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Using the library from the file-protocol possible?

See original GitHub issue

This library is awesome and works pretty good!

Here’s one thing, though (I don’t know, if this can get solved using wasm at all):

Since mediainfo uses fetch to load data, I’m unable to run it from the file:// protocol. I tried to polyfill `fetch, but get this error:

wasm streaming compile failed: TypeError: Failed to execute ‘compile’ on ‘WebAssembly’: An argument must be provided, which must be a Response or Promise<Response> object

Any hint, if it is even possible to use mediainfo.js from the file://protocol?

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:10 (3 by maintainers)

github_iconTop GitHub Comments

tiptroniccommented, Mar 27, 2020

@buzz @JeromeMartinez

Just for completeness sake: Overwriting fetch with a promisified XMLHttpRequest does the job pretty good. For me it now works on all required browsers (and also on the file:// protocol). Here’s the quick code (it just emulates fetch’s request returning a promised ‘arraybuffer’ ):

window.fetch = ( ...inParm ) => {
    const path = inParm[ 0 ];
    return new Promise( function( resolve, reject ) {
        const req = new XMLHttpRequest();
        req.withCredentials = true; // should be default anyway
        req.responseType = 'arraybuffer';

        req.addEventListener( 'load', () => {
            resolve( {
                ok: true,
                arrayBuffer: () => Promise.resolve( req.response )
            } );
        } );

        [ 'abort', 'error' ].forEach( ( evt ) => { req.addEventListener( evt, ( error ) => { reject( error ) } ) } ); 'GET', path );
    } )

Thanks again for your kind help!

buzzcommented, Apr 7, 2020

Closing issue as it seems to be resolved.

Read more comments on GitHub >

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