W3C home > Mailing lists > Public > public-html@w3.org > February 2011

Re: <video> readyState oddities

From: Ian Hickson <ian@hixie.ch>
Date: Fri, 25 Feb 2011 01:50:07 +0000 (UTC)
To: Philip J├Ągenstedt <philipj@opera.com>
cc: public-html@w3.org
Message-ID: <Pine.LNX.4.64.1102250148120.28618@ps20323.dreamhostps.com>
On Sat, 19 Feb 2011, Philip J├Ągenstedt wrote:
> On Fri, 18 Feb 2011 21:42:46 +0100, Ian Hickson <ian@hixie.ch> wrote:
> > On Thu, 17 Feb 2011, Chris Pearce wrote:
> > > > 
> > > > 2. When you run out of buffered data when playing normally, should 
> > > > readyState revert to HAVE_CURRENT_DATA or HAVE_METADATA? The 
> > > > answer depends on what currentTime is at that point, it seems.
> > > 
> > > Firefox won't drop below HAVE_CURRENT_DATA once it's passed it, the 
> > > logic being that we're still able to display the frame which we're 
> > > currently displaying. So we drop back to HAVE_CURRENT_DATA in this 
> > > case.
> > 
> > The spec currently states that CURRENT_DATA is for when "Data for the 
> > immediate current playback position is available", so per spec this 
> > would be wrong.
> > 
> > I think it is relatively important to have the spec's behaviour; 
> > without it, it's impossible for the author to know if you're 
> > displaying what he wants you to display or if you're still trying to 
> > decode it.
> 
> The spec doesn't quite define how to interpret "current playback 
> position" when you run out of data, or am I missing it?

I don't understand. What is ambiguous? The spec defines everything that 
happens to the current playback position, no?


> I think it would make sense to behave the same way as at the end of the 
> resource, and that HAVE_CURRENT_DATA actually makes sense.

Not sure what you mean.


> The only case where HAVE_METADATA seems right is when nothing has been 
> decoded yet, i.e. when just starting to load the resource and when 
> seeking to an unbuffered time offset.

HAVE_METADATA is the state for when you don't have anything except 
metadata for the current playback position, for example because playback 
is stalled because the UA is still downloading the data for this position.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 25 February 2011 01:50:36 UTC

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