* Fwd: Re: [PATCH v2 2/2] media: Introduce helpers to fill pixel format structs
[not found] ` <4465a337-dd28-7fd9-dfdd-32592ec98193@collabora.com>
@ 2019-02-11 19:30 ` André Almeida
2019-02-11 19:35 ` Ezequiel Garcia
1 sibling, 0 replies; 4+ messages in thread
From: André Almeida @ 2019-02-11 19:30 UTC (permalink / raw)
To: linux-media
On 2/6/19 7:29 PM, Ezequiel Garcia wrote:
> Add two new API helpers, v4l2_fill_pixfmt and v4l2_fill_pixfmt_mp,
> to be used by drivers to calculate plane sizes and bytes per lines.
>
> Note that driver-specific padding and alignment are not
> taken into account, and must be done by drivers using this API.
>
> Signed-off-by: Ezequiel Garcia<ezequiel@collabora.com>
I've used the function v4l2_fill_pixfmt_mp in vimc to set multiplanar
formats in vidioc_s_fmt and worked correctly.
Tested-by: André Almeida<andre.almeida@collabora.com>
> ---
> This patch depends on "[PATCH 1/2] rockchip/vpu: Rename pixel format helpers"
> so avoid name collisions.
>
> Other than that, I've addressed all the feedback provided by Hans on v1,
> and tested with the MPEG-2 RK3399 decoder.
>
> drivers/media/v4l2-core/v4l2-common.c | 154 ++++++++++++++++++++++++++
> include/media/v4l2-common.h | 30 +++++
> 2 files changed, 184 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index 50763fb42a1b..93030d1bc87f 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -44,6 +44,7 @@
> * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
> */
>
> +#include <linux/ctype.h>
> #include <linux/module.h>
> #include <linux/types.h>
> #include <linux/kernel.h>
> @@ -455,3 +456,156 @@ int v4l2_s_parm_cap(struct video_device *vdev,
> return ret;
> }
> EXPORT_SYMBOL_GPL(v4l2_s_parm_cap);
> +
> +static char printable_char(int c)
> +{
> + return isascii(c) && isprint(c) ? c : '?';
> +}
> +
> +const char *v4l2_get_fourcc_name(uint32_t format)
> +{
> + static char buf[8];
> +
> + snprintf(buf, 8,
> + "%c%c%c%c%s",
> + printable_char(format & 0xff),
> + printable_char((format >> 8) & 0xff),
> + printable_char((format >> 16) & 0xff),
> + printable_char((format >> 24) & 0x7f),
> + (format & BIT(31)) ? "-BE" : "");
> +
> + return buf;
> +}
> +EXPORT_SYMBOL(v4l2_get_fourcc_name);
> +
> +const struct v4l2_format_info *v4l2_format_info(u32 format)
> +{
> + static const struct v4l2_format_info formats[] = {
> + /* RGB formats */
> + { .format = V4L2_PIX_FMT_BGR24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_RGB24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_HSV24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_BGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_XBGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_RGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_XRGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_HSV32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_ARGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_ABGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_GREY, .num_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> +
> + /* YUV formats */
> + { .format = V4L2_PIX_FMT_YUYV, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_YVYU, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_UYVY, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_VYUY, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> +
> + { .format = V4L2_PIX_FMT_NV12, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> + { .format = V4L2_PIX_FMT_NV21, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> + { .format = V4L2_PIX_FMT_NV16, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_NV61, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_NV24, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_NV42, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> +
> + { .format = V4L2_PIX_FMT_YUV410, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
> + { .format = V4L2_PIX_FMT_YVU410, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
> + { .format = V4L2_PIX_FMT_YUV411P, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 1 },
> + { .format = V4L2_PIX_FMT_YUV420, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
> + { .format = V4L2_PIX_FMT_YVU420, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
> + { .format = V4L2_PIX_FMT_YUV422P, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
> +
> + /* Non-contiguous, aka multiplanar formats */
> + { .format = V4L2_PIX_FMT_YUV420M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_YVU420M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_YUV422M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_YVU422M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_YUV444M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_YVU444M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1, .non_contiguous = 1 },
