[vlc-devel] [PATCH] contrib:ffmpeg: fix crash in DVXA in interlaced VC-1

[Steve Lhomme]

---
 contrib/src/ffmpeg/dxva_vc1_crash.patch | 16 ++++++++++++++++
 contrib/src/ffmpeg/rules.mak            |  1 +
 2 files changed, 17 insertions(+)
 create mode 100644 contrib/src/ffmpeg/dxva_vc1_crash.patch

diff --git a/contrib/src/ffmpeg/dxva_vc1_crash.patch b/contrib/src/ffmpeg/dxva_vc1_crash.patch
new file mode 100644
index 0000000000..2fecce0881
--- /dev/null
+++ b/contrib/src/ffmpeg/dxva_vc1_crash.patch
@@ -0,0 +1,16 @@
+--- ffmpeg/libavcodec/dxva2_vc1.c	2017-12-19 14:46:36.070857200 +0100
++++ ffmpeg/libavcodec/dxva2_vc1.c.refcrash	2017-12-19 14:36:57.157973200 +0100
+@@ -58,11 +58,11 @@ static void fill_picture_parameters(AVCo
+     memset(pp, 0, sizeof(*pp));
+     pp->wDecodedPictureIndex    =
+     pp->wDeblockedPictureIndex  = ff_dxva2_get_surface_index(avctx, ctx, current_picture->f);
+-    if (s->pict_type != AV_PICTURE_TYPE_I && !v->bi_type)
++    if (s->pict_type != AV_PICTURE_TYPE_I && !v->bi_type && s->last_picture.f->data[0])
+         pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(avctx, ctx, s->last_picture.f);
+     else
+         pp->wForwardRefPictureIndex = 0xffff;
+-    if (s->pict_type == AV_PICTURE_TYPE_B && !v->bi_type)
++    if (s->pict_type == AV_PICTURE_TYPE_B && !v->bi_type && s->next_picture.f->data[0])
+         pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(avctx, ctx, s->next_picture.f);
+     else
+         pp->wBackwardRefPictureIndex = 0xffff;
diff --git a/contrib/src/ffmpeg/rules.mak b/contrib/src/ffmpeg/rules.mak
index e99d9dfb7c..d88cefd5b4 100644
--- a/contrib/src/ffmpeg/rules.mak
+++ b/contrib/src/ffmpeg/rules.mak
@@ -231,6 +231,7 @@ ffmpeg: ffmpeg-$(FFMPEG_BASENAME).tar.xz .sum-ffmpeg
 	tar xvJf "$<" --strip-components=1 -C $@-$(FFMPEG_BASENAME)
 ifdef USE_FFMPEG
 	$(APPLY) $(SRC)/ffmpeg/armv7_fixup.patch
+	$(APPLY) $(SRC)/ffmpeg/dxva_vc1_crash.patch
 endif
 ifdef USE_LIBAV
 	$(APPLY) $(SRC)/ffmpeg/libav_gsm.patch
-- 
2.14.2