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[media] vivid.txt: update the vivid documentation

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Document the new Transfer Function control (and fix the documentation for
the other colorspace controls which were not quite correct).

Mention the support for 4:2:0 and more multiplanar formats.

Update the TODO list at the end.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-05-31 08:10:32 -03:00 committed by Mauro Carvalho Chehab
parent e1dedcfff1
commit 64d5702229
1 changed files with 18 additions and 12 deletions
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30
Documentation/video4linux/vivid.txt
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@ -631,26 +631,33 @@ Timestamp Source: selects when the timestamp for each buffer is taken.
Colorspace: selects which colorspace should be used when generating the image.
This only applies if the CSC Colorbar test pattern is selected,
otherwise the test pattern will go through unconverted (except for
the so-called 'Transfer Function' corrections and the R'G'B' to Y'CbCr
conversion). This behavior is also what you want, since a 75% Colorbar
otherwise the test pattern will go through unconverted.
This behavior is also what you want, since a 75% Colorbar
should really have 75% signal intensity and should not be affected
by colorspace conversions.
Changing the colorspace will result in the V4L2_EVENT_SOURCE_CHANGE
to be sent since it emulates a detected colorspace change.
Transfer Function: selects which colorspace transfer function should be used when
generating an image. This only applies if the CSC Colorbar test pattern is
selected, otherwise the test pattern will go through unconverted.
This behavior is also what you want, since a 75% Colorbar
should really have 75% signal intensity and should not be affected
by colorspace conversions.
Changing the transfer function will result in the V4L2_EVENT_SOURCE_CHANGE
to be sent since it emulates a detected colorspace change.
Y'CbCr Encoding: selects which Y'CbCr encoding should be used when generating
a Y'CbCr image. This only applies if the CSC Colorbar test pattern is
selected, and if the format is set to a Y'CbCr format as opposed to an
RGB format.
a Y'CbCr image. This only applies if the format is set to a Y'CbCr format
as opposed to an RGB format.
Changing the Y'CbCr encoding will result in the V4L2_EVENT_SOURCE_CHANGE
to be sent since it emulates a detected colorspace change.
Quantization: selects which quantization should be used for the RGB or Y'CbCr
encoding when generating the test pattern. This only applies if the CSC
Colorbar test pattern is selected.
encoding when generating the test pattern.
Changing the quantization will result in the V4L2_EVENT_SOURCE_CHANGE
to be sent since it emulates a detected colorspace change.
@ -985,8 +992,9 @@ to change crop and compose rectangles on the fly.
Section 12: Formats
-------------------
The driver supports all the regular packed YUYV formats, 16, 24 and 32 RGB
packed formats and two multiplanar formats (one luma and one chroma plane).
The driver supports all the regular packed and planar 4:4:4, 4:2:2 and 4:2:0
YUYV formats, 8, 16, 24 and 32 RGB packed formats and various multiplanar
formats.
The alpha component can be set through the 'Alpha Component' User control
for those formats that support it. If the 'Apply Alpha To Red Only' control
@ -1119,11 +1127,9 @@ Just as a reminder and in no particular order:
- Use per-queue locks and/or per-device locks to improve throughput
- Add support to loop from a specific output to a specific input across
vivid instances
- Add support for VIDIOC_EXPBUF once support for that has been added to vb2
- The SDR radio should use the same 'frequencies' for stations as the normal
radio receiver, and give back noise if the frequency doesn't match up with
a station frequency
- Improve the sine generation of the SDR radio.
- Make a thread for the RDS generation, that would help in particular for the
"Controls" RDS Rx I/O Mode as the read-only RDS controls could be updated
in real-time.