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media: videodev2.h: add V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM
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>
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3 changed files with 12 additions and 2 deletions
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@ -127,6 +127,14 @@ one until ``EINVAL`` is returned.
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- This format is not native to the device but emulated through
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software (usually libv4l2), where possible try to use a native
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format instead for better performance.
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* - ``V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM``
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- 0x0004
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- The hardware decoder for this compressed bytestream format (aka coded
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format) is capable of parsing a continuous bytestream. Applications do
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not need to parse the bytestream themselves to find the boundaries
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between frames/fields. This flag can only be used in combination with
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the ``V4L2_FMT_FLAG_COMPRESSED`` flag, since this applies to compressed
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formats only. This flag is valid for stateful decoders only.
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Return Value
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@ -180,6 +180,7 @@ replace define V4L2_PIX_FMT_FLAG_PREMUL_ALPHA reserved-formats
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# V4L2 format flags
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replace define V4L2_FMT_FLAG_COMPRESSED fmtdesc-flags
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replace define V4L2_FMT_FLAG_EMULATED fmtdesc-flags
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replace define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM fmtdesc-flags
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# V4L2 timecode types
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replace define V4L2_TC_TYPE_24FPS timecode-type
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@ -774,8 +774,9 @@ struct v4l2_fmtdesc {
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__u32 reserved[4];
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};
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#define V4L2_FMT_FLAG_COMPRESSED 0x0001
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#define V4L2_FMT_FLAG_EMULATED 0x0002
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#define V4L2_FMT_FLAG_COMPRESSED 0x0001
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#define V4L2_FMT_FLAG_EMULATED 0x0002
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#define V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM 0x0004
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/* Frame Size and frame rate enumeration */
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/*
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