From: Jonas Karlman <[email protected]>
Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit
buffers.
NV15 is a packed 10-bit 4:2:0 Y/CbCr format similar to P010 and P210 but
has no padding between components. Instead, luminance and chrominance
samples are grouped into 4s so that each group is packed into an integer
number of bytes:
YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
The '15' suffix refers to the optimum effective bits per pixel which is
achieved when the total number of luminance samples is a multiple of 8
for NV15.
Signed-off-by: Jonas Karlman <[email protected]>
Signed-off-by: Sebastian Fricke <[email protected]>
---
.../media/v4l/pixfmt-yuv-planar.rst | 53 +++++++++++++++++++
drivers/media/v4l2-core/v4l2-common.c | 2 +
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
include/uapi/linux/videodev2.h | 1 +
4 files changed, 57 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
index a900ff66911a..42ab3fe4667f 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
@@ -79,6 +79,13 @@ All components are stored with the same number of bits per component.
- Cr, Cb
- Yes
- Linear
+ * - V4L2_PIX_FMT_NV15
+ - 'NV15'
+ - 15
+ - 4:2:0
+ - Cb, Cr
+ - Yes
+ - Linear
* - V4L2_PIX_FMT_NV12M
- 'NM12'
- 8
@@ -176,6 +183,7 @@ horizontally.
.. _V4L2-PIX-FMT-NV12:
.. _V4L2-PIX-FMT-NV21:
+.. _V4L2-PIX-FMT-NV15:
.. _V4L2-PIX-FMT-NV12M:
.. _V4L2-PIX-FMT-NV21M:
.. _V4L2-PIX-FMT-P010:
@@ -570,6 +578,51 @@ Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian ord
- Cb\ :sub:`11`
- Cr\ :sub:`11`
+.. _V4L2_PIX_FMT_NV15:
+
+NV15
+----
+
+Like P010 but a packed 10-bit 4:2:0 semi-planar Y/CbCr format without padding between components.
+Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer
+number of bytes:
+YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
+
+.. flat-table:: Sample 4x4 NV15 Image
+ :header-rows: 0
+ :stub-columns: 0
+
+ * - start + 0:
+ - Y'\ :sub:`00`
+ - Y'\ :sub:`01`
+ - Y'\ :sub:`02`
+ - Y'\ :sub:`03`
+ * - start + 8:
+ - Y'\ :sub:`10`
+ - Y'\ :sub:`11`
+ - Y'\ :sub:`12`
+ - Y'\ :sub:`13`
+ * - start + 16:
+ - Y'\ :sub:`20`
+ - Y'\ :sub:`21`
+ - Y'\ :sub:`22`
+ - Y'\ :sub:`23`
+ * - start + 24:
+ - Y'\ :sub:`30`
+ - Y'\ :sub:`31`
+ - Y'\ :sub:`32`
+ - Y'\ :sub:`33`
+ * - start + 32:
+ - Cb\ :sub:`00`
+ - Cr\ :sub:`00`
+ - Cb\ :sub:`01`
+ - Cr\ :sub:`01`
+ * - start + 40:
+ - Cb\ :sub:`10`
+ - Cr\ :sub:`10`
+ - Cb\ :sub:`11`
+ - Cr\ :sub:`11`
+
.. raw:: latex
\endgroup
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 1e38ad8906a2..23a0cb02ea3a 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -262,6 +262,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
/* YUV planar formats */
{ .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
{ .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
+ { .format = V4L2_PIX_FMT_NV15, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 5, 0, 0 }, .hdiv = 2, .vdiv = 2,
+ .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 } },
{ .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index e2526701294e..9e5510cb255e 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1302,6 +1302,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)"; break;
case V4L2_PIX_FMT_NV12: descr = "Y/CbCr 4:2:0"; break;
case V4L2_PIX_FMT_NV21: descr = "Y/CrCb 4:2:0"; break;
+ case V4L2_PIX_FMT_NV15: descr = "10-bit Y/CbCr 4:2:0 (Packed)"; break;
case V4L2_PIX_FMT_NV16: descr = "Y/CbCr 4:2:2"; break;
case V4L2_PIX_FMT_NV61: descr = "Y/CrCb 4:2:2"; break;
case V4L2_PIX_FMT_NV24: descr = "Y/CbCr 4:4:4"; break;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 5a73b92ffe4d..47ff34d6b79f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -598,6 +598,7 @@ struct v4l2_pix_format {
/* two planes -- one Y, one Cr + Cb interleaved */
#define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
#define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
+#define V4L2_PIX_FMT_NV15 v4l2_fourcc('N', 'V', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit packed */
#define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
#define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
#define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
--
2.25.1
Hi Sebastian and Jonas,
Thank you for the patch.
