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DirectShow フィルターを使用して、オーディオをある形式から別の形式に変換および圧縮してきました。GraphStudio と GraphStudioNext を使用してフィルター グラフを作成し、それを VB.Net のフィルターに変換します。彼らは今まで常に素晴らしい仕事をしてきました。.wav ファイルを .mp3 に変換しようとしています。GraphStudio と、デフォルトの接続でチェーン化された次のフィルターを使用して、圧縮ファイルを取得します。FileSource-Async -->WaveParser -->MPEG Layer3 --> WAV Dest --> Filewriter.

ただし、VB.Net プログラムで同じフィルターを接続すると、まったく圧縮されません。IAMStreamConfig インターフェイスを使用して圧縮を設定しようとしましたが、プログラムでピンを列挙すると、GraphStudio に表示される圧縮は利用できません。関数（いくつかのコメントを含む）は以下のとおりです。ご意見、ご提案は大歓迎です。

Private Function PlayInitMP3(ByVal path As String, ByVal dstPath As String) As Integer

    Dim asyncReader As DirectShowNET.IBaseFilter = Nothing
    Dim WaveParser As DirectShowNET.IBaseFilter = Nothing
    'Dim ACMWrapper As DirectShowNET.IBaseFilter = Nothing
    Dim MPEG3Wrapper As DirectShowNET.IBaseFilter = Nothing
    Dim WavDestWrapper As DirectShowNET.IBaseFilter = Nothing

    Dim fileSource As DirectShowNET.IFileSourceFilter = Nothing
    Dim fileDestination As DirectShowNET.IBaseFilter = Nothing




    Dim result As Integer = -1
    Dim srcFileInfo As System.IO.FileInfo = New FileInfo(path)

    Service1.nlog.LogError(0, "Starting Init", "", "")

    'Set to Null Renderer
    Try
        result = WaveParser.SetSyncSource(DBNull.Value)
        Marshal.ThrowExceptionForHR(result)
        Service1.nlog.LogError(0, "SetSyncSource-WaveParser", result.ToString, "")

        'result = ACMWrapper.SetSyncSource(DBNull.Value)
        'Marshal.ThrowExceptionForHR(result)
        'Service1.nlog.LogError(0, "SetSyncSource-ACMWrapper", result.ToString, "")

        result = MPEG3Wrapper.SetSyncSource(DBNull.Value)
        Marshal.ThrowExceptionForHR(result)
        Service1.nlog.LogError(0, "SetSyncSource-MPEG3Wrapper", result.ToString, "")

        result = WavDestWrapper.SetSyncSource(DBNull.Value)
        Marshal.ThrowExceptionForHR(result)
        Service1.nlog.LogError(0, "SetSyncSource-WavDestWrapper", result.ToString, "")

    Catch ex As Exception

    End Try


    Try

        If IsNothing(Me.graphBuilder) = False Then
            Marshal.ReleaseComObject(Me.mediaSeeking)
            Marshal.ReleaseComObject(Me.mediaControl)
            Marshal.ReleaseComObject(Me.graphBuilder)

            Me.mediaSeeking = Nothing
            Me.mediaControl = Nothing
            Me.graphBuilder = Nothing

        End If

        ' Create IGraphBuilder instance
        Me.graphBuilder = New DirectShowNET.FilterGraph()


        ' Create MediaControl

        ' File source filter addition
        asyncReader = New DirectShowNET.AsyncReader
        result = graphBuilder.AddFilter(asyncReader, System.IO.Path.GetFileName(path))
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "SourceFilter", result.ToString, "")

        ' Add Wave Parser
        WaveParser = New DirectShowNET.WaveParser
        result = Me.graphBuilder.AddFilter(WaveParser, "Wave Parser")
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "WaveParser", result.ToString, "")

        '' Add ACMWrapper
        'ACMWrapper = New DirectShowNET.ACMWrapper
        'result = Me.graphBuilder.AddFilter(ACMWrapper, "ACMWrapper Parser")
        'Marshal.ThrowExceptionForHR(result)

        'Service1.nlog.LogError(0, "ACMWrapper", result.ToString, "")

        ' Add MPEG3Wrapper
        MPEG3Wrapper = New DirectShowNET.MPEG3Layer
        result = Me.graphBuilder.AddFilter(MPEG3Wrapper, "MPEG3Layer Parser")
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "MPEG3Wrapper", result.ToString, "")


        ' Add WAVDest
        WavDestWrapper = New DirectShowNET.WaveDestination
        result = Me.graphBuilder.AddFilter(WavDestWrapper, "WaveDestination")
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "WaveDestination", result.ToString, "")


