GStreamer-Basic-WHIP-GUI

GStreamer-Basic-WHIP-GUI.ps1

#requires -Version 5.1
<#
.SYNOPSIS
    Minimal Windows GUI wrapper for a low-latency GStreamer WHIP desktop stream.

.DESCRIPTION
    Uses the proven pipeline:
      D3D11 desktop capture -> D3D11 conversion -> NVENC H.264 -> WHIP
    Optional audio paths:
      Windows desktop loopback -> Opus
      Default microphone -> Opus
      Desktop + microphone -> audiomixer -> Opus

    The GUI launches gst-launch-1.0.exe as a separate process. Stop/Restart kills
    the complete process tree so capture, encoder, clocks, and WHIP state are rebuilt.
#>

Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
[System.Windows.Forms.Application]::EnableVisualStyles()

$script:AppName = 'GStreamer Basic WHIP Streamer'
$script:ConfigDirectory = Join-Path $env:APPDATA 'GStreamerBasicWhipStreamer'
$script:ConfigPath = Join-Path $script:ConfigDirectory 'settings.json'
$script:LogDirectory = Join-Path $env:LOCALAPPDATA 'GStreamerBasicWhipStreamer\Logs'

$script:GstProcess = $null
$script:StopRequested = $false
$script:RestartAt = $null
$script:StdOutPath = $null
$script:StdErrPath = $null
$script:StdOutPosition = [int64]0
$script:StdErrPosition = [int64]0

function Find-GstLaunch {
    $command = Get-Command 'gst-launch-1.0.exe' -ErrorAction SilentlyContinue
    if ($command) {
        return $command.Source
    }

    $candidates = @(
        (Join-Path $env:ProgramFiles 'gstreamer\1.0\msvc_x86_64\bin\gst-launch-1.0.exe'),
        (Join-Path $env:ProgramFiles 'gstreamer\1.0\mingw_x86_64\bin\gst-launch-1.0.exe'),
        (Join-Path ${env:ProgramFiles(x86)} 'gstreamer\1.0\msvc_x86_64\bin\gst-launch-1.0.exe'),
        (Join-Path ${env:ProgramFiles(x86)} 'gstreamer\1.0\mingw_x86_64\bin\gst-launch-1.0.exe')
    )

    foreach ($candidate in $candidates) {
        if ($candidate -and (Test-Path -LiteralPath $candidate)) {
            return $candidate
        }
    }

    return ''
}

function Format-InvariantNumber {
    param(
        [Parameter(Mandatory)]
        [double]$Value,

        [string]$Format = '0.00'
    )

    return $Value.ToString($Format, [System.Globalization.CultureInfo]::InvariantCulture)
}

function Quote-GstValue {
    param([Parameter(Mandatory)][string]$Value)

    $escaped = $Value.Replace('\', '\\').Replace('"', '\"')
    return '"' + $escaped + '"'
}

function Read-NewLogText {
    param(
        [string]$Path,
        [ref]$Position
    )

    if ([string]::IsNullOrWhiteSpace($Path) -or -not (Test-Path -LiteralPath $Path)) {
        return ''
    }

    try {
        $stream = New-Object System.IO.FileStream(
            $Path,
            [System.IO.FileMode]::Open,
            [System.IO.FileAccess]::Read,
            [System.IO.FileShare]::ReadWrite
        )

        try {
            if ($Position.Value -gt $stream.Length) {
                $Position.Value = [int64]0
            }

            $null = $stream.Seek($Position.Value, [System.IO.SeekOrigin]::Begin)
            $reader = New-Object System.IO.StreamReader($stream)
            try {
                $text = $reader.ReadToEnd()
                $Position.Value = $stream.Position
                return $text
            }
            finally {
                $reader.Dispose()
            }
        }
        finally {
            $stream.Dispose()
        }
    }
    catch {
        return ''
    }
}

$form = New-Object System.Windows.Forms.Form
$form.Text = $script:AppName
$form.StartPosition = 'CenterScreen'
$form.Size = New-Object System.Drawing.Size(930, 790)
$form.MinimumSize = New-Object System.Drawing.Size(850, 700)
$form.Font = New-Object System.Drawing.Font('Segoe UI', 9)

$toolTip = New-Object System.Windows.Forms.ToolTip
$toolTip.AutoPopDelay = 12000
$toolTip.InitialDelay = 400
$toolTip.ReshowDelay = 100

$settingsGroup = New-Object System.Windows.Forms.GroupBox
$settingsGroup.Text = 'Stream Settings'
$settingsGroup.Location = New-Object System.Drawing.Point(10, 10)
$settingsGroup.Size = New-Object System.Drawing.Size(895, 315)
$settingsGroup.Anchor = 'Top,Left,Right'
$form.Controls.Add($settingsGroup)

function Add-Label {
    param(
        [System.Windows.Forms.Control]$Parent,
        [string]$Text,
        [int]$X,
        [int]$Y,
        [int]$Width = 120
    )

    $label = New-Object System.Windows.Forms.Label
    $label.Text = $Text
    $label.Location = New-Object System.Drawing.Point($X, $Y)
    $label.Size = New-Object System.Drawing.Size($Width, 22)
    $label.TextAlign = 'MiddleLeft'
    $Parent.Controls.Add($label)
    return $label
}

