Fix H264 YUV400 surface render issue on IVB

All decoded frame are considered as NV12 format in driver,
for YUV400 stream format decoding senerios, we need set the
chroma component of NV12 to a constant value(0x80), otherwise
the converted ARGB from NV12 format is not correct and cause
blue screen when rending.

Signed-off-by: Li Xiaowei <xiaowei.a.li@intel.com>

diff --git a/src/gen7_mfd.c b/src/gen7_mfd.c
index ae36fce..0d583b5 100755 (executable)
--- a/src/gen7_mfd.c
+++ b/src/gen7_mfd.c
@@ -911,6 +911,17 @@ gen7_mfd_avc_decode_init(VADriverContextP ctx,
     obj_surface->flags &= ~SURFACE_REF_DIS_MASK;
     obj_surface->flags |= (pic_param->pic_fields.bits.reference_pic_flag ? SURFACE_REFERENCED : 0);
     i965_check_alloc_surface_bo(ctx, obj_surface, 1, VA_FOURCC('N','V','1','2'), SUBSAMPLE_YUV420);
+
+    /* initial uv component for YUV400 case */
+    if (pic_param->seq_fields.bits.chroma_format_idc == 0) {
+         unsigned int uv_offset = obj_surface->width * obj_surface->height;
+         unsigned int uv_size   = obj_surface->width * obj_surface->height / 2;
+
+         drm_intel_gem_bo_map_gtt(obj_surface->bo);
+         memset(obj_surface->bo->virtual + uv_offset, 0x80, uv_size);
+         drm_intel_gem_bo_unmap_gtt(obj_surface->bo);
+    }
+
     gen7_mfd_init_avc_surface(ctx, pic_param, obj_surface);
 
     dri_bo_unreference(gen7_mfd_context->post_deblocking_output.bo);