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/*
* Copyright 2002-2017 Drew Noakes
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.jpeg;
import com.drew.lang.annotations.NotNull;
import java.io.Serializable;
/**
* Stores information about a JPEG image component such as the component id, horiz/vert sampling factor and
* quantization table number.
*
* @author Drew Noakes https://drewnoakes.com
*/
public class JpegComponent implements Serializable
{
private static final long serialVersionUID = 61121257899091914L;
private final int _componentId;
private final int _samplingFactorByte;
private final int _quantizationTableNumber;
public JpegComponent(int componentId, int samplingFactorByte, int quantizationTableNumber)
{
_componentId = componentId;
_samplingFactorByte = samplingFactorByte;
_quantizationTableNumber = quantizationTableNumber;
}
public int getComponentId()
{
return _componentId;
}
/**
* Returns the component name (one of: Y, Cb, Cr, I, or Q)
* @return the component name
*/
@NotNull
public String getComponentName()
{
switch (_componentId)
{
case 1:
return "Y";
case 2:
return "Cb";
case 3:
return "Cr";
case 4:
return "I";
case 5:
return "Q";
default:
return String.format("Unknown (%s)", _componentId);
}
}
public int getQuantizationTableNumber()
{
return _quantizationTableNumber;
}
public int getHorizontalSamplingFactor()
{
return (_samplingFactorByte>>4) & 0x0F;
}
public int getVerticalSamplingFactor()
{
return _samplingFactorByte & 0x0F;
}
@NotNull
@Override
public String toString() {
return String.format(
"Quantization table %d, Sampling factors %d horiz/%d vert",
_quantizationTableNumber,
getHorizontalSamplingFactor(),
getVerticalSamplingFactor()
);
}
}
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