WrappingMediaSource

Artifact: androidx.media3:media3-exoplayer

Kotlin |Java

@UnstableApi
public abstract class WrappingMediaSource extends CompositeMediaSource

java.lang.Object
↳	androidx.media3.exoplayer.source.BaseMediaSource
	↳	androidx.media3.exoplayer.source.CompositeMediaSource
		↳	androidx.media3.exoplayer.source.WrappingMediaSource

Known direct subclasses

ClippingMediaSource, FilteringMediaSource, LoopingMediaSource, MaskingMediaSource, PreloadMediaSource

`ClippingMediaSource`	`MediaSource` that wraps a source and clips its timeline based on specified start/end positions.
`FilteringMediaSource`	A `MediaSource` that filters the available `track types`.
`LoopingMediaSource`	This class is deprecated. To loop a `MediaSource` indefinitely, use `setRepeatMode` instead of this class.
`MaskingMediaSource`	A `MediaSource` that masks the `Timeline` with a placeholder until the actual media structure is known.
`PreloadMediaSource`	Preloads a `MediaSource` and provides a `MediaPeriod` that has data loaded before playback.

An abstract MediaSource wrapping a single child MediaSource.

The implementation may want to override the following methods as needed:

getMediaItem: Amend the MediaItem for this media source. This is only used before the child source is prepared. You may also want to override canUpdateMediaItem or updateMediaItem to intercept further updates to the MediaItem.
onChildSourceInfoRefreshed: Called whenever the child source's Timeline changed. This Timeline can be amended if needed, for example using ForwardingTimeline. The Timeline for the wrapping source needs to be published with refreshSourceInfo.
createPeriod/releasePeriod: These methods create and release MediaPeriod instances. They typically forward to the wrapped media source and optionally wrap the returned MediaPeriod.

Other methods like prepareSourceInternal, enableInternal, disableInternal or releaseSourceInternal only need to be overwritten if required for resource management.

Summary

Protected fields
`final MediaSource`	`mediaSource` The wrapped child `MediaSource`.

Protected constructors
`WrappingMediaSource(MediaSource mediaSource)` Creates the wrapping `MediaSource`.

Public methods
`boolean`	`canUpdateMediaItem(MediaItem mediaItem)` Returns whether the for this source can be updated with the provided item.
`MediaPeriod`	`createPeriod( MediaSource.MediaPeriodId id, Allocator allocator, long startPositionUs )` Creates the requested `MediaPeriod`.
`@Nullable Timeline`	`getInitialTimeline()` Returns the initial placeholder timeline that is returned immediately when the real timeline is not yet known, or null to let the player create an initial timeline.
`MediaItem`	`getMediaItem()` Returns the whose media is provided by the source.
`boolean`	`isSingleWindow()` Returns true if the media source is guaranteed to never have zero or more than one window.
`void`	`releasePeriod(MediaPeriod mediaPeriod)` Releases a `MediaPeriod`.
`void`	`updateMediaItem(MediaItem mediaItem)` Updates the for this source.

Protected methods
`final void`	`disableChildSource()` Disables the child source.
`final void`	`enableChildSource()` Enables the child source.
`@Nullable MediaSource.MediaPeriodId`	`getMediaPeriodIdForChildMediaPeriodId( MediaSource.MediaPeriodId mediaPeriodId )` Returns the `MediaPeriodId` in the wrapping source corresponding to the specified `MediaPeriodId` in a child source.
`final @Nullable MediaSource.MediaPeriodId`	`getMediaPeriodIdForChildMediaPeriodId( Void childSourceId, MediaSource.MediaPeriodId mediaPeriodId )` Returns the `MediaPeriodId` in the composite source corresponding to the specified `MediaPeriodId` in a child source.
`long`	`getMediaTimeForChildMediaTime( long mediaTimeMs, @Nullable MediaSource.MediaPeriodId mediaPeriodId )` Returns the media time in the `MediaPeriod` of the wrapping source corresponding to the specified media time in the `MediaPeriod` of the child source.
`final long`	`getMediaTimeForChildMediaTime( Void childSourceId, long mediaTimeMs, @Nullable MediaSource.MediaPeriodId mediaPeriodId )` Returns the media time in the `MediaPeriod` of the composite source corresponding to the specified media time in the `MediaPeriod` of the child source.
`int`	`getWindowIndexForChildWindowIndex(int windowIndex)` Returns the window index in the wrapping source corresponding to the specified window index in a child source.
`final int`	`getWindowIndexForChildWindowIndex(Void childSourceId, int windowIndex)` Returns the window index in the composite source corresponding to the specified window index in a child source.
`void`	`onChildSourceInfoRefreshed(Timeline newTimeline)` Called when the child source info has been refreshed.
`final void`	`onChildSourceInfoRefreshed( Void childSourceId, MediaSource mediaSource, Timeline newTimeline )` Called when the source info of a child source has been refreshed.
`final void`	`prepareChildSource()` Prepares the wrapped child source.
`void`	`prepareSourceInternal()` Starts source preparation and enables the source, see `prepareSource`.
`final void`	`prepareSourceInternal(@Nullable TransferListener mediaTransferListener)` Starts source preparation and enables the source, see `prepareSource`.
`final void`	`releaseChildSource()` Releases the child source.

