- From: Gordon P. Hemsley <gphemsley@gmail.com>
- Date: Thu, 29 Nov 2012 12:45:35 -0500
- To: Boris Zbarsky <bzbarsky@mit.edu>
- Cc: whatwg@lists.whatwg.org
On Thu, Nov 29, 2012 at 3:02 AM, Boris Zbarsky <bzbarsky@mit.edu> wrote: > On 11/29/12 2:53 AM, Gordon P. Hemsley wrote: >> >> At one point it says, "The MIME type "application/octet-stream" with >> no parameters is never a type that the user agent knows it cannot >> render. User agents must treat that type as equivalent to the lack of >> any explicit Content-Type metadata when it is used to label a >> potential media resource." >> >> But later it says, "The canPlayType(type) method must return the empty >> string if type is a type that the user agent knows it cannot render or >> is the type "application/octet-stream";" > > > What's the contradiction? We have set S = { types the user agent knows it > cannot render }. We have set T = S union { application/octet-stream } > > What the above statements tell us so far is: > > 1) T != S > 2) canPlayType(type) must return empty string for all types in T. > > But later on in the resource selection algorithm there are certain actions > taken for elements of S only. > > >> This seems to me to be unclear as to when sniffing of the audio/video >> resource occurs, and what it is used for. > > > It's used for actually showing the video even if it's sent as > application/octet-stream. The apparent contradiction occurs when, e.g., an Opus file is tagged as "application/octet-stream". If I understand correctly, a UA would return "" when canPlayType() is called against such a file—but then the file would actually play because it is later sniffed as "application/ogg". Am I missing something? -- Gordon P. Hemsley me@gphemsley.org http://gphemsley.org/ • http://gphemsley.org/blog/
Received on Thursday, 29 November 2012 18:12:41 UTC