javascript - Issues with HTML5 Audio Visualiser -


i experimenting code found on website. source of here:

http://themaninblue.com/experiment/webaudioapi/source.zip

now thing is: local file works fine, when attempt connect file on internet (basically changing src attribute audio), plays, can't hear anything. further, visualizer not doing anything.

edit: thing changed in html code is:

<audio id="music" src="http://www.mfiles.co.uk/mp3-downloads/edvard-grieg-peer-gynt1-morning-mood.mp3" autoplay controls preload="auto" ></audio>

i used <body onload="init()"> instead of event listener. haven't changed else

what may done such visualizer work online files (or streams)?

anything allows read , analyze bits , bytes such byte arrays (xmlhttprequest), audio data (web audio api) or image data (via canvas 2d context) restricted cross-origin resource sharing, or cors short.

it related security , browsers prevent cors usage if source server doesn't allow such usage, , source server (origin) not same page itself.

the way around either:

  1. copy file same server (or origin) page loading from
  2. configure remote server allow cors usage - if don't have access not option
  3. set proxy page on own server (the same page playing audio) on server side loads audio file , hand through server page.

if server allow cors usage can try add crossorigin attribute tag:

<audio id="music"         crossorigin = "anonymous"        src="http://www.mfiles.co.uk/mp3-downloads/edvard-grieg-peer-gynt1-morning-mood.mp3"         autoplay         controls         preload="auto" > </audio>

see this link further details.


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