diff options
Diffstat (limited to 'Documentation/userspace-api/media/v4l/dev-capture.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/dev-capture.rst | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/Documentation/userspace-api/media/v4l/dev-capture.rst b/Documentation/userspace-api/media/v4l/dev-capture.rst index 5ea1ffe71fa6..fe58fd450e2f 100644 --- a/Documentation/userspace-api/media/v4l/dev-capture.rst +++ b/Documentation/userspace-api/media/v4l/dev-capture.rst @@ -1,4 +1,5 @@ .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L .. _capture: @@ -19,7 +20,6 @@ device. .. note:: The same device file names are used for video output devices. - Querying Capabilities ===================== @@ -34,7 +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 ====================== @@ -45,7 +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 ======================== @@ -55,7 +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. @@ -95,7 +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 ============== |