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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later OR GPL-2.0
+
+.. c:namespace:: dtv.legacy.video
+
+.. _dvb_video:
+
+================
+DVB Video Device
+================
+
+.. attention:: Do **not** use in new drivers!
+             See: :ref:`legacy_dvb_decoder_notes`
+
+The DVB video device controls the MPEG2 video decoder of the DVB
+hardware. It can be accessed through ``/dev/dvb/adapter0/video0``. Data
+types and ioctl definitions can be accessed by including
+``linux/dvb/video.h`` in your application.
+
+Note that the DVB video device only controls decoding of the MPEG video
+stream, not its presentation on the TV or computer screen. On PCs this
+is typically handled by an associated video4linux device, e.g.
+``/dev/video``, which allows scaling and defining output windows.
+
+Most DVB cards don’t have their own MPEG decoder, which results in the
+omission of the audio and video device as well as the video4linux
+device.
+
+These ioctls were also used by V4L2 to control MPEG decoders implemented
+in V4L2. The use of these ioctls for that purpose has been made obsolete
+and proper V4L2 ioctls or controls have been created to replace that
+functionality. Use :ref:`V4L2 ioctls<video>` for new drivers!
+
+
+Video Data Types
+================
+
+
+
+video_format_t
+--------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    typedef enum {
+	VIDEO_FORMAT_4_3,
+	VIDEO_FORMAT_16_9,
+	VIDEO_FORMAT_221_1
+    } video_format_t;
+
+Constants
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``VIDEO_FORMAT_4_3``
+
+       -  Select 4:3 format.
+
+    -  ..
+
+       -  ``VIDEO_FORMAT_16_9``
+
+       -  Select 16:9 format.
+
+    -  ..
+
+       -  ``VIDEO_FORMAT_221_1``
+
+       -  Select 2.21:1 format.
+
+Description
+~~~~~~~~~~~
+
+The ``video_format_t`` data type
+is used in the `VIDEO_SET_FORMAT`_ function to tell the driver which
+aspect ratio the output hardware (e.g. TV) has. It is also used in the
+data structures `video_status`_ returned by `VIDEO_GET_STATUS`_
+and `video_event`_ returned by `VIDEO_GET_EVENT`_ which report
+about the display format of the current video stream.
+
+
+-----
+
+
+video_displayformat_t
+---------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    typedef enum {
+	VIDEO_PAN_SCAN,
+	VIDEO_LETTER_BOX,
+	VIDEO_CENTER_CUT_OUT
+    } video_displayformat_t;
+
+Constants
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``VIDEO_PAN_SCAN``
+
+       -  Use pan and scan format.
+
+    -  ..
+
+       -  ``VIDEO_LETTER_BOX``
+
+       -  Use letterbox format.
+
+    -  ..
+
+       -  ``VIDEO_CENTER_CUT_OUT``
+
+       -  Use center cut out format.
+
+Description
+~~~~~~~~~~~
+
+In case the display format of the video stream and of the display
+hardware differ the application has to specify how to handle the
+cropping of the picture. This can be done using the
+`VIDEO_SET_DISPLAY_FORMAT`_ call which accepts this enum as argument.
+
+
+-----
+
+
+video_size_t
+------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    typedef struct {
+	int w;
+	int h;
+	video_format_t aspect_ratio;
+    } video_size_t;
+
+Variables
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``int w``
+
+       -  Video width in pixels.
+
+    -  ..
+
+       -  ``int h``
+
+       -  Video height in pixels.
+
+    -  ..
+
+       -  `video_format_t`_ ``aspect_ratio``
+
+       -  Aspect ratio.
+
+Description
+~~~~~~~~~~~
+
+Used in the struct `video_event`_. It stores the resolution and
+aspect ratio of the video.
+
+
+-----
+
+
+video_stream_source_t
+---------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    typedef enum {
+	VIDEO_SOURCE_DEMUX,
+	VIDEO_SOURCE_MEMORY
+    } video_stream_source_t;
+
+Constants
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``VIDEO_SOURCE_DEMUX``
+
+       -  :cspan:`1` Select the demux as the main source.
