前些天看到新聞說Windows10自帶的Windows Media Player將支持FLAC無損播放，而目前自己的播放器是采用BASS音頻庫去支持無損的播放的，BASS音頻庫的用法奇葩不說，文檔也不多，遇到問題網上搜半天都找不着答案真是愁死，於是打算將我的音樂播放器重做一番了，這次重新用回WMP內核。
相信做過WPF媒體方面應用開發的同學都知道，new一個MediaPlayer就可以實現對媒體的操作了，而這個MediaPlayer其實是用的當前操作系統中的Windows Media Player，支持播放暫停停止，播放速率調節，音量設置（BASS的音量設置很蛋疼，會連系統音量都給調了），提供媒體打開，媒體結束，播放錯誤3個事件，因而如果要自己做一個音樂播放器的話，再加上媒體狀態的判斷，以及添加媒體狀態/播放進度改變的事件就差不多了。因為是重做的，所以只實現了一下基礎功能（播放控制，收藏，播放模式）以及幾個個性功能（音樂統計，定時停止，播放進度的顯示），同時BUG還很多，還在繼續開發中，如果有興趣的話可以一起開發喲，項目已經傳到TFS了，地址是http://llyn23.visualstudio.com
Debug目錄文件下載：http://yun.baidu.com/s/1xYWua
Solution項目源代碼下載：http://yun.baidu.com/s/1mguWDCG
1.構建CoreHelper.cs
這個播放器核心類包含媒體的播放，添加取消收藏，切換播放模式，歌曲文件的讀取，媒體庫/播放列表/播放器配置等的保存等
2.數據的保存和讀取
在程序啟動（OnStartUp）時加載XML文件反序列化為對象，保存有媒體庫，播放列表，播放記錄，收藏的歌曲等，退出（OnExit）時則根據對象是否發生改變，將對象序列化到XML文件中
string repository = System.IO.Path.Combine(new string[] { AppDomain.CurrentDomain.BaseDirectory, "Repository" });
if (!System.IO.Directory.Exists(repository))
{
return;
}
//加載播放器設置
PlayerConfig = SerializeHelper.ToEntity<PlayerConfigModel>(repository + "\\PlayerConfig.xml");
//加載媒體庫
MediaCollection = SerializeHelper.ToEntity<List<MediaModel>>(repository + "\\MediaCollection.xml");
//加載播放列表
Playlists = SerializeHelper.ToEntity<List<PlaylistModel>>(repository + "\\Playlists.xml");
//加載播放隊列
PlayQueues = SerializeHelper.ToEntity<List<PlayQueueModel>>(repository + "\\PlayQueues.xml");
//加載播放記錄
PlayRecords = SerializeHelper.ToEntity<List<PlayRecordModel>>(repository + "\\PlayRecords.xml");
//加載收藏列表
Favorites = SerializeHelper.ToEntity<List<FavoriteModel>>(repository + "\\Favorites.xml");
//初始化計數器
AutoStopCounter = PlayerConfig.AutoStopTimeset;
string repository = System.IO.Path.Combine(new string[] { AppDomain.CurrentDomain.BaseDirectory, "Repository" });
if (!System.IO.Directory.Exists(repository))
{
try
{
System.IO.Directory.CreateDirectory(repository);
}
catch (Exception ex)
{
LogHelper.Error(ex.Message);
return;
}
}
//保存播放器設置
if (IsPlayerConfigChanged)
{
SerializeHelper.ToXml<PlayerConfigModel>(PlayerConfig, repository + "\\PlayerConfig.xml");
}
//保存媒體庫
if (IsMediaCollectionChanged)
{
SerializeHelper.ToXml<List<MediaModel>>(MediaCollection, repository + "\\MediaCollection.xml");
}
2.樣式和資源使用方面
界面元素的背景圖片和顏色，字體顏色和字體大小全部存放在Application的資源字典中，可以通過代碼動態更新
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Resources/Color.xaml"></ResourceDictionary>
<ResourceDictionary Source="/Resources/ImageBrush.xaml"></ResourceDictionary>
<ResourceDictionary Source="/Resources/LinearGradientBrush.xaml"></ResourceDictionary>
<ResourceDictionary Source="/Resources/SolidBrush.xaml"></ResourceDictionary>
<ResourceDictionary Source="/Styles/Border.xaml"></ResourceDictionary>
<ResourceDictionary Source="/Styles/TextBlock.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
3.播放控制核心部分
其實就是處理MediaPlayer的4個事件，MediaOpened，MediaFailed，MediaEnded，以及自己加的事件MediaPositionChanging
