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| author | Philip Langdale <philipl@overt.org> | 2018-02-25 09:08:06 -0800 |
|---|---|---|
| committer | Philip Langdale <philipl@overt.org> | 2018-03-02 14:52:48 -0800 |
| commit | 6a89cdc474bc1a2a276dff63629784d68b9cab6e (patch) | |
| tree | 020f727e9954ac94d81ec5d1443cfaf30e3a34c6 /libavcodec/nvenc.c | |
| parent | 9d5aff09a7163b17ec98f8c712ddde7727372dbc (diff) | |
| download | ffmpeg-6a89cdc474bc1a2a276dff63629784d68b9cab6e.tar.gz | |
avcodec/nvenc: Declare support for P016
nvenc doesn't support P016, but we have two problems today:
1) We declare support for YUV444P16 which nvenc also doesn't support.
We do this because it's the only pix_fmt we have that can
approximate nvenc's internal format that is YUV444P10 with data in
MSBs instead of LSBs. Because the declared format is a 16bit one,
it will be preferrentially chosen when encoding >10bit content,
but that content will normally be YUV420P12 or P016 which should
get mapped to P010 and not YUV444P10.
2) Transcoding P016 content with nvenc should be possible in a pure
hardware pipeline, and that can't be done if nvenc doesn't say it
accepts P016. By mapping it to P010, we can use it, albeit with
truncation. I have established that swscale doesn't know how to
dither to 10bits so we'd get truncation anyway, even if we tried
to do this 'properly'.
Diffstat (limited to 'libavcodec/nvenc.c')
| -rw-r--r-- | libavcodec/nvenc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c index 39c3aa1fbb..1f601a63bd 100644 --- a/libavcodec/nvenc.c +++ b/libavcodec/nvenc.c @@ -41,7 +41,8 @@ const enum AVPixelFormat ff_nvenc_pix_fmts[] = { AV_PIX_FMT_NV12, AV_PIX_FMT_P010, AV_PIX_FMT_YUV444P, - AV_PIX_FMT_YUV444P16, + AV_PIX_FMT_P016, // Truncated to 10bits + AV_PIX_FMT_YUV444P16, // Truncated to 10bits AV_PIX_FMT_0RGB32, AV_PIX_FMT_0BGR32, AV_PIX_FMT_CUDA, @@ -52,6 +53,7 @@ const enum AVPixelFormat ff_nvenc_pix_fmts[] = { }; #define IS_10BIT(pix_fmt) (pix_fmt == AV_PIX_FMT_P010 || \ + pix_fmt == AV_PIX_FMT_P016 || \ pix_fmt == AV_PIX_FMT_YUV444P16) #define IS_YUV444(pix_fmt) (pix_fmt == AV_PIX_FMT_YUV444P || \ @@ -1219,6 +1221,7 @@ static NV_ENC_BUFFER_FORMAT nvenc_map_buffer_format(enum AVPixelFormat pix_fmt) case AV_PIX_FMT_NV12: return NV_ENC_BUFFER_FORMAT_NV12_PL; case AV_PIX_FMT_P010: + case AV_PIX_FMT_P016: return NV_ENC_BUFFER_FORMAT_YUV420_10BIT; case AV_PIX_FMT_YUV444P: return NV_ENC_BUFFER_FORMAT_YUV444_PL; |