+
+    -  ..
+
+       -  ``VIDEO_SOURCE_MEMORY``
+
+       -  If this source is selected, the stream
+          comes from the user through the write
+          system call.
+
+Description
+~~~~~~~~~~~
+
+The video stream source is set through the `VIDEO_SELECT_SOURCE`_ call
+and can take the following values, depending on whether we are replaying
+from an internal (demuxer) or external (user write) source.
+VIDEO_SOURCE_DEMUX selects the demultiplexer (fed either by the
+frontend or the DVR device) as the source of the video stream. If
+VIDEO_SOURCE_MEMORY is selected the stream comes from the application
+through the `write()`_ system call.
+
+
+-----
+
+
+video_play_state_t
+------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    typedef enum {
+	VIDEO_STOPPED,
+	VIDEO_PLAYING,
+	VIDEO_FREEZED
+    } video_play_state_t;
+
+Constants
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``VIDEO_STOPPED``
+
+       -  Video is stopped.
+
+    -  ..
+
+       -  ``VIDEO_PLAYING``
+
+       -  Video is currently playing.
+
+    -  ..
+
+       -  ``VIDEO_FREEZED``
+
+       -  Video is frozen.
+
+Description
+~~~~~~~~~~~
+
+This values can be returned by the `VIDEO_GET_STATUS`_ call
+representing the state of video playback.
+
+
+-----
+
+
+struct video_command
+--------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    struct video_command {
+	__u32 cmd;
+	__u32 flags;
+	union {
+	    struct {
+		__u64 pts;
+	    } stop;
+
+	    struct {
+		__s32 speed;
+		__u32 format;
+	    } play;
+
+	    struct {
+		__u32 data[16];
+	    } raw;
+	};
+    };
+
+
+Variables
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``__u32 cmd``
+
+       -  `Decoder command`_
+
+    -  ..
+
+       -  ``__u32 flags``
+
+       -  Flags for the `Decoder command`_.
+
+    -  ..
+
+       -  ``struct stop``
+
+       -  ``__u64 pts``
+
+       -  MPEG PTS
+
+    -  ..
+
+       -  :rspan:`5` ``stuct play``
+
+       -  :rspan:`4` ``__s32 speed``
+
+       -   0 or 1000 specifies normal speed,
+
+    -  ..
+
+       -   1:  specifies forward single stepping,
+
+    -  ..
+
+       -   -1: specifies backward single stepping,
+
+    -  ..
+
+       -   >1: playback at speed / 1000 of the normal speed
+
+    -  ..
+
+       -   <-1: reverse playback at ( -speed / 1000 ) of the normal speed.
+
+    -  ..
+
+       -  ``__u32 format``
+
+       -  `Play input formats`_
+
+    -  ..
+
+       -  ``__u32 data[16]``
+
+       -  Reserved
+
+Description
+~~~~~~~~~~~
+
+The structure must be zeroed before use by the application. This ensures
+it can be extended safely in the future.
+
+
+-----
+
+
+Predefined decoder commands and flags
+-------------------------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    #define VIDEO_CMD_PLAY                      (0)
+    #define VIDEO_CMD_STOP                      (1)
+    #define VIDEO_CMD_FREEZE                    (2)
+    #define VIDEO_CMD_CONTINUE                  (3)
+
+    #define VIDEO_CMD_FREEZE_TO_BLACK      (1 << 0)
+
+    #define VIDEO_CMD_STOP_TO_BLACK        (1 << 0)
+    #define VIDEO_CMD_STOP_IMMEDIATELY     (1 << 1)
+
+    #define VIDEO_PLAY_FMT_NONE                 (0)
+    #define VIDEO_PLAY_FMT_GOP                  (1)
+
+    #define VIDEO_VSYNC_FIELD_UNKNOWN           (0)
+    #define VIDEO_VSYNC_FIELD_ODD               (1)
+    #define VIDEO_VSYNC_FIELD_EVEN              (2)
+    #define VIDEO_VSYNC_FIELD_PROGRESSIVE       (3)
+
+Constants
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  :rspan:`3` _`Decoder command`
+
+       -  ``VIDEO_CMD_PLAY``
+
+       -  Start playback.
