[FFmpeg-devel] [PATCH v2 2/2] lavf/qsv: clone the frame which may be managed by framework

[Ruiling Song]

For filters based on framesync, the input frame was managed
by framesync, so we should not directly keep and destroy it,
instead we make a clone of it here, or else double-free will occur.
But for other filters not based on framesync, we still need to
free the input frame inside filter_frame. That's why I made
this v2 to fix the side-effect on normal filters.

v2:
and one av_frame_free() in vf_vpp_qsv.c

Signed-off-by: Ruiling Song <ruiling.song at intel.com>
---
 libavfilter/qsvvpp.c     | 4 ++--
 libavfilter/vf_vpp_qsv.c | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/libavfilter/qsvvpp.c b/libavfilter/qsvvpp.c
index f32b46d..86787c5 100644
--- a/libavfilter/qsvvpp.c
+++ b/libavfilter/qsvvpp.c
@@ -296,7 +296,7 @@ static QSVFrame *submit_frame(QSVVPPContext *s, AVFilterLink *inlink, AVFrame *p
             av_log(ctx, AV_LOG_ERROR, "QSVVPP gets a wrong frame.\n");
             return NULL;
         }
-        qsv_frame->frame   = picref;
+        qsv_frame->frame   = av_frame_clone(picref);
         qsv_frame->surface = (mfxFrameSurface1 *)qsv_frame->frame->data[3];
     } else {
         /* make a copy if the input is not padded as libmfx requires */
@@ -318,7 +318,7 @@ static QSVFrame *submit_frame(QSVVPPContext *s, AVFilterLink *inlink, AVFrame *p
             av_frame_copy_props(qsv_frame->frame, picref);
             av_frame_free(&picref);
         } else
-            qsv_frame->frame = picref;
+            qsv_frame->frame = av_frame_clone(picref);
 
         if (map_frame_to_surface(qsv_frame->frame,
                                 &qsv_frame->surface_internal) < 0) {
diff --git a/libavfilter/vf_vpp_qsv.c b/libavfilter/vf_vpp_qsv.c
index bd5fc32..4ef5bfb 100644
--- a/libavfilter/vf_vpp_qsv.c
+++ b/libavfilter/vf_vpp_qsv.c
@@ -326,8 +326,11 @@ static int config_output(AVFilterLink *outlink)
 static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
 {
     VPPContext *vpp = inlink->dst->priv;
+    int ret = 0;
 
-    return ff_qsvvpp_filter_frame(vpp->qsv, inlink, picref);
+    ret = ff_qsvvpp_filter_frame(vpp->qsv, inlink, picref);
+    av_frame_free(&picref);
+    return ret;
 }
 
 static int query_formats(AVFilterContext *ctx)
-- 
2.7.4