#define AO_FEC_DECODE_BLOCK (32) /* callback must return multiples of this many bits */
+#define AO_FEC_DECODE_CRC_OK 0x80 /* stored in out[out_len-1] */
+
uint8_t
ao_fec_decode(const uint8_t *in, uint16_t in_len, uint8_t *out, uint8_t out_len, uint16_t (*callback)());