private static void _mainPlayer_MediaOpened(object sender, EventArgs e)
{
//設置當前媒體
CurrentMedia = MediaCollection.Where(w => w.FullName == HttpUtility.UrlDecode(MainPlayer.Source.AbsolutePath).Replace("/", "\\")).FirstOrDefault();
}
private static void _mainPlayer_MediaFailed(object sender, ExceptionEventArgs e)
{
PlayerStatus = PlayerStatusEnum.已停止;
LogHelper.Error(e.ErrorException.Message);
}
private static void _mainPlayer_MediaEnded(object sender, EventArgs e)
{
//添加播放記錄
IsPlayRecordsChanged = true;
PlayRecords.Add(new PlayRecordModel
{
CreatedAt = DateTime.Now,
Media = CurrentMedia.FullName
});
//設置播放器狀態
PlayerStatus = PlayerStatusEnum.已停止;
//根據播放模式來決定接下要播放的歌曲
switch (PlayerConfig.PlayMode)
{
case (int)PlayModeEnum.單曲循環:
{
PlayByRepeat();
break;
}
case (int)PlayModeEnum.列表循環:
{
PlayByRecycle();
break;
}
case (int)PlayModeEnum.順序播放:
{
PlayByOrder();
break;
}
case (int)PlayModeEnum.隨機播放:
{
PlayByRandom();
break;
}
}
}
//CoreHelper.cs中觸發媒體播放進度改變事件
private static void _mainTimer1_Tick()
{
if (IsAutoStopOpened && AutoStopCounter <= 0)
{
//停止播放（跨線程處理）
MainPlayer.Dispatcher.Invoke(new Action(() =>
{
Stop();
}));
AutoStopCounter = PlayerConfig.AutoStopTimeset;
IsAutoStopOpened = false;
return;
}
if (PlayerStatus == PlayerStatusEnum.播放中)
{
AutoStopCounter -= 1;
MediaPositionChanging();
}
}
//在UI線程中處理媒體播放進度事件
CoreHelper.MediaPositionChanging += CoreHelper_MediaPositionChanging;
private void CoreHelper_MediaPositionChanging()
{
this.Dispatcher.Invoke(new Action(() =>
{
DisplayAutoStop();
TimeSpan duration = TimeSpan.FromSeconds(0);
if (CoreHelper.MainPlayer.NaturalDuration.HasTimeSpan)
{
duration = CoreHelper.MainPlayer.NaturalDuration.TimeSpan;
}
double percent = 0;
if (duration.TotalSeconds > 0)
{
percent = CoreHelper.MainPlayer.Position.TotalSeconds / duration.TotalSeconds;
}
//顯示媒體播放進度背景
gs2.Offset = percent;
gs3.Offset = percent;
//顯示媒體播放進度和總持續時間文本
_mediaPositionTextBlock.Text = String.Format("{0}/{1}", StringHelper.GetTimeSpanString(CoreHelper.MainPlayer.Position), StringHelper.GetTimeSpanString(duration));
}));
}
5.更新媒體庫
這里主要涉及到從文件中讀取歌曲信息，所以一個步驟是遞歸讀取文件夾中的文件，第二步驟是讀取歌曲信息（通過第三方類庫ID3.dll,TagLib.dll）,第三步驟是在UI上實時讀取狀態
public static void FindMatchedFile(string folder, List<string> extensions, double minFileLength, double maxFileLength, UpdateMediaCollectionEventHandler callback)
{
string[] files = System.IO.Directory.GetFiles(folder, "*.*", SearchOption.TopDirectoryOnly);
FileInfo info = null;
foreach (string file in files)
{
info = new FileInfo(file);
if (!extensions.Contains(System.IO.Path.GetExtension(file).ToLower()))
{
continue;
}
if (info.Length < minFileLength)
{
continue;
}
if (info.Length > maxFileLength)
{
continue;
}
//通過委托去通知前端UI
callback(file, AddToMediaCollection(info));
}
