Add Universal Windows Platform example using Audio Graph API

uwp/.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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+# User-specific files
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+x86/
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+[Oo]bj/
+[Ll]og/
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+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
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+# MSTest test Results
+[Tt]est[Rr]esult*/
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+# NUNIT
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+TestResult.xml
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+# Benchmark Results
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+# Files built by Visual Studio
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+# NuGet Packages
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+**/[Pp]ackages/*
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+!**/[Pp]ackages/build/
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+#!**/[Pp]ackages/repositories.config
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+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
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+# RIA/Silverlight projects
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+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
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+Backup*/
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+paket-files/
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+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder 
+.mfractor/

uwp/DeepSpeechUWP.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29519.87
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DeepSpeechUWP", "DeepSpeechUWP\DeepSpeechUWP.csproj", "{49AAC24D-6A76-4910-913A-94D2D67B6226}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM = Debug|ARM
+		Debug|ARM64 = Debug|ARM64
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM = Release|ARM
+		Release|ARM64 = Release|ARM64
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM.ActiveCfg = Debug|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM.Build.0 = Debug|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM.Deploy.0 = Debug|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM64.Build.0 = Debug|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|ARM64.Deploy.0 = Debug|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x64.ActiveCfg = Debug|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x64.Build.0 = Debug|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x64.Deploy.0 = Debug|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x86.ActiveCfg = Debug|x86
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x86.Build.0 = Debug|x86
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Debug|x86.Deploy.0 = Debug|x86
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM.ActiveCfg = Release|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM.Build.0 = Release|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM.Deploy.0 = Release|ARM
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM64.ActiveCfg = Release|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM64.Build.0 = Release|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|ARM64.Deploy.0 = Release|ARM64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x64.ActiveCfg = Release|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x64.Build.0 = Release|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x64.Deploy.0 = Release|x64
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x86.ActiveCfg = Release|x86
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x86.Build.0 = Release|x86
+		{49AAC24D-6A76-4910-913A-94D2D67B6226}.Release|x86.Deploy.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D6764C5D-937A-4FF8-AE1F-29EC004C905C}
+	EndGlobalSection
+EndGlobal

uwp/DeepSpeechUWP/.gitignore

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+models/*

uwp/DeepSpeechUWP/App.xaml

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+<Application
+    x:Class="DeepSpeechUWP.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:DeepSpeechUWP">
+
+</Application>

uwp/DeepSpeechUWP/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.ViewManagement;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+namespace DeepSpeechUWP
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    sealed partial class App : Application
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+            this.Suspending += OnSuspending;
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            Frame rootFrame = Window.Current.Content as Frame;
+
+            // Do not repeat app initialization when the Window already has content,
+            // just ensure that the window is active
+            if (rootFrame == null)
+            {
+                // Create a Frame to act as the navigation context and navigate to the first page
+                rootFrame = new Frame();
+
+                rootFrame.NavigationFailed += OnNavigationFailed;
+
+                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    //TODO: Load state from previously suspended application
+                }
+
+                // Place the frame in the current Window
+                Window.Current.Content = rootFrame;
+            }
+
+            if (e.PrelaunchActivated == false)
+            {
+                if (rootFrame.Content == null)
+                {
+                    // When the navigation stack isn't restored navigate to the first page,
+                    // configuring the new page by passing required information as a navigation
+                    // parameter
+                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
+                }
+                ApplicationView.PreferredLaunchViewSize = new Size(760, 640);
+                ApplicationView.PreferredLaunchWindowingMode = ApplicationViewWindowingMode.PreferredLaunchViewSize;
+                // Ensure the current window is active
+                Window.Current.Activate();
+            }
+        }
+
+        /// <summary>
+        /// Invoked when Navigation to a certain page fails
+        /// </summary>
+        /// <param name="sender">The Frame which failed navigation</param>
+        /// <param name="e">Details about the navigation failure</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
+        }
+
+        /// <summary>
+        /// Invoked when application execution is being suspended.  Application state is saved
+        /// without knowing whether the application will be terminated or resumed with the contents
+        /// of memory still intact.
+        /// </summary>
+        /// <param name="sender">The source of the suspend request.</param>
+        /// <param name="e">Details about the suspend request.</param>
+        private void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            //TODO: Save application state and stop any background activity
+            deferral.Complete();
+        }
+    }
+}

