Class: shaka.abr.SimpleAbrManager

Constructor

new SimpleAbrManager()

This defines the default ABR manager for the Player. An instance of this class is used when no ABR manager is given.

The behavior of this class is to take throughput samples using segmentDownloaded to estimate the current network bandwidth. Then it will use that to choose the streams that best fit the current bandwidth. It will always pick the highest bandwidth variant it thinks can be played.

After initial choices are made, this class will call switchCallback() when there is a better choice. switchCallback() will not be called more than once per (shaka.abr.SimpleAbrManager.SWITCH_INTERVAL_MS).

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Members

(private) bandwidthEstimator_ :shaka.abr.EwmaBandwidthEstimator

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(private, nullable) config_ :shakaExtern.AbrConfiguration

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(private) enabled_ :boolean

Type:
  • boolean
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(private, nullable) lastTimeChosenMs_ :number

The last wall-clock time, in milliseconds, when streams were chosen.
Type:
  • number
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(private) startupComplete_ :boolean

Type:
  • boolean
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(private, nullable) switch_ :shakaExtern.AbrManager.SwitchCallback

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(private, non-null) variants_ :Array.<!shakaExtern.Variant>

A filtered list of Variants to choose from.
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Methods

(private, static) filterAndSortVariants_(restrictions, variantsnon-null) → (non-null) {Array.<shakaExtern.Variant>}

Parameters:
Name Type Description
restrictions shakaExtern.Restrictions
variants Array.<shakaExtern.Variant>
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Returns:
variants filtered according to |restrictions| and sorted in ascending order of bandwidth.
Type
Array.<shakaExtern.Variant>

chooseVariant() → {shakaExtern.Variant}

Chooses one variant to switch to. Called by the Player.
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Returns:
Type
shakaExtern.Variant

configure(config)

Sets the abr configurations.
Parameters:
Name Type Description
config shakaExtern.AbrConfiguration
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disable()

Disables automatic Stream suggestions. After this, the AbrManager may not call switchCallback().
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enable()

Enables automatic Variant choices from the last ones passed to setVariants. After this, the AbrManager may call switchCallback() at any time.
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getBandwidthEstimate() → {number}

Gets an estimate of the current bandwidth in bit/sec. This is used by the Player to generate stats.
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Returns:
Type
number

init(switchCallback)

Initializes the AbrManager.
Parameters:
Name Type Description
switchCallback shakaExtern.AbrManager.SwitchCallback
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segmentDownloaded(deltaTimeMs, numBytes)

Notifies the AbrManager that a segment has been downloaded (includes MP4 SIDX data, WebM Cues data, initialization segments, and media segments).
Parameters:
Name Type Description
deltaTimeMs number The duration, in milliseconds, that the request took to complete.
numBytes number The total number of bytes transferred.
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setVariants(variantsnon-null)

Updates manager's variants collection.
Parameters:
Name Type Description
variants Array.<!shakaExtern.Variant>
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stop()

Stops any background timers and frees any objects held by this instance. This will only be called after a call to init.
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(private) suggestStreams_()

Calls switch_() with which Streams to switch to.
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