feat: refactor audio extraction to reusable class

src/StreamShorts.Library/Media/Audio/IAudioExtractor.cs

@@ -0,0 +1,19 @@
+namespace StreamShorts.Library.Media.Audio;
+
+/// <summary>
+/// Represents an interface for extracting audio from video streams.
+/// </summary>
+public interface IAudioExtractor
+{
+  /// <summary>
+  /// Extracts MP3 audio from an MP4 video stream.
+  /// </summary>
+  /// <param name="video">The input video stream.</param>
+  /// <returns>A stream containing the extracted MP3 audio.</returns>
+  /// <exception cref="ArgumentNullException">Thrown when the video stream is null.</exception>
+  /// <exception cref="ArgumentException">Thrown when the video stream is not readable.</exception>
+  /// <exception cref="ArgumentException">Thrown when the video stream is not seekable.</exception>
+  /// <exception cref="FailedAudioExtractionException">Thrown when the audio extraction fails.</exception>
+  /// <remarks>The method will preserve the passed video stream's data and position.</remarks>
+  Task<Stream> ExtractMp3FromMp4Async(Stream video);
+}