Mp4AlacBox.java

package org.jaudiotagger.audio.mp4.atom;

import org.jaudiotagger.audio.generic.Utils;
import org.jaudiotagger.audio.exceptions.CannotReadException;

import java.nio.ByteBuffer;

/**
 * AlacBox ( Apple Lossless Codec information description box),
 * <p/>
 * Normally occurs twice, the first ALAC contaisn the default  values, the second ALAC within contains the real
 * values for this audio.
 */
public class Mp4AlacBox extends AbstractMp4Box {
    public static final int OTHER_FLAG_LENGTH = 4;

    private int maxSamplePerFrame; // 32bit
    private int unknown1; // 8bit
    private int sampleSize; // 8bit
    private int historyMult; // 8bit
    private int initialHistory; // 8bit
    private int kModifier; // 8bit
    private int channels; // 8bit
    private int unknown2; // 16bit
    private int maxCodedFrameSize; // 32bit
    private int bitRate; // 32bit
    private int sampleRate; // 32bit


    /**
     * DataBuffer must start from from the start of the body
     *
     * @param header     header info
     * @param dataBuffer data of box (doesnt include header data)
     */
    public Mp4AlacBox(Mp4BoxHeader header, ByteBuffer dataBuffer) {
        this.header = header;
        this.dataBuffer = dataBuffer;
    }

    public void processData() throws CannotReadException {
        //Skip version/other flags
        dataBuffer.position(dataBuffer.position() + OTHER_FLAG_LENGTH);

        maxSamplePerFrame = Utils.readUBEInt32(dataBuffer);
        unknown1 = Utils.readUInt8(dataBuffer);
        sampleSize = Utils.readUInt8(dataBuffer);
        historyMult = Utils.readUInt8(dataBuffer);
        initialHistory = Utils.readUInt8(dataBuffer);
        kModifier = Utils.readUInt8(dataBuffer);
        channels = Utils.readUInt8(dataBuffer);
        unknown2 = Utils.readUBEInt16(dataBuffer);
        maxCodedFrameSize = Utils.readUBEInt32(dataBuffer);
        bitRate = Utils.readUBEInt32(dataBuffer);
        sampleRate = Utils.readUBEInt32(dataBuffer);
    }

    public int getMaxSamplePerFrame() {
        return maxSamplePerFrame;
    }

    public int getUnknown1() {
        return unknown1;
    }

    public int getSampleSize() {
        return sampleSize;
    }

    public int getHistoryMult() {
        return historyMult;
    }

    public int getInitialHistory() {
        return initialHistory;
    }

    public int getKModifier() {
        return kModifier;
    }

    public int getChannels() {
        return channels;
    }

    public int getUnknown2() {
        return unknown2;
    }

    public int getMaxCodedFrameSize() {
        return maxCodedFrameSize;
    }

    public int getBitRate() {
        return bitRate;
    }

    public int getSampleRate() {
        return sampleRate;
    }

    public String toString() {
        String s = "maxSamplePerFrame:" + maxSamplePerFrame
                + "unknown1:" + unknown1
                + "sampleSize:" + sampleSize
                + "historyMult:" + historyMult
                + "initialHistory:" + initialHistory
                + "kModifier:" + kModifier
                + "channels:" + channels
                + "unknown2 :" + unknown2
                + "maxCodedFrameSize:" + maxCodedFrameSize
                + "bitRate:" + bitRate
                + "sampleRate:" + sampleRate;
        return s;
    }
}