在 SAPI 文本转语音之前先播放 MediaPlayer 声音 VB.Net

Question

我们使用 Vb.net 2015 和 SQL SERVER 2012 创建了一个排队系统

我们想编程先播放叮咚声（以通知等待队列），然后是文本到语音以读取号码和计数器服务。然而，输出变得相反。它先播放文本到语音 [SAPI]，然后再播放叮咚声。我还注意到，当 SAPI 是 "reading" 文本时，阅读它时时间会冻结。

这是我的代码：

 'play ding dong sound
    Dim fileLoc As String = Application.StartupPath & "\" & "ding dong queue.mp3" '"Reminder.wav" '

    Me.AxWindowsMediaPlayer1.URL = fileLoc

    If (Me.AxWindowsMediaPlayer1.playState = WMPLib.WMPPlayState.wmppsPlaying) Then

        'playStateLabel.Text = "Windows Media Player is playing!"

    Else
        Dim tempString As String = ""

        For Each element As Char In lblTicketNoShow.Text 'seperate each number for tts ex. "1 0 0 1"
            tempString = tempString & element & vbTab
        Next


        Dim tts = CreateObject("SAPI.spvoice")
        tts.rate = -4
        tts.volume = 100
        tts.speak("NOW SERVING " & tempString & " on Counter " & lblCounterNo.Text)


    End If

我的代码有什么问题。我错过了什么吗？

Answer 1

顺便说一句，你不是在等叮咚声播放完。

正如所写，您在媒体播放器对象上设置 URL，然后立即告诉 SAPI 说话。这是一个竞争条件，显然 SAPI 的速度要快一些，从而导致您看到的行为。

您需要 AxWindowsMediaPlayer1 上的 PlayStateChange 事件处理程序；当您从 PlayStateChange 处理程序获得 MediaEnded 事件时，您可以告诉 SAPI 读取下一个事件。（您可能还需要一个 SAPI 事件处理程序来告知 SAPI 何时完成。）

Answer 2

感谢 Eric Brown 我更新了我的代码：

我将事件处理程序添加到我的 AxWindowsPlayer1。这样系统就可以在使用SAPI读取文本之前先判断叮咚声是否结束。

Public Sub player_PlayStateChange(ByVal sender As Object, ByVal e As AxWMPLib._WMPOCXEvents_PlayStateChangeEvent) Handles AxWindowsMediaPlayer1.PlayStateChange

    ' Test the current state of the player, display a message for each state.
    Select Case e.newState

        Case 0 ' Undefined
            'currentStateLabel.Text = "Undefined"

        Case 1 ' Stopped
           ' currentStateLabel.Text = "Stopped"

        Case 2 ' Paused
          '  currentStateLabel.Text = "Paused"

        Case 3 ' Playing
           ' currentStateLabel.Text = "Playing"

        Case 4 ' ScanForward
           ' currentStateLabel.Text = "ScanForward"

        Case 5 ' ScanReverse
           ' currentStateLabel.Text = "ScanReverse"

        Case 6 ' Buffering
            'currentStateLabel.Text = "Buffering"

        Case 7 ' Waiting
           ' currentStateLabel.Text = "Waiting"

        Case 8 ' MediaEnded
            'currentStateLabel.Text = "MediaEnded"
            Dim tempString As String = ""

            For Each element As Char In lblTicketNoShow.Text 'seperate each number for tts ex. "1 0 0 1"
                tempString = tempString & element & vbTab
            Next


            Dim tts = CreateObject("SAPI.spvoice")
            tts.rate = -4
            tts.volume = 100
            tts.speak("NOW SERVING " & tempString & " on Counter " & lblCounterNo.Text)

            Dim controls As WMPLib.IWMPControls3 = Me.AxWindowsMediaPlayer2.Ctlcontrols

            ' Check first to be sure the operation is valid. 
            If (controls.isAvailable("play")) Then

                controls.play()

            End If

        Case 9 ' Transitioning
           ' currentStateLabel.Text = "Transitioning"

        Case 10 ' Ready
            'currentStateLabel.Text = "Ready"

        Case 11 ' Reconnecting
            'currentStateLabel.Text = "Reconnecting"

        Case 12 ' Last
            'currentStateLabel.Text = "Last"

        Case Else
            'currentStateLabel.Text = ("Unknown State: " + e.newState.ToString())

    End Select

End Sub

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