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Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-enumoutput.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-enumoutput.rst | 228 |
1 files changed, 81 insertions, 147 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-enumoutput.rst b/Documentation/media/uapi/v4l/vidioc-enumoutput.rst index 82fc9d3..d7dd274 100644 --- a/Documentation/media/uapi/v4l/vidioc-enumoutput.rst +++ b/Documentation/media/uapi/v4l/vidioc-enumoutput.rst @@ -15,7 +15,8 @@ VIDIOC_ENUMOUTPUT - Enumerate video outputs Synopsis ======== -.. cpp:function:: int ioctl( int fd, int request, struct v4l2_output *argp ) +.. c:function:: int ioctl( int fd, VIDIOC_ENUMOUTPUT, struct v4l2_output *argp ) + :name: VIDIOC_ENUMOUTPUT Arguments @@ -24,9 +25,6 @@ Arguments ``fd`` File descriptor returned by :ref:`open() <func-open>`. -``request`` - VIDIOC_ENUMOUTPUT - ``argp`` @@ -34,7 +32,7 @@ Description =========== To query the attributes of a video outputs applications initialize the -``index`` field of struct :ref:`v4l2_output <v4l2-output>` and call +``index`` field of struct :c:type:`v4l2_output` and call the :ref:`VIDIOC_ENUMOUTPUT` 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 outputs applications @@ -42,101 +40,65 @@ shall begin at index zero, incrementing by one until the driver returns EINVAL. -.. _v4l2-output: +.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}| + +.. c:type:: v4l2_output .. flat-table:: struct v4l2_output :header-rows: 0 :stub-columns: 0 :widths: 1 1 2 - - - .. row 1 - - - __u32 - - - ``index`` - - - Identifies the output, set by the application. - - - .. row 2 - - - __u8 - - - ``name``\ [32] - - - Name of the video output, a NUL-terminated ASCII string, for - example: "Vout". This information is intended for the user, - preferably the connector label on the device itself. - - - .. row 3 - - - __u32 - - - ``type`` - - - Type of the output, see :ref:`output-type`. - - - .. row 4 - - - __u32 - - - ``audioset`` - - - Drivers can enumerate up to 32 video and audio outputs. This field - shows which audio outputs were selectable as the current output if - this was the currently selected video output. It is a bit mask. - The LSB corresponds to audio output 0, the MSB to output 31. Any - number of bits can be set, or none. - - When the driver does not enumerate audio outputs no bits must be - set. Applications shall not interpret this as lack of audio - support. Drivers may automatically select audio outputs without - enumerating them. - - For details on audio outputs and how to select the current output - see :ref:`audio`. - - - .. row 5 - - - __u32 - - - ``modulator`` - - - Output devices can have zero or more RF modulators. When the - ``type`` is ``V4L2_OUTPUT_TYPE_MODULATOR`` this is an RF connector - and this field identifies the modulator. It corresponds to struct - :ref:`v4l2_modulator <v4l2-modulator>` field ``index``. For - details on modulators see :ref:`tuner`. - - - .. row 6 - - - :ref:`v4l2_std_id <v4l2-std-id>` - - - ``std`` - - - Every video output supports one or more different video standards. - This field is a set of all supported standards. For details on - video standards and how to switch see :ref:`standard`. - - - .. row 7 - - - __u32 - - - ``capabilities`` - - - This field provides capabilities for the output. See - :ref:`output-capabilities` for flags. - - - .. row 8 - - - __u32 - - - ``reserved``\ [3] - - - Reserved for future extensions. Drivers must set the array to - zero. - - + * - __u32 + - ``index`` + - Identifies the output, set by the application. + * - __u8 + - ``name``\ [32] + - Name of the video output, a NUL-terminated ASCII string, for + example: "Vout". This