PCL-Communist/Plain Craft Launcher 2/Modules/ModMusic.vb

Public Module ModMusic

#Region "播放列表"

    ''' <summary>
    ''' 接下来要播放的音乐文件路径。未初始化时为 Nothing。
    ''' </summary>
    Public MusicWaitingList As List(Of String) = Nothing
    ''' <summary>
    ''' 全部音乐文件路径。未初始化时为 Nothing。
    ''' </summary>
    Public MusicAllList As List(Of String) = Nothing
    ''' <summary>
    ''' 初始化音乐播放列表。
    ''' </summary>
    ''' <param name="ForceReload">强制全部重新载入列表。</param>
    ''' <param name="IgnoreFirst">在重载列表时避免让某项成为第一项。</param>
    Private Sub MusicListInit(ForceReload As Boolean, Optional IgnoreFirst As String = "")
        If ForceReload Then MusicAllList = Nothing
        Try
            '初始化全部可用音乐列表
            If MusicAllList Is Nothing Then
                MusicAllList = New List(Of String)
                Directory.CreateDirectory(Path & "PCL\Musics\")
                For Each File In EnumerateFiles(Path & "PCL\Musics\")
                    '文件夹可能会被加入 .ini 文件夹配置文件、一些乱七八糟的 .jpg 文件啥的
                    Dim Ext As String = File.Extension.ToLower
                    If {".ini", ".jpg", ".txt", ".cfg", ".lrc", ".db", ".png"}.Contains(Ext) Then Continue For
                    MusicAllList.Add(File.FullName)
                Next
            End If
            '打乱顺序播放
            MusicWaitingList = If(Setup.Get("UiMusicRandom"), Shuffle(New List(Of String)(MusicAllList)), New List(Of String)(MusicAllList))
            If Not IgnoreFirst = "" AndAlso Not Not MusicWaitingList.Any() AndAlso MusicWaitingList(0) = IgnoreFirst Then
                '若需要避免成为第一项的为第一项，则将它放在最后
                MusicWaitingList.RemoveAt(0)
                MusicWaitingList.Add(IgnoreFirst)
            End If
        Catch ex As Exception
            Log(ex, "初始化音乐列表失败", LogLevel.Feedback)
        End Try
    End Sub
    ''' <summary>
    ''' 获取下一首播放的音乐路径并将其从列表中移除。
    ''' </summary>
    Private Function DequeueNextMusicAddress() As String
        '初始化，确保存在音乐
        If MusicAllList Is Nothing OrElse Not MusicAllList.Any() OrElse Not MusicWaitingList.Any() Then MusicListInit(False)
        '出列下一个音乐，如果出列结束则生成新列表
        DequeueNextMusicAddress = MusicWaitingList(0)
        MusicWaitingList.RemoveAt(0)
        If Not MusicWaitingList.Any() Then MusicListInit(False, DequeueNextMusicAddress)
    End Function

#End Region

#Region "UI 控制"

    ''' <summary>
    ''' 刷新背景音乐按钮 UI 与设置页 UI。
    ''' </summary>
    Private Sub MusicRefreshUI()
        RunInUi(Sub()
                    Try

                        If Not MusicAllList.Any() Then
                            '无背景音乐
                            FrmMain.BtnExtraMusic.Show = False
                        Else
                            '有背景音乐
                            FrmMain.BtnExtraMusic.Show = True

                            Dim ToolTipText As String = "正在播放：" & GetFileNameWithoutExtentionFromPath(MusicCurrent)
                            If MusicState = MusicStates.Pause Then
                                FrmMain.BtnExtraMusic.Logo = Logo.IconPlay
                                FrmMain.BtnExtraMusic.LogoScale = 0.8
                                If MusicAllList.Count > 1 Then ToolTipText += vbCrLf & "左键播放，右键播放下一曲。"
                            Else
                                FrmMain.BtnExtraMusic.Logo = Logo.IconMusic
                                FrmMain.BtnExtraMusic.LogoScale = 1
                                If MusicAllList.Count > 1 Then ToolTipText += vbCrLf & "左键暂停，右键播放下一曲。"
                            End If
                            FrmMain.BtnExtraMusic.ToolTip = ToolTipText
                            ToolTipService.SetVerticalOffset(FrmMain.BtnExtraMusic, If(ToolTipText.Contains(vbLf), 10, 16))
                        End If
                        If FrmSetupUI IsNot Nothing Then FrmSetupUI.MusicRefreshUI()

