DefaultHTTPStreamingSwitchManager

(Beta)

Package	org.osmf.net.httpstreaming
Class	public class DefaultHTTPStreamingSwitchManager
Inheritance	DefaultHTTPStreamingSwitchManager RuleSwitchManagerBase NetStreamSwitchManagerBase EventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Default implementation of SwitchManagerBase

Related API Elements

org.osmf.net.abr.MetricBase
org.osmf.net.abr.RuleBase

Public Properties

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	Property		Defined By
		actualIndex : int [read-only] The index of the currently downloading quality level	RuleSwitchManagerBase
		autoSwitch : Boolean [override]	RuleSwitchManagerBase
		climbFactor : Number A factor to be applied when switching up.	DefaultHTTPStreamingSwitchManager
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		currentIndex : uint [override] [read-only]	RuleSwitchManagerBase
		emergencyRules : Vector.<RuleBase> [read-only] Array of normal rules to be used in the algorithm.	RuleSwitchManagerBase
		maxAllowedIndex : int The highest stream index that the switching manager is allowed to switch to.	NetStreamSwitchManagerBase
		maxDownSwitchLimit : int The maximum difference between the indices of the old and new quality level when switching down.	DefaultHTTPStreamingSwitchManager
		maxReliabilityRecordSize : uint The maximum length of the reliability record (how many switches to remember)	DefaultHTTPStreamingSwitchManager
		maxUpSwitchLimit : int The maximum difference between the indices of the old and new quality level when switching up.	DefaultHTTPStreamingSwitchManager
		metricRepository : MetricRepository [read-only] The metric repository responsible with providing the metrics	RuleSwitchManagerBase
		minReliability : Number The minimum reliability for a quality level to be used.	DefaultHTTPStreamingSwitchManager
		minReliabilityRecordSize : uint The minimum length of the reliability record below which reliability is not an issue	DefaultHTTPStreamingSwitchManager
		normalRules : Vector.<RuleBase> [read-only] Array of normal rules to be used in the algorithm.	DefaultHTTPStreamingSwitchManager
		normalRuleWeights : Vector.<Number> The weights of the normal rules (their importance in the algorithm). Valid values must obey the following rules: same number of weights as there are rules all rules must be equal or greater than zero at least one weight must be non-zero	DefaultHTTPStreamingSwitchManager

Protected Properties

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	Property		Defined By
		_autoSwitch : Boolean	NetStreamSwitchManagerBase
		_maxAllowedIndex : int	NetStreamSwitchManagerBase

Public Methods

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	Method		Defined By
		DefaultHTTPStreamingSwitchManager(notifier:EventDispatcher, switcher:NetStreamSwitcher, metricRepository:MetricRepository, emergencyRules:Vector.<RuleBase> = null, autoSwitch:Boolean = true, normalRules:Vector.<RuleBase> = null, normalRuleWeights:Vector.<Number> = null, minReliability:Number = 0.85, minReliabilityRecordSize:uint = 5, maxReliabilityRecordSize:uint = 30, climbFactor:Number = 0.9, maxUpSwitchLimit:int = 1, maxDownSwitchLimit:int = 2) Constructor.	DefaultHTTPStreamingSwitchManager
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.	EventDispatcher
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	EventDispatcher
		getCurrentReliability(index:uint):Number The current reliability of the specified index.	DefaultHTTPStreamingSwitchManager
		getNewEmergencyIndex(maxBitrate:Number):uint [override] Returns an index that satisfies the maxBitrate constraint	DefaultHTTPStreamingSwitchManager
		getNewIndex():uint [override] Computes the necessary rules and metrics and determines the index to switch to.	DefaultHTTPStreamingSwitchManager
		hasEventListener(type:String):Boolean Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		switchTo(index:int):void [override]	RuleSwitchManagerBase
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	EventDispatcher

