media: add RealVideo format RV30 and RV40

RealVideo, or also spelled as Real Video, is a suite of proprietary
video compression formats developed by RealNetworks -
the specific format changes with the version.
RealVideo codecs are identified by four-character codes.
RV30 and RV40 are RealNetworks' proprietary H.264-based codecs.
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/userspace-api/media/v4l/pixfmt-compressed.rst

@@ -237,6 +237,26 @@ Compressed Formats
         Metadata associated with the frame to decode is required to be passed
         through the ``V4L2_CID_STATELESS_FWHT_PARAMS`` control.
 	See the :ref:`associated Codec Control ID <codec-stateless-fwht>`.
+    * .. _V4L2-PIX-FMT-RV30:
+
+      - ``V4L2_PIX_FMT_RV30``
+      - 'RV30'
+      - RealVideo, or also spelled as Real Video, is a suite of
+        proprietary video compression formats developed by
+        RealNetworks - the specific format changes with the version.
+        RealVideo codecs are identified by four-character codes.
+        RV30 corresponds to RealVideo 8, suspected to be based
+        largely on an early draft of H.264
+    * .. _V4L2-PIX-FMT-RV40:
+
+      - ``V4L2_PIX_FMT_RV40``
+      - 'RV40'
+      - RV40 represents RealVideo 9 and RealVideo 10.
+        RealVideo 9, suspected to be based on H.264.
+        RealVideo 10, aka RV9 EHQ, This refers to an improved encoder
+        for the RV9 format that is fully backwards compatible with
+        RV9 players - the format and decoder did not change, only
+        the encoder did. As a result, it uses the same FourCC.
 
 .. raw:: latex
 

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -1476,6 +1476,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 		case V4L2_PIX_FMT_FWHT:		descr = "FWHT"; break; /* used in vicodec */
 		case V4L2_PIX_FMT_FWHT_STATELESS:	descr = "FWHT Stateless"; break; /* used in vicodec */
 		case V4L2_PIX_FMT_SPK:		descr = "Sorenson Spark"; break;
+		case V4L2_PIX_FMT_RV30:		descr = "RealVideo 8"; break;
+		case V4L2_PIX_FMT_RV40:		descr = "RealVideo 9 & 10"; break;
 		case V4L2_PIX_FMT_CPIA1:	descr = "GSPCA CPiA YUV"; break;
 		case V4L2_PIX_FMT_WNVA:		descr = "WNVA"; break;
 		case V4L2_PIX_FMT_SN9C10X:	descr = "GSPCA SN9C10X"; break;

include/uapi/linux/videodev2.h

@@ -751,6 +751,8 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
 #define V4L2_PIX_FMT_HEVC_SLICE v4l2_fourcc('S', '2', '6', '5') /* HEVC parsed slices */
 #define V4L2_PIX_FMT_SPK      v4l2_fourcc('S', 'P', 'K', '0') /* Sorenson Spark */
+#define V4L2_PIX_FMT_RV30     v4l2_fourcc('R', 'V', '3', '0') /* RealVideo 8 */
+#define V4L2_PIX_FMT_RV40     v4l2_fourcc('R', 'V', '4', '0') /* RealVideo 9 & 10 */
 
 /*  Vendor-specific formats   */
 #define V4L2_PIX_FMT_CPIA1    v4l2_fourcc('C', 'P', 'I', 'A') /* cpia1 YUV */