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avcodec/nvenc: Declare support for P016

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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'.
This commit is contained in:
Philip Langdale 2018-02-25 09:08:06 -08:00
parent 9d5aff09a7
commit 6a89cdc474
2 changed files with 5 additions and 2 deletions
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5
libavcodec/nvenc.c
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@ -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;

2
libavcodec/version.h
View File

@ -29,7 +29,7 @@
#define LIBAVCODEC_VERSION_MAJOR 58
#define LIBAVCODEC_VERSION_MINOR 13
#define LIBAVCODEC_VERSION_MICRO 101
#define LIBAVCODEC_VERSION_MICRO 102
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \