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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.imaging.jpeg.JpegProcessingException;
import com.drew.imaging.jpeg.JpegSegmentType;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Metadata;
import com.drew.tools.FileUtil;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
/**
* @author Drew Noakes https://drewnoakes.com
*/
public class JpegReaderTest
{
@NotNull
public static JpegDirectory processBytes(String filePath) throws IOException
{
Metadata metadata = new Metadata();
new JpegReader().extract(FileUtil.readBytes(filePath), metadata, JpegSegmentType.SOF0);
JpegDirectory directory = metadata.getFirstDirectoryOfType(JpegDirectory.class);
assertNotNull(directory);
return directory;
}
private JpegDirectory _directory;
@Before
public void setUp() throws JpegProcessingException, IOException
{
_directory = processBytes("Tests/Data/simple.jpg.sof0");
}
@Test
public void testExtract_Width() throws Exception
{
assertEquals(800, _directory.getInt(JpegDirectory.TAG_IMAGE_WIDTH));
}
@Test
public void testExtract_Height() throws Exception
{
assertEquals(600, _directory.getInt(JpegDirectory.TAG_IMAGE_HEIGHT));
}
@Test
public void testExtract_DataPrecision() throws Exception
{
assertEquals(8, _directory.getInt(JpegDirectory.TAG_DATA_PRECISION));
}
@Test
public void testExtract_NumberOfComponents() throws Exception
{
assertEquals(3, _directory.getInt(JpegDirectory.TAG_NUMBER_OF_COMPONENTS));
}
@Test
public void testComponentData1() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_COMPONENT_DATA_1);
assertNotNull(component);
assertEquals("Y", component.getComponentName());
assertEquals(1, component.getComponentId());
assertEquals(0, component.getQuantizationTableNumber());
assertEquals(2, component.getHorizontalSamplingFactor());
assertEquals(2, component.getVerticalSamplingFactor());
}
@Test
public void testComponentData2() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_COMPONENT_DATA_2);
assertNotNull(component);
assertEquals("Cb", component.getComponentName());
assertEquals(2, component.getComponentId());
assertEquals(1, component.getQuantizationTableNumber());
assertEquals(1, component.getHorizontalSamplingFactor());
assertEquals(1, component.getVerticalSamplingFactor());
assertEquals("Cb component: Quantization table 1, Sampling factors 1 horiz/1 vert", _directory.getDescription(JpegDirectory.TAG_COMPONENT_DATA_2));
}
@Test
public void testComponentData3() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_COMPONENT_DATA_3);
assertNotNull(component);
assertEquals("Cr", component.getComponentName());
assertEquals(3, component.getComponentId());
assertEquals(1, component.getQuantizationTableNumber());
assertEquals(1, component.getHorizontalSamplingFactor());
assertEquals(1, component.getVerticalSamplingFactor());
assertEquals("Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert", _directory.getDescription(JpegDirectory.TAG_COMPONENT_DATA_3));
}
/*
// this test is part of an incomplete investigation into extracting audio from JPG files
public void testJpegWithAudio() throws Exception
{
// use a known testing image
File jpegFile = new File("Tests/com/drew/metadata/jpeg/audioPresent.jpg");
JpegSegmentReader jpegSegmentReader = new JpegSegmentReader(jpegFile);
byte[] segment1Bytes = jpegSegmentReader.readSegment(JpegSegmentReader.APP2);
System.out.println(segment1Bytes.length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP1));
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP2).length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP3));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP4));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP5));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP6));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP7));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP8));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APP9));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPA));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPB));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPC));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPD));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPE));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.APPF));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.COM));
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.DHT).length);
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.DQT).length);
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SOF0).length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SOI));
// write the segment's data out to a wav file...
File audioFile = new File("Tests/com/drew/metadata/jpeg/audio.wav");
FileOutputStream os = null;
try
{
os = new FileOutputStream(audioFile);
os.write(segment1Bytes);
}
finally
{
if (os!=null)
os.close();
}
}
*/
}
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