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doc: media: visl: Document tpg_verbose parameter

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Also document stable frames and what it means for testing tools.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: add media: prefix to Subject]
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Detlev Casanova 2024-01-17 10:10:17 -05:00 committed by Hans Verkuil
parent 8901f20bf7
commit ce7e79acb6
1 changed files with 10 additions and 2 deletions
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12
Documentation/admin-guide/media/visl.rst
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@ -49,6 +49,10 @@ Module parameters
visl_dprintk_frame_start, visl_dprintk_nframes, but controls the dumping of
buffer data through debugfs instead.
- tpg_verbose: Write extra information on each output frame to ease debugging
the API. When set to true, the output frames are not stable for a given input
as some information like pointers or queue status will be added to them.
What is the default use case for this driver?
---------------------------------------------
@ -57,8 +61,12 @@ This assumes that a working client is run against visl and that the ftrace and
OUTPUT buffer data is subsequently used to debug a work-in-progress
implementation.
Information on reference frames, their timestamps, the status of the OUTPUT and
CAPTURE queues and more can be read directly from the CAPTURE buffers.
Even though no video decoding is actually done, the output frames can be used
against a reference for a given input, except if tpg_verbose is set to true.
Depending on the tpg_verbose parameter value, information on reference frames,
their timestamps, the status of the OUTPUT and CAPTURE queues and more can be
read directly from the CAPTURE buffers.
Supported codecs
----------------