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Subject[PATCH 11/14] media: dmx-get-pes-pids.rst: document the ioctl
Date
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>
---
Documentation/media/uapi/dvb/dmx-get-pes-pids.rst | 22 ++++++++++++++++++++--
1 file 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
--
2.13.5
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