Archive completed meeting assistant changes

2026-06-26 13:15:47 +02:00
parent 7d16b0cad7
commit aecef30627
72 changed files with 2914 additions and 406 deletions
@@ -0,0 +1,48 @@
+using System.Runtime.CompilerServices;
+using NAudio.Wave;
+
+namespace MeetingAssistant.Recording;
+
+public static class PcmWavAudioChunkReader
+{
+    private const int MaxChunkDurationMilliseconds = 1000;
+
+    public static async IAsyncEnumerable<AudioChunk> ReadChunksAsync(
+        string path,
+        [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 chunkSize = Math.Max(
+                format.BlockAlign,
+                format.AverageBytesPerSecond * MaxChunkDurationMilliseconds / 1000);
+            chunkSize -= chunkSize % format.BlockAlign;
+
+            var buffer = new byte[chunkSize];
+            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 after all chunks were read.
+            }
+        }
+    }
+}