GAMBAS-BUCH 3.19.5

Die Klasse MediaLink repräsentiert die Verbindung zwischen zwei MediaControl-Objekten und findet lediglich in der Methode GetLink(…) der MediaControl-Klasse Verwendung. Diese Klasse kann nicht erzeugt werden.

Die Klasse MediaLink verfügt nur über diese vier relevanten Eigenschaften:

Tabelle 23.9.5.1.1 : Eigenschaften der Klasse MediaLink

Abbildung 23.9.5.1.1: MediaPipeline mit Links

Die Verlinkung der MediaControls erfolgt im folgenden Quelltext-Abschnitt in den Zeilen 11 und 12. Es wird dann in den Zeilen 25 bis 46 gezeigt, wie Sie Informationen zum Steuerelement mcConvert auslesen und anzeigen können:

  [1] Private mpPipeline As MediaPipeline
  [2] Private mcSource As MediaControl
  [3] Private mcConvert As MediaControl
  [4] Private mcSink As MediaControl
  [5]
  [6] Public Sub CreateAndPlayPipeline()
  [7]
  [8]     Dim i As Integer
  [9]     Dim hInputs As String[]
  [10]     Dim hOutputs As String[]
  [11]
  [12]     mpPipeline = New MediaPipeline As "hPipeline"
  [13]
  [14]     mcSource = New MediaControl(mpPipeline, "uridecodebin")
  [15] '-- ["uri"] is a property of the MediaControl 'mcsource' or the Gstreamer element 'uridecodebin'.
  [16]     mcSource["uri"] = ComboBox1.Text
  [17]     mcConvert = New MediaControl(mpPipeline, "audioconvert")
  [18]     mcSink = New MediaControl(mpPipeline, "autoaudiosink")
  [19]
  [20]     mcSource.LinkLaterTo(mcConvert)
  [21]     mcConvert.LinkTo(mcSink)
  [22]
  [23]     mpPipeline.Play()
  [24]
  [25]     hInputs = mcConvert.Inputs
  [26]     For i = 0 To hInputs.Max
  [27]       Print "mcConvert-Input: "; i; hInputs[i]
  [28]     Next
  [29]     hOutputs = mcConvert.Outputs
  [30]     For i = 0 To hOutputs.Max
  [31]       Print "mcConvert-Output: "; i; hOutputs[i]
  [32]     NexthOutputs[i]
  [33]     Next
  [34]
  [35]     Print "\nMediaLink parameters around the mcConvert input:"
  [36]     Print "------------------------------------------------"
  [37]     Print "Type of mcConvert input: "; mcConvert.GetLink("sink").Name
  [38]     Print "Name of mcConvert MediaControl of other side :"; mcConvert.GetLink("sink").Peer.Name
  [39]     Print "Name of output of other side of mcConvert: "; mcConvert.GetLink("sink").Output
  [40]
  [41]
  [42]     Print "\nMediaLink parameters around the mcConvert output:"
  [43]     Print "-------------------------------------------------"
  [44]     Print "Type of mcConvert output: "; mcConvert.GetLink("src").Name
  [45]     Print "Name of mcConvert MediaControl of other side: "; mcConvert.GetLink("src").Peer.Name
  [46]     Print "Name of input of other side of mcConvert: "; mcConvert.GetLink("src").Input

Das sind die Ausgaben in der Konsole der IDE:

mcConvert-Input:  0  sink
mcConvert-Output:  0  src

MediaLink parameters around the mcConvert input:
------------------------------------------------
Type of mcConvert input: sink
Name of mcConvert MediaControl of other side: uridecodebin0
Name of output of other side of mcConvert: src_0

MediaLink parameters around the mcConvert output:
-------------------------------------------------
Type of mcConvert output: src
Name of mcConvert MediaControl of other side: autoaudiosink0
Name of input of other side of mcConvert: sink