                    Catch ex As Exception
                        Log(ex, "刷新背景音乐 UI 失败", LogLevel.Feedback)
                    End Try
                End Sub)
    End Sub

    ''' <summary>
    ''' 让音乐在暂停、播放间切换，并显示提示文本。
    ''' </summary>
    Public Sub MusicControlPause()
        If MusicNAudio Is Nothing Then
            Hint("音乐播放尚未开始！", HintType.Critical)
        Else
            Select Case MusicState
                Case MusicStates.Pause
                    MusicResume()
                Case MusicStates.Play
                    MusicPause()
                Case Else
                    Log("[Music] 音乐目前为停止状态，已强制尝试开始播放", LogLevel.Debug)
                    MusicRefreshPlay(False)
            End Select
        End If
    End Sub

    ''' <summary>
    ''' 播放下一曲，并显示提示文本。
    ''' </summary>
    Public Sub MusicControlNext()
        If MusicAllList.Count = 1 Then
            Hint("播放列表中仅有一首歌曲！")
        Else
            Dim Address As String = DequeueNextMusicAddress()
            MusicStartPlay(Address)
            Hint("正在播放：" & GetFileNameFromPath(Address), HintType.Finish)
            MusicRefreshUI()
        End If
    End Sub

#End Region

#Region "主状态控制"

    ''' <summary>
    ''' 获取当前的音乐播放状态。
    ''' </summary>
    Public ReadOnly Property MusicState As MusicStates
        Get
            If MusicNAudio Is Nothing Then Return MusicStates.Stop
            Select Case MusicNAudio.PlaybackState
                Case 0 'NAudio.Wave.PlaybackState.Stopped
                    Return MusicStates.Stop
                Case 2 'NAudio.Wave.PlaybackState.Paused
                    Return MusicStates.Pause
                Case Else
                    Return MusicStates.Play
            End Select
        End Get
    End Property
    Public Enum MusicStates
        [Stop]
        Play
        Pause
    End Enum

    '重载与开始

    ''' <summary>
    ''' 重载播放列表并尝试开始播放背景音乐。
    ''' </summary>
    ''' <param name="ShowHint">是否显示刷新提示。</param>
    Public Sub MusicRefreshPlay(ShowHint As Boolean, Optional IsFirstLoad As Boolean = False)
        Try

            MusicListInit(True)
            If Not MusicAllList.Any() Then
                If MusicNAudio Is Nothing Then
                    If ShowHint Then Hint("未检测到可用的背景音乐！", HintType.Critical)
                Else
                    MusicNAudio = Nothing
                    If ShowHint Then Hint("背景音乐已清除！", HintType.Finish)
                End If
            Else
                Dim Address As String = DequeueNextMusicAddress()
                Try
                    MusicStartPlay(Address, IsFirstLoad)
                    If ShowHint Then Hint("背景音乐已刷新：" & GetFileNameFromPath(Address), HintType.Finish, False)
                Catch
                End Try
            End If
            MusicRefreshUI()

        Catch ex As Exception
            Log(ex, "刷新背景音乐播放失败", LogLevel.Feedback)
        End Try
    End Sub
    ''' <summary>
    ''' 开始播放音乐。
    ''' </summary>
    Private Sub MusicStartPlay(Address As String, Optional IsFirstLoad As Boolean = False)
        Log("[Music] 播放开始：" & Address)
        MusicCurrent = Address
        RunInNewThread(Sub() MusicLoop(IsFirstLoad), "Music", ThreadPriority.BelowNormal)
    End Sub

    '播放与暂停

    ''' <summary>
    ''' 暂停音乐播放，返回是否成功切换了状态。
    ''' </summary>
    Public Function MusicPause() As Boolean
        If MusicState = MusicStates.Play Then
            RunInThread(
            Sub()
                Log("[Music] 已暂停播放")
                MusicNAudio?.Pause()
                MusicRefreshUI()
            End Sub)
            Return True
        Else
            Log($"[Music] 无需暂停播放，当前状态为 {MusicState}")
            Return False
        End If
    End Function
    ''' <summary>
    ''' 继续音乐播放，返回是否成功切换了状态。
    ''' </summary>
    Public Function MusicResume() As Boolean
        If MusicState = MusicStates.Play OrElse Not MusicAllList.Any() Then
            Log($"[Music] 无需继续播放，当前状态为 {MusicState}")
            Return False
        Else
            RunInThread(
            Sub()
                Log("[Music] 已恢复播放")
                MusicNAudio?.Play()
                MusicRefreshUI()
            End Sub)
            Return True
        End If
    End Function

