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</td><td valign="top" width="500"><font color="#ffcc00" face="arial, helvetica"><h2>DVB Video API</h2></font>
<p>
The DVB video device controls the MPEG2 video decoder of the DVB hardware.
It can be accessed through /dev/ost/audio.
</p>
<p>
The include file <a href="video.h">video.h</a> describes the data
types and lists all i/o calls.
A complete explanation of all calls can be found below:
</p>
<p>
<font face="arial, helvetica" size="+1">Video API IO control calls</font>
<p>
<pre>
int open(const char *deviceName, int flags);
FUNCTION
This system call opens a named video device (e.g. /dev/ost/video) for subsequent
use.
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 attemts to
open the device in this mode will fail, and an errorcode 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.
PARAMETERS
const char *deviceName Name of specific video device. In the current
implementation, /dev/ost/video is the only
one available.
int flags A bit-wise OR of the following flags:
O_RDONLY read-only access
O_RDWR read/write access
O_NONBLOCK open in non-blocking mode
(blocking mode is the default)
RETURNS
ENODEV Device driver not loaded/available.
EINTERNAL Internal error, possibly in the communication
with the DVB subsystem.
EBUSY Device or resource busy.
EINVAL Invalid argument.
</pre>
</p>
<p>
<pre>
int close(int fd);
DESCRIPTION
This system call closes a previously opened video device
PARAMETERS
int fd File descriptor returned by a previous call to open().
RETURNS
EBADF fd is not a valid open file descriptor
</pre>
</p>
<p>
<pre>
size_t write(int fd, const void *buf, size_t count);
DESCRIPTION
This system call is only provided if VIDEO_SOURCE_MEMORY is selected in the
ioctl call VIDEO_SELECT_SOURCE. The data provided shall be in PES format.
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.
PARAMETERS
int fd File descriptor returned by a previous call to open().
void *buf Pointer to the buffer containing the PES data.
size_t count Size of buf.
RETURNS
EPERM Mode VIDEO_SOURCE_MEMORY not selected.
ENOMEM Attempted to write more data than the internal buffer can hold.
EBADF fd is not a valid open file descriptor
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_STOP, boolean mode);
FUNCTION
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.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_STOP for this command.
Boolean mode Indicates how the screen shall be handled.
TRUE: Blank screen when stop.
FALSE: Show last decoded frame.
RETURNS
EBADF fd is not a valid open file descriptor
EINTERNAL Internal error, possibly in the communication with
the DVB subsystem.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_PLAY);
FUNCTION
This ioctl call asks the Video Device to start playing a video stream
from the selected source.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_PLAY for this command.
RETURNS
EBADF fd is not a valid open file descriptor
EINTERNAL Internal error, possibly in the communication with
the DVB subsystem.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_FREEZE);
FUNCTION
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
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_FREEZE or VIDEO_PLAY is
performed.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_FREEZE for this command.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error, possibly in the communication with
the DVB subsystem.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_CONTINUE);
FUNCTION
This ioctl call restarts decoding and playing processes of the video
stream which was played before a call to VIDEO_FREEZE was made.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_CONTINUE for this command.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error, possibly in the communication with
the DVB subsystem.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_SELECT_SOURCE, videoStreamSource_t source);
FUNCTION
This ioctl call informs the video device which source shall be used
for the input data. The possible sources are demux or memory. If
internal is selected, the data is feed to the Video Device through
the write command.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_SELECT_SOURCE for this command.
videoStreamSource_t source
Indicates which source shall be used for the Video stream.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error, possibly in the communication with
the DVB subsystem.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_SET_BLANK, boolean mode);
DESCRIPTION
This ioctl call asks the Video Device to blank out the picture.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_SET_BLANK for this command.
boolean mode TRUE: Blank screen when stop.
FALSE: Show last decoded frame.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EINVAL Illegal input parameter.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_GET_STATUS, struct videoStatus *status);
DESCRIPTION
This ioctl call asks the Video Device to return the current status of the device.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_GET_STATUS for this command.
struct videoStatus Returns the current status of the Video Device.
*status
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EFAULT status points to invalid address
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_GET_EVENT, struct videoEvent *ev);
DESCRIPTION
This ioctl call returns an event of type videoEvent 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.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_GET_EVENT for this command.
struct videoEvent *ev Points to the location where the event, if any, is
to be stored.
RETURNS
EBADF fd is not a valid open file descriptor
EFAULT ev points to invalid address
EWOULDBLOCK There is no event pending, and the device is in
non-blocking mode.
EBUFFEROVERFLOW Overflow in event queue - one or more events were lost.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_SET_DISPLAY_FORMAT, videoDisplayFormat_t format);
DESCRIPTION
This ioctl call asks the Video Device to select the video format to be applied
by the MPEG chip on the video.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_SET_DISPLAY_FORMAT for this command.
videoDisplayFormat_t Selects the video format to be used.
format
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EINVAL Illegal parameter format.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_STILLPICTURE, struct videoDisplayStillPicture *sp);
DESCRIPTION
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.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_STILLPICTURE for this command.
struct videoDisplayStillPicture *sp Pointer to a location where an I-frame
and size is stored.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EFAULT sp points to an invalid iframe.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_FAST_FORWARD, int nFrames);
DESCRIPTION
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_INTRENAL is selected.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_FAST_FORWARD for this command.
int nFrames The number of frames to skip.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EPERM Mode VIDEO_SOURCE_MEMORY not selected.
EINVAL Illegal parameter format.
</pre>
</p>
<p>
<pre>
int ioctl(int fd, int request = VIDEO_SLOWMOTION, int nFrames);
DESCRIPTION
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.
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO_SLOWMOTION for this command.
int nFrames The number of frames to skip.
RETURNS
EBADF fd is not a valid open file descriptor.
EINTERNAL Internal error
EPERM Mode VIDEO_SOURCE_MEMORY not selected.
EINVAL Illegal parameter format.
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