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media: videodev2.h: add V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL flag

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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>
This commit is contained in:
Hans Verkuil 2020-05-26 10:59:53 +02:00 committed by Mauro Carvalho Chehab
parent eef7a5e730
commit 286cf7d3a9
3 changed files with 27 additions and 5 deletions
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30
Documentation/userspace-api/media/v4l/vidioc-enum-fmt.rst
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@ -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

1
Documentation/userspace-api/media/videodev2.h.rst.exceptions
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@ -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

1
include/uapi/linux/videodev2.h
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@ -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 */
/*