Add meeting assistant speech and summary automation

2026-05-21 09:55:39 +02:00
parent 1e97d2b9ff
commit 48d98d9cbb
63 changed files with 5143 additions and 151 deletions
@@ -0,0 +1,49 @@
+using MeetingAssistant.Transcription;
+using NAudio.Wave;
+
+namespace MeetingAssistant.Speakers;
+
+public sealed class WavSpeakerSnippetExtractor : ISpeakerSnippetExtractor
+{
+    public Task<byte[]> ExtractSnippetAsync(
+        string audioPath,
+        IReadOnlyList<TranscriptionSegment> speakerSegments,
+        CancellationToken cancellationToken)
+    {
+        if (speakerSegments.Count == 0 || !File.Exists(audioPath))
+        {
+            return Task.FromResult<byte[]>([]);
+        }
+
+        var start = speakerSegments.Min(segment => segment.Start);
+        var end = speakerSegments.Max(segment => segment.End);
+        if (end <= start)
+        {
+            return Task.FromResult<byte[]>([]);
+        }
+
+        using var reader = new WaveFileReader(audioPath);
+        using var output = new MemoryStream();
+        using (var writer = new WaveFileWriter(output, reader.WaveFormat))
+        {
+            reader.CurrentTime = start;
+            var bytesRemaining = reader.WaveFormat.AverageBytesPerSecond * (end - start).TotalSeconds;
+            var buffer = new byte[reader.WaveFormat.AverageBytesPerSecond];
+            while (bytesRemaining > 0)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                var bytesToRead = (int)Math.Min(buffer.Length, bytesRemaining);
+                var bytesRead = reader.Read(buffer, 0, bytesToRead);
+                if (bytesRead == 0)
+                {
+                    break;
+                }
+
+                writer.Write(buffer, 0, bytesRead);
+                bytesRemaining -= bytesRead;
+            }
+        }
+
+        return Task.FromResult(output.ToArray());
+    }
+}