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celp_math: cleanup ff_dot_product()

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based on code & idea by vitor

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2011-09-29 21:21:26 +02:00
parent 84f8aef40c
commit 11512367d3
3 changed files with 16 additions and 17 deletions
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12
libavcodec/celp_math.c
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@@ -197,14 +197,14 @@ 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 ff_dot_product(const int16_t *a, const int16_t *b, int length)
{
int i, sum = 0;
int i;
int64_t sum = 0;
for (i = 0; i < length; i++)
sum += MUL16(a[i], b[i]);
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;
}