Archive completed meeting assistant changes

MeetingAssistant/Transcription/AsrDiagnosticService.cs

@@ -1,5 +1,4 @@
 using MeetingAssistant.Recording;
-using NAudio.Wave;
 
 namespace MeetingAssistant.Transcription;
 
@@ -77,7 +76,7 @@ public sealed class AsrDiagnosticService
         bool paceAudio,
         CancellationToken cancellationToken)
     {
-        await foreach (var chunk in ReadPcmWavChunks(fullPath, cancellationToken))
+        await foreach (var chunk in PcmWavAudioChunkReader.ReadChunksAsync(fullPath, cancellationToken: cancellationToken))
         {
             await pipeline.WriteAsync(chunk, cancellationToken);
             if (paceAudio && chunk.Duration > TimeSpan.Zero)
@@ -102,40 +101,6 @@ public sealed class AsrDiagnosticService
 
         return fullPath;
     }
-
-    private static async IAsyncEnumerable<AudioChunk> ReadPcmWavChunks(
-        string path,
-        [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken = default)
-    {
-        var reader = new WaveFileReader(path);
-        try
-        {
-        var format = reader.WaveFormat;
-        if (format.Encoding != WaveFormatEncoding.Pcm || format.BitsPerSample != 16)
-        {
-            throw new InvalidDataException(
-                $"Only 16-bit PCM WAV files are supported. Found {format.Encoding} with {format.BitsPerSample} bits per sample.");
-        }
-
-        var buffer = new byte[format.AverageBytesPerSecond];
-        int read;
-        while ((read = await reader.ReadAsync(buffer.AsMemory(0, buffer.Length), cancellationToken)) > 0)
-        {
-            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.
-            }
-        }
-    }
 }
 
 public sealed record AsrDiagnosticResult(string Path, IReadOnlyList<TranscriptionSegment> Segments);