Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
media: Documentation: Improve grammar, formatting in Video4Linux
Fix typos, punctuation and improve grammar and formatting in documentation
for Video4Linux (V4L).
Signed-off-by: Hanne-Lotta Mäenpää <hannelotta@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
authored by
Hanne-Lotta Mäenpää
and committed by
Hans Verkuil
23715176
dd8bb4a2
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Documentation/userspace-api/media/v4l/biblio.rst
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Documentation/userspace-api/media/v4l/biblio.rst
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========
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:title: ITU-T Recommendation T.81 "Information Technology --- Digital Compression and Coding of Continous-Tone Still Images --- Requirements and Guidelines"
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:title: ITU-T Recommendation T.81 "Information Technology --- Digital Compression and Coding of Continuous-Tone Still Images --- Requirements and Guidelines"
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:author: International Telecommunication Union (http://www.itu.int)
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Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst
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Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst
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The :ref:`video standard <standard>` ioctls provide information vital
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to program a sliced VBI device, therefore must be supported.
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.. _sliced-vbi-format-negotitation:
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.. _sliced-vbi-format-negotiation:
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Sliced VBI Format Negotiation
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=============================
···
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If a device can produce an MPEG output stream, it may be capable of
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providing
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:ref:`negotiated sliced VBI services <sliced-vbi-format-negotitation>`
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:ref:`negotiated sliced VBI services <sliced-vbi-format-negotiation>`
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as data embedded in the MPEG stream. Users or applications control this
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sliced VBI data insertion with the
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:ref:`V4L2_CID_MPEG_STREAM_VBI_FMT <v4l2-mpeg-stream-vbi-fmt>`
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Documentation/userspace-api/media/v4l/ext-ctrls-fm-rx.rst
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Documentation/userspace-api/media/v4l/ext-ctrls-fm-rx.rst
···
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broadcasts speech. If the transmitter doesn't make this distinction,
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then it will be set.
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``V4L2_CID_TUNE_DEEMPHASIS``
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(enum)
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enum v4l2_deemphasis -
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``V4L2_CID_TUNE_DEEMPHASIS (enum)``
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Configures the de-emphasis value for reception. A de-emphasis filter
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is applied to the broadcast to accentuate the high audio
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frequencies. Depending on the region, a time constant of either 50
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or 75 useconds is used. The enum v4l2_deemphasis defines possible
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values for de-emphasis. Here they are:
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-
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or 75 microseconds is used. The enum v4l2_deemphasis defines possible
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values for de-emphasis. They are:
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.. flat-table::
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:header-rows: 0
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Documentation/userspace-api/media/v4l/ext-ctrls-fm-tx.rst
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Documentation/userspace-api/media/v4l/ext-ctrls-fm-tx.rst
···
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``V4L2_CID_AUDIO_LIMITER_RELEASE_TIME (integer)``
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Sets the audio deviation limiter feature release time. Unit is in
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useconds. Step and range are driver-specific.
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microseconds. Step and range are driver-specific.
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``V4L2_CID_AUDIO_LIMITER_DEVIATION (integer)``
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Configures audio frequency deviation level in Hz. The range and step
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range and step are driver-specific.
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``V4L2_CID_AUDIO_COMPRESSION_THRESHOLD (integer)``
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Sets the threshold level for audio compression freature. It is a dB
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Sets the threshold level for audio compression feature. It is a dB
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value. The range and step are driver-specific.
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``V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME (integer)``
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Sets the attack time for audio compression feature. It is a useconds
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Sets the attack time for audio compression feature. It is a microseconds
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value. The range and step are driver-specific.
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``V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME (integer)``
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Sets the release time for audio compression feature. It is a
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useconds value. The range and step are driver-specific.
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microseconds value. The range and step are driver-specific.
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``V4L2_CID_PILOT_TONE_ENABLED (boolean)``
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Enables or disables the pilot tone generation feature.
···
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Configures pilot tone frequency value. Unit is in Hz. The range and
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step are driver-specific.
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``V4L2_CID_TUNE_PREEMPHASIS``
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(enum)
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enum v4l2_preemphasis -
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``V4L2_CID_TUNE_PREEMPHASIS (enum)``
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Configures the pre-emphasis value for broadcasting. A pre-emphasis
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filter is applied to the broadcast to accentuate the high audio
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frequencies. Depending on the region, a time constant of either 50
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or 75 useconds is used. The enum v4l2_preemphasis defines possible
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values for pre-emphasis. Here they are:
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-
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or 75 microseconds is used. The enum v4l2_preemphasis defines possible
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values for pre-emphasis. They are:
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.. flat-table::
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:header-rows: 0
···
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- A pre-emphasis of 50 uS is used.
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* - ``V4L2_PREEMPHASIS_75_uS``
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- A pre-emphasis of 75 uS is used.
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``V4L2_CID_TUNE_POWER_LEVEL (integer)``
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Sets the output power level for signal transmission. Unit is in
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Documentation/userspace-api/media/v4l/pixfmt-srggb12p.rst
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.. _v4l2-pix-fmt-sgrbg12p:
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*******************************************************************************************************************************
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V4L2_PIX_FMT_SRGGB12P ('pRCC'), V4L2_PIX_FMT_SGRBG12P ('pgCC'), V4L2_PIX_FMT_SGBRG12P ('pGCC'), V4L2_PIX_FMT_SBGGR12P ('pBCC'),
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V4L2_PIX_FMT_SRGGB12P ('pRCC'), V4L2_PIX_FMT_SGRBG12P ('pgCC'), V4L2_PIX_FMT_SGBRG12P ('pGCC'), V4L2_PIX_FMT_SBGGR12P ('pBCC')
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*******************************************************************************************************************************
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···
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These four pixel formats are packed raw sRGB / Bayer formats with 12
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bits per colour. Every two consecutive samples are packed into three
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bytes. Each of the first two bytes contain the 8 high order bits of
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the pixels, and the third byte contains the four least significants
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the pixels, and the third byte contains the four least significant
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bits of each pixel, in the same order.
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Each n-pixel row contains n/2 green samples and n/2 blue or red
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Documentation/userspace-api/media/v4l/pixfmt-srggb14p.rst
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···
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bits per colour. Every four consecutive samples are packed into seven
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bytes. Each of the first four bytes contain the eight high order bits
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of the pixels, and the three following bytes contains the six least
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significants bits of each pixel, in the same order.
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significant bits of each pixel, in the same order.
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Each n-pixel row contains n/2 green samples and n/2 blue or red samples,
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with alternating green-red and green-blue rows. They are conventionally