MP3:XingFrame VBR

最新推荐文章于 2020-04-28 20:50:42 发布

原创最新推荐文章于 2020-04-28 20:50:42 发布 · 643 阅读

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文章标签：

#stream #byte #class

本文介绍了一个名为XingFrame的类，该类用于处理MP3流中的特定信息，包括帧的数量、文件长度等属性，并提供了读取这些信息的方法。通过构造函数初始化XingFrame对象时，会从提供的MP3流中读取标志位和其他关键数据。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;

namespace WindowsFormsApplication1
{
    public class XingFrame
    {
        private MP3Stream mp3Stream;

        private bool _framesFlag;
        public bool FramesFlag
        {
            get { return _framesFlag; }
        }

        private bool _bytesFlag;
        public bool BytesFlag
        {
            get { return _bytesFlag; }
        }

        private bool _TOCFlag;
        public bool TOCFlag
        {
            get { return _TOCFlag; }
        }

        private bool _VBRScaleFlag;
        public bool VBRScaleFlag
        {
            get { return _VBRScaleFlag; }
        }

        private int _framesCount;
        //帧数量
        public int FramesCount
        {
            get { return _framesCount; }
        }

        private int _fileLength;
        /// <summary>
        /// 文件长度
        /// </summary>
        public int FileLength
        {
            get { return _fileLength; }
        }

private byte[] tocTable;

private byte[] vbrScale;

        private int _frameTime = 26;
        /// <summary>
        /// 毫秒（MS)
        /// </summary>
        public int FrameTime
        {
            get { return _frameTime; }
        }

        public XingFrame(MP3Stream stream)
        {
            mp3Stream = stream;

mp3Stream.Seek(3, SeekOrigin.Current);
byte flag = mp3Stream.ReadByte();

            _framesFlag = (flag & 0x01) == 0x01;
            _bytesFlag = (flag & 0x02) == 0x02;
            _TOCFlag = (flag & 0x04) == 0x04;
            _VBRScaleFlag = (flag & 0x08) == 0x08;

_framesCount = (int)mp3Stream.ReadUInt(4);
_fileLength = (int)mp3Stream.ReadUInt(4);

            tocTable = new byte[100];
            mp3Stream.Read(tocTable, 0, 100);

vbrScale = new byte[4];
mp3Stream.Read(vbrScale, 0, 4);

}
}

}