diff --git a/Documentation/linux_tv/media/v4l/app-pri.rst b/Documentation/linux_tv/media/v4l/app-pri.rst index 4faf9042f612..7ff6f44eb591 100644 --- a/Documentation/linux_tv/media/v4l/app-pri.rst +++ b/Documentation/linux_tv/media/v4l/app-pri.rst @@ -16,7 +16,7 @@ applications and automatically regain control of the device at a later time. Since these features cannot be implemented entirely in user space V4L2 -defines the :ref:`VIDIOC_G_PRIORITY` and +defines the :ref:`VIDIOC_G_PRIORITY ` and :ref:`VIDIOC_S_PRIORITY ` ioctls to request and query the access priority associate with a file descriptor. Opening a device assigns a medium priority, compatible with earlier versions of diff --git a/Documentation/linux_tv/media/v4l/audio.rst b/Documentation/linux_tv/media/v4l/audio.rst index 21db1b97b83c..8c3314218f75 100644 --- a/Documentation/linux_tv/media/v4l/audio.rst +++ b/Documentation/linux_tv/media/v4l/audio.rst @@ -33,11 +33,11 @@ The struct :ref:`v4l2_audio ` returned by the :ref:`VIDIOC_ENUMAUDIO` ioctl also contains signal :status information applicable when the current audio input is queried. -The :ref:`VIDIOC_G_AUDIO` and +The :ref:`VIDIOC_G_AUDIO ` and :ref:`VIDIOC_G_AUDOUT ` ioctls report the current audio input and output, respectively. Note that, unlike -:ref:`VIDIOC_G_INPUT` and -:ref:`VIDIOC_G_OUTPUT` these ioctls return a +:ref:`VIDIOC_G_INPUT ` and +:ref:`VIDIOC_G_OUTPUT ` these ioctls return a structure as :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` do, not just an index. diff --git a/Documentation/linux_tv/media/v4l/control.rst b/Documentation/linux_tv/media/v4l/control.rst index 02bd455a2616..d6df648767c5 100644 --- a/Documentation/linux_tv/media/v4l/control.rst +++ b/Documentation/linux_tv/media/v4l/control.rst @@ -364,7 +364,7 @@ Control IDs Applications can enumerate the available controls with the :ref:`VIDIOC_QUERYCTRL` and :ref:`VIDIOC_QUERYMENU ` ioctls, get and set a -control value with the :ref:`VIDIOC_G_CTRL` and +control value with the :ref:`VIDIOC_G_CTRL ` and :ref:`VIDIOC_S_CTRL ` ioctls. Drivers must implement ``VIDIOC_QUERYCTRL``, ``VIDIOC_G_CTRL`` and ``VIDIOC_S_CTRL`` when the device has one or more controls, ``VIDIOC_QUERYMENU`` when it has one or diff --git a/Documentation/linux_tv/media/v4l/crop.rst b/Documentation/linux_tv/media/v4l/crop.rst index 41a5efaaa679..bfb30568df23 100644 --- a/Documentation/linux_tv/media/v4l/crop.rst +++ b/Documentation/linux_tv/media/v4l/crop.rst @@ -15,7 +15,7 @@ offset into a video signal. Applications can use the following API to select an area in the video signal, query the default area and the hardware limits. *Despite their name, the :ref:`VIDIOC_CROPCAP`, -:ref:`VIDIOC_G_CROP` and +:ref:`VIDIOC_G_CROP ` and :ref:`VIDIOC_S_CROP ` ioctls apply to input as well as output devices.* @@ -23,7 +23,7 @@ Scaling requires a source and a target. On a video capture or overlay device the source is the video signal, and the cropping ioctls determine the area actually sampled. The target are images read by the application or overlaid onto the graphics screen. Their size (and position for an -overlay) is negotiated with the :ref:`VIDIOC_G_FMT` +overlay) is negotiated with the :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctls. On a video output device the source are the images passed in by the diff --git a/Documentation/linux_tv/media/v4l/dev-capture.rst b/Documentation/linux_tv/media/v4l/dev-capture.rst index c970a1fd1439..0e62dc026251 100644 --- a/Documentation/linux_tv/media/v4l/dev-capture.rst +++ b/Documentation/linux_tv/media/v4l/dev-capture.rst @@ -65,7 +65,7 @@ To query the current image format applications set the ``type`` field of a struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_CAPTURE`` or ``V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE`` and call the -:ref:`VIDIOC_G_FMT` ioctl with a pointer to this +:ref:`VIDIOC_G_FMT ` ioctl with a pointer to this structure. Drivers fill the struct :ref:`v4l2_pix_format ` ``pix`` or the struct :ref:`v4l2_pix_format_mplane ` ``pix_mp`` @@ -75,9 +75,9 @@ To request different parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` as above and initialize all fields of the struct :ref:`v4l2_pix_format ` ``vbi`` member of the ``fmt`` union, or better just modify the results -of :ref:`VIDIOC_G_FMT`, and call the :ref:`VIDIOC_S_FMT ` +of :ref:`VIDIOC_G_FMT `, and call the :ref:`VIDIOC_S_FMT ` ioctl with a pointer to this structure. Drivers may adjust the -parameters and finally return the actual parameters as :ref:`VIDIOC_G_FMT` +parameters and finally return the actual parameters as :ref:`VIDIOC_G_FMT ` does. Like :ref:`VIDIOC_S_FMT ` the :ref:`VIDIOC_TRY_FMT ` ioctl @@ -87,10 +87,10 @@ possibly time consuming hardware preparations. The contents of struct :ref:`v4l2_pix_format ` and struct :ref:`v4l2_pix_format_mplane ` are discussed in :ref:`pixfmt`. See also the specification of the -:ref:`VIDIOC_G_FMT`, :ref:`VIDIOC_S_FMT ` and :ref:`VIDIOC_TRY_FMT ` ioctls for -details. Video capture devices must implement both the :ref:`VIDIOC_G_FMT` +:ref:`VIDIOC_G_FMT `, :ref:`VIDIOC_S_FMT ` and :ref:`VIDIOC_TRY_FMT ` ioctls for +details. Video capture devices must implement both the :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctl, even if :ref:`VIDIOC_S_FMT ` ignores all -requests and always returns default parameters as :ref:`VIDIOC_G_FMT` does. +requests and always returns default parameters as :ref:`VIDIOC_G_FMT ` does. :ref:`VIDIOC_TRY_FMT ` is optional. diff --git a/Documentation/linux_tv/media/v4l/dev-osd.rst b/Documentation/linux_tv/media/v4l/dev-osd.rst index 4b668a3544b8..f9337001f50d 100644 --- a/Documentation/linux_tv/media/v4l/dev-osd.rst +++ b/Documentation/linux_tv/media/v4l/dev-osd.rst @@ -36,7 +36,7 @@ Contrary to the *Video Overlay* interface the framebuffer is normally implemented on the TV card and not the graphics card. On Linux it is accessible as a framebuffer device (``/dev/fbN``). Given a V4L2 device, applications can find the corresponding framebuffer device by calling -the :ref:`VIDIOC_G_FBUF` ioctl. It returns, amongst +the :ref:`VIDIOC_G_FBUF ` ioctl. It returns, amongst other information, the physical address of the framebuffer in the ``base`` field of struct :ref:`v4l2_framebuffer `. The framebuffer device ioctl ``FBIOGET_FSCREENINFO`` returns the same @@ -115,7 +115,7 @@ clipping/blending method to be used for the overlay. To get the current parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY`` and call the -:ref:`VIDIOC_G_FMT` ioctl. The driver fills the +:ref:`VIDIOC_G_FMT ` ioctl. The driver fills the :c:type:`struct v4l2_window` substructure named ``win``. It is not possible to retrieve a previously programmed clipping list or bitmap. @@ -124,7 +124,7 @@ struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY``, initialize the ``win`` substructure and call the :ref:`VIDIOC_S_FMT ` ioctl. The driver adjusts the parameters against hardware limits and returns -the actual