Grabar video de webcam en VB.NET: Guía completa¶

Imports System.IO
Imports VisioForge.Core
Imports VisioForge.Core.VideoCaptureX
Imports VisioForge.Core.Types.X.Sources
Imports VisioForge.Core.Types.X.Output
Imports VisioForge.Core.Types.X.AudioRenderers

Public Class Form1
    Private VideoCapture1 As VideoCaptureCoreX

    Private Async Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ' Inicializar el SDK
        Await VisioForgeX.InitSDKAsync()

        ' Crear el motor de captura de video
        VideoCapture1 = New VideoCaptureCoreX(VideoView1)
        AddHandler VideoCapture1.OnError, AddressOf VideoCapture1_OnError

        ' Enumerar fuentes de video (webcams)
        Dim videoSources = Await DeviceEnumerator.Shared.VideoSourcesAsync()
        For Each source In videoSources
            cbVideoInputDevice.Items.Add(source.DisplayName)
            If cbVideoInputDevice.Items.Count = 1 Then cbVideoInputDevice.SelectedIndex = 0
        Next

        ' Enumerar fuentes de audio (micrófonos)
        Dim audioSources = Await DeviceEnumerator.Shared.AudioSourcesAsync()
        For Each source In audioSources
            cbAudioInputDevice.Items.Add(source.DisplayName)
            If cbAudioInputDevice.Items.Count = 1 Then cbAudioInputDevice.SelectedIndex = 0
        Next

        ' Enumerar salidas de audio (altavoces)
        Dim audioOutputs = Await DeviceEnumerator.Shared.AudioOutputsAsync()
        For Each audioOutput In audioOutputs
            cbAudioOutputDevice.Items.Add(audioOutput.DisplayName)
            If cbAudioOutputDevice.Items.Count = 1 Then cbAudioOutputDevice.SelectedIndex = 0
        Next

        edOutput.Text = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.MyVideos), "capture.mp4")
    End Sub

    Private Async Sub cbVideoInputDevice_SelectedIndexChanged(
            sender As Object, e As EventArgs) Handles cbVideoInputDevice.SelectedIndexChanged

        If cbVideoInputDevice.SelectedIndex = -1 Then Return

        cbVideoInputFormat.Items.Clear()
        cbVideoInputFrameRate.Items.Clear()

        Dim videoSources = Await DeviceEnumerator.Shared.VideoSourcesAsync()
        Dim device = videoSources.FirstOrDefault(
            Function(d) d.DisplayName = cbVideoInputDevice.Text)

        If device IsNot Nothing Then
            For Each videoFormat In device.VideoFormats
                cbVideoInputFormat.Items.Add(videoFormat.Name)
            Next
            If cbVideoInputFormat.Items.Count > 0 Then cbVideoInputFormat.SelectedIndex = 0
        End If
    End Sub

    Private Async Sub btStart_Click(sender As Object, e As EventArgs) Handles btStart.Click
        Try
            ' Configurar fuente de video
            Dim videoSources = Await DeviceEnumerator.Shared.VideoSourcesAsync()
            Dim videoDevice = videoSources.FirstOrDefault(
                Function(d) d.DisplayName = cbVideoInputDevice.Text)

            If videoDevice IsNot Nothing Then
                Dim videoSourceSettings As New VideoCaptureDeviceSourceSettings(videoDevice)
                VideoCapture1.Video_Source = videoSourceSettings
            End If

            ' Configurar fuente de audio
            Dim audioSources = Await DeviceEnumerator.Shared.AudioSourcesAsync()
            Dim audioDevice = audioSources.FirstOrDefault(
                Function(d) d.DisplayName = cbAudioInputDevice.Text)

            If audioDevice IsNot Nothing Then
                VideoCapture1.Audio_Source = audioDevice.CreateSourceSettingsVC(Nothing)
            End If

            ' Configurar salida de audio para monitoreo en vivo
            Dim audioOutputs = Await DeviceEnumerator.Shared.AudioOutputsAsync()
            Dim audioOutput = audioOutputs.FirstOrDefault(
                Function(d) d.DisplayName = cbAudioOutputDevice.Text)

            If audioOutput IsNot Nothing Then
                VideoCapture1.Audio_OutputDevice = New AudioRendererSettings(audioOutput)
            End If

            VideoCapture1.Audio_Play = True
            VideoCapture1.Audio_Record = True
            VideoCapture1.Video_Play = True

            ' Configurar salida MP4
            VideoCapture1.Outputs_Clear()
            VideoCapture1.Outputs_Add(New MP4Output(edOutput.Text), True)

            ' Iniciar grabación
            Await VideoCapture1.StartAsync()
        Catch ex As Exception
            MessageBox.Show(Me, ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
    End Sub

    Private Async Sub btStop_Click(sender As Object, e As EventArgs) Handles btStop.Click
        Try
            Await VideoCapture1.StopAsync()
        Catch ex As Exception
            MessageBox.Show(Me, ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try
    End Sub

    Private Async Sub btSaveScreenshot_Click(sender As Object, e As EventArgs) Handles btSaveScreenshot.Click
        Dim saveDialog As New SaveFileDialog With {
            .Filter = "JPEG|*.jpg|PNG|*.png|BMP|*.bmp",
            .FileName = "snapshot.jpg"
        }

        If saveDialog.ShowDialog() = DialogResult.OK Then
            Dim format As SKEncodedImageFormat = SKEncodedImageFormat.Jpeg
            If saveDialog.FileName.EndsWith(".png", StringComparison.OrdinalIgnoreCase) Then
                format = SKEncodedImageFormat.Png
            End If

            Await VideoCapture1.Snapshot_SaveAsync(saveDialog.FileName, format)
        End If
    End Sub

    Private Async Sub Form1_FormClosing(
            sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing

        If VideoCapture1 IsNot Nothing Then
            Await VideoCapture1.DisposeAsync()
            VideoCapture1 = Nothing
        End If

        VisioForgeX.DestroySDK()
    End Sub

    Private Sub VideoCapture1_OnError(sender As Object, e As ErrorsEventArgs)
        If Me.InvokeRequired Then
            Me.Invoke(Sub() mmLog.Text &= e.Message & Environment.NewLine)
        Else
            mmLog.Text &= e.Message & Environment.NewLine
        End If
    End Sub
End Class

' Sin salida agregada - solo vista previa
VideoCapture1.Video_Play = True
VideoCapture1.Audio_Play = True

Await VideoCapture1.StartAsync()

VideoCapture1.Outputs_Add(New WebMOutput(edOutput.Text), True)

VideoCapture1.Outputs_Add(New AVIOutput(edOutput.Text), True)