[mythtv] Aspect ratio changes

[Torbjörn Jansson]

Has anyone thougth about adding wss support?
If I remember right this is some kind of embedded teletext like signal that
some tv stations send so wide screen tvs can adjust the aspect ratio
automaticaly.

> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org 
> [mailto:mythtv-dev-bounces at mythtv.org] On Behalf Of steve at nexusuk.org
> Sent: Monday, January 05, 2004 7:32 PM
> To: mythtv-dev at mythtv.org
> Subject: [mythtv] Aspect ratio changes
> 
> 
> My Sky box (and most other decoders) use pin 8 of the SCART 
> connector to 
> tell the TV what aspect ratio it should be running in (5v for 
> 16:9 and 12v 
> for 4:3).  I would like to include information of aspect 
> ratio changes 
> provided by this signal in the stored video, so I would like 
> comments on 
> the following idea:
> 
> Pin 8 of the input SCART connector would be connected to a 
> serial port on 
> the backend via a suitable circuit.
> 
> Pin 8 of the output SCART connector would be connected to a 
> serial port on 
> the frontend via a suitable circuit (if the frontend and the 
> backend are 
> the same machine then this may be the same serial port)
> 
> A separate daemon would watch the serial port for changes in 
> the input 
> signal and relay them to the backend via a unix domain 
> socket.  Similarly 
> the frontend would be able to send aspect ratio changes to 
> the daemon via 
> the unix domain socket.
> 
> Now, the bit I'm not sure about is how to incorporate the 
> data into the 
> video stream - I'm thinking of doing the same as the 
> NuppelVideoRecorder::WriteText() function but use a different 
> frametype.  
> Would this seem to be the best way to handle the data?
> 
> There would be a user configurable option to tell the 
> frontend whether to 
> send signals to the daemon when it wants to change the aspect 
> ratio or to 
> use the existing aspect ratio changing code (which scales the video).
> 
> -- 
> 
>  - Steve                                             
> http://www.nexusuk.org/
> 
>      Servatis a periculum, servatis a maleficum - Whisper, Evanescence
> 
>