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.
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abstract
int
|
readAt(long position, byte[] buffer, int offset, int size)
Called to request data from the given position.
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Inherited methods |
From
class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
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boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
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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 .
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int
|
hashCode()
Returns a hash code value for the object.
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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.
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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.
|
|
From
interface
java.io.Closeable
abstract
void
|
close()
Closes this stream and releases any system resources associated
with it.
|
|
From
interface
java.lang.AutoCloseable
abstract
void
|
close()
Closes this resource, relinquishing any underlying resources.
|
|
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.
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