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Diffstat (limited to 'Documentation/userspace-api/media/v4l/dev-capture.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/dev-capture.rst | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/Documentation/userspace-api/media/v4l/dev-capture.rst b/Documentation/userspace-api/media/v4l/dev-capture.rst index 44d3094093ab..fe58fd450e2f 100644 --- a/Documentation/userspace-api/media/v4l/dev-capture.rst +++ b/Documentation/userspace-api/media/v4l/dev-capture.rst @@ -1,11 +1,5 @@ -.. 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/userspace-api/media/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L .. _capture: @@ -26,7 +20,6 @@ device. .. note:: The same device file names are used for video output devices. - Querying Capabilities ===================== @@ -41,7 +34,6 @@ functions they may also support the :ref:`video overlay <overlay>` streaming I/O methods must be supported. Tuners and audio inputs are optional. - Supplemental Functions ====================== @@ -52,7 +44,6 @@ Video capture devices shall support :ref:`audio input <audio>`, :ref:`video input <video>` ioctls must be supported by all video capture devices. - Image Format Negotiation ======================== @@ -62,7 +53,7 @@ capture, the latter how images are stored in memory, i. e. in RGB or YUV format, the number of bits per pixel or width and height. Together they also define how images are scaled in the process. -As usual these parameters are *not* reset at :ref:`open() <func-open>` +As usual these parameters are *not* reset at :c:func:`open()` time to permit Unix tool chains, programming a device and then reading from it as if it was a plain file. Well written V4L2 applications ensure they really get what they want, including cropping and scaling. @@ -102,7 +93,6 @@ and :ref:`VIDIOC_S_FMT <VIDIOC_G_FMT>` ioctl, even if :ref:`VIDIOC_S_FMT <VIDIOC requests and always returns default parameters as :ref:`VIDIOC_G_FMT <VIDIOC_G_FMT>` does. :ref:`VIDIOC_TRY_FMT <VIDIOC_G_FMT>` is optional. - Reading Images ============== |