TASK 21 slice 1 step 3: IMediaFrameSource + MediaVideoSourceManager
Refactor MediaVideoSource onto IMediaFrameSource (Key/FrameAvailable/Completed/ StartAsync/StopAsync, renaming Start->StartAsync, FrameReady->FrameAvailable), behavior preserved. Add MediaVideoSourceManager: app-wide decode-session owner refcounted by MediaPath with Func<string,IMediaFrameSource?> factory seam, Acquire/Release/ReleaseAll/GetLatestFrame, coalescing each file's frames onto the UI dispatcher onto one shared WriteableBitmap; MediaFailed + PreviewBitmapChanged. Mirrors ScreenCaptureManager (screen-capture session ownership + dispatcher coalescing), per the codebase precedent and derivative-work rule. Tests: MediaVideoSourceManagerTests (5 unit + 1 integration: single shared bitmap, coalesce-to-latest); MediaVideoSourceTests updated for renames. 10/10 media tests pass, build 0 warnings. Docs (TASKS/HANDOFF/ai.md) updated.
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using System.Threading;
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using System.Windows.Media.Imaging;
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using System.Windows.Threading;
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using Xunit;
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using ytLive.Services;
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namespace ytLive.Tests;
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/// <summary>
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/// MediaVideoSourceManager owns media-file decode sessions, refcounted by file
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/// path and coalesced onto the UI dispatcher — a structural mirror of
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/// ScreenCaptureManager. These tests pin that contract with a fake
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/// IMediaFrameSource (the real ffmpeg decode is exercised on Windows at runtime).
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/// </summary>
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public class MediaVideoSourceManagerTests
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{
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private sealed class FakeMediaSource : IMediaFrameSource
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{
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private readonly List<string>? _started;
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private readonly List<string>? _stopped;
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public string Key { get; }
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public event Action<VideoFrame>? FrameAvailable;
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public event Action? Completed;
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public FakeMediaSource(string key, List<string>? started = null, List<string>? stopped = null)
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{
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Key = key;
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_started = started;
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_stopped = stopped;
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}
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public Task StartAsync(CancellationToken cancellationToken = default)
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{
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_started?.Add(Key);
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return Task.CompletedTask;
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}
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public Task StopAsync()
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{
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_stopped?.Add(Key);
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return Task.CompletedTask;
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}
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public void Pump(VideoFrame frame) => FrameAvailable?.Invoke(frame);
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public void Complete() => Completed?.Invoke();
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public void Dispose() { }
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}
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private sealed class FailingMediaSource : IMediaFrameSource
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{
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public string Key { get; }
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public event Action<VideoFrame>? FrameAvailable;
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public event Action? Completed;
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public FailingMediaSource(string key) => Key = key;
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public Task StartAsync(CancellationToken cancellationToken = default)
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=> throw new InvalidOperationException("access denied");
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public Task StopAsync() => Task.CompletedTask;
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public void Pump(VideoFrame frame) => FrameAvailable?.Invoke(frame);
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public void Complete() => Completed?.Invoke();
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public void Dispose() { }
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}
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private sealed class DispatcherPump : IDisposable
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{
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private readonly Thread _thread;
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private readonly ManualResetEventSlim _ready = new(false);
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private Dispatcher? _dispatcher;
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public Dispatcher Dispatcher => _dispatcher!;
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public DispatcherPump()
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{
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_thread = new Thread(() =>
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{
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_dispatcher = Dispatcher.CurrentDispatcher;
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_ready.Set();
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Dispatcher.Run();
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});
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_thread.IsBackground = true;
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_thread.SetApartmentState(ApartmentState.STA);
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_thread.Start();
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_ready.Wait();
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}
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public void Drain() => Dispatcher.Invoke(() => { }, DispatcherPriority.ContextIdle);
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public void Dispose()
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{
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Dispatcher.InvokeShutdown();
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_thread.Join(3000);
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}
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}
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private static byte[] Pixels(params byte[] raw) => raw;
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[Fact]
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public async Task Refcount_TwoAcquires_OneDecoderUntilLastRelease()
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{
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var started = new List<string>();
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var stopped = new List<string>();
