Make meeting lifecycle stateful

MeetingAssistant/Transcription/AsrDiagnosticService.cs

@@ -12,20 +12,18 @@ public sealed class AsrDiagnosticService
         this.pipelineFactory = pipelineFactory;
     }
 
-    public async Task<AsrDiagnosticResult> TranscribeWavAsync(string path, CancellationToken cancellationToken)
+    public Task<AsrDiagnosticResult> TranscribeWavAsync(string path, CancellationToken cancellationToken)
     {
-        if (string.IsNullOrWhiteSpace(path))
-        {
-            throw new ArgumentException("A WAV file path is required.", nameof(path));
-        }
+        return TranscribeWavAsync(path, launchProfileName: null, cancellationToken);
+    }
 
-        var fullPath = Path.GetFullPath(Environment.ExpandEnvironmentVariables(path));
-        if (!File.Exists(fullPath))
-        {
-            throw new FileNotFoundException($"WAV file was not found at '{fullPath}'.", fullPath);
-        }
-
-        await using var pipeline = pipelineFactory.Create();
+    public async Task<AsrDiagnosticResult> TranscribeWavAsync(
+        string path,
+        string? launchProfileName,
+        CancellationToken cancellationToken)
+    {
+        var fullPath = ResolveExistingWavPath(path);
+        await using var pipeline = pipelineFactory.Create(launchProfileName);
         await pipeline.InitializeAsync(cancellationToken);
         var liveTranscriptTask = CollectLiveTranscriptAsync(pipeline, cancellationToken);
         await WriteWavToPipelineAsync(fullPath, pipeline, paceAudio: true, cancellationToken);
@@ -39,7 +37,17 @@ public sealed class AsrDiagnosticService
         CancellationToken cancellationToken)
     {
         var fullPath = ResolveExistingWavPath(path);
-        await using var pipeline = pipelineFactory.Create();
+        return await DiarizeWavAsync(fullPath, options, launchProfileName: null, cancellationToken);
+    }
+
+    public async Task<AsrDiagnosticResult> DiarizeWavAsync(
+        string path,
+        SpeechRecognitionPipelineOptions options,
+        string? launchProfileName,
+        CancellationToken cancellationToken)
+    {
+        var fullPath = ResolveExistingWavPath(path);
+        await using var pipeline = pipelineFactory.Create(launchProfileName);
         await pipeline.InitializeAsync(cancellationToken);
         var liveTranscriptTask = CollectLiveTranscriptAsync(pipeline, cancellationToken);
         await WriteWavToPipelineAsync(fullPath, pipeline, paceAudio: true, cancellationToken);
@@ -99,7 +107,9 @@ public sealed class AsrDiagnosticService
         string path,
         [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken = default)
     {
-        using var reader = new WaveFileReader(path);
+        var reader = new WaveFileReader(path);
+        try
+        {
         var format = reader.WaveFormat;
         if (format.Encoding != WaveFormatEncoding.Pcm || format.BitsPerSample != 16)
         {
@@ -113,6 +123,18 @@ public sealed class AsrDiagnosticService
         {
             yield return new AudioChunk(buffer[..read], format.SampleRate, format.Channels);
         }
+        }
+        finally
+        {
+            try
+            {
+                reader.Dispose();
+            }
+            catch (NotSupportedException)
+            {
+                // NAudio can throw while disposing reader streams from async iterators; diagnostics should not fail after reading all chunks.
+            }
+        }
     }
 }