<title>DVB Video Device</title>
<para>The DVB video device controls the MPEG2 video decoder of the DVB hardware. It
can be accessed through <emphasis role="tt">/dev/dvb/adapter0/video0</emphasis>. Data types and and
ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/video.h</emphasis> in your
application.
</para>
<para>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. <emphasis role="tt">/dev/video</emphasis>, which allows scaling and defining output
windows.
</para>
<para>Some 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.
</para>
<para>The ioctls that deal with SPUs (sub picture units) and navigation packets are only
supported on some MPEG decoders made for DVD playback.
</para>
<section id="video_types">
<title>Video Data Types</title>
<section id="video-format-t">
<title>video_format_t</title>
<para>The <emphasis role="tt">video_format_t</emphasis> data type defined by
</para>
<programlisting>
typedef enum {
VIDEO_FORMAT_4_3, /⋆ Select 4:3 format ⋆/
VIDEO_FORMAT_16_9, /⋆ Select 16:9 format. ⋆/
VIDEO_FORMAT_221_1 /⋆ 2.21:1 ⋆/
} video_format_t;
</programlisting>
<para>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.
</para>
</section>
<section id="video-displayformat-t">
<title>video_displayformat_t</title>
<para>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
</para>
<programlisting>
typedef enum {
VIDEO_PAN_SCAN, /⋆ use pan and scan format ⋆/
VIDEO_LETTER_BOX, /⋆ use letterbox format ⋆/
VIDEO_CENTER_CUT_OUT /⋆ use center cut out format ⋆/
} video_displayformat_t;
</programlisting>
<para>as argument.
</para>
</section>
<section id="video-stream-source-t">
<title>video stream source</title>
<para>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.
</para>
<programlisting>
typedef enum {
VIDEO_SOURCE_DEMUX, /⋆ 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 ⋆/
} video_stream_source_t;
</programlisting>
<para>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 <emphasis role="tt">write()</emphasis> system
call.
</para>
</section>
<section id="video-play-state-t">
<title>video play state</title>
<para>The following values can be returned by the VIDEO_GET_STATUS call representing the
state of video playback.
</para>
<programlisting>
typedef enum {
VIDEO_STOPPED, /⋆ Video is stopped ⋆/
VIDEO_PLAYING, /⋆ Video is currently playing ⋆/
VIDEO_FREEZED /⋆ Video is freezed ⋆/
} video_play_state_t;
</programlisting>
</section>
<section id="video-command">
<para>The structure must be zeroed before use by the application
This ensures it can be extended safely in the future.</para>
<title>struct video-command</title>
<programlisting>
struct video_command {
__u32 cmd;
__u32 flags;
union {
struct {
__u64 pts;
} stop;
struct {
/⋆ 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. ⋆/
__s32 speed;
__u32 format;
} play;
struct {
__u32 data[16];
} raw;
};
};
</programlisting>
</section>
<section id="video-size-t">
<title>struct video_size-t</title>
<programlisting>
typedef struct {
int w;
int h;
video_format_t aspect_ratio;
} video_size_t;
</programlisting>
</section>
<section id="video-event">
<title>struct video_event</title>
<para>The following is the structure of a video event as it is returned by the VIDEO_GET_EVENT
call.
</para>
<programlisting>
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
__kernel_time_t timestamp;
union {
video_size_t size;
unsigned int frame_rate; /⋆ in frames per 1000sec ⋆/
unsigned char vsync_field; /⋆ unknown/odd/even/progressive ⋆/
} u;
};
</programlisting>
</section>
<section id="video-status">
<title>struct video_status</title>
<para>The VIDEO_GET_STATUS call returns the following structure informing about various
states of the playback operation.
</para>
<programlisting>
struct video_status {
int video_blank; /⋆ blank video on freeze? ⋆/
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;/⋆ selected cropping mode ⋆/
};
</programlisting>
<para>If video_blank is set 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 seleted
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 selected cropping
mode in case the source video format is not the same as the format of the output
device.
