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Freedom for Media in Java
package com.sun.media;
import java.util.*;
import javax.media.*;
/**
* In progress.
*
* @author Ken Larson
* @deprecated Don't use this unless you really have to.
*
*/
@Deprecated
public abstract class BasicPlugIn implements PlugIn
{
// TODO: what is the "native" stuff all about?
// the native value seems to be a native pointer cast to a long.
// the data for the Buffer is still apparently a java object like byte[],
// Is it possible that getInputData(Buffer inBuffer) and inBuffer.getData
// return different values if it is a "native" buffer?
// the JFFMPEG code seems to imply this.
// Sun does appear to have a subclass of Buffer, ExtBuffer. ExtBuffer uses
// something
// called NBA, which appears to require a native library to instantiate.
// for now, this class will not support native buffers.
// see
// http://archives.java.sun.com/cgi-bin/wa?A2=ind0105&L=jmf-interest&D=1&F=P&S=&m=6503&P=26257
public static Class getClassForName(String className)
throws ClassNotFoundException
{
return Class.forName(className); // not sure why this method exists.
// Maybe there
// is a special classloader?
}
public static Format matches(Format in, Format[] outs)
{
for (int i = 0; i < outs.length; ++i)
{
if (in.matches(outs[i]))
return outs[i];
}
return null;
}
public static boolean plugInExists(String name, int type)
{
if (name == null)
throw new NullPointerException();
final Vector v = PlugInManager.getPlugInList(null, null, type);
for (int i = 0; i < v.size(); ++i)
{
final String s = (String) v.get(i);
if (name.equals(s))
return true;
}
return false;
}
protected Object[] controls = new Object[0];
public BasicPlugIn()
{
super();
}
public abstract void close();
protected void error()
{
throw new RuntimeException(getClass().getName() + " PlugIn error");
}
public Object getControl(String controlType)
{
final Class clazz;
try
{
clazz = Class.forName(controlType);
} catch (Exception e)
{
return null;
}
final Object[] controls = getControls(); // we cannot access
// this.controls directly,
// because subclass may have
// overridden getControls
for (int i = 0; i < controls.length; ++i)
{
final Object control = controls[i];
if (clazz.isInstance(control))
return control;
}
return null;
}
public Object[] getControls()
{
return controls;
}
protected Object getInputData(Buffer inBuffer)
{
return inBuffer.getData(); // TODO: does this do something special for
// native data?
}
public abstract String getName();
protected final long getNativeData(Object data)
{
return 0; // TODO
}
protected Object getOutputData(Buffer buffer)
{
return buffer.getData(); // TODO: does this do something special for
// native data?
}
public abstract void open() throws ResourceUnavailableException;
public abstract void reset();
protected byte[] validateByteArraySize(Buffer buffer, int newSize)
{
final Object data = buffer.getData();
// see if it is the right type, cast it if it is:
final byte[] dataCast;
if (data != null && data.getClass() == byte[].class)
dataCast = (byte[]) data;
else
dataCast = null;
if (dataCast != null && dataCast.length >= newSize)
{
// existing data is right type and long enough
return dataCast;
} else
{ // reallocate
final byte[] newData = new byte[newSize];
if (dataCast != null)
{ // copy existing data
System.arraycopy(dataCast, 0, newData, 0, dataCast.length);
}
buffer.setData(newData);
return newData;
}
}
protected Object validateData(Buffer buffer, int length, boolean allowNative)
{
// TODO: allowNative?
final Class dataType = buffer.getFormat().getDataType();
if (dataType == Format.byteArray)
return validateByteArraySize(buffer, length);
else if (dataType == Format.shortArray)
return validateShortArraySize(buffer, length);
else if (dataType == Format.intArray)
return validateIntArraySize(buffer, length);
else
return null;
}
protected int[] validateIntArraySize(Buffer buffer, int newSize)
{
final Object data = buffer.getData();
// see if it is the right type, cast it if it is:
final int[] dataCast;
if (data != null && data.getClass() == int[].class)
dataCast = (int[]) data;
else
dataCast = null;
if (dataCast != null && dataCast.length >= newSize)
{
// existing data is right type and long enough
return dataCast;
} else
{ // reallocate
final int[] newData = new int[newSize];
if (dataCast != null)
{ // copy existing data
System.arraycopy(dataCast, 0, newData, 0, dataCast.length);
}
buffer.setData(newData);
return newData;
}
}
protected short[] validateShortArraySize(Buffer buffer, int newSize)
{
final Object data = buffer.getData();
// see if it is the right type, cast it if it is:
final short[] dataCast;
if (data != null && data.getClass() == short[].class)
dataCast = (short[]) data;
else
dataCast = null;
if (dataCast != null && dataCast.length >= newSize)
{
// existing data is right type and long enough
return dataCast;
} else
{ // reallocate
final short[] newData = new short[newSize];
if (dataCast != null)
{ // copy existing data
System.arraycopy(dataCast, 0, newData, 0, dataCast.length);
}
buffer.setData(newData);
return newData;
}
}
}