Added audio recording (#615)

app/MindWork AI Studio.sln.DotSettings

@@ -6,6 +6,7 @@
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=GWDG/@EntryIndexedValue">GWDG</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HF/@EntryIndexedValue">HF</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=IERI/@EntryIndexedValue">IERI</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=IMIME/@EntryIndexedValue">IMIME</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=LLM/@EntryIndexedValue">LLM</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=LM/@EntryIndexedValue">LM</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=MSG/@EntryIndexedValue">MSG</s:String>
@@ -18,10 +19,12 @@
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=URL/@EntryIndexedValue">URL</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=I18N/@EntryIndexedValue">I18N</s:String>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=agentic/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=eri/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=groq/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=gwdg/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=huggingface/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=ieri/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=mime/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=mwais/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=ollama/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=tauri_0027s/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

app/MindWork AI Studio/Assistants/I18N/allTexts.lua

@@ -2323,6 +2323,12 @@ UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T428040679"] = "Content creation"
 -- Useful assistants
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T586430036"] = "Useful assistants"
 
+-- Stop recording and start transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T224155287"] = "Stop recording and start transcription"
+
+-- Start recording your voice for a transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T2372624045"] = "Start recording your voice for a transcription"
+
 -- Are you sure you want to delete the chat '{0}' in the workspace '{1}'?
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::WORKSPACES::T1016188706"] = "Are you sure you want to delete the chat '{0}' in the workspace '{1}'?"
 
@@ -5368,6 +5374,9 @@ UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T1848
 -- Plugins: Preview of our plugin system where you can extend the functionality of the app
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2056842933"] = "Plugins: Preview of our plugin system where you can extend the functionality of the app"
 
+-- Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text
+UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T221133923"] = "Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text"
+
 -- RAG: Preview of our RAG implementation where you can refer your files or integrate enterprise data within your company
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2708939138"] = "RAG: Preview of our RAG implementation where you can refer your files or integrate enterprise data within your company"
 

app/MindWork AI Studio/Chat/IImageSourceExtensions.cs

@@ -1,3 +1,4 @@
+using AIStudio.Tools.MIME;
 using AIStudio.Tools.PluginSystem;
 
 namespace AIStudio.Chat;
@@ -6,7 +7,7 @@ public static class IImageSourceExtensions
 {
     private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(IImageSourceExtensions).Namespace, nameof(IImageSourceExtensions));
     
-    public static string DetermineMimeType(this IImageSource image)
+    public static MIMEType DetermineMimeType(this IImageSource image)
     {
         switch (image.SourceType)
         {
@@ -18,13 +19,11 @@ public static class IImageSourceExtensions
                 {
                     var mimeEnd = base64Data.IndexOf(';');
                     if (mimeEnd > 5)
-                    {
+                        return Builder.FromTextRepresentation(base64Data[5..mimeEnd]);
-                        return base64Data[5..mimeEnd];
-                    }
                 }
 
                 // Fallback:
-                return "application/octet-stream";
+                return Builder.Create().UseApplication().UseSubtype(ApplicationSubtype.OCTET_STREAM).Build();
             }
 
             case ContentImageSource.URL:
@@ -32,38 +31,36 @@ public static class IImageSourceExtensions
                 // Try to detect the mime type from the URL extension:
                 var uri = new Uri(image.Source);
                 var extension = Path.GetExtension(uri.AbsolutePath).ToLowerInvariant();
-                return extension switch
+                return DeriveMIMETypeFromExtension(extension);
-                {
-                    ".png" => "image/png",
-                    ".jpg" or ".jpeg" => "image/jpeg",
-                    ".gif" => "image/gif",
-                    ".bmp" => "image/bmp",
-                    ".webp" => "image/webp",
-
-                    _ => "application/octet-stream"
-                };
             }
 
             case ContentImageSource.LOCAL_PATH:
             {
                 var extension = Path.GetExtension(image.Source).ToLowerInvariant();
-                return extension switch
+                return DeriveMIMETypeFromExtension(extension);
-                {
-                    ".png" => "image/png",
-                    ".jpg" or ".jpeg" => "image/jpeg",
-                    ".gif" => "image/gif",
-                    ".bmp" => "image/bmp",
-                    ".webp" => "image/webp",
-
-                    _ => "application/octet-stream"
-                };
             }
 
