mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-17 15:47:53 +01:00
ee84d39fce
Multichannel signals are downmixed to mono before decimation and delay estimation. This is useful when not all channels play audio content. The feature can be toggled in the AEC3 configuration. Bug: webrtc:10913 Change-Id: I7d40edf7732bb51fec69e7f3ca063d821c5069c4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/151762 Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29126}
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|
|
#define MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|
|
|
|
#include <array>
|
|
#include <vector>
|
|
|
|
#include "api/array_view.h"
|
|
#include "modules/audio_processing/aec3/aec3_common.h"
|
|
#include "modules/audio_processing/utility/cascaded_biquad_filter.h"
|
|
#include "rtc_base/constructor_magic.h"
|
|
|
|
namespace webrtc {
|
|
|
|
// Provides functionality for decimating a signal.
|
|
class Decimator {
|
|
public:
|
|
explicit Decimator(size_t down_sampling_factor);
|
|
|
|
// Downsamples the signal.
|
|
void Decimate(const std::vector<std::vector<float>>& in,
|
|
bool downmix,
|
|
rtc::ArrayView<float> out);
|
|
|
|
private:
|
|
const size_t down_sampling_factor_;
|
|
CascadedBiQuadFilter anti_aliasing_filter_;
|
|
CascadedBiQuadFilter noise_reduction_filter_;
|
|
|
|
RTC_DISALLOW_COPY_AND_ASSIGN(Decimator);
|
|
};
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|