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

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Message-Id: <20230324151228.2778112-5-paul.kocialkowski@bootlin.com>
Date:   Fri, 24 Mar 2023 16:12:23 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Adam Pigg <adam@...gz.co.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH 4/9] media: v4l2: Add JPEG pixel format to v4l2 format info

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@...tlin.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