# WrappingMediaSource

Artifact: [androidx.media3:media3-exoplayer](https://developer.android.com/jetpack/androidx/releases/media3) [View Source](https://cs.android.com/search?q=file:androidx/media3/exoplayer/source/WrappingMediaSource.java+class:androidx.media3.exoplayer.source.WrappingMediaSource)

*** ** * ** ***


```
@UnstableApi
public abstract class WrappingMediaSource extends CompositeMediaSource<Void>
```

<br />

|---|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object.html) ||||
| ↳ | [androidx.media3.exoplayer.source.BaseMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource) |||
|   | ↳ | [androidx.media3.exoplayer.source.CompositeMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource)\<[Void](https://developer.android.com/reference/java/lang/Void.html)\> ||
|   |   | ↳ | [androidx.media3.exoplayer.source.WrappingMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource) |

Known direct subclasses [ClippingMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/ClippingMediaSource), [FilteringMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/FilteringMediaSource), [LoopingMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/LoopingMediaSource), [MaskingMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/MaskingMediaSource), [PreloadMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/preload/PreloadMediaSource)

|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/ClippingMediaSource` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` that wraps a source and clips its timeline based on specified start/end positions. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/FilteringMediaSource` | A `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` that filters the available `https://developer.android.com/reference/androidx/media3/common/C.TrackType`. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/LoopingMediaSource` | **This class is deprecated.** To loop a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` indefinitely, use `https://developer.android.com/reference/androidx/media3/common/Player#setRepeatMode(int)` instead of this class. <br /> |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MaskingMediaSource` | A `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` that masks the `https://developer.android.com/reference/androidx/media3/common/Timeline` with a placeholder until the actual media structure is known. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/preload/PreloadMediaSource` | Preloads a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` and provides a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` that has data loaded before playback. |

*** ** * ** ***

An abstract `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` wrapping a single child `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`.

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

- `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaItem()`: Amend the `https://developer.android.com/reference/androidx/media3/common/MediaItem` for this media source. This is only used before the child source is prepared. You may also want to override `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#canUpdateMediaItem(androidx.media3.common.MediaItem)` or `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#updateMediaItem(androidx.media3.common.MediaItem)` to intercept further updates to the `https://developer.android.com/reference/androidx/media3/common/MediaItem`.
- `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#onChildSourceInfoRefreshed(androidx.media3.common.Timeline)`: Called whenever the child source's `https://developer.android.com/reference/androidx/media3/common/Timeline` changed. This `https://developer.android.com/reference/androidx/media3/common/Timeline` can be amended if needed, for example using `https://developer.android.com/reference/androidx/media3/exoplayer/source/ForwardingTimeline`. The `https://developer.android.com/reference/androidx/media3/common/Timeline` for the wrapping source needs to be published with `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#refreshSourceInfo(androidx.media3.common.Timeline)`.
- `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#createPeriod(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,androidx.media3.exoplayer.upstream.Allocator,long)`/`https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#releasePeriod(androidx.media3.exoplayer.source.MediaPeriod)`: These methods create and release `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` instances. They typically forward to the wrapped media source and optionally wrap the returned `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.

Other methods like `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#prepareSourceInternal(androidx.media3.datasource.TransferListener)`, `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#enableInternal()`, `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#disableInternal()` or `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#releaseSourceInternal()` only need to be overwritten if required for resource management.

## Summary

| ### Protected fields |
|---|---|
| `final https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#mediaSource()` The wrapped child `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`. |

| ### Protected constructors |
|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#WrappingMediaSource(androidx.media3.exoplayer.source.MediaSource)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource mediaSource)` Creates the wrapping `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`. |