uwp/DeepSpeechUWP/DeepSpeechUWP.csproj

@@ -0,0 +1,190 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProjectGuid>{49AAC24D-6A76-4910-913A-94D2D67B6226}</ProjectGuid>
+    <OutputType>AppContainerExe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>DeepSpeechUWP</RootNamespace>
+    <AssemblyName>DeepSpeechUWP</AssemblyName>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
+    <TargetPlatformVersion Condition=" '$(TargetPlatformVersion)' == '' ">10.0.18362.0</TargetPlatformVersion>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <MinimumVisualStudioVersion>14</MinimumVisualStudioVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WindowsXamlEnableOverview>true</WindowsXamlEnableOverview>
+    <AppxPackageSigningEnabled>false</AppxPackageSigningEnabled>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x86\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <OutputPath>bin\x86\Release\</OutputPath>
+    <DefineConstants>TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <Optimize>true</Optimize>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|ARM'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\ARM\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>full</DebugType>
+    <PlatformTarget>ARM</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|ARM'">
+    <OutputPath>bin\ARM\Release\</OutputPath>
+    <DefineConstants>TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <Optimize>true</Optimize>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>ARM</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|ARM64'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\ARM64\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>full</DebugType>
+    <PlatformTarget>ARM64</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|ARM64'">
+    <OutputPath>bin\ARM64\Release\</OutputPath>
+    <DefineConstants>TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <Optimize>true</Optimize>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>ARM64</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>bin\x64\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x64</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
+    <OutputPath>bin\x64\Release\</OutputPath>
+    <DefineConstants>TRACE;NETFX_CORE;WINDOWS_UWP</DefineConstants>
+    <Optimize>true</Optimize>
+    <NoWarn>;2008</NoWarn>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x64</PlatformTarget>
+    <UseVSHostingProcess>false</UseVSHostingProcess>
+    <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>true</Prefer32Bit>
+    <UseDotNetNativeToolchain>true</UseDotNetNativeToolchain>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup>
+    <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="MainPage.xaml.cs">
+      <DependentUpon>MainPage.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <AppxManifest Include="Package.appxmanifest">
+      <SubType>Designer</SubType>
+    </AppxManifest>
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Properties\Default.rd.xml" />
+    <Content Include="Assets\LockScreenLogo.scale-200.png" />
+    <Content Include="Assets\SplashScreen.scale-200.png" />
+    <Content Include="Assets\Square150x150Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.targetsize-24_altform-unplated.png" />
+    <Content Include="Assets\StoreLogo.png" />
+    <Content Include="Assets\Wide310x150Logo.scale-200.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Page Include="MainPage.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="DeepSpeech">
+      <Version>0.7.0</Version>
+    </PackageReference>
+    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
+      <Version>6.2.9</Version>
+    </PackageReference>
+    <Reference Include="DeepSpeechClient, Version=1.0.0.0, Culture=neutral, processorArchitecture=AMD64">
+      <HintPath>..\packages\DeepSpeech.0.7.0\lib\net46\DeepSpeechClient.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="models\deepspeech-0.7.0-models.pbmm">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Include="models\deepspeech-0.7.0-models.scorer">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+  <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '14.0' ">
+    <VisualStudioVersion>14.0</VisualStudioVersion>
+  </PropertyGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