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var manager = new MediaVideoSourceManager(key => new FakeMediaSource(key, started, stopped));
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Assert.True(await manager.AcquireAsync(@"C:\videos\clip.mp4"));
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Assert.True(await manager.AcquireAsync(@"C:\videos\clip.mp4"));
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Assert.Single(started);
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await manager.ReleaseAsync(@"C:\videos\clip.mp4");
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Assert.Empty(stopped);
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await manager.ReleaseAsync(@"C:\videos\clip.mp4");
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Assert.Single(stopped);
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}
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[Fact]
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public async Task ReleaseAll_StopsEvenWithMultipleRefs()
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{
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var started = new List<string>();
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var stopped = new List<string>();
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var manager = new MediaVideoSourceManager(key => new FakeMediaSource(key, started, stopped));
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await manager.AcquireAsync(@"C:\videos\clip.mp4");
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await manager.AcquireAsync(@"C:\videos\clip.mp4");
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await manager.ReleaseAllAsync(@"C:\videos\clip.mp4");
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Assert.Single(stopped);
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}
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[Fact]
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public async Task Acquire_FailingSource_ReturnsFalseAndRaisesMediaFailed()
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{
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var manager = new MediaVideoSourceManager(key => new FailingMediaSource(key));
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string? failedKey = null;
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manager.MediaFailed += (key, _) => failedKey = key;
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Assert.False(await manager.AcquireAsync(@"C:\videos\clip.mp4"));
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Assert.Equal(@"C:\videos\clip.mp4", failedKey);
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}
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[Fact]
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public async Task Acquire_EmptyKey_ReturnsFalse()
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{
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var manager = new MediaVideoSourceManager(key => new FakeMediaSource(key));
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Assert.False(await manager.AcquireAsync(" "));
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}
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[Fact]
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public async Task GetLatestFrame_ReturnsLatestPump_UntilReleased()
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{
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FakeMediaSource? captured = null;
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var manager = new MediaVideoSourceManager(key => captured = new FakeMediaSource(key));
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Assert.Null(manager.GetLatestFrame(@"C:\videos\clip.mp4"));
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Assert.True(await manager.AcquireAsync(@"C:\videos\clip.mp4"));
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Assert.Null(manager.GetLatestFrame(@"C:\videos\clip.mp4"));
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var first = new VideoFrame(2, 2, Pixels(1, 0, 0, 255, 2, 0, 0, 255, 3, 0, 0, 255, 4, 0, 0, 255));
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var second = new VideoFrame(2, 2, Pixels(5, 0, 0, 255, 6, 0, 0, 255, 7, 0, 0, 255, 8, 0, 0, 255));
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captured!.Pump(first);
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captured.Pump(second);
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Assert.Same(second, manager.GetLatestFrame(@"C:\videos\clip.mp4"));
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await manager.ReleaseAsync(@"C:\videos\clip.mp4");
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Assert.Null(manager.GetLatestFrame(@"C:\videos\clip.mp4"));
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}
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// The one integration test for this branch: one file creates one shared
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// WriteableBitmap, published once, and back-to-back frames coalesce to the
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// latest (a single pending UI copy per session) — mirror of ScreenCapture.
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[Fact]
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public async Task Frames_ShareOneBitmap_AndCoalesceToLatest()
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{
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using var pump = new DispatcherPump();
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FakeMediaSource? captured = null;
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var manager = new MediaVideoSourceManager(key => captured = new FakeMediaSource(key), pump.Dispatcher);
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WriteableBitmap? published = null;
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var publishedCount = 0;
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manager.PreviewBitmapChanged += (_, bitmap) => { published = bitmap; publishedCount++; };
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Assert.True(await manager.AcquireAsync(@"C:\videos\clip.mp4"));
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var first = new VideoFrame(2, 2, Pixels(1, 0, 0, 255, 2, 0, 0, 255, 3, 0, 0, 255, 4, 0, 0, 255));
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captured!.Pump(first);
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pump.Drain();
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Assert.NotNull(published);
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Assert.Equal(1, publishedCount);
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var dims = pump.Dispatcher.Invoke(() => new[] { published!.PixelWidth, published.PixelHeight });
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Assert.Equal(new[] { 2, 2 }, dims);
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var second = new VideoFrame(2, 2, Pixels(5, 0, 0, 255, 6, 0, 0, 255, 7, 0, 0, 255, 8, 0, 0, 255));
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var third = new VideoFrame(2, 2, Pixels(9, 0, 0, 255, 10, 0, 0, 255, 11, 0, 0, 255, 12, 0, 0, 255));
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captured.Pump(second);
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captured.Pump(third);
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pump.Drain();
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var result = pump.Dispatcher.Invoke(() =>
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{
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var bytes = new byte[16];
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published!.CopyPixels(new System.Windows.Int32Rect(0, 0, 2, 2), bytes, 8, 0);
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return bytes;
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});
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Assert.Equal(third.BgraPixels, result);
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}
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}
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