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audio_processing/aec: Fixes an incorrect sampling rate multiplier when processing in 48 kHz

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In AEC a fixed fft size is used, but processing can in the lower band be in either 8 or 16 kHz.
Therefore we need a multiplier/rate factor to, for example, map frequency bands in Hz to frequency bins.

The multiplier/rate factor can only be either 1 or 2, but when 48 kHz support was added it was assigned 3.

BUG=crbug.com/482424
R=aluebs@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/43329004

Cr-Commit-Position: refs/heads/master@{#9117}
This commit is contained in:
Bjorn Volcker 2015-04-29 20:22:44 +02:00
parent efbde3775b
commit 3cfa756f37
1 changed files with 4 additions and 3 deletions
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7
webrtc/modules/audio_processing/aec/aec_core.c
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@ -1607,10 +1607,11 @@ int WebRtcAec_InitAec(AecCore* aec, int sampFreq) {
// Default target suppression mode.
aec->nlp_mode = 1;
// Sampling frequency multiplier
// SWB is processed as 160 frame size
// Sampling frequency multiplier w.r.t. 8 kHz.
// In case of multiple bands we process the lower band in 16 kHz, hence the
// multiplier is always 2.
if (aec->num_bands > 1) {
aec->mult = (short)aec->sampFreq / 16000;
aec->mult = 2;
} else {
aec->mult = (short)aec->sampFreq / 8000;
}