</para>
</section>
<section id="video-still-picture">
<title>struct video_still_picture</title>
<para>An I-frame displayed via the VIDEO_STILLPICTURE call is passed on within the
following structure.
</para>
<programlisting>
/⋆ pointer to and size of a single iframe in memory ⋆/
struct video_still_picture {
char ⋆iFrame; /⋆ pointer to a single iframe in memory ⋆/
int32_t size;
};
</programlisting>
</section>
<section id="video_caps">
<title>video capabilities</title>
<para>A call to VIDEO_GET_CAPABILITIES returns an unsigned integer with the following
bits set according to the hardwares capabilities.
</para>
<programlisting>
/⋆ bit definitions for capabilities: ⋆/
/⋆ can the hardware decode MPEG1 and/or MPEG2? ⋆/
#define VIDEO_CAP_MPEG1 1
#define VIDEO_CAP_MPEG2 2
/⋆ can you send a system and/or program stream to video device?
(you still have to open the video and the audio device but only
send the stream to the video device) ⋆/
#define VIDEO_CAP_SYS 4
#define VIDEO_CAP_PROG 8
/⋆ can the driver also handle SPU, NAVI and CSS encoded data?
(CSS API is not present yet) ⋆/
#define VIDEO_CAP_SPU 16
#define VIDEO_CAP_NAVI 32
#define VIDEO_CAP_CSS 64
</programlisting>
</section>
<section id="video-system">
<title>video system</title>
<para>A call to VIDEO_SET_SYSTEM sets the desired video system for TV output. The
following system types can be set:
</para>
<programlisting>
typedef enum {
VIDEO_SYSTEM_PAL,
VIDEO_SYSTEM_NTSC,
VIDEO_SYSTEM_PALN,
VIDEO_SYSTEM_PALNc,
VIDEO_SYSTEM_PALM,
VIDEO_SYSTEM_NTSC60,
VIDEO_SYSTEM_PAL60,
VIDEO_SYSTEM_PALM60
} video_system_t;
</programlisting>
</section>
<section id="video-highlight">
<title>struct video_highlight</title>
<para>Calling the ioctl VIDEO_SET_HIGHLIGHTS posts the SPU highlight information. The
call expects the following format for that information:
</para>
<programlisting>
typedef
struct video_highlight {
boolean active; /⋆ 1=show highlight, 0=hide highlight ⋆/
uint8_t contrast1; /⋆ 7- 4 Pattern pixel contrast ⋆/
/⋆ 3- 0 Background pixel contrast ⋆/
uint8_t contrast2; /⋆ 7- 4 Emphasis pixel-2 contrast ⋆/
/⋆ 3- 0 Emphasis pixel-1 contrast ⋆/
uint8_t color1; /⋆ 7- 4 Pattern pixel color ⋆/
/⋆ 3- 0 Background pixel color ⋆/
uint8_t color2; /⋆ 7- 4 Emphasis pixel-2 color ⋆/
/⋆ 3- 0 Emphasis pixel-1 color ⋆/
uint32_t ypos; /⋆ 23-22 auto action mode ⋆/
/⋆ 21-12 start y ⋆/
/⋆ 9- 0 end y ⋆/
uint32_t xpos; /⋆ 23-22 button color number ⋆/
/⋆ 21-12 start x ⋆/
/⋆ 9- 0 end x ⋆/
} video_highlight_t;
</programlisting>
</section>
<section id="video-spu">
<title>video SPU</title>
<para>Calling VIDEO_SET_SPU deactivates or activates SPU decoding, according to the
following format:
</para>
<programlisting>
typedef
struct video_spu {
boolean active;
int stream_id;
} video_spu_t;
</programlisting>
</section>
<section id="video-spu-palette">
<title>video SPU palette</title>
<para>The following structure is used to set the SPU palette by calling VIDEO_SPU_PALETTE:
</para>
<programlisting>
typedef
struct video_spu_palette{
int length;
uint8_t ⋆palette;
} video_spu_palette_t;
</programlisting>
</section>
<section id="video-navi-pack">
<title>video NAVI pack</title>
<para>In order to get the navigational data the following structure has to be passed to the ioctl
VIDEO_GET_NAVI:
</para>
<programlisting>
typedef
struct video_navi_pack{
int length; /⋆ 0 ... 1024 ⋆/
uint8_t data[1024];
} video_navi_pack_t;
</programlisting>
</section>
<section id="video-attributes-t">
<title>video attributes</title>
<para>The following attributes can be set by a call to VIDEO_SET_ATTRIBUTES:
</para>
<programlisting>
typedef uint16_t video_attributes_t;
/⋆ bits: descr. ⋆/
/⋆ 15-14 Video compression mode (0=MPEG-1, 1=MPEG-2) ⋆/
/⋆ 13-12 TV system (0=525/60, 1=625/50) ⋆/
/⋆ 11-10 Aspect ratio (0=4:3, 3=16:9) ⋆/
/⋆ 9- 8 permitted display mode on 4:3 monitor (0=both, 1=only pan-sca ⋆/
/⋆ 7 line 21-1 data present in GOP (1=yes, 0=no) ⋆/
/⋆ 6 line 21-2 data present in GOP (1=yes, 0=no) ⋆/
/⋆ 5- 3 source resolution (0=720x480/576, 1=704x480/576, 2=352x480/57 ⋆/
/⋆ 2 source letterboxed (1=yes, 0=no) ⋆/
/⋆ 0 film/camera mode (0=camera, 1=film (625/50 only)) ⋆/
</programlisting>
</section></section>
<section id="video_function_calls">
<title>Video Function Calls</title>
<section id="video_fopen">
