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/*
* Copyright (c) 2012 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_ECHO_CONTROL_MOBILE_IMPL_H_
#define MODULES_AUDIO_PROCESSING_ECHO_CONTROL_MOBILE_IMPL_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "api/array_view.h"
namespace webrtc {
class AudioBuffer;
// The acoustic echo control for mobile (AECM) component is a low complexity
// robust option intended for use on mobile devices.
class EchoControlMobileImpl {
public:
EchoControlMobileImpl();
~EchoControlMobileImpl();
// Recommended settings for particular audio routes. In general, the louder
// the echo is expected to be, the higher this value should be set. The
// preferred setting may vary from device to device.
enum RoutingMode {
kQuietEarpieceOrHeadset,
kEarpiece,
kLoudEarpiece,
kSpeakerphone,
kLoudSpeakerphone
};
// Sets echo control appropriate for the audio routing `mode` on the device.
// It can and should be updated during a call if the audio routing changes.
int set_routing_mode(RoutingMode mode);
RoutingMode routing_mode() const;
// Comfort noise replaces suppressed background noise to maintain a
// consistent signal level.
int enable_comfort_noise(bool enable);
bool is_comfort_noise_enabled() const;
void ProcessRenderAudio(rtc::ArrayView<const int16_t> packed_render_audio);
int ProcessCaptureAudio(AudioBuffer* audio, int stream_delay_ms);
void Initialize(int sample_rate_hz,
size_t num_reverse_channels,
size_t num_output_channels);
static void PackRenderAudioBuffer(const AudioBuffer* audio,
size_t num_output_channels,
size_t num_channels,
std::vector<int16_t>* packed_buffer);
static size_t NumCancellersRequired(size_t num_output_channels,
size_t num_reverse_channels);
private:
class Canceller;
struct StreamProperties;
int Configure();
RoutingMode routing_mode_;
bool comfort_noise_enabled_;
std::vector<std::unique_ptr<Canceller>> cancellers_;
std::unique_ptr<StreamProperties> stream_properties_;
std::vector<std::array<int16_t, 160>> low_pass_reference_;
bool reference_copied_ = false;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_ECHO_CONTROL_MOBILE_IMPL_H_
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