DataSourceCallback
abstract class DataSourceCallback : Closeable
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 |
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Public functions |
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abstract Long |
getSize()Called to get the size of the data source. |
abstract Int |
Called to request data from the given position. |
Public constructors
Public functions
abstract fun getSize(): Long
Called to get the size of the data source.
| Returns | |
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Long |
the size of data source in bytes, or -1 if the size is unknown. |
| Throws | |
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java.io.IOException |
on fatal errors |
abstract fun readAt(position: Long, 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. |
| Returns | |
|---|---|
Int |
the number of bytes read, or -1 if the end of stream was reached. |
| Throws | |
|---|---|
java.io.IOException |
on fatal errors. |