Re: [FFmpeg-devel] [PATCH 2/3] libavcodec/qsvenc: Add b_strategy option to hevc_qsv

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

On Mon, 2022-01-24 at 10:59 +0800, Wenbin Chen wrote:
> Add b_strategy option to hevc_qsv. By enabling this option, encoder can
> use b frames as reference.
> 
> Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> ---
>  doc/encoders.texi   | 3 +++
>  libavcodec/qsvenc.c | 6 ++++--
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 8966610263..6c1c4df57a 100644
> --- a/doc/encoders.texi
> +++ b/doc/encoders.texi
> @@ -3403,6 +3403,9 @@ Maximum encoded slice size in bytes.
>  @item @var{p_strategy}
>  Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0).
>  
> +@item @var{b_strategy}
> +This option controls usage of B frames as reference.
> +
>  @item @var{dblk_idc}
>  This option disable deblocking. It has value in range 0~2.
>  
> diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
> index f311cd9ce4..a8d876d6d9 100644
> --- a/libavcodec/qsvenc.c
> +++ b/libavcodec/qsvenc.c
> @@ -888,8 +888,6 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
>              q->extco2.LookAheadDS = q->look_ahead_downsampling;
>              q->extco2.RepeatPPS   = q->repeat_pps ? MFX_CODINGOPTION_ON :
> MFX_CODINGOPTION_OFF;
>  
> -            if (q->b_strategy >= 0)
> -                q->extco2.BRefType = q->b_strategy ? MFX_B_REF_PYRAMID :
> MFX_B_REF_OFF;
>              if (q->adaptive_i >= 0)
>                  q->extco2.AdaptiveI = q->adaptive_i ? MFX_CODINGOPTION_ON :
> MFX_CODINGOPTION_OFF;
>              if (q->adaptive_b >= 0)
> @@ -910,6 +908,10 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
>              q->extco2.DisableDeblockingIdc = q->dblk_idc;
>  #endif
>  
> +#if QSV_VERSION_ATLEAST(1, 8)
> +            if (q->b_strategy >= 0)
> +                q->extco2.BRefType = q->b_strategy ? MFX_B_REF_PYRAMID :
> MFX_B_REF_OFF;
> +#endif
>  #if QSV_VERSION_ATLEAST(1, 9)
>              if (avctx->qmin >= 0 && avctx->qmax >= 0 && avctx->qmin > avctx-
> >qmax) {
>                  av_log(avctx, AV_LOG_ERROR, "qmin and or qmax are set but
> invalid, please make sure min <= max\n");

LGTM, thx

-Haihao

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