# ExternallyLoadedMediaSource

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

*** ** * ** ***

<br />

```
@UnstableApi
class ExternallyLoadedMediaSource : BaseMediaSource
```

<br />

|---|---|---|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) |||
| ↳ | [androidx.media3.exoplayer.source.BaseMediaSource](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource) ||
|   | ↳ | [androidx.media3.exoplayer.source.ExternallyLoadedMediaSource](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource) |

*** ** * ** ***

A `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource` for media loaded outside of the usual ExoPlayer loading mechanism.

Puts the `https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem.LocalConfiguration#uri()` (encoded with `https://guava.dev/releases/snapshot-android/api/docs/com/google/common/base/Charsets.html#UTF_8`) in a single sample belonging to a single `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod`.

Typically used for image content that is managed by an external image management framework (for example, Glide).

## Summary

| ### Nested types |
|---|
| `class https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource.Factory : https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.Factory` Factory for `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource`. |

| ### Public functions |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#canUpdateMediaItem(androidx.media3.common.MediaItem)(mediaItem: https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem!)` Returns whether the `https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem` for this source can be updated with the provided item. |
| `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod!` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#createPeriod(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,androidx.media3.exoplayer.upstream.Allocator,long)( id: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId!, allocator: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/upstream/Allocator!, startPositionUs: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html )` Returns a new `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod` identified by `periodId`. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#maybeThrowSourceInfoRefreshError()()` Throws any pending error encountered while loading or refreshing source information. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#releasePeriod(androidx.media3.exoplayer.source.MediaPeriod)(mediaPeriod: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod!)` Releases the period. |
| `synchronized https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#updateMediaItem(androidx.media3.common.MediaItem)(mediaItem: https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem!)` Updates the `https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem` for this source. |

| ### Protected functions |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#prepareSourceInternal(androidx.media3.datasource.TransferListener)(mediaTransferListener: https://developer.android.com/reference/kotlin/androidx/media3/datasource/TransferListener?)` Starts source preparation and enables the source, see `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/ExternallyLoadedMediaSource#releaseSourceInternal()()` Releases the source, see `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`. |

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

### Inherited functions

From [androidx.media3.exoplayer.source.BaseMediaSource](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource) `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#addDrmEventListener(android.os.Handler,androidx.media3.exoplayer.drm.DrmSessionEventListener)(

handler: https://developer.android.com/reference/android/os/Handler.html!,

eventListener: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/drm/DrmSessionEventListener!

)`

Adds a `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/drm/DrmSessionEventListener` to the list of listeners which are notified of DRM events for this media source.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#addEventListener(android.os.Handler,androidx.media3.exoplayer.source.MediaSourceEventListener)(

handler: https://developer.android.com/reference/android/os/Handler.html!,

eventListener: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener!

)`

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

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

windowIndex: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html,

mediaPeriodId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId?

)`

Returns a `https://developer.android.com/reference/kotlin/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/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`.
`https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher!` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(mediaPeriodId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId?)`

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

mediaPeriodId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId!,

mediaTimeOffsetMs: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html

)`

**This function is deprecated.**

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

<br />

`https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher!` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId)(

windowIndex: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html,

mediaPeriodId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId?

)`

Returns a `https://developer.android.com/reference/kotlin/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/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId`.
`https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener.EventDispatcher!` `[createEventDispatcher](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#createEventDispatcher(int,androidx.media3.exoplayer.source.MediaSource.MediaPeriodId,long))(

windowIndex: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html,

mediaPeriodId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId?,

mediaTimeOffsetMs: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html

)`

**This function is deprecated.**

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

<br />

`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#disable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(caller: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller!)`

Disables the source for the creation of `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod`.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#disableInternal()()`

Disables the source, see `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#disable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(caller: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller!)`

Enables the source for the creation of `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaPeriod`.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#enableInternal()()`

Enables the source, see `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#enable(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)`.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#isEnabled()()`

Returns whether the source is enabled.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)(

caller: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller!,

playerId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/analytics/PlayerId!,

bandwidthMeter: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/upstream/BandwidthMeter!

