Re: [apis] propose two use cases regarding tunner control and channel bounded applications

Dear Sung and Wook,

>
> What happens if this is a channel the Client does not have access to 
> (whether it's unavailable in its region, it's a paid tv he didn't 
> subscribed to, ...). I appreciate that's probably a different use case 
> to handle
> [Sung/Wook] I think there are many ways to solve this.
>                     For example, in such case, the STB does not have 
> the key to unscamble that channel.
>                     It may show a blur or blackout.
>                     STB may shows a message telling the viewer that 
> the pertaining channel is not subscribed to.
>                     Anyway, I do not think the web application is 
> aware of the subscription status of the viewer.
>                     If the web application knows the subscription 
> status, a difference use case can be defined.
>

I believe it's important. In the case of a CAM mechanism, the 
application might want to redirect you to a specific page (to subscribe, 
for instance)


> > While the live football game stops for a break, the subscriber 
> changes to different channel which shows a popular drama.
> > The browser shows the popular drama along with list of the 
> characters, title/singer of the OST in the current scene, brand name 
> of the necklace shown, SNS, and other information as supplementary 
> contents.
> > The supplementary contents changes in accordance with the selected 
> TV channel.
> > The channel bounded applications are designed by the pertaining 
> broadcast service operator or trusted third-party.
>
> Do you mean the application has not quit when the user changed to a 
> different channel ? Or did he switch to a new app?
> I would recommend that an app is automatically closed when the user 
> switches to a different channel, unless the broadcast signal 
> explicitely approves such apps. Typically this is when the two 
> channels belong to the same broadcasters and therefore they don't mind 
> keeping the app on screen. But if you switch from a channel to another 
> owned by a different broadcaster, they certainly don't want it to happen
> [Sung/Wook] Agreed. That was our intension.
>                    As with the channel of channel, channel bounded 
> application is automatically closed.
>                    This application is bounded not to broadcaster, but 
> to channel.
>                     For claification, how about adding a new sentence 
> regarding the close of the application of previous channel.
>                     "As the user change the channel, the channel 
> bounded application of the previous channel is closed."
>                     Also, we have change the sentence "The 
> supplementary contents changes in accordance with the selected TV 
> channel."
>                     to "The channel bounded applications of the 
> selected TV channel is launched for providing such supplementary 
> contents." for clarification.
I think it's a little bit limitative wrt other existing app models such 
as Ginga or HbbTV, where a broadcaster has the capability to maintain an 
application between different channels it owns (and of course not on a 
channel from a different broadcaster)

Regards
JC