feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Core/MediaPlaybackSpeedPitchGateTests.cs

@@ -0,0 +1,70 @@
+using System;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class MediaPlaybackSpeedPitchGateTests
+{
+    [Fact]
+    public void Gate341_MediaPlaybackSpeedPitch_BuildsSingleAtempo_ForNormalRange()
+    {
+        var filter15 = MediaPlaybackSpeedPitchEngine.BuildAtempoFilterChain(1.5);
+        Assert.Equal("atempo=1.50", filter15);
+
+        var filter075 = MediaPlaybackSpeedPitchEngine.BuildAtempoFilterChain(0.75);
+        Assert.Equal("atempo=0.75", filter075);
+    }
+
+    [Fact]
+    public void Gate342_MediaPlaybackSpeedPitch_ChainsAtempo_ForSpeedsExceedingTwo()
+    {
+        // 3.0x -> atempo=2.0,atempo=1.5
+        var filter30 = MediaPlaybackSpeedPitchEngine.BuildAtempoFilterChain(3.0);
+        Assert.Equal("atempo=2.00,atempo=1.50", filter30);
+
+        // 4.0x -> atempo=2.0,atempo=2.0
+        var filter40 = MediaPlaybackSpeedPitchEngine.BuildAtempoFilterChain(4.0);
+        Assert.Equal("atempo=2.00,atempo=2.00", filter40);
+    }
+
+    [Fact]
+    public void Gate343_MediaPlaybackSpeedPitch_ClampsExtremeSpeeds()
+    {
+        // Min 0.25
+        var min = MediaPlaybackSpeedPitchEngine.ClampSpeed(0.1);
+        Assert.Equal(0.25, min);
+
+        // Max 4.0
+        var max = MediaPlaybackSpeedPitchEngine.ClampSpeed(10.0);
+        Assert.Equal(4.0, max);
+    }
+
+    [Fact]
+    public void Gate344_MediaPlaybackSpeedPitch_BuildsFullCommandLine_ForVideoAndAudio()
+    {
+        // Video 1.5x
+        var videoCmd = MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(
+            inputPath: "C:\\lecture.mp4",
+            outputPath: "C:\\lecture_1.5x.mp4",
+            speed: 1.5,
+            isAudioOnly: false
+        );
+
+        Assert.Contains("-i \"C:\\lecture.mp4\"", videoCmd);
+        Assert.Contains("-filter:v \"setpts=0.6667*PTS\"", videoCmd);
+        Assert.Contains("-filter:a \"atempo=1.50\"", videoCmd);
+        Assert.EndsWith("\"C:\\lecture_1.5x.mp4\" -y", videoCmd);
+
+        // Audio only 2.0x
+        var audioCmd = MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(
+            inputPath: "C:\\podcast.mp3",
+            outputPath: "C:\\podcast_2x.mp3",
+            speed: 2.0,
+            isAudioOnly: true
+        );
+
+        Assert.DoesNotContain("-filter:v", audioCmd);
+        Assert.Contains("-filter:a \"atempo=2.00\"", audioCmd);
+    }
+}