The format is used on the R-Car VSP1 video queues that carry
1-D histogram statistics data.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
.../DocBook/media/v4l/pixfmt-meta-vsp1-hgo.xml | 307 +++++++++++++++++++++
Documentation/DocBook/media/v4l/pixfmt.xml | 9 +
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
include/uapi/linux/videodev2.h | 3 +
4 files changed, 320 insertions(+)
create mode 100644 Documentation/DocBook/media/v4l/pixfmt-meta-vsp1-hgo.xml
diff --git a/Documentation/DocBook/media/v4l/pixfmt-meta-vsp1-hgo.xml b/Documentation/DocBook/media/v4l/pixfmt-meta-vsp1-hgo.xml
new file mode 100644
index 000000000000..b40bd10695d2
--- /dev/null
+++ b/Documentation/DocBook/media/v4l/pixfmt-meta-vsp1-hgo.xml
@@ -0,0 +1,307 @@
+<refentry id="V4L2-META-FMT-VSP1-HGO">
+ <refmeta>
+ <refentrytitle>V4L2_META_FMT_VSP1_HGO ('VSPH')</refentrytitle>
+ &manvol;
+ </refmeta>
+ <refnamediv>
+ <refname>
+ <constant>V4L2_META_FMT_VSP1_HGO</constant>
+ </refname>
+ <refpurpose>Renesas R-Car VSP1 1-D Histogram Data</refpurpose>
+ </refnamediv>
+ <refsect1>
+ <title>Description</title>
+ <para>
+This format describes histogram data generated by the Renesas R-Car VSP1 1-D
+Histogram (HGO) engine.
+ </para>
+ <para>
+The VSP1 HGO is a histogram computation engine that can operate on RGB, YCrCb
+or HSV data. It operates on a possibly cropped and subsampled input image and
+computes the minimum, maximum and sum of all pixels as well as per-channel
+histograms.
+ </para>
+The HGO can compute histograms independently per channel, on the maximum of the
+three channels (RGB data only) or on the Y channel only (YCbCr only). It can
+additionally output the histogram with 64 or 256 bins, resulting in four
+possible modes of operation.
+ <itemizedlist>
+ <listitem>
+ <para>
+ In <emphasis>64 bins normal mode</emphasis>, the HGO operates
+ on the three channels independently to compute three 64-bins
+ histograms. RGB, YCbCr and HSV image formats are supported.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ In <emphasis>64 bins maximum mode</emphasis>, the HGO operates
+ on the maximum of the (R, G, B) channels to compute a single
+ 64-bins histogram. Only the RGB image format is supported.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ In <emphasis>256 bins normal mode</emphasis>, the HGO operates
+ on the Y channel to compute a single 256-bins histogram. Only the
+ YCbCr image format is supported.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ In <emphasis>256 bins maximum mode</emphasis>, the HGO operates
+ on the maximum of the (R, G, B) channels to compute a single
+ 256-bins histogram. Only the RGB image format is supported.
+ </para>
+ </listitem>
+ </itemizedlist>
+ <para>
+ </para>
+ <para>
+All data is stored in memory in little endian format. Each cell in the tables
+below contains one byte.
+ </para>
+ <table frame="none">
+ <title>VSP1 HGO Data - 64 Bins, Normal Mode (792 bytes)</title>
+ <tgroup cols="5">
+ <colspec colnum="1" colname="offset" align="left" />
+ <colspec colnum="2" colname="b3" align="center" />
+ <colspec colnum="3" colname="b2" align="center" />
+ <colspec colnum="4" colname="b1" align="center" />
+ <colspec colnum="5" colname="b0" align="center" />
+ <spanspec namest="b3" nameend="b0" spanname="word" colsep="1" align="center" />
+ <thead>
+ <row>
+ <entry>Offset</entry>
+ <entry spanname="word">Memory</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry>[31:24]</entry>
+ <entry>[23:16]</entry>
+ <entry>[15:8]</entry>
+ <entry>[7:0]</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry>0</entry>
+ <entry>-</entry>
+ <entry>R/Cr/H max [7:0]</entry>
+ <entry>-</entry>
+ <entry>R/Cr/H min [7:0]</entry>
+ </row>
+ <row>
+ <entry>4</entry>
+ <entry>-</entry>
+ <entry>G/Y/S max [7:0]</entry>
+ <entry>-</entry>
+ <entry>G/Y/S min [7:0]</entry>
+ </row>
+ <row>
+ <entry>8</entry>
+ <entry>-</entry>
+ <entry>B/Cb/V max [7:0]</entry>
+ <entry>-</entry>
+ <entry>B/Cb/V min [7:0]</entry>
+ </row>
+ <row>
+ <entry>12</entry>
+ <entry spanname="word">R/Cr/H sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>16</entry>
+ <entry spanname="word">G/Y/S sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>20</entry>
+ <entry spanname="word">B/Cb/V sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>24</entry>
+ <entry spanname="word">R/Cr/H bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>276</entry>
+ <entry spanname="word">R/Cr/H bin 63 [31:0]</entry>
+ </row>
+ <row>
+ <entry>280</entry>
+ <entry spanname="word">G/Y/S bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>532</entry>
+ <entry spanname="word">G/Y/S bin 63 [31:0]</entry>
+ </row>
+ <row>
+ <entry>536</entry>
+ <entry spanname="word">B/Cb/V bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>788</entry>
+ <entry spanname="word">B/Cb/V bin 63 [31:0]</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <table frame="none">
+ <title>VSP1 HGO Data - 64 Bins, Max Mode (264 bytes)</title>
+ <tgroup cols="5">
+ <colspec colnum="1" colname="offset" align="left" />
