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media: videodev2.h: add V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM

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Add an enum_fmt format flag to specifically tag coded formats where
full bytestream parsing is supported by the device.

Some stateful decoders are capable of fully parsing a bytestream,
but others require that userspace pre-parses the bytestream into
frames or fields (see the corresponding pixelformat descriptions
for details).

If this flag is set, then this pre-parsing step is not required
(but still possible, of course).

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-08-15 11:44:45 -03:00 committed by Mauro Carvalho Chehab
parent 760327930e
commit 2b770bee78
3 changed files with 12 additions and 2 deletions
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8
Documentation/media/uapi/v4l/vidioc-enum-fmt.rst
View File

@ -127,6 +127,14 @@ one until ``EINVAL`` is returned.
- This format is not native to the device but emulated through
software (usually libv4l2), where possible try to use a native
format instead for better performance.
* - ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
- 0x0004
- 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
formats only. This flag is valid for stateful decoders only.
Return Value

1
Documentation/media/videodev2.h.rst.exceptions
View File

@ -180,6 +180,7 @@ replace define V4L2_PIX_FMT_FLAG_PREMUL_ALPHA reserved-formats
# V4L2 format flags
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
# V4L2 timecode types
replace define V4L2_TC_TYPE_24FPS timecode-type

5
include/uapi/linux/videodev2.h
View File

@ -774,8 +774,9 @@ struct v4l2_fmtdesc {
__u32 reserved[4];
};
#define V4L2_FMT_FLAG_COMPRESSED 0x0001
#define V4L2_FMT_FLAG_EMULATED 0x0002
#define V4L2_FMT_FLAG_COMPRESSED 0x0001
#define V4L2_FMT_FLAG_EMULATED 0x0002
#define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM 0x0004
/* Frame Size and frame rate enumeration */
/*