| ### Public methods |
|---|---|
| `boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#canUpdateMediaItem(androidx.media3.common.MediaItem)(https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem)` Returns whether the for this source can be updated with the provided item. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#createPeriod(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,androidx.media3.exoplayer.upstream.Allocator,long)( https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId id, https://developer.android.com/reference/androidx/media3/exoplayer/upstream/Allocator allocator, long startPositionUs )` Creates the requested `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`. |
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/common/Timeline` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#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. |
| `https://developer.android.com/reference/androidx/media3/common/MediaItem` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaItem()()` Returns the whose media is provided by the source. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#isSingleWindow()()` Returns true if the media source is guaranteed to never have zero or more than one window. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#releasePeriod(androidx.media3.exoplayer.source.MediaPeriod)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod mediaPeriod)` Releases a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#updateMediaItem(androidx.media3.common.MediaItem)(https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem)` Updates the for this source. |

| ### Protected methods |
|---|---|
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#disableChildSource()()` Disables the child source. |
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#enableChildSource()()` Enables the child source. |
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaPeriodIdForChildMediaPeriodId(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId )` Returns the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in the wrapping source corresponding to the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in a child source. |
| `final @https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaPeriodIdForChildMediaPeriodId(java.lang.Void,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( https://developer.android.com/reference/java/lang/Void.html childSourceId, https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId )` Returns the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in the composite source corresponding to the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in a child source. |
| `long` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaTimeForChildMediaTime(long,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( long mediaTimeMs, @https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId )` Returns the media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the wrapping source corresponding to the specified media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source. |
| `final long` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getMediaTimeForChildMediaTime(java.lang.Void,long,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( https://developer.android.com/reference/java/lang/Void.html childSourceId, long mediaTimeMs, @https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId )` Returns the media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the composite source corresponding to the specified media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source. |
| `int` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getWindowIndexForChildWindowIndex(int)(int windowIndex)` Returns the window index in the wrapping source corresponding to the specified window index in a child source. |
| `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#getWindowIndexForChildWindowIndex(java.lang.Void,int)(https://developer.android.com/reference/java/lang/Void.html childSourceId, int windowIndex)` Returns the window index in the composite source corresponding to the specified window index in a child source. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#onChildSourceInfoRefreshed(androidx.media3.common.Timeline)(https://developer.android.com/reference/androidx/media3/common/Timeline newTimeline)` Called when the child source info has been refreshed. |
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#onChildSourceInfoRefreshed(java.lang.Void,androidx.media3.exoplayer.source.MediaSource,androidx.media3.common.Timeline)( https://developer.android.com/reference/java/lang/Void.html childSourceId, https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource mediaSource, https://developer.android.com/reference/androidx/media3/common/Timeline newTimeline )` Called when the source info of a child source has been refreshed. |
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#prepareChildSource()()` Prepares the wrapped child source. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#prepareSourceInternal()()` Starts source preparation and enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`. |
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#prepareSourceInternal(androidx.media3.datasource.TransferListener)(@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/datasource/TransferListener mediaTransferListener)` Starts source preparation and enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`. |
| `final void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#releaseChildSource()()` Releases the child source. |

### Inherited fields

From [androidx.media3.exoplayer.source.BaseMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource) `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#bandwidthMeter()` `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#playerId()`

### Inherited methods

From [androidx.media3.exoplayer.source.BaseMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource) `final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#addDrmEventListener(android.os.Handler,androidx.media3.exoplayer.drm.DrmSessionEventListener)(
https://developer.android.com/reference/android/os/Handler.html handler,
https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener eventListener
)`

Adds a `https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener` to the list of listeners which are notified of DRM events for this media source.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#addEventListener(android.os.Handler,androidx.media3.exoplayer.source.MediaSourceEventListener)(
https://developer.android.com/reference/android/os/Handler.html handler,
https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener eventListener
)`

Adds a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener` to the list of listeners which are notified of media source events.
`final https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener.EventDispatcher` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createDrmEventDispatcher(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(
@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId
)`

Returns a `https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`
`final https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener.EventDispatcher` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createDrmEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(
int windowIndex,
@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId
)`

Returns a `https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified window index and `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`.
`final https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId)`

Returns a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`.
`final https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` `[createEventDispatcher](https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,long))(
https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId,
long mediaTimeOffsetMs
)`

**This method is deprecated.**

Use `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)` instead.

