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/*
* Copyright (c) 2022 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_MULTI_CHANNEL_CONTENT_DETECTOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_MULTI_CHANNEL_CONTENT_DETECTOR_H_
#include <stddef.h>
#include <vector>
namespace webrtc {
// Analyzes audio content to determine whether the contained audio is proper
// multichannel, or only upmixed mono. To allow for differences introduced by
// hardware drivers, a threshold `detection_threshold` is used for the
// detection.
class MultiChannelContentDetector {
public:
MultiChannelContentDetector(bool detect_stereo_content,
int num_render_input_channels,
float detection_threshold);
// Compares the left and right channels in the render `frame` to determine
// whether the signal is a proper multichannel signal. Returns a bool
// indicating whether a change in the multichannel was detected.
bool UpdateDetection(
const std::vector<std::vector<std::vector<float>>>& frame);
bool IsMultiChannelContentDetected() const {
return proper_multichannel_content_detected_;
}
private:
const bool detect_stereo_content_;
const float detection_threshold_;
bool proper_multichannel_content_detected_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_MULTI_CHANNEL_CONTENT_DETECTOR_H_
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