On Wed, Jul 13, 2022 at 06:24:46PM +0200, Sebastian Fricke wrote:
> From: Jonas Karlman <[email protected]>
>
> Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit
> buffers.
>
> NV15 is a packed 10-bit 4:2:0 Y/CbCr format similar to P010 and P210 but
> has no padding between components. Instead, luminance and chrominance
> samples are grouped into 4s so that each group is packed into an integer
> number of bytes:
>
> YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
>
> The '15' suffix refers to the optimum effective bits per pixel which is
> achieved when the total number of luminance samples is a multiple of 8
> for NV15.
>
> Signed-off-by: Jonas Karlman <[email protected]>
> Signed-off-by: Sebastian Fricke <[email protected]>
> ---
> .../media/v4l/pixfmt-yuv-planar.rst | 53 +++++++++++++++++++
> drivers/media/v4l2-core/v4l2-common.c | 2 +
> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
> include/uapi/linux/videodev2.h | 1 +
> 4 files changed, 57 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> index a900ff66911a..42ab3fe4667f 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> @@ -79,6 +79,13 @@ All components are stored with the same number of bits per component.
> - Cr, Cb
> - Yes
> - Linear
> + * - V4L2_PIX_FMT_NV15
> + - 'NV15'
> + - 15
> + - 4:2:0
> + - Cb, Cr
> + - Yes
> + - Linear
> * - V4L2_PIX_FMT_NV12M
> - 'NM12'
> - 8
> @@ -176,6 +183,7 @@ horizontally.
>
> .. _V4L2-PIX-FMT-NV12:
> .. _V4L2-PIX-FMT-NV21:
> +.. _V4L2-PIX-FMT-NV15:
> .. _V4L2-PIX-FMT-NV12M:
> .. _V4L2-PIX-FMT-NV21M:
> .. _V4L2-PIX-FMT-P010:
> @@ -570,6 +578,51 @@ Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian ord
> - Cb\ :sub:`11`
> - Cr\ :sub:`11`
>
> +.. _V4L2_PIX_FMT_NV15:
> +
> +NV15
> +----
> +
> +Like P010 but a packed 10-bit 4:2:0 semi-planar Y/CbCr format without padding between components.
"packed 10-bit semi-planar" sounds confusing, as "packed YUV" usually
refers to YUYV-style formats, but I'm not sure how to express that
better.
> +Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer
> +number of bytes:
Could you please wrap the description at 80 columns ?
> +YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
> +
> +.. flat-table:: Sample 4x4 NV15 Image
> + :header-rows: 0
> + :stub-columns: 0
> +
> + * - start + 0:
> + - Y'\ :sub:`00`
> + - Y'\ :sub:`01`
> + - Y'\ :sub:`02`
> + - Y'\ :sub:`03`
> + * - start + 8:
> + - Y'\ :sub:`10`
> + - Y'\ :sub:`11`
> + - Y'\ :sub:`12`
> + - Y'\ :sub:`13`
> + * - start + 16:
> + - Y'\ :sub:`20`
> + - Y'\ :sub:`21`
> + - Y'\ :sub:`22`
> + - Y'\ :sub:`23`
> + * - start + 24:
> + - Y'\ :sub:`30`
> + - Y'\ :sub:`31`
> + - Y'\ :sub:`32`
> + - Y'\ :sub:`33`
> + * - start + 32:
> + - Cb\ :sub:`00`
> + - Cr\ :sub:`00`
> + - Cb\ :sub:`01`
> + - Cr\ :sub:`01`
> + * - start + 40:
> + - Cb\ :sub:`10`
> + - Cr\ :sub:`10`
> + - Cb\ :sub:`11`
> + - Cr\ :sub:`11`
This doesn't look right. You need to describe the data at the bit level,
so show how the 10-bit samples are packed into bytes.