uwp/DeepSpeechUWP/MainPage.xaml

@@ -0,0 +1,51 @@
+<Page
+    x:Class="DeepSpeechUWP.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:DeepSpeechUWP"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <Grid Margin="50">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="40" />
+        </Grid.RowDefinitions>
+        <StackPanel Grid.Row="0">
+            <TextBlock FontSize="30" FontWeight="Bold">DeepSpeech UWP Demo</TextBlock>
+            <TextBlock FontSize="20" Margin="0 4 0 40">powered by Audio Graph API</TextBlock>
+            <TextBlock Margin="0 0 0 10">Select an audio for transcription:</TextBlock>
+            <Grid ColumnSpacing="10">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="100" />
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="100" />
+                    <ColumnDefinition Width="100" />
+                </Grid.ColumnDefinitions>
+                <Button Grid.Column="0" HorizontalAlignment="Stretch" x:Name="selectFileButton" Click="selectFileButton_Click">Select File</Button>
+                <TextBlock Grid.Column="1" HorizontalAlignment="Stretch" VerticalAlignment="Center" x:Name="selectedFile">No file selected...</TextBlock>
+                <Button Grid.Column="2" HorizontalAlignment="Stretch" x:Name="playAudioFileButton" Click="playAudioFileButton_Click" IsEnabled="False">Play</Button>
+                <Button Grid.Column="3" HorizontalAlignment="Stretch" x:Name="fileTranscribeButton" Click="fileTranscribeButton_Click" IsEnabled="False">Transcribe</Button>
+            </Grid>
+            <Border Height="1" Margin="0 20" Background="#ddd"/>
+            <TextBlock Margin="0 0 0 10">Select an audio input:</TextBlock>
+            <Grid ColumnSpacing="10">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="100" />
+                    <ColumnDefinition Width="100" />
+                </Grid.ColumnDefinitions>
+                <ComboBox Grid.Column="0" HorizontalAlignment="Stretch" x:Name="inputDeviceList" SelectionChanged="inputDeviceList_SelectionChanged" />
+                <Button Grid.Column="1" HorizontalAlignment="Stretch" x:Name="recordButton" Click="recordButton_Click">Record</Button>
+                <Button Grid.Column="2" HorizontalAlignment="Stretch" x:Name="stopRecordButton" IsEnabled="False" Click="stopRecordButton_Click">Stop</Button>
+            </Grid>
+            <Border Height="1" Margin="0 20" Background="#ddd"/>
+            <TextBlock Margin="0 0 0 10" FontWeight="Bold">Results</TextBlock>
+        </StackPanel>
+        <TextBox Grid.Row="1" x:Name="result" TextWrapping="Wrap"  IsReadOnly="True" />
+        <TextBlock Grid.Row="2" x:Name="error" Margin="0 10 0 0" Foreground="Red" />
+    </Grid>
+</Page>

