audiocodec.java

来自「FMJ（freedom media for java)是java视频开发的新选择」· Java 代码 · 共 116 行

package com.ibm.media.codec.audio;

import java.util.ArrayList;
import java.util.List;

import javax.media.Format;
import javax.media.format.AudioFormat;

import com.sun.media.BasicCodec;

/**
 * 
 * @author Ken Larson
 *
 */
public abstract class AudioCodec extends BasicCodec
{

	protected String PLUGIN_NAME;
	
	protected AudioFormat[] defaultOutputFormats;
	protected AudioFormat[] supportedInputFormats;
	protected AudioFormat[] supportedOutputFormats;
	protected AudioFormat inputFormat;
	protected AudioFormat outputFormat;
	protected final boolean DEBUG = true;
	
	public AudioCodec()
	{	super();
	}
	public String getName()
	{	return PLUGIN_NAME; 
	}
	public Format[] getSupportedInputFormats()
	{	return supportedInputFormats; 
	}
	public Format setInputFormat(Format format)
	{	
		if (!(format instanceof AudioFormat))
			return null;
		for (int i = 0; i < supportedInputFormats.length; ++i)
		{	if (format.matches(supportedInputFormats[i]))
			{	inputFormat = (AudioFormat) format;
				return inputFormat;	
			}
		}
		return null; 
	}
	public Format setOutputFormat(Format format)
	{	
		if (!(format instanceof AudioFormat))
			return null;

		final Format[] formats = getMatchingOutputFormats(inputFormat);
		
		for (int i = 0; i < formats.length; ++i)
		{	if (format.matches(formats[i]))
			{	outputFormat = (AudioFormat) format;
				return outputFormat;	
			}
		}
		return null; 
	}
	protected Format getInputFormat()
	{	return inputFormat; 
	}
	protected Format getOutputFormat()
	{	return outputFormat; 
	}
	protected Format[] getMatchingOutputFormats(Format in)
	{	
		return new Format[0]; // this seems to be always overridden by subclasses
	}
	public Format[] getSupportedOutputFormats(Format in)
	{	
		if (in == null)
			return defaultOutputFormats;
		
		// TODO: test this code.
		final List result = new ArrayList();
		
		if (in == null) 
		{	for (int i = 0; i < supportedInputFormats.length; ++i)
			{	inputFormat = supportedInputFormats[i];
					
				Format[] matching = getMatchingOutputFormats(inputFormat); 
				for (int j = 0; j < matching.length; ++j) {
					result.add(matching[j]);
				}
			}
		}
		else 
		{	for (int i = 0; i < supportedInputFormats.length; ++i)
			{	if (in.matches(supportedInputFormats[i]))
				{	inputFormat = (AudioFormat) in;
					
					Format[] matching = getMatchingOutputFormats(in); 
					for (int j = 0; j < matching.length; ++j) {
						result.add(matching[j]);	// TODO: since we are calling getMatchingOutputFormats with in, not supportedInputFormats[i], we can take this out of the loop.
					}
				}
			}
		}
		
		final Format[] arrayResult = new Format[result.size()];
		for (int i = 0; i < result.size(); ++i)
		{	arrayResult[i] = (Format) result.get(i);
		}
		
		return arrayResult;
	}
	public boolean checkFormat(Format format)
	{	return true; // TODO
	}
}