> +
> + { .format = V4L2_PIX_FMT_NV12M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_NV21M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_NV16M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> + { .format = V4L2_PIX_FMT_NV61M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> + };
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(formats); ++i)
> + if (formats[i].format == format)
> + return &formats[i];
> + return NULL;
> +}
> +EXPORT_SYMBOL(v4l2_format_info);
> +
> +int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt,
> + int pixelformat, int width, int height)
> +{
> + const struct v4l2_format_info *info;
> + struct v4l2_plane_pix_format *plane;
> + int i;
> +
> + info = v4l2_format_info(pixelformat);
> + if (!info)
> + return -EINVAL;
> +
> + pixfmt->width = width;
> + pixfmt->height = height;
> + pixfmt->pixelformat = pixelformat;
> +
> + if (!info->non_contiguous) {
> + pixfmt->num_planes = 1;
> + plane = &pixfmt->plane_fmt[0];
> + plane->bytesperline = width * info->bpp[0];
> + plane->sizeimage = 0;
> + for (i = 0; i < info->num_planes; i++) {
> + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> +
> + plane->sizeimage += info->bpp[i] *
> + DIV_ROUND_UP(width, hdiv) *
> + DIV_ROUND_UP(height, vdiv);
> + }
> + } else {
> + pixfmt->num_planes = info->num_planes;
> + for (i = 0; i < info->num_planes; i++) {
> + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> +
> + plane = &pixfmt->plane_fmt[i];
> + plane->bytesperline =
> + info->bpp[i] * DIV_ROUND_UP(width, hdiv);
> + plane->sizeimage =
> + plane->bytesperline * DIV_ROUND_UP(height, vdiv);
> + }
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt_mp);
> +
> +int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat, int width, int height)
> +{
> + const struct v4l2_format_info *info;
> + int i;
> +
> + info = v4l2_format_info(pixelformat);
> + if (!info)
> + return -EINVAL;
> + if (info->non_contiguous)
> + return -EINVAL;
> +
> + pixfmt->width = width;
> + pixfmt->height = height;
> + pixfmt->pixelformat = pixelformat;
> + pixfmt->bytesperline = width * info->bpp[0];
> + pixfmt->sizeimage = 0;
> +
> + for (i = 0; i < info->num_planes; i++) {
> + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> +
> + pixfmt->sizeimage += info->bpp[i] *
> + DIV_ROUND_UP(width, hdiv) *
> + DIV_ROUND_UP(height, vdiv);
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt);
> diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
> index 0c511ed8ffb0..977879dc2e76 100644
> --- a/include/media/v4l2-common.h
> +++ b/include/media/v4l2-common.h
> @@ -401,4 +401,34 @@ int v4l2_s_parm_cap(struct video_device *vdev,
> ((u64)(a).numerator * (b).denominator OP \
> (u64)(b).numerator * (a).denominator)
>
> +/* ------------------------------------------------------------------------- */
> +
> +/* Pixel format and FourCC helpers */
> +
> +/**
> + * struct v4l2_format_info - information about a V4L2 format
> + * @format: 4CC format identifier (V4L2_PIX_FMT_*)
> + * @num_planes: Number of planes, which includes the alpha plane (1 to 4).
> + * @bpp: Array of per-plane bytes per pixel
> + * @hdiv: Horizontal chroma subsampling factor
> + * @vdiv: Vertical chroma subsampling factor
> + * @non_contiguous: Is it a multiplane non-contiguous variant format? (e.g. NV12M)
> + */
> +struct v4l2_format_info {
> + u32 format;
> + u8 num_planes;
> + u8 bpp[4];
> + u8 hdiv;
> + u8 vdiv;
> + u8 non_contiguous;
> +};
> +
> +const struct v4l2_format_info *v4l2_format_info(u32 format);
> +const char *v4l2_get_fourcc_name(u32 format);
> +
> +int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat,
> + int width, int height);
> +int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, int pixelformat,
> + int width, int height);
> +
> #endif /* V4L2_COMMON_H_ */
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v2 2/2] media: Introduce helpers to fill pixel format structs
[not found] ` <4465a337-dd28-7fd9-dfdd-32592ec98193@collabora.com>
2019-02-11 19:30 ` Fwd: " André Almeida
@ 2019-02-11 19:35 ` Ezequiel Garcia
1 sibling, 0 replies; 4+ messages in thread
From: Ezequiel Garcia @ 2019-02-11 19:35 UTC (permalink / raw)
To: André Almeida, linux-media; +Cc: Hans Verkuil, kernel
Hello André,
On Mon, 2019-02-11 at 17:11 -0200, André Almeida wrote:
> On 2/6/19 7:29 PM, Ezequiel Garcia wrote:
> > Add two new API helpers, v4l2_fill_pixfmt and v4l2_fill_pixfmt_mp,
> > to be used by drivers to calculate plane sizes and bytes per lines.