#End Region

    ''' <summary>
    ''' 当前正在播放的 NAudio.Wave.WaveOut。
    ''' </summary>
    Public MusicNAudio = Nothing
    ''' <summary>
    ''' 当前播放的音乐地址。
    ''' </summary>
    Private MusicCurrent As String = ""

    ''' <summary>
    ''' 在 MusicUuid 不变的前提下，持续播放某地址的音乐，且在播放结束后随机播放下一曲。
    ''' </summary>
    Private Sub MusicLoop(Optional IsFirstLoad As Boolean = False)
        Dim CurrentWave As NAudio.Wave.WaveOut = Nothing
        Dim Reader As NAudio.Wave.WaveStream = Nothing
        Try
            '开始播放
            CurrentWave = New NAudio.Wave.WaveOut()
            MusicNAudio = CurrentWave
            Reader = New NAudio.Wave.AudioFileReader(MusicCurrent)
            CurrentWave.Init(Reader)
            CurrentWave.Play()
            '第一次打开的暂停
            If IsFirstLoad AndAlso Not Setup.Get("UiMusicAuto") Then CurrentWave.Pause()
            MusicRefreshUI()
            '停止条件：播放完毕或变化
            Dim PreviousVolume = 0
            While CurrentWave.Equals(MusicNAudio) AndAlso Not CurrentWave.PlaybackState = NAudio.Wave.PlaybackState.Stopped
                If Setup.Get("UiMusicVolume") <> PreviousVolume Then
                    '更新音量
                    PreviousVolume = Setup.Get("UiMusicVolume")
                    CurrentWave.Volume = PreviousVolume / 1000
                End If
                '更新进度条
                Dim Percent = Reader.CurrentTime.TotalMilliseconds / Reader.TotalTime.TotalMilliseconds
                RunInUi(Sub() FrmMain.BtnExtraMusic.Progress = Percent)
                Thread.Sleep(100)
            End While
            '当前音乐已播放结束，继续下一曲
            If CurrentWave.PlaybackState = NAudio.Wave.PlaybackState.Stopped AndAlso MusicAllList.Any Then MusicStartPlay(DequeueNextMusicAddress)
        Catch ex As Exception
            Log("[Music] 播放音乐失败的文件完整路径：" & MusicCurrent)
            If TypeOf ex Is NAudio.MmException AndAlso (ex.Message.Contains("NoDriver") OrElse ex.Message.Contains("BadDeviceId")) Then
                Hint("由于音频设备变更，音乐播放功能在重启 PCL 后才能恢复！", HintType.Critical)
                Thread.Sleep(1000000000)
            End If
            If ex.Message.Contains("Got a frame at sample rate") OrElse ex.Message.Contains("does not support changes to") Then
                Hint("播放音乐失败（" & GetFileNameFromPath(MusicCurrent) & "）：PCL 不支持播放音频属性在中途发生变化的音乐", HintType.Critical)
            ElseIf Not (MusicCurrent.EndsWithF(".wav", True) OrElse MusicCurrent.EndsWithF(".mp3", True) OrElse MusicCurrent.EndsWithF(".flac", True)) Then
                Hint("播放音乐失败（" & GetFileNameFromPath(MusicCurrent) & "）：PCL 可能不支持此音乐格式，请将格式转换为 .wav、.mp3 或 .flac 后再试", HintType.Critical)
            Else
                Log(ex, "播放音乐失败（" & GetFileNameFromPath(MusicCurrent) & "）", LogLevel.Hint)
            End If
            Thread.Sleep(1000)
            If TypeOf ex Is FileNotFoundException Then
                MusicRefreshPlay(True, IsFirstLoad)
            ElseIf MusicAllList.Count > 1 Then
                MusicStartPlay(DequeueNextMusicAddress(), IsFirstLoad)
            End If
        Finally
            If CurrentWave IsNot Nothing Then CurrentWave.Dispose()
            If Reader IsNot Nothing Then Reader.Dispose()
            MusicRefreshUI()
        End Try
    End Sub

End Module