[FFmpeg-devel] [PATCH 1/2] libavcodec/qsvenc_av1: Add low_delay_brc support to av1_qsv encoder

[wenbin.chen-at-intel.com@ffmpeg.org]

From: Wenbin Chen <wenbin.chen@intel.com>

Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
---
 doc/encoders.texi       | 5 +++++
 libavcodec/qsvenc.c     | 4 ++++
 libavcodec/qsvenc_av1.c | 1 +
 3 files changed, 10 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index b8051cda3f..543b5e26a9 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3850,6 +3850,11 @@ Extended bitrate control.
 
 @item @var{look_ahead_depth}
 Depth of look ahead in number frames, available when extbrc option is enabled.
+
+@item @var{low_delay_brc}
+Setting this flag turns on or off LowDelayBRC feautre in qsv plugin, which provides
+more accurate bitrate control to minimize the variance of bitstream size frame
+by frame. Value: -1-default 0-off 1-on
 @end table
 
 @section snow
diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 514a1e8148..f5c6a164bb 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -537,6 +537,7 @@ static void dump_video_av1_param(AVCodecContext *avctx, QSVEncContext *q,
 
     av_log(avctx, AV_LOG_VERBOSE, "WriteIVFHeaders: %s \n",
            print_threestate(av1_bs_param->WriteIVFHeaders));
+    av_log(avctx, AV_LOG_VERBOSE, "LowDelayBRC: %s\n", print_threestate(co3->LowDelayBRC));
 }
 #endif
 
@@ -1090,6 +1091,9 @@ static int init_video_param(AVCodecContext *avctx, QSVEncContext *q)
                 q->extco3.MaxFrameSizeP = q->max_frame_size_p;
 
             q->extco3.ScenarioInfo = q->scenario;
+        } else if (avctx->codec_id == AV_CODEC_ID_AV1) {
+            if (q->low_delay_brc >= 0)
+                q->extco3.LowDelayBRC = q->low_delay_brc ? MFX_CODINGOPTION_ON : MFX_CODINGOPTION_OFF;
         }
 
         if (avctx->codec_id == AV_CODEC_ID_HEVC) {
diff --git a/libavcodec/qsvenc_av1.c b/libavcodec/qsvenc_av1.c
index bb9ad16927..1e7801fefe 100644
--- a/libavcodec/qsvenc_av1.c
+++ b/libavcodec/qsvenc_av1.c
@@ -110,6 +110,7 @@ static const AVOption options[] = {
     QSV_OPTION_ADAPTIVE_I
     QSV_OPTION_ADAPTIVE_B
     QSV_OPTION_EXTBRC
+    QSV_OPTION_LOW_DELAY_BRC
     { "profile", NULL, OFFSET(qsv.profile), AV_OPT_TYPE_INT, { .i64 = MFX_PROFILE_UNKNOWN }, 0, INT_MAX, VE, "profile" },
         { "unknown" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_UNKNOWN      }, INT_MIN, INT_MAX,     VE, "profile" },
         { "main"    , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_AV1_MAIN     }, INT_MIN, INT_MAX,     VE, "profile" },
-- 
2.34.1

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