uwp/DeepSpeechUWP/MainPage.xaml.cs

@@ -0,0 +1,343 @@
+using DeepSpeechClient.Interfaces;
+using DeepSpeechClient.Models;
+using System;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using Windows.Devices.Enumeration;
+using Windows.Foundation;
+using Windows.Media;
+using Windows.Media.Audio;
+using Windows.Media.Capture;
+using Windows.Media.MediaProperties;
+using Windows.Media.Render;
+using Windows.Storage;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+
+namespace DeepSpeechUWP
+{
+    [ComImport]
+    [Guid("5B0D3235-4DBA-4D44-865E-8F1D0E4FD04D")]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    unsafe interface IMemoryBufferByteAccess
+    {
+        void GetBuffer(out byte* buffer, out uint capacity);
+    }
+
+    public sealed partial class MainPage : Page
+    {
+        private bool isFeeding = false;
+
+        private StorageFile audioFile;
+        private DeviceInformation selectedInputDevice;
+        private DeviceInformationCollection inputDevices;
+        private IDeepSpeech client;
+        private DeepSpeechStream stream;
+        private MediaEncodingProfile encoding;
+        private AudioGraph graph;
+
+        private ConcurrentQueue<short[]> bufferQueue = new ConcurrentQueue<short[]>();
+
+        public MainPage()
+        {
+            this.InitializeComponent();
+            InitDeepSpeech();
+            ListAudioInputDevices();
+            InitAudioGraph();
+        }
+
+        private async void InitAudioGraph()
+        {
+            try
+            {
+                await CreateAudioGraph();
+            }
+            catch (Exception exception)
+            {
+                error.Text = exception.Message;
+            }
+        }
+
+        private void InitDeepSpeech()
+        {
+            string projectFolder = Directory.GetCurrentDirectory();
+            string modelsFolder = Path.Combine(projectFolder, "models");
+            string acousticModelPath = Path.Combine(modelsFolder, "deepspeech-0.7.0-models.pbmm");
+            string scorerPath = Path.Combine(modelsFolder, "deepspeech-0.7.0-models.scorer");
+
+            client = new DeepSpeechClient.DeepSpeech(acousticModelPath);
+            client.EnableExternalScorer(scorerPath);
+        }
+
+        private async void ListAudioInputDevices()
+        {
+            inputDeviceList.Items.Clear();
+            inputDevices = await DeviceInformation.FindAllAsync(DeviceClass.AudioCapture);
+
+            foreach (var device in inputDevices)
+            {
+                inputDeviceList.Items.Add(device.Name);
+            }
+
+            inputDeviceList.SelectedIndex = 0;
+            selectedInputDevice = inputDevices[0];
+        }
+
+        private async Task ResetAudioGraph()
+        {
+            if (graph != null)
+            {
+                graph.Stop();
+                graph.Dispose();
+            }
+
+            await CreateAudioGraph();
+        }
+
+        private async Task CreateAudioGraph()
+        {
+            encoding = MediaEncodingProfile.CreateWav(AudioEncodingQuality.Low);
+            encoding.Audio = AudioEncodingProperties.CreatePcm(16000, 1, 16);
+
+            AudioGraphSettings settings = new AudioGraphSettings(AudioRenderCategory.Speech);
+            settings.EncodingProperties = encoding.Audio;
+            CreateAudioGraphResult result = await AudioGraph.CreateAsync(settings);
+
+            if (result.Status != AudioGraphCreationStatus.Success)
+            {
+                throw new Exception($"AudioGraph creation failed because {result.Status.ToString()}");
+            }
+
+            graph = result.Graph;
+
+            graph.UnrecoverableErrorOccurred += async (AudioGraph sender, AudioGraphUnrecoverableErrorOccurredEventArgs args) =>
+            {
+                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => { 
+                    error.Text = "Audio graph: UnrecoverableErrorOccurred"; 
+                });
+            };
+        }
+
+        private async Task<AudioFileInputNode> AttachFileInputNode(StorageFile file, TypedEventHandler<AudioFileInputNode, object> OnFileCompleted)
+        {
+            var fileInputNodeResult = await graph.CreateFileInputNodeAsync(file);
+            if (fileInputNodeResult.Status != AudioFileNodeCreationStatus.Success)
+            {
+                error.Text = String.Format("FileInputNode creation failed because {0}", fileInputNodeResult.Status.ToString());
+            }
+            var fileInputNode = fileInputNodeResult.FileInputNode;
+            fileInputNode.FileCompleted += OnFileCompleted;
+
+            return fileInputNode;
+        }
+
+        private async Task<AudioDeviceOutputNode> AttachDeviceOutputNode(IAudioInputNode inputNode)
+        {
+            var deviceOutputNodeResult = await graph.CreateDeviceOutputNodeAsync();
+            if (deviceOutputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
+            {
+                error.Text = String.Format("DeviceOutputNode creation failed because {0}", deviceOutputNodeResult.Status.ToString());
+            }
+            var deviceOutputNode = deviceOutputNodeResult.DeviceOutputNode;
+
+            inputNode.AddOutgoingConnection(deviceOutputNode);
+
+            return deviceOutputNode;
+        }
+
+        private short convertFloatToShort(float f)
+        {
+            float k = (float)0.0000305;
+            float y = f - (float)(Math.Floor(f * 128) / (float)128);
+            byte a = (byte)Math.Round(y / k);
+            float x = f - a * k;
+            byte b;
+
+            if (x > 0) b = (byte)(x * 128);
+            else if (x < 0) b = (byte)(256 + x * 128);
+            else b = 0;
+
+            short s = BitConverter.ToInt16(new byte[2] { a, b }, 0);
+            return s;
+        }
+
+        unsafe private void ProcessFrameOutput(AudioFrame frame)
+        {
+            using (AudioBuffer buffer = frame.LockBuffer(AudioBufferAccessMode.Read))
+            using (IMemoryBufferReference reference = buffer.CreateReference())
+            {
+                ((IMemoryBufferByteAccess)reference).GetBuffer(out byte* dataInBytes, out uint capacityInBytes);
+
+                if (capacityInBytes > 0)
+                {
