37 lines
1.2 KiB
ReStructuredText
37 lines
1.2 KiB
ReStructuredText
|
.. -*- coding: utf-8; mode: rst -*-
|
|||
|
|
|
|||
|
|
.. _dvb_video:
|
|||
|
|
|
|||
|
|
#######################
|
|||
|
|
Digital TV Video Device
|
|||
|
|
#######################
|
|||
|
|
|
|||
|
|
The Digital TV video device controls the MPEG2 video decoder of the Digital
|
|||
|
|
TV hardware. It can be accessed through **/dev/dvb/adapter0/video0**. Data
|
|||
|
|
types and and ioctl definitions can be accessed by including
|
|||
|
|
**linux/dvb/video.h** in your application.
|
|||
|
|
|
|||
|
|
Note that the Digital TV video device only controls decoding of the MPEG video
|
|||
|
|
stream, not its presentation on the TV or computer screen. On PCs this
|
|||
|
|
is typically handled by an associated video4linux device, e.g.
|
|||
|
|
**/dev/video**, which allows scaling and defining output windows.
|
|||
|
|
|
|||
|
|
Some Digital TV cards don’t have their own MPEG decoder, which results in the
|
|||
|
|
omission of the audio and video device as well as the video4linux
|
|||
|
|
device.
|
|||
|
|
|
|||
|
|
The ioctls that deal with SPUs (sub picture units) and navigation
|
|||
|
|
packets are only supported on some MPEG decoders made for DVD playback.
|
|||
|
|
|
|||
|
|
These ioctls were also used by V4L2 to control MPEG decoders implemented
|
|||
|
|
in V4L2. The use of these ioctls for that purpose has been made obsolete
|
|||
|
|
and proper V4L2 ioctls or controls have been created to replace that
|
|||
|
|
functionality.
|
|||
|
|
|
|||
|
|
|
|||
|
|
.. toctree::
|
|||
|
|
:maxdepth: 1
|
|||
|
|
|
|||
|
|
video_types
|
|||
|
|
video_function_calls
|