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Fix vp9_compute_qdelta_by_rate loop behavior

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The return value from vp9_compute_qdelta_by_rate, which is
a delta value for the quantizer, could never be 0 if
(qindex == rc->worst_quality).

This occurs because target_index was setup unconditionally
in the loop and yet the loop counter stopped at
(rc->worst_quality - 1).

Change-Id: I6b59cd9b5811ff33357e71cd7d814c5e53d291f2
This commit is contained in:
Adrian Grange 2015-03-10 09:14:54 -07:00
parent 6eaca27df2
commit 78df712216
1 changed files with 4 additions and 3 deletions
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7
vp9/encoder/vp9_ratectrl.c
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@ -1595,11 +1595,12 @@ int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
// Convert the q target to an index
for (i = rc->best_quality; i < rc->worst_quality; ++i) {
target_index = i;
if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <= target_bits_per_mb)
if (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
target_bits_per_mb) {
target_index = i;
break;
}
}
return target_index - qindex;
}