:c:type:`struct video_standard` and the color subcarrier fields were
renamed. The :ref:`VIDIOC_QUERYSTD` ioctl was
renamed to :ref:`VIDIOC_ENUMSTD`,
-:ref:`VIDIOC_G_INPUT` to
+:ref:`VIDIOC_G_INPUT <VIDIOC_G_INPUT>` to
:ref:`VIDIOC_ENUMINPUT`. A first draft of the
Codec API was released.
1998-11-14: ``V4L2_PIX_FMT_RGB24`` changed to ``V4L2_PIX_FMT_BGR24``,
and ``V4L2_PIX_FMT_RGB32`` changed to ``V4L2_PIX_FMT_BGR32``. Audio
controls are now accessible with the
-:ref:`VIDIOC_G_CTRL` and
+:ref:`VIDIOC_G_CTRL <VIDIOC_G_CTRL>` and
:ref:`VIDIOC_S_CTRL <VIDIOC_G_CTRL>` ioctls under names starting
with ``V4L2_CID_AUDIO``. The ``V4L2_MAJOR`` define was removed from
``videodev.h`` since it was only used once in the ``videodev`` kernel
int a = V4L2_XXX; err = ioctl(fd, VIDIOC_XXX, &a);
4. All the different get- and set-format commands were swept into one
- :ref:`VIDIOC_G_FMT` and
+ :ref:`VIDIOC_G_FMT <VIDIOC_G_FMT>` and
:ref:`VIDIOC_S_FMT <VIDIOC_G_FMT>` ioctl taking a union and a
type field selecting the union member as parameter. Purpose is to
simplify the API by eliminating several ioctls and to allow new and
2001-04-13: Big endian 16-bit RGB formats were added.
2001-09-17: New YUV formats and the
-:ref:`VIDIOC_G_FREQUENCY` and
+:ref:`VIDIOC_G_FREQUENCY <VIDIOC_G_FREQUENCY>` and
:ref:`VIDIOC_S_FREQUENCY <VIDIOC_G_FREQUENCY>` ioctls were added.
(The old ``VIDIOC_G_FREQ`` and ``VIDIOC_S_FREQ`` ioctls did not take
multiple tuners into account.)
2000-09-18: ``V4L2_BUF_TYPE_VBI`` was added. This may *break
-compatibility* as the :ref:`VIDIOC_G_FMT` and
+compatibility* as the :ref:`VIDIOC_G_FMT <VIDIOC_G_FMT>` and
:ref:`VIDIOC_S_FMT <VIDIOC_G_FMT>` ioctls may fail now if the struct
:c:type:`struct v4l2_fmt` ``type`` field does not contain
``V4L2_BUF_TYPE_VBI``. In the documentation of the struct
supported standards with an ioctl applications can now refer to
standards by :ref:`v4l2_std_id <v4l2-std-id>` and symbols
defined in the ``videodev2.h`` header file. For details see
- :ref:`standard`. The :ref:`VIDIOC_G_STD` and
+ :ref:`standard`. The :ref:`VIDIOC_G_STD <VIDIOC_G_STD>` and
:ref:`VIDIOC_S_STD <VIDIOC_G_STD>` now take a pointer to this
type as argument. :ref:`VIDIOC_QUERYSTD` was
added to autodetect the received standard, if the hardware has this
3. The audio input and output interface was found to be incomplete.
- Previously the :ref:`VIDIOC_G_AUDIO` ioctl would
+ Previously the :ref:`VIDIOC_G_AUDIO <VIDIOC_G_AUDIO>` ioctl would
enumerate the available audio inputs. An ioctl to determine the
current audio input, if more than one combines with the current video
input, did not exist. So ``VIDIOC_G_AUDIO`` was renamed to
``VIDIOC_G_AUDIO_OLD``, this ioctl was removed on Kernel 2.6.39. The
:ref:`VIDIOC_ENUMAUDIO` ioctl was added to
enumerate audio inputs, while
- :ref:`VIDIOC_G_AUDIO` now reports the current
+ :ref:`VIDIOC_G_AUDIO <VIDIOC_G_AUDIO>` now reports the current
audio input.
The same changes were made to
2. A new ``V4L2_TUNER_MODE_LANG1_LANG2`` was defined to record both
languages of a bilingual program. The use of
``V4L2_TUNER_MODE_STEREO`` for this purpose is deprecated now. See
- the :ref:`VIDIOC_G_TUNER` section for details.
+ the :ref:`VIDIOC_G_TUNER <VIDIOC_G_TUNER>` section for details.
V4L2 spec erratum 2006-09-23 (Draft 0.15)
``V4L2_BUF_TYPE_SLICED_VBI_OUTPUT`` of the sliced VBI interface were
not mentioned along with other buffer types.
-2. In :ref:`VIDIOC_G_AUDIO` it was clarified that the struct
+2. In :ref:`VIDIOC_G_AUDIO <VIDIOC_G_AUDIO>` it was clarified that the struct
:ref:`v4l2_audio <v4l2-audio>` ``mode`` field is a flags field.
3. :ref:`VIDIOC_QUERYCAP` did not mention the sliced VBI and radio
capability flags.
-4. In :ref:`VIDIOC_G_FREQUENCY` it was clarified that applications
+4. In :ref:`VIDIOC_G_FREQUENCY <VIDIOC_G_FREQUENCY>` it was clarified that applications
must initialize the tuner ``type`` field of struct
:ref:`v4l2_frequency <v4l2-frequency>` before calling
:ref:`VIDIOC_S_FREQUENCY <VIDIOC_G_FREQUENCY>`.
V4L2 in Linux 2.6.18
====================
-1. New ioctls :ref:`VIDIOC_G_EXT_CTRLS`,
+1. New ioctls :ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>`,
:ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` and
:ref:`VIDIOC_TRY_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` were added, a
flag to skip unsupported controls with
buffer type field was added replacing a reserved field. Note on
architectures where the size of enum types differs from int types the
size of the structure changed. The
- :ref:`VIDIOC_G_SLICED_VBI_CAP` ioctl
+ :ref:`VIDIOC_G_SLICED_VBI_CAP <VIDIOC_G_SLICED_VBI_CAP>` ioctl
was redefined from being read-only to write-read. Applications must
initialize the type field and clear the reserved fields now. These
changes may *break the compatibility* with older drivers and
2. Three new clipping/blending methods with a global or straight or
inverted local alpha value were added to the video overlay interface.
- See the description of the :ref:`VIDIOC_G_FBUF`
+ See the description of the :ref:`VIDIOC_G_FBUF <VIDIOC_G_FBUF>`
and :ref:`VIDIOC_S_FBUF <VIDIOC_G_FBUF>` ioctls for details.
A new ``global_alpha`` field was added to
projects / deliverable / linux.git / blobdiff