[FFmpeg-cvslog] libavcodec/qsvdec: using suggested num to set init_pool_size

[Wenbin Chen]

ffmpeg | branch: master | Wenbin Chen <wenbin.chen-at-intel.com at ffmpeg.org> | Fri Mar 18 14:25:11 2022 +0800| [0a0847dbac9bdfd24607572886a0d42cdea1691a] | committer: Haihao Xiang

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 at intel.com>
Signed-off-by: Guangxin Xu <guangxin.xu at intel.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0a0847dbac9bdfd24607572886a0d42cdea1691a
---

 libavcodec/qsvdec.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/libavcodec/qsvdec.c b/libavcodec/qsvdec.c
index e49fcb2a4a..dcdbb68fac 100644
--- a/libavcodec/qsvdec.c
+++ b/libavcodec/qsvdec.c
@@ -89,7 +89,7 @@ typedef struct QSVContext {
     uint32_t fourcc;
     mfxFrameInfo frame_info;
     AVBufferPool *pool;
-
+    int suggest_pool_size;
     int initialized;
 
     // options set by the caller
@@ -276,7 +276,7 @@ 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);
@@ -794,6 +794,9 @@ 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) {
@@ -803,12 +806,19 @@ 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;