Add HardwareAccelerationArgument

Former-commit-id: 5fb2305b5b

FFMpegCore.Test/ArgumentBuilderTest.cs

@@ -61,6 +61,19 @@ public void Builder_BuildString_BitStream()
             var str = FFMpegArguments.FromFileInput("input.mp4").OutputToFile("output.mp4", false, opt => opt.WithBitStreamFilter(Channel.Audio, Filter.H264_Mp4ToAnnexB)).Arguments;
             Assert.AreEqual("-i \"input.mp4\" -bsf:a h264_mp4toannexb \"output.mp4\"", str);
         }
+        
+        [TestMethod]
+        public void Builder_BuildString_HardwareAcceleration_Auto()
+        {
+            var str = FFMpegArguments.FromFileInput("input.mp4").OutputToFile("output.mp4", false, opt => opt.WithHardwareAcceleration()).Arguments;
+            Assert.AreEqual("-i \"input.mp4\" -hwaccel \"output.mp4\"", str);
+        }
+        [TestMethod]
+        public void Builder_BuildString_HardwareAcceleration_Specific()
+        {
+            var str = FFMpegArguments.FromFileInput("input.mp4").OutputToFile("output.mp4", false, opt => opt.WithHardwareAcceleration(HardwareAccelerationDevice.CUVID)).Arguments;
+            Assert.AreEqual("-i \"input.mp4\" -hwaccel cuvid \"output.mp4\"", str);
+        }
 
         [TestMethod]
         public void Builder_BuildString_Concat()

FFMpegCore/FFMpeg/Arguments/ForcePixelFormat.cs

@@ -4,7 +4,7 @@ namespace FFMpegCore.Arguments
 {
     public class ForcePixelFormat : IArgument
     {
-        public string PixelFormat { get; private set; }
+        public string PixelFormat { get; }
         public string Text => $"-pix_fmt {PixelFormat}";
 
         public ForcePixelFormat(string format)

FFMpegCore/FFMpeg/Arguments/HardwareAccelerationArgument.cs

@@ -0,0 +1,18 @@
+using FFMpegCore.Enums;
+
+namespace FFMpegCore.Arguments
+{
+    public class HardwareAccelerationArgument : IArgument
+    {
+        public HardwareAccelerationDevice HardwareAccelerationDevice { get; }
+
+        public HardwareAccelerationArgument(HardwareAccelerationDevice hardwareAccelerationDevice)
+        {
+            HardwareAccelerationDevice = hardwareAccelerationDevice;
+        }
+
+        public string Text => HardwareAccelerationDevice != HardwareAccelerationDevice.Auto
+            ? $"-hwaccel {HardwareAccelerationDevice.ToString().ToLower()}"
+            : "-hwaccel";
+    }
+}

FFMpegCore/FFMpeg/Enums/HardwareAccelerationDevice.cs

@@ -0,0 +1,14 @@
+namespace FFMpegCore.Enums
+{
+    public enum HardwareAccelerationDevice
+    {
+        Auto,
+        D3D11VA,
+        DXVA2,
+        QSV,
+        CUVID,
+        VDPAU,
+        VAAPI,
+        LibMFX
+    }
+}

FFMpegCore/FFMpeg/FFMpegArgumentOptions.cs

@@ -31,6 +31,7 @@ internal FFMpegArgumentOptions() { }
         public FFMpegArgumentOptions WithDuration(TimeSpan? duration) => WithArgument(new DurationArgument(duration));
         public FFMpegArgumentOptions WithFastStart() => WithArgument(new FaststartArgument());
         public FFMpegArgumentOptions WithFrameOutputCount(int frames) => WithArgument(new FrameOutputCountArgument(frames));
+        public FFMpegArgumentOptions WithHardwareAcceleration(HardwareAccelerationDevice hardwareAccelerationDevice = HardwareAccelerationDevice.Auto) => WithArgument(new HardwareAccelerationArgument(hardwareAccelerationDevice));
         
         public FFMpegArgumentOptions UsingShortest(bool shortest = true) => WithArgument(new ShortestArgument(shortest));
         public FFMpegArgumentOptions UsingMultithreading(bool multithread) => WithArgument(new ThreadsArgument(multithread));