Difference between revisions of "Unit Video"

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<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Get the current default Video device</div>
 
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Latest revision as of 02:32, 15 December 2022

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Description

Ultibo Video Interface unit

This unit provides both the Video device interface and the generic USB video device driver.

Constants


[Expand]
Video specific constants VIDEO_*


[Expand]
Video device types VIDEO_TYPE_*


[Expand]
Video device states VIDEO_STATE_*


[Expand]
Video device flags VIDEO_FLAG_*


[Expand]
Video logging VIDEO_LOG_*


Type definitions


Video properties

[Expand]

PVideoProperties = ^TVideoProperties;

TVideoProperties = record

Video enumeration callback

TVideoEnumerate = function(Video:PVideoDevice; Data:Pointer):LongWord;

Video notification callback

TVideoNotification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;

Video device get properties

TVideoDeviceGetProperties = function(Video:PVideoDevice; Properties:PVideoProperties):LongWord;

Video device

[Expand]

PVideoDevice = ^TVideoDevice;

TVideoDevice = record


Public variables


Video logging

VIDEO_DEFAULT_LOG_LEVEL:LongWord = VIDEO_LOG_LEVEL_DEBUG; Minimum level for Video messages. Only messages with level greater than or equal to this will be printed.
VIDEO_LOG_ENABLED:Boolean;


Function declarations


Initialization functions

[Expand] 
procedure VideoInit;
Description: Initialize the Video unit and Video device table


Video device functions

[Expand] 
function VideoDeviceGetProperties(Video:PVideoDevice; Properties:PVideoProperties):LongWord;
Description: Get the properties for the specified Video device


[Expand] 
function VideoDeviceCreate:PVideoDevice;
Description: Create a new Video device entry


[Expand] 
function VideoDeviceCreateEx(Size:LongWord):PVideoDevice;
Description: Create a new Video device entry


[Expand] 
function VideoDeviceDestroy(Video:PVideoDevice):LongWord;
Description: Destroy an existing Video device entry


[Expand] 
function VideoDeviceRegister(Video:PVideoDevice):LongWord;
Description: Register a new Video device in the Video device table


[Expand] 
function VideoDeviceDeregister(Video:PVideoDevice):LongWord;
Description: Deregister a Video device from the Video device table


[Expand] 
function VideoDeviceFind(VideoId:LongWord):PVideoDevice;
Description: To be documented


[Expand] 
function VideoDeviceFindByName(const Name:String):PVideoDevice; inline;
Description: To be documented


[Expand] 
function VideoDeviceFindByDescription(const Description:String):PVideoDevice; inline;
Description: To be documented


[Expand] 
function VideoDeviceEnumerate(Callback:TVideoEnumerate; Data:Pointer):LongWord;
Description: To be documented


[Expand] 
function VideoDeviceNotification(Video:PVideoDevice; Callback:TVideoNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented


Video helper functions

[Expand] 
function VideoGetCount:LongWord;
Description: Get the current Video device count


[Expand] 
function VideoDeviceGetDefault:PVideoDevice;
Description: Get the current default Video device


[Expand] 
function VideoDeviceSetDefault(Video:PVideoDevice):LongWord;
Description: Set the current default Video device


[Expand] 
function VideoDeviceCheck(Video:PVideoDevice):PVideoDevice;
Description: Check if the supplied Video device is in the Video device table


[Expand] 
procedure VideoLog(Level:LongWord; Video:PVideoDevice; const AText:String);
Description: To be documented


[Expand] 
procedure VideoLogInfo(Video:PVideoDevice; const AText:String); inline;
Description: To be documented


[Expand] 
procedure VideoLogWarn(Video:PVideoDevice; const AText:String); inline;
Description: To be documented


[Expand] 
procedure VideoLogError(Video:PVideoDevice; const AText:String); inline;
Description: To be documented


[Expand] 
procedure VideoLogDebug(Video:PVideoDevice; const AText:String); inline;
Description: To be documented


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