DefaultDataSource

Artifact: androidx.media3:media3-datasource

Kotlin |Java

public final class DefaultDataSource implements DataSource

A DataSource that supports multiple URI schemes. The supported schemes are:

file: For fetching data from a local file (e.g. file:///path/to/media/media.mp4, or just /path/to/media/media.mp4 because the implementation assumes that a URI without a scheme is a local file URI).
asset: For fetching data from an asset in the application's APK (e.g. asset:///media.mp4).
rawresource: For fetching data from a raw resource in the application's APK (e.g. rawresource:///resourceId, where rawResourceId is the integer identifier of the raw resource).
android.resource: For fetching data in the application's APK (e.g. android.resource:///resourceId or android.resource://resourceType/resourceName). See RawResourceDataSource for more information about the URI form.
content: For fetching data from a content URI (e.g. content://authority/path/123).
rtmp: For fetching data over RTMP. Only supported if the project using ExoPlayer has an explicit dependency on ExoPlayer's RTMP extension.
data: For parsing data inlined in the URI as defined in RFC 2397.
udp: For fetching data over UDP (e.g. udp://something.com/media).
http(s): For fetching data over HTTP and HTTPS (e.g. https://www.something.com/media.mp4), if constructed using DefaultDataSource, or any other schemes supported by a base data source if constructed using DefaultDataSource.

Summary

Nested types
`public final class DefaultDataSource.Factory implements DataSource.Factory` `DataSource.Factory` for `DefaultDataSource` instances.

Public constructors
`@UnstableApi DefaultDataSource(Context context, boolean allowCrossProtocolRedirects)` Constructs a new instance, optionally configured to follow cross-protocol redirects.
`@UnstableApi DefaultDataSource(Context context, DataSource baseDataSource)` Constructs a new instance that delegates to a provided `DataSource` for URI schemes other than file, asset and content.
`@UnstableApi DefaultDataSource( Context context, @Nullable String userAgent, boolean allowCrossProtocolRedirects )` Constructs a new instance, optionally configured to follow cross-protocol redirects.
`@UnstableApi DefaultDataSource( Context context, @Nullable String userAgent, int connectTimeoutMillis, int readTimeoutMillis, boolean allowCrossProtocolRedirects )` Constructs a new instance, optionally configured to follow cross-protocol redirects.

Public methods
`void`	`@UnstableApi addTransferListener(TransferListener transferListener)` Adds a `TransferListener` to listen to data transfers.
`void`	`@UnstableApi close()` Closes the source.
`Map<String, List<String>>`	`@UnstableApi getResponseHeaders()` When the source is open, returns the response headers associated with the last `open` call.
`@Nullable Uri`	`@UnstableApi getUri()` When the source is open, returns the `Uri` from which data is being read.
`long`	`@UnstableApi open(DataSpec dataSpec)` Opens the source to read the specified data.
`int`	`@UnstableApi read(byte[] buffer, int offset, int length)` Reads up to `length` bytes of data from the input.

Public constructors

DefaultDataSource

@UnstableApi
public DefaultDataSource(Context context, boolean allowCrossProtocolRedirects)

Constructs a new instance, optionally configured to follow cross-protocol redirects.

Parameters
`Context context`	A context.
`boolean allowCrossProtocolRedirects`	Whether to allow cross-protocol redirects.

DefaultDataSource

@UnstableApi
public DefaultDataSource(Context context, DataSource baseDataSource)

Constructs a new instance that delegates to a provided DataSource for URI schemes other than file, asset and content.

Parameters
`Context context`	A context.
`DataSource baseDataSource`	A `DataSource` to use for URI schemes other than file, asset and content. This `DataSource` should normally support at least http(s).

DefaultDataSource

@UnstableApi
public DefaultDataSource(
    Context context,
    @Nullable String userAgent,
    boolean allowCrossProtocolRedirects
)

Constructs a new instance, optionally configured to follow cross-protocol redirects.

Parameters
`Context context`	A context.
`@Nullable String userAgent`	The user agent that will be used when requesting remote data, or `null` to use the default user agent of the underlying platform.
`boolean allowCrossProtocolRedirects`	Whether cross-protocol redirects (i.e. redirects from HTTP to HTTPS and vice versa) are enabled when fetching remote data.

DefaultDataSource

@UnstableApi
public DefaultDataSource(
    Context context,
    @Nullable String userAgent,
    int connectTimeoutMillis,
    int readTimeoutMillis,
    boolean allowCrossProtocolRedirects
)

Constructs a new instance, optionally configured to follow cross-protocol redirects.

Parameters
`Context context`	A context.
`@Nullable String userAgent`	The user agent that will be used when requesting remote data, or `null` to use the default user agent of the underlying platform.
`int connectTimeoutMillis`	The connection timeout that should be used when requesting remote data, in milliseconds. A timeout of zero is interpreted as an infinite timeout.
`int readTimeoutMillis`	The read timeout that should be used when requesting remote data, in milliseconds. A timeout of zero is interpreted as an infinite timeout.
`boolean allowCrossProtocolRedirects`	Whether cross-protocol redirects (i.e. redirects from HTTP to HTTPS and vice versa) are enabled when fetching remote data.

Public methods

addTransferListener

@UnstableApi
public 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
public 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
public 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
public @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
public 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.

read

@UnstableApi
public int read(byte[] buffer, int offset, int length)

Reads up to length bytes of data from the input.

If readLength is zero then 0 is returned. Otherwise, if no data is available because the end of the opened range has been reached, then RESULT_END_OF_INPUT is returned. Otherwise, the call will block until at least one byte of data has been read and the number of bytes read is returned.

Parameters
`byte[] buffer`	A target array into which data should be written.
`int offset`	The offset into the target array at which to write.
`int length`	The maximum number of bytes to read from the input.

Returns
`int`	The number of bytes read, or `RESULT_END_OF_INPUT` if the input has ended. This may be less than `length` because the end of the input (or available data) was reached, the method was interrupted, or the operation was aborted early for another reason.

Throws
`java.io.IOException`	If an error occurs reading from the input.

DefaultDataSource

Summary

Nested types

Public constructors

Public methods

Public constructors

DefaultDataSource

DefaultDataSource

DefaultDataSource

DefaultDataSource

Public methods

addTransferListener

close

getResponseHeaders

getUri

open

read