76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/*
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* Copyright (c) 2018 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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#ifndef API_AUDIO_ECHO_CONTROL_H_
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#define API_AUDIO_ECHO_CONTROL_H_
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#include <memory>
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#include "rtc_base/checks.h"
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namespace webrtc {
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class AudioBuffer;
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// Interface for an acoustic echo cancellation (AEC) submodule.
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class EchoControl {
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public:
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// Analysis (not changing) of the render signal.
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virtual void AnalyzeRender(AudioBuffer* render) = 0;
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// Analysis (not changing) of the capture signal.
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virtual void AnalyzeCapture(AudioBuffer* capture) = 0;
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// Processes the capture signal in order to remove the echo.
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virtual void ProcessCapture(AudioBuffer* capture, bool level_change) = 0;
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// As above, but also returns the linear filter output.
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virtual void ProcessCapture(AudioBuffer* capture,
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AudioBuffer* linear_output,
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bool level_change) = 0;
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struct Metrics {
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double echo_return_loss;
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double echo_return_loss_enhancement;
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int delay_ms;
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};
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// Collect current metrics from the echo controller.
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virtual Metrics GetMetrics() const = 0;
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// Provides an optional external estimate of the audio buffer delay.
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virtual void SetAudioBufferDelay(int delay_ms) = 0;
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// Specifies whether the capture output will be used. The purpose of this is
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// to allow the echo controller to deactivate some of the processing when the
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// resulting output is anyway not used, for instance when the endpoint is
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// muted.
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// TODO(b/177830919): Make pure virtual.
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virtual void SetCaptureOutputUsage(bool capture_output_used) {}
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// Returns wheter the signal is altered.
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virtual bool ActiveProcessing() const = 0;
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virtual ~EchoControl() {}
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};
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// Interface for a factory that creates EchoControllers.
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class EchoControlFactory {
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public:
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virtual std::unique_ptr<EchoControl> Create(int sample_rate_hz,
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int num_render_channels,
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int num_capture_channels) = 0;
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virtual ~EchoControlFactory() = default;
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};
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} // namespace webrtc
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#endif // API_AUDIO_ECHO_CONTROL_H_
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