parameters as :ref:`VIDIOC_G_FMT` does. Like :ref:`VIDIOC_S_FMT `, +the actual parameters as :ref:`VIDIOC_G_FMT ` does. Like :ref:`VIDIOC_S_FMT `, the :ref:`VIDIOC_TRY_FMT ` ioctl can be used to learn about driver capabilities without actually changing driver state. Unlike :ref:`VIDIOC_S_FMT ` this also works after the overlay has been enabled. diff --git a/Documentation/linux_tv/media/v4l/dev-output.rst b/Documentation/linux_tv/media/v4l/dev-output.rst index ee62d1a0fb87..5253498db95a 100644 --- a/Documentation/linux_tv/media/v4l/dev-output.rst +++ b/Documentation/linux_tv/media/v4l/dev-output.rst @@ -62,7 +62,7 @@ defaults. An example is given in :ref:`crop`. To query the current image format applications set the ``type`` field of a struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_OUTPUT`` or ``V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE`` -and call the :ref:`VIDIOC_G_FMT` ioctl with a pointer +and call the :ref:`VIDIOC_G_FMT ` ioctl with a pointer to this structure. Drivers fill the struct :ref:`v4l2_pix_format ` ``pix`` or the struct :ref:`v4l2_pix_format_mplane ` ``pix_mp`` @@ -72,9 +72,9 @@ To request different parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` as above and initialize all fields of the struct :ref:`v4l2_pix_format ` ``vbi`` member of the ``fmt`` union, or better just modify the results -of :ref:`VIDIOC_G_FMT`, and call the :ref:`VIDIOC_S_FMT ` +of :ref:`VIDIOC_G_FMT `, and call the :ref:`VIDIOC_S_FMT ` ioctl with a pointer to this structure. Drivers may adjust the -parameters and finally return the actual parameters as :ref:`VIDIOC_G_FMT` +parameters and finally return the actual parameters as :ref:`VIDIOC_G_FMT ` does. Like :ref:`VIDIOC_S_FMT ` the :ref:`VIDIOC_TRY_FMT ` ioctl @@ -84,10 +84,10 @@ possibly time consuming hardware preparations. The contents of struct :ref:`v4l2_pix_format ` and struct :ref:`v4l2_pix_format_mplane ` are discussed in :ref:`pixfmt`. See also the specification of the -:ref:`VIDIOC_G_FMT`, :ref:`VIDIOC_S_FMT ` and :ref:`VIDIOC_TRY_FMT ` ioctls for -details. Video output devices must implement both the :ref:`VIDIOC_G_FMT` +:ref:`VIDIOC_G_FMT `, :ref:`VIDIOC_S_FMT ` and :ref:`VIDIOC_TRY_FMT ` ioctls for +details. Video output devices must implement both the :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctl, even if :ref:`VIDIOC_S_FMT ` ignores all -requests and always returns default parameters as :ref:`VIDIOC_G_FMT` does. +requests and always returns default parameters as :ref:`VIDIOC_G_FMT ` does. :ref:`VIDIOC_TRY_FMT ` is optional. diff --git a/Documentation/linux_tv/media/v4l/dev-overlay.rst b/Documentation/linux_tv/media/v4l/dev-overlay.rst index 26bd4a15a125..083cf07e55c5 100644 --- a/Documentation/linux_tv/media/v4l/dev-overlay.rst +++ b/Documentation/linux_tv/media/v4l/dev-overlay.rst @@ -63,7 +63,7 @@ Setup Before overlay can commence applications must program the driver with frame buffer parameters, namely the address and size of the frame buffer and the image format, for example RGB 5:6:5. The -:ref:`VIDIOC_G_FBUF` and +:ref:`VIDIOC_G_FBUF ` and :ref:`VIDIOC_S_FBUF ` ioctls are available to get and set these parameters, respectively. The :ref:`VIDIOC_S_FBUF ` ioctl is privileged because it allows to set up DMA into physical memory, @@ -77,7 +77,7 @@ Some devices add the video overlay to the output signal of the graphics card. In this case the frame buffer is not modified by the video device, and the frame buffer address and pixel format are not needed by the driver. The :ref:`VIDIOC_S_FBUF ` ioctl is not privileged. An application -can check for this type of device by calling the :ref:`VIDIOC_G_FBUF` +can check for this type of device by calling the :ref:`VIDIOC_G_FBUF ` ioctl. A driver may support any (or none) of five clipping/blending methods: @@ -121,7 +121,7 @@ its position over the graphics surface and the clipping to be applied. To get the current parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_OVERLAY`` and call the -:ref:`VIDIOC_G_FMT` ioctl. The driver fills the +:ref:`VIDIOC_G_FMT ` ioctl. The driver fills the :c:type:`struct v4l2_window` substructure named ``win``. It is not possible to retrieve a previously programmed clipping list or bitmap. @@ -130,7 +130,7 @@ struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VIDEO_OVERLAY``, initialize the ``win`` substructure and call the :ref:`VIDIOC_S_FMT ` ioctl. The driver adjusts the parameters against hardware limits and returns the actual -parameters as :ref:`VIDIOC_G_FMT` does. Like :ref:`VIDIOC_S_FMT `, the +parameters as :ref:`VIDIOC_G_FMT ` does. Like :ref:`VIDIOC_S_FMT `, the :ref:`VIDIOC_TRY_FMT ` ioctl can be used to learn about driver capabilities without actually changing driver state. Unlike :ref:`VIDIOC_S_FMT ` this also works after the overlay has been enabled. @@ -179,7 +179,7 @@ struct v4l2_window ``struct v4l2_clip * clips`` When chroma-keying has *not* been negotiated and - :ref:`VIDIOC_G_FBUF` indicated this capability, + :ref:`VIDIOC_G_FBUF ` indicated this capability, applications can set this field to point to an array of clipping rectangles. @@ -204,7 +204,7 @@ are undefined. ``void * bitmap`` When chroma-keying has *not* been negotiated and - :ref:`VIDIOC_G_FBUF` indicated this capability, + :ref:`VIDIOC_G_FBUF ` indicated this capability, applications can set this field to point to a clipping bit mask. It must be of the same size as the window, ``w.width`` and ``w.height``. diff --git a/Documentation/linux_tv/media/v4l/dev-radio.rst b/Documentation/linux_tv/media/v4l/dev-radio.rst index 7a0d25a143a6..55a56fb5d958 100644 --- a/Documentation/linux_tv/media/v4l/dev-radio.rst +++ b/Documentation/linux_tv/media/v4l/dev-radio.rst @@ -47,8 +47,8 @@ discussed in :ref:`tuner`) with index number zero to select the radio frequency and to determine if a monaural or FM stereo program is received/emitted. Drivers switch automatically between AM and FM depending on the selected frequency. The -:ref:`VIDIOC_G_TUNER` or -:ref:`VIDIOC_G_MODULATOR` ioctl reports the +:ref:`VIDIOC_G_TUNER ` or +:ref:`VIDIOC_G_MODULATOR ` ioctl reports the supported frequency range. diff --git a/Documentation/linux_tv/media/v4l/dev-raw-vbi.rst b/Documentation/linux_tv/media/v4l/dev-raw-vbi.rst index 2cd813a5b4e4..596b0a6b2177 100644 --- a/Documentation/linux_tv/media/v4l/dev-raw-vbi.rst +++ b/Documentation/linux_tv/media/v4l/dev-raw-vbi.rst @@ -71,7 +71,7 @@ parameters and then checking if the actual parameters are suitable. To query the current raw VBI capture parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_VBI_CAPTURE`` or ``V4L2_BUF_TYPE_VBI_OUTPUT``, and call -the :ref:`VIDIOC_G_FMT` ioctl with a pointer to this +the :ref:`VIDIOC_G_FMT ` ioctl with a pointer to this structure. Drivers fill the struct :ref:`v4l2_vbi_format ` ``vbi`` member of the ``fmt`` union. @@ -80,7 +80,7 @@ To request different parameters applications set the ``type`` field of a struct :ref:`v4l2_format ` as above