Inherited fields

From androidx.media3.exoplayer.source.BaseMediaSource

@Nullable PlayerId

playerId

Inherited methods

From androidx.media3.exoplayer.source.BaseMediaSource

`final void`	`@UnstableApi addDrmEventListener( Handler handler, DrmSessionEventListener eventListener )` Adds a `DrmSessionEventListener` to the list of listeners which are notified of DRM events for this media source.
`final void`	`@UnstableApi addEventListener( Handler handler, MediaSourceEventListener eventListener )` Adds a `MediaSourceEventListener` to the list of listeners which are notified of media source events.
`final DrmSessionEventListener.EventDispatcher`	`createDrmEventDispatcher( @Nullable MediaSource.MediaPeriodId mediaPeriodId )` Returns a `DrmSessionEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified `MediaPeriodId`
`final DrmSessionEventListener.EventDispatcher`	`createDrmEventDispatcher( int windowIndex, @Nullable MediaSource.MediaPeriodId mediaPeriodId )` Returns a `DrmSessionEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified window index and `MediaPeriodId`.
`final MediaSourceEventListener.EventDispatcher`	`createEventDispatcher(@Nullable MediaSource.MediaPeriodId mediaPeriodId)` Returns a `MediaSourceEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified `MediaPeriodId`.
`final MediaSourceEventListener.EventDispatcher`	`createEventDispatcher( MediaSource.MediaPeriodId mediaPeriodId, long mediaTimeOffsetMs )` This method is deprecated. Use `createEventDispatcher` instead.
`final MediaSourceEventListener.EventDispatcher`	`createEventDispatcher( int windowIndex, @Nullable MediaSource.MediaPeriodId mediaPeriodId )` Returns a `MediaSourceEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified window index and `MediaPeriodId`.
`final MediaSourceEventListener.EventDispatcher`	`createEventDispatcher( int windowIndex, @Nullable MediaSource.MediaPeriodId mediaPeriodId, long mediaTimeOffsetMs )` This method is deprecated. Use `createEventDispatcher` instead.
`final void`	`@UnstableApi disable(MediaSource.MediaSourceCaller caller)` Disables the source for the creation of `MediaPeriods`.
`final void`	`@UnstableApi enable(MediaSource.MediaSourceCaller caller)` Enables the source for the creation of `MediaPeriods`.
`final PlayerId`	`getPlayerId()` Returns the `PlayerId` of the player using this media source.
`final boolean`	`isEnabled()` Returns whether the source is enabled.
`final void`	`@UnstableApi prepareSource( MediaSource.MediaSourceCaller caller, @Nullable TransferListener mediaTransferListener )` This method is deprecated. Implement `prepareSource` instead.
`final void`	`@UnstableApi prepareSource( MediaSource.MediaSourceCaller caller, @Nullable TransferListener mediaTransferListener, PlayerId playerId )` Registers a `MediaSourceCaller`.
`final boolean`	`prepareSourceCalled()` Returns whether the source has `prepareSource` called.
`final void`	`refreshSourceInfo(Timeline timeline)` Updates timeline and manifest and notifies all listeners of the update.
`final void`	`@UnstableApi releaseSource(MediaSource.MediaSourceCaller caller)` Unregisters a caller, and disables and releases the source if no longer required.
`final void`	`@UnstableApi removeDrmEventListener(DrmSessionEventListener eventListener)` Removes a `DrmSessionEventListener` from the list of listeners which are notified of DRM events for this media source.
`final void`	`@UnstableApi removeEventListener(MediaSourceEventListener eventListener)` Removes a `MediaSourceEventListener` from the list of listeners which are notified of media source events.
`final void`	`setPlayerId(PlayerId playerId)` Sets the `PlayerId` of the player using this media source.

