User data propagation for video codecs

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Hi

For video decoder, our video driver, which is V4l2 based, exposes two
capabilities:

1. V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE for transaction of compressed buffers.
2. V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE for transaction of
decoded/uncompressed buffers.

We have a requirement to propagate "user specific data" from compressed
buffer to uncompressed buffer. We are not able to find any field in
"struct v4l2_buffer" which can be used for this purpose. Please suggest if
this can be achieved with current V4L2 framework.


Thanks
Vinay

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