更换为wpf

Spine/Exporters/FFmpegVideoExporter.cs

@@ -0,0 +1,146 @@
+using FFMpegCore;
+using FFMpegCore.Enums;
+using FFMpegCore.Pipes;
+using NLog;
+using SFML.Graphics;
+using SFML.System;
+using SkiaSharp;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Spine.Exporters
+{
+    /// <summary>
+    /// 基于 FFmpeg 命令行的导出类, 可以导出动图及视频格式
+    /// </summary>
+    public class FFmpegVideoExporter : VideoExporter
+    {
+        public FFmpegVideoExporter(uint width = 100, uint height = 100) : base(width, height) { }
+        public FFmpegVideoExporter(Vector2u resolution) : base(resolution) { }
+
+        /// <summary>
+        /// FFmpeg 导出格式
+        /// </summary>
+        public enum VideoFormat
+        {
+            Gif,
+            Webp,
+            Mp4,
+            Webm,
+            Mkv,
+        }
+
+        /// <summary>
+        /// 视频格式
+        /// </summary>
+        public VideoFormat Format { get => _format; set => _format = value; }
+        private VideoFormat _format = VideoFormat.Mp4;
+
+        /// <summary>
+        /// 动图是否循环
+        /// </summary>
+        public bool Loop { get => _loop; set => _loop = value; }
+        private bool _loop = true;
+
+        /// <summary>
+        /// 质量
+        /// </summary>
+        public int Quality { get => _quality; set => _quality = Math.Clamp(value, 0, 100); }
+        private int _quality = 75;
+
+        /// <summary>
+        /// CRF
+        /// </summary>
+        public int Crf { get => _crf; set => _crf = Math.Clamp(value, 0, 63); }
+        private int _crf = 23;
+
+        /// <summary>
+        /// 获取的一帧, 结果是预乘的
+        /// </summary>
+        protected override SFMLImageVideoFrame GetFrame(SpineObject[] spines)
+        {
+            // XXX: 不知道为什么用 FFmpeg 必须临时创建 RenderTexture, 否则无法正常渲染
+            using var tex = new RenderTexture(_renderTexture.Size.X, _renderTexture.Size.Y);
+            using var view = _renderTexture.GetView();
+            tex.SetView(view);
+            tex.Clear(_backgroundColorPma);
+            foreach (var sp in spines.Reverse()) tex.Draw(sp);
+            tex.Display();
+            return new(tex.Texture.CopyToImage());
+        }
+
+        public override void Export(string output, CancellationToken ct, params SpineObject[] spines)
+        {
+            var videoFramesSource = new RawVideoPipeSource(GetFrames(spines, output, ct)) { FrameRate = _fps };
+            Action<FFMpegArgumentOptions> setOutputOptions = _format switch
+            {
+                VideoFormat.Gif => SetGifOptions,
+                VideoFormat.Webp => SetWebpOptions,
+                VideoFormat.Mp4 => SetMp4Options,
+                VideoFormat.Webm => SetWebmOptions,
+                VideoFormat.Mkv => SetMkvOptions,
+                _ => throw new NotImplementedException(),
+            };
+
+            try
+            {
+                var ffmpegArgs = FFMpegArguments.FromPipeInput(videoFramesSource).OutputToFile(output, true, setOutputOptions);
+
+                _logger.Info("FFmpeg arguments: {0}", ffmpegArgs.Arguments);
+                ffmpegArgs.ProcessSynchronously();
+            }
+            catch (Exception ex)
+            {
+                _logger.Trace(ex.ToString());
+                _logger.Error("Failed to export {0} {1}, {2}", _format, output, ex.Message);
+            }
+        }
+
+        private void SetGifOptions(FFMpegArgumentOptions options)
+        {
+            // Gif 固定使用 256 调色板和 128 透明度阈值
+            var v = "split [s0][s1]";
+            var s0 = "[s0] palettegen=reserve_transparent=1:max_colors=256 [p]";
+            var s1 = "[s1][p] paletteuse=dither=bayer:alpha_threshold=128";
+            var customArgs = $"-vf \"unpremultiply=inplace=1, {v};{s0};{s1}\" -loop {(_loop ? 0 : -1)}";
+            options.ForceFormat("gif")
+                .WithCustomArgument(customArgs);
+        }
+
+        private void SetWebpOptions(FFMpegArgumentOptions options)
+        {
+            var customArgs = $"-vf unpremultiply=inplace=1 -quality {_quality} -loop {(_loop ? 0 : 1)}";
+            options.ForceFormat("webp").WithVideoCodec("libwebp_anim").ForcePixelFormat("yuva420p")
+                .WithCustomArgument(customArgs);
+        }
+
+        private void SetMp4Options(FFMpegArgumentOptions options)
+        {
+            var customArgs = "-vf unpremultiply=inplace=1";
+            options.ForceFormat("mp4").WithVideoCodec("libx264").ForcePixelFormat("yuv444p")
+                .WithFastStart()
+                .WithConstantRateFactor(_crf)
+                .WithCustomArgument(customArgs);
+        }
+
+        private void SetWebmOptions(FFMpegArgumentOptions options)
+        {
+            var customArgs = "-vf unpremultiply=inplace=1";
+            options.ForceFormat("webm").WithVideoCodec("libvpx-vp9").ForcePixelFormat("yuva420p")
+                .WithConstantRateFactor(_crf)
+                .WithCustomArgument(customArgs);
+        }
+
+        private void SetMkvOptions(FFMpegArgumentOptions options)
+        {
+            var customArgs = "-vf unpremultiply=inplace=1";
+            options.ForceFormat("matroska").WithVideoCodec("libx265").ForcePixelFormat("yuv444p")
+                .WithConstantRateFactor(_crf)
+                .WithCustomArgument(customArgs);
+        }
+
+    }
+}