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Add ff_dot_productf() to celp_math.{c,h}

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Part of the QCELP patch by Kenan Gillet, kenan.gillet gmail com

Originally committed as revision 15753 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kenan Gillet 2008-10-30 21:04:17 +00:00 committed by Vitor Sessak
parent 8c31f18bf9
commit 0bc484ad51
2 changed files with 21 additions and 0 deletions
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11
libavcodec/celp_math.c
View File

@ -195,3 +195,14 @@ int ff_log2(uint32_t value)
return (power_int << 15) + value;
}
float ff_dot_productf(const float* a, const float* b, int length)
{
float sum = 0;
int i;
for(i=0; i<length; i++)
sum += a[i] * b[i];
return sum;
}

10
libavcodec/celp_math.h
View File

@ -83,4 +83,14 @@ static inline int bidir_sal(int value, int offset)
else return value << offset;
}
/**
* returns the dot product.
* @param a input data array
* @param b input data array
* @param length number of elements
*
* @return dot product = sum of elementwise products
*/
extern float ff_dot_productf(const float* a, const float* b, int length);
#endif /* AVCODEC_CELP_MATH_H */