information is intended for the user, + preferably the connector label on the device itself. + * - __u32 + - ``type`` + - Type of the output, see :ref:`output-type`. + * - __u32 + - ``audioset`` + - Drivers can enumerate up to 32 video and audio outputs. This field + shows which audio outputs were selectable as the current output if + this was the currently selected video output. It is a bit mask. + The LSB corresponds to audio output 0, the MSB to output 31. Any + number of bits can be set, or none. + + When the driver does not enumerate audio outputs no bits must be + set. Applications shall not interpret this as lack of audio + support. Drivers may automatically select audio outputs without + enumerating them. + + For details on audio outputs and how to select the current output + see :ref:`audio`. + * - __u32 + - ``modulator`` + - Output devices can have zero or more RF modulators. When the + ``type`` is ``V4L2_OUTPUT_TYPE_MODULATOR`` this is an RF connector + and this field identifies the modulator. It corresponds to struct + :c:type:`v4l2_modulator` field ``index``. For + details on modulators see :ref:`tuner`. + * - :ref:`v4l2_std_id <v4l2-std-id>` + - ``std`` + - Every video output supports one or more different video standards. + This field is a set of all supported standards. For details on + video standards and how to switch see :ref:`standard`. + * - __u32 + - ``capabilities`` + - This field provides capabilities for the output. See + :ref:`output-capabilities` for flags. + * - __u32 + - ``reserved``\ [3] + - Reserved for future extensions. Drivers must set the array to + zero. + + + +.. tabularcolumns:: |p{7.0cm}|p{1.8cm}|p{8.7cm}| .. _output-type: @@ -145,33 +107,20 @@ EINVAL. :stub-columns: 0 :widths: 3 1 4 + * - ``V4L2_OUTPUT_TYPE_MODULATOR`` + - 1 + - This output is an analog TV modulator. + * - ``V4L2_OUTPUT_TYPE_ANALOG`` + - 2 + - Analog baseband output, for example Composite / CVBS, S-Video, + RGB. + * - ``V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY`` + - 3 + - [?] - - .. row 1 - - - ``V4L2_OUTPUT_TYPE_MODULATOR`` - - - 1 - - - This output is an analog TV modulator. - - - .. row 2 - - - ``V4L2_OUTPUT_TYPE_ANALOG`` - - - 2 - - - Analog baseband output, for example Composite / CVBS, S-Video, - RGB. - - - .. row 3 - - - ``V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY`` - - - 3 - - - [?] +.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| .. _output-capabilities: @@ -180,34 +129,19 @@ EINVAL. :stub-columns: 0 :widths: 3 1 4 - - - .. row 1 - - - ``V4L2_OUT_CAP_DV_TIMINGS`` - - - 0x00000002 - - - This output supports setting video timings by using - VIDIOC_S_DV_TIMINGS. - - - .. row 2 - - - ``V4L2_OUT_CAP_STD`` - - - 0x00000004 - - - This output supports setting the TV standard by using - VIDIOC_S_STD. - - - .. row 3 - - - ``V4L2_OUT_CAP_NATIVE_SIZE`` - - - 0x00000008 - - - This output supports setting the native size using the - ``V4L2_SEL_TGT_NATIVE_SIZE`` selection target, see - :ref:`v4l2-selections-common`. + * - ``V4L2_OUT_CAP_DV_TIMINGS`` + - 0x00000002 + - This output supports setting video timings by using + VIDIOC_S_DV_TIMINGS. + * - ``V4L2_OUT_CAP_STD`` + - 0x00000004 + - This output supports setting the TV standard by using + VIDIOC_S_STD. + * - ``V4L2_OUT_CAP_NATIVE_SIZE`` + - 0x00000008 + - This output supports setting the native size using the + ``V4L2_SEL_TGT_NATIVE_SIZE`` selection target, see + :ref:`v4l2-selections-common`. Return Value @@ -218,5 +152,5 @@ appropriately. The generic error codes are described at the :ref:`Generic Error Codes <gen-errors>` chapter. EINVAL - The struct :ref:`v4l2_output <v4l2-output>` ``index`` is out of + The struct :c:type:`v4l2_output` ``index`` is out of bounds. |