fix windows compile

app/codec/ffmpeg/ffmpegdecoder.h

@@ -43,20 +43,6 @@ extern "C" {
 namespace olive
 {
 
-// 头文件里先备好枚举映射
-static VideoParams::Interlacing FFmpegFieldOrderToOlive(AVFieldOrder fo)
-{
-	switch (fo) {
-	case AV_FIELD_TT:          // 隔行，顶场在前
-		return VideoParams::kInterlacedTopFirst;
-	case AV_FIELD_BB:          // 隔行，底场在前
-		return VideoParams::kInterlacedBottomFirst;
-	case AV_FIELD_PROGRESSIVE:
-	default:
-		return VideoParams::kInterlaceNone;
-	}
-}
-
 /**
  * @brief A Decoder derivative that wraps FFmpeg functions as on Olive decoder
  */