[M4IF Technotes] InputSensor

[Cyril Concolato]

Hi Christian,
> Did someone tried or managed it to create a scene using an InputSensor
> (e.g. a KeySensor or MouseSensor)? 
Yes, we did.
> I would be interested in the Syntax (in textual description) of the ineraction > elementary stream. 
You do not need to specify the syntax of the interaction stream. But you
need to specify which kind of device you will use in conjunction with
the InputSensor node. There are currently three types of devices defined
in MPEG: a KeySensor device, a StringSensor device and a Mouse device.
Theses devices produce some data that the BIFS decoder will interpret
and forward to the scene so that your scene changes. To have some
interaction with the scene, you need to do two things: 
* First specify the type of device that you will use. You do it by
setting the right device name in the DecoderConfigDescriptor that
describes the device stream. 
* Second, specify in the scene what you want to do with the device data.
This is done through an InputSensor node linked to that device stream.
As usua, the device stream is represented by an ObjectDescriptor. This
latter is referenced in the url field of the InputSensor node. Then the
buffer of the node contains as many commands as there are units of data
in the device data. For instance, a mouse will produce X, Y and a
boolean. So there are 3 units of data, hence three replace commands in
the InputSensor. These replace commands mean: replace some value in the
scene with X, replace some other with Y and finally some other again
with the boolean.
> Does anyone know if the envivoTV plugin is able to play such scene?
Not that I know of. But I do know they are willing to.
> Any hints are welcome.
Here is a BT file.
Hope it helps,
Cyril
-- 
Ecole Nationale Supérieure des Télécommunications, Paris
Dept. Comelec
46, rue Barrault 75013 Paris                
Tel: +33145817991    Fax: +33145804036
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