<title>open()</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This system call opens a named video device (e.g. /dev/dvb/adapter0/video0)
for subsequent use.</para>
<para>When an open() call has succeeded, the device will be ready for use.
The significance of blocking or non-blocking mode is described in the
documentation for functions where there is a difference. It does not affect the
semantics of the open() call itself. A device opened in blocking mode can later
be put into non-blocking mode (and vice versa) using the F_SETFL command
of the fcntl system call. This is a standard system call, documented in the Linux
manual page for fcntl. Only one user can open the Video Device in O_RDWR
mode. All other attempts to open the device in this mode will fail, and an
error-code will be returned. If the Video Device is opened in O_RDONLY
mode, the only ioctl call that can be used is VIDEO_GET_STATUS. All other
call will return an error code.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int open(const char ⋆deviceName, int flags);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>const char
*deviceName</para>
</entry><entry
align="char">
<para>Name of specific video device.</para>
</entry>
</row><row><entry
align="char">
<para>int flags</para>
</entry><entry
align="char">
<para>A bit-wise OR of the following flags:</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>O_RDONLY read-only access</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>O_RDWR read/write access</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>O_NONBLOCK open in non-blocking mode</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>(blocking mode is the default)</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>RETURN VALUE</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>ENODEV</para>
</entry><entry
align="char">
<para>Device driver not loaded/available.</para>
</entry>
</row><row><entry
align="char">
<para>EINTERNAL</para>
</entry><entry
align="char">
<para>Internal error.</para>
</entry>
</row><row><entry
align="char">
<para>EBUSY</para>
</entry><entry
align="char">
<para>Device or resource busy.</para>
</entry>
</row><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>Invalid argument.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section>
<section id="video_fclose">
<title>close()</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This system call closes a previously opened video device.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int close(int fd);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>RETURN VALUE</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EBADF</para>
</entry><entry
align="char">
<para>fd is not a valid open file descriptor.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section>
<section id="video_fwrite">
<title>write()</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This system call can only be used if VIDEO_SOURCE_MEMORY is selected
in the ioctl call VIDEO_SELECT_SOURCE. The data provided shall be in
PES format, unless the capability allows other formats. If O_NONBLOCK is
not specified the function will block until buffer space is available. The amount
of data to be transferred is implied by count.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>size_t write(int fd, const void ⋆buf, size_t count);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>void *buf</para>
</entry><entry
align="char">
<para>Pointer to the buffer containing the PES data.</para>
</entry>
</row><row><entry
align="char">
<para>size_t count</para>
</entry><entry
align="char">
<para>Size of buf.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>RETURN VALUE</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EPERM</para>
</entry><entry
align="char">
<para>Mode VIDEO_SOURCE_MEMORY not selected.</para>
</entry>
</row><row><entry
align="char">
<para>ENOMEM</para>
</entry><entry
align="char">
<para>Attempted to write more data than the internal buffer can
hold.</para>
</entry>
</row><row><entry
align="char">
<para>EBADF</para>
</entry><entry
align="char">
<para>fd is not a valid open file descriptor.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_STOP"
role="subsection"><title>VIDEO_STOP</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to stop playing the current stream.
