API changes, most recent first:
+2016-xx-xx - xxxxxxx
+ Change av_sha_update() and av_md5_sum()/av_md5_update() length
+ parameter type to size_t at next major bump.
+
2016-xx-xx - xxxxxxx - lavc 57.29.0 - avcodec.h
Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping
information from containers.