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@UnstableApi
public interface LoadControl

Known direct subclasses
DefaultLoadControl

The default LoadControl implementation.

Controls buffering of media.

Summary

Nested types
public final class LoadControl.Parameters

Information about the current playback context and the MediaPeriod for which LoadControl methods are called.

Constants
default static final MediaSource.MediaPeriodId

This field is deprecated.

Used as a placeholder when MediaPeriodId is unknown.

Public methods
abstract Allocator

Returns the Allocator that should be used to obtain media buffer allocations for the specified PlayerId.
default long

This method is deprecated.

Implements getBackBufferDurationUs instead.
default long

Returns the duration of media to retain in the buffer prior to the current playback position, for fast backward seeking.
default void

This method is deprecated.

Use onPrepared instead.
default void
onPrepared(PlayerId playerId)

Called by the player when prepared with a new source.
default void

This method is deprecated.

Implement onReleased instead.
default void
onReleased(PlayerId playerId)

Called by the player when released.
default void

This method is deprecated.

Implement onStopped instead.
default void
onStopped(PlayerId playerId)

Called by the player when stopped.
default void
onTracksSelected(
    LoadControl.Parameters parameters,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

Called by the player when a track selection occurs.
default void
onTracksSelected(
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

This method is deprecated.

Implement onTracksSelected instead.
default void
onTracksSelected(
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

This method is deprecated.

Implement onTracksSelected instead.
default void
onTracksSelected(
    PlayerId playerId,
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

This method is deprecated.

Implement onTracksSelected instead.
default boolean

This method is deprecated.

Implements retainBackBufferFromKeyframe instead.
default boolean

Returns whether media should be retained from the keyframe before the current playback position minus getBackBufferDurationUs, rather than any sample before or at that position.
default boolean

Called by the player to determine whether it should continue to load the source.
default boolean
shouldContinueLoading(
    long playbackPositionUs,
    long bufferedDurationUs,
    float playbackSpeed
)

This method is deprecated.

Implement shouldContinueLoading instead.
default boolean
shouldContinuePreloading(
    PlayerId playerId,
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    long bufferedDurationUs
)

Called to determine whether preloading should be continued.
default boolean

Called repeatedly by the player when it's loading the source, has yet to start playback, and has the minimum amount of data necessary for playback to be started.
default boolean
shouldStartPlayback(
    long bufferedDurationUs,
    float playbackSpeed,
    boolean rebuffering,
    long targetLiveOffsetUs
)

This method is deprecated.

Implement shouldStartPlayback instead.
default boolean
shouldStartPlayback(
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    long bufferedDurationUs,
    float playbackSpeed,
    boolean rebuffering,
    long targetLiveOffsetUs
)

This method is deprecated.

Implement shouldStartPlayback instead.

Constants

EMPTY_MEDIA_PERIOD_ID

default static final MediaSource.MediaPeriodId EMPTY_MEDIA_PERIOD_ID

Public methods

getAllocator

abstract Allocator getAllocator(PlayerId playerId)

Returns the Allocator that should be used to obtain media buffer allocations for the specified PlayerId.

getBackBufferDurationUs

default long getBackBufferDurationUs()

getBackBufferDurationUs

default long getBackBufferDurationUs(PlayerId playerId)

Returns the duration of media to retain in the buffer prior to the current playback position, for fast backward seeking.

Note: If retainBackBufferFromKeyframe is false then seeking in the back-buffer will only be fast if the back-buffer contains a keyframe prior to the seek position.

Note: Implementations should return a single value. Dynamic changes to the back-buffer are not currently supported.

Parameters
PlayerId playerId

The ID of the player that requests the back buffer duration.
Returns
long

The duration of media to retain in the buffer prior to the current playback position, in microseconds.

onPrepared

default void onPrepared()

onPrepared

default void onPrepared(PlayerId playerId)

Called by the player when prepared with a new source.

Parameters
PlayerId playerId

The ID of the player that prepared a new source.

onReleased

default void onReleased()

onReleased

default void onReleased(PlayerId playerId)

Called by the player when released.