and initialize all fields of the struct :ref:`v4l2_vbi_format ` ``vbi`` member of the ``fmt`` union, or better just modify the results -of :ref:`VIDIOC_G_FMT`, and call the :ref:`VIDIOC_S_FMT ` +of :ref:`VIDIOC_G_FMT `, and call the :ref:`VIDIOC_S_FMT ` ioctl with a pointer to this structure. Drivers return an EINVAL error code only when the given parameters are ambiguous, otherwise they modify the parameters according to the hardware capabilities and return the @@ -94,9 +94,9 @@ expect other resource allocation points which may return EBUSY, at the :ref:`VIDIOC_STREAMON` ioctl and the first read(), write() and select() call. -VBI devices must implement both the :ref:`VIDIOC_G_FMT` and +VBI devices must implement both the :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctl, even if :ref:`VIDIOC_S_FMT ` ignores all requests -and always returns default parameters as :ref:`VIDIOC_G_FMT` does. +and always returns default parameters as :ref:`VIDIOC_G_FMT ` does. :ref:`VIDIOC_TRY_FMT ` is optional. diff --git a/Documentation/linux_tv/media/v4l/dev-sliced-vbi.rst b/Documentation/linux_tv/media/v4l/dev-sliced-vbi.rst index d53353afbedf..3692cdf8e756 100644 --- a/Documentation/linux_tv/media/v4l/dev-sliced-vbi.rst +++ b/Documentation/linux_tv/media/v4l/dev-sliced-vbi.rst @@ -57,7 +57,7 @@ Sliced VBI Format Negotiation To find out which data services are supported by the hardware applications can call the -:ref:`VIDIOC_G_SLICED_VBI_CAP` ioctl. +:ref:`VIDIOC_G_SLICED_VBI_CAP ` ioctl. All drivers implementing the sliced VBI interface must support this ioctl. The results may differ from those of the :ref:`VIDIOC_S_FMT ` ioctl when the number of VBI @@ -70,7 +70,7 @@ To determine the currently selected services applications set the ``type`` field of struct :ref:`v4l2_format ` to ``V4L2_BUF_TYPE_SLICED_VBI_CAPTURE`` or ``V4L2_BUF_TYPE_SLICED_VBI_OUTPUT``, and the -:ref:`VIDIOC_G_FMT` ioctl fills the ``fmt.sliced`` +:ref:`VIDIOC_G_FMT ` ioctl fills the ``fmt.sliced`` member, a struct :ref:`v4l2_sliced_vbi_format `. @@ -432,7 +432,7 @@ the :ref:`VIDIOC_QBUF` ioctl must return an EINVAL error code when applications violate this rule. They must also return an EINVAL error code when applications pass an incorrect field or line number, or a combination of ``field``, ``line`` and ``id`` which has not -been negotiated with the :ref:`VIDIOC_G_FMT` or +been negotiated with the :ref:`VIDIOC_G_FMT ` or :ref:`VIDIOC_S_FMT ` ioctl. When the line numbers are unknown the driver must pass the packets in transmitted order. The driver can insert empty packets with ``id`` set to zero anywhere in the diff --git a/Documentation/linux_tv/media/v4l/diff-v4l.rst b/Documentation/linux_tv/media/v4l/diff-v4l.rst index 06fdd877d77d..ee9623b454a4 100644 --- a/Documentation/linux_tv/media/v4l/diff-v4l.rst +++ b/Documentation/linux_tv/media/v4l/diff-v4l.rst @@ -204,7 +204,7 @@ introduction. - ``-`` - - Applications can call the :ref:`VIDIOC_G_CROP` + - Applications can call the :ref:`VIDIOC_G_CROP ` ioctl to determine if the device supports capturing a subsection of the full picture ("cropping" in V4L2). If not, the ioctl returns the EINVAL error code. For more information on cropping @@ -248,7 +248,7 @@ introduction. The ``audios`` field was replaced by ``capabilities`` flag ``V4L2_CAP_AUDIO``, indicating *if* the device has any audio inputs or outputs. To determine their number applications can enumerate audio -inputs with the :ref:`VIDIOC_G_AUDIO` ioctl. The +inputs with the :ref:`VIDIOC_G_AUDIO ` ioctl. The audio ioctls are described in :ref:`audio`. The ``maxwidth``, ``maxheight``, ``minwidth`` and ``minheight`` fields @@ -265,7 +265,7 @@ V4L provides the ``VIDIOCGCHAN`` and ``VIDIOCSCHAN`` ioctl using struct :c:type:`struct video_channel` to enumerate the video inputs of a V4L device. The equivalent V4L2 ioctls are :ref:`VIDIOC_ENUMINPUT`, -:ref:`VIDIOC_G_INPUT` and +:ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_S_INPUT ` using struct :ref:`v4l2_input ` as discussed in :ref:`video`. @@ -328,7 +328,7 @@ Tuning The V4L ``VIDIOCGTUNER`` and ``VIDIOCSTUNER`` ioctl and struct :c:type:`struct video_tuner` can be used to enumerate the tuners of a V4L TV or radio device. The equivalent V4L2 ioctls are -:ref:`VIDIOC_G_TUNER` and +:ref:`VIDIOC_G_TUNER ` and :ref:`VIDIOC_S_TUNER ` using struct :ref:`v4l2_tuner `. Tuners are covered in :ref:`tuner`. @@ -360,7 +360,7 @@ the struct :ref:`v4l2_tuner ` ``capability`` field. The ``VIDIOCGFREQ`` and ``VIDIOCSFREQ`` ioctl to change the tuner frequency where renamed to -:ref:`VIDIOC_G_FREQUENCY` and +:ref:`VIDIOC_G_FREQUENCY ` and :ref:`VIDIOC_S_FREQUENCY `. They take a pointer to a struct :ref:`v4l2_frequency ` instead of an unsigned long integer. @@ -375,7 +375,7 @@ V4L2 has no equivalent of the ``VIDIOCGPICT`` and ``VIDIOCSPICT`` ioctl and struct :c:type:`struct video_picture`. The following fields where replaced by V4L2 controls accessible with the :ref:`VIDIOC_QUERYCTRL`, -:ref:`VIDIOC_G_CTRL` and +:ref:`VIDIOC_G_CTRL ` and :ref:`VIDIOC_S_CTRL ` ioctls: @@ -554,7 +554,7 @@ Audio The ``VIDIOCGAUDIO`` and ``VIDIOCSAUDIO`` ioctl and struct :c:type:`struct video_audio` are used to enumerate the audio inputs of a V4L device. The equivalent V4L2 ioctls are -:ref:`VIDIOC_G_AUDIO` and +:ref:`VIDIOC_G_AUDIO ` and :ref:`VIDIOC_S_AUDIO ` using struct :ref:`v4l2_audio ` as discussed in :ref:`audio`. @@ -577,7 +577,7 @@ stereo input, regardless if the source is a tuner. The following fields where replaced by V4L2 controls accessible with the :ref:`VIDIOC_QUERYCTRL`, -:ref:`VIDIOC_G_CTRL` and +:ref:`VIDIOC_G_CTRL ` and :ref:`VIDIOC_S_CTRL ` ioctls: @@ -638,7 +638,7 @@ Frame Buffer Overlay ==================== The V4L2 ioctls equivalent to ``VIDIOCGFBUF`` and ``VIDIOCSFBUF`` are -:ref:`VIDIOC_G_FBUF` and +:ref:`VIDIOC_G_FBUF ` and :ref:`VIDIOC_S_FBUF `. The ``base`` field of struct :c:type:`struct video_buffer` remained unchanged, except V4L2 defines a flag to indicate non-destructive overlays instead of a ``NULL`` @@ -650,7 +650,7 @@ list of RGB formats and their respective color depths. Instead of the special ioctls ``VIDIOCGWIN`` and ``VIDIOCSWIN`` V4L2 uses the general-purpose data format negotiation ioctls -:ref:`VIDIOC_G_FMT` and +:ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT `. They take a pointer to a struct :ref:`v4l2_format ` as argument. Here the ``win`` member of the ``fmt`` union is used, a struct @@ -687,7 +687,7 @@ Cropping To capture only a subsection of the full picture V4L defines the ``VIDIOCGCAPTURE`` and ``VIDIOCSCAPTURE`` ioctls using struct :c:type:`struct video_capture`. The equivalent V4L2 ioctls are -:ref:`VIDIOC_G_CROP` and +:ref:`VIDIOC_G_CROP ` and :ref:`VIDIOC_S_CROP ` using struct :ref:`v4l2_crop `, and the related :ref:`VIDIOC_CROPCAP` ioctl. This is a rather @@ -726,7 +726,7 @@ functions. To select an image format and size, V4L provides the ``VIDIOCSPICT`` and ``VIDIOCSWIN`` ioctls. V4L2 uses the general-purpose data