[whatwg] Media resource fetch algorithm reporting failure

[Chris Pearce]

  In the media element resource fetch algorithm [1], there's this step:

<quote>

If the media data 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#media-data> 
cannot be fetched at all, due to network errors, causing the user agent 
to give up trying to fetch the resource [or]
If the media resource 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#media-resource> 
is found to have Content-Type metadata 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/urls.html#content-type> 
that, when parsed as a MIME type 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#mime-type> 
(including any codecs described by the |codecs| parameter), represents a 
type that the user agent knows it cannot render 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#a-type-that-the-user-agent-knows-it-cannot-render> 
(even if the actual media data 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#media-data> 
is in a supported format) [or]
If the media data 
<http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#media-data> 
can be fetched but is found by inspection to be in an unsupported 
format, or can otherwise not be rendered at all

   1.

      The user agent should cancel the fetching process.

   2.

      Abort this subalgorithm, returning to the resource selection
      algorithm
      <http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#concept-media-load-algorithm>.

</quote>

Why don't we dispatch an error event to the candidate source child we 
were loading from, or the media element if it was loading from a source 
attribute, in this case? We dispatch error events in the resource 
selection algorithm if the source child has an unsupported type, how is 
this significantly different?


Regards,
Chris Pearce.

[1] 
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#concept-media-load-resource
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