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avcodec: export motion vectors in frame side data on demand

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The reasoning behind this addition is that various third party
applications are interested in getting some motion information out of a
video "for free" when it is available.

It was considered to export other information as well (such as the intra
information about the block, or the quantization) but the structure
might have ended up into a half full-generic, half full of codec
specific cruft. If more information is necessary, it should either be
added in the "flags" field of the AVMotionVector structure, or in
another side-data.

This commit also includes an example exporting them in a CSV stream.
This commit is contained in:
Clément Bœsch
2014-07-16 16:42:42 +02:00
parent c5f43c8888
commit b0352b1997
15 changed files with 360 additions and 2 deletions
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doc/APIchanges
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@@ -15,6 +15,9 @@ libavutil: 2014-08-09
API changes, most recent first:
2014-08-xx - xxxxxxx - lavu 54.5.100 - frame.h motion_vector.h
Add AV_FRAME_DATA_MOTION_VECTORS side data and AVMotionVector structure
2014-08-16 - xxxxxxx - lswr 1.1.100 - swresample.h
Add AVFrame based API