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SubjectRe: [RFC PATCH 18/20] lib: image-formats: Add v4l2 formats support
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Le mardi 19 mars 2019 à 22:57 +0100, Maxime Ripard a écrit :
> V4L2 uses different fourcc's than DRM, and has a different set of formats.
> For now, let's add the v4l2 fourcc's for the already existing formats.

Hopefully I get the fixup right this time, see inline.

>
> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
> ---
> include/linux/image-formats.h | 9 +++++-
> lib/image-formats.c | 67 ++++++++++++++++++++++++++++++++++++-
> 2 files changed, 76 insertions(+)
>
> diff --git a/include/linux/image-formats.h b/include/linux/image-formats.h
> index 53fd73a71b3d..fbc3a4501ebd 100644
> --- a/include/linux/image-formats.h
> +++ b/include/linux/image-formats.h
> @@ -26,6 +26,13 @@ struct image_format_info {
> };
>
> /**
> + * @v4l2_fmt:
> + *
> + * V4L2 4CC format identifier (V4L2_PIX_FMT_*)
> + */
> + u32 v4l2_fmt;
> +
> + /**
> * @depth:
> *
> * Color depth (number of bits per pixel excluding padding bits),
> @@ -222,6 +229,8 @@ image_format_info_is_yuv_sampling_444(const struct image_format_info *info)
>
> const struct image_format_info *__image_format_drm_lookup(u32 drm);
> const struct image_format_info *image_format_drm_lookup(u32 drm);
> +const struct image_format_info *__image_format_v4l2_lookup(u32 v4l2);
> +const struct image_format_info *image_format_v4l2_lookup(u32 v4l2);
> unsigned int image_format_plane_cpp(const struct image_format_info *format,
> int plane);
> unsigned int image_format_plane_width(int width,
> diff --git a/lib/image-formats.c b/lib/image-formats.c
> index 9b9a73220c5d..39f1d38ae861 100644
> --- a/lib/image-formats.c
> +++ b/lib/image-formats.c
> @@ -8,6 +8,7 @@
> static const struct image_format_info formats[] = {
> {
> .drm_fmt = DRM_FORMAT_C8,
> + .v4l2_fmt = V4L2_PIX_FMT_GREY,
> .depth = 8,
> .num_planes = 1,
> .cpp = { 1, 0, 0 },
> @@ -15,6 +16,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_RGB332,
> + .v4l2_fmt = V4L2_PIX_FMT_RGB332,
> .depth = 8,
> .num_planes = 1,
> .cpp = { 1, 0, 0 },
> @@ -29,6 +31,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_XRGB4444,
> + .v4l2_fmt = V4L2_PIX_FMT_XRGB444,

Not completely sure, looks like in the V4L2 variant, the padding is on
the 4 MSB of the second byte, which makes it incompatible. There is no
other equivalent.

> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -57,6 +60,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_ARGB4444,
> + .v4l2_fmt = V4L2_PIX_FMT_ARGB444,

Similarly.

> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -89,6 +93,7 @@ static const struct image_format_info formats[] = {
> .has_alpha = true,
> }, {
> .drm_fmt = DRM_FORMAT_XRGB1555,
> + .v4l2_fmt = V4L2_PIX_FMT_XRGB555,

Same swapping, can't find a match.

> .depth = 15,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -117,6 +122,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_ARGB1555,
> + .v4l2_fmt = V4L2_PIX_FMT_ARGB555,

Same.

> .depth = 15,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -149,6 +155,7 @@ static const struct image_format_info formats[] = {
> .has_alpha = true,
> }, {
> .drm_fmt = DRM_FORMAT_RGB565,
> + .v4l2_fmt = V4L2_PIX_FMT_RGB565,

-> V4L2_PIX_FMT_RGB565X

Was added later, as what you expect is not compatible.

> .depth = 16,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -163,6 +170,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_RGB888,
> + .v4l2_fmt = V4L2_PIX_FMT_RGB24,

-> V4L2_PIX_FMT_BGR24

> .depth = 24,
> .num_planes = 1,
> .cpp = { 3, 0, 0 },
> @@ -170,6 +178,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_BGR888,
> + .v4l2_fmt = V4L2_PIX_FMT_BGR24,

-> V4L2_PIX_FMT_RGB24

> .depth = 24,
> .num_planes = 1,
> .cpp = { 3, 0, 0 },
> @@ -177,6 +186,7 @@ static const struct image_format_info formats[] = {
> .vsub = 1,
> }, {
> .drm_fmt = DRM_FORMAT_XRGB8888,
> + .v4l2_fmt = V4L2_PIX_FMT_XRGB32,

-> V4L2_PIX_FMT_XBGR32

> .depth = 24,
> .num_planes = 1,
> .cpp = { 4, 0, 0 },
> @@ -281,6 +291,7 @@ static const struct image_format_info formats[] = {
> .has_alpha = true,
> }, {
> .drm_fmt = DRM_FORMAT_ARGB8888,
> + .v4l2_fmt = V4L2_PIX_FMT_ARGB32,