        ' FileWriter filter addition
        fileDestination = New DirectShowLib.FileWriter
        Dim fs As DirectShowLib.IFileSinkFilter = DirectCast(fileDestination, DirectShowLib.IFileSinkFilter)
        result = fs.SetFileName(dstPath, Nothing)
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "FileWriter", result.ToString, "")

        result = Me.graphBuilder.AddFilter(DirectCast(fileDestination, DirectShowNET.IBaseFilter), "Filewriter")
        Marshal.ThrowExceptionForHR(result)



        ' Set the Filename using the IFileSinkFilter interface

        ' The file is loaded. 
        fileSource = asyncReader
        result = fileSource.Load(path, Nothing)
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "SourceFileLoad", result.ToString, "")

        ' Wave Parser is connected with FileSourceFilter.
        Try
            result = ConnectFilters(Me.graphBuilder, asyncReader, WaveParser)
            Marshal.ThrowExceptionForHR(result)
        Catch ex As Exception
            Service1.nlog.LogError(0, "ConnectWaveParser", ex.Message, "")
        End Try

        Service1.nlog.LogError(0, "WaveParser Result", result.ToString, "")

        ' Wave Parser is connected with MPEG3.
        Try
            result = ConnectFilters(Me.graphBuilder, WaveParser, MPEG3Wrapper)
            Marshal.ThrowExceptionForHR(result)
        Catch ex As Exception
            Service1.nlog.LogError(0, "ConnectWaveParser", ex.Message, "")
        End Try

        Service1.nlog.LogError(0, "WaveParser Result", result.ToString, "")
        '' ACMParser is connected with WaveParser.
        'Try
        '    result = ConnectFilters(Me.graphBuilder, WaveParser, ACMWrapper)
        '    Marshal.ThrowExceptionForHR(result)
        'Catch ex As Exception
        '    Service1.nlog.LogError(0, "ConnectACMWrapper", ex.Message, "")
        'End Try

        'Service1.nlog.LogError(0, "ACMWrapper Result", result.ToString, "")

        ''COMPRESSION
        'Try
        '    'Configure the Compression Stream Variables
        '    Dim NewConfig As IAMStreamConfig
        '    Dim mp3Pin As IPin
        '    Dim ppEnum As IEnumPins
        '    Dim aPin(1) As IPin
        '    Dim dPin As PinDirection = PinDirection.Output
        '    Dim nPin As Integer


        '    Service1.nlog.LogError(0, "Beginning ACMWrapper Compression", "", "")
        '    ACMWrapper.EnumPins(ppEnum)
        '    While ppEnum.Next(1, aPin, nPin) = 0
        '        mp3Pin = aPin(0)
        '        mp3Pin.QueryDirection(dPin)
        '        If dPin = PinDirection.Output Then
        '            Exit While
        '        End If
        '    End While


        '    NewConfig = TryCast(mp3Pin, IAMStreamConfig)
        '    If NewConfig Is Nothing Then
        '        Service1.nlog.LogError(0, "NewConfig Is nothing", "", "")

        '    End If
        '    Service1.nlog.LogError(0, "After TryCast", "", "")

        '    Dim nCap As Integer
        '    Dim sCap As Integer
        '    Dim pmt As New DirectShowLib.AMMediaType
        '    Service1.nlog.LogError(0, "After pmt", "", "")

        '    NewConfig.GetNumberOfCapabilities(nCap, sCap)
        '    Dim i As Integer
        '    Dim sArray(sCap) As System.IntPtr
        '    Dim intPtr As IntPtr = Marshal.AllocCoTaskMem(sCap)

        '    Dim audioFormatACM As WaveFormatEx

        '    For i = 0 To nCap - 1
        '        NewConfig.GetStreamCaps(i, pmt, intPtr)

        '        audioFormatACM = New WaveFormatEx()

        '        Marshal.PtrToStructure(pmt.formatPtr, audioFormatACM)
        '        'Print Audio Format
        '        Service1.nlog.LogError(0, "Index:", i.ToString, "")
        '        Service1.nlog.LogError(0, "AudioFormat:BitsPerSample", audioFormatACM.wBitsPerSample.ToString, "")
        '        Service1.nlog.LogError(0, "AudioFormat:nSamplesPerSec", audioFormatACM.nSamplesPerSec.ToString, "")
        '        Service1.nlog.LogError(0, "AudioFormat:AvgBytesPerSec", audioFormatACM.nAvgBytesPerSec.ToString, "")

