18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci.. _dvb_video: 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci####################### 68c2ecf20Sopenharmony_ciDigital TV Video Device 78c2ecf20Sopenharmony_ci####################### 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ciThe Digital TV video device controls the MPEG2 video decoder of the Digital 108c2ecf20Sopenharmony_ciTV hardware. It can be accessed through **/dev/dvb/adapter0/video0**. Data 118c2ecf20Sopenharmony_citypes and and ioctl definitions can be accessed by including 128c2ecf20Sopenharmony_ci**linux/dvb/video.h** in your application. 138c2ecf20Sopenharmony_ci 148c2ecf20Sopenharmony_ciNote that the Digital TV video device only controls decoding of the MPEG video 158c2ecf20Sopenharmony_cistream, not its presentation on the TV or computer screen. On PCs this 168c2ecf20Sopenharmony_ciis typically handled by an associated video4linux device, e.g. 178c2ecf20Sopenharmony_ci**/dev/video**, which allows scaling and defining output windows. 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ciSome Digital TV cards don’t have their own MPEG decoder, which results in the 208c2ecf20Sopenharmony_ciomission of the audio and video device as well as the video4linux 218c2ecf20Sopenharmony_cidevice. 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ciThe ioctls that deal with SPUs (sub picture units) and navigation 248c2ecf20Sopenharmony_cipackets are only supported on some MPEG decoders made for DVD playback. 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ciThese ioctls were also used by V4L2 to control MPEG decoders implemented 278c2ecf20Sopenharmony_ciin V4L2. The use of these ioctls for that purpose has been made obsolete 288c2ecf20Sopenharmony_ciand proper V4L2 ioctls or controls have been created to replace that 298c2ecf20Sopenharmony_cifunctionality. 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci.. toctree:: 338c2ecf20Sopenharmony_ci :maxdepth: 1 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci video_types 368c2ecf20Sopenharmony_ci video_function_calls 37