> +
> .. raw:: latex
>
> \endgroup
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index 1e38ad8906a2..23a0cb02ea3a 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -262,6 +262,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
> /* YUV planar formats */
> { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> + { .format = V4L2_PIX_FMT_NV15, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 5, 0, 0 }, .hdiv = 2, .vdiv = 2,
> + .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 } },
> { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index e2526701294e..9e5510cb255e 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1302,6 +1302,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)"; break;
> case V4L2_PIX_FMT_NV12: descr = "Y/CbCr 4:2:0"; break;
> case V4L2_PIX_FMT_NV21: descr = "Y/CrCb 4:2:0"; break;
> + case V4L2_PIX_FMT_NV15: descr = "10-bit Y/CbCr 4:2:0 (Packed)"; break;
> case V4L2_PIX_FMT_NV16: descr = "Y/CbCr 4:2:2"; break;
> case V4L2_PIX_FMT_NV61: descr = "Y/CrCb 4:2:2"; break;
> case V4L2_PIX_FMT_NV24: descr = "Y/CbCr 4:4:4"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 5a73b92ffe4d..47ff34d6b79f 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -598,6 +598,7 @@ struct v4l2_pix_format {
> /* two planes -- one Y, one Cr + Cb interleaved */
> #define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
> #define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
> +#define V4L2_PIX_FMT_NV15 v4l2_fourcc('N', 'V', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit packed */
> #define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
> #define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
> #define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
--
Regards,
Laurent Pinchart
Le mercredi 13 juillet 2022 à 21:28 +0300, Laurent Pinchart a écrit :
> Hi Sebastian and Jonas,
>
> Thank you for the patch.
>
> On Wed, Jul 13, 2022 at 06:24:46PM +0200, Sebastian Fricke wrote:
> > From: Jonas Karlman <[email protected]>
> >
> > Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit
> > buffers.
> >
> > NV15 is a packed 10-bit 4:2:0 Y/CbCr format similar to P010 and P210 but
> > has no padding between components. Instead, luminance and chrominance
> > samples are grouped into 4s so that each group is packed into an integer
> > number of bytes:
> >
> > YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
> >
> > The '15' suffix refers to the optimum effective bits per pixel which is
> > achieved when the total number of luminance samples is a multiple of 8
> > for NV15.
> >
> > Signed-off-by: Jonas Karlman <[email protected]>
> > Signed-off-by: Sebastian Fricke <[email protected]>
> > ---
> > .../media/v4l/pixfmt-yuv-planar.rst | 53 +++++++++++++++++++
> > drivers/media/v4l2-core/v4l2-common.c | 2 +
> > drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
> > include/uapi/linux/videodev2.h | 1 +
> > 4 files changed, 57 insertions(+)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > index a900ff66911a..42ab3fe4667f 100644
> > --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > @@ -79,6 +79,13 @@ All components are stored with the same number of bits per component.
> > - Cr, Cb
> > - Yes
> > - Linear
> > + * - V4L2_PIX_FMT_NV15
> > + - 'NV15'
> > + - 15
> > + - 4:2:0
> > + - Cb, Cr
> > + - Yes
> > + - Linear
> > * - V4L2_PIX_FMT_NV12M
> > - 'NM12'
> > - 8
> > @@ -176,6 +183,7 @@ horizontally.
