AddMutualExclusion Method

'Declaration
 
Public Sub AddMutualExclusion( _
   ByVal ME As WMMutualExclusion _
) 

Public _result As Boolean = False
      Public _form As ConvertCtrlForm = New ConvertCtrlForm()
      Private Const CODEC_AUDIO_MSAUDIO As Integer = 353 ' Microsoft WMAudio
      Private Const CODEC_VIDEO_WMV1 As Integer = 827739479 ' FOURCC( "W"c, "M"c, "V"c, "1"c )

      Public Sub AddStreamExample()
         Dim convertctrl As ConvertCtrl = _form.ConvertCtrl
         Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "ConvertCtrl_Source.avi")
         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "WMProfile_RemoveStreamExample.avi")

         Try
            Dim manager As WMProfileManager = New WMProfileManager()

            ' create a WMProfile
            convertctrl.WMProfile = CreateCustomProfile(manager)

            ' get the video stream and remove it from the config
            Dim strm As WMStreamConfig = convertctrl.WMProfile.GetStream(0)
            convertctrl.WMProfile.RemoveStream(strm)

            ' dispose of the manager
            manager.Dispose()
         Catch e1 As Exception
            _result = False
         End Try

         ' we'll loop on the state and pump messages for this example.
         ' but you should not need to if running from a Windows Forms application.
         Do While convertctrl.State = ConvertState.Running
            Application.DoEvents()
         Loop
      End Sub

      Private Function CreateCustomProfile(ByVal manager As WMProfileManager) As WMProfile
         Dim profile As WMProfile = manager.CreateEmptyProfile(WMT_Version.V8)
         profile.Name = "Custom Profile"
         profile.Description = "Custom Profile Description"

         Dim added As Boolean = AddAudioStream(manager, profile, 1, CODEC_AUDIO_MSAUDIO, 8000, 8000, 1, True)

         Dim i As Integer = 0
         Do While (i <= 4)
            AddVideoStream(manager, profile, (2 + i), CODEC_VIDEO_WMV1, (1024 * 20) + i * 1024, 320, 240, 5 * (i + 1), 0, 8)
            i += 1
         Loop

         '  mark all the video streams for mutual exclusion
         AddMutexObject(profile, 2, 5)
         Return profile
      End Function

         Private Function AddVideoStream(ByVal manager As WMProfileManager, _
                                         ByVal profile As WMProfile, _
                                         ByVal streamnum As Integer, _
                                         ByVal fourcc As Long, _
                                         ByVal bitrate As Integer, _
                                         ByVal width As Integer, _
                                         ByVal height As Integer, _
                                         ByVal fps As Integer, _
                                         ByVal quality As Integer, _
                                         ByVal secperkey As Integer) As Boolean
             Dim codecformat As WMStreamConfig
             Dim mediatype As MediaType
             Dim vih As VideoInfoHeader
             Dim candidate As Boolean
             Dim candidatevih As VideoInfoHeader = New VideoInfoHeader()
             Dim candidatemt As MediaType = Nothing
             Dim mt As MediaType = Nothing
             Dim candidatestream As WMStreamConfig = Nothing

             Dim added As Boolean = False
             Dim viharr As Byte() = New Byte(87) {}
             candidate = False
             Dim codecs As Integer = manager.GetCodecInfoCount(Leadtools.Multimedia.Constants.MEDIATYPE_Video)

             Dim sinfo As String = String.Empty
             '  search for matching codec
             Dim codecindex As Integer = 0
             Do While codecindex < codecs
                 sinfo &= manager.GetCodecName(Leadtools.Multimedia.Constants.MEDIATYPE_Video, codecindex)
                 Dim formats As Integer = manager.GetCodecFormatCount(Leadtools.Multimedia.Constants.MEDIATYPE_Video, codecindex)

                 Dim formatindex As Integer = 0
                 Do While formatindex < formats
                     sinfo &= manager.GetCodecFormatDesc(Leadtools.Multimedia.Constants.MEDIATYPE_Video, codecindex, formatindex)
                     codecformat = manager.GetCodecFormat(Leadtools.Multimedia.Constants.MEDIATYPE_Video, codecindex, formatindex)
                     mediatype = codecformat.GetMediaType()

