com.github.xingshuangs.iot.protocol.mp4.model.Mp4VmhdBox Maven / Gradle / Ivy

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/*
 * MIT License
 *
 * Copyright (c) 2021-2099 Oscura (xingshuang) 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.xingshuangs.iot.protocol.mp4.model;


import com.github.xingshuangs.iot.common.buff.ByteWriteBuff;
import com.github.xingshuangs.iot.protocol.mp4.enums.EMp4Type;

/**
 * Each track type has a different media header (corresponding to media handler-type),
 * which contains only the version and flags, version assigned to 0 in fmp4, VMHD flags=1, and SMHD flags=0
 * 每种音轨类型都有不同的媒体信息头（对应media handler-type）,其只包含版本和flags，fmp4中版本赋值为0，VMHD的flags=1，SMHD的flags=0
 *
 * @author xingshuang
 */
public class Mp4VmhdBox extends Mp4Box {

    /**
     * 1-bytes, version
     */
    private final int version;

    /**
     * 3-bytes flags
     */
    private final byte[] flags;

    /**
     * 2-bytes graphics mode
     */
    private final byte[] graphicsMode;

    /**
     * 6-bytes op color
     */
    private final byte[] opColor;

    public Mp4VmhdBox() {
        this.mp4Type = EMp4Type.VMHD;
        this.version = 0;
        this.flags = new byte[]{0x00, 0x00, 0x01};
        this.graphicsMode = new byte[2];
        this.opColor = new byte[6];
    }

    @Override
    public int byteArrayLength() {
        return 20;
    }

    @Override
    public byte[] toByteArray() {
        int size = this.byteArrayLength();
        return ByteWriteBuff.newInstance(size)
                .putInteger(size)
                .putBytes(this.mp4Type.getByteArray())
                .putByte(this.version)
                .putBytes(this.flags)
                .putBytes(this.graphicsMode)
                .putBytes(this.opColor)
                .getData();
    }
}