$null = Add-Label $settingsGroup 'GStreamer executable' 15 25 130
$txtGstPath = New-Object System.Windows.Forms.TextBox
$txtGstPath.Location = New-Object System.Drawing.Point(150, 25)
$txtGstPath.Size = New-Object System.Drawing.Size(575, 23)
$txtGstPath.Anchor = 'Top,Left,Right'
$txtGstPath.Text = Find-GstLaunch
$settingsGroup.Controls.Add($txtGstPath)

$btnBrowseGst = New-Object System.Windows.Forms.Button
$btnBrowseGst.Text = 'Browse...'
$btnBrowseGst.Location = New-Object System.Drawing.Point(735, 23)
$btnBrowseGst.Size = New-Object System.Drawing.Size(70, 27)
$btnBrowseGst.Anchor = 'Top,Right'
$settingsGroup.Controls.Add($btnBrowseGst)

$btnCheckGst = New-Object System.Windows.Forms.Button
$btnCheckGst.Text = 'Check'
$btnCheckGst.Location = New-Object System.Drawing.Point(810, 23)
$btnCheckGst.Size = New-Object System.Drawing.Size(65, 27)
$btnCheckGst.Anchor = 'Top,Right'
$settingsGroup.Controls.Add($btnCheckGst)

$null = Add-Label $settingsGroup 'WHIP endpoint' 15 60 130
$txtWhipUrl = New-Object System.Windows.Forms.TextBox
$txtWhipUrl.Location = New-Object System.Drawing.Point(150, 60)
$txtWhipUrl.Size = New-Object System.Drawing.Size(725, 23)
$txtWhipUrl.Anchor = 'Top,Left,Right'
$txtWhipUrl.Text = 'http://10.0.0.25:8889/live/whip'
$settingsGroup.Controls.Add($txtWhipUrl)
$toolTip.SetToolTip($txtWhipUrl, 'MediaMTX example: http://server:8889/live/whip. Cloud providers may use an HTTPS publishing URL.')

$null = Add-Label $settingsGroup 'Monitor index' 15 96 100
$numMonitor = New-Object System.Windows.Forms.NumericUpDown
$numMonitor.Location = New-Object System.Drawing.Point(115, 96)
$numMonitor.Size = New-Object System.Drawing.Size(65, 23)
$numMonitor.Minimum = -1
$numMonitor.Maximum = 32
$numMonitor.Value = -1
$settingsGroup.Controls.Add($numMonitor)
$toolTip.SetToolTip($numMonitor, '-1 uses the primary monitor. Other values select a monitor by GStreamer index.')

$chkCursor = New-Object System.Windows.Forms.CheckBox
$chkCursor.Text = 'Show cursor'
$chkCursor.Location = New-Object System.Drawing.Point(195, 96)
$chkCursor.Size = New-Object System.Drawing.Size(105, 23)
$chkCursor.Checked = $true
$settingsGroup.Controls.Add($chkCursor)

$chkAutoRestart = New-Object System.Windows.Forms.CheckBox
$chkAutoRestart.Text = 'Auto-restart if pipeline exits'
$chkAutoRestart.Location = New-Object System.Drawing.Point(315, 96)
$chkAutoRestart.Size = New-Object System.Drawing.Size(190, 23)
$chkAutoRestart.Checked = $true
$settingsGroup.Controls.Add($chkAutoRestart)
$toolTip.SetToolTip($chkAutoRestart, 'Rebuilds the entire GStreamer process after an unexpected exit.')

$chkVerbose = New-Object System.Windows.Forms.CheckBox
$chkVerbose.Text = 'Verbose GStreamer output'
$chkVerbose.Location = New-Object System.Drawing.Point(520, 96)
$chkVerbose.Size = New-Object System.Drawing.Size(180, 23)
$chkVerbose.Checked = $false
$settingsGroup.Controls.Add($chkVerbose)

$null = Add-Label $settingsGroup 'Width' 15 132 55
$numWidth = New-Object System.Windows.Forms.NumericUpDown
$numWidth.Location = New-Object System.Drawing.Point(70, 132)
$numWidth.Size = New-Object System.Drawing.Size(85, 23)
$numWidth.Minimum = 320
$numWidth.Maximum = 7680
$numWidth.Increment = 16
$numWidth.Value = 1920
$settingsGroup.Controls.Add($numWidth)

$null = Add-Label $settingsGroup 'Height' 170 132 55
$numHeight = New-Object System.Windows.Forms.NumericUpDown
$numHeight.Location = New-Object System.Drawing.Point(225, 132)
$numHeight.Size = New-Object System.Drawing.Size(85, 23)
$numHeight.Minimum = 240
$numHeight.Maximum = 4320
$numHeight.Increment = 16
$numHeight.Value = 1080
$settingsGroup.Controls.Add($numHeight)

$null = Add-Label $settingsGroup 'FPS' 330 132 40
$numFps = New-Object System.Windows.Forms.NumericUpDown
$numFps.Location = New-Object System.Drawing.Point(370, 132)
$numFps.Size = New-Object System.Drawing.Size(65, 23)
$numFps.Minimum = 1
$numFps.Maximum = 240
$numFps.Value = 60
$settingsGroup.Controls.Add($numFps)

$null = Add-Label $settingsGroup 'Video bitrate (kbps)' 455 132 125
$numVideoBitrate = New-Object System.Windows.Forms.NumericUpDown
$numVideoBitrate.Location = New-Object System.Drawing.Point(585, 132)
$numVideoBitrate.Size = New-Object System.Drawing.Size(95, 23)
$numVideoBitrate.Minimum = 250
$numVideoBitrate.Maximum = 100000
$numVideoBitrate.Increment = 500
$numVideoBitrate.Value = 12000
$settingsGroup.Controls.Add($numVideoBitrate)

