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Subject: Re: [FFmpeg-devel] [PATCH v1 10/19] avcodec/vvcdec: verify picture
hash
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toqsxw@gmail.com:
> From: Wu Jianhua <toqsxw@outlook.com>
>
> Signed-off-by: Wu Jianhua <toqsxw@outlook.com>
> ---
> libavcodec/vvc/dec.c | 16 +++++++++++++++-
> libavcodec/vvc/sei.c | 10 ++++++++++
> libavcodec/vvc/sei.h | 3 +++
> 3 files changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/libavcodec/vvc/dec.c b/libavcodec/vvc/dec.c
> index 4c0d08440a..6c36eb553e 100644
> --- a/libavcodec/vvc/dec.c
> +++ b/libavcodec/vvc/dec.c
> @@ -1079,7 +1079,21 @@ static int frame_end(VVCContext *s, VVCFrameContext *fc)
> }
> }
>
> - return ret;
> + if (!s->avctx->hwaccel && s->avctx->err_recognition & AV_EF_CRCCHECK) {
> + VVCSEI *sei = &fc->sei;
> + if (sei->picture_hash.present) {
> + ret = ff_vvc_sei_verify_hash(sei, fc->ref->frame, fc->ps.pps->width, fc->ps.pps->height);
> + if (ret < 0) {
> + av_log(s->avctx, AV_LOG_ERROR,
> + "Verifying checksum for frame with decoder_order %d: failed\n",
> + (int)fc->decode_order);
> + if (s->avctx->err_recognition & AV_EF_EXPLODE)
> + return ret;
> + }
> + }
> + }
> +
> + return 0;
> }
>
> static int wait_delayed_frame(VVCContext *s, AVFrame *output, int *got_output)
> diff --git a/libavcodec/vvc/sei.c b/libavcodec/vvc/sei.c
> index 2d81ae5908..c955d9921f 100644
> --- a/libavcodec/vvc/sei.c
> +++ b/libavcodec/vvc/sei.c
> @@ -136,5 +136,15 @@ int ff_vvc_sei_replace(VVCSEI *dst, const VVCSEI *src)
> void ff_vvc_sei_reset(VVCSEI *s)
> {
> ff_h2645_sei_reset(&s->common);
> + ff_h274_hash_freep(&s->hash_ctx);
> s->picture_hash.present = 0;
> }
> +
> +int ff_vvc_sei_verify_hash(VVCSEI *s, const AVFrame *frame, const int coded_width, const int coded_height)
> +{
> + const int ret = ff_h274_hash_init(&s->hash_ctx, s->picture_hash.hash_type);
> + if (ret < 0)
> + return ret;
> +
> + return ff_h274_hash_verify(s->hash_ctx, &s->picture_hash, frame, coded_width, coded_height);
> +}
> diff --git a/libavcodec/vvc/sei.h b/libavcodec/vvc/sei.h
> index 6e4855bf60..a8aedc2837 100644
> --- a/libavcodec/vvc/sei.h
> +++ b/libavcodec/vvc/sei.h
> @@ -36,6 +36,8 @@
> typedef struct VVCSEI {
> H2645SEI common;
> H274SEIPictureHash picture_hash;
> +
> + H274HashContext *hash_ctx;
The HashContext is what is used to verify the hashes, it is not part of
the SEI and should therefore not be in VVCSEI (but in the decoder context).
> } VVCSEI;
>
> struct VVCFrameContext;
> @@ -43,5 +45,6 @@ struct VVCFrameContext;
> int ff_vvc_sei_decode(VVCSEI *s, const H266RawSEI *sei, const struct VVCFrameContext *fc);
> int ff_vvc_sei_replace(VVCSEI *dst, const VVCSEI *src);
> void ff_vvc_sei_reset(VVCSEI *s);
> +int ff_vvc_sei_verify_hash(VVCSEI *s, const AVFrame *frame, int coded_width, int coded_height);
>
> #endif /* AVCODEC_VVC_SEI_H */
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