+
+    -  ..
+
+       -  ``VIDEO_CMD_STOP``
+
+       -  Stop playback.
+
+    -  ..
+
+       -  ``VIDEO_CMD_FREEZE``
+
+       -  Freeze playback.
+
+    -  ..
+
+       -  ``VIDEO_CMD_CONTINUE``
+
+       -  Continue playback after freeze.
+
+    -  ..
+
+       -  Flags for ``VIDEO_CMD_FREEZE``
+
+       -  ``VIDEO_CMD_FREEZE_TO_BLACK``
+
+       -  Show black picture on freeze.
+
+    -  ..
+
+       -  :rspan:`1` Flags for ``VIDEO_CMD_STOP``
+
+       -  ``VIDEO_CMD_STOP_TO_BLACK``
+
+       -  Show black picture on stop.
+
+    -  ..
+
+       -  ``VIDEO_CMD_STOP_IMMEDIATELY``
+
+       -  Stop immediately, without emptying buffers.
+
+    -  ..
+
+       -  :rspan:`1` _`Play input formats`
+
+       -  ``VIDEO_PLAY_FMT_NONE``
+
+       -  The decoder has no special format requirements
+
+    -  ..
+
+       -  ``VIDEO_PLAY_FMT_GOP``
+
+       -  The decoder requires full GOPs
+
+    -  ..
+
+       -  :rspan:`3` Field order
+
+       -  ``VIDEO_VSYNC_FIELD_UNKNOWN``
+
+       -  FIELD_UNKNOWN can be used if the hardware does not know
+          whether the Vsync is for an odd, even or progressive
+          (i.e. non-interlaced) field.
+
+    -  ..
+
+       -  ``VIDEO_VSYNC_FIELD_ODD``
+
+       -  Vsync is for an odd field.
+
+    -  ..
+
+       -  ``VIDEO_VSYNC_FIELD_EVEN``
+
+       -  Vsync is for an even field.
+
+    -  ..
+
+       -  ``VIDEO_VSYNC_FIELD_PROGRESSIVE``
+
+       -  progressive (i.e. non-interlaced)
+
+
+-----
+
+
+video_event
+-----------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    struct video_event {
+	__s32 type;
+    #define VIDEO_EVENT_SIZE_CHANGED        1
+    #define VIDEO_EVENT_FRAME_RATE_CHANGED  2
+    #define VIDEO_EVENT_DECODER_STOPPED     3
+    #define VIDEO_EVENT_VSYNC               4
+	long timestamp;
+	union {
+	    video_size_t size;
+	    unsigned int frame_rate;
+	    unsigned char vsync_field;
+	} u;
+    };
+
+Variables
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  :rspan:`4` ``__s32 type``
+
+       -  :cspan:`1` Event type.
+
+    -  ..
+
+       -  ``VIDEO_EVENT_SIZE_CHANGED``
+
+       -  Size changed.
+
+    -  ..
+
+       -  ``VIDEO_EVENT_FRAME_RATE_CHANGED``
+
+       -  Framerate changed.
+
+    -  ..
+
+       -  ``VIDEO_EVENT_DECODER_STOPPED``
+
+       -  Decoder stopped.
+
+    -  ..
+
+       -  ``VIDEO_EVENT_VSYNC``
+
+       -  Vsync occurred.
+
+    -  ..
+
+       -  ``long timestamp``
+
+       -  :cspan:`1` MPEG PTS at occurrence.
+
+    -  ..
+
+       -  :rspan:`2` ``union u``
+
+       -  `video_size_t`_ size
+
+       -  Resolution and aspect ratio of the video.
+
+    -  ..
+
+       -  ``unsigned int frame_rate``
+
+       -  in frames per 1000sec
+
+    -  ..