> >
> > .. _V4L2-PIX-FMT-NV12:
> > .. _V4L2-PIX-FMT-NV21:
> > +.. _V4L2-PIX-FMT-NV15:
> > .. _V4L2-PIX-FMT-NV12M:
> > .. _V4L2-PIX-FMT-NV21M:
> > .. _V4L2-PIX-FMT-P010:
> > @@ -570,6 +578,51 @@ Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian ord
> > - Cb\ :sub:`11`
> > - Cr\ :sub:`11`
> >
> > +.. _V4L2_PIX_FMT_NV15:
> > +
> > +NV15
> > +----
> > +
> > +Like P010 but a packed 10-bit 4:2:0 semi-planar Y/CbCr format without padding between components.
>
> "packed 10-bit semi-planar" sounds confusing, as "packed YUV" usually
> refers to YUYV-style formats, but I'm not sure how to express that
> better.
Perhaps:
"Similar to P010 (10-bit 4:":0 semi-planer Y/CbCr), though unlike P010, the
there is not padding between components."
>
> > +Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer
> > +number of bytes:
>
> Could you please wrap the description at 80 columns ?
>
> > +YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
> > +
> > +.. flat-table:: Sample 4x4 NV15 Image
> > + :header-rows: 0
> > + :stub-columns: 0
> > +
> > + * - start + 0:
> > + - Y'\ :sub:`00`
> > + - Y'\ :sub:`01`
> > + - Y'\ :sub:`02`
> > + - Y'\ :sub:`03`
> > + * - start + 8:
> > + - Y'\ :sub:`10`
> > + - Y'\ :sub:`11`
> > + - Y'\ :sub:`12`
> > + - Y'\ :sub:`13`
> > + * - start + 16:
> > + - Y'\ :sub:`20`
> > + - Y'\ :sub:`21`
> > + - Y'\ :sub:`22`
> > + - Y'\ :sub:`23`
> > + * - start + 24:
> > + - Y'\ :sub:`30`
> > + - Y'\ :sub:`31`
> > + - Y'\ :sub:`32`
> > + - Y'\ :sub:`33`
> > + * - start + 32:
> > + - Cb\ :sub:`00`
> > + - Cr\ :sub:`00`
> > + - Cb\ :sub:`01`
> > + - Cr\ :sub:`01`
> > + * - start + 40:
> > + - Cb\ :sub:`10`
> > + - Cr\ :sub:`10`
> > + - Cb\ :sub:`11`
> > + - Cr\ :sub:`11`
>
> This doesn't look right. You need to describe the data at the bit level,
> so show how the 10-bit samples are packed into bytes.
A word of NV15 is 40 bits, so 1 word of NV12 is 5 bytes, 4 pixels. I believe
there is no choice here but to describe 4 pixels for Y plane, and 4 pixels for
CbCr plane. This might be a bit big though.
>
> > +
> > .. raw:: latex
> >
> > \endgroup
> > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> > index 1e38ad8906a2..23a0cb02ea3a 100644
> > --- a/drivers/media/v4l2-core/v4l2-common.c
> > +++ b/drivers/media/v4l2-core/v4l2-common.c
> > @@ -262,6 +262,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
> > /* YUV planar formats */
> > { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > + { .format = V4L2_PIX_FMT_NV15, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 5, 0, 0 }, .hdiv = 2, .vdiv = 2,
> > + .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 } },
> > { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> > index e2526701294e..9e5510cb255e 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -1302,6 +1302,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> > case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)"; break;
> > case V4L2_PIX_FMT_NV12: descr = "Y/CbCr 4:2:0"; break;
> > case V4L2_PIX_FMT_NV21: descr = "Y/CrCb 4:2:0"; break;
> > + case V4L2_PIX_FMT_NV15: descr = "10-bit Y/CbCr 4:2:0 (Packed)"; break;
> > case V4L2_PIX_FMT_NV16: descr = "Y/CbCr 4:2:2"; break;
> > case V4L2_PIX_FMT_NV61: descr = "Y/CrCb 4:2:2"; break;
> > case V4L2_PIX_FMT_NV24: descr = "Y/CbCr 4:4:4"; break;
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 5a73b92ffe4d..47ff34d6b79f 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -598,6 +598,7 @@ struct v4l2_pix_format {
> > /* two planes -- one Y, one Cr + Cb interleaved */
> > #define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
> > #define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
> > +#define V4L2_PIX_FMT_NV15 v4l2_fourcc('N', 'V', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit packed */
> > #define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
> > #define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
> > #define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
>
On Thu, Jul 14, 2022 at 09:02:38AM -0400, Nicolas Dufresne wrote:
> Le mercredi 13 juillet 2022 à 21:28 +0300, Laurent Pinchart a écrit :
> > Hi Sebastian and Jonas,
> >
> > Thank you for the patch.