Depending on the input parameter, the screen can be blanked out or displaying
the last decoded frame.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_STOP, boolean
mode);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_STOP for this command.</para>
</entry>
</row><row><entry
align="char">
<para>Boolean mode</para>
</entry><entry
align="char">
<para>Indicates how the screen shall be handled.</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>TRUE: Blank screen when stop.</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>FALSE: Show last decoded frame.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_PLAY"
role="subsection"><title>VIDEO_PLAY</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to start playing a video stream from the
selected source.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_PLAY);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_PLAY for this command.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_FREEZE"
role="subsection"><title>VIDEO_FREEZE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call suspends the live video stream being played. Decoding
and playing are frozen. It is then possible to restart the decoding
and playing process of the video stream using the VIDEO_CONTINUE
command. If VIDEO_SOURCE_MEMORY is selected in the ioctl call
VIDEO_SELECT_SOURCE, the DVB subsystem will not decode any more
data until the ioctl call VIDEO_CONTINUE or VIDEO_PLAY is performed.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_FREEZE);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_FREEZE for this command.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_CONTINUE"
role="subsection"><title>VIDEO_CONTINUE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call restarts decoding and playing processes of the video stream
which was played before a call to VIDEO_FREEZE was made.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_CONTINUE);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_CONTINUE for this command.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SELECT_SOURCE"
role="subsection"><title>VIDEO_SELECT_SOURCE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call informs the video device which source shall be used for the input
data. The possible sources are demux or memory. If memory is selected, the
data is fed to the video device through the write command.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_SELECT_SOURCE,
video_stream_source_t source);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SELECT_SOURCE for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_stream_source_t
source</para>
</entry><entry
align="char">
<para>Indicates which source shall be used for the Video stream.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SET_BLANK"
role="subsection"><title>VIDEO_SET_BLANK</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to blank out the picture.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_SET_BLANK, boolean
mode);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_BLANK for this command.</para>
</entry>
</row><row><entry
align="char">
<para>boolean mode</para>
</entry><entry
align="char">
<para>TRUE: Blank screen when stop.</para>
</entry>
</row><row><entry
align="char">
</entry><entry
align="char">
<para>FALSE: Show last decoded frame.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_GET_STATUS"
role="subsection"><title>VIDEO_GET_STATUS</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to return the current status of the device.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_GET_STATUS, struct
video_status ⋆status);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_GET_STATUS for this command.</para>
</entry>
</row><row><entry
align="char">
<para>struct video_status
*status</para>
</entry><entry
align="char">
<para>Returns the current status of the Video Device.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_GET_EVENT"
role="subsection"><title>VIDEO_GET_EVENT</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call returns an event of type video_event if available. If an event is
not available, the behavior depends on whether the device is in blocking or
non-blocking mode. In the latter case, the call fails immediately with errno
set to EWOULDBLOCK. In the former case, the call blocks until an event
becomes available. The standard Linux poll() and/or select() system calls can
be used with the device file descriptor to watch for new events. For select(),
the file descriptor should be included in the exceptfds argument, and for
poll(), POLLPRI should be specified as the wake-up condition. Read-only
permissions are sufficient for this ioctl call.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_GET_EVENT, struct
video_event ⋆ev);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_GET_EVENT for this command.</para>
</entry>
</row><row><entry
align="char">
<para>struct video_event
*ev</para>
</entry><entry
align="char">
<para>Points to the location where the event, if any, is to be
stored.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EWOULDBLOCK</para>
</entry><entry
align="char">
<para>There is no event pending, and the device is in
non-blocking mode.</para>
</entry>
</row><row><entry
align="char">
<para>EOVERFLOW</para>
</entry><entry
align="char">
