mul_poly         1600 libavcodec/ac3enc.c             r = mul_poly(r, a, poly);
mul_poly         1601 libavcodec/ac3enc.c         a = mul_poly(a, a, poly);
mul_poly         1636 libavcodec/ac3enc.c     crc1    = mul_poly(crc_inv, crc1, CRC16_POLY);