Add meeting assistant speech and summary automation

MeetingAssistant/Transcription/WhisperLocalStreamingTranscriptionProvider.cs

@@ -20,6 +20,7 @@ public sealed class WhisperLocalStreamingTranscriptionProvider : IStreamingTrans
 
     public async IAsyncEnumerable<TranscriptionSegment> TranscribeAsync(
         IAsyncEnumerable<AudioChunk> audio,
+        SpeechRecognitionPipelineOptions pipelineOptions,
         [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken)
     {
         var modelPath = Path.GetFullPath(Environment.ExpandEnvironmentVariables(options.WhisperLocal.ModelPath));
@@ -29,9 +30,7 @@ public sealed class WhisperLocalStreamingTranscriptionProvider : IStreamingTrans
         }
 
         using var factory = WhisperFactory.FromPath(modelPath);
-        using var processor = factory.CreateBuilder()
-            .WithLanguage(options.WhisperLocal.Language)
-            .Build();
+        using var processor = CreateProcessor(factory, pipelineOptions.DictationWords);
 
         var window = new List<AudioChunk>();
         var windowDuration = TimeSpan.Zero;
@@ -119,6 +118,37 @@ public sealed class WhisperLocalStreamingTranscriptionProvider : IStreamingTrans
         }
     }
 
+    private WhisperProcessor CreateProcessor(
+        WhisperFactory factory,
+        IReadOnlyList<string>? dictationWords)
+    {
+        var builder = factory.CreateBuilder()
+            .WithLanguage(options.WhisperLocal.Language);
+        var prompt = BuildPrompt(dictationWords);
+        if (!string.IsNullOrWhiteSpace(prompt))
+        {
+            builder.WithPrompt(prompt)
+                .WithCarryInitialPrompt(true);
+            logger.LogInformation(
+                "Configured Whisper prompt with {WordCount} dictation word(s)",
+                dictationWords?.Count ?? 0);
+        }
+
+        return builder.Build();
+    }
+
+    internal static string BuildPrompt(IReadOnlyList<string>? dictationWords)
+    {
+        var words = (dictationWords ?? [])
+            .Select(word => word.Trim())
+            .Where(word => !string.IsNullOrWhiteSpace(word))
+            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .ToList();
+        return words.Count == 0
+            ? ""
+            : "Prefer these domain terms and acronyms: " + string.Join(", ", words) + ".";
+    }
+
     private static bool IsControlMarker(string text)
     {
         return text is "[BLANK_AUDIO]" or "[MUSIC]" or "[NO_SPEECH]" or "[SILENCE]";