From androidx.media3.exoplayer.source.CompositeMediaSource

`final void`	`disableChildSource(@UnknownNull T id)` Disables a child source.
`void`	`@CallSuper disableInternal()` Disables the source, see `disable`.
`final void`	`enableChildSource(@UnknownNull T id)` Enables a child source.
`void`	`@CallSuper enableInternal()` Enables the source, see `enable`.
`void`	`@CallSuper maybeThrowSourceInfoRefreshError()` Throws any pending error encountered while loading or refreshing source information.
`final void`	`prepareChildSource(@UnknownNull T id, MediaSource mediaSource)` Prepares a child source.
`final void`	`releaseChildSource(@UnknownNull T id)` Releases a child source.
`void`	`@CallSuper releaseSourceInternal()` Releases the source, see `releaseSource`.

Protected fields

mediaSource

protected final MediaSource mediaSource

The wrapped child MediaSource.

Protected constructors

WrappingMediaSource

protected WrappingMediaSource(MediaSource mediaSource)

Creates the wrapping MediaSource.

Parameters
`MediaSource mediaSource`	The wrapped child `MediaSource`.

Public methods

canUpdateMediaItem

public boolean canUpdateMediaItem(MediaItem mediaItem)

Returns whether the for this source can be updated with the provided item.

Should not be called directly from application code.

This method must be called on the application thread.

This method can be overridden to change whether the MediaItem of the child source can be updated.

createPeriod

public MediaPeriod createPeriod(
    MediaSource.MediaPeriodId id,
    Allocator allocator,
    long startPositionUs
)

Creates the requested MediaPeriod.

This method typically forwards to the wrapped media source and optionally wraps the returned MediaPeriod.

See also
`createPeriod`

getInitialTimeline

public @Nullable Timeline getInitialTimeline()

Returns the initial placeholder timeline that is returned immediately when the real timeline is not yet known, or null to let the player create an initial timeline.

Should not be called directly from application code.

The initial timeline must use the same uids for windows and periods that the real timeline will use. It also must provide windows which are marked as dynamic to indicate that the window is expected to change when the real timeline arrives.

Any media source which has multiple windows should typically provide such an initial timeline to make sure the player reports the correct number of windows immediately.

This method must be called on the application thread.

getMediaItem

public MediaItem getMediaItem()

Returns the whose media is provided by the source.

Should not be called directly from application code.

This method must be called on the application thread.

This method can be overridden to amend the MediaItem of the child source. It is only used before the child source is prepared.

isSingleWindow

public boolean isSingleWindow()

Returns true if the media source is guaranteed to never have zero or more than one window.

Should not be called directly from application code.

The default implementation returns true.

This method must be called on the application thread.

Returns
`boolean`	true if the source has exactly one window.

releasePeriod

public void releasePeriod(MediaPeriod mediaPeriod)

Releases a MediaPeriod.

This method typically forwards to the wrapped media source and optionally unwraps the provided MediaPeriod.

See also
`releasePeriod`

updateMediaItem

public void updateMediaItem(MediaItem mediaItem)

Updates the for this source.

Should not be called directly from application code.

This method must be called on the playback thread and only if #canUpdateMediaItem returns true} for the new .

This method can be overridden to change how the MediaItem of the child source is updated.

Protected methods

disableChildSource

protected final void disableChildSource()

Disables the child source.

enableChildSource

protected final void enableChildSource()

Enables the child source.

getMediaPeriodIdForChildMediaPeriodId

protected @Nullable MediaSource.MediaPeriodId getMediaPeriodIdForChildMediaPeriodId(
    MediaSource.MediaPeriodId mediaPeriodId
)

Returns the MediaPeriodId in the wrapping source corresponding to the specified MediaPeriodId in a child source. The default implementation does not change the media period id.

Parameters
`MediaSource.MediaPeriodId mediaPeriodId`	A `MediaPeriodId` of the child source.

Returns
`@Nullable MediaSource.MediaPeriodId`	The corresponding `MediaPeriodId` in the wrapping source. Null if no corresponding media period id can be determined.

getMediaPeriodIdForChildMediaPeriodId

protected final @Nullable MediaSource.MediaPeriodId getMediaPeriodIdForChildMediaPeriodId(
    Void childSourceId,
    MediaSource.MediaPeriodId mediaPeriodId
)

Returns the MediaPeriodId in the composite source corresponding to the specified MediaPeriodId in a child source. The default implementation does not change the media period id.

