AssetLoader

Artifact: androidx.media3:media3-transformer

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Kotlin |Java

@UnstableApi
interface AssetLoader

Known direct subclasses

ExoPlayerAssetLoader, ImageAssetLoader, TextureAssetLoader

ExoPlayerAssetLoader	An AssetLoader implementation that uses an ExoPlayer to load samples.
ImageAssetLoader	An AssetLoader implementation that loads images into Bitmap instances.
TextureAssetLoader	An AssetLoader implementation that loads videos from traditional GLES texture instances.

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Provides media data to a Transformer.

The output samples can be encoded or decoded.

Only audio and video samples are supported. Both audio and video tracks can be provided by a single asset loader, but outputting multiple tracks of the same type is not supported.

An asset loader is responsible for removing audio or video if requested.

If slow motion flattening is requested, the asset loader should flatten the video track for media containing slow motion markers. This is usually done prior to decoding. The audio samples are flattened after they are output by the AssetLoader, because this is done on decoded samples.

Summary

Nested types
interface AssetLoader.Factory A factory for AssetLoader instances.
interface AssetLoader.Listener A listener of AssetLoader events.
@Documented @Retention(value = RetentionPolicy.SOURCE) @Target(value = TYPE_USE) @IntDef(flag = true, value = ) annotation AssetLoader.SupportedOutputTypes Supported output types of an asset loader.

Constants
const Int	SUPPORTED_OUTPUT_TYPE_DECODED = 2 Indicates that the asset loader can output decoded samples.
const Int	SUPPORTED_OUTPUT_TYPE_ENCODED = 1 Indicates that the asset loader can output encoded samples.

Public functions
ImmutableMap<Int!, String!>!	getDecoderNames() Return the used decoders' names.
Int	@Transformer.ProgressState getProgress(progressHolder: ProgressHolder!) Returns the current Transformer.ProgressState and updates progressHolder with the current progress if it is available.
Unit	release() Stops loading data and releases all resources associated with the asset loader.
Unit	start() Starts the asset loader.

Constants

SUPPORTED_OUTPUT_TYPE_DECODED

const val SUPPORTED_OUTPUT_TYPE_DECODED = 2: Int

Indicates that the asset loader can output decoded samples.

SUPPORTED_OUTPUT_TYPE_ENCODED

const val SUPPORTED_OUTPUT_TYPE_ENCODED = 1: Int

Indicates that the asset loader can output encoded samples.

Public functions

getDecoderNames

fun getDecoderNames(): ImmutableMap<Int!, String!>!

Return the used decoders' names.

Returns
ImmutableMap<Int!, String!>!	The decoders' names keyed by track type.

getProgress

@Transformer.ProgressState
fun getProgress(progressHolder: ProgressHolder!): Int

Returns the current Transformer.ProgressState and updates progressHolder with the current progress if it is available.

Parameters
progressHolder: ProgressHolder!	A ProgressHolder, updated to hold the percentage progress if available.

Returns
Int	The Transformer.ProgressState.

release

fun release(): Unit

Stops loading data and releases all resources associated with the asset loader.

start

fun start(): Unit

Starts the asset loader.