C/C++ - Convert 24-bit signed integer to float
- by e-t172
I'm programming in C++. I need to convert a 24-bit signed integer (stored in a 3-byte array) to float (normalizing to [-1.0,1.0]).
The platform is MSVC++ on x86 (which means the input is little-endian).
I tried this:
float convert(const unsigned char* src)
{
int i = src[2];
i = (i << 8) | src[1];
i = (i << 8) | src[0];
const float Q = 2.0 / ((1 << 24) - 1.0);
return (i + 0.5) * Q;
}
I'm not entirely sure, but it seems the results I'm getting from this code are incorrect. So, is my code wrong and if so, why?