             default:
-                return "application/octet-stream";
+                return Builder.Create().UseApplication().UseSubtype(ApplicationSubtype.OCTET_STREAM).Build();
         }
     }
-    
+
+    private static MIMEType DeriveMIMETypeFromExtension(string extension)
+    {
+        var imageBuilder = Builder.Create().UseImage();
+        return extension switch
+        {
+            ".png" => imageBuilder.UseSubtype(ImageSubtype.PNG).Build(),
+            ".jpg" or ".jpeg" => imageBuilder.UseSubtype(ImageSubtype.JPEG).Build(),
+            ".gif" => imageBuilder.UseSubtype(ImageSubtype.GIF).Build(),
+            ".webp" => imageBuilder.UseSubtype(ImageSubtype.WEBP).Build(),
+            ".tiff" or ".tif" => imageBuilder.UseSubtype(ImageSubtype.TIFF).Build(),
+            ".heic" or ".heif" => imageBuilder.UseSubtype(ImageSubtype.HEIC).Build(),
+
+            _ => Builder.Create().UseApplication().UseSubtype(ApplicationSubtype.OCTET_STREAM).Build()
+        };
+    }
+
     /// <summary>
     /// Read the image content as a base64 string.
     /// </summary>

app/MindWork AI Studio/Components/VoiceRecorder.razor

@@ -0,0 +1,16 @@
+@using AIStudio.Settings.DataModel
+
+@namespace AIStudio.Components
+@inherits MSGComponentBase
+
+@if (PreviewFeatures.PRE_SPEECH_TO_TEXT_2026.IsEnabled(this.SettingsManager))
+{
+    <MudTooltip Text="@this.Tooltip">
+        <MudToggleIconButton Toggled="@this.isRecording"
+                             ToggledChanged="@this.OnRecordingToggled"
+                             Icon="@Icons.Material.Filled.Mic"
+                             ToggledIcon="@Icons.Material.Filled.Stop"
+                             Color="Color.Primary"
+                             ToggledColor="Color.Error"/>
+    </MudTooltip>
+}

