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Add dot_product function for use by the G.723.1 decoder

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This commit is contained in:
Mohamed Naufal Basheer 2011-03-17 23:56:48 +01:00 committed by Michael Niedermayer
parent bcc67dffa0
commit a82c6238ae
2 changed files with 23 additions and 0 deletions
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12
libavcodec/celp_math.c
View File

@ -25,6 +25,7 @@
#include <assert.h>
#include "avcodec.h"
#include "mathops.h"
#include "celp_math.h"
#ifdef G729_BITEXACT
@ -196,6 +197,17 @@ int ff_log2(uint32_t value)
return (power_int << 15) + value;
}
int ff_dot_product(const int16_t *a, const int16_t *b, int length, int shift)
{
int i, sum = 0;
for (i = 0; i < length; i++) {
int64_t prod = av_clipl_int32(MUL64(a[i], b[i]) << shift);
sum = av_clipl_int32(sum + prod);
}
return sum;
}
float ff_dot_productf(const float* a, const float* b, int length)
{
float sum = 0;

11
libavcodec/celp_math.h
View File

@ -63,6 +63,17 @@ static inline int bidir_sal(int value, int offset)
else return value << offset;
}
/**
* returns the dot product of 2 int16_t vectors.
* @param a input data array
* @param b input data array
* @param length number of elements
* @param shift the result is scaled by 2^shift
*
* @return dot product = sum of elementwise products
*/
int ff_dot_product(const int16_t *a, const int16_t *b, int length, int shift);
/**
* returns the dot product.
* @param a input data array