[FFmpeg-devel] [PATCH v1] lavu/hwcontext_vaapi: sync surface before export its DRM handle

["zhilizhao(赵志立)"]

> On Feb 24, 2023, at 13:45, Fei Wang <fei.w.wang-at-intel.com at 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.wang at 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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