DataSourceCallback

Kotlin |Java

abstract class DataSourceCallback : Closeable

kotlin.Any
↳	androidx.media2.common.DataSourceCallback

For supplying media data, implement this if your app has special requirements for the way media data is obtained.

Methods of this interface may be called on multiple different threads. There will be a thread synchronization point between each call to ensure that modifications to the state of your DataSourceCallback are visible to future calls. This means you don't need to do your own synchronization unless you're modifying the DataSourceCallback from another thread while it's being used by the media library.

Summary

Public constructors
`<init>()` For supplying media data, implement this if your app has special requirements for the way media data is obtained.

Public methods
abstract Long	`getSize()` Called to get the size of the data source.
abstract Int	`readAt(position: Long, @NonNull buffer: ByteArray, offset: Int, size: Int)` Called to request data from the given position.

Public constructors

<init>

DataSourceCallback()

For supplying media data, implement this if your app has special requirements for the way media data is obtained.

Public methods

getSize

abstract fun getSize(): Long

Called to get the size of the data source.

Return
`Long`	the size of data source in bytes, or -1 if the size is unknown.

Exceptions
`IOException`	on fatal errors

readAt

abstract fun readAt(
    position: Long, 
    @NonNull buffer: ByteArray, 
    offset: Int, 
    size: Int
): Int

Called to request data from the given position. Implementations should should write up to size bytes into buffer, and return the number of bytes written. Return 0 if size is zero (thus no bytes are read). Return -1 to indicate that end of stream is reached.

Parameters
`position`	Long: the position in the media item to read from.
`buffer`	ByteArray: the buffer to read the data into.
`offset`	Int: the offset within buffer to read the data into.
`size`	Int: the number of bytes to read.

Return
`Int`	the number of bytes read, or -1 if the end of stream was reached.

Exceptions
`IOException`	on fatal errors.