        '        ''Once find the proper format then save it and exit
        '        If audioFormatACM.nAvgBytesPerSec = 8000 AndAlso audioFormatACM.nSamplesPerSec = 8000 Then
        '            'audioFormatACM.nAvgBytesPerSec = 8000
        '            'audioFormatACM.wBitsPerSample = 8
        '            'audioFormatACM.nSamplesPerSec = 8000
        '            Marshal.StructureToPtr(audioFormatACM, pmt.formatPtr, True)
        '            Exit For
        '        End If
        '    Next

        '    'Use Selected format from enum to set

        '    If NewConfig.SetFormat(pmt) <> 0 Then
        '        Service1.nlog.LogError(0, "ACM Setformat Error", "", "")
        '    End If

        '    'See if Successfully Set

        '    audioFormatACM = New WaveFormatEx()

        '    Marshal.PtrToStructure(pmt.formatPtr, audioFormatACM)

        '    If NewConfig.GetFormat(pmt) <> 0 Then
        '        Service1.nlog.LogError(0, "ACM GetFormat Error", "", "")
        '    End If
        '    Service1.nlog.LogError(0, "ACM Updated AvgBytesPerSec", audioFormatACM.nAvgBytesPerSec.ToString, "")
        '    Service1.nlog.LogError(0, "ACM Updated SamplesPerSec", audioFormatACM.nSamplesPerSec.ToString, "")

        '    'Release Memory

        'Catch ex As Exception
        '    Service1.nlog.LogError(0, "Compression Error:", ex.Message, ex.Source)

        'End Try

        '' WaveParser is connected with MPEG3.
        'Try
        '    result = ConnectFilters(Me.graphBuilder, ACMWrapper, MPEG3Wrapper)
        '    Marshal.ThrowExceptionForHR(result)
        'Catch ex As Exception
        '    Service1.nlog.LogError(0, "Connect MPEG3Wrapper", ex.Message, "")
        'End Try

        'Service1.nlog.LogError(0, "MPEG3Wrapper Result", result.ToString, "")

        'COMPRESSION
        Try
            'Configure the Compression Stream Variables
            Dim NewConfig1 As IAMStreamConfig
            Dim mp3Pin1 As IPin
            Dim ppEnum1 As IEnumPins
            Dim aPin1(1) As IPin
            Dim dPin1 As PinDirection = PinDirection.Output
            Dim nPin1 As Integer

            MPEG3Wrapper.EnumPins(ppEnum1)
            While ppEnum1.Next(1, aPin1, nPin1) = 0
                mp3Pin1 = aPin1(0)
                mp3Pin1.QueryDirection(dPin1)
                If dPin1 = PinDirection.Output Then
                    Exit While
                End If
            End While


            NewConfig1 = TryCast(mp3Pin1, IAMStreamConfig)
            If NewConfig1 Is Nothing Then
                Service1.nlog.LogError(0, "NewConfig Is nothing", "", "")

            End If
            Service1.nlog.LogError(0, "After TryCast", "", "")

            Dim nCap1 As Integer
            Dim sCap1 As Integer
            Dim pmt1 As New DirectShowLib.AMMediaType
            Service1.nlog.LogError(0, "After pmt", "", "")

            NewConfig1.GetNumberOfCapabilities(nCap1, sCap1)
            Dim i As Integer
            Dim sArray1(sCap1) As System.IntPtr
            Dim intPtr1 As IntPtr = Marshal.AllocCoTaskMem(sCap1)

            Dim audioFormat As MPEGLAYER3WAVEFORMAT

            For i = 0 To nCap1 - 1
                NewConfig1.GetStreamCaps(i, pmt1, intPtr1)

                audioFormat = New MPEGLAYER3WAVEFORMAT()

                Marshal.PtrToStructure(pmt1.formatPtr, audioFormat)
                'Print Audio Format
                Service1.nlog.LogError(0, "Index:", i.ToString, "")
                Service1.nlog.LogError(0, "AudioFormat:BitsPerSample", audioFormat.wfx.wBitsPerSample.ToString, "")
                Service1.nlog.LogError(0, "AudioFormat:nSamplesPerSec", audioFormat.wfx.nSamplesPerSec.ToString, "")
                Service1.nlog.LogError(0, "AudioFormat:AvgBytesPerSec", audioFormat.wfx.nAvgBytesPerSec.ToString, "")