string[] directories = System.IO.Directory.GetDirectories(folder, "", SearchOption.TopDirectoryOnly);
foreach (string directory in directories)
{
FindMatchedFile(directory, extensions, minFileLength, maxFileLength, callback);
}
}
public static int AddToMediaCollection(FileInfo file)
{
ID3Info id3 = null;
try
{
id3 = new ID3Info(file.FullName, true);
}
catch (Exception ex)
{
LogHelper.Error(ex.Message);
return -1;
}
MediaModel media = new MediaModel();
//創建的時間
media.CreatedTime = DateTime.Now;
//文件長度
media.FileLength = file.Length;
//文件全路徑
media.FullName = file.FullName;
//歌曲的專輯
media.Album = id3.ID3v2Info.GetTextFrame("TALB") ?? "未知專輯";
//歌曲的藝術家
media.Artists = id3.ID3v2Info.GetTextFrame("TPE1") ?? "未知歌手";
//歌曲的標題
media.Title = id3.ID3v2Info.GetTextFrame("TIT2") ?? System.IO.Path.GetFileNameWithoutExtension(file.FullName);
TagLib.File f = null;
try
{
f = TagLib.File.Create(file.FullName);
//歌曲的持續時間
media.Duration = f.Properties.Duration.TotalSeconds;
//保存歌曲封面
if (f.Tag.Pictures.Length > 0)
{
string folder = System.IO.Path.Combine(new string[] { AppDomain.CurrentDomain.BaseDirectory, "Repository", "Cover" });
if (!System.IO.Directory.Exists(folder))
{
System.IO.Directory.CreateDirectory(folder);
}
byte[] bytes = f.Tag.Pictures[0].Data.Data;
string cover = System.IO.Path.Combine(new string[] { folder, StringHelper.RemoveSpecialCharacters(media.Album) + ".jpg" });
using (FileStream fs = new FileStream(cover, FileMode.Create))
{
fs.Write(bytes, 0, bytes.Length);
}
}
}
catch (Exception ex)
{
LogHelper.Debug(ex.Message);
}
MediaModel model = MediaCollection.Where(w => w.FullName == file.FullName).FirstOrDefault();
if (model == null || String.IsNullOrEmpty(model.FullName))
{
MediaCollection.Add(media);
LogHelper.Debug("添加了一個媒體：" + file.FullName);
return 1;
}
//更新媒體信息
model.Album = media.Album;
model.Artists = media.Artists;
model.Duration = media.Duration;
model.FileLength = media.FileLength;
model.Title = media.Title;
LogHelper.Debug("更新了一個媒體：" + file.FullName);
return 0;
}
private List<int> _operations = null;
private void UpdateMediaCollectionTextBlock_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
UpdateMediaCollectionTextBlock.IsEnabled = false;
ProcessingMediaTextBlock.Visibility = Visibility.Visible;
_operations = new List<int>();
//開啟線程更新媒體庫
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
worker.RunWorkerAsync();
}
private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
UpdateMediaCollectionTextBlock.IsEnabled = true;
ProcessingMediaTextBlock.Visibility = Visibility.Collapsed;
int succeed = _operations.Count(c => c == 1);
int updated = _operations.Count(c => c == 0);
int failed = _operations.Count(c => c < 0);
if (succeed > 0 || updated > 0)
{
CoreHelper.IsMediaCollectionChanged = true;
}
UiHelper.ShowPrompt(String.Format("新增：{0}個，更新：{1}個，失敗：{2}個", succeed, updated, failed));
_operations = null;
}