format -negotiation ioctls :ref:`VIDIOC_G_FMT` and +negotiation ioctls :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT `. They take a pointer to a struct :ref:`v4l2_format ` as argument, here the struct :ref:`v4l2_pix_format ` named ``pix`` of its diff --git a/Documentation/linux_tv/media/v4l/dv-timings.rst b/Documentation/linux_tv/media/v4l/dv-timings.rst index 4b22b1b0fccb..cde46bc95c79 100644 --- a/Documentation/linux_tv/media/v4l/dv-timings.rst +++ b/Documentation/linux_tv/media/v4l/dv-timings.rst @@ -29,7 +29,7 @@ device applications use the DV timings for the device applications use the :ref:`VIDIOC_S_DV_TIMINGS ` ioctl and to get current DV timings they use the -:ref:`VIDIOC_G_DV_TIMINGS` ioctl. To detect +:ref:`VIDIOC_G_DV_TIMINGS ` ioctl. To detect the DV timings as seen by the video receiver applications use the :ref:`VIDIOC_QUERY_DV_TIMINGS` ioctl. diff --git a/Documentation/linux_tv/media/v4l/extended-controls.rst b/Documentation/linux_tv/media/v4l/extended-controls.rst index 9a10edc50fa0..38b85d7b1022 100644 --- a/Documentation/linux_tv/media/v4l/extended-controls.rst +++ b/Documentation/linux_tv/media/v4l/extended-controls.rst @@ -39,11 +39,11 @@ The Extended Control API ======================== Three new ioctls are available: -:ref:`VIDIOC_G_EXT_CTRLS`, +:ref:`VIDIOC_G_EXT_CTRLS `, :ref:`VIDIOC_S_EXT_CTRLS ` and :ref:`VIDIOC_TRY_EXT_CTRLS `. These ioctls act on arrays of controls (as opposed to the -:ref:`VIDIOC_G_CTRL` and +:ref:`VIDIOC_G_CTRL ` and :ref:`VIDIOC_S_CTRL ` ioctls that act on a single control). This is needed since it is often required to atomically change several controls at once. diff --git a/Documentation/linux_tv/media/v4l/format.rst b/Documentation/linux_tv/media/v4l/format.rst index 0184b5931709..e9b1201fe316 100644 --- a/Documentation/linux_tv/media/v4l/format.rst +++ b/Documentation/linux_tv/media/v4l/format.rst @@ -23,7 +23,7 @@ current selection. A single mechanism exists to negotiate all data formats using the aggregate struct :ref:`v4l2_format ` and the -:ref:`VIDIOC_G_FMT` and +:ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctls. Additionally the :ref:`VIDIOC_TRY_FMT ` ioctl can be used to examine what the hardware *could* do, without actually selecting a new data @@ -64,7 +64,7 @@ earlier versions of V4L2. Switching the logical stream or returning into *may* support a switch using :ref:`VIDIOC_S_FMT `. All drivers exchanging data with applications must support the -:ref:`VIDIOC_G_FMT` and :ref:`VIDIOC_S_FMT ` ioctl. Implementation of the +:ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctl. Implementation of the :ref:`VIDIOC_TRY_FMT ` is highly recommended but optional. diff --git a/Documentation/linux_tv/media/v4l/func-read.rst b/Documentation/linux_tv/media/v4l/func-read.rst index 0eae26288189..497bc9a9dd5a 100644 --- a/Documentation/linux_tv/media/v4l/func-read.rst +++ b/Documentation/linux_tv/media/v4l/func-read.rst @@ -85,7 +85,7 @@ enough. Again, the behavior when the driver runs out of free buffers depends on the discarding policy. Applications can get and set the number of buffers used internally by -the driver with the :ref:`VIDIOC_G_PARM` and +the driver with the :ref:`VIDIOC_G_PARM ` and :ref:`VIDIOC_S_PARM ` ioctls. They are optional, however. The discarding policy is not reported and cannot be changed. For minimum requirements see :ref:`devices`. diff --git a/Documentation/linux_tv/media/v4l/hist-v4l2.rst b/Documentation/linux_tv/media/v4l/hist-v4l2.rst index 4bd621b3aa03..bb115a0f2427 100644 --- a/Documentation/linux_tv/media/v4l/hist-v4l2.rst +++ b/Documentation/linux_tv/media/v4l/hist-v4l2.rst @@ -40,7 +40,7 @@ enumerable. :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 ` to :ref:`VIDIOC_ENUMINPUT`. A first draft of the Codec API was released. @@ -52,7 +52,7 @@ material changes to struct :ref:`v4l2_capability `. 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 ` and :ref:`VIDIOC_S_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 @@ -142,7 +142,7 @@ common Linux driver API conventions. 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 ` and :ref:`VIDIOC_S_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 @@ -246,13 +246,13 @@ correctly through the backward compatibility layer. [Solution?] 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 ` and :ref:`VIDIOC_S_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 ` and :ref:`VIDIOC_S_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 @@ -401,7 +401,7 @@ This unnamed version was finally merged into Linux 2.5.46. supported standards with an ioctl applications can now refer to standards by :ref:`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 ` and :ref:`VIDIOC_S_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 @@ -716,14 +716,14 @@ V4L2 2003-06-19 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 ` 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 ` now reports the current audio input. The same changes were made to @@ -940,7 +940,7 @@ V4L2 in Linux 2.6.17 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 ` section for details. V4L2 spec erratum 2006-09-23 (Draft 0.15) @@ -950,13 +950,13 @@ 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 ` it was clarified that the struct :ref:`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 ` it was clarified that applications must initialize the tuner ``type`` field of struct :ref:`v4l2_frequency ` before calling :ref:`VIDIOC_S_FREQUENCY `. @@ -976,7 +976,7 @@ V4L2 spec erratum 2006-09-23 (Draft 0.15) V4L2 in Linux 2.6.18 ==================== -1. New ioctls :ref:`VIDIOC_G_EXT_CTRLS`, +1. New ioctls :ref:`VIDIOC_G_EXT_CTRLS `, :ref:`VIDIOC_S_EXT_CTRLS ` and :ref:`VIDIOC_TRY_EXT_CTRLS ` were added, a flag to skip unsupported controls with @@ -995,7 +995,7 @@ V4L2 in Linux 2.6.19 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 ` 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 @@ -1034,7 +1034,7 @@ V4L2 in Linux 2.6.22 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 ` and :ref:`VIDIOC_S_FBUF ` ioctls for details. A new ``global_alpha`` field was added to diff --git a/Documentation/linux_tv/media/v4l/libv4l-introduction.rst b/Documentation/linux_tv/media/v4l/libv4l-introduction.rst index bc3eb48e1d9f..b8d247dc236d 100644 --- a/Documentation/linux_tv/media/v4l/libv4l-introduction.rst +++ b/Documentation/linux_tv/media/v4l/libv4l-introduction.rst @@ -92,7 +92,7 @@ and to enhance the image quality. In most cases, libv4l2 just passes the calls directly through to the v4l2 driver, intercepting the calls to :ref:`VIDIOC_TRY_FMT `, -:ref:`VIDIOC_G_FMT` +:ref:`VIDIOC_G_FMT ` :ref:`VIDIOC_S_FMT ` :ref:`VIDIOC_ENUM_FRAMESIZES` and :ref:`VIDIOC_ENUM_FRAMEINTERVALS` in diff --git a/Documentation/linux_tv/media/v4l/pixfmt-013.rst b/Documentation/linux_tv/media/v4l/pixfmt-013.rst index 7584cb2e5702..b3cb7c48eb74 100644 --- a/Documentation/linux_tv/media/v4l/pixfmt-013.rst +++ b/Documentation/linux_tv/media/v4l/pixfmt-013.rst @@ -27,7 +27,7 @@ Compressed Formats - 'JPEG' - - TBD. See also :ref:`VIDIOC_G_JPEGCOMP`, + - TBD. See also :ref:`VIDIOC_G_JPEGCOMP `, :ref:`VIDIOC_S_JPEGCOMP `. - .. _`V4L2-PIX-FMT-MPEG`: diff --git a/Documentation/linux_tv/media/v4l/pixfmt.rst b/Documentation/linux_tv/media/v4l/pixfmt.rst index b0e6a95a7205..f2c599aaa502 100644 --- a/Documentation/linux_tv/media/v4l/pixfmt.rst +++ b/Documentation/linux_tv/media/v4l/pixfmt.rst @@ -13,7 +13,7 @@ single-planar API, while the latter is used with the multi-planar version (see :ref:`planar-apis`). Image formats are negotiated with the :ref:`VIDIOC_S_FMT ` ioctl. (The explanations here focus on video capturing and output, for overlay frame buffer formats -see also :ref:`VIDIOC_G_FBUF`.) +see also :ref:`VIDIOC_G_FBUF `.) .. toctree:: diff --git a/Documentation/linux_tv/media/v4l/planar-apis.rst b/Documentation/linux_tv/media/v4l/planar-apis.rst index 0546210f868f..cf078650a0a8 100644 --- a/Documentation/linux_tv/media/v4l/planar-apis.rst +++ b/Documentation/linux_tv/media/v4l/planar-apis.rst @@ -44,7 +44,7 @@ Calls that distinguish between single and multi-planar APIs together with non-multi-planar ones for devices that handle both single- and multi-planar formats. -:ref:`VIDIOC_G_FMT`, +:ref:`VIDIOC_G_FMT `, :ref:`VIDIOC_S_FMT `, :ref:`VIDIOC_TRY_FMT ` New structures for describing multi-planar formats are added: struct diff --git a/Documentation/linux_tv/media/v4l/standard.rst b/Documentation/linux_tv/media/v4l/standard.rst index ec39b2b39e67..20c0d044a129 100644 --- a/Documentation/linux_tv/media/v4l/standard.rst +++ b/Documentation/linux_tv/media/v4l/standard.rst @@ -36,7 +36,7 @@ Composite input may collapse standards, enumerating "PAL-B/G/H/I", "NTSC-M" and "SECAM-D/K". [1]_ To query and select the standard used by the current video input or -output applications call the :ref:`VIDIOC_G_STD` and +output applications call the :ref:`VIDIOC_G_STD ` and :ref:`VIDIOC_S_STD ` ioctl, respectively. The *received* standard can be sensed with the :ref:`VIDIOC_QUERYSTD` ioctl. Note that the @@ -56,7 +56,7 @@ output device which is: Here the driver shall set the ``std`` field of struct :ref:`v4l2_input ` and struct -:ref:`v4l2_output ` to zero and the :ref:`VIDIOC_G_STD`, +:ref:`v4l2_output ` to zero and the :ref:`VIDIOC_G_STD `, :ref:`VIDIOC_S_STD `, :ref:`VIDIOC_QUERYSTD` and :ref:`VIDIOC_ENUMSTD` ioctls shall return the ENOTTY error code or the EINVAL error code. diff --git a/Documentation/linux_tv/media/v4l/streaming-par.rst b/Documentation/linux_tv/media/v4l/streaming-par.rst index 10420478a3b0..bb8100b6ef87 100644 --- a/Documentation/linux_tv/media/v4l/streaming-par.rst +++ b/Documentation/linux_tv/media/v4l/streaming-par.rst @@ -23,7 +23,7 @@ internally by a driver in read/write mode. For implications see the section discussing the :ref:`read() ` function. To get and set the streaming parameters applications call the -:ref:`VIDIOC_G_PARM` and +:ref:`VIDIOC_G_PARM ` and :ref:`VIDIOC_S_PARM ` ioctl, respectively. They take a pointer to a struct :ref:`v4l2_streamparm `, which contains a union holding separate parameters for input and output diff --git a/Documentation/linux_tv/media/v4l/tuner.rst b/Documentation/linux_tv/media/v4l/tuner.rst index 67f4e24709b5..9c98e4f64c85 100644 --- a/Documentation/linux_tv/media/v4l/tuner.rst +++ b/Documentation/linux_tv/media/v4l/tuner.rst @@ -22,9 +22,9 @@ Radio input devices have exactly one tuner with index zero, no video inputs. To query and change tuner properties applications use the -:ref:`VIDIOC_G_TUNER` and +:ref:`VIDIOC_G_TUNER ` and :ref:`VIDIOC_S_TUNER ` ioctls, respectively. The -struct :ref:`v4l2_tuner ` returned by :ref:`VIDIOC_G_TUNER` +struct :ref:`v4l2_tuner ` returned by :ref:`VIDIOC_G_TUNER ` also contains signal status information applicable when the tuner of the current video or radio input is queried. Note that :ref:`VIDIOC_S_TUNER ` does not switch the current tuner, when there is more than one at all. @@ -59,7 +59,7 @@ functionality. The reason is a limitation with the cannot specify whether the frequency is for a tuner or a modulator. To query and change modulator properties applications use the -:ref:`VIDIOC_G_MODULATOR` and +:ref:`VIDIOC_G_MODULATOR ` and :ref:`VIDIOC_S_MODULATOR ` ioctl. Note that :ref:`VIDIOC_S_MODULATOR ` does not switch the current modulator, when there is more than one at all. The modulator is solely determined by the @@ -74,7 +74,7 @@ Radio Frequency =============== To get and set the tuner or modulator radio frequency applications use -the :ref:`VIDIOC_G_FREQUENCY` and +the :ref:`VIDIOC_G_FREQUENCY ` and :ref:`VIDIOC_S_FREQUENCY ` ioctl which both take a pointer to a struct :ref:`v4l2_frequency `. These ioctls are used for TV and radio devices alike. Drivers must support diff --git a/Documentation/linux_tv/media/v4l/video.rst b/Documentation/linux_tv/media/v4l/video.rst index 9f2dc4ee4fcd..8e10ecc27123 100644 --- a/Documentation/linux_tv/media/v4l/video.rst +++ b/Documentation/linux_tv/media/v4l/video.rst @@ -20,8 +20,8 @@ struct :ref:`v4l2_input ` returned by the :ref:`VIDIOC_ENUMINPUT` ioctl also contains signal :status information applicable when the current video input is queried. -The :ref:`VIDIOC_G_INPUT` and -:ref:`VIDIOC_G_OUTPUT` ioctls return the index of +The :ref:`VIDIOC_G_INPUT ` and +:ref:`VIDIOC_G_OUTPUT ` ioctls return the index of the current video input or output. To select a different input or output applications call the :ref:`VIDIOC_S_INPUT ` and :ref:`VIDIOC_S_OUTPUT ` ioctls. Drivers must diff --git a/Documentation/linux_tv/media/v4l/vidioc-create-bufs.rst b/Documentation/linux_tv/media/v4l/vidioc-create-bufs.rst index d269eab4d2b6..53db867aa9db 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-create-bufs.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-create-bufs.rst @@ -48,7 +48,7 @@ The ``format`` field specifies the image format that the buffers must be able to handle. The application has to fill in this struct :ref:`v4l2_format `. Usually this will be done using the :ref:`VIDIOC_TRY_FMT ` or -:ref:`VIDIOC_G_FMT` ioctls to ensure that the +:ref:`VIDIOC_G_FMT ` ioctls to ensure that the requested format is supported by the driver. Based on the format's ``type`` field the requested buffer size (for single-planar) or plane sizes (for multi-planar formats) will be used for the allocated buffers. diff --git a/Documentation/linux_tv/media/v4l/vidioc-enumaudio.rst b/Documentation/linux_tv/media/v4l/vidioc-enumaudio.rst index 0fc0c3eeae5f..8ae7b8bd9333 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-enumaudio.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-enumaudio.rst @@ -39,7 +39,7 @@ structure or return an EINVAL error code when the index is out of bounds. To enumerate all audio inputs applications shall begin at index zero, incrementing by one until the driver returns EINVAL. -See :ref:`VIDIOC_G_AUDIO` for a description of struct +See :ref:`VIDIOC_G_AUDIO ` for a description of struct :ref:`v4l2_audio `. diff --git a/Documentation/linux_tv/media/v4l/vidioc-enumaudioout.rst b/Documentation/linux_tv/media/v4l/vidioc-enumaudioout.rst index 29735eddac5d..0e45f41fa608 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-enumaudioout.