                'Once find the proper format then save it and exit
                'If audioFormat.wfx.nAvgBytesPerSec = 8000 AndAlso audioFormat.wfx.wBitsPerSample = 8 Then
                '    audioFormat.wfx.nAvgBytesPerSec = 8000
                '    'audioFormat.wfx.wBitsPerSample = 8
                '    'audioFormat.wfx.wFormatTag = 85
                '    'audioFormat.wfx.nSamplesPerSec = 1000
                '    Service1.nlog.LogError(0, "MP3 Selected Format AvgBytesPerSec", audioFormat.wfx.nSamplesPerSec.ToString, "")
                '    Marshal.StructureToPtr(audioFormat, pmt1.formatPtr, True)
                '    Exit For
                'End If
            Next

            'Use Selected format from enum to set

            'If NewConfig1.SetFormat(pmt1) <> 0 Then
            '    Service1.nlog.LogError(0, "Setformat Error:", NewConfig1.SetFormat(pmt1).ToString, "")
            'End If

            'See if Successfully Set

            audioFormat = New MPEGLAYER3WAVEFORMAT()
            pmt1 = New AMMediaType

            If NewConfig1.GetFormat(pmt1) <> 0 Then
                Service1.nlog.LogError(0, "GetFormat Error", "", "")
            End If

            Marshal.PtrToStructure(pmt1.formatPtr, audioFormat)
            Service1.nlog.LogError(0, "Updated AvgBytesPerSec", audioFormat.wfx.nAvgBytesPerSec.ToString, "")
            Service1.nlog.LogError(0, "Updated SamplesPerSec", audioFormat.wfx.nSamplesPerSec.ToString, "")
            Service1.nlog.LogError(0, "Updated FormatTag", audioFormat.wfx.wFormatTag.ToString, "")

        Catch ex As Exception
            Service1.nlog.LogError(0, "Compression Error:", ex.Message, ex.Source)

        End Try


        ' MPEG3 is connected with WavDest.
        Try
            result = ConnectFilters(Me.graphBuilder, MPEG3Wrapper, WavDestWrapper)
            Marshal.ThrowExceptionForHR(result)
        Catch ex As Exception
            Service1.nlog.LogError(0, "Connect WavDestWrapper", ex.Message, "")
        End Try

        Service1.nlog.LogError(0, "WaveDestWrapper Result", result.ToString, "")


        ' Connect to the File Writer 
        result = ConnectFilters(Me.graphBuilder, WavDestWrapper, fileDestination)
        Marshal.ThrowExceptionForHR(result)

        Service1.nlog.LogError(0, "ConnectFileWriter", result.ToString, "")



        'Actually Write The File

        ' The IMediaSeeking interface is acquired.
        Me.mediaSeeking = Me.graphBuilder
        Me.mediaSeeking.GetDuration(Me.duration)
        Me.duration /= DSS_MEDIA_TIME   ' MEDIA_TIME to Millisecond
        Service1.nlog.LogError(0, "Duration=", Me.duration.ToString, "")


    Catch ex As Exception

        Marshal.ReleaseComObject(Me.graphBuilder)
        Me.graphBuilder = Nothing
        Service1.nlog.LogError(0, "Exception MP3Convert", ex.Message, "")
    Finally

        asyncReader = Nothing
        WaveParser = Nothing
        'ACMWrapper = Nothing
        MPEG3Wrapper = Nothing
        WavDestWrapper = Nothing
        fileSource = Nothing
        fileDestination = Nothing

    End Try

        Service1.nlog.LogError(0, "Ending Init MP3", " Result:", result.ToString)

        Return result

End Function
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1 に答える 1

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多くの調査の結果、グラフエディットのように圧縮を機能させることができませんでした。そこで、プロジェクトを完全に変更し、ラメ エンコーダーを使用して変換を行うことにしました。ごくわずかなコードで完全に機能します。新しいコードは次のとおりです。

Private Function PlayInitMP3(ByVal WaveFile As String, ByVal MP3File As String) As Integer
    Try
        'Convert WAV to MP3 using Lame
        Dim WaveFileInfo As New FileInfo(WaveFile)
        Dim MP3FileInfo As New FileInfo(MP3File)
        Dim strLameLine As String
        Dim LameExe As String = ConfigurationManager.AppSettings("LameExe") '"C:\scribe\lame\lame.exe -h"
        Dim sBlank As String = " "
        Dim waitTime As Integer = System.Convert.ToInt16(ConfigurationManager.AppSettings("LameWait")) '-1

        strLameLine = LameExe & sBlank & WaveFileInfo.FullName & sBlank & MP3FileInfo.FullName

        Shell(strLameLine, AppWinStyle.Hide, True, waitTime)

        'Debug
        Service1.nlog.LogError(0, WaveFileInfo.Name, strLameLine, "LAME MP3 Conversion Complete")

    Catch ex As Exception

    End Try

End Function
于 2013-03-19T00:28:08.513 に答える