Re: [PATCH v2 01/12] media: v4l2: Add NV15 pixel format

From: Nicolas Dufresne
Date: Thu Feb 16 2023 - 12:00:27 EST

Le jeudi 16 février 2023 à 16:57 +0800, Hsia-Jun Li a écrit :
>
> On 1/12/23 20:56, Sebastian Fricke wrote:
> > CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> >
> >
> > From: Jonas Karlman <jonas@xxxxxxxxx>
> >
> > Add the NV15 pixel format used by the Rockchip Video Decoder for 10-bit buffers.
> >
> I think this pixel format in the Rockchip platform supports multiple
> planes buffers. It is all right not to add more variant until the ext
> pixel format and buffer APIs are merged.
>
> I just want to mention the need of this.

Can you extend, I don't see that support in rkvdec driver (nor in mpp).

/* config output base address */
dst_addr = vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0);
writel_relaxed(dst_addr, rkvdec->regs + RKVDEC_REG_DECOUT_BASE);

reg = RKVDEC_Y_VIRSTRIDE(y_virstride / 16);
writel_relaxed(reg, rkvdec->regs + RKVDEC_REG_Y_VIRSTRIDE);

reg = RKVDEC_YUV_VIRSTRIDE(yuv_virstride / 16);
writel_relaxed(reg, rkvdec->regs + RKVDEC_REG_YUV_VIRSTRIDE);

That looks like a base address and 2 strides only. For NV15M (multiple
allocation) you'd need 2 addresses. It could be that RGA or newer chip have that
support, but as you know, we add formats only when actually using them.

regards,
Nicolas

> > 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 <jonas@xxxxxxxxx>
> > Signed-off-by: Sebastian Fricke <sebastian.fricke@xxxxxxxxxxxxx>
> > ---
> > .../userspace-api/media/v4l/pixfmt-yuv-planar.rst | 75 ++++++++++++++++++++++
> > 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, 79 insertions(+)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> > index f1d5bb7b806d..7d8d228f8063 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
> > @@ -183,6 +190,7 @@ 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:
> > @@ -586,6 +594,73 @@ 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
> > +----
> > +
> > +Similar to P010, a semi-planar 10-bit Y/CbCr format, but all components are
> > +packed without any padding between each other. As a side-effect, each group of
> > +4 components are stored over 5 bytes (YYYY or 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:`04`
> > + - Y'\ :sub:`10`
> > + - Y'\ :sub:`11`
> > + - Y'\ :sub:`12`
> > + * - start + 16:
> > + - Y'\ :sub:`13`
> > + - Y'\ :sub:`14`
> > + - Y'\ :sub:`20`
> > + - Y'\ :sub:`21`
> > + * - start + 24:
> > + - Y'\ :sub:`22`
> > + - Y'\ :sub:`23`
> > + - Y'\ :sub:`24`
> > + - Y'\ :sub:`30`
> > + * - start + 32:
> > + - Y'\ :sub:`31`
> > + - Y'\ :sub:`32`
> > + - Y'\ :sub:`33`
> > + - Y'\ :sub:`34`
> > +
> > + * - start + 0:
> > + - Cb\ :sub:`00`
> > + - Cr\ :sub:`00`
> > + - Cb\ :sub:`01`
> > + - Cr\ :sub:`01`
> > + * - start + 8:
> > + - Cb\ :sub:`02`
> > + - Cr\ :sub:`02`
> > + - Cb\ :sub:`03`
> > + - Cr\ :sub:`03`
> > + * - start + 16:
> > + - Cb\ :sub:`04`
> > + - Cr\ :sub:`04`
> > + - Cb\ :sub:`10`
> > + - Cr\ :sub:`10`
> > + * - start + 24:
> > + - Cb\ :sub:`11`
> > + - Cr\ :sub:`11`
> > + - Cb\ :sub:`12`
> > + - Cr\ :sub:`12`
> > + * - start + 32:
> > + - Cb\ :sub:`13`
> > + - Cr\ :sub:`13`
> > + - Cb\ :sub:`14`
> > + - Cr\ :sub:`14`
> > +
> > +.. raw:: latex
> >
> > Fully Planar YUV Formats
> > ========================
> > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> > index 40f56e044640..be23e319fb3a 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 8e0a0ff62a70..1c80ad78ef00 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -1343,6 +1343,7 @@ 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/UV 4:2:0"; break;
> > case V4L2_PIX_FMT_NV21: descr = "Y/VU 4:2:0"; break;
> > + case V4L2_PIX_FMT_NV15: descr = "10-bit Y/UV 4:2:0 (Packed)"; break;
> > case V4L2_PIX_FMT_NV16: descr = "Y/UV 4:2:2"; break;
> > case V4L2_PIX_FMT_NV61: descr = "Y/VU 4:2:2"; break;
> > case V4L2_PIX_FMT_NV24: descr = "Y/UV 4:4:4"; break;
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 1befd181a4cc..e9731286dc77 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -621,6 +621,7 @@ 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
>