<para>Overflow in event queue - one or more events were lost.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SET_DISPLAY_FORMAT"
role="subsection"><title>VIDEO_SET_DISPLAY_FORMAT</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to select the video format to be applied
by the MPEG chip on the video.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request =
VIDEO_SET_DISPLAY_FORMAT, video_display_format_t
format);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_DISPLAY_FORMAT for this
command.</para>
</entry>
</row><row><entry
align="char">
<para>video_display_format_t
format</para>
</entry><entry
align="char">
<para>Selects the video format to be used.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_STILLPICTURE"
role="subsection"><title>VIDEO_STILLPICTURE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to display a still picture (I-frame). The
input data shall contain an I-frame. If the pointer is NULL, then the current
displayed still picture is blanked.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_STILLPICTURE,
struct video_still_picture ⋆sp);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_STILLPICTURE for this command.</para>
</entry>
</row><row><entry
align="char">
<para>struct
video_still_picture
*sp</para>
</entry><entry
align="char">
<para>Pointer to a location where an I-frame and size is stored.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_FAST_FORWARD"
role="subsection"><title>VIDEO_FAST_FORWARD</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the Video Device to skip decoding of N number of I-frames.
This call can only be used if VIDEO_SOURCE_MEMORY is selected.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_FAST_FORWARD, int
nFrames);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_FAST_FORWARD for this command.</para>
</entry>
</row><row><entry
align="char">
<para>int nFrames</para>
</entry><entry
align="char">
<para>The number of frames to skip.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EPERM</para>
</entry><entry
align="char">
<para>Mode VIDEO_SOURCE_MEMORY not selected.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SLOWMOTION"
role="subsection"><title>VIDEO_SLOWMOTION</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the video device to repeat decoding frames N number of
times. This call can only be used if VIDEO_SOURCE_MEMORY is selected.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_SLOWMOTION, int
nFrames);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SLOWMOTION for this command.</para>
</entry>
</row><row><entry
align="char">
<para>int nFrames</para>
</entry><entry
align="char">
<para>The number of times to repeat each frame.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EPERM</para>
</entry><entry
align="char">
<para>Mode VIDEO_SOURCE_MEMORY not selected.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_GET_CAPABILITIES"
role="subsection"><title>VIDEO_GET_CAPABILITIES</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call asks the video device about its decoding capabilities. On success
it returns and integer which has bits set according to the defines in section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_GET_CAPABILITIES,
unsigned int ⋆cap);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_GET_CAPABILITIES for this
command.</para>
</entry>
</row><row><entry
align="char">
<para>unsigned int *cap</para>
</entry><entry
align="char">
<para>Pointer to a location where to store the capability
information.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SET_ID"
role="subsection"><title>VIDEO_SET_ID</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl selects which sub-stream is to be decoded if a program or system
stream is sent to the video device.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(int fd, int request = VIDEO_SET_ID, int
id);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_ID for this command.</para>
</entry>
</row><row><entry
align="char">
<para>int id</para>
</entry><entry
align="char">
<para>video sub-stream id</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>Invalid sub-stream id.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_CLEAR_BUFFER"
role="subsection"><title>VIDEO_CLEAR_BUFFER</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl call clears all video buffers in the driver and in the decoder hardware.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_CLEAR_BUFFER);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_CLEAR_BUFFER for this command.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SET_STREAMTYPE"
role="subsection"><title>VIDEO_SET_STREAMTYPE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl tells the driver which kind of stream to expect being written to it. If
this call is not used the default of video PES is used. Some drivers might not
support this call and always expect PES.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>int ioctl(fd, int request = VIDEO_SET_STREAMTYPE,
int type);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_STREAMTYPE for this command.</para>
</entry>
</row><row><entry
align="char">
<para>int type</para>
</entry><entry
align="char">
<para>stream type</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SET_FORMAT"
