[FFmpeg-devel] [PATCH v2] avcodec/nvenc: High bit depth encoding for HEVC

[Diego Felix de Souza via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

From: Diego Felix de Souza <ddesouza@nvidia.com>

Adding 10-bit encoding support for HEVC if the input is 8-bit. In
case of 8-bit input content, NVENC performs an internal CUDA 8 to
10-bit conversion of the input prior to encoding. Currently, only
AV1 supports encoding 8-bit content as 10-bit.

Signed-off-by: Diego Felix de Souza <ddesouza@nvidia.com>
---
 libavcodec/nvenc.c      | 10 +++++-----
 libavcodec/nvenc_hevc.c |  3 +++
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index 794174a53f..e48224347d 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -514,7 +514,7 @@ static int nvenc_check_capabilities(AVCodecContext *avctx)
     }

     ret = nvenc_check_cap(avctx, NV_ENC_CAPS_SUPPORT_10BIT_ENCODE);
-    if (IS_10BIT(ctx->data_pix_fmt) && ret <= 0) {
+    if ((IS_10BIT(ctx->data_pix_fmt) || ctx->highbitdepth) && ret <= 0) {
         av_log(avctx, AV_LOG_WARNING, "10 bit encode not supported\n");
         return AVERROR(ENOSYS);
     }
@@ -1420,8 +1420,8 @@ static av_cold int nvenc_setup_hevc_config(AVCodecContext *avctx)
         break;
     }

-    // force setting profile as main10 if input is 10 bit
-    if (IS_10BIT(ctx->data_pix_fmt)) {
+    // force setting profile as main10 if input is 10 bit or if it should be encoded as 10 bit
+    if (IS_10BIT(ctx->data_pix_fmt) || ctx->highbitdepth) {
         cc->profileGUID = NV_ENC_HEVC_PROFILE_MAIN10_GUID;
         avctx->profile = AV_PROFILE_HEVC_MAIN_10;
     }
@@ -1435,8 +1435,8 @@ static av_cold int nvenc_setup_hevc_config(AVCodecContext *avctx)
     hevc->chromaFormatIDC = IS_YUV444(ctx->data_pix_fmt) ? 3 : 1;

 #ifdef NVENC_HAVE_NEW_BIT_DEPTH_API
-    hevc->inputBitDepth = hevc->outputBitDepth =
-        IS_10BIT(ctx->data_pix_fmt) ? NV_ENC_BIT_DEPTH_10 : NV_ENC_BIT_DEPTH_8;
+    hevc->inputBitDepth = IS_10BIT(ctx->data_pix_fmt) ? NV_ENC_BIT_DEPTH_10 : NV_ENC_BIT_DEPTH_8;
+    hevc->outputBitDepth = (IS_10BIT(ctx->data_pix_fmt) || ctx->highbitdepth) ? NV_ENC_BIT_DEPTH_10 : NV_ENC_BIT_DEPTH_8;
 #else
     hevc->pixelBitDepthMinus8 = IS_10BIT(ctx->data_pix_fmt) ? 2 : 0;
 #endif
diff --git a/libavcodec/nvenc_hevc.c b/libavcodec/nvenc_hevc.c
index b949cb1bd7..d54e5f2512 100644
--- a/libavcodec/nvenc_hevc.c
+++ b/libavcodec/nvenc_hevc.c
@@ -183,6 +183,9 @@ static const AVOption options[] = {
     { "fullres",      "Two Pass encoding is enabled where first Pass is full resolution",
                                                             0,                    AV_OPT_TYPE_CONST, { .i64 = NV_ENC_TWO_PASS_FULL_RESOLUTION },    0,                          0,                               VE, .unit = "multipass" },
 #endif
+#ifdef NVENC_HAVE_NEW_BIT_DEPTH_API
+    { "highbitdepth", "Enable 10 bit encode for 8 bit input",OFFSET(highbitdepth),AV_OPT_TYPE_BOOL,  { .i64 = 0 }, 0, 1, VE },
+#endif
 #ifdef NVENC_HAVE_LDKFS
     { "ldkfs",        "Low delay key frame scale; Specifies the Scene Change frame size increase allowed in case of single frame VBV and CBR",
                                                             OFFSET(ldkfs),        AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, UCHAR_MAX, VE },
--
2.34.1

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