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-enumaudioout.rst @@ -42,7 +42,7 @@ zero, incrementing by one until the driver returns EINVAL. Note connectors on a TV card to loop back the received audio signal to a sound card are not audio outputs in this sense. -See :ref:`VIDIOC_G_AUDIOout` for a description of struct +See :ref:`VIDIOC_G_AUDIOout ` for a description of struct :ref:`v4l2_audioout `. diff --git a/Documentation/linux_tv/media/v4l/vidioc-enumstd.rst b/Documentation/linux_tv/media/v4l/vidioc-enumstd.rst index e292b7d50cc3..03353b92449a 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-enumstd.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-enumstd.rst @@ -401,7 +401,7 @@ ENODATA .. [1] The supported standards may overlap and we need an unambiguous set to - find the current standard returned by :ref:`VIDIOC_G_STD`. + find the current standard returned by :ref:`VIDIOC_G_STD `. .. [2] Japan uses a standard similar to M/NTSC (V4L2_STD_NTSC_M_JP). diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-audio.rst b/Documentation/linux_tv/media/v4l/vidioc-g-audio.rst index be8899d87e33..4b79523bfbab 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-audio.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-audio.rst @@ -36,7 +36,7 @@ Description To query the current audio input applications zero out the ``reserved`` array of a struct :ref:`v4l2_audio ` and call the -:ref:`VIDIOC_G_AUDIO` ioctl with a pointer to this structure. Drivers fill +:ref:`VIDIOC_G_AUDIO ` ioctl with a pointer to this structure. Drivers fill the rest of the structure or return an EINVAL error code when the device has no audio inputs, or none which combine with the current video input. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-crop.rst b/Documentation/linux_tv/media/v4l/vidioc-g-crop.rst index 0a9ede92bc9f..b0503710c2dd 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-crop.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-crop.rst @@ -36,7 +36,7 @@ Description To query the cropping rectangle size and position applications set the ``type`` field of a :c:type:`struct v4l2_crop` structure to the -respective buffer (stream) type and call the :ref:`VIDIOC_G_CROP` ioctl +respective buffer (stream) type and call the :ref:`VIDIOC_G_CROP ` ioctl with a pointer to this structure. The driver fills the rest of the structure or returns the EINVAL error code if cropping is not supported. @@ -66,7 +66,7 @@ vertical scaling factor. Finally the driver programs the hardware with the actual cropping and image parameters. :ref:`VIDIOC_S_CROP ` is a write-only ioctl, it does not return the actual parameters. To query them applications must call -:ref:`VIDIOC_G_CROP` and :ref:`VIDIOC_G_FMT`. When the +:ref:`VIDIOC_G_CROP ` and :ref:`VIDIOC_G_FMT`. When the parameters are unsuitable the application may modify the cropping or image parameters and repeat the cycle until satisfactory parameters have been negotiated. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-ctrl.rst b/Documentation/linux_tv/media/v4l/vidioc-g-ctrl.rst index 41561c5e444d..55bb8ae9be10 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-ctrl.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-ctrl.rst @@ -34,7 +34,7 @@ Description To get the current value of a control applications initialize the ``id`` field of a struct :c:type:`struct v4l2_control` and call the -:ref:`VIDIOC_G_CTRL` ioctl with a pointer to this structure. To change the +:ref:`VIDIOC_G_CTRL ` ioctl with a pointer to this structure. To change the value of a control applications initialize the ``id`` and ``value`` fields of a struct :c:type:`struct v4l2_control` and call the :ref:`VIDIOC_S_CTRL ` ioctl. @@ -48,7 +48,7 @@ actual new value. If the ``value`` is inappropriate for the control EINVAL error code is returned as well. These ioctls work only with user controls. For other control classes the -:ref:`VIDIOC_G_EXT_CTRLS`, +:ref:`VIDIOC_G_EXT_CTRLS `, :ref:`VIDIOC_S_EXT_CTRLS ` or :ref:`VIDIOC_TRY_EXT_CTRLS ` must be used. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-dv-timings.rst b/Documentation/linux_tv/media/v4l/vidioc-g-dv-timings.rst index cc7cf06e74ee..43734bb649c5 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-dv-timings.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-dv-timings.rst @@ -37,7 +37,7 @@ Description To set DV timings for the input or output, applications use the :ref:`VIDIOC_S_DV_TIMINGS ` ioctl and to get the current timings, -applications use the :ref:`VIDIOC_G_DV_TIMINGS` ioctl. The detailed timing +applications use the :ref:`VIDIOC_G_DV_TIMINGS ` ioctl. The detailed timing information is filled in using the structure struct :ref:`v4l2_dv_timings `. These ioctls take a pointer to the struct :ref:`v4l2_dv_timings ` diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-edid.rst b/Documentation/linux_tv/media/v4l/vidioc-g-edid.rst index a1311a52b8fa..d6ccae92e107 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-edid.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-edid.rst @@ -52,7 +52,7 @@ value, then the EINVAL error code will be returned. To get the EDID data the application has to fill in the ``pad``, ``start_block``, ``blocks`` and ``edid`` fields, zero the ``reserved`` -array and call :ref:`VIDIOC_G_EDID`. The current EDID from block +array and call :ref:`VIDIOC_G_EDID `. The current EDID from block ``start_block`` and of size ``blocks`` will be placed in the memory ``edid`` points to. The ``edid`` pointer must point to memory at least ``blocks`` * 128 bytes large (the size of one block is 128 bytes). @@ -65,7 +65,7 @@ If blocks have to be retrieved from the sink, then this call will block until they have been read. If ``start_block`` and ``blocks`` are both set to 0 when -:ref:`VIDIOC_G_EDID` is called, then the driver will set ``blocks`` to the +:ref:`VIDIOC_G_EDID ` is called, then the driver will set ``blocks`` to the total number of available EDID blocks and it will return 0 without copying any data. This is an easy way to discover how many EDID blocks there are. Note that if there are no EDID blocks available at all, then diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-enc-index.rst b/Documentation/linux_tv/media/v4l/vidioc-g-enc-index.rst index 77c7eff9732d..c22907cddfac 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-enc-index.