[PATCH 4/9] media: v4l2: Add JPEG pixel format to v4l2 format info

Paul Kocialkowski
2023-03-24T15:12:48Z

Represent the JPEG pixel format in the v4l2 format info table.

Note that the bpp is set to 1 which is not a proper way to estimate
the needed buffer size for a given JPEG image. However the compression
ratios of JPEG typically allow fitting the image in a smaller size,
even though extra metadata could increase the total size by an
arbitrary amount. Thus it is not a perfectly safe way to calculate the
size of a JPEG buffer for given dimensions but it still provides a
reasonable approach.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
drivers/media/v4l2-core/v4l2-common.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 5101989716aa..8b2f201a8918 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -317,6 +317,9 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
{ .format = V4L2_PIX_FMT_SGBRG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_SGRBG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
{ .format = V4L2_PIX_FMT_SRGGB12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
+
+ /* Compressed formats */
+ { .format = V4L2_PIX_FMT_JPEG, .pixel_enc = V4L2_PIXEL_ENC_COMPRESSED, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
};
unsigned int i;

--
2.39.2