deps.windows: Build libdatachannel

The libdatachannel compilation on MSVC relies on mbedTLS.
But since the latter DLLs fail to compile on MSVC due to long-standing
bugs, mbedTLS is linked statically to libdatachannel.
The library is checked out at a commit enabling simulcast.

Signed-off-by: pkv <pkv@obsproject.com>

deps.windows/70-libdatachannel.ps1

@@ -0,0 +1,83 @@
+param(
+    [string] $Name = 'libdatachannel',
+    [string] $Version = '0.19.0-alpha.4',
+    [string] $Uri = 'https://github.com/paullouisageneau/libdatachannel.git',
+    [string] $Hash = '709a66339451bb4c8d4e5ced78c67605ec09da31',
+    [switch] $ForceShared = $true
+)
+
+function Setup {
+    Invoke-GitCheckout -Uri $Uri -Commit $Hash
+}
+
+function Clean {
+    Set-Location $Path
+
+    if ( Test-Path "build_${Target}" ) {
+        Log-Information "Clean build directory (${Target})"
+        Remove-Item -Path "build_${Target}" -Recurse -Force
+    }
+}
+
+function Configure {
+    Log-Information "Configure (${Target})"
+    Set-Location $Path
+
+   if ( $ForceShared -and ( $script:Shared -eq $false ) ) {
+        $Shared = $true
+    } else {
+        $Shared = $script:Shared.isPresent
+    }
+
+    $OnOff = @('OFF', 'ON')
+    $Options = @(
+        $CmakeOptions
+        "-DENABLE_SHARED:BOOL=$($OnOff[$Shared])"
+        '-DUSE_MBEDTLS=BOOL=ON'
+        '-DNO_WEBSOCKET=BOOL=ON'
+        '-DNO_TESTS=BOOL=ON'
+        '-DNO_EXAMPLES=BOOL=ON'
+    )
+
+    Invoke-External cmake -S . -B "build_${Target}" @Options
+}
+
+function Build {
+    Log-Information "Build (${Target})"
+    Set-Location $Path
+
+    $Options = @(
+        '--build', "build_${Target}"
+        '--config', $Configuration
+    )
+
+    if ( $VerbosePreference -eq 'Continue' ) {
+        $Options += '--verbose'
+    }
+
+    $Options += @(
+        '--'
+        '/consoleLoggerParameters:Summary'
+        '/noLogo'
+        '/p:UseMultiToolTask=true'
+        '/p:EnforceProcessCountAcrossBuilds=true'
+    )
+
+    Invoke-External cmake @Options
+}
+
+function Install {
+    Log-Information "Install (${Target})"
+    Set-Location $Path
+
+    $Options = @(
+        '--install', "build_${Target}"
+        '--config', $Configuration
+    )
+
+    if ( $Configuration -match "(Release|MinSizeRel)" ) {
+        $Options += '--strip'
+    }
+
+    Invoke-External cmake @Options
+}