Regarding the issue of writing Audition XMP to MP3.

[LiamYuan]

Hello, I am a Chinese developer and currently I am experiencing issues with reading and writing XMP in MP3.

code:
var track = new ATL.Track(filePath);
track.AdditionalFields ??= new Dictionary<string, string>();
track.AdditionalFields.Add("PRIV:XMP", label);
// track.AdditionalFields["PRIV:XMP"] = label;
track.Save();

label=.....

The goal is to write audition XMP to MP3, but after writing, it becomes：
PRIV:XMP

Why add the keyname before the value? Thank you

[Zeugma440]

Hey there,

The writing bit looks fine : track.AdditionalFields.Add("PRIV:XMP", label);

As for the reading bit, I can't help you as I don't know what MetaHelper.loadMeta does. If you need help, you should post code using the ATL API.

[LiamYuan]

There is no problem reading the audition xmp and it will load normally.

 public static string LoadMeta(string file)
    {
        try
        {         
            var track = new ATL.Track(file);

            if (track.AdditionalFields != null && track.AdditionalFields.Count > 0)
            {
                // 尝试查找可能的私有数据字段
                // ID3v2 私有帧通常以 "PRIV" 开头或包含特定标识符
                var privateDataKeys = track.AdditionalFields.Keys
                    .Where(k => k.Contains("PRIV", StringComparison.OrdinalIgnoreCase) ||
                                k.Contains("PRIVATE", StringComparison.OrdinalIgnoreCase))
                    .ToArray();

                if (privateDataKeys.Length > 0)
                {
                    // 优先取第二个，否则取前5个中的第一个
                    var targetKey = privateDataKeys.Skip(1).FirstOrDefault()
                                    ?? privateDataKeys.Take(5).FirstOrDefault();

                    if (targetKey != null && track.AdditionalFields.TryGetValue(targetKey, out var privateData))
                    {
                        string fixedText =Encoding.UTF8.GetString(
                            Encoding.GetEncoding("ISO-8859-1").GetBytes(privateData?.ToString() ?? string.Empty)
                        );
                        return fixedText;
                    }
                }

                // 如果没有找到标准私有帧，尝试查找特定字段
                // 这里根据实际需求调整查找逻辑
                var customFields = track.AdditionalFields
                    .Where(kvp => kvp.Key.StartsWith("custom", StringComparison.OrdinalIgnoreCase) ||
                                  kvp.Key.StartsWith("user", StringComparison.OrdinalIgnoreCase))
                    .ToArray();

                if (customFields.Length > 0)
                {
                    var targetField = customFields.Skip(1).Select(f => f.Value).FirstOrDefault()
                                      ?? customFields.Take(5).Select(f => f.Value).FirstOrDefault();

                    return targetField?.ToString() ?? string.Empty;
                }
            }
       
        }
        catch (Exception ex)
        {
            ZLogHelper.Instance.LogError("AudioHelper_LoadMeta", ex);
           
        }
     return string.Empty;
    }

[Zeugma440]

Okay, I see where the problem is.

According to the wiki page about non-standard fields, you should name your field PRIV.XMP instead of PRIV:XMP

[LiamYuan]

Similarly, it is the same issue that causes the audition to fail to load

[Zeugma440]

Did you try what I suggested? Does it work?

[LiamYuan]

Did you try what I suggested? Does it work?

I have tried it, but the result is still PRIV.XMP added in front of it