llMulDiv
| Microsoft DirectShow 9.0 |
llMulDiv
The llMulDiv function implements the formula ((a*b)+rnd)/c where each term is a 64-bit value.
Time stamps and seek times are 64-bit values, so this function is useful for performing conversions on 32-bit systems. For example, the formula for bytes-per-second is
(Number of Bytes * Reference Time) / 10,000,000
which can be calculated as llMulDiv(nBytes, rtTime, 10000000, 0). Use the rnd parameter as a rounding factor.
Syntax
LONGLONG WINAPI llMulDiv( LONGLONG a, LONGLONG b, LONGLONG c, LONGLONG 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.
Requirements
** Header:** Declared in Wxutil.h; include Streams.h.
** Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).
See Also