From 17df61083dc79e90fa0180811dc69fab077096aa Mon Sep 17 00:00:00 2001
From: Wenbin Chen <wenbin.chen-at-intel.com@ffmpeg.org>
Date: Fri, 23 Sep 2022 10:44:10 +0800
Subject: [PATCH] libavcodec/qsvenc: Add framerate reset support to qsv

Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
---
 doc/encoders.texi   |  3 +++
 libavcodec/qsvenc.c | 26 ++++++++++++++++++++++++++
 libavcodec/qsvenc.h |  2 ++
 3 files changed, 31 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 5a5579d5e5..cc5abccaa4 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -3362,6 +3362,9 @@ Change these value to reset qsv codec's max/min qp configuration.
 @item @var{low_delay_brc}
 Supported in h264_qsv and hevc_qsv.
 Change this value to reset qsv codec's low_delay_brc configuration.
+
+@item @var{framerate}
+Change this value to reset qsv codec's framerate configuration.
 @end table
 
 @subsection H264 options
diff --git a/libavcodec/qsvenc.c b/libavcodec/qsvenc.c
index 8bd9272dc6..98d38fd2c7 100644
--- a/libavcodec/qsvenc.c
+++ b/libavcodec/qsvenc.c
@@ -705,6 +705,7 @@ static int init_video_param(AVCodecContext *avctx, QSVEncContext *q)
         q->param.mfx.FrameInfo.FrameRateExtN  = avctx->time_base.den;
         q->param.mfx.FrameInfo.FrameRateExtD  = avctx->time_base.num;
     }
+    q->old_framerate = avctx->framerate;
 
     ret = select_rc_mode(avctx, q);
     if (ret < 0)
@@ -1838,6 +1839,30 @@ static int update_low_delay_brc(AVCodecContext *avctx, QSVEncContext *q)
     return updated;
 }
 
+static int update_frame_rate(AVCodecContext *avctx, QSVEncContext *q)
+{
+    int updated = 0;
+
+    UPDATE_PARAM(q->old_framerate.num, avctx->framerate.num);
+    UPDATE_PARAM(q->old_framerate.den, avctx->framerate.den);
+    if (!updated)
+        return 0;
+
+    if (avctx->framerate.den > 0 && avctx->framerate.num > 0) {
+        q->param.mfx.FrameInfo.FrameRateExtN = avctx->framerate.num;
+        q->param.mfx.FrameInfo.FrameRateExtD = avctx->framerate.den;
+    } else {
+        q->param.mfx.FrameInfo.FrameRateExtN = avctx->time_base.den;
+        q->param.mfx.FrameInfo.FrameRateExtD = avctx->time_base.num;
+    }
+    av_log(avctx, AV_LOG_DEBUG, "Reset framerate: %d/%d (%.2f fps).\n",
+           q->param.mfx.FrameInfo.FrameRateExtN,
+           q->param.mfx.FrameInfo.FrameRateExtD,
+           (double)q->param.mfx.FrameInfo.FrameRateExtN / q->param.mfx.FrameInfo.FrameRateExtD);
+
+    return updated;
+}
+
 static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
                              const AVFrame *frame)
 {
@@ -1851,6 +1876,7 @@ static int update_parameters(AVCodecContext *avctx, QSVEncContext *q,
     needReset |= update_gop_size(avctx, q);
     needReset |= update_rir(avctx, q);
     needReset |= update_low_delay_brc(avctx, q);
+    needReset |= update_frame_rate(avctx, q);
     ret = update_min_max_qp(avctx, q);
     if (ret < 0)
         return ret;
diff --git a/libavcodec/qsvenc.h b/libavcodec/qsvenc.h
index f2b7ee361f..960197f159 100644
--- a/libavcodec/qsvenc.h
+++ b/libavcodec/qsvenc.h
@@ -271,6 +271,8 @@ typedef struct QSVEncContext {
     int old_min_qp_b;
     // This is used for low_delay_brc reset
     int old_low_delay_brc;
+    // This is used for framerate reset
+    AVRational old_framerate;
 } QSVEncContext;
 
 int ff_qsv_enc_init(AVCodecContext *avctx, QSVEncContext *q);