app/MindWork AI Studio/Components/VoiceRecorder.razor.cs

@@ -0,0 +1,197 @@
+using AIStudio.Tools.MIME;
+using AIStudio.Tools.Services;
+
+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Components;
+
+public partial class VoiceRecorder : MSGComponentBase
+{
+    [Inject]
+    private ILogger<VoiceRecorder> Logger { get; init; } = null!;
+    
+    [Inject]
+    private IJSRuntime JsRuntime { get; init; } = null!;
+    
+    [Inject]
+    private RustService RustService { get; init; } = null!;
+
+    private uint numReceivedChunks;
+    private bool isRecording;
+    private FileStream? currentRecordingStream;
+    private string? currentRecordingPath;
+    private string? currentRecordingMimeType;
+    private DotNetObjectReference<VoiceRecorder>? dotNetReference;
+    
+    private string Tooltip => this.isRecording ? T("Stop recording and start transcription") : T("Start recording your voice for a transcription");
+    
+    private async Task OnRecordingToggled(bool toggled)
+    {
+        if (toggled)
+        {
+            var mimeTypes = GetPreferredMimeTypes(
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.OGG).Build(),
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.AAC).Build(),
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.MP3).Build(),
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.AIFF).Build(),
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.WAV).Build(),
+                Builder.Create().UseAudio().UseSubtype(AudioSubtype.FLAC).Build()
+            );
+
+            this.Logger.LogInformation("Starting audio recording with preferred MIME types: '{PreferredMimeTypes}'.", string.Join<MIMEType>(", ", mimeTypes));
+
+            // Create a DotNetObjectReference to pass to JavaScript:
+            this.dotNetReference = DotNetObjectReference.Create(this);
+
+            // Initialize the file stream for writing chunks:
+            await this.InitializeRecordingStream();
+
+            var mimeTypeStrings = mimeTypes.ToStringArray();
+            var actualMimeType = await this.JsRuntime.InvokeAsync<string>("audioRecorder.start", this.dotNetReference, mimeTypeStrings);
+
+            // Store the MIME type for later use:
+            this.currentRecordingMimeType = actualMimeType;
+
+            this.Logger.LogInformation("Audio recording started with MIME type: '{ActualMimeType}'.", actualMimeType);
+            this.isRecording = true;
+        }
+        else
+        {
+            var result = await this.JsRuntime.InvokeAsync<AudioRecordingResult>("audioRecorder.stop");
+            if (result.ChangedMimeType)
+                this.Logger.LogWarning("The recorded audio MIME type was changed to '{ResultMimeType}'.", result.MimeType);
+
+            // Close and finalize the recording stream:
+            await this.FinalizeRecordingStream();
+
+            this.isRecording = false;
+            this.StateHasChanged();
+        }
+    }
+
+    private static MIMEType[] GetPreferredMimeTypes(params MIMEType[] mimeTypes)
+    {
+        // Default list if no parameters provided:
+        if (mimeTypes.Length is 0)
+        {
+            var audioBuilder = Builder.Create().UseAudio();
+            return
+            [
+                audioBuilder.UseSubtype(AudioSubtype.WEBM).Build(),
+                audioBuilder.UseSubtype(AudioSubtype.OGG).Build(),
+                audioBuilder.UseSubtype(AudioSubtype.MP4).Build(),
+                audioBuilder.UseSubtype(AudioSubtype.MPEG).Build(),
+            ];
+        }
+
+        return mimeTypes;
+    }
+
+    private async Task InitializeRecordingStream()
+    {
+        this.numReceivedChunks = 0;
+        var dataDirectory = await this.RustService.GetDataDirectory();
+        var recordingDirectory = Path.Combine(dataDirectory, "audioRecordings");
+        if (!Directory.Exists(recordingDirectory))
+            Directory.CreateDirectory(recordingDirectory);
+
+        var fileName = $"recording_{DateTime.UtcNow:yyyyMMdd_HHmmss}.audio";
+        this.currentRecordingPath = Path.Combine(recordingDirectory, fileName);
+        this.currentRecordingStream = new FileStream(this.currentRecordingPath, FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: 8192, useAsync: true);
+
+        this.Logger.LogInformation("Initialized audio recording stream: '{RecordingPath}'.", this.currentRecordingPath);
+    }
+
+    [JSInvokable]
+    public async Task OnAudioChunkReceived(byte[] chunkBytes)
+    {
+        if (this.currentRecordingStream is null)
+        {
+            this.Logger.LogWarning("Received audio chunk but no recording stream is active.");
+            return;
+        }
+
+        try
+        {
+            this.numReceivedChunks++;
+            await this.currentRecordingStream.WriteAsync(chunkBytes);
+            await this.currentRecordingStream.FlushAsync();
+
+            this.Logger.LogDebug("Wrote {ByteCount} bytes to recording stream.", chunkBytes.Length);
+        }
+        catch (Exception ex)
+        {
+            this.Logger.LogError(ex, "Error writing audio chunk to stream.");
+        }
+    }
+
+    private async Task FinalizeRecordingStream()
+    {
+        if (this.currentRecordingStream is not null)
+        {
+            await this.currentRecordingStream.FlushAsync();
+            await this.currentRecordingStream.DisposeAsync();
+            this.currentRecordingStream = null;
+
+            // Rename the file with the correct extension based on MIME type:
+            if (this.currentRecordingPath is not null && this.currentRecordingMimeType is not null)
+            {
+                var extension = GetFileExtension(this.currentRecordingMimeType);
+                var newPath = Path.ChangeExtension(this.currentRecordingPath, extension);
+
+                if (File.Exists(this.currentRecordingPath))
+                {
+                    File.Move(this.currentRecordingPath, newPath, overwrite: true);
+                    this.Logger.LogInformation("Finalized audio recording over {NumChunks} streamed audio chunks to the file '{RecordingPath}'.", this.numReceivedChunks, newPath);
+                }
+            }
+        }
+
+        this.currentRecordingPath = null;
+        this.currentRecordingMimeType = null;
+
+        // Dispose the .NET reference:
+        this.dotNetReference?.Dispose();
+        this.dotNetReference = null;
+    }
+
+    private static string GetFileExtension(string mimeType)
+    {
+        var baseMimeType = mimeType.Split(';')[0].Trim().ToLowerInvariant();
+        return baseMimeType switch
+        {
+            "audio/webm" => ".webm",
+            "audio/ogg" => ".ogg",
+            "audio/mp4" => ".m4a",
+            "audio/mpeg" => ".mp3",
+            "audio/wav" => ".wav",
+            "audio/x-wav" => ".wav",
+            _ => ".audio" // Fallback
+        };
+    }
+
+    private sealed class AudioRecordingResult
+    {
+        public string MimeType { get; init; } = string.Empty;
+
+        public bool ChangedMimeType { get; init; }
+    }
+
+    #region Overrides of MSGComponentBase
+
+    protected override void DisposeResources()
+    {
+        // Clean up recording resources if still active:
+        if (this.currentRecordingStream is not null)
+        {
+            this.currentRecordingStream.Dispose();
+            this.currentRecordingStream = null;
+        }
+
+        this.dotNetReference?.Dispose();
+        this.dotNetReference = null;
+        base.DisposeResources();
+    }
+
+    #endregion
+}

app/MindWork AI Studio/Layout/MainLayout.razor

@@ -1,4 +1,6 @@
 @using AIStudio.Settings.DataModel
+@using AIStudio.Components
+
 @using Microsoft.AspNetCore.Components.Routing
 @using MudBlazor
 
