.. -*- coding: utf-8; mode: rst -*-

.. _dvb_video:

################
DVB Video Device
################
The DVB video device controls the MPEG2 video decoder of the DVB
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 DVB 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 DVB 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
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=b3dba77cf0acb6e44b368979026df975658332bc&amp;showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=b3dba77cf0acb6e44b368979026df975658332bc&amp;showmsg=1'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/bridge?id=b3dba77cf0acb6e44b368979026df975658332bc&amp;showmsg=1'>bridge</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/bridge/br_ioctl.c?id=b3dba77cf0acb6e44b368979026df975658332bc&amp;showmsg=1'>br_ioctl.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/bridge/br_ioctl.c?id=b3dba77cf0acb6e44b368979026df975658332bc'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-06 22:53:13 -0500'>2017-02-06</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge/br_ioctl.c?id=f7cdee8a79a1cb03fa9ca71b825e72f880b344e1'>bridge: move to workqueue gc</a></td><td>Nikolay Aleksandrov</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Move the fdb garbage collector to a workqueue which fires at least 10
milliseconds apart and cleans chain by chain allowing for other tasks
to run in the meantime. When having thousands of fdbs the system is much
more responsive. Most importantly remove the need to check if the
matched entry has expired in __br_fdb_get that causes false-sharing and
is completely unnecessary if we cleanup entries, at worst we'll get 10ms
of traffic for that entry before it gets deleted.

Signed-off-by: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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