d3d11_fmt: add a helper function to find the actual picture_sys_t to use

the decoder and filters fill context but the vout uses picture_sys_t by default
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/video_chroma/d3d11_fmt.h

@@ -50,6 +50,12 @@ struct picture_sys_t
 
 #include "../codec/avcodec/va_surface.h"
 
+static inline picture_sys_t *ActivePictureSys(picture_t *p_pic)
+{
+    struct va_pic_context *pic_ctx = (struct va_pic_context*)p_pic->context;
+    return pic_ctx ? &pic_ctx->picsys : p_pic->p_sys;
+}
+
 /* index to use for texture/resource that use a known DXGI format
  * (ie not DXGI_FORMAT_UNKNWON) */
 #define KNOWN_DXGI_INDEX   0

modules/video_output/win32/direct3d11.c

@@ -1112,8 +1112,7 @@ static void Prepare(vout_display_t *vd, picture_t *picture, subpicture_t *subpic
     if( sys->context_lock != INVALID_HANDLE_VALUE )
         WaitForSingleObjectEx( sys->context_lock, INFINITE, FALSE );
 #endif
-    struct va_pic_context *pic_ctx = (struct va_pic_context*)picture->context;
-    picture_sys_t *p_sys = pic_ctx ? &pic_ctx->picsys : picture->p_sys;
+    picture_sys_t *p_sys = ActivePictureSys(picture);
     if (!is_d3d11_opaque(picture->format.i_chroma) || sys->legacy_shader) {
         D3D11_TEXTURE2D_DESC texDesc;
         if (!is_d3d11_opaque(picture->format.i_chroma))
@@ -1208,8 +1207,7 @@ static void Display(vout_display_t *vd, picture_t *picture, subpicture_t *subpic
     if (!is_d3d11_opaque(picture->format.i_chroma) || sys->legacy_shader)
         DisplayD3DPicture(sys, &sys->picQuad, sys->stagingSys.resourceView);
     else {
-        struct va_pic_context *pic_ctx = (struct va_pic_context*)picture->context;
-        picture_sys_t *p_sys = pic_ctx ? &pic_ctx->picsys : picture->p_sys;
+        picture_sys_t *p_sys = ActivePictureSys(picture);
         DisplayD3DPicture(sys, &sys->picQuad, p_sys->resourceView);
     }