$null = Add-Label $settingsGroup 'GOP (seconds)' 700 132 95
$numGopSeconds = New-Object System.Windows.Forms.NumericUpDown
$numGopSeconds.Location = New-Object System.Drawing.Point(795, 132)
$numGopSeconds.Size = New-Object System.Drawing.Size(65, 23)
$numGopSeconds.Minimum = 1
$numGopSeconds.Maximum = 10
$numGopSeconds.Value = 1
$settingsGroup.Controls.Add($numGopSeconds)

$null = Add-Label $settingsGroup 'NVENC preset' 15 168 90
$cmbPreset = New-Object System.Windows.Forms.ComboBox
$cmbPreset.Location = New-Object System.Drawing.Point(105, 168)
$cmbPreset.Size = New-Object System.Drawing.Size(80, 23)
$cmbPreset.DropDownStyle = 'DropDownList'
$null = $cmbPreset.Items.AddRange(@('p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7'))
$cmbPreset.SelectedItem = 'p1'
$settingsGroup.Controls.Add($cmbPreset)
$toolTip.SetToolTip($cmbPreset, 'p1 is fastest/lowest latency. Higher values trade speed for compression quality.')

$null = Add-Label $settingsGroup 'H.264 profile' 205 168 90
$cmbProfile = New-Object System.Windows.Forms.ComboBox
$cmbProfile.Location = New-Object System.Drawing.Point(295, 168)
$cmbProfile.Size = New-Object System.Drawing.Size(145, 23)
$cmbProfile.DropDownStyle = 'DropDownList'
$null = $cmbProfile.Items.AddRange(@('constrained-baseline', 'baseline', 'main', 'high'))
$cmbProfile.SelectedItem = 'constrained-baseline'
$settingsGroup.Controls.Add($cmbProfile)

$null = Add-Label $settingsGroup 'Rate control' 460 168 80
$txtRateControl = New-Object System.Windows.Forms.TextBox
$txtRateControl.Location = New-Object System.Drawing.Point(540, 168)
$txtRateControl.Size = New-Object System.Drawing.Size(75, 23)
$txtRateControl.Text = 'CBR'
$txtRateControl.ReadOnly = $true
$settingsGroup.Controls.Add($txtRateControl)

$null = Add-Label $settingsGroup 'Queue policy' 635 168 80
$txtQueuePolicy = New-Object System.Windows.Forms.TextBox
$txtQueuePolicy.Location = New-Object System.Drawing.Point(715, 168)
$txtQueuePolicy.Size = New-Object System.Drawing.Size(145, 23)
$txtQueuePolicy.Text = '2 frames, drop stale'
$txtQueuePolicy.ReadOnly = $true
$settingsGroup.Controls.Add($txtQueuePolicy)

$chkDesktopAudio = New-Object System.Windows.Forms.CheckBox
$chkDesktopAudio.Text = 'Desktop audio'
$chkDesktopAudio.Location = New-Object System.Drawing.Point(15, 208)
$chkDesktopAudio.Size = New-Object System.Drawing.Size(115, 23)
$chkDesktopAudio.Checked = $true
$settingsGroup.Controls.Add($chkDesktopAudio)

$null = Add-Label $settingsGroup 'Volume %' 135 208 65
$numDesktopVolume = New-Object System.Windows.Forms.NumericUpDown
$numDesktopVolume.Location = New-Object System.Drawing.Point(200, 208)
$numDesktopVolume.Size = New-Object System.Drawing.Size(65, 23)
$numDesktopVolume.Minimum = 0
$numDesktopVolume.Maximum = 200
$numDesktopVolume.Value = 100
$settingsGroup.Controls.Add($numDesktopVolume)

$chkMic = New-Object System.Windows.Forms.CheckBox
$chkMic.Text = 'Default microphone'
$chkMic.Location = New-Object System.Drawing.Point(295, 208)
$chkMic.Size = New-Object System.Drawing.Size(140, 23)
$chkMic.Checked = $false
$settingsGroup.Controls.Add($chkMic)

$null = Add-Label $settingsGroup 'Volume %' 440 208 65
$numMicVolume = New-Object System.Windows.Forms.NumericUpDown
$numMicVolume.Location = New-Object System.Drawing.Point(505, 208)
$numMicVolume.Size = New-Object System.Drawing.Size(65, 23)
$numMicVolume.Minimum = 0
$numMicVolume.Maximum = 200
$numMicVolume.Value = 100
$settingsGroup.Controls.Add($numMicVolume)

$null = Add-Label $settingsGroup 'Opus bitrate (kbps)' 600 208 125
$numAudioBitrate = New-Object System.Windows.Forms.NumericUpDown
$numAudioBitrate.Location = New-Object System.Drawing.Point(730, 208)
$numAudioBitrate.Size = New-Object System.Drawing.Size(80, 23)
$numAudioBitrate.Minimum = 32
$numAudioBitrate.Maximum = 512
$numAudioBitrate.Increment = 16
$numAudioBitrate.Value = 128
$settingsGroup.Controls.Add($numAudioBitrate)

$audioNote = New-Object System.Windows.Forms.Label
$audioNote.Text = 'Desktop audio uses WASAPI loopback. Microphone uses the Windows/GStreamer default capture device.'
$audioNote.Location = New-Object System.Drawing.Point(15, 242)
$audioNote.Size = New-Object System.Drawing.Size(845, 22)
$audioNote.ForeColor = [System.Drawing.Color]::DimGray
$settingsGroup.Controls.Add($audioNote)

