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
lastTimeChosenMs_ :number
The last wall-clock time, in milliseconds, when streams were chosen.
Type:
- number
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variants_ :Array.<!shaka.extern.Variant>
A filtered list of Variants to choose from.
Type:
- Array.<!shaka.extern.Variant>
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Methods
filterAndSortVariants_(restrictionsnullable, variantsnon-null) → {Array.<shaka.extern.Variant>}
Parameters:
| Name | Type | Attributes | Description |
|---|---|---|---|
restrictions |
shaka.extern.Restrictions |
<nullable> |
|
variants |
Array.<shaka.extern.Variant> |
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Returns:
variants filtered according to
|restrictions| and sorted in ascending order of bandwidth.
- Type
- Array.<shaka.extern.Variant>
chooseVariant() → {shaka.extern.Variant}
Chooses one variant to switch to. Called by the Player.
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Returns:
- Type
- shaka.extern.Variant
configure(config)
Sets the ABR configuration.
It is the responsibility of the AbrManager implementation to implement the
restrictions behavior described in shaka.extern.AbrConfiguration.
Parameters:
| Name | Type | Description |
|---|---|---|
config |
shaka.extern.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
getDefaultBandwidth_()
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init(switchCallback)
Initializes the AbrManager.
Parameters:
| Name | Type | Description |
|---|---|---|
switchCallback |
shaka.extern.AbrManager.SwitchCallback |
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playbackRateChanged(rate)
Updates manager playback rate.
Parameters:
| Name | Type | Description |
|---|---|---|
rate |
number |
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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.<!shaka.extern.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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suggestStreams_()
Calls switch_() with the variant chosen by chooseVariant().
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