+                    float* dataInFloats = (float*)dataInBytes;
+                    short[] shorts = new short[capacityInBytes / 4];
+
+                    for (int i = 0; i < capacityInBytes / 4; i++)
+                    {
+                        shorts[i] = convertFloatToShort(dataInFloats[i]);
+                    }
+
+                    bufferQueue.Enqueue(shorts);
+                }
+            }
+        }
+
+        private AudioFrameOutputNode AttachSpeechRecognitionMode(IAudioInputNode inputNode)
+        {
+            var speechRecognitionNode = graph.CreateFrameOutputNode(encoding.Audio);
+            graph.QuantumStarted += (AudioGraph sender, object args) =>
+            {
+                AudioFrame frame = speechRecognitionNode.GetFrame();
+                ProcessFrameOutput(frame);
+            };
+
+            inputNode.AddOutgoingConnection(speechRecognitionNode);
+            return speechRecognitionNode;
+        }
+
+        private void startSpeechRecognition()
+        {
+            isFeeding = true;
+            stream = client.CreateStream();
+            var feedCount = 0;
+            var decodeRate = 100; // decode every 100 feeds
+
+            Task.Run(async () =>
+            {
+                while (isFeeding || !bufferQueue.IsEmpty)
+                    if (!bufferQueue.IsEmpty && bufferQueue.TryDequeue(out short[] buffer))
+                    {
+                        client.FeedAudioContent(stream, buffer, Convert.ToUInt32(buffer.Length));
+
+                        if (++feedCount % decodeRate == 0)
+                        {
+                            var transcription = client.IntermediateDecode(stream);
+                            await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
+                            {
+                                result.Text = transcription;
+                            });
+                        }
+                    }
+            });
+        }
+
+        private async Task stopSpeechRecognition()
+        {
+            isFeeding = false;
+            while (!bufferQueue.IsEmpty) await Task.Delay(90);
+            var transcription = client.FinishStream(stream);
+
+            await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
+            {
+                result.Text = transcription;
+            });
+        }
+
+        private async Task<AudioDeviceInputNode> AttachDeviceInputNode()
+        {
+            var deviceInputNodeResult = await graph.CreateDeviceInputNodeAsync(MediaCategory.Speech, encoding.Audio, selectedInputDevice);
+
+            if (deviceInputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
+            {
+                error.Text = String.Format("DeviceInputNode creation failed because {0}", deviceInputNodeResult.Status.ToString());
+            }
+
+            var deviceInputNode = deviceInputNodeResult.DeviceInputNode;
+            return deviceInputNode;
+        }
+
+        private async void selectFileButton_Click(object sender, RoutedEventArgs e)
+        {
+            var picker = new Windows.Storage.Pickers.FileOpenPicker
+            {
+                ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail,
+                SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Downloads
+            };
+            picker.FileTypeFilter.Add(".wav");
+
+            audioFile = await picker.PickSingleFileAsync();
+            selectedFile.Text = audioFile.Path;
+
+            playAudioFileButton.IsEnabled = true;
+            transcribeAudioFileButton.IsEnabled = true;
+        }
+
+        private async void playAudioFileButton_Click(object sender, RoutedEventArgs e)
+        {
+            await ResetAudioGraph();
+
+            var fileInputNode = await AttachFileInputNode(audioFile, async (AudioFileInputNode senderNode, object args) =>
+            {
+                graph.Stop();
+                senderNode.Reset();
+                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
+                {
+                    playAudioFileButton.IsEnabled = true;
+                    transcribeAudioFileButton.IsEnabled = true;
+                });
+            });
+
+
+            await AttachDeviceOutputNode(fileInputNode);
+
+            graph.Start();
+            playAudioFileButton.IsEnabled = false;
+            transcribeAudioFileButton.IsEnabled = false;
+        }
+
+        private async void transcribeAudioFileButton_Click(object sender, RoutedEventArgs e)
+        {
+            await ResetAudioGraph();
+
+            var fileInputNode = await AttachFileInputNode(audioFile, async (AudioFileInputNode senderNode, object args) =>
+            {
+                graph.Stop();
+                senderNode.Reset();
+                await stopSpeechRecognition();
+                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
+                {
+                    playAudioFileButton.IsEnabled = true;
+                    transcribeAudioFileButton.IsEnabled = true;
+                });
+            });
+
+            var speechRecognitionNode = AttachSpeechRecognitionMode(fileInputNode);
+
+            startSpeechRecognition();
+            graph.Start();
+
+            playAudioFileButton.IsEnabled = false;
+            transcribeAudioFileButton.IsEnabled = false;
+        }
+
+        private async void recordButton_Click(object sender, RoutedEventArgs e)
+        {
+            await ResetAudioGraph();
+            var deviceInputNode = await AttachDeviceInputNode();
+            AttachSpeechRecognitionMode(deviceInputNode);
+
+            stopRecordButton.IsEnabled = true;
+            recordButton.IsEnabled = false;
+            
+            startSpeechRecognition();
+            graph.Start();
+        }
+        private async void stopRecordButton_Click(object sender, RoutedEventArgs e)
+        {
+            stopRecordButton.IsEnabled = false;
+            recordButton.IsEnabled = true;
+
+            graph.Stop();
+            await stopSpeechRecognition();
+        }
+
+        private void inputDeviceList_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            selectedInputDevice = inputDevices[inputDeviceList.SelectedIndex];
+        }
+    }
+}

