
font-family: monospace, serif;
font-size: 1em;
}
/**
* Improve readability of pre-formatted text in all browsers.
*/
pre {
white-space: pre-wrap;
}
/**
* Set consistent quote types.
*/
q {
quotes: "\201C" "\201D" "\2018" "\2019";
}
/**
* Address inconsistent and variable font size in all browsers.
*/
small {
font-size: 80%;
}
/**
* Prevent `sub` and `sup` affecting `line-height` in all browsers.
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sup {
top: -0.5em;
}
sub {
bottom: -0.25em;
}
/* ==========================================================================
Embedded content
========================================================================== */
/**
* Remove border when inside `a` element in IE 8/9.
*/
img {
border: 0;
}
/**
* Correct overflow displayed oddly in IE 9.
*/
svg:not(:root) {
overflow: hidden;
}
/* ==========================================================================
Figures
========================================================================== */
/**
* Address margin not present in IE 8/9 and Safari 5.
*/
figure {
margin: 0;
}
/* ==========================================================================
Forms
========================================================================== */
/**
* Define consistent border, margin, and padding.
*/
fieldset {
border: 1px solid #c0c0c0;
margin: 0 2px;
padding: 0.35em 0.625em 0.75em;
}
/**
* 1. Correct `color` not being inherited in IE 8/9.
* 2. Remove padding so people aren't caught out if they zero out fieldsets.
*/
legend {
border: 0; /* 1 */
padding: 0; /* 2 */
}
/**
* 1. Correct font family not being inherited in all browsers.
* 2. Correct font size not being inherited in all browsers.
* 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome.
*/
button,
input,
select,
textarea {
font-family: inherit; /* 1 */
font-size: 100%; /* 2 */
margin: 0; /* 3 */
}
/**
* Address Firefox 4+ setting `line-height` on `input` using `!important` in
* the UA stylesheet.
*/
button,
input {
line-height: normal;
}
/**
* Address inconsistent `text-transform` inheritance for `button` and `select`.
* All other form control elements do not inherit `text-transform` values.
* Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+.
* Correct `select` style inheritance in Firefox 4+ and Opera.
*/
button,
select {
text-transform: none;
}
/**
* 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
* and `video` controls.
* 2. Correct inability to style clickable `input` types in iOS.
* 3. Improve usability and consistency of cursor style between image-type
* `input` and others.
*/