修改MP3属性
by 蝈蝈俊.net
Categories: 未分类
Tags: .net 3.0, .net 3.5, .Net 4.0, .net 编程心得, 技术随笔
Comments: 1 Comment
Published on: 2009 年 12 月 02 日
最近在处理一批下载的评书mp3文件时,需要把它们的一些属性做修改为有规律的样式,以便自己播放时知道是播放的那首。
要修改的属性如下:
修改的方法我是使用的 http://www.cnblogs.com/TianFang/archive/2009/09/27/1574722.html 介绍的 使用 WindowsAPICodePack 的方法来修改。
但是上述地址给出的函数有个小bug,且具体如何用代码实现也没有说明,所以整理了这篇博客,
WindowsAPICodePack 在下面地址可以下载:
http://code.msdn.microsoft.com/WindowsAPICodePack
我下载的是 Windows API Code Pack 1.0.1 中的
WindowsAPICodePack.zip
source code, 6927K, uploaded Nov 19
这个是源文件, 下载后打开可以看到 WindowsAPICodePack.sln 文件, 用 Visual Studio 编译后,我们可以得到下面2个文件:
Microsoft.WindowsAPICodePack.dll
Microsoft.WindowsAPICodePack.Shell.dll
这就是我们项目中要引用的两个文件。
引用这两个文件后,再在项目中增加一个文件,内容如下(注意把namespace修改为你自己的):
这个文件中也就是我说的http://www.cnblogs.com/TianFang/archive/2009/09/27/1574722.html 介绍的有小bug的文件,有错误的部分看下面我的注释。文件内容如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.WindowsAPICodePack.Shell;
using Microsoft.WindowsAPICodePack.Shell.PropertySystem;
using System.Reflection;
namespace _52PS_WpfApplication
{
public 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(PropertyDescriptionFormat.Default), 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;
}
// 这里做了修改 郭红俊 20091202
// 原先在旧值存在,新值没有给出时,会有空对象引用的bug
//if (oldValue == null || !oldValue.Equals(newValue))
// 新的逻辑 新值存在时, 则替换旧值
if ((newValue != null) && (newValue.ToString().Trim().Length > 0) && (newValue != oldValue))
{
var mp3Att = proper.GetCustomAttributes(typeof(MediaPropertyAttribute), false).FirstOrDefault();
var shellProper = mediaInfo.GetProperty("System." + mp3Att);
Console.WriteLine(mp3Att);
if (newValue == null) newValue = string.Empty;
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
}
}
使用这个文件的一个简单范例如下:
这个范例修改程序运行时目录下指定规范名字mp3文件的标题属性,当然其他属性也是类似的。
private void btn_2_Click(object sender, RoutedEventArgs e)
{
MediaTags mt = new MediaTags(Environment.CurrentDirectory);
for (int i = 1; i <= 16; i++)
{
string fileName = string.Format("{0}\\童林传_{1:000}.mp3", Environment.CurrentDirectory, i);
mt.Title = string.Format("童林传 {0:000}",i);
mt.Author = "单田芳";
mt.Commit(fileName);
}
}
参考资料:
用C#修改Mp3文件属性
http://www.cnblogs.com/TianFang/archive/2009/09/27/1574722.html

浙公网安备 33010602011771号