$latencyNote = New-Object System.Windows.Forms.Label
$latencyNote.Text = 'Low-latency settings are enforced: D3D11 GPU path, NVENC ultra-low-latency, B-frame-free baseline caps, 10 ms Opus frames, and leaky queues.'
$latencyNote.Location = New-Object System.Drawing.Point(15, 270)
$latencyNote.Size = New-Object System.Drawing.Size(850, 30)
$latencyNote.ForeColor = [System.Drawing.Color]::DimGray
$settingsGroup.Controls.Add($latencyNote)

$commandGroup = New-Object System.Windows.Forms.GroupBox
$commandGroup.Text = 'Generated Command'
$commandGroup.Location = New-Object System.Drawing.Point(10, 335)
$commandGroup.Size = New-Object System.Drawing.Size(895, 118)
$commandGroup.Anchor = 'Top,Left,Right'
$form.Controls.Add($commandGroup)

$txtCommand = New-Object System.Windows.Forms.TextBox
$txtCommand.Location = New-Object System.Drawing.Point(12, 22)
$txtCommand.Size = New-Object System.Drawing.Size(870, 82)
$txtCommand.Multiline = $true
$txtCommand.ScrollBars = 'Both'
$txtCommand.WordWrap = $false
$txtCommand.ReadOnly = $true
$txtCommand.Font = New-Object System.Drawing.Font('Consolas', 8.5)
$txtCommand.Anchor = 'Top,Bottom,Left,Right'
$commandGroup.Controls.Add($txtCommand)

$btnStart = New-Object System.Windows.Forms.Button
$btnStart.Text = 'Start Stream'
$btnStart.Location = New-Object System.Drawing.Point(10, 465)
$btnStart.Size = New-Object System.Drawing.Size(120, 34)
$btnStart.Font = New-Object System.Drawing.Font('Segoe UI', 9, [System.Drawing.FontStyle]::Bold)
$form.Controls.Add($btnStart)

$btnStop = New-Object System.Windows.Forms.Button
$btnStop.Text = 'Stop'
$btnStop.Location = New-Object System.Drawing.Point(140, 465)
$btnStop.Size = New-Object System.Drawing.Size(90, 34)
$btnStop.Enabled = $false
$form.Controls.Add($btnStop)

$btnRestart = New-Object System.Windows.Forms.Button
$btnRestart.Text = 'Restart Pipeline'
$btnRestart.Location = New-Object System.Drawing.Point(240, 465)
$btnRestart.Size = New-Object System.Drawing.Size(125, 34)
$btnRestart.Enabled = $false
$form.Controls.Add($btnRestart)

$btnCopyCommand = New-Object System.Windows.Forms.Button
$btnCopyCommand.Text = 'Copy Command'
$btnCopyCommand.Location = New-Object System.Drawing.Point(375, 465)
$btnCopyCommand.Size = New-Object System.Drawing.Size(115, 34)
$form.Controls.Add($btnCopyCommand)

$btnClearLog = New-Object System.Windows.Forms.Button
$btnClearLog.Text = 'Clear Log'
$btnClearLog.Location = New-Object System.Drawing.Point(500, 465)
$btnClearLog.Size = New-Object System.Drawing.Size(90, 34)
$form.Controls.Add($btnClearLog)

$statusLabel = New-Object System.Windows.Forms.Label
$statusLabel.Text = 'Stopped'
$statusLabel.Location = New-Object System.Drawing.Point(610, 470)
$statusLabel.Size = New-Object System.Drawing.Size(295, 25)
$statusLabel.TextAlign = 'MiddleRight'
$statusLabel.Anchor = 'Top,Right'
$statusLabel.Font = New-Object System.Drawing.Font('Segoe UI', 9, [System.Drawing.FontStyle]::Bold)
$form.Controls.Add($statusLabel)

$logGroup = New-Object System.Windows.Forms.GroupBox
$logGroup.Text = 'GStreamer Output'
$logGroup.Location = New-Object System.Drawing.Point(10, 510)
$logGroup.Size = New-Object System.Drawing.Size(895, 230)
$logGroup.Anchor = 'Top,Bottom,Left,Right'
$form.Controls.Add($logGroup)

$txtLog = New-Object System.Windows.Forms.TextBox
$txtLog.Location = New-Object System.Drawing.Point(12, 22)
$txtLog.Size = New-Object System.Drawing.Size(870, 195)
$txtLog.Multiline = $true
$txtLog.ScrollBars = 'Both'
$txtLog.WordWrap = $false
$txtLog.ReadOnly = $true
$txtLog.Font = New-Object System.Drawing.Font('Consolas', 8.5)
$txtLog.Anchor = 'Top,Bottom,Left,Right'
$logGroup.Controls.Add($txtLog)

function Append-Log {
    param([string]$Text)

    if ([string]::IsNullOrEmpty($Text)) {
        return
    }

    $txtLog.AppendText($Text)
    if (-not $Text.EndsWith([Environment]::NewLine)) {
        $txtLog.AppendText([Environment]::NewLine)
    }

    if ($txtLog.TextLength -gt 250000) {
        $txtLog.Text = $txtLog.Text.Substring($txtLog.TextLength - 180000)
    }

    $txtLog.SelectionStart = $txtLog.TextLength
    $txtLog.ScrollToCaret()
}

function Set-RunState {
    param([bool]$Running)