@@ -20,12 +22,20 @@
                                 </MudNavLink>
                             }
                         </MudNavMenu>
+                        
+                        <MudSpacer/>
+                        
+                        <MudStack AlignItems="AlignItems.Center">
+                            <MudToolBar WrapContent="true">
+                                <VoiceRecorder />
+                            </MudToolBar>
+                        </MudStack>
                     </MudDrawer>
                 </MudDrawerContainer>
             }
             else
             {
-                <MudPaper Width="4em" Class="mud-height-full absolute">
+                <MudPaper Width="4em" Class="mud-height-full absolute" Style="display: flex; flex-direction: column;">
                     <MudNavMenu>
                         @foreach (var navBarItem in this.navItems)
                         {
@@ -41,6 +51,14 @@
                             }
                         }
                     </MudNavMenu>
+
+                    <MudSpacer/>
+
+                    <MudStack AlignItems="AlignItems.Center">
+                        <MudToolBar WrapContent="true">
+                            <VoiceRecorder />
+                        </MudToolBar>
+                    </MudStack>
                 </MudPaper>
             }
         }

app/MindWork AI Studio/Layout/MainLayout.razor.cs

@@ -341,7 +341,7 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
         await this.MessageBus.SendMessage<bool>(this, Event.COLOR_THEME_CHANGED);
         this.StateHasChanged();
     }
-
+    
     #region Implementation of IDisposable
 
     public void Dispose()

app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua

@@ -2325,6 +2325,12 @@ UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T428040679"] = "Erstellung von In
 -- Useful assistants
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T586430036"] = "Nützliche Assistenten"
 
+-- Stop recording and start transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T224155287"] = "Aufnahme beenden und Transkription starten"
+
+-- Start recording your voice for a transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T2372624045"] = "Beginnen Sie mit der Aufnahme Ihrer Stimme für eine Transkription"
+
 -- Are you sure you want to delete the chat '{0}' in the workspace '{1}'?
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::WORKSPACES::T1016188706"] = "Möchten Sie den Chat „{0}“ im Arbeitsbereich „{1}“ wirklich löschen?"
 
@@ -5370,6 +5376,9 @@ UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T1848
 -- Plugins: Preview of our plugin system where you can extend the functionality of the app
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2056842933"] = "Plugins: Vorschau auf unser Pluginsystems, mit dem Sie die Funktionalität der App erweitern können"
 
+-- Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text
+UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T221133923"] = "Sprache zu Text: Vorschau unseres Sprache-zu-Text-Systems, mit dem Sie Aufnahmen und Audiodateien in Text transkribieren können."
+
 -- RAG: Preview of our RAG implementation where you can refer your files or integrate enterprise data within your company
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2708939138"] = "RAG: Vorschau auf unsere RAG-Implementierung, mit der Sie auf ihre Dateien zugreifen oder Unternehmensdaten in ihrem Unternehmen integrieren können"
 

app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua

@@ -2325,6 +2325,12 @@ UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T428040679"] = "Content creation"
 -- Useful assistants
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VISION::T586430036"] = "Useful assistants"
 
+-- Stop recording and start transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T224155287"] = "Stop recording and start transcription"
+
+-- Start recording your voice for a transcription
+UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::VOICERECORDER::T2372624045"] = "Start recording your voice for a transcription"
+
 -- Are you sure you want to delete the chat '{0}' in the workspace '{1}'?
 UI_TEXT_CONTENT["AISTUDIO::COMPONENTS::WORKSPACES::T1016188706"] = "Are you sure you want to delete the chat '{0}' in the workspace '{1}'?"
 
@@ -5370,6 +5376,9 @@ UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T1848
 -- Plugins: Preview of our plugin system where you can extend the functionality of the app
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2056842933"] = "Plugins: Preview of our plugin system where you can extend the functionality of the app"
 
+-- Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text
+UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T221133923"] = "Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text"
+
 -- RAG: Preview of our RAG implementation where you can refer your files or integrate enterprise data within your company
 UI_TEXT_CONTENT["AISTUDIO::SETTINGS::DATAMODEL::PREVIEWFEATURESEXTENSIONS::T2708939138"] = "RAG: Preview of our RAG implementation where you can refer your files or integrate enterprise data within your company"
 

app/MindWork AI Studio/Program.cs

@@ -83,7 +83,6 @@ internal sealed class Program
         }
         
         var builder = WebApplication.CreateBuilder();
-        
         builder.WebHost.ConfigureKestrel(kestrelServerOptions =>
         {
             kestrelServerOptions.ConfigureEndpointDefaults(listenOptions =>

app/MindWork AI Studio/Settings/DataModel/PreviewFeatures.cs

@@ -12,4 +12,5 @@ public enum PreviewFeatures
     PRE_PLUGINS_2025,
     PRE_READ_PDF_2025,
     PRE_DOCUMENT_ANALYSIS_2025,
+    PRE_SPEECH_TO_TEXT_2026,
 }

app/MindWork AI Studio/Settings/DataModel/PreviewFeaturesExtensions.cs

@@ -14,6 +14,7 @@ public static class PreviewFeaturesExtensions
         PreviewFeatures.PRE_PLUGINS_2025 => TB("Plugins: Preview of our plugin system where you can extend the functionality of the app"),
         PreviewFeatures.PRE_READ_PDF_2025 => TB("Read PDF: Preview of our PDF reading system where you can read and extract text from PDF files"),
         PreviewFeatures.PRE_DOCUMENT_ANALYSIS_2025 => TB("Document Analysis: Preview of our document analysis system where you can analyze and extract information from documents"),
+        PreviewFeatures.PRE_SPEECH_TO_TEXT_2026 => TB("Speech to Text: Preview of our speech to text system where you can transcribe recordings and audio files into text"),
         