uwp/DeepSpeechUWP/Package.appxmanifest

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  IgnorableNamespaces="uap mp">
+
+  <Identity
+    Name="a79d1931-db08-441d-b5ce-1c9cf6b1c8ff"
+    Publisher="CN=erikz"
+    Version="1.0.0.0" />
+
+  <mp:PhoneIdentity PhoneProductId="a79d1931-db08-441d-b5ce-1c9cf6b1c8ff" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
+
+  <Properties>
+    <DisplayName>DeepSpeechUWP</DisplayName>
+    <PublisherDisplayName>erikz</PublisherDisplayName>
+    <Logo>Assets\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.0.0" MaxVersionTested="10.0.0.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="DeepSpeechUWP.App">
+      <uap:VisualElements
+        DisplayName="DeepSpeechUWP"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png"
+        Description="DeepSpeechUWP"
+        BackgroundColor="transparent">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <Capability Name="internetClient" />
+    <DeviceCapability Name="microphone"/>
+  </Capabilities>
+</Package>

uwp/DeepSpeechUWP/Properties/AssemblyInfo.cs

@@ -0,0 +1,29 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("DeepSpeechUWP")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("DeepSpeechUWP")]
+[assembly: AssemblyCopyright("Copyright ©  2020")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: ComVisible(false)]

uwp/DeepSpeechUWP/Properties/Default.rd.xml

@@ -0,0 +1,31 @@
+<!--
+    This file contains Runtime Directives used by .NET Native. The defaults here are suitable for most
+    developers. However, you can modify these parameters to modify the behavior of the .NET Native
+    optimizer.
+
+    Runtime Directives are documented at https://go.microsoft.com/fwlink/?LinkID=391919
+
+    To fully enable reflection for App1.MyClass and all of its public/private members
+    <Type Name="App1.MyClass" Dynamic="Required All"/>
+
+    To enable dynamic creation of the specific instantiation of AppClass<T> over System.Int32
+    <TypeInstantiation Name="App1.AppClass" Arguments="System.Int32" Activate="Required Public" />
+
+    Using the Namespace directive to apply reflection policy to all the types in a particular namespace
+    <Namespace Name="DataClasses.ViewModels" Serialize="All" />
+-->
+
+<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
+  <Application>
+    <!--
+      An Assembly element with Name="*Application*" applies to all assemblies in
+      the application package. The asterisks are not wildcards.
+    -->
+    <Assembly Name="*Application*" Dynamic="Required All" />
+    
+    
+    <!-- Add your application specific runtime directives here. -->
+
+
+  </Application>
+</Directives>