    $btnStart.Enabled = -not $Running
    $btnStop.Enabled = $Running
    $btnRestart.Enabled = $Running
}

function Build-GstArguments {
    $url = $txtWhipUrl.Text.Trim()
    $quotedUrl = Quote-GstValue $url

    $monitor = [int]$numMonitor.Value
    $cursor = if ($chkCursor.Checked) { 'true' } else { 'false' }
    $width = [int]$numWidth.Value
    $height = [int]$numHeight.Value
    $fps = [int]$numFps.Value
    $videoBitrate = [int]$numVideoBitrate.Value
    $gopSize = [Math]::Max(1, $fps * [int]$numGopSeconds.Value)
    $preset = [string]$cmbPreset.SelectedItem
    $profile = [string]$cmbProfile.SelectedItem
    $audioBitrate = [int]$numAudioBitrate.Value * 1000
    $desktopVolume = Format-InvariantNumber ([double]$numDesktopVolume.Value / 100.0)
    $micVolume = Format-InvariantNumber ([double]$numMicVolume.Value / 100.0)

    $videoBranch = @(
        'd3d11screencapturesrc'
        "monitor-index=$monitor"
        "show-cursor=$cursor"
        '!'
        "`"video/x-raw(memory:D3D11Memory),framerate=$fps/1`""
        '!'
        'd3d11convert'
        '!'
        "`"video/x-raw(memory:D3D11Memory),format=NV12,width=$width,height=$height,framerate=$fps/1`""
        '!'
        'queue'
        'max-size-buffers=2'
        'max-size-bytes=0'
        'max-size-time=0'
        'leaky=downstream'
        '!'
        'nvd3d11h264enc'
        "bitrate=$videoBitrate"
        'rc-mode=cbr'
        "preset=$preset"
        'tune=ultra-low-latency'
        "gop-size=$gopSize"
        'rc-lookahead=0'
        'repeat-sequence-header=true'
        '!'
        'h264parse'
        'config-interval=-1'
        '!'
        "`"video/x-h264,profile=$profile,stream-format=byte-stream,alignment=au`""
    ) -join ' '

    $desktopEnabled = $chkDesktopAudio.Checked
    $micEnabled = $chkMic.Checked

    if (-not $desktopEnabled -and -not $micEnabled) {
        $pipeline = "$videoBranch ! whipclientsink video-caps=`"video/x-h264`" signaller::whip-endpoint=$quotedUrl"
    }
    elseif ($desktopEnabled -and -not $micEnabled) {
        $desktopBranch = @(
            'wasapi2src'
            'loopback=true'
            'low-latency=true'
            '!'
            'queue'
            'max-size-buffers=4'
            'max-size-bytes=0'
            'max-size-time=0'
            'leaky=downstream'
            '!'
            'audioconvert'
            '!'
            'audioresample'
            '!'
            '"audio/x-raw,format=S16LE,rate=48000,channels=2"'
            '!'
            'volume'
            "volume=$desktopVolume"
            '!'
            'opusenc'
            "bitrate=$audioBitrate"
            'bitrate-type=cbr'
            'frame-size=10'
            'audio-type=restricted-lowdelay'
            '!'
            '"audio/x-opus"'
            '!'
            'whip.audio_0'
        ) -join ' '

        $pipeline = "whipclientsink name=whip video-caps=`"video/x-h264`" audio-caps=`"audio/x-opus`" signaller::whip-endpoint=$quotedUrl $videoBranch ! whip.video_0 $desktopBranch"
    }
    elseif (-not $desktopEnabled -and $micEnabled) {
        $micBranch = @(
            'wasapi2src'
            'low-latency=true'
            '!'
            'queue'
            'max-size-buffers=4'
            'max-size-bytes=0'
            'max-size-time=0'
            'leaky=downstream'
            '!'
            'audioconvert'
            '!'
            'audioresample'
            '!'
            '"audio/x-raw,format=S16LE,rate=48000,channels=2"'
            '!'
            'volume'
            "volume=$micVolume"
            '!'
            'opusenc'
            "bitrate=$audioBitrate"
            'bitrate-type=cbr'
            'frame-size=10'
            'audio-type=restricted-lowdelay'
            '!'
            '"audio/x-opus"'
            '!'
            'whip.audio_0'
        ) -join ' '

        $pipeline = "whipclientsink name=whip video-caps=`"video/x-h264`" audio-caps=`"audio/x-opus`" signaller::whip-endpoint=$quotedUrl $videoBranch ! whip.video_0 $micBranch"
    }
    else {
        $desktopMixBranch = @(
            'wasapi2src'
            'loopback=true'
            'low-latency=true'
            '!'
            'queue'
            'max-size-buffers=8'
            'max-size-bytes=0'
            'max-size-time=0'
            'leaky=downstream'
            '!'
            'audioconvert'
            '!'
            'audioresample'
            '!'
            '"audio/x-raw,format=F32LE,rate=48000,channels=2"'
            '!'
            'volume'
            "volume=$desktopVolume"
            '!'
            'mix.'
        ) -join ' '

        $micMixBranch = @(
            'wasapi2src'
            'low-latency=true'
            '!'
            'queue'
            'max-size-buffers=8'
            'max-size-bytes=0'
            'max-size-time=0'
            'leaky=downstream'
            '!'
            'audioconvert'
            '!'
            'audioresample'
            '!'
            '"audio/x-raw,format=F32LE,rate=48000,channels=2"'
            '!'
            'volume'
            "volume=$micVolume"
            '!'
            'mix.'
        ) -join ' '

