DashDownloader

Artifact: androidx.media3:media3-exoplayer-dash

Kotlin |Java

@UnstableApi
public final class DashDownloader extends SegmentDownloader

java.lang.Object
↳	androidx.media3.exoplayer.offline.SegmentDownloader
	↳	androidx.media3.exoplayer.dash.offline.DashDownloader

A downloader for DASH streams.

Example usage:

SimpleCache cache = new SimpleCache(downloadFolder, new NoOpCacheEvictor(), databaseProvider);
CacheDataSource.Factory cacheDataSourceFactory =
    new CacheDataSource.Factory()
        .setCache(cache)
        .setUpstreamDataSourceFactory(new DefaultHttpDataSource.Factory());
// Create a downloader for the first representation of the first adaptation set of the first
// period.
DashDownloader dashDownloader =
    new DashDownloader(
        new MediaItem.Builder()
            .setUri(manifestUrl)
            .setStreamKeys(Collections.singletonList(new StreamKey(0, 0, 0)))
            .build(),
        cacheDataSourceFactory);
// Perform the download.
dashDownloader.download(progressListener);
// Use the downloaded data for playback.
DashMediaSource mediaSource =
    new DashMediaSource.Factory(cacheDataSourceFactory).createMediaSource(mediaItem);

Summary

Public constructors
`DashDownloader( MediaItem mediaItem, CacheDataSource.Factory cacheDataSourceFactory )` Creates a new instance.
`DashDownloader( MediaItem mediaItem, CacheDataSource.Factory cacheDataSourceFactory, Executor executor )` Creates a new instance.
`DashDownloader( MediaItem mediaItem, ParsingLoadable.Parser<DashManifest> manifestParser, CacheDataSource.Factory cacheDataSourceFactory, Executor executor )` This method is deprecated. Use `DashDownloader` instead.
`DashDownloader( MediaItem mediaItem, ParsingLoadable.Parser<DashManifest> manifestParser, CacheDataSource.Factory cacheDataSourceFactory, Executor executor, long maxMergedSegmentStartTimeDiffMs )` Creates a new instance.

Protected methods
`List<SegmentDownloader.Segment>`	`getSegments( DataSource dataSource, DashManifest manifest, boolean removing )` Returns a list of all downloadable `Segment`s for a given manifest.

Inherited Constants

From androidx.media3.exoplayer.offline.SegmentDownloader

static final long

DEFAULT_MAX_MERGED_SEGMENT_START_TIME_DIFF_MS = 20000

Inherited methods

From androidx.media3.exoplayer.offline.SegmentDownloader

`void`	`cancel()` Permanently cancels the downloading by this downloader.
`final void`	`download(@Nullable Downloader.ProgressListener progressListener)` Downloads the content.
`final T`	`<T> execute(RunnableFutureTask<T, Object> runnable, boolean removing)` Executes the provided `RunnableFutureTask`.
`static DataSpec`	`getCompressibleDataSpec(Uri uri)`
`final M`	`getManifest(DataSource dataSource, DataSpec dataSpec, boolean removing)` Loads and parses a manifest.
`final void`	`remove()` Removes the content.

Public constructors

DashDownloader

public DashDownloader(
    MediaItem mediaItem,
    CacheDataSource.Factory cacheDataSourceFactory
)

Creates a new instance.

Parameters
`MediaItem mediaItem`	The `MediaItem` to be downloaded.
`CacheDataSource.Factory cacheDataSourceFactory`	A `CacheDataSource.Factory` for the cache into which the download will be written.

DashDownloader

public DashDownloader(
    MediaItem mediaItem,
    CacheDataSource.Factory cacheDataSourceFactory,
    Executor executor
)

Creates a new instance.

Parameters
`MediaItem mediaItem`	The `MediaItem` to be downloaded.
`CacheDataSource.Factory cacheDataSourceFactory`	A `CacheDataSource.Factory` for the cache into which the download will be written.
`Executor executor`	An `Executor` used to make requests for the media being downloaded. Providing an `Executor` that uses multiple threads will speed up the download by allowing parts of it to be executed in parallel.

DashDownloader

public DashDownloader(
    MediaItem mediaItem,
    ParsingLoadable.Parser<DashManifest> manifestParser,
    CacheDataSource.Factory cacheDataSourceFactory,
    Executor executor
)

DashDownloader

public DashDownloader(
    MediaItem mediaItem,
    ParsingLoadable.Parser<DashManifest> manifestParser,
    CacheDataSource.Factory cacheDataSourceFactory,
    Executor executor,
    long maxMergedSegmentStartTimeDiffMs
)

Creates a new instance.

Parameters
`MediaItem mediaItem`	The `MediaItem` to be downloaded.
`ParsingLoadable.Parser<DashManifest> manifestParser`	A parser for DASH manifests.
`CacheDataSource.Factory cacheDataSourceFactory`	A `CacheDataSource.Factory` for the cache into which the download will be written.
`Executor executor`	An `Executor` used to make requests for the media being downloaded. Providing an `Executor` that uses multiple threads will speed up the download by allowing parts of it to be executed in parallel.
`long maxMergedSegmentStartTimeDiffMs`	The maximum difference of the start time of two segments, up to which the segments (of the same URI) should be merged into a single download segment, in milliseconds.

Protected methods

getSegments

protected List<SegmentDownloader.Segment> getSegments(
    DataSource dataSource,
    DashManifest manifest,
    boolean removing
)

Returns a list of all downloadable Segments for a given manifest. Any required data should be loaded using getManifest or execute.

Parameters
`DataSource dataSource`	The `DataSource` through which to load any required data.
`DashManifest manifest`	The manifest containing the segments.
`boolean removing`	Whether the segments are being obtained as part of a removal. If true then a partial segment list is returned in the case that a load error prevents all segments from being listed. If false then an `IOException` will be thrown in this case.

Returns
`List<SegmentDownloader.Segment>`	The list of downloadable `Segment`s.

Throws
`java.io.IOException`	Thrown if `allowPartialIndex` is false and an execution error occurs, or if the media is not in a form that allows for its segments to be listed.
`java.lang.InterruptedException`