-> V4L2_PIX_FMT_ABGR32

> .depth = 32,
> .num_planes = 1,
> .cpp = { 4, 0, 0 },
> @@ -361,6 +372,7 @@ static const struct image_format_info formats[] = {
> .has_alpha = true,
> }, {
> .drm_fmt = DRM_FORMAT_YUV410,
> + .v4l2_fmt = V4L2_PIX_FMT_YUV410,
> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -369,6 +381,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YVU410,
> + .v4l2_fmt = V4L2_PIX_FMT_YVU410,
> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -393,6 +406,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YUV420,
> + .v4l2_fmt = V4L2_PIX_FMT_YUV420M,

There is two valid matches in V4L2 for this format, not sure how this
will be handled. The M variant is to be used with MPLANE v4l2_buffer
when num_planes is bigger then 1.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -401,6 +415,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YVU420,
> + .v4l2_fmt = V4L2_PIX_FMT_YVU420M,

Same.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -409,6 +424,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YUV422,
> + .v4l2_fmt = V4L2_PIX_FMT_YUV422M,

Same.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -417,6 +433,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YVU422,
> + .v4l2_fmt = V4L2_PIX_FMT_YVU422M,

Same.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -425,6 +442,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YUV444,
> + .v4l2_fmt = V4L2_PIX_FMT_YUV444M,

Same.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -433,6 +451,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YVU444,
> + .v4l2_fmt = V4L2_PIX_FMT_YVU444M,

Same.

> .depth = 0,
> .num_planes = 3,
> .cpp = { 1, 1, 1 },
> @@ -441,6 +460,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV12,
> + .v4l2_fmt = V4L2_PIX_FMT_NV12,

V4L2_PIX_FMT_NV12M is the mplane variant. Depending on how you handle,
which should be concistant picking one up.

> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -449,6 +469,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV21,
> + .v4l2_fmt = V4L2_PIX_FMT_NV21,

Same, NV12M for mplane.

> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -457,6 +478,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV16,
> + .v4l2_fmt = V4L2_PIX_FMT_NV16,

Same, NV16M.

> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -465,6 +487,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV61,
> + .v4l2_fmt = V4L2_PIX_FMT_NV61,

Same, NV61M.

> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -473,6 +496,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV24,
> + .v4l2_fmt = V4L2_PIX_FMT_NV24,

For extra fun, the M variant has not been added yet.

> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -481,6 +505,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_NV42,
> + .v4l2_fmt = V4L2_PIX_FMT_NV42,
> .depth = 0,
> .num_planes = 2,
> .cpp = { 1, 2, 0 },
> @@ -489,6 +514,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YUYV,
> + .v4l2_fmt = V4L2_PIX_FMT_YUYV,
> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -497,6 +523,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_YVYU,
> + .v4l2_fmt = V4L2_PIX_FMT_YVYU,
> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -505,6 +532,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_UYVY,
> + .v4l2_fmt = V4L2_PIX_FMT_UYVY,
> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -513,6 +541,7 @@ static const struct image_format_info formats[] = {
> .is_yuv = true,
> }, {
> .drm_fmt = DRM_FORMAT_VYUY,
> + .v4l2_fmt = V4L2_PIX_FMT_VYUY,
> .depth = 0,
> .num_planes = 1,
> .cpp = { 2, 0, 0 },
> @@ -632,6 +661,44 @@ const struct image_format_info *image_format_drm_lookup(u32 drm)
> EXPORT_SYMBOL(image_format_drm_lookup);
>
> /**
> + * __image_format_v4l2_lookup - query information for a given format
> + * @v4l2: V4L2 fourcc pixel format (V4L2_PIX_FMT_*)
> + *
> + * The caller should only pass a supported pixel format to this function.
> + *
> + * Returns:
> + * The instance of struct image_format_info that describes the pixel format, or
> + * NULL if the format is unsupported.
> + */
> +const struct image_format_info *__image_format_v4l2_lookup(u32 v4l2)
> +{
> + return __image_format_lookup(v4l2_fmt, v4l2);
> +}
> +EXPORT_SYMBOL(__image_format_v4l2_lookup);
> +
> +/**
> + * image_format_v4l2_lookup - query information for a given format
> + * @v4l2: V4L2 fourcc pixel format (V4L2_PIX_FMT_*)
> + *
> + * The caller should only pass a supported pixel format to this function.
> + * Unsupported pixel formats will generate a warning in the kernel log.
> + *
> + * Returns:
> + * The instance of struct image_format_info that describes the pixel format, or
> + * NULL if the format is unsupported.
> + */
> +const struct image_format_info *image_format_v4l2_lookup(u32 v4l2)
> +{
> + const struct image_format_info *format;
> +
> + format = __image_format_v4l2_lookup(v4l2);
> +
> + WARN_ON(!format);
> + return format;
> +}
> +EXPORT_SYMBOL(image_format_v4l2_lookup);
> +
> +/**
> * image_format_plane_cpp - determine the bytes per pixel value
> * @format: pointer to the image_format
> * @plane: plane index
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