         _ => TB("Unknown preview feature")
     };

app/MindWork AI Studio/Settings/DataModel/PreviewVisibilityExtensions.cs

@@ -21,6 +21,7 @@ public static class PreviewVisibilityExtensions
         {
             features.Add(PreviewFeatures.PRE_RAG_2024);
             features.Add(PreviewFeatures.PRE_DOCUMENT_ANALYSIS_2025);
+            features.Add(PreviewFeatures.PRE_SPEECH_TO_TEXT_2026);
         }
         
         if (visibility >= PreviewVisibility.EXPERIMENTAL)

app/MindWork AI Studio/Tools/MIME/ApplicationBuilder.cs

@@ -0,0 +1,67 @@
+namespace AIStudio.Tools.MIME;
+
+public class ApplicationBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.APPLICATION;
+
+    private ApplicationBuilder()
+    {
+    }
+
+    public static ApplicationBuilder Create() => new();
+    
+    private ApplicationSubtype subtype;
+    
+    public ApplicationBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "vnd.ms-excel" => ApplicationSubtype.EXCEL_OLD,
+            "vnd.ms-word" => ApplicationSubtype.WORD_OLD,
+            "vnd.ms-powerpoint" => ApplicationSubtype.POWERPOINT_OLD,
+            
+            "vnd.openxmlformats-officedocument.spreadsheetml.sheet" => ApplicationSubtype.EXCEL,
+            "vnd.openxmlformats-officedocument.wordprocessingml.document" => ApplicationSubtype.WORD,
+            "vnd.openxmlformats-officedocument.presentationml.presentation" => ApplicationSubtype.POWERPOINT,
+            
+            "octet-stream" => ApplicationSubtype.OCTET_STREAM,
+            
+            "json" => ApplicationSubtype.JSON,
+            "xml" => ApplicationSubtype.XML,
+            "pdf" => ApplicationSubtype.PDF,
+            "zip" => ApplicationSubtype.ZIP,
+            
+            "x-www-form-urlencoded" => ApplicationSubtype.X_WWW_FORM_URLENCODED,
+            _ => throw new ArgumentOutOfRangeException(nameof(subType), "Unsupported MIME application subtype.")
+        };
+        
+        return this;
+    }
+    
+    public ApplicationBuilder UseSubtype(ApplicationSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = this.subtype switch
+        {
+            ApplicationSubtype.EXCEL_OLD => $"{BASE_TYPE}/vnd.ms-excel".ToLowerInvariant(),
+            ApplicationSubtype.WORD_OLD => $"{BASE_TYPE}/vnd.ms-word".ToLowerInvariant(),
+            ApplicationSubtype.POWERPOINT_OLD => $"{BASE_TYPE}/vnd.ms-powerpoint".ToLowerInvariant(),
+            
+            ApplicationSubtype.EXCEL => $"{BASE_TYPE}/vnd.openxmlformats-officedocument.spreadsheetml.sheet".ToLowerInvariant(),
+            ApplicationSubtype.WORD => $"{BASE_TYPE}/vnd.openxmlformats-officedocument.wordprocessingml.document".ToLowerInvariant(),
+            ApplicationSubtype.POWERPOINT => $"{BASE_TYPE}/vnd.openxmlformats-officedocument.presentationml.presentation".ToLowerInvariant(),
+            
+            _ => $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+        }
+    };
+
+    #endregion
+}

app/MindWork AI Studio/Tools/MIME/ApplicationSubtype.cs

@@ -0,0 +1,21 @@
+namespace AIStudio.Tools.MIME;
+
+public enum ApplicationSubtype
+{
+    OCTET_STREAM,
+    
+    JSON,
+    XML,
+    PDF,
+    ZIP,
+    X_WWW_FORM_URLENCODED,
+    
+    WORD_OLD,
+    WORD,
+    
+    EXCEL_OLD,
+    EXCEL,
+    
+    POWERPOINT_OLD,
+    POWERPOINT,
+}

