Re: [FFmpeg-devel] [PATCH 2/6] libavcodec/qsvenc: Add gop_size reset support to qsvenc

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

On Thu, 2022-08-18 at 14:59 +0800, Wenbin Chen wrote:
> Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> ---
>  doc/encoders.texi   |  3 +++
>  libavcodec/qsvenc.c | 18 +++++++++++++++++-
>  libavcodec/qsvenc.h |  2 ++
>  3 files changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 69fa46f3ea..9fb63856b1 100644
> --- a/doc/encoders.texi
> +++ b/doc/encoders.texi
> @@ -3348,6 +3348,9 @@ Change these value to reset qsv codec's qp
> configuration.
>  @item @var{max_frame_size}
>  Supported in h264_qsv and hevc_qsv.
>  Change this value to reset qsv codec's MaxFrameSize configuration.
> +
> +@item @var{gop_size}
> +Change this value to reset qsv codec's gop configuration.
>  @end table
>  
>  @subsection H264 options
> diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
> index c911b81e7d..b3820e4fe0 100644
> --- a/libavcodec/qsvenc.c
> +++ b/libavcodec/qsvenc.c
> @@ -635,6 +635,7 @@ static int init_video_param(AVCodecContext *avctx,
> QSVEncContext *q)
>      q->param.mfx.CodecProfile       = q->profile;
>      q->param.mfx.TargetUsage        = avctx->compression_level;
>      q->param.mfx.GopPicSize         = FFMAX(0, avctx->gop_size);
> +    q->old_gop_size                 = avctx->gop_size;
>      q->param.mfx.GopRefDist         = FFMAX(-1, avctx->max_b_frames) + 1;
>      q->param.mfx.GopOptFlag         = avctx->flags & AV_CODEC_FLAG_CLOSED_GOP
> ?
>                                        MFX_GOP_CLOSED : MFX_GOP_STRICT;
> @@ -1692,16 +1693,31 @@ static int update_max_frame_size(AVCodecContext
> *avctx, QSVEncContext *q)
>      return updated;
>  }
>  
> +static int update_gop_size(AVCodecContext *avctx, QSVEncContext *q)
> +{
> +    int updated = 0;
> +    UPDATE_PARAM(q->old_gop_size, avctx->gop_size);
> +    if (!updated)
> +        return 0;
> +
> +    q->param.mfx.GopPicSize = FFMAX(0, avctx->gop_size);
> +    av_log(avctx, AV_LOG_DEBUG, "reset GopPicSize to %d\n",
> +           q->param.mfx.GopPicSize);
> +
> +    return updated;
> +}
> +
>  static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
>                               const AVFrame *frame)
>  {
>      int needReset = 0, ret = 0;
>  
> -    if (!frame)
> +    if (!frame || avctx->codec_id == AV_CODEC_ID_MJPEG)
>          return 0;

Better to fix mjpeg_qsv in a separate patch if mjpeg_qsv is not able to resetany parameter. 

Thanks
Haihao

>  
>      needReset = update_qp(avctx, q);
>      needReset |= update_max_frame_size(avctx, q);
> +    needReset |= update_gop_size(avctx, q);
>      if (!needReset)
>          return 0;
>  
> diff --git a/libavcodec/qsvenc.h b/libavcodec/qsvenc.h
> index c452c5b806..fdedae28dd 100644
> --- a/libavcodec/qsvenc.h
> +++ b/libavcodec/qsvenc.h
> @@ -237,6 +237,8 @@ typedef struct QSVEncContext {
>      float old_b_quant_offset;
>      // This is used for max_frame_size reset
>      int old_max_frame_size;
> +    // This is used for gop reset
> +    int old_gop_size;
>  } QSVEncContext;
>  
>  int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q);
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