From 3756525a59cc63db431fc301ea3748958964af16 Mon Sep 17 00:00:00 2001
From: Limin Wang <lance.lmwang@gmail.com>
Date: Thu, 2 Sep 2021 18:38:57 +0800
Subject: [PATCH] avcodec/nvenc: add single slice intra refresh support

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
---
 libavcodec/nvenc.c      | 25 ++++++++++++++++++++++++-
 libavcodec/nvenc.h      |  2 ++
 libavcodec/nvenc_h264.c |  2 ++
 libavcodec/nvenc_hevc.c |  2 ++
 4 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index 41963e4d21..ff7c9d6542 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -529,8 +529,21 @@ static int nvenc_check_capabilities(AVCodecContext *avctx)
     }
 #endif
 
+#ifdef NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
+    ret = nvenc_check_cap(avctx, NV_ENC_CAPS_SINGLE_SLICE_INTRA_REFRESH);
+    if(ctx->single_slice_intra_refresh && ret <= 0) {
+        av_log(avctx, AV_LOG_WARNING, "Single slice intra refresh not supported by the device\n");
+        return AVERROR(ENOSYS);
+    }
+#else
+    if(ctx->single_slice_intra_refresh) {
+        av_log(avctx, AV_LOG_WARNING, "Single slice intra refresh needs SDK 11.1 at build time\n");
+        return AVERROR(ENOSYS);
+    }
+#endif
+
     ret = nvenc_check_cap(avctx, NV_ENC_CAPS_SUPPORT_INTRA_REFRESH);
-    if(ctx->intra_refresh && ret <= 0) {
+    if((ctx->intra_refresh || ctx->single_slice_intra_refresh) && ret <= 0) {
         av_log(avctx, AV_LOG_WARNING, "Intra refresh not supported by the device\n");
         return AVERROR(ENOSYS);
     }
@@ -1086,6 +1099,9 @@ static av_cold int nvenc_setup_h264_config(AVCodecContext *avctx)
         h264->enableIntraRefresh = 1;
         h264->intraRefreshPeriod = avctx->gop_size;
         h264->intraRefreshCnt = avctx->gop_size - 1;
+#ifdef NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
+        h264->singleSliceIntraRefresh = ctx->single_slice_intra_refresh;
+#endif
     }
 
     h264->disableSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
@@ -1192,6 +1208,9 @@ static av_cold int nvenc_setup_hevc_config(AVCodecContext *avctx)
         hevc->enableIntraRefresh = 1;
         hevc->intraRefreshPeriod = avctx->gop_size;
         hevc->intraRefreshCnt = avctx->gop_size - 1;
+#ifdef NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
+        hevc->singleSliceIntraRefresh = ctx->single_slice_intra_refresh;
+#endif
     }
 
     hevc->disableSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
@@ -1391,6 +1410,10 @@ static av_cold int nvenc_setup_encoder(AVCodecContext *avctx)
         ctx->encode_config.gopLength = 1;
     }
 
+    /* force to enable intra refresh */
+    if(ctx->single_slice_intra_refresh)
+        ctx->intra_refresh = 1;
+
     if (ctx->intra_refresh)
         ctx->encode_config.gopLength = NVENC_INFINITE_GOPLENGTH;
 
diff --git a/libavcodec/nvenc.h b/libavcodec/nvenc.h
index e7cc0e6ba0..1e756a6f72 100644
--- a/libavcodec/nvenc.h
+++ b/libavcodec/nvenc.h
@@ -73,6 +73,7 @@ typedef void ID3D11Device;
 // SDK 11.1 compile time feature checks
 #if NVENCAPI_CHECK_VERSION(11, 1)
 #define NVENC_HAVE_QP_CHROMA_OFFSETS
+#define NVENC_HAVE_SINGLE_SLICE_INTRA_REFRESH
 #endif
 
 typedef struct NvencSurface
@@ -231,6 +232,7 @@ typedef struct NvencContext
     int ldkfs;
     int extra_sei;
     int intra_refresh;
+    int single_slice_intra_refresh;
 } NvencContext;
 
 int ff_nvenc_encode_init(AVCodecContext *avctx);
diff --git a/libavcodec/nvenc_h264.c b/libavcodec/nvenc_h264.c
index f00755530e..ab5263368e 100644
--- a/libavcodec/nvenc_h264.c
+++ b/libavcodec/nvenc_h264.c
@@ -190,6 +190,8 @@ static const AVOption options[] = {
                                                             OFFSET(extra_sei),    AV_OPT_TYPE_BOOL,  { .i64 = 1 }, 0, 1, VE },
     { "intra-refresh","Use Periodic Intra Refresh instead of IDR frames",
                                                             OFFSET(intra_refresh),AV_OPT_TYPE_BOOL,  { .i64 = 0 }, 0, 1, VE },
+    { "single-slice-intra-refresh", "Use single slice intra refresh",
+                                                            OFFSET(single_slice_intra_refresh), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
     { NULL }
 };
 
diff --git a/libavcodec/nvenc_hevc.c b/libavcodec/nvenc_hevc.c
index efddd990e4..d8cfeca7a9 100644
--- a/libavcodec/nvenc_hevc.c
+++ b/libavcodec/nvenc_hevc.c
@@ -171,6 +171,8 @@ static const AVOption options[] = {
                                                             OFFSET(extra_sei),    AV_OPT_TYPE_BOOL,  { .i64 = 1 }, 0, 1, VE },
     { "intra-refresh","Use Periodic Intra Refresh instead of IDR frames",
                                                             OFFSET(intra_refresh),AV_OPT_TYPE_BOOL,  { .i64 = 0 }, 0, 1, VE },
+    { "single-slice-intra-refresh", "Use single slice intra refresh",
+                                                            OFFSET(single_slice_intra_refresh), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
     { NULL }
 };