app/MindWork AI Studio/Tools/MIME/AudioBuilder.cs

@@ -0,0 +1,51 @@
+namespace AIStudio.Tools.MIME;
+
+public class AudioBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.AUDIO;
+
+    private AudioBuilder()
+    {
+    }
+
+    public static AudioBuilder Create() => new();
+
+    private AudioSubtype subtype;
+
+    public AudioBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "mpeg" => AudioSubtype.MPEG,
+            "wav" => AudioSubtype.WAV,
+            "ogg" => AudioSubtype.OGG,
+            "aac" => AudioSubtype.AAC,
+            "flac" => AudioSubtype.FLAC,
+            "webm" => AudioSubtype.WEBM,
+            "mp4" => AudioSubtype.MP4,
+            "mp3" => AudioSubtype.MP3,
+            "m4a" => AudioSubtype.M4A,
+            "aiff" => AudioSubtype.AIFF,
+            
+            _ => throw new ArgumentException("Unsupported MIME audio subtype.", nameof(subType))
+        };
+        
+        return this;
+    }
+
+    public AudioBuilder UseSubtype(AudioSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+    };
+
+    #endregion
+}

app/MindWork AI Studio/Tools/MIME/AudioSubtype.cs

@@ -0,0 +1,16 @@
+namespace AIStudio.Tools.MIME;
+
+public enum AudioSubtype
+{
+    WAV,
+    MP3,
+    OGG,
+    AAC,
+    FLAC,
+    // ReSharper disable once InconsistentNaming
+    M4A,
+    MPEG,
+    MP4,
+    WEBM,
+    AIFF
+}

app/MindWork AI Studio/Tools/MIME/BaseType.cs

@@ -0,0 +1,10 @@
+namespace AIStudio.Tools.MIME;
+
+public enum BaseType
+{
+    APPLICATION,
+    AUDIO,
+    IMAGE,
+    VIDEO,
+    TEXT,
+}

app/MindWork AI Studio/Tools/MIME/Builder.cs

@@ -0,0 +1,58 @@
+namespace AIStudio.Tools.MIME;
+
+public class Builder
+{
+    private Builder()
+    {
+    }
+    
+    public static Builder Create() => new();
+    
+    public static MIMEType FromTextRepresentation(string textRepresentation)
+    {
+        var parts = textRepresentation.Split('/');
+        if (parts.Length != 2)
+            throw new ArgumentException("Invalid MIME type format.", nameof(textRepresentation));
+        
+        var baseType = parts[0].ToLowerInvariant();
+        var subType = parts[1].ToLowerInvariant();
+        
+        var builder = Create();
+
+        switch (baseType)
+        {
+            case "application":
+                var appBuilder = builder.UseApplication();
+                return appBuilder.UseSubtype(subType).Build();
+
+            case "text":
+                var textBuilder = builder.UseText();
+                return textBuilder.UseSubtype(subType).Build();
+            
+            case "audio":
+                var audioBuilder = builder.UseAudio();
+                return audioBuilder.UseSubtype(subType).Build();
+            
+            case "image":
+                var imageBuilder = builder.UseImage();
+                return imageBuilder.UseSubtype(subType).Build();
+            
+            case "video":
+                var videoBuilder = builder.UseVideo();
+                return videoBuilder.UseSubtype(subType).Build();
+            
+            default:
+                throw new ArgumentException("Unsupported base type.", nameof(textRepresentation));
+        }
+    }
+    
+    public ApplicationBuilder UseApplication() => ApplicationBuilder.Create();
+
+    public TextBuilder UseText() => TextBuilder.Create();
+
+    public AudioBuilder UseAudio() => AudioBuilder.Create();
+
+    public ImageBuilder UseImage() => ImageBuilder.Create();
+
+    public VideoBuilder UseVideo() => VideoBuilder.Create();
+}

app/MindWork AI Studio/Tools/MIME/ISubtype.cs

@@ -0,0 +1,6 @@
+namespace AIStudio.Tools.MIME;
+
+public interface ISubtype
+{
+    public MIMEType Build();
+}

app/MindWork AI Studio/Tools/MIME/ImageBuilder.cs

@@ -0,0 +1,48 @@
+namespace AIStudio.Tools.MIME;
+
+public class ImageBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.IMAGE;
+
+    private ImageBuilder()
+    {
+    }
+
+    public static ImageBuilder Create() => new();
+
+    private ImageSubtype subtype;
+
+    public ImageBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "jpeg" or "jpg" => ImageSubtype.JPEG,
+            "png" => ImageSubtype.PNG,
+            "gif" => ImageSubtype.GIF,
+            "webp" => ImageSubtype.WEBP,
+            "tiff" or "tif" => ImageSubtype.TIFF,
+            "svg+xml" or "svg" => ImageSubtype.SVG,
+            "heic" => ImageSubtype.HEIC,
+            
+            _ => throw new ArgumentException("Unsupported MIME image subtype.", nameof(subType))
+        };
+
+        return this;
+    }
+
+    public ImageBuilder UseSubtype(ImageSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+    };
+
+    #endregion
+}

app/MindWork AI Studio/Tools/MIME/ImageSubtype.cs

@@ -0,0 +1,12 @@
+namespace AIStudio.Tools.MIME;
+
+public enum ImageSubtype
+{
+    JPEG,
+    PNG,
+    GIF,
+    TIFF,
+    WEBP,
+    SVG,
+    HEIC,
+}

