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Optimize the AGC2 Biquad filter.

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Bug: None
Change-Id: Idde77efd209be1687405d3f256ca52e2da640c1e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264561
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Commit-Queue: Christian Schuldt <cschuldt@google.com>
Cr-Commit-Position: refs/heads/main@{#37278}
This commit is contained in:
cschuldt
2022-05-31 14:52:39 +02:00
committed by WebRTC LUCI CQ
parent 0413fc969c
commit c6014bcbb1
1 changed files with 21 additions and 8 deletions
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29
modules/audio_processing/agc2/biquad_filter.cc
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@ -31,17 +31,30 @@ void BiQuadFilter::Reset() {
void BiQuadFilter::Process(rtc::ArrayView<const float> x,
rtc::ArrayView<float> y) {
RTC_DCHECK_EQ(x.size(), y.size());
for (size_t k = 0; k < x.size(); ++k) {
const float config_a0 = config_.a[0];
const float config_a1 = config_.a[1];
const float config_b0 = config_.b[0];
const float config_b1 = config_.b[1];
const float config_b2 = config_.b[2];
float state_a0 = state_.a[0];
float state_a1 = state_.a[1];
float state_b0 = state_.b[0];
float state_b1 = state_.b[1];
for (size_t k = 0, x_size = x.size(); k < x_size; ++k) {
// Use a temporary variable for `x[k]` to allow in-place processing.
const float tmp = x[k];
y[k] = config_.b[0] * tmp + config_.b[1] * state_.b[0] +
config_.b[2] * state_.b[1] - config_.a[0] * state_.a[0] -
config_.a[1] * state_.a[1];
state_.b[1] = state_.b[0];
state_.b[0] = tmp;
state_.a[1] = state_.a[0];
state_.a[0] = y[k];
float y_k = config_b0 * tmp + config_b1 * state_b0 + config_b2 * state_b1 -
config_a0 * state_a0 - config_a1 * state_a1;
state_b1 = state_b0;
state_b0 = tmp;
state_a1 = state_a0;
state_a0 = y_k;
y[k] = y_k;
}
state_.a[0] = state_a0;
state_.a[1] = state_a1;
state_.b[0] = state_b0;
state_.b[1] = state_b1;
}
} // namespace webrtc