        $mixedOutput = @(
            'mix.'
            '!'
            'queue'
            'max-size-buffers=8'
            'max-size-bytes=0'
            'max-size-time=0'
            'leaky=downstream'
            '!'
            'audioconvert'
            '!'
            '"audio/x-raw,format=S16LE,rate=48000,channels=2"'
            '!'
            'opusenc'
            "bitrate=$audioBitrate"
            'bitrate-type=cbr'
            'frame-size=10'
            'audio-type=restricted-lowdelay'
            '!'
            '"audio/x-opus"'
            '!'
            'whip.audio_0'
        ) -join ' '

        $pipeline = "whipclientsink name=whip video-caps=`"video/x-h264`" audio-caps=`"audio/x-opus`" signaller::whip-endpoint=$quotedUrl audiomixer name=mix $videoBranch ! whip.video_0 $desktopMixBranch $micMixBranch $mixedOutput"
    }

    $flags = '-e'
    if ($chkVerbose.Checked) {
        $flags += ' -v'
    }

    return "$flags $pipeline"
}

function Update-CommandPreview {
    try {
        $gstPath = $txtGstPath.Text.Trim()
        if ([string]::IsNullOrWhiteSpace($gstPath)) {
            $gstPath = 'gst-launch-1.0.exe'
        }

        $txtCommand.Text = '& ' + (Quote-GstValue $gstPath) + ' ' + (Build-GstArguments)
    }
    catch {
        $txtCommand.Text = "Unable to build command: $($_.Exception.Message)"
    }
}

function Save-Settings {
    try {
        if (-not (Test-Path -LiteralPath $script:ConfigDirectory)) {
            $null = New-Item -ItemType Directory -Path $script:ConfigDirectory -Force
        }

        $settings = [ordered]@{
            GstPath            = $txtGstPath.Text
            WhipUrl            = $txtWhipUrl.Text
            MonitorIndex       = [int]$numMonitor.Value
            ShowCursor         = $chkCursor.Checked
            AutoRestart        = $chkAutoRestart.Checked
            Verbose            = $chkVerbose.Checked
            Width              = [int]$numWidth.Value
            Height             = [int]$numHeight.Value
            Fps                = [int]$numFps.Value
            VideoBitrateKbps   = [int]$numVideoBitrate.Value
            GopSeconds         = [int]$numGopSeconds.Value
            Preset             = [string]$cmbPreset.SelectedItem
            Profile            = [string]$cmbProfile.SelectedItem
            DesktopAudio       = $chkDesktopAudio.Checked
            DesktopVolume      = [int]$numDesktopVolume.Value
            Microphone         = $chkMic.Checked
            MicrophoneVolume   = [int]$numMicVolume.Value
            AudioBitrateKbps   = [int]$numAudioBitrate.Value
        }

        $settings | ConvertTo-Json | Set-Content -LiteralPath $script:ConfigPath -Encoding UTF8
    }
    catch {
        Append-Log "Could not save settings: $($_.Exception.Message)"
    }
}

function Load-Settings {
    if (-not (Test-Path -LiteralPath $script:ConfigPath)) {
        return
    }

    try {
        $settings = Get-Content -LiteralPath $script:ConfigPath -Raw | ConvertFrom-Json

        if ($settings.GstPath) { $txtGstPath.Text = [string]$settings.GstPath }
        if ($settings.WhipUrl) { $txtWhipUrl.Text = [string]$settings.WhipUrl }
        if ($null -ne $settings.MonitorIndex) { $numMonitor.Value = [decimal]$settings.MonitorIndex }
        if ($null -ne $settings.ShowCursor) { $chkCursor.Checked = [bool]$settings.ShowCursor }
        if ($null -ne $settings.AutoRestart) { $chkAutoRestart.Checked = [bool]$settings.AutoRestart }
        if ($null -ne $settings.Verbose) { $chkVerbose.Checked = [bool]$settings.Verbose }
        if ($settings.Width) { $numWidth.Value = [decimal]$settings.Width }
        if ($settings.Height) { $numHeight.Value = [decimal]$settings.Height }
        if ($settings.Fps) { $numFps.Value = [decimal]$settings.Fps }
        if ($settings.VideoBitrateKbps) { $numVideoBitrate.Value = [decimal]$settings.VideoBitrateKbps }
        if ($settings.GopSeconds) { $numGopSeconds.Value = [decimal]$settings.GopSeconds }
        if ($settings.Preset -and $cmbPreset.Items.Contains([string]$settings.Preset)) { $cmbPreset.SelectedItem = [string]$settings.Preset }
        if ($settings.Profile -and $cmbProfile.Items.Contains([string]$settings.Profile)) { $cmbProfile.SelectedItem = [string]$settings.Profile }
        if ($null -ne $settings.DesktopAudio) { $chkDesktopAudio.Checked = [bool]$settings.DesktopAudio }
        if ($null -ne $settings.DesktopVolume) { $numDesktopVolume.Value = [decimal]$settings.DesktopVolume }
        if ($null -ne $settings.Microphone) { $chkMic.Checked = [bool]$settings.Microphone }
        if ($null -ne $settings.MicrophoneVolume) { $numMicVolume.Value = [decimal]$settings.MicrophoneVolume }
        if ($settings.AudioBitrateKbps) { $numAudioBitrate.Value = [decimal]$settings.AudioBitrateKbps }
    }
    catch {
        Append-Log "Could not load settings: $($_.Exception.Message)"
    }
}

function Validate-Configuration {
    $gstPath = $txtGstPath.Text.Trim()
    if ([string]::IsNullOrWhiteSpace($gstPath) -or -not (Test-Path -LiteralPath $gstPath)) {
        [System.Windows.Forms.MessageBox]::Show(
            'Select a valid gst-launch-1.0.exe path.',
            $script:AppName,
            'OK',
            'Warning'
        ) | Out-Null
        return $false
    }

