[Webkit-unassigned] [Bug 224279] OfflineAudioContext startRendering fail after N calls

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224279

--- Comment #6 from Chris Dumez <cdumez at apple.com> ---
(In reply to Jason from comment #5)
> I have further narrowed down the issue to just the instantiation of the
> OfflineAudioContext.  Number of instantiations until you receive the error
> is based on the length param.  The larger the length, the sooner you will
> encounter the issue.  With length 4000 * 44100, iOS 14.4.2 starts throwing
> errors on the 2nd instantiation.  Desktop safari (Version 14.0.3
> (16610.4.3.1.7)) will show the same errors as iOS "The string did not match
> the expected pattern" after ~20 iterations, then crash or reload the page.
> 
> https://codepen.io/jasonmcaffee/pen/wvgrqLb
> 
> ```
> const AudioContext = window.AudioContext || window.webkitAudioContext;
> const OfflineAudioContext = window.OfflineAudioContext ||
> window.webkitOfflineAudioContext;
> 
> //demonstrate that iOS starts crashing or erroring when performing offline
> renders more than N times.
> async function main(){
>   const sampleRate = 44100;
>   const length = 4000 * sampleRate;
>   for(let i = 0; i < 60; ++i){
>     print(`rendering ${i}`);
>     try{
>       new OfflineAudioContext(2, length, sampleRate);
>     }catch(e){
>       print(`error rendering offline: `, e.message);
>     }
>   }
>   print(`done`);
> }
> 
> const outputEl = document.querySelector('#output');
> function print<T extends unknown>(...params: T[]){
>   const message = params.map(p => JSON.stringify(p).replace(/['"]+/g,
> '')).join(` `);
>   outputEl.innerHTML += `${message}<br/>`;
> }
> 
> main();
> ```

Thanks, this is very helpful.

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