> >
> > On Wed, Jul 13, 2022 at 06:24:46PM +0200, Sebastian Fricke wrote:
> > > From: Jonas Karlman <[email protected]>
> > >
> > > Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit
> > > buffers.
> > >
> > > NV15 is a packed 10-bit 4:2:0 Y/CbCr format similar to P010 and P210 but
> > > has no padding between components. Instead, luminance and chrominance
> > > samples are grouped into 4s so that each group is packed into an integer
> > > number of bytes:
> > >
> > > YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
> > >
> > > The '15' suffix refers to the optimum effective bits per pixel which is
> > > achieved when the total number of luminance samples is a multiple of 8
> > > for NV15.
> > >
> > > Signed-off-by: Jonas Karlman <[email protected]>
> > > Signed-off-by: Sebastian Fricke <[email protected]>
> > > ---
> > > .../media/v4l/pixfmt-yuv-planar.rst | 53 +++++++++++++++++++
> > > drivers/media/v4l2-core/v4l2-common.c | 2 +
> > > drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
> > > include/uapi/linux/videodev2.h | 1 +
> > > 4 files changed, 57 insertions(+)
> > >
> > > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > > index a900ff66911a..42ab3fe4667f 100644
> > > --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > > +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > > @@ -79,6 +79,13 @@ All components are stored with the same number of bits per component.
> > > - Cr, Cb
> > > - Yes
> > > - Linear
> > > + * - V4L2_PIX_FMT_NV15
> > > + - 'NV15'
> > > + - 15
> > > + - 4:2:0
> > > + - Cb, Cr
> > > + - Yes
> > > + - Linear
> > > * - V4L2_PIX_FMT_NV12M
> > > - 'NM12'
> > > - 8
> > > @@ -176,6 +183,7 @@ horizontally.
> > >
> > > .. _V4L2-PIX-FMT-NV12:
> > > .. _V4L2-PIX-FMT-NV21:
> > > +.. _V4L2-PIX-FMT-NV15:
> > > .. _V4L2-PIX-FMT-NV12M:
> > > .. _V4L2-PIX-FMT-NV21M:
> > > .. _V4L2-PIX-FMT-P010:
> > > @@ -570,6 +578,51 @@ Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian ord
> > > - Cb\ :sub:`11`
> > > - Cr\ :sub:`11`
> > >
> > > +.. _V4L2_PIX_FMT_NV15:
> > > +
> > > +NV15
> > > +----
> > > +
> > > +Like P010 but a packed 10-bit 4:2:0 semi-planar Y/CbCr format without padding between components.
> >
> > "packed 10-bit semi-planar" sounds confusing, as "packed YUV" usually
> > refers to YUYV-style formats, but I'm not sure how to express that
> > better.
>
> Perhaps:
>
> "Similar to P010 (10-bit 4:":0 semi-planer Y/CbCr), though unlike P010, the
> there is not padding between components."
>
> > > +Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer
> > > +number of bytes:
> >
> > Could you please wrap the description at 80 columns ?
