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Truncated delay quality to avoid negative return values

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This forces the output of last_delay_quality to the interval [0, 1] in Q14.

BUG=none
TESTED=audioproc_unittest, trybot

Review URL: https://webrtc-codereview.appspot.com/1211004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3675 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
bjornv@webrtc.org 2013-03-18 14:15:12 +00:00
parent bda7f305c5
commit 04ecd49ec5
1 changed files with 7 additions and 2 deletions
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9
webrtc/modules/audio_processing/utility/delay_estimator.c
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@ -302,6 +302,7 @@ int WebRtc_binary_last_delay(BinaryDelayEstimator* self) {
}
int WebRtc_binary_last_delay_quality(BinaryDelayEstimator* self) {
int delay_quality = 0;
assert(self != NULL);
// |last_delay_probability| is the opposite of quality and states how deep the
// minimum of the cost function is. The value states how many non-matching
@ -309,8 +310,12 @@ int WebRtc_binary_last_delay_quality(BinaryDelayEstimator* self) {
// estimate. The range is thus from 0 to 32, since we use 32 bits in the
// binary spectra.
// Return the quality = 1 - |last_delay_probability| / 32 (in Q14).
return (32 << 9) - self->last_delay_probability;
// Return the |delay_quality| = 1 - |last_delay_probability| / 32 (in Q14).
delay_quality = (32 << 9) - self->last_delay_probability;
if (delay_quality < 0) {
delay_quality = 0;
}
return delay_quality;
}
void WebRtc_MeanEstimatorFix(int32_t new_value,