DataSource

Artifact: androidx.media3:media3-datasource

Kotlin |Java

public interface DataSource extends DataReader

Known direct subclasses

AesCipherDataSource, BaseDataSource, CacheDataSource, DefaultDataSource, HttpDataSource, PlaceholderDataSource, PriorityDataSource, ResolvingDataSource, StatsDataSource, TeeDataSource

`AesCipherDataSource`	A `DataSource` that decrypts the data read from an upstream source.
`BaseDataSource`	Base `DataSource` implementation to keep a list of `TransferListener`s.
`CacheDataSource`	A `DataSource` that reads and writes a `Cache`.
`DefaultDataSource`	A `DataSource` that supports multiple URI schemes.
`HttpDataSource`	An HTTP `DataSource`.
`PlaceholderDataSource`	A DataSource which provides no data.
`PriorityDataSource`	A `DataSource` that can be used as part of a task registered with a `PriorityTaskManager`.
`ResolvingDataSource`	`DataSource` wrapper allowing just-in-time resolution of `DataSpecs`.
`StatsDataSource`	`DataSource` wrapper which keeps track of bytes transferred, redirected uris, and response headers.
`TeeDataSource`	Tees data into a `DataSink` as the data is read.

Known indirect subclasses

AssetDataSource, ByteArrayDataSource, ContentDataSource, CronetDataSource, DataSchemeDataSource, DefaultHttpDataSource, FakeDataSource, FileDataSource, FileDescriptorDataSource, HttpEngineDataSource, MediaDataSourceAdapter, OkHttpDataSource, RawResourceDataSource, RtmpDataSource, UdpDataSource

`AssetDataSource`	A `DataSource` for reading from a local asset.
`ByteArrayDataSource`	A `DataSource` for reading from a byte array.
`ContentDataSource`	A `DataSource` for reading from a content URI.
`CronetDataSource`	DataSource without intermediate buffer based on Cronet API set using UrlRequest.
`DataSchemeDataSource`	A `DataSource` for reading data URLs, as defined by RFC 2397.
`DefaultHttpDataSource`	An `HttpDataSource` that uses Android's `HttpURLConnection`.
`FakeDataSource`	A fake `DataSource` capable of simulating various scenarios.
`FileDataSource`	A `DataSource` for reading local files.
`FileDescriptorDataSource`	A `DataSource` for reading from a `FileDescriptor`.
`HttpEngineDataSource`	DataSource without intermediate buffer based on `HttpEngine` set using `UrlRequest`.
`MediaDataSourceAdapter`	A `DataSource` for reading from a `MediaDataSource`.
`OkHttpDataSource`	An `HttpDataSource` that delegates to Square's `Call.Factory`.
`RawResourceDataSource`	A `DataSource` for reading a raw resource.
`RtmpDataSource`	A Real-Time Messaging Protocol (RTMP) `DataSource`.
`UdpDataSource`	A UDP `DataSource`.

Reads data from URI-identified resources.

Summary

Nested types
`public interface DataSource.Factory` A factory for `DataSource` instances.

Public methods
`abstract void`	`@UnstableApi addTransferListener(TransferListener transferListener)` Adds a `TransferListener` to listen to data transfers.
`abstract void`	`@UnstableApi close()` Closes the source.
`default Map<String, List<String>>`	`@UnstableApi getResponseHeaders()` When the source is open, returns the response headers associated with the last `open` call.
`abstract @Nullable Uri`	`@UnstableApi getUri()` When the source is open, returns the `Uri` from which data is being read.
`abstract long`	`@UnstableApi open(DataSpec dataSpec)` Opens the source to read the specified data.

Inherited methods

From androidx.media3.common.DataReader

abstract int

read(byte[] buffer, int offset, int length)

Reads up to length bytes of data from the input.

Public methods

addTransferListener

@UnstableApi
abstract void addTransferListener(TransferListener transferListener)

Adds a TransferListener to listen to data transfers. This method is not thread-safe.

Parameters
`TransferListener transferListener`	A `TransferListener`.

close

@UnstableApi
abstract void close()

Closes the source. This method must be called even if the corresponding call to open threw an IOException.

Throws
`java.io.IOException`	If an error occurs closing the source.

getResponseHeaders

@UnstableApi
default Map<String, List<String>> getResponseHeaders()

When the source is open, returns the response headers associated with the last open call. Otherwise, returns an empty map.

Key look-up in the returned map is case-insensitive.

getUri

@UnstableApi
abstract @Nullable Uri getUri()

When the source is open, returns the Uri from which data is being read. The returned Uri will be identical to the one passed open in the DataSpec unless redirection has occurred. If redirection has occurred, the Uri after redirection is returned.

Returns
`@Nullable Uri`	The `Uri` from which data is being read, or null if the source is not open.

open

@UnstableApi
abstract long open(DataSpec dataSpec)

Opens the source to read the specified data. If an IOException is thrown, callers must still call close to ensure that any partial effects of the invocation are cleaned up.

The following edge case behaviors apply:

If the requested position is within the resource, but the requested length extends beyond the end of the resource, then open will succeed and data from the requested position to the end of the resource will be made available through read.
If the requested position is equal to the length of the resource, then open will succeed, and read will immediately return RESULT_END_OF_INPUT.
If the requested position is greater than the length of the resource, then open will throw an IOException for which isCausedByPositionOutOfRange will be true.

Parameters
`DataSpec dataSpec`	Defines the data to be read.

Returns
`long`	The number of bytes that can be read from the opened source. For unbounded requests (i.e., requests where `length` equals `LENGTH_UNSET`) this value is the resolved length of the request, or `LENGTH_UNSET` if the length is still unresolved. For all other requests, the value returned will be equal to the request's `length`.

Throws
`java.io.IOException`	If an error occurs opening the source. `DataSourceException` can be thrown or used as a cause of the thrown exception to specify the reason of the error.

DataSource

Summary

Nested types

Public methods

Inherited methods

Public methods

addTransferListener

close

getResponseHeaders

getUri

open