//
// libtgvoip is free and unencumbered public domain software.
// For more information, see http://unlicense.org or the UNLICENSE file
// you should have received with this source code distribution.
//

#ifndef LIBTGVOIP_MEDIASTREAMINPUT_H
#define LIBTGVOIP_MEDIASTREAMINPUT_H

#include <string.h>
#include <vector>
#include <memory>
#include <stdint.h>
#include "tools/threading.h"
#include "tools/BlockingQueue.h"
#include "tools/Buffers.h"

namespace tgvoip
{

class EchoCanceller;

class MediaStreamItf
{
public:
	virtual void Start() = 0;
	virtual void Stop() = 0;
	void SetCallback(size_t (*f)(unsigned char *, size_t, void *), void *param);

	//protected:
	size_t InvokeCallback(unsigned char *data, size_t length);

private:
	size_t (*callback)(unsigned char *, size_t, void *) = NULL;
	void *callbackParam;
};

class AudioMixer : public MediaStreamItf
{
public:
	AudioMixer();
	virtual ~AudioMixer();
	void SetOutput(MediaStreamItf *output);
	virtual void Start();
	virtual void Stop();
	void AddInput(std::shared_ptr<MediaStreamItf> input);
	void RemoveInput(std::shared_ptr<MediaStreamItf> input);
	void SetInputVolume(std::shared_ptr<MediaStreamItf> input, float volumeDB);
	void SetEchoCanceller(EchoCanceller *aec);

private:
	void RunThread();
	struct MixerInput
	{
		std::shared_ptr<MediaStreamItf> source;
		float multiplier;
	};
	Mutex inputsMutex;
	void DoCallback(unsigned char *data, size_t length);
	static size_t OutputCallback(unsigned char *data, size_t length, void *arg);
	std::vector<MixerInput> inputs;
	Thread *thread;
	BufferPool<960 * 2, 16> bufferPool;
	BlockingQueue<Buffer> processedQueue;
	Semaphore semaphore;
	EchoCanceller *echoCanceller;
	bool running;
};

class CallbackWrapper : public MediaStreamItf
{
public:
	CallbackWrapper(){};
	virtual ~CallbackWrapper(){};
	virtual void Start(){};
	virtual void Stop(){};
};

class AudioLevelMeter
{
public:
	AudioLevelMeter();
	float GetLevel();
	void Update(int16_t *samples, size_t count);

private:
	int16_t absMax;
	int16_t count;
	int8_t currentLevel;
	int16_t currentLevelFullRange;
};
}; // namespace tgvoip

#endif //LIBTGVOIP_MEDIASTREAMINPUT_H