Re: [FFmpeg-devel] [PATCH v2 4/4] lavc/hevcdec: respect the value of no_output_of_prior_pics_flag

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

On Tue, 2022-06-14 at 09:23 +0800, Fei Wang wrote:
> From: Xu Guangxin <guangxin.xu@intel.com>
> 
> Even resolution or number of picture stores changes, we still need
> follow no_output_of_prior_pics_flag in next IDR.
> 
> Tested-by: Fei Wang <fei.w.wang@intel.com>
> Signed-off-by: Xu Guangxin <guangxin.xu@intel.com>
> ---
>  libavcodec/hevcdec.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
> index 99785aa5d1..b0317339a2 100644
> --- a/libavcodec/hevcdec.c
> +++ b/libavcodec/hevcdec.c
> @@ -594,15 +594,8 @@ static int hls_slice_header(HEVCContext *s)
>  
>      if (s->ps.sps != (HEVCSPS*)s->ps.sps_list[s->ps.pps->sps_id]->data) {
>          const HEVCSPS *sps = (HEVCSPS*)s->ps.sps_list[s->ps.pps->sps_id]-
> >data;
> -        const HEVCSPS *last_sps = s->ps.sps;
>          enum AVPixelFormat pix_fmt;
>  
> -        if (last_sps && IS_IRAP(s) && s->nal_unit_type != HEVC_NAL_CRA_NUT) {
> -            if (sps->width != last_sps->width || sps->height != last_sps-
> >height ||
> -                sps->temporal_layer[sps->max_sub_layers -
> 1].max_dec_pic_buffering !=
> -                last_sps->temporal_layer[last_sps->max_sub_layers -
> 1].max_dec_pic_buffering)
> -                sh->no_output_of_prior_pics_flag = 0;
> -        }
>          ff_hevc_clear_refs(s);
>  
>          ret = set_sps(s, sps, sps->pix_fmt);

From the context, sh->no_output_of_prior_pics_flag is NoOutputOfPriorPicsFlag in
the spec. According to C.5.2.2, the decoder may set NoOutputOfPriorPicsFlag to
no_output_of_prior_pics_flag or 1, but it is not allowed to set 0 in this case.

This patch LGTM.

Thanks
Haihao


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