+
+       -  ``unsigned char vsync_field``
+
+       -  | unknown / odd / even / progressive
+          | See: `Predefined decoder commands and flags`_
+
+Description
+~~~~~~~~~~~
+
+This is the structure of a video event as it is returned by the
+`VIDEO_GET_EVENT`_ call. See there for more details.
+
+
+-----
+
+
+video_status
+------------
+
+Synopsis
+~~~~~~~~
+
+The `VIDEO_GET_STATUS`_ call returns the following structure informing
+about various states of the playback operation.
+
+.. code-block:: c
+
+    struct video_status {
+	int                    video_blank;
+	video_play_state_t     play_state;
+	video_stream_source_t  stream_source;
+	video_format_t         video_format;
+	video_displayformat_t  display_format;
+    };
+
+Variables
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  :rspan:`2` ``int video_blank``
+
+       -  :cspan:`1` Show blank video on freeze?
+
+    -  ..
+
+       -  TRUE  ( != 0 )
+
+       -  Blank screen when freeze.
+
+    -  ..
+
+       -  FALSE ( == 0 )
+
+       -  Show last decoded frame.
+
+    -  ..
+
+       -  `video_play_state_t`_ ``play_state``
+
+       -  Current state of playback.
+
+    -  ..
+
+       -  `video_stream_source_t`_ ``stream_source``
+
+       -  Current source (demux/memory).
+
+    -  ..
+
+       -  `video_format_t`_ ``video_format``
+
+       -  Current aspect ratio of stream.
+
+    -  ..
+
+       -  `video_displayformat_t`_ ``display_format``
+
+       -  Applied cropping mode.
+
+Description
+~~~~~~~~~~~
+
+If ``video_blank`` is set ``TRUE`` video will be blanked out if the
+channel is changed or if playback is stopped. Otherwise, the last picture
+will be displayed. ``play_state`` indicates if the video is currently
+frozen, stopped, or being played back. The ``stream_source`` corresponds
+to the selected source for the video stream. It can come either from the
+demultiplexer or from memory. The ``video_format`` indicates the aspect
+ratio (one of 4:3 or 16:9) of the currently played video stream.
+Finally, ``display_format`` corresponds to the applied cropping mode in
+case the source video format is not the same as the format of the output
+device.
+
+
+-----
+
+
+video_still_picture
+-------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    struct video_still_picture {
+    char *iFrame;
+    int32_t size;
+    };
+
+Variables
+~~~~~~~~~
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``char *iFrame``
+
+       -  Pointer to a single iframe in memory.
+
+    -  ..
+
+       -  ``int32_t size``
+
+       -  Size of the iframe.
+
+
+Description
+~~~~~~~~~~~
+
+An I-frame displayed via the `VIDEO_STILLPICTURE`_ call is passed on
+within this structure.
+
+
+-----
+
+
+video capabilities
+------------------
+
+Synopsis
+~~~~~~~~
+
+.. code-block:: c
+
+    #define VIDEO_CAP_MPEG1   1
+    #define VIDEO_CAP_MPEG2   2
+    #define VIDEO_CAP_SYS     4
+    #define VIDEO_CAP_PROG    8
+
+Constants
+~~~~~~~~~
+Bit definitions for capabilities:
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  ..
+
+       -  ``VIDEO_CAP_MPEG1``
+
+       -  :cspan:`1` The hardware can decode MPEG1.
+
+    -  ..
+
+       -  ``VIDEO_CAP_MPEG2``
+
+       -  The hardware can decode MPEG2.
+
+    -  ..
+
+       -  ``VIDEO_CAP_SYS``
+
+       -  The video device accepts system stream.
+
+          You still have to open the video and the audio device
+          but only send the stream to the video device.
+
+    -  ..
+
+       -  ``VIDEO_CAP_PROG``
+
+       -  The video device accepts program stream.
+
+          You still have to open the video and the audio device
+          but only send the stream to the video device.
+
+Description
+~~~~~~~~~~~
+
+A call to `VIDEO_GET_CAPABILITIES`_ returns an unsigned integer with the
+following bits set according to the hardware's capabilities.