> >
> > Note that driver-specific padding and alignment are not
> > taken into account, and must be done by drivers using this API.
> >
> > Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
>
> I've used the function v4l2_fill_pixfmt_mp in vimc to set multiplanar
> formats in vidioc_s_fmt and worked correctly.
>
> Tested-by: André Almeida<andre.almeida@collabora.com>
Thanks for the test!
For next time, please make sure you avoid HTML mails on mailing lists.
> > ---
> > This patch depends on "[PATCH 1/2] rockchip/vpu: Rename pixel format helpers"
> > so avoid name collisions.
> >
> > Other than that, I've addressed all the feedback provided by Hans on v1,
> > and tested with the MPEG-2 RK3399 decoder.
> >
> > drivers/media/v4l2-core/v4l2-common.c | 154 ++++++++++++++++++++++++++
> > include/media/v4l2-common.h | 30 +++++
> > 2 files changed, 184 insertions(+)
> >
> > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> > index 50763fb42a1b..93030d1bc87f 100644
> > --- a/drivers/media/v4l2-core/v4l2-common.c
> > +++ b/drivers/media/v4l2-core/v4l2-common.c
> > @@ -44,6 +44,7 @@
> > * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
> > */
> >
> > +#include <linux/ctype.h>
> > #include <linux/module.h>
> > #include <linux/types.h>
> > #include <linux/kernel.h>
> > @@ -455,3 +456,156 @@ int v4l2_s_parm_cap(struct video_device *vdev,
> > return ret;
> > }
> > EXPORT_SYMBOL_GPL(v4l2_s_parm_cap);
> > +
> > +static char printable_char(int c)
> > +{
> > + return isascii(c) && isprint(c) ? c : '?';
> > +}
> > +
> > +const char *v4l2_get_fourcc_name(uint32_t format)
> > +{
> > + static char buf[8];
> > +
> > + snprintf(buf, 8,
> > + "%c%c%c%c%s",
> > + printable_char(format & 0xff),
> > + printable_char((format >> 8) & 0xff),
> > + printable_char((format >> 16) & 0xff),
> > + printable_char((format >> 24) & 0x7f),
> > + (format & BIT(31)) ? "-BE" : "");
> > +
> > + return buf;
> > +}
> > +EXPORT_SYMBOL(v4l2_get_fourcc_name);
> > +
> > +const struct v4l2_format_info *v4l2_format_info(u32 format)
> > +{
> > + static const struct v4l2_format_info formats[] = {
> > + /* RGB formats */
> > + { .format = V4L2_PIX_FMT_BGR24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_RGB24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_HSV24, .num_planes = 1, .bpp = { 3, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_BGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_XBGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_RGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_XRGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_HSV32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_ARGB32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_ABGR32, .num_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_GREY, .num_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > +
> > + /* YUV formats */
> > + { .format = V4L2_PIX_FMT_YUYV, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_YVYU, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_UYVY, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_VYUY, .num_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > +
> > + { .format = V4L2_PIX_FMT_NV12, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > + { .format = V4L2_PIX_FMT_NV21, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> > + { .format = V4L2_PIX_FMT_NV16, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_NV61, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_NV24, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_NV42, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> > +
> > + { .format = V4L2_PIX_FMT_YUV410, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
> > + { .format = V4L2_PIX_FMT_YVU410, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
> > + { .format = V4L2_PIX_FMT_YUV411P, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 1 },
> > + { .format = V4L2_PIX_FMT_YUV420, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
> > + { .format = V4L2_PIX_FMT_YVU420, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
> > + { .format = V4L2_PIX_FMT_YUV422P, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
> > +
> > + /* Non-contiguous, aka multiplanar formats */
> > + { .format = V4L2_PIX_FMT_YUV420M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_YVU420M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_YUV422M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_YVU422M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_YUV444M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_YVU444M, .num_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1, .non_contiguous = 1 },