role="subsection"><title>VIDEO_SET_FORMAT</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl sets the screen format (aspect ratio) of the connected output device
(TV) so that the output of the decoder can be adjusted accordingly.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_FORMAT,
video_format_t format);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_FORMAT for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_format_t
format</para>
</entry><entry
align="char">
<para>video format of TV as defined in section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>format is not a valid video format.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SET_SYSTEM"
role="subsection"><title>VIDEO_SET_SYSTEM</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl sets the television output format. The format (see section ??) may
vary from the color format of the displayed MPEG stream. If the hardware is
not able to display the requested format the call will return an error.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_SYSTEM ,
video_system_t system);</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_FORMAT for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_system_t
system</para>
</entry><entry
align="char">
<para>video system of TV output.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>system is not a valid or supported video system.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SET_HIGHLIGHT"
role="subsection"><title>VIDEO_SET_HIGHLIGHT</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl sets the SPU highlight information for the menu access of a DVD.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_HIGHLIGHT
,video_highlight_t ⋆vhilite)</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_HIGHLIGHT for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_highlight_t
*vhilite</para>
</entry><entry
align="char">
<para>SPU Highlight information according to section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
</section><section id="VIDEO_SET_SPU"
role="subsection"><title>VIDEO_SET_SPU</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl activates or deactivates SPU decoding in a DVD input stream. It can
only be used, if the driver is able to handle a DVD stream.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_SPU ,
video_spu_t ⋆spu)</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_SPU for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_spu_t *spu</para>
</entry><entry
align="char">
<para>SPU decoding (de)activation and subid setting according
to section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>input is not a valid spu setting or driver cannot handle
SPU.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SET_SPU_PALETTE"
role="subsection"><title>VIDEO_SET_SPU_PALETTE</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl sets the SPU color palette.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_SPU_PALETTE
,video_spu_palette_t ⋆palette )</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_SPU_PALETTE for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_spu_palette_t
*palette</para>
</entry><entry
align="char">
<para>SPU palette according to section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>input is not a valid palette or driver doesn’t handle SPU.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_GET_NAVI"
role="subsection"><title>VIDEO_GET_NAVI</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl returns navigational information from the DVD stream. This is
especially needed if an encoded stream has to be decoded by the hardware.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_GET_NAVI ,
video_navi_pack_t ⋆navipack)</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_GET_NAVI for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_navi_pack_t
*navipack</para>
</entry><entry
align="char">
<para>PCI or DSI pack (private stream 2) according to section
??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EFAULT</para>
</entry><entry
align="char">
<para>driver is not able to return navigational information</para>
</entry>
</row></tbody></tgroup></informaltable>
</section><section id="VIDEO_SET_ATTRIBUTES"
role="subsection"><title>VIDEO_SET_ATTRIBUTES</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para>This ioctl is intended for DVD playback and allows you to set certain
information about the stream. Some hardware may not need this information,
but the call also tells the hardware to prepare for DVD playback.</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
align="char">
<para> int ioctl(fd, int request = VIDEO_SET_ATTRIBUTE
,video_attributes_t vattr)</para>
</entry>
</row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>int fd</para>
</entry><entry
align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
</row><row><entry
align="char">
<para>int request</para>
</entry><entry
align="char">
<para>Equals VIDEO_SET_ATTRIBUTE for this command.</para>
</entry>
</row><row><entry
align="char">
<para>video_attributes_t
vattr</para>
</entry><entry
align="char">
<para>video attributes according to section ??.</para>
</entry>
</row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row><entry
align="char">
<para>EINVAL</para>
</entry><entry
align="char">
<para>input is not a valid attribute setting.</para>
</entry>
</row></tbody></tgroup></informaltable>
</section></section>