Re: [FFmpeg-devel] [PATCH v2 3/3] libavcodec/qsvdec: using suggested num to set init_pool_size

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

On Fri, 2022-03-18 at 07:40 +0000, Soft Works wrote:
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> > Wenbin Chen
> > Sent: Friday, March 18, 2022 7:25 AM
> > To: ffmpeg-devel@ffmpeg.org
> > Subject: [FFmpeg-devel] [PATCH v2 3/3] libavcodec/qsvdec: using
> > suggested num to set init_pool_size
> > 
> > The init_pool_size is set to be 64 and it is too many.
> > Use IOSurfQuery to get NumFrameSuggest which is the suggested
> > number of frame that needed to be allocated when initializing the
> > decoder.
> > Considering that the hevc_qsv encoder uses the  most frame buffer,
> > async is 4 (default) and max_b_frames is 8 (default) and decoder
> > may followed by VPP, use NumFrameSuggest + 16 to set init_pool_size.
> > 
> > Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> > Signed-off-by: Guangxin Xu <guangxin.xu@intel.com>
> > ---
> >  libavcodec/qsvdec.c | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> > 
> > diff --git a/libavcodec/qsvdec.c b/libavcodec/qsvdec.c
> > index 210bd0c1d5..9875d3d632 100644
> > --- a/libavcodec/qsvdec.c
> > +++ b/libavcodec/qsvdec.c
> > @@ -88,7 +88,7 @@ typedef struct QSVContext {
> >      uint32_t fourcc;
> >      mfxFrameInfo frame_info;
> >      AVBufferPool *pool;
> > -
> > +    int suggest_pool_size;
> >      int initialized;
> > 
> >      // options set by the caller
> > @@ -275,7 +275,7 @@ static int qsv_decode_preinit(AVCodecContext
> > *avctx, QSVContext *q, enum AVPixel
> >          hwframes_ctx->height            = FFALIGN(avctx-
> > > coded_height, 32);
> > 
> >          hwframes_ctx->format            = AV_PIX_FMT_QSV;
> >          hwframes_ctx->sw_format         = avctx->sw_pix_fmt;
> > -        hwframes_ctx->initial_pool_size = 64 + avctx-
> > > extra_hw_frames;
> > 
> > +        hwframes_ctx->initial_pool_size = q->suggest_pool_size + 16 +
> > avctx->extra_hw_frames;
> >          frames_hwctx->frame_type        =
> > MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET;
> > 
> >          ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
> > @@ -793,6 +793,9 @@ static int qsv_process_data(AVCodecContext *avctx,
> > QSVContext *q,
> >      }
> > 
> >      if (q->reinit_flag || !q->session || !q->initialized) {
> > +        mfxFrameAllocRequest request;
> > +        memset(&request, 0, sizeof(request));
> > +
> >          q->reinit_flag = 0;
> >          ret = qsv_decode_header(avctx, q, pkt, pix_fmt, &param);
> >          if (ret < 0) {
> > @@ -802,12 +805,19 @@ static int qsv_process_data(AVCodecContext
> > *avctx, QSVContext *q,
> >                  av_log(avctx, AV_LOG_ERROR, "Error decoding
> > header\n");
> >              goto reinit_fail;
> >          }
> > +        param.IOPattern = q->iopattern;
> > 
> >          q->orig_pix_fmt = avctx->pix_fmt = pix_fmt =
> > ff_qsv_map_fourcc(param.mfx.FrameInfo.FourCC);
> > 
> >          avctx->coded_width  = param.mfx.FrameInfo.Width;
> >          avctx->coded_height = param.mfx.FrameInfo.Height;
> > 
> > +        ret = MFXVideoDECODE_QueryIOSurf(q->session, &param,
> > &request);
> > +        if (ret < 0)
> > +            return ff_qsv_print_error(avctx, ret, "Error querying IO
> > surface");
> > +
> > +        q->suggest_pool_size = request.NumFrameSuggested;
> > +
> >          ret = qsv_decode_preinit(avctx, q, pix_fmt, &param);
> >          if (ret < 0)
> >              goto reinit_fail;
> > --
> 
> Thanks for the patch! I have that on my list for quite a while.
> Will look at it shortly.

Hi Softworz,

This patchset LGTM and works well, do you have any comment ? 

Thanks
Haihao

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