amvdec_am21c_head_size
u32 head_size = amvdec_am21c_head_size(sess->width, sess->height);
EXPORT_SYMBOL_GPL(amvdec_am21c_head_size);
amvdec_am21c_head_size(width, height), SZ_64K);
u32 amvdec_am21c_head_size(u32 width, u32 height);