<br />

`final https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(
int windowIndex,
@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId
)`

Returns a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` which dispatches all events to the registered listeners with the specified window index and `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`.
`final https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher` `[createEventDispatcher](https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,long))(
int windowIndex,
@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId,
long mediaTimeOffsetMs
)`

**This method is deprecated.**

Use `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)` instead.

<br />

`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#disable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller caller)`

Disables the source for the creation of `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller caller)`

Enables the source for the creation of `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.
`final https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#getBandwidthMeter()()`

Returns the `https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter` that is used by this media source.
`final https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#getPlayerId()()`

Returns the `https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId` of the player using this media source.
`final boolean` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#isEnabled()()`

Returns whether the source is enabled.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)(
https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller caller,
https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId playerId,
https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter bandwidthMeter
)`

Registers a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller`.
`final boolean` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#prepareSourceCalled()()`

Returns whether the source has `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)` called.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#refreshSourceInfo(androidx.media3.common.Timeline)(https://developer.android.com/reference/androidx/media3/common/Timeline timeline)`

Updates timeline and manifest and notifies all listeners of the update.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller caller)`

Unregisters a caller, and disables and releases the source if no longer required.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#removeDrmEventListener(androidx.media3.exoplayer.drm.DrmSessionEventListener)(https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener eventListener)`

Removes a `https://developer.android.com/reference/androidx/media3/exoplayer/drm/DrmSessionEventListener` from the list of listeners which are notified of DRM events for this media source.
`final void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#removeEventListener(androidx.media3.exoplayer.source.MediaSourceEventListener)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener eventListener)`

Removes a `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSourceEventListener` from the list of listeners which are notified of media source events.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#setBandwidthMeter(androidx.media3.exoplayer.upstream.BandwidthMeter)(https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter bandwidthMeter)`

Sets the `https://developer.android.com/reference/androidx/media3/exoplayer/upstream/BandwidthMeter` to be used by this media source.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#setPlayerId(androidx.media3.exoplayer.analytics.PlayerId)(https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId playerId)`

Sets the `https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId` of the player using this media source.
From [androidx.media3.exoplayer.source.CompositeMediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource) `final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#disableChildSource(T)(@https://developer.android.com/reference/androidx/media3/common/util/UnknownNull T id)`

Disables a child source.
`void` `@https://developer.android.com/reference/androidx/annotation/CallSuper
https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#disableInternal()()`

Disables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#disable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#enableChildSource(T)(@https://developer.android.com/reference/androidx/media3/common/util/UnknownNull T id)`

Enables a child source.
`void` `@https://developer.android.com/reference/androidx/annotation/CallSuper
https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#enableInternal()()`

Enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.
`void` `@https://developer.android.com/reference/androidx/annotation/CallSuper
https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#maybeThrowSourceInfoRefreshError()()`

Throws any pending error encountered while loading or refreshing source information.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#prepareChildSource(T,androidx.media3.exoplayer.source.MediaSource)(@https://developer.android.com/reference/androidx/media3/common/util/UnknownNull T id, https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource mediaSource)`

Prepares a child source.
`final void` `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#releaseChildSource(T)(@https://developer.android.com/reference/androidx/media3/common/util/UnknownNull T id)`

Releases a child source.
`void` `@https://developer.android.com/reference/androidx/annotation/CallSuper
https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#releaseSourceInternal()()`

Releases the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.
From [androidx.media3.exoplayer.source.MediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource) `void` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
[prepareSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.datasource.TransferListener,androidx.media3.exoplayer.analytics.PlayerId))(
https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller caller,
@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/datasource/TransferListener mediaTransferListener,
https://developer.android.com/reference/androidx/media3/exoplayer/analytics/PlayerId playerId
)`

**This method is deprecated.**

Use `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)` instead.

<br />

## Protected fields

### mediaSource

```
protected final MediaSource mediaSource
```

The wrapped child `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`.

## Protected constructors

### WrappingMediaSource

```
protected WrappingMediaSource(MediaSource mediaSource)
```

Creates the wrapping `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource mediaSource` | The wrapped child `https://developer.android.com/reference/androidx/media3/exoplayer/source/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 `https://developer.android.com/reference/androidx/media3/common/MediaItem` of the child source can be updated.

### createPeriod

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

Creates the requested `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.

This method typically forwards to the wrapped media source and optionally wraps the returned `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#createPeriod(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,androidx.media3.exoplayer.upstream.Allocator,long)` |   |

### 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 `https://developer.android.com/reference/androidx/media3/common/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 `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.

This method typically forwards to the wrapped media source and optionally unwraps the provided `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`.

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#releasePeriod(androidx.media3.exoplayer.source.MediaPeriod)` |   |

### 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 `https://developer.android.com/reference/androidx/media3/common/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 `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in the wrapping source corresponding to the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in a child source. The default implementation does not change the media period id.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId` | A `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` of the child source. |

| Returns |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` | The corresponding `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.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 `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in the composite source corresponding to the specified `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` in a child source. The default implementation does not change the media period id.

| Parameters |
|---|---|
| `https://developer.android.com/reference/java/lang/Void.html childSourceId` | The unique id used to prepare the child source. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId` | A `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` of the child source. |

| Returns |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` | The corresponding `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.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 `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the wrapping source corresponding to the specified media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source. The default implementation does not change the media time.

| Parameters |
|---|---|
| `long mediaTimeMs` | A media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source, in milliseconds. |
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId` | The `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` of the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source, or null if the time does not relate to a specific `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`. |

| Returns |
|---|---|
| `long` | The corresponding media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/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 `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the composite source corresponding to the specified media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source. The default implementation does not change the media time.

| Parameters |
|---|---|
| `https://developer.android.com/reference/java/lang/Void.html childSourceId` | The unique id used to prepare the child source. |
| `long mediaTimeMs` | A media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source, in milliseconds. |
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId mediaPeriodId` | The `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId` of the `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` of the child source, or null if the time does not relate to a specific `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`. |

| Returns |
|---|---|
| `long` | The corresponding media time in the `https://developer.android.com/reference/androidx/media3/exoplayer/source/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 |
|---|---|
| `https://developer.android.com/reference/java/lang/Void.html 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 `https://developer.android.com/reference/androidx/media3/common/Timeline` can be amended if needed, for example using `https://developer.android.com/reference/androidx/media3/exoplayer/source/ForwardingTimeline`. The `https://developer.android.com/reference/androidx/media3/common/Timeline` for the wrapping source needs to be published with `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#refreshSourceInfo(androidx.media3.common.Timeline)`.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/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 |
|---|---|
| `https://developer.android.com/reference/java/lang/Void.html childSourceId` | The unique id used to prepare the child source. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource mediaSource` | The child source whose source info has been refreshed. |
| `https://developer.android.com/reference/androidx/media3/common/Timeline newTimeline` | The timeline of the child source. |

### prepareChildSource

```
protected final void prepareChildSource()
```

Prepares the wrapped child source.

`https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#onChildSourceInfoRefreshed(androidx.media3.common.Timeline)` will be called when the child source updates its timeline.

If sources aren't explicitly released with `https://developer.android.com/reference/androidx/media3/exoplayer/source/WrappingMediaSource#releaseChildSource()` they will be released in `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#releaseSourceInternal()`.

### prepareSourceInternal

```
protected void prepareSourceInternal()
```

Starts source preparation and enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`. This method is called at most once until the next call to `https://developer.android.com/reference/androidx/media3/exoplayer/source/CompositeMediaSource#releaseSourceInternal()`.

### prepareSourceInternal

```
protected final void prepareSourceInternal(@Nullable TransferListener mediaTransferListener)
```

Starts source preparation and enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`. This method is called at most once until the next call to `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#releaseSourceInternal()`.

This method is called on the playback thread.

| Parameters |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/androidx/media3/datasource/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.