/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * 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.  
 */

package com.coremedia.iso.boxes;


import com.coremedia.iso. BoxParser;
import com.coremedia.iso. IsoBufferWrapper;
import com.coremedia.iso. IsoFile;
import com.coremedia.iso. IsoOutputStream;

import java.io. IOException;

/**
 * This box containes the sample count and a table giving the size in bytes of each sample. 
 * Defined in ISO/IEC 14496-12. 
 */
public class SampleSizeBox extends AbstractFullBox {
    private long sampleSize;
    private long[] sampleSizes;
    public static final String TYPE = "stsz";
    long sampleCount;

    public SampleSizeBox() {
        super(IsoFile.fourCCtoBytes(TYPE));
    }

    /**
     * Returns the field sample size. 
     * If sampleSize > 0 every sample has the same size. 
     * If sampleSize == 0 the samples have different size as stated in the sampleSizes field. 
     *
     * @return the sampleSize field
     */
    public long getSampleSize() {
        return sampleSize;
    }

    public void setSampleSize(long sampleSize) {
        this.sampleSize = sampleSize;
    }


    public long getSampleSizeAtIndex(int index) {
        if (sampleSize > 0) {
            return sampleSize;
        } else {
            return sampleSizes[index];
        }
    }

    public long getSampleCount() {
        if (sampleSize > 0) {
            return sampleCount;
        } else {
            return sampleSizes.length;
        }

    }

    public long[] getSampleSizes() {
        return sampleSizes;
    }

    public void setSampleSizes(long[] sampleSizes) {
        this.sampleSizes = sampleSizes;
    }

    protected long getContentSize() {
        return 8 + (sampleSize == 0 ?  sampleSizes.length * 4 : 0);
    }

    public void parse(IsoBufferWrapper in, long size, BoxParser boxParser, Box lastMovieFragmentBox) throws IOException {

        assert ((int) size) == size;

        super.parse(in, size, boxParser, lastMovieFragmentBox);
        sampleSize = in.readUInt32();
        sampleCount = in.readUInt32();
        if (sampleCount > Integer. MAX_VALUE) {
            throw new IOException("The parser cannot deal with more than Integer. MAX_VALUE samples!"); 
        }

        if (sampleSize == 0) {
            sampleSizes = new long[(int) sampleCount];

            for (int i = 0; i < sampleCount; i++) {
                sampleSizes[i] = in.readUInt32();
            }
        }
    }

    protected void getContent(IsoOutputStream isos) throws IOException {
        isos.writeUInt32(sampleSize);

        if (sampleSize == 0) {
            isos.writeUInt32(sampleSizes.length);
            for (long sampleSize1 : sampleSizes) {
                isos.writeUInt32(sampleSize1);
            }
        } else {
            isos.writeUInt32(sampleCount);
        }

    }

    public String toString() {
        return "SampleSizeBox[sampleSize=" + getSampleSize() + ";sampleCount=" + getSampleCount() + "]";
    }
}
