DefaultHTTPStreamingSwitchManager

Pacchetto	org.osmf.net.httpstreaming
Classe	public class DefaultHTTPStreamingSwitchManager
Ereditarietà	DefaultHTTPStreamingSwitchManager RuleSwitchManagerBase NetStreamSwitchManagerBase EventDispatcher Object

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

Default implementation of SwitchManagerBase

Elementi API correlati

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

Proprietà pubbliche

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	Proprietà		Definito da
		actualIndex : int [sola lettura] 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 Un riferimento all'oggetto classe o alla funzione di costruzione per una determinata istanza di oggetto.	Object
		currentIndex : uint [override] [sola lettura]	RuleSwitchManagerBase
		emergencyRules : Vector.<RuleBase> [sola lettura] 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 [sola lettura] 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> [sola lettura] 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

Proprietà protette

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	Proprietà		Definito da
		_autoSwitch : Boolean	NetStreamSwitchManagerBase
		_maxAllowedIndex : int	NetStreamSwitchManagerBase

Metodi pubblici

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	Metodo		Definito da
		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 Registra un oggetto listener di eventi con un oggetto EventDispatcher, in modo che il listener riceva la notifica di un evento.	EventDispatcher
		dispatchEvent(event:Event):Boolean Invia un evento nel flusso di eventi.	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 Verifica se per l'oggetto EventDispatcher sono presenti listener registrati per un tipo specifico di evento.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indica se per un oggetto è definita una proprietà specifica.	Object
		isPrototypeOf(theClass:Object):Boolean Indica se un'istanza della classe Object si trova nella catena di prototipi dell'oggetto specificato come parametro.	Object
		propertyIsEnumerable(name:String):Boolean Indica se la proprietà specificata esiste ed è enumerabile.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Rimuove un listener dall'oggetto EventDispatcher.	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Imposta la disponibilità di una proprietà dinamica per le operazioni cicliche.	Object
		switchTo(index:int):void [override]	RuleSwitchManagerBase
		toLocaleString():String Restituisce la rappresentazione in formato stringa di questo oggetto, formattato in base alle convenzioni specifiche per le versioni localizzate.	Object
		toString():String Restituisce la rappresentazione in formato stringa dell'oggetto specificato.	Object
		valueOf():Object Restituisce il valore di base dell'oggetto specificato.	Object
		willTrigger(type:String):Boolean Verifica se un listener di eventi è registrato con questo oggetto EventDispatcher o qualsiasi suo antenato per il tipo di evento specificato.	EventDispatcher

Metodi protetti

	Metodo		Definito da
		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

Eventi

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	Evento		Riepilogo	Definito da
		activate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR ottiene lo stato di attivazione del sistema operativo ed entra nello stato attivo.	EventDispatcher
		deactivate	[evento di trasmissione] Inviato quando Flash Player o l'applicazione AIR perde l'attivazione del sistema operativo e sta entrando nello stato inattivo.	EventDispatcher

Descrizione delle proprietà

climbFactor

proprietà

climbFactor:Number

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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

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

Genera

ArgumentError — If it is set to a negative value

maxDownSwitchLimit

proprietà

maxDownSwitchLimit:int

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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.

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

maxReliabilityRecordSize

proprietà

maxReliabilityRecordSize:uint

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

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

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

maxUpSwitchLimit

proprietà

maxUpSwitchLimit:int

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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.

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

minReliability

proprietà

minReliability:Number

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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)

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

Genera

ArgumentError — If it is set to an invalid value

minReliabilityRecordSize

proprietà

minReliabilityRecordSize:uint

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

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

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

normalRules

proprietà

normalRules:Vector.<RuleBase> [sola lettura]

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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

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

normalRuleWeights

proprietà

normalRuleWeights:Vector.<Number>

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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

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

Genera

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

Descrizione della funzione di costruzione

()

Funzione di costruzione

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)

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

Constructor.

Parametri

	`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.

Descrizione dei metodi

getCurrentReliability

()

metodo

public function getCurrentReliability(index:uint):Number

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

The current reliability of the specified index.

Parametri

index:uint

Restituisce

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

getMaxIndex

()

metodo

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

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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.

Parametri

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

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

Restituisce

uint — The index satisfying the aforementioned condition

Elementi API correlati

isReliable()

getNewEmergencyIndex

()

metodo

override public function getNewEmergencyIndex(maxBitrate:Number):uint

Returns an index that satisfies the maxBitrate constraint

Parametri

maxBitrate:Number

Restituisce

uint

getNewIndex

()

metodo

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)

Restituisce

uint

isReliable

()

metodo

protected function isReliable(index:uint):Boolean

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

Flash Player 10, AIR 1.5

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

Parametri

index:uint

Restituisce

Boolean

Elementi API correlati

minimumReliability
getCurrentReliability()

setNormalRules

()

metodo

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

Versione linguaggio:

ActionScript 3.0

Versione prodotto:

OSMF 2.0

Versioni runtime:

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.

Parametri

value:Vector.<RuleBase>

Elementi API correlati

normalRules

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DefaultHTTPStreamingSwitchManager - AS3 OSMF

Classi x

climbFactor

maxDownSwitchLimit

maxReliabilityRecordSize

maxUpSwitchLimit

minReliability

minReliabilityRecordSize

normalRules

normalRuleWeights