> >
> > > +YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
> > > +
> > > +.. flat-table:: Sample 4x4 NV15 Image
> > > + :header-rows: 0
> > > + :stub-columns: 0
> > > +
> > > + * - start + 0:
> > > + - Y'\ :sub:`00`
> > > + - Y'\ :sub:`01`
> > > + - Y'\ :sub:`02`
> > > + - Y'\ :sub:`03`
> > > + * - start + 8:
> > > + - Y'\ :sub:`10`
> > > + - Y'\ :sub:`11`
> > > + - Y'\ :sub:`12`
> > > + - Y'\ :sub:`13`
> > > + * - start + 16:
> > > + - Y'\ :sub:`20`
> > > + - Y'\ :sub:`21`
> > > + - Y'\ :sub:`22`
> > > + - Y'\ :sub:`23`
> > > + * - start + 24:
> > > + - Y'\ :sub:`30`
> > > + - Y'\ :sub:`31`
> > > + - Y'\ :sub:`32`
> > > + - Y'\ :sub:`33`
> > > + * - start + 32:
> > > + - Cb\ :sub:`00`
> > > + - Cr\ :sub:`00`
> > > + - Cb\ :sub:`01`
> > > + - Cr\ :sub:`01`
> > > + * - start + 40:
> > > + - Cb\ :sub:`10`
> > > + - Cr\ :sub:`10`
> > > + - Cb\ :sub:`11`
> > > + - Cr\ :sub:`11`
> >
> > This doesn't look right. You need to describe the data at the bit level,
> > so show how the 10-bit samples are packed into bytes.
>
> A word of NV15 is 40 bits, so 1 word of NV12 is 5 bytes, 4 pixels. I believe
> there is no choice here but to describe 4 pixels for Y plane, and 4 pixels for
> CbCr plane. This might be a bit big though.
I agree, it may not be the prettiest, but I'd rather have a larger table
than a format that is understood differently by different drivers. Been
there, done that, not again :-)
> > > +
> > > .. raw:: latex
> > >
> > > \endgroup
> > > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> > > index 1e38ad8906a2..23a0cb02ea3a 100644
> > > --- a/drivers/media/v4l2-core/v4l2-common.c
> > > +++ b/drivers/media/v4l2-core/v4l2-common.c
> > > @@ -262,6 +262,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
> > > /* YUV planar formats */
> > > { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > > { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > > + { .format = V4L2_PIX_FMT_NV15, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 5, 0, 0 }, .hdiv = 2, .vdiv = 2,
> > > + .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 } },
> > > { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > > { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > > { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> > > index e2526701294e..9e5510cb255e 100644
> > > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > > @@ -1302,6 +1302,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> > > case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)"; break;
> > > case V4L2_PIX_FMT_NV12: descr = "Y/CbCr 4:2:0"; break;
> > > case V4L2_PIX_FMT_NV21: descr = "Y/CrCb 4:2:0"; break;
> > > + case V4L2_PIX_FMT_NV15: descr = "10-bit Y/CbCr 4:2:0 (Packed)"; break;
> > > case V4L2_PIX_FMT_NV16: descr = "Y/CbCr 4:2:2"; break;
> > > case V4L2_PIX_FMT_NV61: descr = "Y/CrCb 4:2:2"; break;
> > > case V4L2_PIX_FMT_NV24: descr = "Y/CbCr 4:4:4"; break;
> > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > > index 5a73b92ffe4d..47ff34d6b79f 100644
> > > --- a/include/uapi/linux/videodev2.h
> > > +++ b/include/uapi/linux/videodev2.h
> > > @@ -598,6 +598,7 @@ struct v4l2_pix_format {
> > > /* two planes -- one Y, one Cr + Cb interleaved */
> > > #define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
> > > #define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
> > > +#define V4L2_PIX_FMT_NV15 v4l2_fourcc('N', 'V', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit packed */
> > > #define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
> > > #define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
> > > #define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
--
Regards,
Laurent Pinchart
Hey Laurent and Nicolas,
On 15.07.2022 03:04, Laurent Pinchart wrote:
>On Thu, Jul 14, 2022 at 09:02:38AM -0400, Nicolas Dufresne wrote:
>> Le mercredi 13 juillet 2022 à 21:28 +0300, Laurent Pinchart a écrit :
>> > Hi Sebastian and Jonas,
>> >
>> > Thank you for the patch.
