> On Feb 24, 2023, at 13:45, Fei Wang <fei.w.wang-at-intel....@ffmpeg.org>
> wrote:
>
> According to description of vaExportSurfaceHandle in libva, vaSyncSurface
> must be called if the contents of the surface will be read.
>
> Fixes ticket #9967.
>
> Signed-off-by: Fei Wang <fei.w.w...@intel.com>
> ---
> libavutil/hwcontext_vaapi.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
> index 938bd5447d..90c2c191d9 100644
> --- a/libavutil/hwcontext_vaapi.c
> +++ b/libavutil/hwcontext_vaapi.c
> @@ -1319,8 +1319,17 @@ static int vaapi_map_to_drm_esh(AVHWFramesContext
> *hwfc, AVFrame *dst,
> surface_id = (VASurfaceID)(uintptr_t)src->data[3];
>
> export_flags = VA_EXPORT_SURFACE_SEPARATE_LAYERS;
> - if (flags & AV_HWFRAME_MAP_READ)
> + if (flags & AV_HWFRAME_MAP_READ) {
> export_flags |= VA_EXPORT_SURFACE_READ_ONLY;
> +
> + vas = vaSyncSurface(hwctx->display, surface_id);
> + if (vas != VA_STATUS_SUCCESS) {
> + av_log(hwfc, AV_LOG_ERROR, "Failed to sync surface "
> + "%#x: %d (%s).\n", surface_id, vas, vaErrorStr(vas));
> + return AVERROR(EIO);
> + }
> + }
> +
> if (flags & AV_HWFRAME_MAP_WRITE)
> export_flags |= VA_EXPORT_SURFACE_WRITE_ONLY;
LGTM.
>
> --
> 2.25.1
>
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