[FFmpeg-devel] [PATCH] lavc/qsvenc: set base address for V plane

[Haihao Xiang]

The SDK checks Data.V when using system memory for VP9 encoding. This
fixed the error below:

$ ffmpeg -qsv_device /dev/dri/renderD129 -f lavfi -i yuvtestsrc -c:v
vp9_qsv -f null -

[vp9_qsv @ 0x55b8387cbe90] Error during encoding: NULL pointer (-2)
Video encoding failed
---
 libavcodec/qsvenc.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 26a94cd419..7431ccfca5 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -1389,8 +1389,23 @@ static int submit_frame(QSVEncContext *q, const AVFrame 
*frame,
         qf->surface.Data.PitchLow  = qf->frame->linesize[0];
         qf->surface.Data.Y         = qf->frame->data[0];
         qf->surface.Data.UV        = qf->frame->data[1];
-    }
 
+        /* The SDK checks Data.V when using system memory for VP9 encoding */
+        switch (frame->format) {
+        case AV_PIX_FMT_NV12:
+            qf->surface.Data.V     = qf->surface.Data.UV + 1;
+            break;
+
+        case AV_PIX_FMT_P010:
+            qf->surface.Data.V     = qf->surface.Data.UV + 2;
+            break;
+
+        default:
+            /* should not reach here */
+            av_assert0(0);
+            break;
+        }
+    }
     qf->surface.Data.TimeStamp = av_rescale_q(frame->pts, q->avctx->time_base, 
(AVRational){1, 90000});
 
     *new_frame = qf;
-- 
2.17.1

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