Microsoft DirectX 9.0 |

`The `**Int64x32Div32 **function implements the formula ((a*b)+rnd)/c where *a* is a 64-bit value and *b*, *c*, and *rnd* are 32-bit values.

Time stamps and seek times are 64-bit values, so this function is useful for performing conversions on 32-bit systems. For example, in MPEG-1 the system clock reference is 90-kHz, or 90,000 ticks per second. The formula to convert this to reference time (100-nanosecond units) is

```
(timestamp * 1000) / 9
```

which can be calculated as `Int64x32Div32(`

timestamp`, 1000, 9, 0)`

. Use the *rnd* parameter as a rounding factor.

**Syntax**

**LONGLONG WINAPI Int64x32Div32(
** **LONGLONG** *a*,
**LONG** *b*,
**LONG** *c*,
**LONG** *rnd*
**);**

**Return Value**

Returns either the (a * b + rnd)/c calculation or one of the following values.

0x7FFFFFFFFFFFFFFF | Overflow occurred because the result is too large (positive). |

0x8000000000000000 | Overflow occurred because the result is too large (negative). |

**Remarks**

Rounding on the division is toward zero. Division by zero is counted as an overflow condition.

**See Also**