/*
* Entagged Audio Tag library
* Copyright (c) 2004-2005 Christian Laireiter <liree@web.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jaudiotagger.audio.asf.io;
import org.jaudiotagger.audio.asf.data.Chunk;
import org.jaudiotagger.audio.asf.data.GUID;
import org.jaudiotagger.audio.asf.data.StreamBitratePropertiesChunk;
import org.jaudiotagger.audio.asf.util.Utils;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
/**
* This class reads the chunk containing the stream bitrate properties.<br>
*
* @author Christian Laireiter
*/
public class StreamBitratePropertiesReader implements ChunkReader {
/**
* The GUID this reader {@linkplain #getApplyingIds() applies to}
*/
private final static GUID[] APPLYING = { GUID.GUID_STREAM_BITRATE_PROPERTIES };
/**
* Should not be used for now.
*/
protected StreamBitratePropertiesReader() {
// NOTHING toDo
}
/**
* {@inheritDoc}
*/
public boolean canFail() {
return false;
}
/**
* {@inheritDoc}
*/
public GUID[] getApplyingIds() {
return APPLYING.clone();
}
/**
* {@inheritDoc}
*/
public Chunk read(final GUID guid, final InputStream stream,
final long chunkStart) throws IOException {
final BigInteger chunkLen = Utils.readBig64(stream);
final StreamBitratePropertiesChunk result = new StreamBitratePropertiesChunk(
chunkLen);
/*
* Read the amount of bitrate records
*/
final long recordCount = Utils.readUINT16(stream);
for (int i = 0; i < recordCount; i++) {
final int flags = Utils.readUINT16(stream);
final long avgBitrate = Utils.readUINT32(stream);
result.addBitrateRecord(flags & 0x00FF, avgBitrate);
}
result.setPosition(chunkStart);
return result;
}
} |