Thank you for your review :).
>> >
>> > On Wed, Jul 13, 2022 at 06:24:46PM +0200, Sebastian Fricke wrote:
>> > > From: Jonas Karlman <[email protected]>
>> > >
>> > > Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit
>> > > buffers.
>> > >
>> > > NV15 is a packed 10-bit 4:2:0 Y/CbCr format similar to P010 and P210 but
>> > > has no padding between components. Instead, luminance and chrominance
>> > > samples are grouped into 4s so that each group is packed into an integer
>> > > number of bytes:
>> > >
>> > > YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
>> > >
>> > > The '15' suffix refers to the optimum effective bits per pixel which is
>> > > achieved when the total number of luminance samples is a multiple of 8
>> > > for NV15.
>> > >
>> > > Signed-off-by: Jonas Karlman <[email protected]>
>> > > Signed-off-by: Sebastian Fricke <[email protected]>
>> > > ---
>> > > .../media/v4l/pixfmt-yuv-planar.rst | 53 +++++++++++++++++++
>> > > drivers/media/v4l2-core/v4l2-common.c | 2 +
>> > > drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>> > > include/uapi/linux/videodev2.h | 1 +
>> > > 4 files changed, 57 insertions(+)
>> > >
>> > > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> > > index a900ff66911a..42ab3fe4667f 100644
>> > > --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> > > +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
>> > > @@ -79,6 +79,13 @@ All components are stored with the same number of bits per component.
>> > > - Cr, Cb
>> > > - Yes
>> > > - Linear
>> > > + * - V4L2_PIX_FMT_NV15
>> > > + - 'NV15'
>> > > + - 15
>> > > + - 4:2:0
>> > > + - Cb, Cr
>> > > + - Yes
>> > > + - Linear
>> > > * - V4L2_PIX_FMT_NV12M
>> > > - 'NM12'
>> > > - 8
>> > > @@ -176,6 +183,7 @@ horizontally.
>> > >
>> > > .. _V4L2-PIX-FMT-NV12:
>> > > .. _V4L2-PIX-FMT-NV21:
>> > > +.. _V4L2-PIX-FMT-NV15:
>> > > .. _V4L2-PIX-FMT-NV12M:
>> > > .. _V4L2-PIX-FMT-NV21M:
>> > > .. _V4L2-PIX-FMT-P010:
>> > > @@ -570,6 +578,51 @@ Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian ord
>> > > - Cb\ :sub:`11`
>> > > - Cr\ :sub:`11`
>> > >
>> > > +.. _V4L2_PIX_FMT_NV15:
>> > > +
>> > > +NV15
>> > > +----
>> > > +
>> > > +Like P010 but a packed 10-bit 4:2:0 semi-planar Y/CbCr format without padding between components.
>> >
>> > "packed 10-bit semi-planar" sounds confusing, as "packed YUV" usually
>> > refers to YUYV-style formats, but I'm not sure how to express that
>> > better.
>>
>> Perhaps:
>>
>> "Similar to P010 (10-bit 4:":0 semi-planer Y/CbCr), though unlike P010, the
>> there is not padding between components."
I'll take that for V2.
>>
>> > > +Instead, luminance and chrominance samples are grouped into 4s so that each group is packed into an integer
>> > > +number of bytes:
>> >
>> > Could you please wrap the description at 80 columns ?
Will do.