Parameters
PlayerId playerId

The ID of the player that was released.

onStopped

default void onStopped()

onStopped

default void onStopped(PlayerId playerId)

Called by the player when stopped.

Parameters
PlayerId playerId

The ID of the player that was stopped.

onTracksSelected

default void onTracksSelected(
    LoadControl.Parameters parameters,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

Called by the player when a track selection occurs.

Parameters
LoadControl.Parameters parameters

containing the ID of the player, the current Timeline in ExoPlayer, and the MediaPeriod for which the selection was made. Will be EMPTY_MEDIA_PERIOD_ID when timeline is empty.
TrackGroupArray trackGroups

The TrackGroups from which the selection was made.
@NullableType ExoTrackSelection[] trackSelections

The track selections that were made.

onTracksSelected

default void onTracksSelected(
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

onTracksSelected

default void onTracksSelected(
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

onTracksSelected

default void onTracksSelected(
    PlayerId playerId,
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    Renderer[] renderers,
    TrackGroupArray trackGroups,
    @NullableType ExoTrackSelection[] trackSelections
)

retainBackBufferFromKeyframe

default boolean retainBackBufferFromKeyframe()

retainBackBufferFromKeyframe

default boolean retainBackBufferFromKeyframe(PlayerId playerId)

Returns whether media should be retained from the keyframe before the current playback position minus getBackBufferDurationUs, rather than any sample before or at that position.

Warning: Returning true will cause the back-buffer size to depend on the spacing of keyframes in the media being played. Returning true is not recommended unless you control the media and are comfortable with the back-buffer size exceeding getBackBufferDurationUs by as much as the maximum duration between adjacent keyframes in the media.

Note: Implementations should return a single value. Dynamic changes to the back-buffer are not currently supported.

Parameters
PlayerId playerId

The ID of the player that requests whether to retain the back buffer from key frame.
Returns
boolean

Whether media should be retained from the keyframe before the current playback position minus getBackBufferDurationUs, rather than any sample before or at that position.

shouldContinueLoading

default boolean shouldContinueLoading(LoadControl.Parameters parameters)

Called by the player to determine whether it should continue to load the source. If this method returns true, the MediaPeriod identified in the most recent onTracksSelected call will continue being loaded.

Parameters
LoadControl.Parameters parameters

Information about the playback context and the MediaPeriod that will continue to load if this method returns true.
Returns
boolean

Whether the loading should continue.

shouldContinueLoading

default boolean shouldContinueLoading(
    long playbackPositionUs,
    long bufferedDurationUs,
    float playbackSpeed
)

shouldContinuePreloading

default boolean shouldContinuePreloading(
    PlayerId playerId,
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    long bufferedDurationUs
)

Called to determine whether preloading should be continued. If this method returns true, the presented period will continue to load media.

Parameters
PlayerId playerId

The ID of the player that wants to continue preloading.
Timeline timeline

The Timeline containing the preload period that can be looked up with MediaPeriodId.periodUid.
MediaSource.MediaPeriodId mediaPeriodId

The MediaPeriodId of the preloading period.
long bufferedDurationUs

The duration of media currently buffered by the preload period.
Returns
boolean

Whether the preloading should continue for the given period.

shouldStartPlayback

default boolean shouldStartPlayback(LoadControl.Parameters parameters)

Called repeatedly by the player when it's loading the source, has yet to start playback, and has the minimum amount of data necessary for playback to be started. The value returned determines whether playback is actually started. The load control may opt to return false until some condition has been met (e.g. a certain amount of media is buffered).

Parameters
LoadControl.Parameters parameters

Information about the playback context and the MediaPeriod that will start playing if this method returns true.
Returns
boolean

Whether playback should be allowed to start or resume.

shouldStartPlayback

default boolean shouldStartPlayback(
    long bufferedDurationUs,
    float playbackSpeed,
    boolean rebuffering,
    long targetLiveOffsetUs
)

shouldStartPlayback

default boolean shouldStartPlayback(
    Timeline timeline,
    MediaSource.MediaPeriodId mediaPeriodId,
    long bufferedDurationUs,
    float playbackSpeed,
    boolean rebuffering,
    long targetLiveOffsetUs
)
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