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Merge "Add dynamic range comment to vp9_satd"

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Jingning Han 2015-06-18 19:36:52 +00:00 committed by Gerrit Code Review
commit d1398e9f13
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;
}