Unit Audio

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Description

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Ultibo Audio interface unit

This unit provides both the Audio device interface and the generic USB audio device driver.

Constants

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Audio specific constants AUDIO_*

AUDIO_NAME_PREFIX = 'Audio';

Name prefix for Audio Devices

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Audio device types AUDIO_TYPE_*

AUDIO_TYPE_NONE = 0;

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Audio device states AUDIO_STATE_*

AUDIO_STATE_DISABLED = 0;
AUDIO_STATE_ENABLED = 1;

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Audio device flags AUDIO_FLAG_*

AUDIO_FLAG_NONE = $00000000;

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Audio logging AUDIO_LOG_*

AUDIO_LOG_LEVEL_DEBUG = LOG_LEVEL_DEBUG;	Audio debugging messages
AUDIO_LOG_LEVEL_INFO = LOG_LEVEL_INFO;	Audio informational messages, such as a device being attached or detached
AUDIO_LOG_LEVEL_ERROR = LOG_LEVEL_ERROR;	Audio error messages
AUDIO_LOG_LEVEL_NONE = LOG_LEVEL_NONE;	No Audio messages

Type definitions

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Audio properties

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PAudioProperties = ^TAudioProperties;

TAudioProperties = record

Flags:LongWord;

Device flags (eg AUDIO_FLAG_????)

Audio enumeration callback

TAudioEnumerate = function(Audio:PAudioDevice; Data:Pointer):LongWord;

Audio notification callback

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

Audio device get properties

TAudioDeviceGetProperties = function(Audio:PAudioDevice; Properties:PAudioProperties):LongWord;

Audio device

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PAudioDevice = ^TAudioDevice;

TAudioDevice = record

Device Properties
Device:TDevice;	The Device entry for this Audio device
Audio Properties
AudioId:LongWord;	Unique Id of this Audio device in the Audio device table
AudioState:LongWord;	Audio device state (eg AUDIO_STATE_ENABLED)
DeviceGetProperties:TAudioDeviceGetProperties;	A Device specific DeviceGetProperties method implementing the standard Audio device interface (Or nil if the default method is suitable)
Driver Properties
Lock:TMutexHandle;	Device lock
Properties:TAudioProperties;	Device properties
Internal Properties
Prev:PAudioDevice;	Previous entry in Audio device table
Next:PAudioDevice;	Next entry in Audio device table

Public variables

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Audio logging

AUDIO_DEFAULT_LOG_LEVEL:LongWord = AUDIO_LOG_LEVEL_DEBUG;

Minimum level for Audio messages. Only messages with level greater than or equal to this will be printed.

AUDIO_LOG_ENABLED:Boolean;

Function declarations

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To be documented

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