Parameters
`Void childSourceId`	The unique id used to prepare the child source.
`MediaSource.MediaPeriodId mediaPeriodId`	A `MediaPeriodId` of the child source.

Returns
`@Nullable MediaSource.MediaPeriodId`	The corresponding `MediaPeriodId` in the composite source. Null if no corresponding media period id can be determined.

getMediaTimeForChildMediaTime

protected long getMediaTimeForChildMediaTime(
    long mediaTimeMs,
    @Nullable MediaSource.MediaPeriodId mediaPeriodId
)

Returns the media time in the MediaPeriod of the wrapping source corresponding to the specified media time in the MediaPeriod of the child source. The default implementation does not change the media time.

Parameters
`long mediaTimeMs`	A media time in the `MediaPeriod` of the child source, in milliseconds.
`@Nullable MediaSource.MediaPeriodId mediaPeriodId`	The `MediaPeriodId` of the `MediaPeriod` of the child source, or null if the time does not relate to a specific `MediaPeriod`.

Returns
`long`	The corresponding media time in the `MediaPeriod` of the wrapping source, in milliseconds.

getMediaTimeForChildMediaTime

protected final long getMediaTimeForChildMediaTime(
    Void childSourceId,
    long mediaTimeMs,
    @Nullable MediaSource.MediaPeriodId mediaPeriodId
)

Returns the media time in the MediaPeriod of the composite source corresponding to the specified media time in the MediaPeriod of the child source. The default implementation does not change the media time.

Parameters
`Void childSourceId`	The unique id used to prepare the child source.
`long mediaTimeMs`	A media time in the `MediaPeriod` of the child source, in milliseconds.
`@Nullable MediaSource.MediaPeriodId mediaPeriodId`	The `MediaPeriodId` of the `MediaPeriod` of the child source, or null if the time does not relate to a specific `MediaPeriod`.

Returns
`long`	The corresponding media time in the `MediaPeriod` of the composite source, in milliseconds.

getWindowIndexForChildWindowIndex

protected int getWindowIndexForChildWindowIndex(int windowIndex)

Returns the window index in the wrapping source corresponding to the specified window index in a child source. The default implementation does not change the window index.

Parameters
`int windowIndex`	A window index of the child source.

Returns
`int`	The corresponding window index in the wrapping source.

getWindowIndexForChildWindowIndex

protected final int getWindowIndexForChildWindowIndex(Void childSourceId, int windowIndex)

Returns the window index in the composite source corresponding to the specified window index in a child source. The default implementation does not change the window index.

Parameters
`Void childSourceId`	The unique id used to prepare the child source.
`int windowIndex`	A window index of the child source.

Returns
`int`	The corresponding window index in the composite source.

onChildSourceInfoRefreshed

protected void onChildSourceInfoRefreshed(Timeline newTimeline)

Called when the child source info has been refreshed.

This Timeline can be amended if needed, for example using ForwardingTimeline. The Timeline for the wrapping source needs to be published with refreshSourceInfo.

Parameters
`Timeline newTimeline`	The timeline of the child source.

onChildSourceInfoRefreshed

protected final void onChildSourceInfoRefreshed(
    Void childSourceId,
    MediaSource mediaSource,
    Timeline newTimeline
)

Called when the source info of a child source has been refreshed.

Parameters
`Void childSourceId`	The unique id used to prepare the child source.
`MediaSource mediaSource`	The child source whose source info has been refreshed.
`Timeline newTimeline`	The timeline of the child source.

prepareChildSource

protected final void prepareChildSource()

Prepares the wrapped child source.

onChildSourceInfoRefreshed will be called when the child source updates its timeline.

If sources aren't explicitly released with releaseChildSource they will be released in releaseSourceInternal.

prepareSourceInternal

protected void prepareSourceInternal()

Starts source preparation and enables the source, see prepareSource. This method is called at most once until the next call to releaseSourceInternal.

prepareSourceInternal

protected final void prepareSourceInternal(@Nullable TransferListener mediaTransferListener)

Starts source preparation and enables the source, see prepareSource. This method is called at most once until the next call to releaseSourceInternal.

This method is called on the playback thread.

Parameters
`@Nullable TransferListener mediaTransferListener`	The transfer listener which should be informed of any media data transfers. May be null if no listener is available. Note that this listener should usually be only informed of transfers related to the media loads and not of auxiliary loads for manifests and other data.

releaseChildSource

protected final void releaseChildSource()

Releases the child source.