[FFmpeg-devel] [PATCH 3/4] scale_qsv frame crop support

[Koushik Dutta]

The crop filter has no effect on scale_qsv:

-vf crop=100:100,scale_qsv=300x300

Hardware frames (AV_PIX_FMT_FLAG_HWACCEL) are expected to use the crop_* properties,
as seen in the implementation vf_crop.c.

This patch is slightly different from the previously submitted patches
since qsv supports frame crop via the vpp_qsv filter. If no explicit crop
is detected via that filter, AVFrame.crop_* will be used instead.
Removal of vpp_qsv's crop argument may be warranted.
---
 libavfilter/qsvvpp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavfilter/qsvvpp.c b/libavfilter/qsvvpp.c
index 0818ada117..05ce387bc3 100644
--- a/libavfilter/qsvvpp.c
+++ b/libavfilter/qsvvpp.c
@@ -467,6 +467,16 @@ static QSVFrame *submit_frame(QSVVPPContext *s, AVFilterLink *inlink, AVFrame *p
     else if (qsv_frame->frame->repeat_pict == 4)
         qsv_frame->surface.Info.PicStruct |= MFX_PICSTRUCT_FRAME_TRIPLING;
 
+    // if crop arguments are not present from the vpp_qsv filter, use the provided AVFrame
+    // crop_* members instead.
+    if (!qsv_frame->surface.Info.CropX && !qsv_frame->surface.Info.CropY
+        && qsv_frame->surface.Info.CropW == picref->width && qsv_frame->surface.Info.CropH == picref->height) {
+        qsv_frame->surface.Info.CropW = (mfxU16)((picref->width - picref->crop_right) - picref->crop_left);
+        qsv_frame->surface.Info.CropH = (mfxU16)((picref->height - picref->crop_bottom) - picref->crop_top);
+        qsv_frame->surface.Info.CropX = (mfxU16)picref->crop_left;
+        qsv_frame->surface.Info.CropY = (mfxU16)picref->crop_top;
+    }
+
     return qsv_frame;
 }
 
-- 
2.39.5 (Apple Git-154)