app/MindWork AI Studio/Tools/MIME/MIMEType.cs

@@ -0,0 +1,16 @@
+namespace AIStudio.Tools.MIME;
+
+public record MIMEType
+{
+    public required ISubtype Type { get; init; }
+    
+    public required string TextRepresentation { get; init; }
+
+    #region Overrides of Object
+
+    public override string ToString() => this.TextRepresentation;
+
+    #endregion
+    
+    public static implicit operator string(MIMEType mimeType) => mimeType.TextRepresentation;
+}

app/MindWork AI Studio/Tools/MIME/MIMETypeExtensions.cs

@@ -0,0 +1,15 @@
+namespace AIStudio.Tools.MIME;
+
+public static class MIMETypeExtensions
+{
+    public static string[] ToStringArray(this MIMEType[] mimeTypes)
+    {
+        var result = new string[mimeTypes.Length];
+        for (var i = 0; i < mimeTypes.Length; i++)
+        {
+            result[i] = mimeTypes[i];
+        }
+        
+        return result;
+    }
+}

app/MindWork AI Studio/Tools/MIME/TextBuilder.cs

@@ -0,0 +1,49 @@
+namespace AIStudio.Tools.MIME;
+
+public class TextBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.TEXT;
+
+    private TextBuilder()
+    {
+    }
+
+    public static TextBuilder Create() => new();
+    
+    private TextSubtype subtype;
+
+    public TextBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "plain" => TextSubtype.PLAIN,
+            "html" => TextSubtype.HTML,
+            "css" => TextSubtype.CSS,
+            "csv" => TextSubtype.CSV,
+            "javascript" => TextSubtype.JAVASCRIPT,
+            "xml" => TextSubtype.XML,
+            "markdown" => TextSubtype.MARKDOWN,
+            "json" => TextSubtype.JSON,
+            
+            _ => throw new ArgumentException("Unsupported MIME text subtype.", nameof(subType))
+        };
+        
+        return this;
+    }
+
+    public TextBuilder UseSubtype(TextSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+    };
+
+    #endregion
+}

app/MindWork AI Studio/Tools/MIME/TextSubtype.cs

@@ -0,0 +1,13 @@
+namespace AIStudio.Tools.MIME;
+
+public enum TextSubtype
+{
+    PLAIN,
+    HTML,
+    CSS,
+    CSV,
+    JAVASCRIPT,
+    XML,
+    JSON,
+    MARKDOWN,
+}

app/MindWork AI Studio/Tools/MIME/VideoBuilder.cs

@@ -0,0 +1,46 @@
+namespace AIStudio.Tools.MIME;
+
+public class VideoBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.VIDEO;
+
+    private VideoBuilder()
+    {
+    }
+
+    public static VideoBuilder Create() => new();
+    
+    private VideoSubtype subtype;
+
+    public VideoBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "mp4" => VideoSubtype.MP4,
+            "webm" => VideoSubtype.WEBM,
+            "avi" => VideoSubtype.AVI,
+            "mov" => VideoSubtype.MOV,
+            "mkv" => VideoSubtype.MKV,
+            
+            _ => throw new ArgumentException("Unsupported MIME video subtype.", nameof(subType))
+        };
+
+        return this;
+    }
+
+    public VideoBuilder UseSubtype(VideoSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+    };
+
+    #endregion
+}

app/MindWork AI Studio/Tools/MIME/VideoSubtype.cs

@@ -0,0 +1,11 @@
+namespace AIStudio.Tools.MIME;
+
+public enum VideoSubtype
+{
+    MP4,
+    AVI,
+    MOV,
+    MKV,
+    WEBM,
+    MPEG,
+}

