API changes, most recent first:
+2011-xx-xx - xxxxxxx - lavu 51.18.0
+ Add av_samples_get_buffer_size(), av_samples_fill_arrays(), and
+ av_samples_alloc(), to samplefmt.h.
+
2011-xx-xx - xxxxxxx - lavu 51.17.0
Add planar sample formats and av_sample_fmt_is_planar() to samplefmt.h.