)`

Registers a `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller`.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#prepareSourceCalled()()`

Returns whether the source has `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)` called.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#refreshSourceInfo(androidx.media3.common.Timeline)(timeline: https://developer.android.com/reference/kotlin/androidx/media3/common/Timeline!)`

Updates timeline and manifest and notifies all listeners of the update.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#releaseSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller)(caller: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller!)`

Unregisters a caller, and disables and releases the source if no longer required.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#removeDrmEventListener(androidx.media3.exoplayer.drm.DrmSessionEventListener)(eventListener: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/drm/DrmSessionEventListener!)`

Removes a `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/drm/DrmSessionEventListener` from the list of listeners which are notified of DRM events for this media source.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#removeEventListener(androidx.media3.exoplayer.source.MediaSourceEventListener)(eventListener: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener!)`

Removes a `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSourceEventListener` from the list of listeners which are notified of media source events.
From [androidx.media3.exoplayer.source.MediaSource](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource) `https://developer.android.com/reference/kotlin/androidx/media3/common/Timeline?` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#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://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#isSingleWindow()()`

Returns true if the media source is guaranteed to never have zero or more than one window.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `@https://developer.android.com/reference/kotlin/androidx/media3/common/util/UnstableApi
[prepareSource](https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.datasource.TransferListener,androidx.media3.exoplayer.analytics.PlayerId))(

caller: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaSourceCaller!,

mediaTransferListener: https://developer.android.com/reference/kotlin/androidx/media3/datasource/TransferListener?,

playerId: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/analytics/PlayerId!

)`

**This function is deprecated.**

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

<br />

### Inherited properties

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

## Public functions

### canUpdateMediaItem

```
fun canUpdateMediaItem(mediaItem: MediaItem!): Boolean
```

Returns whether the `https://developer.android.com/reference/kotlin/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 |
|---|---|
| `mediaItem: https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem!` | The new `https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem`. |

| Returns |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | Whether the source can be updated using this item. |

### createPeriod

```
fun createPeriod(
    id: MediaSource.MediaPeriodId!,
    allocator: Allocator!,
    startPositionUs: Long
): MediaPeriod!
```

Returns a new `https://developer.android.com/reference/kotlin/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 |
|---|---|
| `id: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource.MediaPeriodId!` | The identifier of the period. |
| `allocator: https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/upstream/Allocator!` | An `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/upstream/Allocator` from which to obtain media buffer allocations. |
| `startPositionUs: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html` | The expected start position, in microseconds. |

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

### maybeThrowSourceInfoRefreshError

```
fun maybeThrowSourceInfoRefreshError(): Unit
```

Throws any pending error encountered while loading or refreshing source information.

Should not be called directly from application code.

This method must be called on the playback thread and only after `https://developer.android.com/reference/kotlin/androidx/media3/exoplayer/source/MediaSource#prepareSource(androidx.media3.exoplayer.source.MediaSource.MediaSourceCaller,androidx.media3.exoplayer.analytics.PlayerId,androidx.media3.exoplayer.upstream.BandwidthMeter)`.

### releasePeriod

```
fun releasePeriod(mediaPeriod: MediaPeriod!): Unit
```

Releases the period.

Should not be called directly from application code.

This method must be called on the playback thread.

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

### updateMediaItem

```
synchronized fun updateMediaItem(mediaItem: MediaItem!): Unit
```

Updates the `https://developer.android.com/reference/kotlin/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/kotlin/androidx/media3/exoplayer/source/MediaSource#canUpdateMediaItem(androidx.media3.common.MediaItem)` returns `true` for the new `https://developer.android.com/reference/kotlin/androidx/media3/common/MediaItem`.

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

## Protected functions

### prepareSourceInternal

```
protected fun prepareSourceInternal(mediaTransferListener: TransferListener?): Unit
```

Starts source preparation and enables the source, see `https://developer.android.com/reference/kotlin/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/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#releaseSourceInternal()`.

This method is called on the playback thread.

| Parameters |
|---|---|
| `mediaTransferListener: https://developer.android.com/reference/kotlin/androidx/media3/datasource/TransferListener?` | 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 fun releaseSourceInternal(): Unit
```

Releases the source, see `https://developer.android.com/reference/kotlin/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/kotlin/androidx/media3/exoplayer/source/BaseMediaSource#prepareSourceInternal(androidx.media3.datasource.TransferListener)`.

This method is called on the playback thread.

## Public properties

### mediaItem

```
@GuardedBy(value = "this")
val mediaItem: MediaItem!
```