Unit Video
From Ultibo.org
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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
Video specific constants
VIDEO_* VIDEO_NAME_PREFIX = 'Video';
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Name prefix for Video Devices |
Video device types
VIDEO_TYPE_* VIDEO_TYPE_NONE = 0;
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Video device states
VIDEO_STATE_* VIDEO_STATE_DISABLED = 0;
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VIDEO_STATE_ENABLED = 1;
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Video device flags
VIDEO_FLAG_* VIDEO_FLAG_NONE = $00000000;
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Video logging
VIDEO_LOG_* VIDEO_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG;
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Video debugging messages |
VIDEO_LOG_LEVEL_INFO = LOG_LEVEL_INFO;
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Video informational messages, such as a device being attached or detached |
VIDEO_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR;
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Video error messages |
VIDEO_LOG_LEVEL_NONE = LOG_LEVEL_NONE;
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No Video messages |
Type definitions
Video properties
PVideoProperties = ^TVideoProperties;
TVideoProperties = record
Flags:LongWord;
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Device flags (eg VIDEO_FLAG_????) |
Video enumeration callback
TVideoEnumerate = function(Video:PVideoDevice; Data:Pointer):LongWord;
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Video notification callback
TVideoNotification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;
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Video device get properties
TVideoDeviceGetProperties = function(Video:PVideoDevice; Properties:PVideoProperties):LongWord;
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Video device
PVideoDevice = ^TVideoDevice;
TVideoDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Video device |
| Video Properties | |
VideoId:LongWord;
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Unique Id of this Video device in the Video device table |
VideoState:LongWord;
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Video device state (eg VIDEO_STATE_ENABLED) |
DeviceGetProperties:TVideoDeviceGetProperties;
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A Device specific DeviceGetProperties method implementing the standard Video device interface (Or nil if the default method is suitable) |
| Statistics Properties | |
| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Properties:TVideoProperties;
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Device properties |
| Internal Properties | |
Prev:PVideoDevice;
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Previous entry in Video device table |
Next:PVideoDevice;
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Next entry in Video device table |
Public variables
Video logging
VIDEO_DEFAULT_LOG_LEVEL:LongWord = VIDEO_LOG_LEVEL_DEBUG;
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Minimum level for Video messages. Only messages with level greater than or equal to this will be printed. |
VIDEO_LOG_ENABLED:Boolean;
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Function declarations
Initialization functions
procedure VideoInit;
Description: Initialize the Video unit and Video device table
| Note | Called only during system startup |
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Video device functions
function VideoDeviceGetProperties(Video:PVideoDevice; Properties:PVideoProperties):LongWord;
Description: Get the properties for the specified Video device
| Video | The Video device to get properties from |
|---|---|
| Properties | Pointer to a TVideoProperties structure to fill in |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function VideoDeviceCreate:PVideoDevice;
Description: Create a new Video device entry
| Return | Pointer to new Video device entry or nil if Video device could not be created |
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function VideoDeviceCreateEx(Size:LongWord):PVideoDevice;
Description: Create a new Video device entry
| Size | Size in bytes to allocate for new Video device (Including the Video device entry) |
|---|---|
| Return | Pointer to new Video device entry or nil if Video device could not be created |
function VideoDeviceDestroy(Video:PVideoDevice):LongWord;
Description: Destroy an existing Video device entry
| Note | None documented |
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function VideoDeviceRegister(Video:PVideoDevice):LongWord;
Description: Register a new Video device in the Video device table
| Note | None documented |
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function VideoDeviceDeregister(Video:PVideoDevice):LongWord;
Description: Deregister a Video device from the Video device table
| Note | None documented |
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function VideoDeviceFind(VideoId:LongWord):PVideoDevice;
Description: To be documented
| Note | None documented |
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function VideoDeviceFindByName(const Name:String):PVideoDevice; inline;
Description: To be documented
| Note | None documented |
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function VideoDeviceFindByDescription(const Description:String):PVideoDevice; inline;
Description: To be documented
| Note | None documented |
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function VideoDeviceEnumerate(Callback:TVideoEnumerate; Data:Pointer):LongWord;
Description: To be documented
| Note | None documented |
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function VideoDeviceNotification(Video:PVideoDevice; Callback:TVideoNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented
| Note | None documented |
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Video helper functions
function VideoGetCount:LongWord; inline;
Description: Get the current Video device count
| Note | None documented |
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function VideoDeviceGetDefault:PVideoDevice; inline;
Description: Get the current default Video device
| Note | None documented |
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function VideoDeviceSetDefault(Video:PVideoDevice):LongWord;
Description: Set the current default Video device
| Note | None documented |
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function VideoDeviceCheck(Video:PVideoDevice):PVideoDevice;
Description: Check if the supplied Video device is in the Video device table
| Note | None documented |
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procedure VideoLog(Level:LongWord; Video:PVideoDevice; const AText:String);
Description: To be documented
| Note | None documented |
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procedure VideoLogInfo(Video:PVideoDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure VideoLogError(Video:PVideoDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure VideoLogDebug(Video:PVideoDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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