+ <colspec colnum="2" colname="b3" align="center" />
+ <colspec colnum="3" colname="b2" align="center" />
+ <colspec colnum="4" colname="b1" align="center" />
+ <colspec colnum="5" colname="b0" align="center" />
+ <spanspec namest="b3" nameend="b0" spanname="word" colsep="1" align="center" />
+ <thead>
+ <row>
+ <entry>Offset</entry>
+ <entry spanname="word">Memory</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry>[31:24]</entry>
+ <entry>[23:16]</entry>
+ <entry>[15:8]</entry>
+ <entry>[7:0]</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry>0</entry>
+ <entry>-</entry>
+ <entry>max(R,G,B) max [7:0]</entry>
+ <entry>-</entry>
+ <entry>max(R,G,B) min [7:0]</entry>
+ </row>
+ <row>
+ <entry>4</entry>
+ <entry spanname="word">max(R,G,B) sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>8</entry>
+ <entry spanname="word">max(R,G,B) bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>260</entry>
+ <entry spanname="word">max(R,G,B) bin 63 [31:0]</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <table frame="none">
+ <title>VSP1 HGO Data - 256 Bins, Normal Mode (1032 bytes)</title>
+ <tgroup cols="5">
+ <colspec colnum="1" colname="offset" align="left" />
+ <colspec colnum="2" colname="b3" align="center" />
+ <colspec colnum="3" colname="b2" align="center" />
+ <colspec colnum="4" colname="b1" align="center" />
+ <colspec colnum="5" colname="b0" align="center" />
+ <spanspec namest="b3" nameend="b0" spanname="word" colsep="1" align="center" />
+ <thead>
+ <row>
+ <entry>Offset</entry>
+ <entry spanname="word">Memory</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry>[31:24]</entry>
+ <entry>[23:16]</entry>
+ <entry>[15:8]</entry>
+ <entry>[7:0]</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry>0</entry>
+ <entry>-</entry>
+ <entry>Y max [7:0]</entry>
+ <entry>-</entry>
+ <entry>Y min [7:0]</entry>
+ </row>
+ <row>
+ <entry>4</entry>
+ <entry spanname="word">Y sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>8</entry>
+ <entry spanname="word">Y bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>1028</entry>
+ <entry spanname="word">Y bin 255 [31:0]</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <table frame="none">
+ <title>VSP1 HGO Data - 256 Bins, Max Mode (1032 bytes)</title>
+ <tgroup cols="5">
+ <colspec colnum="1" colname="offset" align="left" />
+ <colspec colnum="2" colname="b3" align="center" />
+ <colspec colnum="3" colname="b2" align="center" />
+ <colspec colnum="4" colname="b1" align="center" />
+ <colspec colnum="5" colname="b0" align="center" />
+ <spanspec namest="b3" nameend="b0" spanname="word" colsep="1" align="center" />
+ <thead>
+ <row>
+ <entry>Offset</entry>
+ <entry spanname="word">Memory</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry>[31:24]</entry>
+ <entry>[23:16]</entry>
+ <entry>[15:8]</entry>
+ <entry>[7:0]</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry>0</entry>
+ <entry>-</entry>
+ <entry>max(R,G,B) max [7:0]</entry>
+ <entry>-</entry>
+ <entry>max(R,G,B) min [7:0]</entry>
+ </row>
+ <row>
+ <entry>4</entry>
+ <entry spanname="word">max(R,G,B) sum [31:0]</entry>
+ </row>
+ <row>
+ <entry>8</entry>
+ <entry spanname="word">max(R,G,B) bin 0 [31:0]</entry>
+ </row>
+ <row>
+ <entry></entry>
+ <entry spanname="word">...</entry>
+ </row>
+ <row>
+ <entry>1028</entry>
+ <entry spanname="word">max(R,G,B) bin 255 [31:0]</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ </refsect1>
+</refentry>
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
index 5a08aeea4360..b001e7c29859 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -1740,6 +1740,15 @@ extended control <constant>V4L2_CID_MPEG_STREAM_TYPE</constant>, see
</table>
</section>
+ <section id="meta-formats">
+ <title>Meta-data Formats</title>
+
+ <para>These formats are used for meta-data.</para>
+
+ &sub-meta-vsp1-hgo;
+
+ </section>
+
<section id="sdr-formats">
<title>SDR Formats</title>
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 1a3f7ca546de..f833fcfd6277 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1259,6 +1259,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_SDR_FMT_CS8: descr = "Complex S8"; break;
case V4L2_SDR_FMT_CS14LE: descr = "Complex S14LE"; break;
case V4L2_SDR_FMT_RU12LE: descr = "Real U12LE"; break;
+ case V4L2_META_FMT_VSP1_HGO: descr = "R-Car VSP1 1-D Histogram"; break;
default:
/* Compressed formats */
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 5035295a0138..154b645a43b1 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -638,6 +638,9 @@ struct v4l2_pix_format {
#define V4L2_SDR_FMT_CS14LE v4l2_fourcc('C', 'S', '1', '4') /* complex s14le */
#define V4L2_SDR_FMT_RU12LE v4l2_fourcc('R', 'U', '1', '2') /* real u12le */
+/* Meta-data formats */
+#define V4L2_META_FMT_VSP1_HGO v4l2_fourcc('V', 'S', 'P', 'H') /* R-Car VSP1 Histogram */
+
/* priv field value to indicates that subsequent fields are valid. */
#define V4L2_PIX_FMT_PRIV_MAGIC 0xfeedcafe
--
2.7.3
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
