gramps
e8ff4df05f
Adds AudioSyncOffsetMs (0..500ms, default 0) that delays the whole interleaved-stereo mix so audio lands on the video when it runs ahead — OBS's documented lip-sync fix. Positive-only: advancing audio needs a video-side delay and is out of the audio layer's scope. - Services/Audio/AudioSyncDelay.cs: pure delay line, flushed on Configure - AudioMixer: Func<int> syncOffsetMs seam + delay applied post-limiter - LayoutStore.Settings + MainViewModel.Audio/VM: load/save + binding - PreviewPane mic bar: SYNC slider + status dot (IntToSyncBrushConverter) - AudioSyncDelayTests: identity, negative/beyond-500 clamps, 10ms→960 samples Reference (external scan): https://obs-versions.com/blog/how-to-fix-audio-delay-on-obs (audio ahead => positive delay). Verified: build 0 warnings; 3/3 delay tests pass.
78 lines
2.2 KiB
C#
78 lines
2.2 KiB
C#
using Xunit;
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using ytLive.Services.Audio;
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namespace ytLive.Tests;
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/// <summary>
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/// TASK 22: the global audio-sync delay line. It is a pure fixed positive
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/// delay on the interleaved stereo mix — the OBS fix for audio running ahead
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/// of video. Positive-only: advancing audio needs a video-side delay and is
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/// out of the audio layer's scope.
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/// </summary>
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public class AudioSyncDelayTests
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{
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[Fact]
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public void ZeroDelay_PassesThroughUnchanged()
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{
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var delay = new AudioSyncDelay(48000);
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delay.Configure(0);
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var input = new float[16];
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for (var i = 0; i < input.Length; i++)
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input[i] = i - 8;
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var output = new float[16];
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delay.Process(input, output);
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Assert.Equal(input, output);
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}
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[Fact]
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public void ConfigureClampsNegativeToZero_AndBeyond500msTo500ms()
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{
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var delay = new AudioSyncDelay(48000);
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delay.Configure(-50);
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Assert.Equal(0, MarkerShift(delay, 1000));
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// 500 ms at 48 kHz = 24000 frames = 48000 interleaved samples.
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delay.Configure(6000);
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Assert.Equal(48000, MarkerShift(delay, 48000));
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}
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[Fact]
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public void TenMsDelay_EmitsTheSignal960SamplesLater()
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{
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// 10 ms at 48 kHz = 480 frames; interleaved stereo = 960 samples.
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var delay = new AudioSyncDelay(48000);
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Assert.Equal(960, MarkerShift(delay, 480 * 2, configureMs: 10));
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}
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private static int MarkerShift(AudioSyncDelay delay, int chunkLen, int configureMs = -1)
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{
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if (configureMs >= 0)
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delay.Configure(configureMs);
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var chunk = new float[chunkLen];
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var output = new float[chunkLen];
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chunk[0] = 1f; // sole non-zero: left of frame 0
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var foundAt = -1;
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var total = 0;
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for (var c = 0; c < 4 && foundAt < 0; c++)
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{
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delay.Process(chunk, output);
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for (var i = 0; i < chunkLen; i++)
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{
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if (output[i] != 0f)
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{
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foundAt = total + i;
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break;
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}
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}
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total += chunkLen;
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}
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Assert.True(foundAt >= 0, "marker never appeared in the delayed output");
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return foundAt;
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}
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}
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