[FFmpeg-devel] [PATCH v1 1/2] lavc/vvcdec: Add missed chroma sampling factor for crop offset

[Wang, Fei W]

On Sat, 2024-03-09 at 19:57 +0800, Nuo Mi wrote:
Thank you, Fei,

Do you happen to know why the following clips are still failing?

CROP_A_Panasonic_4.bit

Ffmepg decode doesn't apply crop strictly. It will adjust crop for alignment, see av_frame_apply_cropping().

Thanks
Fei

CROP_B_Panasonic_4.bit
https://github.com/ffvvc/tests/tree/main/conformance/failed/v1/CROP

On Fri, Mar 8, 2024 at 8:54 AM <fei.w.wang-at-intel.com at ffmpeg.org<mailto:fei.w.wang-at-intel.com at ffmpeg.org>> wrote:
From: Fei Wang <fei.w.wang at intel.com<mailto:fei.w.wang at intel.com>>

Signed-off-by: Fei Wang <fei.w.wang at intel.com<mailto:fei.w.wang at intel.com>>
---
 libavcodec/vvc/vvc_refs.c | 8 ++++----
 libavcodec/vvc/vvcdec.c   | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/libavcodec/vvc/vvc_refs.c b/libavcodec/vvc/vvc_refs.c
index 99f2dcf3ec..afcfc09da7 100644
--- a/libavcodec/vvc/vvc_refs.c
+++ b/libavcodec/vvc/vvc_refs.c
@@ -185,10 +185,10 @@ int ff_vvc_set_new_ref(VVCContext *s, VVCFrameContext *fc, AVFrame **frame)

     ref->poc      = poc;
     ref->sequence = s->seq_decode;
-    ref->frame->crop_left   = fc->ps.pps->r->pps_conf_win_left_offset;
-    ref->frame->crop_right  = fc->ps.pps->r->pps_conf_win_right_offset;
-    ref->frame->crop_top    = fc->ps.pps->r->pps_conf_win_top_offset;
-    ref->frame->crop_bottom = fc->ps.pps->r->pps_conf_win_bottom_offset;
+    ref->frame->crop_left   = fc->ps.pps->r->pps_conf_win_left_offset << fc->ps.sps->hshift[CHROMA];
+    ref->frame->crop_right  = fc->ps.pps->r->pps_conf_win_right_offset << fc->ps.sps->hshift[CHROMA];
+    ref->frame->crop_top    = fc->ps.pps->r->pps_conf_win_top_offset << fc->ps.sps->vshift[CHROMA];
+    ref->frame->crop_bottom = fc->ps.pps->r->pps_conf_win_bottom_offset << fc->ps.sps->vshift[CHROMA];

     return 0;
 }
diff --git a/libavcodec/vvc/vvcdec.c b/libavcodec/vvc/vvcdec.c
index 570e2aa513..a979ebd41c 100644
--- a/libavcodec/vvc/vvcdec.c
+++ b/libavcodec/vvc/vvcdec.c
@@ -727,8 +727,8 @@ static void export_frame_params(VVCContext *s, const VVCFrameContext *fc)
     c->pix_fmt      = sps->pix_fmt;
     c->coded_width  = pps->width;
     c->coded_height = pps->height;
-    c->width        = pps->width  - pps->r->pps_conf_win_left_offset - pps->r->pps_conf_win_right_offset;
-    c->height       = pps->height - pps->r->pps_conf_win_top_offset - pps->r->pps_conf_win_bottom_offset;
+    c->width        = pps->width  - ((pps->r->pps_conf_win_left_offset + pps->r->pps_conf_win_right_offset) << sps->hshift[CHROMA]);
+    c->height       = pps->height - ((pps->r->pps_conf_win_top_offset + pps->r->pps_conf_win_bottom_offset) << sps->vshift[CHROMA]);
 }

 static int frame_setup(VVCFrameContext *fc, VVCContext *s)