ffplay: add support for various YUV conversion modes

SDL from version 2.0.8 has support for full range YUV and specifying
BT601/BT709 color space for YUV->RGB conversion.
Signed-off-by: Marton Balint <cus@passwd.hu>

fftools/ffplay.c

@@ -954,6 +954,22 @@ static int upload_texture(SDL_Texture **tex, AVFrame *frame, struct SwsContext *
     return ret;
 }
 
+static void set_sdl_yuv_conversion_mode(AVFrame *frame)
+{
+#if SDL_VERSION_ATLEAST(2,0,8)
+    SDL_YUV_CONVERSION_MODE mode = SDL_YUV_CONVERSION_AUTOMATIC;
+    if (frame && (frame->format == AV_PIX_FMT_YUV420P || frame->format == AV_PIX_FMT_YUYV422 || frame->format == AV_PIX_FMT_UYVY422)) {
+        if (frame->color_range == AVCOL_RANGE_JPEG)
+            mode = SDL_YUV_CONVERSION_JPEG;
+        else if (frame->colorspace == AVCOL_SPC_BT709)
+            mode = SDL_YUV_CONVERSION_BT709;
+        else if (frame->colorspace == AVCOL_SPC_BT470BG || frame->colorspace == AVCOL_SPC_SMPTE170M || frame->colorspace == AVCOL_SPC_SMPTE240M)
+            mode = SDL_YUV_CONVERSION_BT601;
+    }
+    SDL_SetYUVConversionMode(mode);
+#endif
+}
+
 static void video_image_display(VideoState *is)
 {
     Frame *vp;
@@ -1015,7 +1031,9 @@ static void video_image_display(VideoState *is)
         vp->flip_v = vp->frame->linesize[0] < 0;
     }
 
+    set_sdl_yuv_conversion_mode(vp->frame);
     SDL_RenderCopyEx(renderer, is->vid_texture, NULL, &rect, 0, NULL, vp->flip_v ? SDL_FLIP_VERTICAL : 0);
+    set_sdl_yuv_conversion_mode(NULL);
     if (sp) {
 #if USE_ONEPASS_SUBTITLE_RENDER
         SDL_RenderCopy(renderer, is->sub_texture, NULL, &rect);