From: "Mirela Rabulea (OSS)" <mirela.rabulea@oss.nxp.com>
To: mchehab@kernel.org, hverkuil-cisco@xs4all.nl,
shawnguo@kernel.org, robh+dt@kernel.org
Cc: paul.kocialkowski@bootlin.com, linux-media@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-imx@nxp.com,
s.hauer@pengutronix.de, aisheng.dong@nxp.com,
daniel.baluta@nxp.com, robert.chiras@nxp.com,
laurentiu.palcu@nxp.com, mark.rutland@arm.com,
devicetree@vger.kernel.org, p.zabel@pengutronix.de,
ezequiel@collabora.com,
laurent.pinchart+renesas@ideasonboard.com,
niklas.soderlund+renesas@ragnatech.se,
dafna.hirschfeld@collabora.com,
Mirela Rabulea <mirela.rabulea@nxp.com>
Subject: [PATCH v4 08/11] media: Add parsing for APP14 data segment in jpeg helpers
Date: Mon, 2 Nov 2020 05:08:18 +0200 [thread overview]
Message-ID: <20201102030821.3049-9-mirela.rabulea@oss.nxp.com> (raw)
In-Reply-To: <20201102030821.3049-1-mirela.rabulea@oss.nxp.com>
From: Mirela Rabulea <mirela.rabulea@nxp.com>
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>
---
drivers/media/v4l2-core/v4l2-jpeg.c | 39 +++++++++++++++++++++++++++--
include/media/v4l2-jpeg.h | 16 ++++++++++--
2 files changed, 51 insertions(+), 4 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c
index 8947fd95c6f1..a8198f98c158 100644
--- a/drivers/media/v4l2-core/v4l2-jpeg.c
+++ b/drivers/media/v4l2-core/v4l2-jpeg.c
@@ -45,6 +45,7 @@ MODULE_LICENSE("GPL");
#define DHP 0xffde /* hierarchical progression */
#define EXP 0xffdf /* expand reference */
#define APP0 0xffe0 /* application data */
+#define APP14 0xffee /* application data for colour encoding */
#define APP15 0xffef
#define JPG0 0xfff0 /* extensions */
#define JPG13 0xfffd
@@ -444,8 +445,35 @@ static int jpeg_skip_segment(struct jpeg_stream *stream)
return jpeg_skip(stream, len - 2);
}
+/* Rec. ITU-T T.872 (06/2012) 6.5.3 */
+static int jpeg_parse_app14_data(struct jpeg_stream *stream,
+ struct v4l2_jpeg_app14_data *app14)
+{
+ int Lp;
+ int skip;
+ int tf;
+
+ if (!app14)
+ return 0; /* do not parse */
+
+ Lp = jpeg_get_word_be(stream);
+ if (Lp < 0)
+ return Lp;
+ app14->len = Lp;
+
+ /* get to Ap12 */
+ jpeg_skip(stream, 11);
+ tf = jpeg_get_byte(stream);
+ if (tf < 0)
+ return tf;
+ app14->transform_flag = tf;
+
+ skip = Lp - 2 - 11;
+ return jpeg_skip(stream, skip);
+}
+
/**
- * jpeg_parse_header - locate marker segments and optionally parse headers
+ * v4l2_jpeg_parse_header - locate marker segments and optionally parse headers
* @buf: address of the JPEG buffer, should start with a SOI marker
* @len: length of the JPEG buffer
* @out: returns marker segment positions and optionally parsed headers
@@ -476,6 +504,10 @@ int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out)
if (marker != SOI)
return -EINVAL;
+ /* init value to signal if this marker is not present */
+ if (out->app14)
+ out->app14->len = -1;
+
/* loop through marker segments */
while ((marker = jpeg_next_marker(&stream)) >= 0) {
switch (marker) {
@@ -519,7 +551,10 @@ int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out)
ret = jpeg_parse_restart_interval(&stream,
&out->restart_interval);
break;
-
+ case APP14:
+ ret = jpeg_parse_app14_data(&stream,
+ out->app14);
+ break;
case SOS:
ret = jpeg_reference_segment(&stream, &out->sos);
if (ret < 0)
diff --git a/include/media/v4l2-jpeg.h b/include/media/v4l2-jpeg.h
index ddba2a56c321..2b02d89f20b4 100644
--- a/include/media/v4l2-jpeg.h