>> >
>> > > +YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
>> > > +
>> > > +.. flat-table:: Sample 4x4 NV15 Image
>> > > + :header-rows: 0
>> > > + :stub-columns: 0
>> > > +
>> > > + * - start + 0:
>> > > + - Y'\ :sub:`00`
>> > > + - Y'\ :sub:`01`
>> > > + - Y'\ :sub:`02`
>> > > + - Y'\ :sub:`03`
>> > > + * - start + 8:
>> > > + - Y'\ :sub:`10`
>> > > + - Y'\ :sub:`11`
>> > > + - Y'\ :sub:`12`
>> > > + - Y'\ :sub:`13`
>> > > + * - start + 16:
>> > > + - Y'\ :sub:`20`
>> > > + - Y'\ :sub:`21`
>> > > + - Y'\ :sub:`22`
>> > > + - Y'\ :sub:`23`
>> > > + * - start + 24:
>> > > + - Y'\ :sub:`30`
>> > > + - Y'\ :sub:`31`
>> > > + - Y'\ :sub:`32`
>> > > + - Y'\ :sub:`33`
>> > > + * - start + 32:
>> > > + - Cb\ :sub:`00`
>> > > + - Cr\ :sub:`00`
>> > > + - Cb\ :sub:`01`
>> > > + - Cr\ :sub:`01`
>> > > + * - start + 40:
>> > > + - Cb\ :sub:`10`
>> > > + - Cr\ :sub:`10`
>> > > + - Cb\ :sub:`11`
>> > > + - Cr\ :sub:`11`
>> >
>> > This doesn't look right. You need to describe the data at the bit level,
>> > so show how the 10-bit samples are packed into bytes.
>>
>> A word of NV15 is 40 bits, so 1 word of NV12 is 5 bytes, 4 pixels. I believe
>> there is no choice here but to describe 4 pixels for Y plane, and 4 pixels for
>> CbCr plane. This might be a bit big though.
>
>I agree, it may not be the prettiest, but I'd rather have a larger table
>than a format that is understood differently by different drivers. Been
>there, done that, not again :-)
I'll prepare something for V2 (at my current workload in about 3 weeks
at the earliest).
Greetings,
Sebastian
>
>> > > +
>> > > .. raw:: latex
>> > >
>> > > \endgroup
>> > > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
>> > > index 1e38ad8906a2..23a0cb02ea3a 100644
>> > > --- a/drivers/media/v4l2-core/v4l2-common.c
>> > > +++ b/drivers/media/v4l2-core/v4l2-common.c
>> > > @@ -262,6 +262,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
>> > > /* YUV planar formats */
>> > > { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
>> > > { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
>> > > + { .format = V4L2_PIX_FMT_NV15, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 5, 0, 0 }, .hdiv = 2, .vdiv = 2,
>> > > + .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 } },
>> > > { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
>> > > { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
>> > > { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>> > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>> > > index e2526701294e..9e5510cb255e 100644
>> > > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> > > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> > > @@ -1302,6 +1302,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>> > > case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)"; break;
>> > > case V4L2_PIX_FMT_NV12: descr = "Y/CbCr 4:2:0"; break;
>> > > case V4L2_PIX_FMT_NV21: descr = "Y/CrCb 4:2:0"; break;
>> > > + case V4L2_PIX_FMT_NV15: descr = "10-bit Y/CbCr 4:2:0 (Packed)"; break;
>> > > case V4L2_PIX_FMT_NV16: descr = "Y/CbCr 4:2:2"; break;
>> > > case V4L2_PIX_FMT_NV61: descr = "Y/CrCb 4:2:2"; break;
>> > > case V4L2_PIX_FMT_NV24: descr = "Y/CbCr 4:4:4"; break;
>> > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>> > > index 5a73b92ffe4d..47ff34d6b79f 100644
>> > > --- a/include/uapi/linux/videodev2.h
>> > > +++ b/include/uapi/linux/videodev2.h
>> > > @@ -598,6 +598,7 @@ struct v4l2_pix_format {
>> > > /* two planes -- one Y, one Cr + Cb interleaved */
>> > > #define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
>> > > #define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
>> > > +#define V4L2_PIX_FMT_NV15 v4l2_fourcc('N', 'V', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit packed */
>> > > #define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
>> > > #define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
>> > > #define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
>
>--
>Regards,
>
>Laurent Pinchart