# ConcatenatingMediaSource2

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/ConcatenatingMediaSource2.java+class:androidx.media3.exoplayer.source.ConcatenatingMediaSource2)

*** ** * ** ***


```
@UnstableApi
public final class ConcatenatingMediaSource2 extends CompositeMediaSource<Integer>
```

<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)\<[Integer](https://developer.android.com/reference/java/lang/Integer.html)\> ||
|   |   | ↳ | [androidx.media3.exoplayer.source.ConcatenatingMediaSource2](https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2) |

*** ** * ** ***

Concatenates multiple `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource`, combining everything in one single `https://developer.android.com/reference/androidx/media3/common/Timeline.Window`.

This class can be used under the following conditions:

- All sources must be non-empty.
- The `https://developer.android.com/reference/androidx/media3/common/Timeline.Window#getPositionInFirstPeriodUs()` in all windows (except for the first one) must not change during the lifetime of this media source. This excludes, for example, live streams with moving live windows or dynamic updates to the clipping start time of a `https://developer.android.com/reference/androidx/media3/exoplayer/source/ClippingMediaSource`.

## Summary

| ### Nested types |
|---|
| `public final class https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2.Builder` A builder for `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2` instances. |

| ### Public fields |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/MediaItem` | `@https://developer.android.com/reference/androidx/annotation/GuardedBy(value = "this") https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#mediaItem()` |

| ### Public methods |
|---|---|
| `boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#canUpdateMediaItem(androidx.media3.common.MediaItem)(https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem)` Returns whether the `https://developer.android.com/reference/androidx/media3/common/MediaItem` 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/ConcatenatingMediaSource2#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 )` Returns a new `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` identified by `periodId`. |
| `@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/ConcatenatingMediaSource2#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. |
| `synchronized https://developer.android.com/reference/androidx/media3/common/MediaItem` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#getMediaItem()()` Returns the `https://developer.android.com/reference/androidx/media3/common/MediaItem` whose media is provided by the source. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#releasePeriod(androidx.media3.exoplayer.source.MediaPeriod)(https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod mediaPeriod)` Releases the period. |
| `synchronized void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#updateMediaItem(androidx.media3.common.MediaItem)(https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem)` Updates the `https://developer.android.com/reference/androidx/media3/common/MediaItem` for this source. |

| ### Protected methods |
|---|---|
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#enableInternal()()` Enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`. |
| `@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/ConcatenatingMediaSource2#getMediaPeriodIdForChildMediaPeriodId(java.lang.Integer,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( https://developer.android.com/reference/java/lang/Integer.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/ConcatenatingMediaSource2#getMediaTimeForChildMediaTime(java.lang.Integer,long,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)( https://developer.android.com/reference/java/lang/Integer.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/ConcatenatingMediaSource2#getWindowIndexForChildWindowIndex(java.lang.Integer,int)( https://developer.android.com/reference/java/lang/Integer.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/ConcatenatingMediaSource2#onChildSourceInfoRefreshed(java.lang.Integer,androidx.media3.exoplayer.source.MediaSource,androidx.media3.common.Timeline)( https://developer.android.com/reference/java/lang/Integer.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. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#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)`. |
| `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/source/ConcatenatingMediaSource2#releaseSourceInternal()()` Releases the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`. |

### 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#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.
From [androidx.media3.exoplayer.source.MediaSource](https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource) `boolean` `@https://developer.android.com/reference/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#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/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 />

## Public fields

### mediaItem

```
@GuardedBy(value = "this")
public MediaItem mediaItem
```

## Public methods

### canUpdateMediaItem

```
public boolean canUpdateMediaItem(MediaItem mediaItem)
```

Returns whether the `https://developer.android.com/reference/androidx/media3/common/MediaItem` 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.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem` | The new `https://developer.android.com/reference/androidx/media3/common/MediaItem`. |

| Returns |
|---|---|
| `boolean` | Whether the source can be updated using this item. |

### createPeriod

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

Returns a new `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` identified by `periodId`.

Should not be called directly from application code.

This method must be called on the playback thread and only if the source is enabled.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId id` | The identifier of the period. |
| `https://developer.android.com/reference/androidx/media3/exoplayer/upstream/Allocator allocator` | An `https://developer.android.com/reference/androidx/media3/exoplayer/upstream/Allocator` from which to obtain media buffer allocations. |
| `long startPositionUs` | The expected start position, in microseconds. |

| Returns |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod` | A new `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod`. |

### 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

```
synchronized public MediaItem getMediaItem()
```

Returns the `https://developer.android.com/reference/androidx/media3/common/MediaItem` whose media is provided by the source.

Should not be called directly from application code.

This method must be called on the application thread.

### releasePeriod

```
public void releasePeriod(MediaPeriod mediaPeriod)
```

Releases the period.

Should not be called directly from application code.

This method must be called on the playback thread.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaPeriod mediaPeriod` | The period to release. |

### updateMediaItem

```
synchronized public void updateMediaItem(MediaItem mediaItem)
```

Updates the `https://developer.android.com/reference/androidx/media3/common/MediaItem` for this source.

Should not be called directly from application code.

This method must be called on the playback thread and only if `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#canUpdateMediaItem(androidx.media3.common.MediaItem)` returns `true` for the new `https://developer.android.com/reference/androidx/media3/common/MediaItem`.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/MediaItem mediaItem` | The new `https://developer.android.com/reference/androidx/media3/common/MediaItem`. |

## Protected methods

### enableInternal

```
protected void enableInternal()
```

Enables the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.

### getMediaPeriodIdForChildMediaPeriodId

```
protected @Nullable MediaSource.MediaPeriodId getMediaPeriodIdForChildMediaPeriodId(
    Integer 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/Integer.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(
    Integer 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/Integer.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(
    Integer 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/Integer.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(
    Integer 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/Integer.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. |

### prepareSourceInternal

```
protected 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. |

### releaseSourceInternal

```
protected void releaseSourceInternal()
```

Releases the source, see `https://developer.android.com/reference/androidx/media3/exoplayer/source/MediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`. This method is called exactly once after each call to `https://developer.android.com/reference/androidx/media3/exoplayer/source/BaseMediaSource#prepareSourceInternal(androidx.media3.datasource.TransferListener)`.

This method is called on the playback thread.