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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2017-09-01 20:44:28 +0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-09-05 13:19:50 +0300
commit76df39fa82645bb0c9cd30bf981d54ab2c332d32 (patch)
tree3b10f588e5de124abdf33b0ab631210f9dd006ae /Documentation/media
parent883dfe8ae6c7dfe4b97151094459b8a32665a168 (diff)
downloadlinux-76df39fa82645bb0c9cd30bf981d54ab2c332d32.tar.xz
media: dmx-get-pes-pids.rst: document the ioctl
This ioctl is supported by the DVB core, but was never documented. Add a documentation for it. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/media')
-rw-r--r--Documentation/media/uapi/dvb/dmx-get-pes-pids.rst22
1 files changed, 20 insertions, 2 deletions
diff --git a/Documentation/media/uapi/dvb/dmx-get-pes-pids.rst b/Documentation/media/uapi/dvb/dmx-get-pes-pids.rst
index 20288c11d279..fbdbc12869d1 100644
--- a/Documentation/media/uapi/dvb/dmx-get-pes-pids.rst
+++ b/Documentation/media/uapi/dvb/dmx-get-pes-pids.rst
@@ -25,13 +25,31 @@ Arguments
File descriptor returned by :c:func:`open() <dvb-dmx-open>`.
``pids``
- Undocumented.
+ Array used to store 5 Program IDs.
Description
-----------
-.. note:: This ioctl is undocumented. Documentation is welcome.
+This ioctl allows to query a DVB device to return the first PID used
+by audio, video, textext, subtitle and PCR programs on a given service.
+They're stored as:
+
+======================= ======== =======================================
+PID element position content
+======================= ======== =======================================
+pids[DMX_PES_AUDIO] 0 first audio PID
+pids[DMX_PES_VIDEO] 1 first video PID
+pids[DMX_PES_TELETEXT] 2 first teletext PID
+pids[DMX_PES_SUBTITLE] 3 first subtitle PID
+pids[DMX_PES_PCR] 4 first Program Clock Reference PID
+======================= ======== =======================================
+
+
+.. note::
+
+ A value equal to 0xffff means that the PID was not filled by the
+ Kernel.
Return Value