VIANC/pw_plugin/micpath.h

#include "stream_wrapper.h"
#include "ringbuffer.h"
#include "passthrough.h"

#include "lustre/dsp_EchoCancel.h"
#include <mutex>

struct aec_params {
	float noise_power = 0.0f;
	float echo_return_gain = 1.0f;

	float fast_learn_rate = 1.0f/128;
	float learn_rate = 1.0f/1280;

	int sample_delay = 0;
	bool valid = false;

	bool force_learn = true;
};

class aec_stream : public pwstream {
public:
	aec_stream(pw_loop* lp, ringbuffer* hp, ringbuffer* mic,
		logger_record& record_stream, aec_params p = {});
	
	aec_params get_aec_params();
	void on_process() override;

	float cov[8192]; // From 1024 to 1024+2048 delay ?
	_real h[256];
	int cnt = 0;
private:
	logger_record& pstrm;

	ringbuffer* hp_rb;
	ringbuffer* mic_rb;

	enum {INIT, SKIP_EARLY, SCAN_SILENT, SCAN_LOUD, ACTIVE, INACTIVE} status;
	int remaining_samples = -1; // Remaining samples in current phase

	aec_params params;
	std::mutex prm_mutex;

	dsp_EchoCancel_ctx_type* ctx;
};