package org.jaudiotagger.audio.flac.metadatablock;
import org.jaudiotagger.audio.generic.Utils;
import org.jaudiotagger.tag.FieldKey;
import org.jaudiotagger.tag.InvalidFrameException;
import org.jaudiotagger.tag.TagField;
import org.jaudiotagger.tag.id3.valuepair.TextEncoding;
import org.jaudiotagger.tag.reference.PictureTypes;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.logging.Logger;
/**
* Picture Block
* <p/>
* <p/>
* <p>This block is for storing pictures associated with the file, most commonly cover art from CDs.
* There may be more than one PICTURE block in a file. The picture format is similar to the APIC frame in ID3v2.
* The PICTURE block has a type, MIME type, and UTF-8 description like ID3v2, and supports external linking via URL
* (though this is discouraged). The differences are that there is no uniqueness constraint on the description field,
* and the MIME type is mandatory. The FLAC PICTURE block also includes the resolution, color depth, and palette size
* so that the client can search for a suitable picture without having to scan them all
* <p/>
* Format:
* <Size in bits> Info
* <32> The picture type according to the ID3v2 APIC frame: (There may only be one each of picture type 1 and 2 in a file)
* <32> The length of the MIME type string in bytes.
* <n*8> The MIME type string, in printable ASCII characters 0x20-0x7e. The MIME type may also be --> to signify that the data part is a URL of the picture instead of the picture data itself.
* <32> The length of the description string in bytes.
* <n*8> The description of the picture, in UTF-8.
* <32> The width of the picture in pixels.
* <32> The height of the picture in pixels.
* <32> The color depth of the picture in bits-per-pixel.
* <32> For indexed-color pictures (e.g. GIF), the number of colors used, or 0 for non-indexed pictures.
* <32> The length of the picture data in bytes.
* <n*8> The binary picture data.
*/
public class MetadataBlockDataPicture implements MetadataBlockData, TagField
{
public static final String IMAGE_IS_URL = "-->";
private int pictureType;
private String mimeType;
private String description;
private int width;
private int height;
private int colourDepth;
private int indexedColouredCount;
private byte[] imageData;
// Logger Object
public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.flac.MetadataBlockDataPicture");
private void initFromByteBuffer(ByteBuffer rawdata) throws IOException, InvalidFrameException
{
//Picture Type
pictureType = rawdata.getInt();
if (pictureType >= PictureTypes.getInstanceOf().getSize())
{
throw new InvalidFrameException("PictureType was:" + pictureType + "but the maximum allowed is " + (PictureTypes.getInstanceOf().getSize() - 1));
}
//MimeType
int mimeTypeSize = rawdata.getInt();
mimeType = getString(rawdata, mimeTypeSize, "ISO-8859-1");
//Description
int descriptionSize = rawdata.getInt();
description = getString(rawdata, descriptionSize, "UTF-8");
//Image width
width = rawdata.getInt();
//Image height
height = rawdata.getInt();
//Colour Depth
colourDepth = rawdata.getInt();
//Indexed Colour Count
indexedColouredCount = rawdata.getInt();
//ImageData
int rawdataSize = rawdata.getInt();
imageData = new byte[rawdataSize];
rawdata.get(imageData);
logger.config("Read image:" + this.toString());
}
/**
* Initialize MetaBlockDataPicture from byteBuffer
*
* @param rawdata
* @throws IOException
* @throws InvalidFrameException
*/
public MetadataBlockDataPicture(ByteBuffer rawdata) throws IOException, InvalidFrameException
{
initFromByteBuffer(rawdata);
}
/**
* Construct picture block by reading from file, the header informs us how many bytes we should be reading from
*
* @param header
* @param raf
* @throws java.io.IOException
* @throws org.jaudiotagger.tag.InvalidFrameException
*/
//TODO check for buffer underflows see http://research.eeye.com/html/advisories/published/AD20071115.html
public MetadataBlockDataPicture(MetadataBlockHeader header, RandomAccessFile raf) throws IOException, InvalidFrameException
{
ByteBuffer rawdata = ByteBuffer.allocate(header.getDataLength());
int bytesRead = raf.getChannel().read(rawdata);
if (bytesRead < header.getDataLength())
{
throw new IOException("Unable to read required number of databytes read:" + bytesRead + ":required:" + header.getDataLength());
}
rawdata.rewind();
initFromByteBuffer(rawdata);
}
/**
* Construct new MetadataPicture block
* @param imageData
* @param pictureType
* @param mimeType
* @param description
* @param width
* @param height
* @param colourDepth
* @param indexedColouredCount
*/
public MetadataBlockDataPicture(byte[] imageData, int pictureType, String mimeType, String description, int width, int height, int colourDepth, int indexedColouredCount)
{
//Picture Type
this.pictureType = pictureType;
//MimeType
this.mimeType = mimeType;
//Description
this.description = description;
this.width = width;
