C# 解码长ID3V2帧

所以，我写了一个有趣的程序来收集储存在ID3标签中的MP3信息。（ID3v1很简单，这很麻烦！）

我使用的一般过程是读取帧ID（4字节），然后读取长度（4字节），然后读取数据（长度字节）

读取长度时，它是一个Syncsafe整数，因此每个字节的顶部位基本上应为0。这对于小数据帧来说似乎很好，但当它们变长时，我偶尔会在长度字段中遇到一个字节，该字节的顶部位为1。按照ID3规范的惯例，我应该忽略这一点，但这样做会导致算法出错，只得到部分标记

特别是标签的快速转储：

COMM<bh:00><bh:00><bh:00><bh:c6><bh:00><bh:00><bh:00>eng<bh:00>ABC123 ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT KYLE

开始c123 ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT KYLE

此时，长度为$00C6，作为BigEndian int，它是198，从技术上讲，它是这里标记的长度。然而，二进制中的c6是11000110。sync-safe算法将第一个位核化，然后计数变为70，这是不正确的。我已经让Winamp 2.95和iTunes 10对帧长度进行了调整。我不明白。是否有一个条件，我应该寻找同步安全的整数，或只是保持它，因为它是通过这些帧读取

源代码：

FileStream fs = new FileStream(@"D:\commtag.dat",FileMode.Open,FileAccess.Read);
string frameID = ID3v2.ReadStream(fs, 4);
int i = ID3v2.ReadBEInt32(fs);
int j = ID3v2.UnSyncSafe(i);

[...]

public static int ReadBEInt32(Stream mp3File) {
    byte[] buffer = new byte[4];
    mp3File.Read(buffer, 0, 4);
    UInt32 rawInt = BitConverter.ToUInt32(buffer, 0);

    //if the endianness is not BigEndian, as provided in the ID3 tag, convert it
    if(BitConverter.IsLittleEndian) {
        rawInt = (rawInt >> 24) |
            ((rawInt << 8) & 0x00FF0000) |
            ((rawInt >> 8) & 0x0000FF00) |
            (rawInt << 24);
    }

    byte mask = 0x7F;

    return (int)rawInt;
}

public static int UnSyncSafe(int inData) {
    int outData = 0, mask = 0x7F000000;
    while(mask > 0) {
        outData >>= 1;
        outData |= inData & mask;
        mask >>= 8;
    }
    return outData;
}

FileStream fs=newfilestream（@“D:\commtag.dat”，FileMode.Open，FileAccess.Read）；
字符串frameID=ID3v2.ReadStream（fs，4）；
inti=ID3v2.ReadBEInt32（fs）；
int j=ID3v2.UnSyncSafe（i）；
[...]
公共静态int ReadBEInt32（流mp3File）{
字节[]缓冲区=新字节[4]；
mp3File.Read（缓冲区，0,4）；
UInt32 rawInt=BitConverter.ToUInt32（缓冲区，0）；
//如果endianness不是BigEndian，如ID3标记中提供的那样，则将其转换为BigEndian
if（位转换器.IsLittleEndian）{
拉温特=（拉温特>>24）|
（（rawInt>8）和0x0000FF00）|
（罗温特0）{
outData>>=1；
outData |=inData和mask；
掩码>>=8；
}
返回数据；
}

运行该示例后，i和j的值分别为198和70

这是完整的标题（frhed dump，它稍微进入MP3标题的开头）：

ID3TENC@WXXXTCOPTOPETCOMTCONTRCKTYERTALBTPE1TIT2COMMengABC123ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT ID3v2COMMENT KYLE I AM ITUNES

示例中的标记为2.3版。通常在2.3帧中不使用同步安全整数，仅在标记标头中使用。在2.4版中，标头和帧中都使用同步安全整数

---

示例中的标记为2.3版。通常在2.3帧中不使用同步安全整数，仅在标记标头中使用。在2.4版中，标头和帧中都使用同步安全整数

---

ID3v2的每个版本在存储帧头的方式上都不同

• ID3v2.2帧头长度为6字节，最后3个字节为大端无符号整数
• ID3v2.3帧头的长度为10字节，第二个4字节为大端无符号整数。当然，如果ID3v2标记未同步，则可能会有额外的字节
• ID3v2.4帧头长度为10字节，第二个4字节为大端非同步无符号整数。当然，除非媒体播放器有缺陷

以下是我在库中使用的代码：

---

输入基本上是已删除任何不同步字节的字节数组。

ID3v2的每个版本在存储帧头的方式上都不同

• ID3v2.2帧头长度为6字节，最后3个字节为大端无符号整数
• ID3v2.3帧头的长度为10字节，第二个4字节为大端无符号整数。当然，如果ID3v2标记未同步，则可能会有额外的字节
• ID3v2.4帧头长度为10字节，第二个4字节为大端非同步无符号整数。当然，除非媒体播放器有缺陷

以下是我在库中使用的代码：

---

输入基本上是一个已删除任何不同步字节的字节数组。

但您必须小心。虽然ID3v2.4帧应该是同步安全的，但我看到iTunes在2.4中使用正常整数写入图像帧。但您必须小心。虽然ID3v2.4帧应该是同步安全的，我见过iTunes在2.4中使用普通整数编写图像帧。

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