OfflineAudioContext for faster than realtime decompression

[Doidel]

Hai

May I suggest using OfflineAudioContext for the loading and decoding since it can decode (potentially) faster than realtime. Otherwise, if I have a sound with the length of 1.5 minutes i have to wait 1.5 minutes for it to be decoded.

e.g. what I use is

var AudioContext = window.AudioContext || window.webkitAudioContext;
var OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
this._context = new AudioContext();
this._loaderContext = new OfflineAudioContext(2, 1024, 44100); //22050 to 96000, CD = 44100

While I just use the offlineContext instead of the normal context for decoding.
I wouldn't hardcode the constructor values though since especially the first (and maybe the last parameter) might want to be set by some people.

Thanks for all, cu
Doidel

[jeromeetienne]

@Doidel thanks for report in github :)

what is offlineAudioContext ? what is the difference with AudioContext ?

[Doidel]

If you use the normal audiocontext for decoding e.g. an mp3 file then it takes just as long as the mp3 file lasts. So if your mp3 file's duration is 1.5 minutes then your decompression (or analyzation, etc.) takes 1.5 minutes, which is unbearable.
See W3C specs: https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#OfflineAudioContext-section

[jeromeetienne]

A pull request maybe