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-enc-index.rst @@ -31,19 +31,19 @@ Arguments Description =========== -The :ref:`VIDIOC_G_ENC_INDEX` ioctl provides meta data about a compressed +The :ref:`VIDIOC_G_ENC_INDEX ` ioctl provides meta data about a compressed video stream the same or another application currently reads from the driver, which is useful for random access into the stream without decoding it. -To read the data applications must call :ref:`VIDIOC_G_ENC_INDEX` with a +To read the data applications must call :ref:`VIDIOC_G_ENC_INDEX ` with a pointer to a struct :ref:`v4l2_enc_idx `. On success the driver fills the ``entry`` array, stores the number of elements written in the ``entries`` field, and initializes the ``entries_cap`` field. Each element of the ``entry`` array contains meta data about one -picture. A :ref:`VIDIOC_G_ENC_INDEX` call reads up to +picture. A :ref:`VIDIOC_G_ENC_INDEX ` call reads up to ``V4L2_ENC_IDX_ENTRIES`` entries from a driver buffer, which can hold up to ``entries_cap`` entries. This number can be lower or higher than ``V4L2_ENC_IDX_ENTRIES``, but not zero. When the application fails to diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/linux_tv/media/v4l/vidioc-g-ext-ctrls.rst index fb62cd0a991c..040deef04f7d 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-ext-ctrls.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-ext-ctrls.rst @@ -48,7 +48,7 @@ by the ``controls`` fields. To get the current value of a set of controls applications initialize the ``id``, ``size`` and ``reserved2`` fields of each struct :ref:`v4l2_ext_control ` and call the -:ref:`VIDIOC_G_EXT_CTRLS` ioctl. String controls controls must also set the +:ref:`VIDIOC_G_EXT_CTRLS ` ioctl. String controls controls must also set the ``string`` field. Controls of compound types (``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set) must set the ``ptr`` field. @@ -122,7 +122,7 @@ still cause this situation. - The total size in bytes of the payload of this control. This is normally 0, but for pointer controls this should be set to the size of the memory containing the payload, or that will receive - the payload. If :ref:`VIDIOC_G_EXT_CTRLS` finds that this value is + the payload. If :ref:`VIDIOC_G_EXT_CTRLS ` finds that this value is less than is required to store the payload result, then it is set to a value large enough to store the payload result and ENOSPC is returned. Note that for string controls this ``size`` field should @@ -328,7 +328,7 @@ still cause this situation. :ref:`VIDIOC_S_EXT_CTRLS ` fails with ``error_idx`` set to ``count``, then you can call :ref:`VIDIOC_TRY_EXT_CTRLS ` to try to discover the actual control that failed the validation step. Unfortunately, - there is no ``TRY`` equivalent for :ref:`VIDIOC_G_EXT_CTRLS`. + there is no ``TRY`` equivalent for :ref:`VIDIOC_G_EXT_CTRLS `. - .. row 6 @@ -367,7 +367,7 @@ still cause this situation. - The class containing user controls. These controls are described in :ref:`control`. All controls that can be set using the :ref:`VIDIOC_S_CTRL ` and - :ref:`VIDIOC_G_CTRL` ioctl belong to this + :ref:`VIDIOC_G_CTRL ` ioctl belong to this class. - .. row 2 diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-fbuf.rst b/Documentation/linux_tv/media/v4l/vidioc-g-fbuf.rst index e622e2f2435c..dbc68cfc608a 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-fbuf.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-fbuf.rst @@ -34,7 +34,7 @@ Arguments Description =========== -Applications can use the :ref:`VIDIOC_G_FBUF` and :ref:`VIDIOC_S_FBUF ` ioctl +Applications can use the :ref:`VIDIOC_G_FBUF ` and :ref:`VIDIOC_S_FBUF ` ioctl to get and set the framebuffer parameters for a :ref:`Video Overlay ` or :ref:`Video Output Overlay ` (OSD). The type of overlay is implied by the device type (capture or @@ -48,7 +48,7 @@ of a graphics card. A non-destructive overlay blends video images into a VGA signal or graphics into a video signal. *Video Output Overlays* are always non-destructive. -To get the current parameters applications call the :ref:`VIDIOC_G_FBUF` +To get the current parameters applications call the :ref:`VIDIOC_G_FBUF ` ioctl with a pointer to a :c:type:`struct v4l2_framebuffer` structure. The driver fills all fields of the structure or returns an EINVAL error code when overlays are not supported. @@ -59,13 +59,13 @@ initialize the ``flags`` field of a struct implemented on the TV card all other parameters are determined by the driver. When an application calls :ref:`VIDIOC_S_FBUF ` with a pointer to this structure, the driver prepares for the overlay and returns the -framebuffer parameters as :ref:`VIDIOC_G_FBUF` does, or it returns an error +framebuffer parameters as :ref:`VIDIOC_G_FBUF ` does, or it returns an error code. To set the parameters for a *non-destructive Video Overlay*, applications must initialize the ``flags`` field, the ``fmt`` substructure, and call :ref:`VIDIOC_S_FBUF `. Again the driver prepares for -the overlay and returns the framebuffer parameters as :ref:`VIDIOC_G_FBUF` +the overlay and returns the framebuffer parameters as :ref:`VIDIOC_G_FBUF ` does, or it returns an error code. For a *destructive Video Overlay* applications must additionally provide diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-fmt.rst b/Documentation/linux_tv/media/v4l/vidioc-g-fmt.rst index 8c07fe2454e2..3ac4fb764a7e 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-fmt.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-fmt.rst @@ -41,7 +41,7 @@ struct :c:type:`struct v4l2_format` to the respective buffer (stream) type. For example video capture devices use ``V4L2_BUF_TYPE_VIDEO_CAPTURE`` or ``V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE``. When the application calls the -:ref:`VIDIOC_G_FMT` ioctl with a pointer to this structure the driver fills +:ref:`VIDIOC_G_FMT ` ioctl with a pointer to this structure the driver fills the respective member of the ``fmt`` union. In case of video capture devices that is either the struct :ref:`v4l2_pix_format ` ``pix`` or the struct @@ -62,10 +62,10 @@ this is a mechanism to fathom device capabilities and to approach parameters acceptable for both the application and driver. On success the driver may program the hardware, allocate resources and generally prepare for data exchange. Finally the :ref:`VIDIOC_S_FMT ` ioctl returns -the current format parameters as :ref:`VIDIOC_G_FMT` does. Very simple, +the current format parameters as :ref:`VIDIOC_G_FMT ` does. Very simple, inflexible devices may even ignore all input and always return the default parameters. However all V4L2 devices exchanging data with the -application must implement the :ref:`VIDIOC_G_FMT` and :ref:`VIDIOC_S_FMT ` +application must implement the :ref:`VIDIOC_G_FMT ` and :ref:`VIDIOC_S_FMT ` ioctl. When the requested buffer type is not supported drivers return an EINVAL error code on a :ref:`VIDIOC_S_FMT ` attempt. When I/O is already in progress or the resource is not available for other reasons drivers diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-frequency.rst b/Documentation/linux_tv/media/v4l/vidioc-g-frequency.rst index 19a5ae9c4bcd..b187f1345bb4 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-frequency.