media: videodev2.h: add V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL flag

Add the V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL flag to signal that
the coded frame interval can be set separately from the raw frame
interval for stateful encoders.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Michael Tretter <m.tretter@pengutronix.de>
Acked-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst

@@ -167,17 +167,37 @@ the ``mbus_code`` field is handled differently:
       - The hardware decoder for this compressed bytestream format (aka coded
 	format) is capable of parsing a continuous bytestream. Applications do
 	not need to parse the bytestream themselves to find the boundaries
-	between frames/fields. This flag can only be used in combination with
-	the ``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to compressed
+	between frames/fields.
+
+	This flag can only be used in combination with the
+	``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to compressed
 	formats only. This flag is valid for stateful decoders only.
     * - ``V4L2_FMT_FLAG_DYN_RESOLUTION``
       - 0x0008
       - Dynamic resolution switching is supported by the device for this
 	compressed bytestream format (aka coded format). It will notify the user
 	via the event ``V4L2_EVENT_SOURCE_CHANGE`` when changes in the video
-	parameters are detected. This flag can only be used in combination
-	with the ``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to
-	compressed formats only. It is also only applies to stateful codecs.
+	parameters are detected.
+
+	This flag can only be used in combination with the
+	``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to
+	compressed formats only. This flag is valid for stateful codecs only.
+    * - ``V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL``
+      - 0x0010
+      - The hardware encoder supports setting the ``CAPTURE`` coded frame
+	interval separately from the ``OUTPUT`` raw frame interval.
+	Setting the ``OUTPUT`` raw frame interval with :ref:`VIDIOC_S_PARM <VIDIOC_G_PARM>`
+	also sets the ``CAPTURE`` coded frame interval to the same value.
+	If this flag is set, then the ``CAPTURE`` coded frame interval can be
+	set to a different value afterwards. This is typically used for
+	offline encoding where the ``OUTPUT`` raw frame interval is used as
+	a hint for reserving hardware encoder resources and the ``CAPTURE`` coded
+	frame interval is the actual frame rate embedded in the encoded video
+	stream.
+
+	This flag can only be used in combination with the
+	``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to
+        compressed formats only. This flag is valid for stateful encoders only.
 
 
 Return Value

Documentation/userspace-api/media/videodev2.h.rst.exceptions

@@ -187,6 +187,7 @@ replace define V4L2_FMT_FLAG_COMPRESSED fmtdesc-flags
 replace define V4L2_FMT_FLAG_EMULATED fmtdesc-flags
 replace define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM fmtdesc-flags
 replace define V4L2_FMT_FLAG_DYN_RESOLUTION fmtdesc-flags
+replace define V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL fmtdesc-flags
 
 # V4L2 timecode types
 replace define V4L2_TC_TYPE_24FPS timecode-type

include/uapi/linux/videodev2.h

@@ -794,6 +794,7 @@ struct v4l2_fmtdesc {
 #define V4L2_FMT_FLAG_EMULATED			0x0002
 #define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM	0x0004
 #define V4L2_FMT_FLAG_DYN_RESOLUTION		0x0008
+#define V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL	0x0010
 
 	/* Frame Size and frame rate enumeration */
 /*