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 Mon, 2022-03-28 at 02:26 +0000, Xiang, Haihao wrote:
> 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 ? 

Ping, I'll apply this patchset in a few days if no more comment.

Regards
Haihao

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