                     If mediatype.FormatType = Leadtools.Multimedia.Constants.FORMAT_VideoInfo Then
                         vih = mediatype.GetVideoFormatData()
                         If vih.bmiHeader.biCompression = fourcc Then
                             candidate = True
                             candidatevih = vih
                             candidatemt = mediatype
                             candidatestream = codecformat
                         End If
                     End If
                     formatindex += 1
                 Loop
                 codecindex += 1
             Loop
             If candidate Then
                 '  modify the selected codec to support this bitrate and size
                 candidatevih.dwBitRate = bitrate
                 candidatevih.rcSource.Right = width
                 candidatevih.rcSource.Bottom = height
                 candidatevih.rcTarget.Right = width
                 candidatevih.rcTarget.Bottom = height
                 candidatevih.bmiHeader.biWidth = width
                 candidatevih.bmiHeader.biHeight = height
                 candidatevih.AvgTimePerFrame.lowpart = CInt((10000000 / fps) Mod 65536)
                 candidatevih.AvgTimePerFrame.highpart = CInt((10000000 / fps) / 65536)

                 StructToByteArray(candidatevih, viharr)

                 candidatestream.Quality = quality
                 candidatestream.MaxKeyFrameSpacing = secperkey
                 candidatestream.StreamNumber = streamnum
                 candidatestream.StreamName = "Video Stream"
                 candidatestream.ConnectionName = "Video"
                 candidatestream.Bitrate = bitrate
                 candidatestream.SetMediaType(candidatemt)
                 profile.AddStream(candidatestream)
                 added = True
             End If
             Return added
         End Function

         Private Function AddAudioStream(ByVal manager As WMProfileManager, _
                                         ByVal profile As WMProfile, _
                                         ByVal streamnum As Integer, _
                                         ByVal formattag As Integer, _
                                         ByVal prefbitrate As Integer, _
                                         ByVal samplespersec As Integer, _
                                         ByVal channels As Integer, _
                                         ByVal withvideo As Boolean) As Boolean
             Dim codecformat As WMStreamConfig
             Dim mediatype As MediaType
             Dim wfex As WaveFormatEx = New WaveFormatEx()
             Dim added As Boolean = False
             Dim candidate As Boolean
             Dim candidatewfex As WaveFormatEx = New WaveFormatEx()
             Dim candidatemt As MediaType = Nothing
             Dim mt As MediaType
             Dim stream As WMStreamConfig
             candidate = False
             Dim codecs As Integer = manager.GetCodecInfoCount(Leadtools.Multimedia.Constants.MEDIATYPE_Audio)

             '  search for matching codec
             Dim codecindex As Integer = 0
             Do While codecindex < codecs
                 Dim formats As Integer = manager.GetCodecFormatCount(Leadtools.Multimedia.Constants.MEDIATYPE_Audio, codecindex)
                 Dim formatindex As Integer = 0
                 Do While formatindex < formats
                     codecformat = manager.GetCodecFormat(Leadtools.Multimedia.Constants.MEDIATYPE_Audio, codecindex, formatindex)
                     mediatype = codecformat.GetMediaType()
                     If mediatype.FormatType = Leadtools.Multimedia.Constants.FORMAT_WaveFormatEx Then
                         ByteArrayToStruct(mediatype.Format, wfex)

                         Dim diff As Integer = ((wfex.nAvgBytesPerSec * 8) - prefbitrate)
                         If diff < 250 AndAlso diff > -250 AndAlso wfex.nSamplesPerSec = samplespersec _
                             AndAlso wfex.nChannels = channels AndAlso wfex.wFormatTag = formattag Then
                             If candidate Then
                                 If withvideo Then
                                     ' 
                                     '  For audio/video configurations, we want to
                                     '  find the smaller blockalign. In this case, 
                                     '  the blockalign is larger, so we want to
                                     '  use the old format. 
                                     If wfex.nBlockAlign <= candidatewfex.nBlockAlign Then
                                         candidatewfex = wfex
                                         candidatemt = mediatype
                                     End If
                                 ElseIf wfex.nBlockAlign >= candidatewfex.nBlockAlign Then
                                     candidatewfex = wfex
                                     candidatemt = mediatype
                                 End If
                             Else
                                 candidate = True
                                 candidatewfex = wfex
                                 candidatemt = mediatype
                             End If
                         End If
                     End If
                     formatindex += 1
                 Loop
                 codecindex += 1
             Loop

