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media: Documentation:media:v4l-drivers: Update vivid documentation. 

Add metadata capture/output and v4l-touch support in vivid
documentation.

Signed-off-by: Vandana BN <bnvandana@gmail.com>
[hverkuil-cisco@xs4all.nl: fixed some typos, made some small tweaks of the text]
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
alistair/sensors
Vandana BN 2020-02-27 06:39:09 +01:00 committed by Mauro Carvalho Chehab
parent 1b73c0fffb
commit 8bc8c9ba03
1 changed files with 60 additions and 3 deletions
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63
Documentation/media/v4l-drivers/vivid.rst
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@ -4,9 +4,9 @@ The Virtual Video Test Driver (vivid)
=====================================
This driver emulates video4linux hardware of various types: video capture, video
output, vbi capture and output, radio receivers and transmitters and a software
defined radio receiver. In addition a simple framebuffer device is available for
testing capture and output overlays.
output, vbi capture and output, metadata capture and output, radio receivers and
transmitters, touch capture and a software defined radio receiver. In addition a
simple framebuffer device is available for testing capture and output overlays.
Up to 64 vivid instances can be created, each with up to 16 inputs and 16 outputs.
@ -36,6 +36,8 @@ This document describes the features implemented by this driver:
- Radio receiver and transmitter support, including RDS support
- Software defined radio (SDR) support
- Capture and output overlay support
- Metadata capture and output support
- Touch capture support
These features will be described in more detail below.
@ -69,6 +71,9 @@ all configurable using the following module options:
- bit 10-11: VBI Output node: 0 = none, 1 = raw vbi, 2 = sliced vbi, 3 = both
- bit 12: Radio Transmitter node
- bit 16: Framebuffer for testing overlays
- bit 17: Metadata Capture node
- bit 18: Metadata Output node
- bit 19: Touch Capture node
So to create four instances, the first two with just one video capture
device, the second two with just one video output device you would pass
@ -175,6 +180,21 @@ all configurable using the following module options:
give the desired swradioX start number for each SDR capture device.
The default is -1 which will just take the first free number.
- meta_cap_nr:
give the desired videoX start number for each metadata capture device.
The default is -1 which will just take the first free number.
- meta_out_nr:
give the desired videoX start number for each metadata output device.
The default is -1 which will just take the first free number.
- touch_cap_nr:
give the desired v4l-touchX start number for each touch capture device.
The default is -1 which will just take the first free number.
- ccs_cap_mode:
specify the allowed video capture crop/compose/scaling combination
@ -547,6 +567,33 @@ The generated data contains the In-phase and Quadrature components of a
1 kHz tone that has an amplitude of sqrt(2).
Metadata Capture
----------------
The Metadata capture generates UVC format metadata. The PTS and SCR are
transmitted based on the values set in vivid contols.
The Metadata device will only work for the Webcam input, it will give
back an error for all other inputs.
Metadata Output
---------------
The Metadata output can be used to set brightness, contrast, saturation and hue.
The Metadata device will only work for the Webcam output, it will give
back an error for all other outputs.
Touch Capture
-------------
The Touch capture generates touch patterns simulating single tap, double tap,
triple tap, move from left to right, zoom in, zoom out, palm press (simulating
a large area being pressed on a touchpad), and simulating 16 simultaneous
touch points.
Controls
--------
@ -1049,6 +1096,16 @@ FM Radio Modulator Controls
to pass the RDS blocks to the driver, or "Controls" where the RDS data
is Provided by the RDS controls mentioned above.
Metadata Capture Controls
~~~~~~~~~~~~~~~~~~~~~~~~~~
- Generate PTS
if set, then the generated metadata stream contains Presentation timestamp.
- Generate SCR
if set, then the generated metadata stream contains Source Clock information.
Video, VBI and RDS Looping
--------------------------