Re: xAP-Audio schema questions....

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

PLEASE could some of the people who had an input into this schema & any
other interested parties comment on the suggestions I made .... there
are commercial developers waiting on this.

or shall we just adopt them as is !!

Kevin

Kevin Hawkins wrote:

>This is a posting of a couple of email exchanges now moved to this list
>as it is of interest to all I feel.
>
>
>Hi P - yes I can see why you've done that ...
>
>In re-reading the schema I understand how certain .events are sent but
I
>am still unsure of some and I can't see a list of the 'modes' for
>example and what should be sent if say a player is put into pause or FF
>or whatever. I also see there is a refererence to allowing the .events
>to be sent 'as needed'
>
>It strikes me we could do with defining some additional time related
>parameters for inclusion in the event reporting timeline including
>
>Duration  <mandatory>
>StartTime <mandatory>
>EndTime <mandatory>
>CurrentTime  <mandatory>
>ElapsedTime   <optional ?>
>RemainingTime  <optional ?>
>
>.. and that these should be sent periodically at a frequency that is
>configurable as different users might want tighter feedback. 10 secs
>sounds a useful time for most implementations. Towards the end of the
>current track it may be desireable to increase the frequency of events
>
>Just to expand on the above time information I was considering what
>would happen if a player was asked to play a track whose duration was
>say 5 mins but starting at position 1min22secs and ending at 1min44secs
>which I think our schema should/does support (the actual time being
down
>to 100'ths of a sec perhaps).The current 'Duration' is the length of
the
>whole track and the currentTime the exact current position relative to
>that. The StartTime and EndTime are the actual markers for what section
>is to be played. ElapsedTime and RemainingTime can be derived from the
>other values but could be defined such that they can be inserted as
>optional .
>
>What does anyone think ? I think this is needed and I am keen to
resolve
>it whilst Malcolm is focussed on teh xAP aspects of TelCanto.  Edward
>and Stuart I would particularly value your comments as you are the two
>who have done this practically already...
>
>    Kevin
>
>
>Patrick Lidstone wrote:
>
>
>
>>I do an "elapsed time" event which includes current play
state for the
>>Rio stuff (sent once every 10s or so, plus whenever a button causes
a
>>change). This is an integral part of the audio spec - I can dig out
the
>>exact message if no-one else chips in.
>>
>>P.
>>
>>
>>
>>
>>
>>>-----Original Message-----
>>>From: Kevin Hawkins
>>>Sent: 09 December 2004 13:44
>>>
>>>
>>>xAP guys...
>>>
>>>   The newer audio schema isnt one I'm familiar with  so I'm
just
>>>coming up to speed on that as I provide feedback to Malcolm.
What I
>>>can't seem to see is how a player keeps people informed of its
state.
>>>For example when it is paused by a press of the pause button on
the
>>>player or IR remote or FF'wded perhaps causing the track
position to
>>>change (not the actual track just the time remaining).  How do
we
>>>indicate a player is in pause/play or whatever ?.    It strikes
me we
>>>need a whole series of periodic event messages being generated
by a
>>>player that keep people updated about it current state eg 'time
>>>remaining'.  ... and that such event messages should probably
>>>be issued
>>>quite frequently (configurable), particulalry towards the end
>>>of a track
>>>playing (eg track about to end /finished).  Additionally
>>>anything that
>>>causes the estimated time remaining to change should
>>>immediately send an
>>>update (eg a REW) This way monitoring apps can accurately
>>>become synched
>>>with a players status even if they are only turned on half
>>>way through
>>>a  track eg the xAP Desktop SliMP3 display...    I can see
>>>some specific
>>>SliMP3 bits that would help but not in the general schema and
in
>>>telCanto's case it could be driving lots of different clients.
>>>
>>>Or have I missed something ?
>>>
>>>Kevin
>>>
>>>
>>>
>>>
>>>