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authorMirela Rabulea <mirela.rabulea@nxp.com>2021-03-11 01:28:49 +0100
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2021-03-22 10:35:36 +0100
commitb8035f7988a82cbbabf1009b9f3234ff2431f8a4 (patch)
tree12c697ac478db28d673d4d98fdbd08790ca49d8b /include/media/v4l2-jpeg.h
parentb16ed1e660085dc9e6c8425e9c584055484f4665 (diff)
media: Add parsing for APP14 data segment in jpeg helpers
According to Rec. ITU-T T.872 (06/2012) 6.5.3 APP14 segment is for color encoding, it contains a transform flag, which may have values of 0, 1 and 2 and are interpreted as follows: 0 - CMYK for images that are encoded with four components - RGB for images that are encoded with three components 1 - An image encoded with three components using YCbCr colour encoding. 2 - An image encoded with four components using YCCK colour encoding. This is used in imx-jpeg decoder, to distinguish between YUV444 and RGB24. Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include/media/v4l2-jpeg.h')
-rw-r--r--include/media/v4l2-jpeg.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/media/v4l2-jpeg.h b/include/media/v4l2-jpeg.h
index 3a3344a97678..2dba843ce3bd 100644
--- a/include/media/v4l2-jpeg.h
+++ b/include/media/v4l2-jpeg.h
@@ -88,6 +88,24 @@ struct v4l2_jpeg_scan_header {
};
/**
+ * enum v4l2_jpeg_app14_tf - APP14 transform flag
+ * According to Rec. ITU-T T.872 (06/2012) 6.5.3
+ * APP14 segment is for color encoding, it contains a transform flag,
+ * which may have values of 0, 1 and 2 and are interpreted as follows:
+ * @V4L2_JPEG_APP14_TF_CMYK_RGB: CMYK for images encoded with four components
+ * RGB for images encoded with three components
+ * @V4L2_JPEG_APP14_TF_YCBCR: an image encoded with three components using YCbCr
+ * @V4L2_JPEG_APP14_TF_YCCK: an image encoded with four components using YCCK
+ * @V4L2_JPEG_APP14_TF_UNKNOWN: indicate app14 is not present
+ */
+enum v4l2_jpeg_app14_tf {
+ V4L2_JPEG_APP14_TF_CMYK_RGB = 0,
+ V4L2_JPEG_APP14_TF_YCBCR = 1,
+ V4L2_JPEG_APP14_TF_YCCK = 2,
+ V4L2_JPEG_APP14_TF_UNKNOWN = -1,
+};
+
+/**
* struct v4l2_jpeg_header - parsed JPEG header
* @sof: pointer to frame header and size
* @sos: pointer to scan header and size
@@ -102,6 +120,7 @@ struct v4l2_jpeg_scan_header {
* order, optional
* @restart_interval: number of MCU per restart interval, Ri
* @ecs_offset: buffer offset in bytes to the entropy coded segment
+ * @app14_tf: transform flag from app14 data
*
* When this structure is passed to v4l2_jpeg_parse_header, the optional scan,
* quantization_tables, and huffman_tables pointers must be initialized to NULL
@@ -121,6 +140,7 @@ struct v4l2_jpeg_header {
struct v4l2_jpeg_reference *huffman_tables;
u16 restart_interval;
size_t ecs_offset;
+ enum v4l2_jpeg_app14_tf app14_tf;
};
int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out);