Class: shaka.media.SimpleAbrManager

Constructor

new SimpleAbrManager()

Creates a SimpleAbrManager, which selects video tracks using a basic set of heuristics.
Implements:
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Members

(private, static, constant) BANDWIDTH_DOWNGRADE_TARGET_ :number

The fraction of the estimated bandwidth we should downgrade to avoid exceeding.
Type:
  • number
Source:

(private, static, constant) BANDWIDTH_UPGRADE_TARGET_ :number

The fraction of the estimated bandwidth which we should try to use when upgrading.
Type:
  • number
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(private, static, constant) FIRST_SWITCH_INTERVAL_ :number

The minimum amount of time that must pass before the first switch, in milliseconds. This gives the bandwidth estimator time to get some real data before changing anything.
Type:
  • number
Source:

(private, static, constant) MIN_EVAL_INTERVAL_ :number

The minimum amount of time that must pass between bandwidth evaluations, in milliseconds. This keeps us from checking for adaptation opportunities too often.
Type:
  • number
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(private, static, constant) MIN_SWITCH_INTERVAL_ :number

The minimum amount of time that must pass between switches, in milliseconds. This keeps us from changing too often and annoying the user.
Type:
  • number
Source:

(private) enabled_ :boolean

Type:
  • boolean
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(private) estimator_ :shaka.util.IBandwidthEstimator

Type:
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(private, non-null) eventManager_ :shaka.util.EventManager

Type:
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(private) nextAdaptationTime_ :number

The timestamp after which we are allowed to adapt, in milliseconds.
Type:
  • number
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(private) started_ :boolean

Type:
  • boolean
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(private) videoSource_ :shaka.player.IVideoSource

Type:
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Methods

(private, static) findActiveTrack_(trackListnon-null) → {T}

Find the active track in the list.
Parameters:
Name Type Description
trackList Array.<T>
Source:
Returns:
Type
T

(private) chooseNewTrack_(eventnon-null)

Makes adaptation decisions.
Parameters:
Name Type Description
event Event
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(private) chooseVideoTrack_() → {shaka.player.VideoTrack}

Choose a video track based on current bandwidth conditions.
Source:
Returns:
The chosen video track or null if there are no video tracks to choose.
Type
shaka.player.VideoTrack

destroy()

Destroy the AbrManager.
Implements:
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enable(enabled)

Enable or disable the AbrManager. It is enabled by default when created.
Parameters:
Name Type Description
enabled boolean
Implements:
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getInitialVideoTrackId() → (nullable) {number}

Decide on an initial video track to use. Called before playback begins.
Implements:
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Returns:
The chosen video track ID or null if there are no video tracks to choose.
Type
number

initialize(estimatornon-null, videoSourcenon-null)

Initialize the AbrManager. This function will only be called by a VideoSource and should only be called once.
Parameters:
Name Type Description
estimator shaka.util.IBandwidthEstimator
videoSource shaka.player.IVideoSource
Implements:
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(private) onAdaptation_(eventnon-null)

Handles adaptation events.
Parameters:
Name Type Description
event Event
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(private) onBandwidth_(eventnon-null)

Handles bandwidth update events.
Parameters:
Name Type Description
event Event
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(protected) selectVideoTrack(track, clearBuffer, opt_clearBufferOffsetopt)

Select the specified video track. Does nothing if the AbrManager has not been started.
Parameters:
Name Type Attributes Description
track shaka.player.VideoTrack the track to the switch to
clearBuffer boolean If true, removes the previous stream's content before switching to the new stream.
opt_clearBufferOffset number <optional>
 if |clearBuffer| and |opt_clearBufferOffset| are truthy, clear the stream buffer from the given offset (relative to the video's current time) to the end of the stream.
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start()

Start processing stream switches. This function will only be called by a VideoSource and should only be called once.
Implements:
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