app/MindWork AI Studio/wwwroot/app.js

@@ -25,4 +25,133 @@ window.clearDiv = function (divName) {
 
 window.scrollToBottom = function(element) {
     element.scrollIntoView({ behavior: 'smooth', block: 'end', inline: 'nearest' });
-}
+}
+
+let mediaRecorder;
+let actualRecordingMimeType;
+let changedMimeType = false;
+let pendingChunkUploads = 0;
+
+window.audioRecorder = {
+    playSound: function(soundPath) {
+        try {
+            const audio = new Audio(soundPath);
+            audio.play().catch(error => {
+                console.warn('Failed to play sound effect:', error);
+            });
+        } catch (error) {
+            console.warn('Error creating audio element:', error);
+        }
+    },
+
+    start: async function (dotnetRef, desiredMimeTypes = []) {
+        const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+
+        // Play start recording sound effect:
+        this.playSound('/sounds/start_recording.ogg');
+
+        // When only one mime type is provided as a string, convert it to an array:
+        if (typeof desiredMimeTypes === 'string') {
+            desiredMimeTypes = [desiredMimeTypes];
+        }
+        
+        // Log sent mime types for debugging:
+        console.log('Audio recording - requested mime types: ', desiredMimeTypes);
+
+        let mimeTypes = desiredMimeTypes.filter(type => typeof type === 'string' && type.trim() !== '');
+        
+        // Next, we have to ensure that we have some default mime types to check as well.
+        // In case the provided list does not contain these, we append them:
+        // Use provided mime types or fallback to a default list:
+        const defaultMimeTypes = [
+            'audio/webm',
+            'audio/ogg',
+            'audio/mp4',
+            'audio/mpeg',
+            ''// Fallback to browser default
+        ];
+        
+        defaultMimeTypes.forEach(type => {
+            if (!mimeTypes.includes(type)) {
+                mimeTypes.push(type);
+            }
+        });
+        
+        console.log('Audio recording - final mime types to check (included defaults): ', mimeTypes);
+
+        // Find the first supported mime type:
+        actualRecordingMimeType = mimeTypes.find(type =>
+            type === '' || MediaRecorder.isTypeSupported(type)
+        ) || '';
+
+        console.log('Audio recording - the browser selected the following mime type for recording: ', actualRecordingMimeType);
+        const options = actualRecordingMimeType ? { mimeType: actualRecordingMimeType } : {};
+        mediaRecorder = new MediaRecorder(stream, options);
+
+        // In case the browser changed the mime type:
+        actualRecordingMimeType = mediaRecorder.mimeType;
+        console.log('Audio recording - actual mime type used by the browser: ', actualRecordingMimeType);
+        
+        // Check the list of desired mime types against the actual one:
+        if (!desiredMimeTypes.includes(actualRecordingMimeType)) {
+            changedMimeType = true;
+            console.warn(`Audio recording - requested mime types ('${desiredMimeTypes.join(', ')}') do not include the actual mime type used by the browser ('${actualRecordingMimeType}').`);
+        } else {
+            changedMimeType = false;
+        }
+
+        // Reset the pending uploads counter:
+        pendingChunkUploads = 0;
+
+        // Stream each chunk directly to .NET as it becomes available:
+        mediaRecorder.ondataavailable = async (event) => {
+            if (event.data.size > 0) {
+                pendingChunkUploads++;
+                try {
+                    const arrayBuffer = await event.data.arrayBuffer();
+                    const uint8Array = new Uint8Array(arrayBuffer);
+                    await dotnetRef.invokeMethodAsync('OnAudioChunkReceived', uint8Array);
+                } catch (error) {
+                    console.error('Error sending audio chunk to .NET:', error);
+                } finally {
+                    pendingChunkUploads--;
+                }
+            }
+        };
+
+        mediaRecorder.start(3000); // read the recorded data in 3-second chunks
+        return actualRecordingMimeType;
+    },
+
+    stop: async function () {
+        return new Promise((resolve) => {
+            
+            // Add an event listener to handle the stop event:
+            mediaRecorder.onstop = async () => {
+
+                // Wait for all pending chunk uploads to complete before finalizing:
+                console.log(`Audio recording - waiting for ${pendingChunkUploads} pending uploads.`);
+                while (pendingChunkUploads > 0) {
+                    await new Promise(r => setTimeout(r, 10)); // wait 10 ms before checking again
+                }
+                
+                console.log('Audio recording - all chunks uploaded, finalizing.');
+
+                // Play stop recording sound effect:
+                window.audioRecorder.playSound('/sounds/stop_recording.ogg');
+
+                // Stop all tracks to release the microphone:
+                mediaRecorder.stream.getTracks().forEach(track => track.stop());
+                
+                // No need to process data here anymore, just signal completion:
+                resolve({
+                    mimeType: actualRecordingMimeType,
+                    changedMimeType: changedMimeType,
+                });
+            };
+            
+            // Finally, stop the recording (which will actually trigger the onstop event):
+            mediaRecorder.stop();
+        });
+    }
+};

app/MindWork AI Studio/wwwroot/changelog/v26.1.1.md

@@ -1,4 +1,5 @@
 # v26.1.1, build 231 (2026-01-xx xx:xx UTC)
 - Added the option to attach files, including images, to chat templates. You can also define templates with file attachments through a configuration plugin. These file attachments aren’t copied—they’re re-read every time. That means the AI will pick up any updates you make to those files.
 - Added the option to use source code files in chats and document analysis. This supports software development workflows.
+- Added a preview feature that lets you record your own voice in preparation for the transcription feature. The feature remains in development and appears only when the preview feature is enabled.
 - Improved the app versioning. Starting in 2026, each version number includes the year, followed by the month. The last digit shows the release number for that month. For example, version `26.1.1` is the first release in January 2026.

runtime/Info.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSMicrophoneUsageDescription</key>
+	<string>Request microphone access for voice recording</string>
+</dict>
+</plist>