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diff --git a/Documentation/media/uapi/dvb/video.rst b/Documentation/media/uapi/dvb/video.rst new file mode 100644 index 000000000..e7d68cd0c --- /dev/null +++ b/Documentation/media/uapi/dvb/video.rst @@ -0,0 +1,36 @@ +.. -*- 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 |