/*
* Copyright 2002-2012 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:
*
* http://drewnoakes.com/code/exif/
* http://code.google.com/p/metadata-extractor/
*/
package com.drew.metadata.jpeg;
import com.drew.imaging.jpeg.JpegProcessingException;
import com.drew.imaging.jpeg.JpegSegmentReader;
import com.drew.lang.ByteArrayReader;
import com.drew.metadata.Metadata;
import com.drew.metadata.MetadataReader;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
/**
* @author Drew Noakes http://drewnoakes.com
*/
public class JpegReaderTest
{
private JpegDirectory _directory;
@Before
public void setUp() throws JpegProcessingException, IOException
{
// use a known testing image
File jpegFile = new File("Tests/com/drew/metadata/jpeg/simple.jpg");
final byte[] data = new JpegSegmentReader(jpegFile).readSegment(JpegSegmentReader.SEGMENT_SOF0);
MetadataReader reader = new JpegReader();
Metadata metadata = new Metadata();
Assert.assertNotNull(data);
reader.extract(new ByteArrayReader(data), metadata);
Assert.assertTrue(metadata.containsDirectory(JpegDirectory.class));
_directory = metadata.getOrCreateDirectory(JpegDirectory.class);
}
@Test
public void testExtract_Width() throws Exception
{
Assert.assertEquals(800, _directory.getInt(JpegDirectory.TAG_JPEG_IMAGE_WIDTH));
}
@Test
public void testExtract_Height() throws Exception
{
Assert.assertEquals(600, _directory.getInt(JpegDirectory.TAG_JPEG_IMAGE_HEIGHT));
}
@Test
public void testExtract_DataPrecision() throws Exception
{
Assert.assertEquals(8, _directory.getInt(JpegDirectory.TAG_JPEG_DATA_PRECISION));
}
@Test
public void testExtract_NumberOfComponents() throws Exception
{
Assert.assertEquals(3, _directory.getInt(JpegDirectory.TAG_JPEG_NUMBER_OF_COMPONENTS));
}
@Test
public void testComponentData1() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_JPEG_COMPONENT_DATA_1);
Assert.assertNotNull(component);
Assert.assertEquals("Y", component.getComponentName());
Assert.assertEquals(1, component.getComponentId());
Assert.assertEquals(0, component.getQuantizationTableNumber());
Assert.assertEquals(2, component.getHorizontalSamplingFactor());
Assert.assertEquals(2, component.getVerticalSamplingFactor());
}
@Test
public void testComponentData2() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_JPEG_COMPONENT_DATA_2);
Assert.assertNotNull(component);
Assert.assertEquals("Cb", component.getComponentName());
Assert.assertEquals(2, component.getComponentId());
Assert.assertEquals(1, component.getQuantizationTableNumber());
Assert.assertEquals(1, component.getHorizontalSamplingFactor());
Assert.assertEquals(1, component.getVerticalSamplingFactor());
Assert.assertEquals("Cb component: Quantization table 1, Sampling factors 1 horiz/1 vert", _directory.getDescription(JpegDirectory.TAG_JPEG_COMPONENT_DATA_2));
}
@Test
public void testComponentData3() throws Exception
{
JpegComponent component = (JpegComponent)_directory.getObject(JpegDirectory.TAG_JPEG_COMPONENT_DATA_3);
Assert.assertNotNull(component);
Assert.assertEquals("Cr", component.getComponentName());
Assert.assertEquals(3, component.getComponentId());
Assert.assertEquals(1, component.getQuantizationTableNumber());
Assert.assertEquals(1, component.getHorizontalSamplingFactor());
Assert.assertEquals(1, component.getVerticalSamplingFactor());
Assert.assertEquals("Cr component: Quantization table 1, Sampling factors 1 horiz/1 vert", _directory.getDescription(JpegDirectory.TAG_JPEG_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.SEGMENT_APP2);
System.out.println(segment1Bytes.length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1));
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP2).length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP3));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP4));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP5));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP6));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP7));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP8));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APP9));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPA));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPB));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPC));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPD));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPE));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_APPF));
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_COM));
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_DHT).length);
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_DQT).length);
System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_SOF0).length);
// System.out.println(jpegSegmentReader.readSegment(JpegSegmentReader.SEGMENT_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();
}
}
*/
}