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Add dynamic range comment to vp9_satd

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Change-Id: I75873846e6fdafbe7597a1bd0192115d2d1e9987
This commit is contained in:
Jingning Han 2015-06-16 14:35:00 -07:00
parent 8914ab696d
commit 4f1f510f16
1 changed files with 3 additions and 0 deletions
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vp9/encoder/vp9_avg.c
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@ -115,12 +115,15 @@ void vp9_hadamard_16x16_c(int16_t const *src_diff, int src_stride,
}
}
// coeff: 16 bits, dynamic range [-32640, 32640].
// length: value range {16, 64, 256, 1024}.
int16_t vp9_satd_c(const int16_t *coeff, int length) {
int i;
int satd = 0;
for (i = 0; i < length; ++i)
satd += abs(coeff[i]);
// satd: 26 bits, dynamic range [-32640 * 1024, 32640 * 1024]
return (int16_t)satd;
}