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Diffstat (limited to 'Documentation/userspace-api/media/v4l/dev-output.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/dev-output.rst | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/Documentation/userspace-api/media/v4l/dev-output.rst b/Documentation/userspace-api/media/v4l/dev-output.rst index 2315faf61aaf..eadcb4aa813b 100644 --- a/Documentation/userspace-api/media/v4l/dev-output.rst +++ b/Documentation/userspace-api/media/v4l/dev-output.rst @@ -1,4 +1,5 @@ .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L .. _output: @@ -18,7 +19,6 @@ device. .. note:: The same device file names are used also for video capture devices. - Querying Capabilities ===================== @@ -32,7 +32,6 @@ functions they may also support the :ref:`raw VBI output <raw-vbi>` streaming I/O methods must be supported. Modulators and audio outputs are optional. - Supplemental Functions ====================== @@ -43,7 +42,6 @@ Video output devices shall support :ref:`audio output <audio>`, :ref:`video output <video>` ioctls must be supported by all video output devices. - Image Format Negotiation ======================== @@ -53,7 +51,7 @@ 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 writing to it as if it was a plain file. Well written V4L2 applications ensure they really get what they want, including cropping and scaling. @@ -92,7 +90,6 @@ 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. - Writing Images ============== |