/*************************************************************************/
/*  cp_mixer.h                                                           */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#ifndef CP_MIXER_H
#define CP_MIXER_H

#include "cp_sample_defs.h"

/**Abstract base class representing a mixer
  *@author Juan Linietsky
  */

/******************************
 mixer.h
 ----------

Abstract base class for the mixer.
This is what the player uses to setup
voices and stuff.. this way
it can be abstracted to hardware
devices or other stuff..
********************************/

class CPSample_ID; /* need this */

class CPMixer {
public:
	enum {

		FREQUENCY_BITS = 8

	};

	enum ReverbMode {
		REVERB_MODE_ROOM,
		REVERB_MODE_STUDIO_SMALL,
		REVERB_MODE_STUDIO_MEDIUM,
		REVERB_MODE_STUDIO_LARGE,
		REVERB_MODE_HALL,
		REVERB_MODE_SPACE_ECHO,
		REVERB_MODE_ECHO,
		REVERB_MODE_DELAY,
		REVERB_MODE_HALF_ECHO
	};

	/* Callback */

	virtual void set_callback_interval(int p_interval_us) = 0; //in usecs, for tracker it's 2500000/tempo
	virtual void set_callback(void (*p_callback)(void *), void *p_userdata) = 0;

	/* Voice Control */

	virtual void setup_voice(int p_voice_index, CPSample_ID p_sample_id, int32_t p_start_index) = 0;
	virtual void stop_voice(int p_voice_index) = 0;
	virtual void set_voice_frequency(int p_voice_index, int32_t p_freq) = 0; //in freq*FREQUENCY_BITS
	virtual void set_voice_panning(int p_voice_index, int p_pan) = 0;
	virtual void set_voice_volume(int p_voice_index, int p_vol) = 0;
	virtual void set_voice_filter(int p_filter, bool p_enabled, uint8_t p_cutoff, uint8_t p_resonance) = 0;
	virtual void set_voice_reverb_send(int p_voice_index, int p_reverb) = 0;
	virtual void set_voice_chorus_send(int p_voice_index, int p_chorus) = 0; /* 0 - 255 */

	virtual void set_reverb_mode(ReverbMode p_mode) = 0;
	virtual void set_chorus_params(unsigned int p_delay_ms, unsigned int p_separation_ms, unsigned int p_depth_ms10, unsigned int p_speed_hz10) = 0;

	/* Info retrieving */

	virtual int32_t get_voice_sample_pos_index(int p_voice_index) = 0;
	virtual int get_voice_panning(int p_voice_index) = 0;
	virtual int get_voice_volume(int p_voice_index) = 0;
	virtual CPSample_ID get_voice_sample_id(int p_voice_index) = 0;
	virtual bool is_voice_active(int p_voice_index) = 0;
	virtual int get_active_voice_count() = 0;
	virtual int get_total_voice_count() = 0;

	virtual uint32_t get_mix_frequency() = 0; //if mixer is not software, return 0

	/* Methods below only work with software mixers, meant for software-based sound drivers, hardware mixers ignore them */
	virtual int32_t process(int32_t p_frames) = 0; /* Call this to process N frames, returns how much it was processed */
	virtual int32_t *get_mixdown_buffer_ptr() = 0; /* retrieve what was mixed */
	virtual void set_mix_frequency(int32_t p_mix_frequency) = 0;

	virtual ~CPMixer() {}
};

#endif