利用 Windows API Code Pack 修改音乐的 ID3 信息

朋友由于抠门 SD 卡买小了，结果音乐太多放不下，又不舍得再买新卡，不得已决定重新转码，把音乐码率压低一点，牺牲点音质来换空间（用某些人的话说，反正不是搞音乐的，听不出差别）…

结果千千静听（百度音乐）转码后会把音乐 ID3 信息里的标题当文件名…（PS:怀念当年的 千千静听…）

结果成了这个模样：

 

由于数量较多，收工改会死人的..

所以只好想办法用程序来批量改

找到了园友的老文章：http://www.cnblogs.com/TianFang/archive/2009/09/27/1574722.html

于是决定用 Windows API Code Pack

不过 MS 网站已经木有 Windows API Code Pack 的链接了

不过找起来也不麻烦

找到后新建工程，添加引用这两个 dll 就可以了

然后在工程里新建类 MediaTags，写入内容如下 ：

    class MediaTags
    {
        #region Mp3文件属性
        /// <summary>
        /// 标题
        /// </summary>
        [MediaProperty("Title")]
        public string Title { get; set; }

        /// <summary>
        /// 子标题
        /// </summary>
        [MediaProperty("Media.SubTitle")]
        public string SubTitle { get; set; }

        /// <summary>
        /// 星级
        /// </summary>
        [MediaProperty("Rating")]
        public uint? Rating { get; set; }

        /// <summary>
        /// 备注
        /// </summary>
        [MediaProperty("Comment")]
        public string Comment { get; set; }

        /// <summary>
        /// 艺术家
        /// </summary>
        [MediaProperty("Author")]
        public string Author { get; set; }

        /// <summary>
        /// 唱片集
        /// </summary>
        [MediaProperty("Music.AlbumTitle")]
        public string AlbumTitle { get; set; }

        /// <summary>
        /// 唱片集艺术家
        /// </summary>
        [MediaProperty("Music.AlbumArtist")]
        public string AlbumArtist { get; set; }

        /// <summary>
        /// 年
        /// </summary>
        [MediaProperty("Media.Year")]
        public uint? Year { get; set; }

        /// <summary>
        /// 流派
        /// </summary>
        [MediaProperty("Music.Genre")]
        public string Genre { get; set; }

        /// <summary>
        /// #
        /// </summary>
        [MediaProperty("Music.TrackNumber")]
        public uint? TrackNumber { get; set; }

        /// <summary>
        /// 播放时间
        /// </summary>
        [MediaProperty("Media.Duration")]
        public string Duration { get; private set; }

        /// <summary>
        /// 比特率
        /// </summary>
        [MediaProperty("Audio.EncodingBitrate")]
        public string BitRate { get; private set; }
        #endregion

        public MediaTags(string mediaPath)
        {
            //var obj = ShellObject.FromParsingName(mp3Path);   //缩略图，只读
            //obj.Thumbnail.Bitmap.Save(@"R:2.jpg");

            Init(mediaPath);
        }

        void Init(string mediaPath)
        {
            using (var obj = ShellObject.FromParsingName(mediaPath))
            {
                var mediaInfo = obj.Properties;
                foreach (var properItem in this.GetType().GetProperties())
                {
                    var mp3Att = properItem.GetCustomAttributes(typeof(MediaPropertyAttribute), false).FirstOrDefault();
                    var shellProper = mediaInfo.GetProperty("System." + mp3Att);
                    var value = shellProper == null ? null : shellProper.ValueAsObject;

                    if (value == null)
                    {
                        continue;
                    }

                    if (shellProper.ValueType == typeof(string[]))    //艺术家，流派等多值属性
                    {
                        properItem.SetValue(this, string.Join(";", value as string[]), null);
                    }
                    else if (properItem.PropertyType != shellProper.ValueType)    //一些只读属性，类型不是string，但作为string输出，避免转换 如播放时间，比特率等
                    {
                        properItem.SetValue(this, value == null ? "" : shellProper.FormatForDisplay(PropertyDescriptionFormatOptions.None), null);
                    }
                    else
                    {
                        properItem.SetValue(this, value, null);
                    }
                }
            }
        }

        public void Commit(string mp3Path)
        {
            var old = new MediaTags(mp3Path);

            using (var obj = ShellObject.FromParsingName(mp3Path))
            {
                var mediaInfo = obj.Properties;
                foreach (var proper in this.GetType().GetProperties())
                {
                    var oldValue = proper.GetValue(old, null);
                    var newValue = proper.GetValue(this, null);

                    if (oldValue == null && newValue == null)
                    {
                        continue;
                    }

                    if (oldValue == null || !oldValue.Equals(newValue))
                    {
                        var mp3Att = proper.GetCustomAttributes(typeof(MediaPropertyAttribute), false).FirstOrDefault();
                        var shellProper = mediaInfo.GetProperty("System." + mp3Att);
                        Console.WriteLine(mp3Att);
                        SetPropertyValue(shellProper, newValue);
                    }
                }
            }
        }

        #region SetPropertyValue
        static void SetPropertyValue(IShellProperty prop, object value)
        {
            if (prop.ValueType == typeof(string[]))        //只读属性不会改变，故与实际类型不符的只有string[]这一种
            {
                string[] values = (value as string).Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
                (prop as ShellProperty<string[]>).Value = values;
            }
            if (prop.ValueType == typeof(string))
            {
                (prop as ShellProperty<string>).Value = value as string;
            }
            else if (prop.ValueType == typeof(ushort?))
            {
                (prop as ShellProperty<ushort?>).Value = value as ushort?;
            }
            else if (prop.ValueType == typeof(short?))
            {
                (prop as ShellProperty<short?>).Value = value as short?;
            }
            else if (prop.ValueType == typeof(uint?))
            {
                (prop as ShellProperty<uint?>).Value = value as uint?;
            }
            else if (prop.ValueType == typeof(int?))
            {
                (prop as ShellProperty<int?>).Value = value as int?;
            }
            else if (prop.ValueType == typeof(ulong?))
            {
                (prop as ShellProperty<ulong?>).Value = value as ulong?;
            }
            else if (prop.ValueType == typeof(long?))
            {
                (prop as ShellProperty<long?>).Value = value as long?;
            }
            else if (prop.ValueType == typeof(DateTime?))
            {
                (prop as ShellProperty<DateTime?>).Value = value as DateTime?;
            }
            else if (prop.ValueType == typeof(double?))
            {
                (prop as ShellProperty<double?>).Value = value as double?;
            }
        }
        #endregion

        #region MediaPropertyAttribute
        [AttributeUsage(AttributeTargets.Property, Inherited = false, AllowMultiple = true)]
        sealed class MediaPropertyAttribute : Attribute
        {
            public string PropertyKey { get; private set; }
            public MediaPropertyAttribute(string propertyKey)
            {
                this.PropertyKey = propertyKey;
            }

            public override string ToString()
            {
                return PropertyKey;
            }
        }
        #endregion
    }

剩下的就很简单了

读取当前文件夹下的所有mp3，批量替换标题

        static void Main(string[] args)
        {
            string fileDirectory = System.IO.Directory.GetCurrentDirectory();
            DirectoryInfo folder = new DirectoryInfo(fileDirectory);

            foreach (FileInfo file in folder.GetFiles("*.mp3"))
            {
                MediaTags mt = new MediaTags(file.FullName);
                mt.Title = file.FullName.Replace(fileDirectory + "\", "").Replace(".mp3", "");
                mt.Commit(file.FullName);
            }
        }

完成效果，剩下批量转换就可以了