+++ b/include/media/v4l2-jpeg.h
@@ -87,6 +87,16 @@ struct v4l2_jpeg_scan_header {
/* Ss, Se, Ah, and Al are not used by any driver */
};
+/**
+ * struct v4l2_jpeg_app14_data - APP14 data segment
+ * @len: Lp application data segment length, becomes -1 if APP14 is not present
+ * @transform_flag: Ap12 byte for color encoding
+ */
+struct v4l2_jpeg_app14_data {
+ u16 len;
+ u8 transform_flag;
+};
+
/**
* struct v4l2_jpeg_header - parsed JPEG header
* @sof: pointer to frame header and size
@@ -98,12 +108,13 @@ struct v4l2_jpeg_scan_header {
* @quantization_tables: references to four quantization tables, optional
* @huffman_tables: references to four Huffman tables in DC0, DC1, AC0, AC1
* order, optional
+ * @app14: pointer to app14 data, optional
* @restart_interval: number of MCU per restart interval, Ri
* @ecs_offset: buffer offset in bytes to the entropy coded segment
*
* When this structure is passed to v4l2_jpeg_parse_header, the optional scan,
- * quantization_tables, and huffman_tables pointers must be initialized to NULL
- * or point at valid memory.
+ * quantization_tables, huffman_tables and app14 pointers must be initialized
+ * to NULL or point at valid memory.
*/
struct v4l2_jpeg_header {
struct v4l2_jpeg_reference sof;
@@ -117,6 +128,7 @@ struct v4l2_jpeg_header {
struct v4l2_jpeg_scan_header *scan;
struct v4l2_jpeg_reference *quantization_tables;
struct v4l2_jpeg_reference *huffman_tables;
+ struct v4l2_jpeg_app14_data *app14;
u16 restart_interval;
size_t ecs_offset;
};
--
2.17.1
next prev parent reply other threads:[~2020-11-02 3:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 3:08 [PATCH v4 00/11] Add V4L2 driver for i.MX8 JPEG Encoder/Decoder Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 01/11] media: v4l: Add packed YUV444 24bpp pixel format Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 02/11] firmware: imx: scu-pd: Add power domains for imx-jpeg Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 03/11] media: dt-bindings: Add bindings for i.MX8QXP/QM JPEG driver Mirela Rabulea (OSS)
2020-11-04 22:38 ` Rob Herring
2020-11-09 21:59 ` [EXT] " Mirela Rabulea
2020-11-02 3:08 ` [PATCH v4 04/11] media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder Mirela Rabulea (OSS)
2020-11-02 16:20 ` Laurentiu Palcu
2020-11-06 1:05 ` Mirela Rabulea
2020-11-04 16:03 ` kernel test robot
2020-11-02 3:08 ` [PATCH v4 05/11] arm64: dts: imx8qxp: Add jpeg encoder/decoder nodes Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 06/11] Add maintainer for IMX jpeg v4l2 driver Mirela Rabulea (OSS)
2020-11-02 16:25 ` Laurentiu Palcu
2020-11-02 3:08 ` [PATCH v4 07/11] media: imx-jpeg: Fix v4l2-compliance streaming tests on decoder Mirela Rabulea (OSS)
2020-11-02 3:08 ` Mirela Rabulea (OSS) [this message]
2020-11-02 3:08 ` [PATCH v4 09/11] media: Quit parsing stream if doesn't start with SOI Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 10/11] media: Avoid parsing quantization and huffman tables Mirela Rabulea (OSS)
2020-11-02 3:08 ` [PATCH v4 11/11] media: imx-jpeg: Use v4l2 jpeg helpers in mxc-jpeg Mirela Rabulea (OSS)
2020-11-04 11:52 ` [PATCH v4 00/11] Add V4L2 driver for i.MX8 JPEG Encoder/Decoder Hans Verkuil
2020-11-04 11:55 ` Hans Verkuil
2020-11-04 13:27 ` [EXT] " Mirela Rabulea
2020-11-04 14:08 ` Hans Verkuil
2020-11-06 1:04 ` Mirela Rabulea
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