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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-03 20:59:38 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-03 20:59:38 -0700 |
commit | a98f670e41a99f53acb1fb33cee9c6abbb2e6f23 (patch) | |
tree | f8ae10a4cb91758ad7f9422053753a8c5d0f04dc /Documentation/media/uapi/v4l/streaming-par.rst | |
parent | ee01c4d72adffb7d424535adf630f2955748fa8b (diff) | |
parent | 938b29db3aa9c293c7c1366b16e55e308f1a1ddd (diff) | |
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Merge tag 'media/v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- Media documentation is now split into admin-guide, driver-api and
userspace-api books (a longstanding request from Jon);
- The media Kconfig was reorganized, in order to make easier to select
drivers and their dependencies;
- The testing drivers now has a separate directory;
- added a new driver for Rockchip Video Decoder IP;
- The atomisp staging driver was resurrected. It is meant to work with
4 generations of cameras on Atom-based laptops, tablets and cell
phones. So, it seems worth investing time to cleanup this driver and
making it in good shape.
- Added some V4L2 core ancillary routines to help with h264 codecs;
- Added an ov2740 image sensor driver;
- The si2157 gained support for Analog TV, which, in turn, added
support for some cx231xx and cx23885 boards to also support analog
standards;
- Added some V4L2 controls (V4L2_CID_CAMERA_ORIENTATION and
V4L2_CID_CAMERA_SENSOR_ROTATION) to help identifying where the camera
is located at the device;
- VIDIOC_ENUM_FMT was extended to support MC-centric devices;
- Lots of drivers improvements and cleanups.
* tag 'media/v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (503 commits)
media: Documentation: media: Refer to mbus format documentation from CSI-2 docs
media: s5k5baf: Replace zero-length array with flexible-array
media: i2c: imx219: Drop <linux/clk-provider.h> and <linux/clkdev.h>
media: i2c: Add ov2740 image sensor driver
media: ov8856: Implement sensor module revision identification
media: ov8856: Add devicetree support
media: dt-bindings: ov8856: Document YAML bindings
media: dvb-usb: Add Cinergy S2 PCIe Dual Port support
media: dvbdev: Fix tuner->demod media controller link
media: dt-bindings: phy: phy-rockchip-dphy-rx0: move rockchip dphy rx0 bindings out of staging
media: staging: dt-bindings: phy-rockchip-dphy-rx0: remove non-used reg property
media: atomisp: unify the version for isp2401 a0 and b0 versions
media: atomisp: update TODO with the current data
media: atomisp: adjust some code at sh_css that could be broken
media: atomisp: don't produce errs for ignored IRQs
media: atomisp: print IRQ when debugging
media: atomisp: isp_mmu: don't use kmem_cache
media: atomisp: add a notice about possible leak resources
media: atomisp: disable the dynamic and reserved pools
media: atomisp: turn on camera before setting it
...
Diffstat (limited to 'Documentation/media/uapi/v4l/streaming-par.rst')
-rw-r--r-- | Documentation/media/uapi/v4l/streaming-par.rst | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/Documentation/media/uapi/v4l/streaming-par.rst b/Documentation/media/uapi/v4l/streaming-par.rst deleted file mode 100644 index 425bd0ff1477..000000000000 --- a/Documentation/media/uapi/v4l/streaming-par.rst +++ /dev/null @@ -1,40 +0,0 @@ -.. Permission is granted to copy, distribute and/or modify this -.. document under the terms of the GNU Free Documentation License, -.. Version 1.1 or any later version published by the Free Software -.. Foundation, with no Invariant Sections, no Front-Cover Texts -.. and no Back-Cover Texts. A copy of the license is included at -.. Documentation/media/uapi/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections - -.. _streaming-par: - -******************** -Streaming Parameters -******************** - -Streaming parameters are intended to optimize the video capture process -as well as I/O. Presently applications can request a high quality -capture mode with the :ref:`VIDIOC_S_PARM <VIDIOC_G_PARM>` ioctl. - -The current video standard determines a nominal number of frames per -second. If less than this number of frames is to be captured or output, -applications can request frame skipping or duplicating on the driver -side. This is especially useful when using the -:ref:`read() <func-read>` or :ref:`write() <func-write>`, which are -not augmented by timestamps or sequence counters, and to avoid -unnecessary data copying. - -Finally these ioctls can be used to determine the number of buffers used -internally by a driver in read/write mode. For implications see the -section discussing the :ref:`read() <func-read>` function. - -To get and set the streaming parameters applications call the -:ref:`VIDIOC_G_PARM <VIDIOC_G_PARM>` and -:ref:`VIDIOC_S_PARM <VIDIOC_G_PARM>` ioctl, respectively. They take -a pointer to a struct :c:type:`v4l2_streamparm`, which -contains a union holding separate parameters for input and output -devices. - -These ioctls are optional, drivers need not implement them. If so, they -return the ``EINVAL`` error code. |