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6a05bb1b12
This CL adds code for doing signal-dependent downmixing before the delay estimation in the multichannel case. As part of the CL, the unittests of the render delay controller are corrected. However, as that caused some of them to fail, the CL (for now) as well disables the failing test. Bug: webrtc:11153,chromium:1029740, webrtc:11161 Change-Id: I0b765c28fa5e547aabd6dfbd24b626ff9a16346f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161045 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29980}
91 lines
3.7 KiB
C++
91 lines
3.7 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/audio_processing/aec3/decimator.h"
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#include <array>
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#include <vector>
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace {
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// signal.butter(2, 3400/8000.0, 'lowpass', analog=False)
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const std::vector<CascadedBiQuadFilter::BiQuadParam> GetLowPassFilterDS2() {
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return std::vector<CascadedBiQuadFilter::BiQuadParam>{
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{{-1.f, 0.f}, {0.13833231f, 0.40743176f}, 0.22711796393486466f},
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{{-1.f, 0.f}, {0.13833231f, 0.40743176f}, 0.22711796393486466f},
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{{-1.f, 0.f}, {0.13833231f, 0.40743176f}, 0.22711796393486466f}};
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}
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// signal.ellip(6, 1, 40, 1800/8000, btype='lowpass', analog=False)
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const std::vector<CascadedBiQuadFilter::BiQuadParam> GetLowPassFilterDS4() {
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return std::vector<CascadedBiQuadFilter::BiQuadParam>{
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{{-0.08873842f, 0.99605496f}, {0.75916227f, 0.23841065f}, 0.26250696827f},
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{{0.62273832f, 0.78243018f}, {0.74892112f, 0.5410152f}, 0.26250696827f},
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{{0.71107693f, 0.70311421f}, {0.74895534f, 0.63924616f}, 0.26250696827f}};
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}
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// signal.cheby1(1, 6, [1000/8000, 2000/8000], btype='bandpass', analog=False)
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const std::vector<CascadedBiQuadFilter::BiQuadParam> GetBandPassFilterDS8() {
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return std::vector<CascadedBiQuadFilter::BiQuadParam>{
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{{1.f, 0.f}, {0.7601815f, 0.46423542f}, 0.10330478266505948f, true},
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{{1.f, 0.f}, {0.7601815f, 0.46423542f}, 0.10330478266505948f, true},
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{{1.f, 0.f}, {0.7601815f, 0.46423542f}, 0.10330478266505948f, true},
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{{1.f, 0.f}, {0.7601815f, 0.46423542f}, 0.10330478266505948f, true},
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{{1.f, 0.f}, {0.7601815f, 0.46423542f}, 0.10330478266505948f, true}};
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}
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// signal.butter(2, 1000/8000.0, 'highpass', analog=False)
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const std::vector<CascadedBiQuadFilter::BiQuadParam> GetHighPassFilter() {
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return std::vector<CascadedBiQuadFilter::BiQuadParam>{
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{{1.f, 0.f}, {0.72712179f, 0.21296904f}, 0.7570763753338849f}};
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}
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const std::vector<CascadedBiQuadFilter::BiQuadParam> GetPassThroughFilter() {
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return std::vector<CascadedBiQuadFilter::BiQuadParam>{};
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}
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} // namespace
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Decimator::Decimator(size_t down_sampling_factor)
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: down_sampling_factor_(down_sampling_factor),
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anti_aliasing_filter_(down_sampling_factor_ == 4
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? GetLowPassFilterDS4()
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: (down_sampling_factor_ == 8
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? GetBandPassFilterDS8()
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: GetLowPassFilterDS2())),
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noise_reduction_filter_(down_sampling_factor_ == 8
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? GetPassThroughFilter()
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: GetHighPassFilter()) {
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RTC_DCHECK(down_sampling_factor_ == 2 || down_sampling_factor_ == 4 ||
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down_sampling_factor_ == 8);
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}
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void Decimator::Decimate(rtc::ArrayView<const float> in,
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rtc::ArrayView<float> out) {
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RTC_DCHECK_EQ(kBlockSize, in.size());
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RTC_DCHECK_EQ(kBlockSize / down_sampling_factor_, out.size());
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std::array<float, kBlockSize> x;
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// Limit the frequency content of the signal to avoid aliasing.
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anti_aliasing_filter_.Process(in, x);
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// Reduce the impact of near-end noise.
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noise_reduction_filter_.Process(x);
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// Downsample the signal.
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for (size_t j = 0, k = 0; j < out.size(); ++j, k += down_sampling_factor_) {
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RTC_DCHECK_GT(kBlockSize, k);
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out[j] = x[k];
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}
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}
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} // namespace webrtc
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