WIP Voice recording

app/MindWork AI Studio/AudioRecorderHandler.cs

@@ -12,22 +12,54 @@ public static class AudioRecorderHandler
             .DisableAntiforgery();
     }
 
-    private static async Task<IResult> UploadAudio(IFormFile audio, RustService rustService)
+    private static async Task<IResult> UploadAudio(HttpRequest request, RustService rustService)
     {
-        if (audio.Length == 0)
-            return Results.BadRequest();
+        var form = await request.ReadFormAsync();
+        var file = form.Files.GetFile("audio");
+        var mimeType = form["mimeType"].ToString();
+        
+        if (file is null || file.Length == 0)
+            return Results.BadRequest("No audio file uploaded.");
 
+        var actualMimeType = !string.IsNullOrWhiteSpace(mimeType) 
+            ? mimeType 
+            : file.ContentType;
+    
+        var extension = GetFileExtension(actualMimeType);
+        
         var dataDirectory = await rustService.GetDataDirectory();
         var recordingDirectory = Path.Combine(dataDirectory, "audioRecordings");
         if(!Path.Exists(recordingDirectory))
             Directory.CreateDirectory(recordingDirectory);
         
-        var fileName = $"recording_{DateTime.UtcNow:yyyyMMdd_HHmmss}.webm";
+        var fileName = $"recording_{DateTime.UtcNow:yyyyMMdd_HHmmss}{extension}";
         var filePath = Path.Combine(recordingDirectory, fileName);
         
         await using var stream = File.Create(filePath);
-        await audio.CopyToAsync(stream);
+        await file.CopyToAsync(stream);
 
-        return Results.Ok(new { FileName = fileName });
+        return Results.Ok(new 
+        { 
+            FileName = fileName, 
+            MimeType = actualMimeType,
+            Size = file.Length 
+        });
+    }
+    
+    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/aac" => ".aac",
+            _ => ".audio"
+        };
     }
 }

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

@@ -1,6 +1,7 @@
 using AIStudio.Dialogs;
 using AIStudio.Settings;
 using AIStudio.Settings.DataModel;
+using AIStudio.Tools.MIME;
 using AIStudio.Tools.PluginSystem;
 using AIStudio.Tools.Rust;
 using AIStudio.Tools.Services;
@@ -353,28 +354,92 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, ILan
     {
         if (toggled)
         {
-            await this.JsRuntime.InvokeVoidAsync("audioRecorder.start");
+            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($"Starting audio recording with preferred MIME types: {string.Join<MIMEType>(", ", mimeTypes)}");
+            // var array = mimeTypes.ToStringArray().Cast<object?>().ToArray();
+            
+            var mimeTypeStrings = mimeTypes.ToStringArray();
+            await this.JsRuntime.InvokeVoidAsync("audioRecorder.start", (object)mimeTypeStrings);
             this.isRecording = true;
         }
         else
         {
-            var base64Audio = await this.JsRuntime.InvokeAsync<string>("audioRecorder.stop");
+            var result = await this.JsRuntime.InvokeAsync<AudioRecordingResult>("audioRecorder.stop");
+            if(result.ChangedMimeType)
+                this.Logger.LogWarning($"The recorded audio MIME type was changed to '{result.MimeType}'.");
+            
             this.isRecording = false;
             this.StateHasChanged();
-            
-            await this.SendAudioToBackend(base64Audio);
+
+            await this.SendAudioToBackend(result);
         }
     }
 
-    private async Task SendAudioToBackend(string base64Audio)
+    private static MIMEType[] GetPreferredMimeTypes(params MIMEType[] mimeTypes)
     {
-        var audioBytes = Convert.FromBase64String(base64Audio);
+        // 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 SendAudioToBackend(AudioRecordingResult recording)
+    {
+        #warning No need to send the recording to the backend (Blazor Hybrid)
+        var audioBytes = Convert.FromBase64String(recording.Data);
         
         using var content = new MultipartFormDataContent();
-        content.Add(new ByteArrayContent(audioBytes), "audio", "recording.webm");
-
+        var fileContent = new ByteArrayContent(audioBytes);
+        fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(recording.MimeType);
+        
+        var extension = GetFileExtension(recording.MimeType);
+        content.Add(fileContent, "audio", $"recording{extension}");
+        content.Add(new StringContent(recording.MimeType), "mimeType");
+        
         await this.HttpClient.PostAsync("/audio/upload", content);
     }
+    
+    private static string GetFileExtension(string mimeType)
+    {
+        // Codec-Parameter entfernen für Matching
+        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 Data { get; set; } = string.Empty;
+        public string MimeType { get; set; } = string.Empty;
+        public bool ChangedMimeType { get; set; }
+    }
 
     #region Implementation of IDisposable
 

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/wwwroot/app.js

@@ -29,11 +29,64 @@ window.scrollToBottom = function(element) {
 
 let mediaRecorder;
 let audioChunks = [];
+let actualRecordingMimeType;
+let changedMimeType = false;
 
 window.audioRecorder = {
-    start: async function () {
+    start: async function (desiredMimeTypes = []) {
         const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
-        mediaRecorder = new MediaRecorder(stream, { mimeType: 'audio/webm' });
+
+        // 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('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('Final mime types to check (included defaults):', mimeTypes);
+
+        // Find the first supported mime type:
+        actualRecordingMimeType = mimeTypes.find(type =>
+            type === '' || MediaRecorder.isTypeSupported(type)
+        ) || '';
+
+        console.log('Selected 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;
+        
+        // Check the list of desired mime types against the actual one:
+        if (!desiredMimeTypes.includes(actualRecordingMimeType)) {
+            changedMimeType = true;
+            console.warn(`Requested mime types ('${desiredMimeTypes.join(', ')}') do not include the actual mime type used by MediaRecorder ('${actualRecordingMimeType}').`);
+        } else {
+            changedMimeType = false;
+        }
+        
+        console.log('Actual mime type used by MediaRecorder:', actualRecordingMimeType);
+        
         audioChunks = [];
 
         mediaRecorder.ondataavailable = (event) => {
@@ -43,20 +96,24 @@ window.audioRecorder = {
         };
 
         mediaRecorder.start();
+        return actualRecordingMimeType;
     },
 
     stop: async function () {
         return new Promise((resolve) => {
             mediaRecorder.onstop = async () => {
-                const blob = new Blob(audioChunks, { type: 'audio/webm' });
+                const blob = new Blob(audioChunks, { type: actualRecordingMimeType });
                 const arrayBuffer = await blob.arrayBuffer();
                 const base64 = btoa(
                     new Uint8Array(arrayBuffer).reduce((data, byte) => data + String.fromCharCode(byte), '')
                 );
 
-                // Tracks stoppen, damit das Mic-Icon verschwindet
                 mediaRecorder.stream.getTracks().forEach(track => track.stop());
-                resolve(base64);
+                resolve({
+                    data: base64,
+                    mimeType: actualRecordingMimeType,
+                    changedMimeType: changedMimeType,
+                });
             };
             mediaRecorder.stop();
         });