Unit Codec
From Ultibo.org
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Description
Ultibo Codec interface unit
To be documented
Constants
Codec specific constants
CODEC_* CODEC_NAME_PREFIX = 'Codec';
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Name prefix for Codec Devices |
Codec device type constants
CODEC_TYPE_* CODEC_TYPE_NONE = 0;
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Codec device state constants
CODEC_STATE_* CODEC_STATE_DISABLED = 0;
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CODEC_STATE_ENABLED = 1;
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Codec device flag constants
CODEC_FLAG_* CODEC_FLAG_NONE = $00000000;
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Codec logging constants
CODEC_LOG_* CODEC_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG;
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Codec debugging messages |
CODEC_LOG_LEVEL_INFO = LOG_LEVEL_INFO;
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Codec informational messages, such as a device being attached or detached |
CODEC_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR;
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Codec error messages |
CODEC_LOG_LEVEL_NONE = LOG_LEVEL_NONE;
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No Codec messages |
Type definitions
Codec properties
PCodecProperties = ^TCodecProperties; TCodecProperties = record
Flags:LongWord;
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Device flags (eg CODEC_FLAG_????) |
Codec enumeration callback
TCodecEnumerate = function(Codec:PCodecDevice;Data:Pointer):LongWord;
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Codec notification callback
TCodecNotification = function(Device:PDevice;Data:Pointer;Notification:LongWord):LongWord;
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Codec device properties
TCodecDeviceProperties = function(Codec:PCodecDevice;Properties:PCodecProperties):LongWord;
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Codec device
PCodecDevice = ^TCodecDevice;
TCodecDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Codec device |
| Codec Properties | |
CodecId:LongWord;
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Unique Id of this Codec device in the Codec device table |
CodecState:LongWord;
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Codec dveice state (eg CODEC_STATE_ENABLED) |
DeviceProperties:TCodecDeviceProperties;
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A Device specific DeviceProperties method implementing the standard Codec device interface (Or nil if the default method is suitable) |
| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Properties:TCodecProperties;
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Device properties |
| Internal Properties | |
Prev:PCodecDevice;
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Previous entry in Codec device table |
Next:PCodecDevice;
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Next entry in Codec device table |
Codec device
PCodecDevice = ^TCodecDevice;
TCodecDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Codec device |
| Codec Properties | |
CodecId:LongWord;
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Unique Id of this Codec device in the Codec device table |
CodecState:LongWord;
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Codec dveice state (eg CODEC_STATE_ENABLED) |
DeviceProperties:TCodecDeviceProperties;
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A Device specific DeviceProperties method implementing the standard Codec device interface (Or nil if the default method is suitable) |
| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Properties:TCodecProperties;
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Device properties |
| Internal Properties | |
Prev:PCodecDevice;
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Previous entry in Codec device table |
Next:PCodecDevice;
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Next entry in Codec device table |
Codec device
PCodecDevice = ^TCodecDevice;
TCodecDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Codec device |
| Codec Properties | |
CodecId:LongWord;
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Unique Id of this Codec device in the Codec device table |
CodecState:LongWord;
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Codec dveice state (eg CODEC_STATE_ENABLED) |
DeviceProperties:TCodecDeviceProperties;
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A Device specific DeviceProperties method implementing the standard Codec device interface (Or nil if the default method is suitable) |
| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Properties:TCodecProperties;
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Device properties |
| Internal Properties | |
Prev:PCodecDevice;
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Previous entry in Codec device table |
Next:PCodecDevice;
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Next entry in Codec device table |
Public variables
Codec logging
CODEC_DEFAULT_LOG_LEVEL:LongWord = CODEC_LOG_LEVEL_DEBUG;
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Minimum level for Codec messages. Only messages with level greater than or equal to this will be printed. |
CODEC_LOG_ENABLED:Boolean;
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Function declarations
Initialization functions
procedure CodecInit;
Description: Initialize the Codec unit and Codec device table
| Note | Called only during system startup |
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Codec device functions
function CodecDeviceProperties(Codec:PCodecDevice; Properties:PCodecProperties):LongWord;
Description: Get the properties for the specified Codec device
| Codec | The Codec device to get properties from |
|---|---|
| Properties | Pointer to a TCodecProperties structure to fill in |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function CodecDeviceCreate:PCodecDevice;
Description: Create a new Codec device entry
| Return | Pointer to new Codec device entry or nil if Codec device could not be created |
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function CodecDeviceCreateEx(Size:LongWord):PCodecDevice;
Description: Create a new Codec device entry
| Size | Size in bytes to allocate for new Codec device (Including the Codec device entry) |
|---|---|
| Return | Pointer to new Codec device entry or nil if Codec device could not be created |
function CodecDeviceDestroy(Codec:PCodecDevice):LongWord;
Description: Destroy an existing Codec device entry
| Note | None documented |
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function CodecDeviceRegister(Codec:PCodecDevice):LongWord;
Description: Register a new Codec device in the Codec device table
| Note | None documented |
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function CodecDeviceDeregister(Codec:PCodecDevice):LongWord;
Description: Deregister an Codec device from the Codec device table
| Note | None documented |
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function CodecDeviceFind(CodecId:LongWord):PCodecDevice;
Description: To be documented
| Note | None documented |
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function CodecDeviceFindByName(const Name:String):PCodecDevice; inline;
Description: To be documented
| Note | None documented |
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function CodecDeviceFindByDescription(const Description:String):PCodecDevice; inline;
Description: To be documented
| Note | None documented |
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function CodecDeviceEnumerate(Callback:TCodecEnumerate; Data:Pointer):LongWord;
Description: To be documented
| Note | None documented |
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function CodecDeviceNotification(Codec:PCodecDevice; Callback:TCodecNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: To be documented
| Note | None documented |
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Codec helper functions
function CodecGetCount:LongWord; inline;
Description: Get the current Codec device count
| Note | None documented |
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function CodecDeviceGetDefault:PCodecDevice; inline;
Description: Get the current default Codec device
| Note | None documented |
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function CodecDeviceSetDefault(Codec:PCodecDevice):LongWord;
Description: Set the current default Codec device
| Note | None documented |
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function CodecDeviceCheck(Codec:PCodecDevice):PCodecDevice;
Description: Check if the supplied Codec device is in the Codec device table
| Note | None documented |
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procedure CodecLog(Level:LongWord; Codec:PCodecDevice; const AText:String);
Description: To be documented
| Note | None documented |
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procedure CodecLogInfo(Codec:PCodecDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure CodecLogError(Codec:PCodecDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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procedure CodecLogDebug(Codec:PCodecDevice; const AText:String); inline;
Description: To be documented
| Note | None documented |
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