    $url = $txtWhipUrl.Text.Trim()
    if ($url -notmatch '^https?://') {
        [System.Windows.Forms.MessageBox]::Show(
            'The WHIP endpoint must begin with http:// or https://.',
            $script:AppName,
            'OK',
            'Warning'
        ) | Out-Null
        return $false
    }

    return $true
}

function Start-GstStream {
    if ($script:GstProcess -and -not $script:GstProcess.HasExited) {
        return
    }

    if (-not (Validate-Configuration)) {
        return
    }

    Save-Settings

    if (-not (Test-Path -LiteralPath $script:LogDirectory)) {
        $null = New-Item -ItemType Directory -Path $script:LogDirectory -Force
    }

    $stamp = Get-Date -Format 'yyyyMMdd-HHmmss-fff'
    $script:StdOutPath = Join-Path $script:LogDirectory "gst-$stamp-out.log"
    $script:StdErrPath = Join-Path $script:LogDirectory "gst-$stamp-err.log"
    $script:StdOutPosition = [int64]0
    $script:StdErrPosition = [int64]0
    $script:StopRequested = $false
    $script:RestartAt = $null

    $gstPath = $txtGstPath.Text.Trim()
    $arguments = Build-GstArguments

    Append-Log "[$(Get-Date -Format 'HH:mm:ss')] Starting full GStreamer pipeline..."
    Append-Log "Executable: $gstPath"
    Append-Log "Arguments: $arguments"

    try {
        $script:GstProcess = Start-Process -FilePath $gstPath -ArgumentList $arguments -RedirectStandardOutput $script:StdOutPath -RedirectStandardError $script:StdErrPath -WindowStyle Hidden -PassThru

        $statusLabel.Text = "Streaming — PID $($script:GstProcess.Id)"
        $statusLabel.ForeColor = [System.Drawing.Color]::DarkGreen
        Set-RunState $true
    }
    catch {
        $script:GstProcess = $null
        $statusLabel.Text = 'Start failed'
        $statusLabel.ForeColor = [System.Drawing.Color]::DarkRed
        Set-RunState $false
        Append-Log "START ERROR: $($_.Exception.Message)"
    }
}

function Stop-GstStream {
    param([switch]$Restart)

    $script:StopRequested = $true
    if ($Restart) {
        $script:RestartAt = (Get-Date).AddMilliseconds(800)
    }
    else {
        $script:RestartAt = $null
    }

    if ($script:GstProcess -and -not $script:GstProcess.HasExited) {
        $statusLabel.Text = 'Stopping...'
        $statusLabel.ForeColor = [System.Drawing.Color]::DarkOrange
        Append-Log "[$(Get-Date -Format 'HH:mm:ss')] Stopping complete process tree..."

        try {
            $taskKillArguments = "/PID $($script:GstProcess.Id) /T /F"
            $null = Start-Process -FilePath 'taskkill.exe' -ArgumentList $taskKillArguments -WindowStyle Hidden -Wait -PassThru
        }
        catch {
            try {
                $script:GstProcess.Kill()
            }
            catch {
                Append-Log "STOP ERROR: $($_.Exception.Message)"
            }
        }
    }
    elseif ($Restart) {
        $script:GstProcess = $null
    }
    else {
        $script:GstProcess = $null
        $statusLabel.Text = 'Stopped'
        $statusLabel.ForeColor = [System.Drawing.Color]::Black
        Set-RunState $false
    }
}

function Test-GStreamerElements {
    $gstPath = $txtGstPath.Text.Trim()
    if ([string]::IsNullOrWhiteSpace($gstPath) -or -not (Test-Path -LiteralPath $gstPath)) {
        [System.Windows.Forms.MessageBox]::Show('Select a valid gst-launch-1.0.exe first.', $script:AppName, 'OK', 'Warning') | Out-Null
        return
    }

    $inspectPath = Join-Path (Split-Path -Parent $gstPath) 'gst-inspect-1.0.exe'
    if (-not (Test-Path -LiteralPath $inspectPath)) {
        [System.Windows.Forms.MessageBox]::Show('gst-inspect-1.0.exe was not found beside gst-launch-1.0.exe.', $script:AppName, 'OK', 'Warning') | Out-Null
        return
    }

    $elements = @(
        'd3d11screencapturesrc',
        'd3d11convert',
        'nvd3d11h264enc',
        'h264parse',
        'whipclientsink',
        'wasapi2src',
        'audioconvert',
        'audioresample',
        'opusenc',
        'audiomixer',
        'volume'
    )

    $missing = New-Object System.Collections.Generic.List[string]
    $form.Cursor = [System.Windows.Forms.Cursors]::WaitCursor
    try {
        foreach ($element in $elements) {
            & $inspectPath $element *> $null
            if ($LASTEXITCODE -ne 0) {
                $missing.Add($element)
            }
        }
    }
    finally {
        $form.Cursor = [System.Windows.Forms.Cursors]::Default
    }

    if ($missing.Count -eq 0) {
        [System.Windows.Forms.MessageBox]::Show('All required GStreamer elements were found.', $script:AppName, 'OK', 'Information') | Out-Null
    }
    else {
        [System.Windows.Forms.MessageBox]::Show(
            "Missing GStreamer elements:`r`n`r`n$($missing -join "`r`n")",
            $script:AppName,
            'OK',
            'Error'
        ) | Out-Null
    }
}