Protected Methods

	Method		Defined By
		getMaxIndex(maxBitrate:Number, emergencyFlag:Boolean = false):uint Determines maximum available index whose declared bitrate is smaller than maxBitrate.	DefaultHTTPStreamingSwitchManager
		isReliable(index:uint):Boolean Determines whether an index is reliable. This is achieved by comparing the index's reliability with the minimumReliability	DefaultHTTPStreamingSwitchManager
		setNormalRules(value:Vector.<RuleBase>):void Array of normal rules to be used in the algorithm.	DefaultHTTPStreamingSwitchManager

Events

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	Event		Summary	Defined By
		activate	[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.	EventDispatcher
		deactivate	[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.	EventDispatcher

Property Detail

climbFactor

property

climbFactor:Number

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

A factor to be applied when switching up. For example: currently playing 300kbps; new ideal bitrate = 1000kbps This means that: max bitrate = 300 + climbFactor x (1000 - 300)

It must be equal or greater than 0

Implementation
public function get climbFactor():Number
public function set climbFactor(value:Number):void

Throws

ArgumentError — If it is set to a negative value

maxDownSwitchLimit

property

maxDownSwitchLimit:int

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The maximum difference between the indices of the old and new quality level when switching down. Set this to a -1 to disable the constraint.

This works in conjunction with the reliability constraint. If no reliable stream is available inside the maxDownSwitchLimit, no switch will be performed. The maxDownSwitchLimit constraint does not apply to emergency switches.

Implementation
public function get maxDownSwitchLimit():int
public function set maxDownSwitchLimit(value:int):void

maxReliabilityRecordSize

property

maxReliabilityRecordSize:uint

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The maximum length of the reliability record (how many switches to remember)

Implementation
public function get maxReliabilityRecordSize():uint
public function set maxReliabilityRecordSize(value:uint):void

maxUpSwitchLimit

property

maxUpSwitchLimit:int

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The maximum difference between the indices of the old and new quality level when switching up. Set this to a -1 to disable the constraint.

This works in conjunction with the reliability constraint. If no reliable stream is available inside the maxUpSwitchLlimit, no switch will be performed.

Implementation
public function get maxUpSwitchLimit():int
public function set maxUpSwitchLimit(value:int):void

minReliability

property

minReliability:Number

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The minimum reliability for a quality level to be used. This value must be a number in the [0-1] interval (inclusive)

Implementation
public function get minReliability():Number
public function set minReliability(value:Number):void

Throws

ArgumentError — If it is set to an invalid value

minReliabilityRecordSize

property

minReliabilityRecordSize:uint

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The minimum length of the reliability record below which reliability is not an issue

Implementation
public function get minReliabilityRecordSize():uint
public function set minReliabilityRecordSize(value:uint):void

normalRules

property

normalRules:Vector.<RuleBase> [read-only]

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Array of normal rules to be used in the algorithm. A normal rule can recommend both lower and higher bitrates than the current one

Implementation
public function get normalRules():Vector.<RuleBase>

normalRuleWeights

property

normalRuleWeights:Vector.<Number>

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The weights of the normal rules (their importance in the algorithm). Valid values must obey the following rules:

same number of weights as there are rules
all rules must be equal or greater than zero
at least one weight must be non-zero

Implementation
public function get normalRuleWeights():Vector.<Number>
public function set normalRuleWeights(value:Vector.<Number>):void

Throws

ArgumentError — If the weights are not valid, by breaking at least one of the above criteria

Constructor Detail

()

Constructor

public function DefaultHTTPStreamingSwitchManager(notifier:EventDispatcher, switcher:NetStreamSwitcher, metricRepository:MetricRepository, emergencyRules:Vector.<RuleBase> = null, autoSwitch:Boolean = true, normalRules:Vector.<RuleBase> = null, normalRuleWeights:Vector.<Number> = null, minReliability:Number = 0.85, minReliabilityRecordSize:uint = 5, maxReliabilityRecordSize:uint = 30, climbFactor:Number = 0.9, maxUpSwitchLimit:int = 1, maxDownSwitchLimit:int = 2)

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Constructor.

