On Nov 13, 2008, at 10:52 AM, Jeremy Doig wrote:
did this thread go anywhere ?
See http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#dom-navigator-canplaytype
.
i'm concerned about the "maybe" case - looks way too much like:
http://en.wikipedia.org/wiki/DShow#Codec_hell
also - when you probe for mime type, do you mean the entire "type"
parameter (including the codecs string) ? for example, there are too
many cases where just passing "video/mp4" would be insufficient.
(fragmented index support ? base/main/high profile ? paff ? cabac ?)
<source src="video.mp4" type="video/mp4; codecs="avc1.42E01E,
mp4a.40.2"">
My interpretation is that it does, and the vagueness of many MIME
types is the reason for the "maybe" case.
eric
On Wed, Oct 15, 2008 at 11:14 PM, Maciej Stachowiak <[EMAIL PROTECTED]>
wrote:
On Oct 15, 2008, at 1:44 AM, Ian Hickson wrote:
On Tue, 14 Oct 2008, Robert O'Callahan wrote:
On Tue, Oct 14, 2008 at 12:13 PM, Maciej Stachowiak <[EMAIL PROTECTED]>
wrote:
While the underlying media frameworks can't necessarily answer, "if I
give you a file with this MIME type, can you play it?", they can at
least give a yes/no/maybe answer, which can still be quite helpful,
since the UA will know it does not need to check some media streams at
all.
I agree. If the API lets us answer "maybe", there is not much need or
temptation to lie, and we can still return information that could be
useful to scripts.
I have added window.navigator.canPlayType(mimeType). It returns 1,
0, or
-1 to represent positive, neutral, and negative responses.
This API would be tempting to treat as a boolean but would of course
do completely the wrong thing. I think it would be better to either
ensure that the positive and neutral responses are both values that
JS would treat as true (for instance make the values true, "maybe"
and false), or else make all of the return values something self-
descriptive and symbolic (for instance the strings "yes", "maybe"
and "no"). I think 1, 0, -1 are neither clear nor likely to be in
any way beneficial for perforamnce.
Regards,
Maciej
