[FFmpeg-devel] [PATCH] avcodec/vvc: Add support for output_corrupt/showall flags

[Nuo Mi]

On Mon, Jan 13, 2025 at 4:46 PM Zhao Zhili <
quinkblack-at-foxmail.com at ffmpeg.org> wrote:

> From: Zhao Zhili <zhilizhao at tencent.com>
>
> Hi Zhili,
Thank you for the patch.

This will fail on GDR clips, such as:
    GDR_B_NOKIA_2.bit
    GDR_C_NOKIA_2.bit

By design, a GDR frame refers to missing frames and gradually refreshes the
entire frame.
See
https://www.nokia.com/blog/fast-forwarding-video-takes-more-than-a-swipe/

---
>  libavcodec/vvc/refs.c | 16 +++++++++++++++-
>  libavcodec/vvc/refs.h |  1 +
>  2 files changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/vvc/refs.c b/libavcodec/vvc/refs.c
> index bc3b3d0d13..a204e7d800 100644
> --- a/libavcodec/vvc/refs.c
> +++ b/libavcodec/vvc/refs.c
> @@ -47,6 +47,8 @@ void ff_vvc_unref_frame(VVCFrameContext *fc, VVCFrame
> *frame, int flags)
>          return;
>
>      frame->flags &= ~flags;
> +    if (!(frame->flags & ~VVC_FRAME_FLAG_CORRUPT))
> +        frame->flags = 0;
>      if (!frame->flags) {
>          av_frame_unref(frame->frame);
>          av_refstruct_unref(&frame->sps);
> @@ -248,6 +250,9 @@ int ff_vvc_output_frame(VVCContext *s, VVCFrameContext
> *fc, AVFrame *out, const
>          if (nb_output) {
>              VVCFrame *frame = &fc->DPB[min_idx];
>
> +            if (frame->flags & VVC_FRAME_FLAG_CORRUPT)
> +                frame->frame->flags |= AV_FRAME_FLAG_CORRUPT;
> +
>              ret = av_frame_ref(out, frame->frame);
>              if (frame->flags & VVC_FRAME_FLAG_BUMPING)
>                  ff_vvc_unref_frame(fc, frame, VVC_FRAME_FLAG_OUTPUT |
> VVC_FRAME_FLAG_BUMPING);
> @@ -357,7 +362,7 @@ static VVCFrame *generate_missing_ref(VVCContext *s,
> VVCFrameContext *fc, int po
>
>      frame->poc      = poc;
>      frame->sequence = s->seq_decode;
> -    frame->flags    = 0;
> +    frame->flags    = VVC_FRAME_FLAG_CORRUPT;
>
>      ff_vvc_report_frame_finished(frame);
>
> @@ -392,6 +397,15 @@ static int add_candidate_ref(VVCContext *s,
> VVCFrameContext *fc, RefPicList *lis
>      if (ref == fc->ref || list->nb_refs >= VVC_MAX_REF_ENTRIES)
>          return AVERROR_INVALIDDATA;
>
> +    if (!IS_CVSS(s) && (!ref || ref->flags & VVC_FRAME_FLAG_CORRUPT)) {
> +        if (!(s->avctx->flags & AV_CODEC_FLAG_OUTPUT_CORRUPT) &&
> +            !(s->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL)) {
> +            return AVERROR_INVALIDDATA;
> +        }
> +
> +        fc->ref->flags |= VVC_FRAME_FLAG_CORRUPT;
> +    }
> +
>      if (!ref) {
>          ref = generate_missing_ref(s, fc, poc);
>          if (!ref)
> diff --git a/libavcodec/vvc/refs.h b/libavcodec/vvc/refs.h
> index e2271ab381..a3081a76be 100644
> --- a/libavcodec/vvc/refs.h
> +++ b/libavcodec/vvc/refs.h
> @@ -29,6 +29,7 @@
>  #define VVC_FRAME_FLAG_SHORT_REF (1 << 1)
>  #define VVC_FRAME_FLAG_LONG_REF  (1 << 2)
>  #define VVC_FRAME_FLAG_BUMPING   (1 << 3)
> +#define VVC_FRAME_FLAG_CORRUPT   (1 << 4)
>
>  int ff_vvc_output_frame(VVCContext *s, VVCFrameContext *fc, struct
> AVFrame *out, int no_output_of_prior_pics_flag, int flush);
>  void ff_vvc_bump_frame(VVCContext *s, VVCFrameContext *fc);
> --
> 2.46.0
>
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