MediaDataSource
public abstract class MediaDataSource
extends Object
implements Closeable
For supplying media data to the framework. 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 MediaDataSource are visible to future calls. This means you don't need to do your own synchronization unless you're modifying the MediaDataSource from another thread while it's being used by the framework.
Summary
Public methods |
abstract long |
getSize() Called to get the size of the data source. |
abstract int |
readAt(long position, byte[] buffer, int offset, int size) Called to request data from the given position. |
Inherited methods |
From class java.lang.Object
Object |
clone() Creates and returns a copy of this object. |
boolean |
equals(Object obj) Indicates whether some other object is "equal to" this one. |
void |
finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. |
final Class<?> |
getClass() Returns the runtime class of this Object . |
int |
hashCode() Returns a hash code value for the object. |
final void |
notify() Wakes up a single thread that is waiting on this object's monitor. |
final void |
notifyAll() Wakes up all threads that are waiting on this object's monitor. |
String |
toString() Returns a string representation of the object. |
final void |
wait(long millis, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. |
final void |
wait(long millis) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed. |
final void |
wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. |
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From interface java.io.Closeable
abstract void |
close() Closes this stream and releases any system resources associated with it. |
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From interface java.lang.AutoCloseable
abstract void |
close() Closes this resource, relinquishing any underlying resources. |
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Public constructors
MediaDataSource
MediaDataSource ()
Public methods
getSize
long getSize ()
Called to get the size of the data source.
Returns |
long |
the size of data source in bytes, or -1 if the size is unknown. |
readAt
int readAt (long position,
byte[] buffer,
int offset,
int size)
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 data source to read from. |
buffer |
byte : 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 there was an error. |