$previewHandler = {
    Update-CommandPreview
}

$txtGstPath.Add_TextChanged($previewHandler)
$txtWhipUrl.Add_TextChanged($previewHandler)
$numMonitor.Add_ValueChanged($previewHandler)
$chkCursor.Add_CheckedChanged($previewHandler)
$chkAutoRestart.Add_CheckedChanged($previewHandler)
$chkVerbose.Add_CheckedChanged($previewHandler)
$numWidth.Add_ValueChanged($previewHandler)
$numHeight.Add_ValueChanged($previewHandler)
$numFps.Add_ValueChanged($previewHandler)
$numVideoBitrate.Add_ValueChanged($previewHandler)
$numGopSeconds.Add_ValueChanged($previewHandler)
$cmbPreset.Add_SelectedIndexChanged($previewHandler)
$cmbProfile.Add_SelectedIndexChanged($previewHandler)
$chkDesktopAudio.Add_CheckedChanged($previewHandler)
$numDesktopVolume.Add_ValueChanged($previewHandler)
$chkMic.Add_CheckedChanged($previewHandler)
$numMicVolume.Add_ValueChanged($previewHandler)
$numAudioBitrate.Add_ValueChanged($previewHandler)

$btnBrowseGst.Add_Click({
    $dialog = New-Object System.Windows.Forms.OpenFileDialog
    $dialog.Title = 'Select gst-launch-1.0.exe'
    $dialog.Filter = 'GStreamer launcher (gst-launch-1.0.exe)|gst-launch-1.0.exe|Executable files (*.exe)|*.exe|All files (*.*)|*.*'
    if ($txtGstPath.Text -and (Test-Path -LiteralPath $txtGstPath.Text)) {
        $dialog.InitialDirectory = Split-Path -Parent $txtGstPath.Text
        $dialog.FileName = Split-Path -Leaf $txtGstPath.Text
    }

    if ($dialog.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
        $txtGstPath.Text = $dialog.FileName
    }
    $dialog.Dispose()
})

$btnCheckGst.Add_Click({ Test-GStreamerElements })
$btnStart.Add_Click({ Start-GstStream })
$btnStop.Add_Click({ Stop-GstStream })
$btnRestart.Add_Click({ Stop-GstStream -Restart })
$btnCopyCommand.Add_Click({
    try {
        [System.Windows.Forms.Clipboard]::SetText($txtCommand.Text)
        $statusLabel.Text = 'Command copied'
        $statusLabel.ForeColor = [System.Drawing.Color]::DarkBlue
    }
    catch {
        Append-Log "Clipboard error: $($_.Exception.Message)"
    }
})
$btnClearLog.Add_Click({ $txtLog.Clear() })

$pollTimer = New-Object System.Windows.Forms.Timer
$pollTimer.Interval = 400
$pollTimer.Add_Tick({
    $stdoutText = Read-NewLogText -Path $script:StdOutPath -Position ([ref]$script:StdOutPosition)
    if ($stdoutText) { Append-Log $stdoutText }

    $stderrText = Read-NewLogText -Path $script:StdErrPath -Position ([ref]$script:StdErrPosition)
    if ($stderrText) { Append-Log $stderrText }

    if ($script:GstProcess -and $script:GstProcess.HasExited) {
        $exitCode = $script:GstProcess.ExitCode
        $wasRequested = $script:StopRequested

        try { $script:GstProcess.Dispose() } catch {}
        $script:GstProcess = $null
        Set-RunState $false

        if ($wasRequested) {
            $statusLabel.Text = 'Stopped'
            $statusLabel.ForeColor = [System.Drawing.Color]::Black
            Append-Log "[$(Get-Date -Format 'HH:mm:ss')] Pipeline stopped."
        }
        else {
            $statusLabel.Text = "Pipeline exited — code $exitCode"
            $statusLabel.ForeColor = [System.Drawing.Color]::DarkRed
            Append-Log "[$(Get-Date -Format 'HH:mm:ss')] Pipeline exited unexpectedly with code $exitCode."

            if ($chkAutoRestart.Checked) {
                $script:RestartAt = (Get-Date).AddSeconds(2)
                Append-Log 'Automatic full restart scheduled in 2 seconds.'
            }
        }

        $script:StopRequested = $false
    }

    if (-not $script:GstProcess -and $script:RestartAt -and (Get-Date) -ge $script:RestartAt) {
        $script:RestartAt = $null
        Start-GstStream
    }
})
$pollTimer.Start()

$form.Add_Shown({
    Load-Settings
    Update-CommandPreview
})

$form.Add_FormClosing({
    Save-Settings
    $chkAutoRestart.Checked = $false
    $script:RestartAt = $null
    if ($script:GstProcess -and -not $script:GstProcess.HasExited) {
        Stop-GstStream
    }
    $pollTimer.Stop()
})

[void]$form.ShowDialog()

Launch-GStreamer-Basic-WHIP-GUI.cmd

@echo off
powershell.exe -NoProfile -ExecutionPolicy Bypass -STA -File "%~dp0GStreamer-Basic-WHIP-GUI.ps1"