             If candidate Then
                 '  modify the selected codec to support this bitrate and format
                 mt = New MediaType()
                 mt.Type = Leadtools.Multimedia.Constants.MEDIATYPE_Audio
                 mt.SubType = "{" & String.Format("{0:X8}", formattag) & "-0000-0010-8000-00AA00389B71}"
                 mt.FixedSizeSamples = True
                 mt.TemporalCompression = False
                 mt.SampleSize = candidatewfex.nBlockAlign
                 mt.FormatType = Leadtools.Multimedia.Constants.FORMAT_WaveFormatEx
                 mt.SetFormatData(-1, candidatemt.Format)
                 stream = profile.CreateNewStream(Leadtools.Multimedia.Constants.MEDIATYPE_Audio)
                 stream.StreamNumber = streamnum
                 stream.StreamName = "Audio Stream"
                 stream.ConnectionName = "Audio"
                 stream.Bitrate = (candidatewfex.nAvgBytesPerSec * 8)
                 stream.SetMediaType(mt)
                 profile.AddStream(stream)
                 profile.ReconfigStream(stream)
                 added = True
             End If

             Return added
         End Function

      Private Sub StructToByteArray(ByVal o As Object, ByRef dest As Byte())
         Try
            'convert the structure to a byte array
            Dim rawSize As Integer = Marshal.SizeOf(o)
            Dim handle As GCHandle = New GCHandle()
            Dim buffer As IntPtr

            handle = GCHandle.Alloc(dest, GCHandleType.Pinned)
            buffer = handle.AddrOfPinnedObject()
            Marshal.StructureToPtr(o, buffer, False)
            handle.Free()
         Catch ex As Exception
            Throw ex
         End Try
      End Sub

      Private Sub ByteArrayToStruct(ByVal buffer As Object, ByRef vih As WaveFormatEx)
         Try
            Dim handle As GCHandle = New GCHandle()

            'convert the structure to a byte array
            handle = GCHandle.Alloc(buffer, GCHandleType.Pinned)
            Dim ptr As IntPtr = handle.AddrOfPinnedObject()
            vih = CType(Marshal.PtrToStructure(ptr, GetType(WaveFormatEx)), WaveFormatEx)
            handle.Free()
         Catch ex As Exception
            Throw ex
         End Try
      End Sub

         Private Function AddMutexObject(ByVal profile As WMProfile, _
                                         ByVal basestream As Integer, _
                                         ByVal streamcount As Integer) As Boolean
             Dim excl As WMMutualExclusion = profile.CreateNewMutualExclusion()

             '  indicate that the streams differ by bit rate
             excl.Type = "{D6E22A01-35DA-11D1-9034-00A0C90349BE}"
             Dim i As Integer = 0
             Do While i < streamcount
                 excl.AddStream(basestream + i)
                 i += 1
             Loop

             '  assign the exclusion object to the profile
             profile.AddMutualExclusion(excl)
             Return True
         End Function

         Private Function RemoveMutexObject(ByVal profile As WMProfile, _
                                            ByVal excl As WMMutualExclusion, _
                                            ByVal basestream As Integer, _
                                            ByVal streamcount As Integer) As Boolean
             '  indicate that the streams differ by bit rate
             excl.Type = "{D6E22A01-35DA-11D1-9034-00A0C90349BE}"
             Dim i As Integer = 0
             Do While i < streamcount
                 excl.RemoveStream(basestream + i)
                 i += 1
             Loop

             '  remove the exclusion object from the profile
             profile.RemoveMutualExclusion(excl)
             Return True
         End Function

Public NotInheritable Class LEAD_VARS
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media";
End Class