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-frequency.rst @@ -39,7 +39,7 @@ the ``tuner`` field of a struct :ref:`v4l2_frequency ` to the respective tuner or modulator number (only input devices have tuners, only output devices have modulators), zero out the ``reserved`` array and call the -:ref:`VIDIOC_G_FREQUENCY` ioctl with a pointer to this structure. The +:ref:`VIDIOC_G_FREQUENCY ` ioctl with a pointer to this structure. The driver stores the current frequency in the ``frequency`` field. To change the current tuner or modulator radio frequency applications diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-input.rst b/Documentation/linux_tv/media/v4l/vidioc-g-input.rst index 2bcaa324aa33..bb5944449650 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-input.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-input.rst @@ -33,7 +33,7 @@ Description =========== To query the current video input applications call the -:ref:`VIDIOC_G_INPUT` ioctl with a pointer to an integer where the driver +:ref:`VIDIOC_G_INPUT ` ioctl with a pointer to an integer where the driver stores the number of the input, as in the struct :ref:`v4l2_input ` ``index`` field. This ioctl will fail only when there are no video inputs, returning EINVAL. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-modulator.rst b/Documentation/linux_tv/media/v4l/vidioc-g-modulator.rst index 83e761eaef2b..913b7d96faba 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-modulator.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-modulator.rst @@ -37,7 +37,7 @@ Description To query the attributes of a modulator applications initialize the ``index`` field and zero out the ``reserved`` array of a struct :ref:`v4l2_modulator ` and call the -:ref:`VIDIOC_G_MODULATOR` ioctl with a pointer to this structure. Drivers +:ref:`VIDIOC_G_MODULATOR ` ioctl with a pointer to this structure. Drivers fill the rest of the structure or return an EINVAL error code when the index is out of bounds. To enumerate all modulators applications shall begin at index zero, incrementing by one until the driver returns diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-output.rst b/Documentation/linux_tv/media/v4l/vidioc-g-output.rst index ebed04ae48da..e48bf39cfa10 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-output.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-output.rst @@ -33,7 +33,7 @@ Description =========== To query the current video output applications call the -:ref:`VIDIOC_G_OUTPUT` ioctl with a pointer to an integer where the driver +:ref:`VIDIOC_G_OUTPUT ` ioctl with a pointer to an integer where the driver stores the number of the output, as in the struct :ref:`v4l2_output ` ``index`` field. This ioctl will fail only when there are no video outputs, returning the EINVAL error diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-parm.rst b/Documentation/linux_tv/media/v4l/vidioc-g-parm.rst index 906faaa85bfa..0567fce18144 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-parm.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-parm.rst @@ -44,7 +44,7 @@ internally by a driver in read/write mode. For implications see the section discussing the :ref:`read() ` function. To get and set the streaming parameters applications call the -:ref:`VIDIOC_G_PARM` and :ref:`VIDIOC_S_PARM ` ioctl, respectively. They take a +:ref:`VIDIOC_G_PARM ` and :ref:`VIDIOC_S_PARM ` ioctl, respectively. They take a pointer to a struct :c:type:`struct v4l2_streamparm` which contains a union holding separate parameters for input and output devices. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-priority.rst b/Documentation/linux_tv/media/v4l/vidioc-g-priority.rst index db95647d3a80..b241970c8aee 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-priority.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-priority.rst @@ -36,7 +36,7 @@ Description =========== To query the current access priority applications call the -:ref:`VIDIOC_G_PRIORITY` ioctl with a pointer to an enum v4l2_priority +:ref:`VIDIOC_G_PRIORITY ` ioctl with a pointer to an enum v4l2_priority variable where the driver stores the current priority. To request an access priority applications store the desired priority in diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-sliced-vbi-cap.rst b/Documentation/linux_tv/media/v4l/vidioc-g-sliced-vbi-cap.rst index 635cb9b2c250..a051f93252d0 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-sliced-vbi-cap.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-sliced-vbi-cap.rst @@ -34,7 +34,7 @@ Description To find out which data services are supported by a sliced VBI capture or output device, applications initialize the ``type`` field of a struct :ref:`v4l2_sliced_vbi_cap `, clear the -``reserved`` array and call the :ref:`VIDIOC_G_SLICED_VBI_CAP` ioctl. The +``reserved`` array and call the :ref:`VIDIOC_G_SLICED_VBI_CAP ` ioctl. The driver fills in the remaining fields or returns an EINVAL error code if the sliced VBI API is unsupported or ``type`` is invalid. diff --git a/Documentation/linux_tv/media/v4l/vidioc-g-std.rst b/Documentation/linux_tv/media/v4l/vidioc-g-std.rst index bc8e071401b0..a7257f0b38a2 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-g-std.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-g-std.rst @@ -35,15 +35,15 @@ Description =========== To query and select the current video standard applications use the -:ref:`VIDIOC_G_STD` and :ref:`VIDIOC_S_STD ` ioctls which take a pointer to a -:ref:`v4l2_std_id ` type as argument. :ref:`VIDIOC_G_STD` +:ref:`VIDIOC_G_STD ` and :ref:`VIDIOC_S_STD ` ioctls which take a pointer to a +:ref:`v4l2_std_id ` type as argument. :ref:`VIDIOC_G_STD ` can return a single flag or a set of flags as in struct :ref:`v4l2_standard ` field ``id``. The flags must be unambiguous such that they appear in only one enumerated :c:type:`struct v4l2_standard` structure. :ref:`VIDIOC_S_STD ` accepts one or more flags, being a write-only ioctl it -does not return the actual new standard as :ref:`VIDIOC_G_STD` does. When +does not return the actual new standard as :ref:`VIDIOC_G_STD ` does. When no flags are given or the current input does not support the requested standard the driver returns an EINVAL error code. When the standard set is ambiguous drivers may return EINVAL or choose any of the requested diff --git a/Documentation/linux_tv/media/v4l/vidioc-queryctrl.rst b/Documentation/linux_tv/media/v4l/vidioc-queryctrl.rst index 2b11efc3d257..7d38a51c4f73 100644 --- a/Documentation/linux_tv/media/v4l/vidioc-queryctrl.rst +++ b/Documentation/linux_tv/media/v4l/vidioc-queryctrl.rst @@ -569,7 +569,7 @@ See also the examples in :ref:`control`. :ref:`VIDIOC_S_EXT_CTRLS ` you need to set the ``size`` field of struct :ref:`v4l2_ext_control ` to 9. For - :ref:`VIDIOC_G_EXT_CTRLS` you can set + :ref:`VIDIOC_G_EXT_CTRLS ` you can set the ``size`` field to ``maximum`` + 1. Which character encoding is used will depend on the string control itself and should be part of the control documentation.