[mythtv] Aspect ratio changes
steve at nexusuk.org
steve at nexusuk.org
Mon Jan 5 13:32:13 EST 2004
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
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