> > +
> > + { .format = V4L2_PIX_FMT_NV12M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_NV21M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_NV16M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> > + { .format = V4L2_PIX_FMT_NV61M, .num_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1, .non_contiguous = 1 },
> > + };
> > + unsigned int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(formats); ++i)
> > + if (formats[i].format == format)
> > + return &formats[i];
> > + return NULL;
> > +}
> > +EXPORT_SYMBOL(v4l2_format_info);
> > +
> > +int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt,
> > + int pixelformat, int width, int height)
> > +{
> > + const struct v4l2_format_info *info;
> > + struct v4l2_plane_pix_format *plane;
> > + int i;
> > +
> > + info = v4l2_format_info(pixelformat);
> > + if (!info)
> > + return -EINVAL;
> > +
> > + pixfmt->width = width;
> > + pixfmt->height = height;
> > + pixfmt->pixelformat = pixelformat;
> > +
> > + if (!info->non_contiguous) {
> > + pixfmt->num_planes = 1;
> > + plane = &pixfmt->plane_fmt[0];
> > + plane->bytesperline = width * info->bpp[0];
> > + plane->sizeimage = 0;
> > + for (i = 0; i < info->num_planes; i++) {
> > + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> > + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> > +
> > + plane->sizeimage += info->bpp[i] *
> > + DIV_ROUND_UP(width, hdiv) *
> > + DIV_ROUND_UP(height, vdiv);
> > + }
> > + } else {
> > + pixfmt->num_planes = info->num_planes;
> > + for (i = 0; i < info->num_planes; i++) {
> > + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> > + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> > +
> > + plane = &pixfmt->plane_fmt[i];
> > + plane->bytesperline =
> > + info->bpp[i] * DIV_ROUND_UP(width, hdiv);
> > + plane->sizeimage =
> > + plane->bytesperline * DIV_ROUND_UP(height, vdiv);
> > + }
> > + }
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt_mp);
> > +
> > +int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat, int width, int height)
> > +{
> > + const struct v4l2_format_info *info;
> > + int i;
> > +
> > + info = v4l2_format_info(pixelformat);
> > + if (!info)
> > + return -EINVAL;
> > + if (info->non_contiguous)
> > + return -EINVAL;
> > +
> > + pixfmt->width = width;
> > + pixfmt->height = height;
> > + pixfmt->pixelformat = pixelformat;
> > + pixfmt->bytesperline = width * info->bpp[0];
> > + pixfmt->sizeimage = 0;
> > +
> > + for (i = 0; i < info->num_planes; i++) {
> > + unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
> > + unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
> > +
> > + pixfmt->sizeimage += info->bpp[i] *
> > + DIV_ROUND_UP(width, hdiv) *
> > + DIV_ROUND_UP(height, vdiv);
> > + }
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt);
> > diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
> > index 0c511ed8ffb0..977879dc2e76 100644
> > --- a/include/media/v4l2-common.h
> > +++ b/include/media/v4l2-common.h
> > @@ -401,4 +401,34 @@ int v4l2_s_parm_cap(struct video_device *vdev,
> > ((u64)(a).numerator * (b).denominator OP \
> > (u64)(b).numerator * (a).denominator)
> >
> > +/* ------------------------------------------------------------------------- */
> > +
> > +/* Pixel format and FourCC helpers */
> > +
> > +/**
> > + * struct v4l2_format_info - information about a V4L2 format
> > + * @format: 4CC format identifier (V4L2_PIX_FMT_*)
> > + * @num_planes: Number of planes, which includes the alpha plane (1 to 4).
> > + * @bpp: Array of per-plane bytes per pixel
> > + * @hdiv: Horizontal chroma subsampling factor
> > + * @vdiv: Vertical chroma subsampling factor
> > + * @non_contiguous: Is it a multiplane non-contiguous variant format? (e.g. NV12M)
> > + */
> > +struct v4l2_format_info {
> > + u32 format;
> > + u8 num_planes;
> > + u8 bpp[4];
> > + u8 hdiv;
> > + u8 vdiv;
> > + u8 non_contiguous;
> > +};
> > +
> > +const struct v4l2_format_info *v4l2_format_info(u32 format);
> > +const char *v4l2_get_fourcc_name(u32 format);
> > +
> > +int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat,
> > + int width, int height);
> > +int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, int pixelformat,
> > + int width, int height);
> > +
> > #endif /* V4L2_COMMON_H_ */
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