Parameters

	`notifier:EventDispatcher` — An object that dispatches the HTTPStreamingEvent.RUN_ALGORITHM event

	`switcher:NetStreamSwitcher` — The NetStreamSwitcher to use for switching

	`metricRepository:MetricRepository` — The repository responsible with providing metrics

	`emergencyRules:Vector.<RuleBase>` (default = `null`) — Array of rules to be used in the algorithm. An emergency rule can only recommend lower bitrates than the current one.

	`autoSwitch:Boolean` (default = `true`) — Flag deciding whether autoSwitch should be enabled

	`normalRules:Vector.<RuleBase>` (default = `null`) — Array of normal rules to be used in the algorithm. A normal rule can recommend both lower and higher bitrates than the current one.

	`normalRuleWeights:Vector.<Number>` (default = `null`) — The weights of the normal rules (their importance in the algorithm)

	`minReliability:Number` (default = `0.85`) — The minimum reliability for a quality level to be used

	`minReliabilityRecordSize:uint` (default = `5`) — The maximum length of the reliability record (how many switches to remember)

	`maxReliabilityRecordSize:uint` (default = `30`) — The minimum length of the reliability record below which reliability is not an issue

	`climbFactor:Number` (default = `0.9`) — A factor to be applied when switching up. For example: currently playing 300kbps; new ideal bitrate = 1000kbps This means that: max bitrate = 300 + climbFactor x (1000 - 300)

	`maxUpSwitchLimit:int` (default = `1`) — The maximum difference between the indices of the old and new quality level when switching up. Set this to -1 to disable the constraint. This works in conjunction with the reliability constraint. If no reliable stream is available inside the maxUpSwitchLimit, no switch will be performed.

	`maxDownSwitchLimit:int` (default = `2`) — The maximum difference between the indices of the old and new quality level when switching down. Set this to -1 value to disable the constraint. This works in conjunction with the reliability constraint. If no reliable stream is available inside the maxDownSwitchLimit, no switch will be performed. The maxDownSwitchLimit constraint does not apply to emergency switches.

Method Detail

getCurrentReliability

()

method

public function getCurrentReliability(index:uint):Number

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

The current reliability of the specified index.

Parameters

index:uint

Returns

Number — A number between 0 (most unreliable) and 1 (most reliable)

getMaxIndex

()

method

protected function getMaxIndex(maxBitrate:Number, emergencyFlag:Boolean = false):uint

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Determines maximum available index whose declared bitrate is smaller than maxBitrate. Only reliable indices (indices that pass the isReliable() function) are taken into consideration.

Parameters

	`maxBitrate:Number` — The maximum bitrate to which the index must comply

	`emergencyFlag:Boolean` (default = `false`)

Returns

uint — The index satisfying the aforementioned condition

Related API Elements

isReliable()

getNewEmergencyIndex

()

method

override public function getNewEmergencyIndex(maxBitrate:Number):uint

Returns an index that satisfies the maxBitrate constraint

Parameters

maxBitrate:Number

Returns

uint

getNewIndex

()

method

override public function getNewIndex():uint

Computes the necessary rules and metrics and determines the index to switch to. The index must be a valid one (it can be higher than maxAllowedIndex, but it should be a real index that is available)

Returns

uint

isReliable

()

method

protected function isReliable(index:uint):Boolean

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Determines whether an index is reliable. This is achieved by comparing the index's reliability with the minimumReliability

Parameters

index:uint

Returns

Boolean

Related API Elements

minimumReliability
getCurrentReliability()

setNormalRules

()

method

protected function setNormalRules(value:Vector.<RuleBase>):void

Language Version:

ActionScript 3.0

Product Version:

OSMF 2.0

Runtime Versions:

Flash Player 10, AIR 1.5

Array of normal rules to be used in the algorithm. A normal rule can recommend both lower and higher bitrates than the current one.

Parameters

value:Vector.<RuleBase>

Related API Elements

normalRules

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DefaultHTTPStreamingSwitchManager - AS3 OSMF

Classes x

climbFactor

maxDownSwitchLimit

maxReliabilityRecordSize

maxUpSwitchLimit

minReliability

minReliabilityRecordSize

normalRules

normalRuleWeights