this.height = height;
this.colourDepth = colourDepth;
this.indexedColouredCount = indexedColouredCount;
//ImageData
this.imageData = imageData;
}
private String getString(ByteBuffer rawdata, int length, String charset) throws IOException
{
byte[] tempbuffer = new byte[length];
rawdata.get(tempbuffer);
return new String(tempbuffer, charset);
}
public byte[] getBytes()
{
try
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos.write(Utils.getSizeBEInt32(pictureType));
baos.write(Utils.getSizeBEInt32(mimeType.length()));
baos.write(mimeType.getBytes("ISO-8859-1"));
baos.write(Utils.getSizeBEInt32(description.length()));
baos.write(description.getBytes("UTF-8"));
baos.write(Utils.getSizeBEInt32(width));
baos.write(Utils.getSizeBEInt32(height));
baos.write(Utils.getSizeBEInt32(colourDepth));
baos.write(Utils.getSizeBEInt32(indexedColouredCount));
baos.write(Utils.getSizeBEInt32(imageData.length));
baos.write(imageData);
return baos.toByteArray();
}
catch (IOException ioe)
{
throw new RuntimeException(ioe.getMessage());
}
}
public int getLength()
{
return getBytes().length;
}
public int getPictureType()
{
return pictureType;
}
public String getMimeType()
{
return mimeType;
}
public String getDescription()
{
return description;
}
public int getWidth()
{
return width;
}
public int getHeight()
{
return height;
}
public int getColourDepth()
{
return colourDepth;
}
public int getIndexedColourCount()
{
return indexedColouredCount;
}
public byte[] getImageData()
{
return imageData;
}
/**
* @return true if imagedata is held as a url rather than actually being imagedata
*/
public boolean isImageUrl()
{
return getMimeType().equals(IMAGE_IS_URL);
}
/**
* @return the image url if there is otherwise return an empty String
*/
public String getImageUrl()
{
if (isImageUrl())
{
return Utils.getString(getImageData(), 0, getImageData().length, TextEncoding.CHARSET_ISO_8859_1);
}
else
{
return "";
}
}
public String toString()
{
return PictureTypes.getInstanceOf().getValueForId(pictureType) + ":" + mimeType + ":" + description + ":" + "width:" + width + ":height:" + height + ":colourdepth:" + colourDepth + ":indexedColourCount:" + indexedColouredCount + ":image size in bytes:" + imageData.length;
}
/**
* This method copies the data of the given field to the current data.<br>
*
* @param field The field containing the data to be taken.
*/
public void copyContent(TagField field)
{
throw new UnsupportedOperationException();
}
/**
* Returns the Id of the represented tag field.<br>
* This value should uniquely identify a kind of tag data, like title.
* {@link org.jaudiotagger.audio.generic.AbstractTag} will use the "id" to summarize multiple
* fields.
*
* @return Unique identifier for the fields type. (title, artist...)
*/
public String getId()
{
return FieldKey.COVER_ART.name();
}
/**
* This method delivers the binary representation of the fields data in
* order to be directly written to the file.<br>
*
* @return Binary data representing the current tag field.<br>
* @throws java.io.UnsupportedEncodingException
* Most tag data represents text. In some cases the underlying
* implementation will need to convert the text data in java to
* a specific charset encoding. In these cases an
* {@link java.io.UnsupportedEncodingException} may occur.
*/
public byte[] getRawContent() throws UnsupportedEncodingException
{
return getBytes();
}
/**
* Determines whether the represented field contains (is made up of) binary
* data, instead of text data.<br>
* Software can identify fields to be displayed because they are human
* readable if this method returns <code>false</code>.
*
* @return <code>true</code> if field represents binary data (not human
* readable).
*/
public boolean isBinary()
{
return true;
}
/**
* This method will set the field to represent binary data.<br>
* <p/>
* Some implementations may support conversions.<br>
* As of now (Octobre 2005) there is no implementation really using this
* method to perform useful operations.
*
* @param b <code>true</code>, if the field contains binary data.
* @deprecated As for now is of no use. Implementations should use another
* way of setting this property.
*/
public void isBinary(boolean b)
{
//Do nothing, always true
}
/**
* Identifies a field to be of common use.<br>
* <p/>
* Some software may differ between common and not common fields. A common
* one is for sure the title field. A web link may not be of common use for
* tagging. However some file formats, or future development of users
* expectations will make more fields common than now can be known.
*
* @return <code>true</code> if the field is of common use.
*/
public boolean isCommon()
{
return true;
}
/**
* Determines whether the content of the field is empty.<br>
*
* @return <code>true</code> if no data is stored (or empty String).
*/
public boolean isEmpty()
{
return false;
}
}
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