text: /*************************************************************************/
  /*  event_stream_chibi.h                                                 */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
  /*                                                                       */
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  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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  /*************************************************************************/
  #ifndef EVENT_STREAM_CHIBI_H
  #define EVENT_STREAM_CHIBI_H
  
  #include "cp_file_access_wrapper.h"
  #include "cp_mixer.h"
  #include "cp_player_data.h"
  #include "cp_sample_manager.h"
  #include "cp_song.h"
  #include "io/resource_loader.h"
  #include "os/file_access.h"
  #include "resource.h"
  #include "scene/resources/event_stream.h"
  #include "servers/audio_server.h"
  
  /** SAMPLE MANAGER **/
  
  class CPSampleManagerImpl : public CPSampleManager {
  
  	struct SampleData {
  
  		RID rid;
  		bool stereo;
  		bool is16;
  		int len;
  		int mixfreq;
  		int loop_begin;
  		int loop_end;
  		int locks;
  		DVector<uint8_t> lock;
  		DVector<uint8_t>::Write w;
  		CPSample_Loop_Type loop_type;
  	};
  
  	_FORCE_INLINE_ SampleData *_getsd(CPSample_ID p_id) {
  
  		return ((SampleData *)p_id._private);
  	}
  	Set<SampleData *> valid;
  
  public:
  	_FORCE_INLINE_ RID get_rid(CPSample_ID p_id) { return _getsd(p_id)->rid; }
  	virtual CPSample_ID create(bool p_16bits, bool p_stereo, int32_t p_len);
  	virtual void recreate(CPSample_ID p_id, bool p_16bits, bool p_stereo, int32_t p_len);
  	virtual void destroy(CPSample_ID p_id);
  	virtual bool check(CPSample_ID p_id); // return false if invalid
  
  	virtual void set_c5_freq(CPSample_ID p_id, int32_t p_freq);
  	virtual void set_loop_begin(CPSample_ID p_id, int32_t p_begin);
  	virtual void set_loop_end(CPSample_ID p_id, int32_t p_end);
  	virtual void set_loop_type(CPSample_ID p_id, CPSample_Loop_Type p_type);
  	virtual void set_chunk(CPSample_ID p_id, int32_t p_index, void *p_data, int p_data_len);
  
  	virtual int32_t get_loop_begin(CPSample_ID p_id);
  	virtual int32_t get_loop_end(CPSample_ID p_id);
  	virtual CPSample_Loop_Type get_loop_type(CPSample_ID p_id);
  	virtual int32_t get_c5_freq(CPSample_ID p_id);
  	virtual int32_t get_size(CPSample_ID p_id);
  	virtual bool is_16bits(CPSample_ID p_id);
  	virtual bool is_stereo(CPSample_ID p_id);
  	virtual bool lock_data(CPSample_ID p_id);
  	virtual void *get_data(CPSample_ID p_id); /* WARNING: Not all sample managers
  may be able to implement this, it depends on the mixer in use! */
  	virtual int16_t get_data(CPSample_ID p_id, int p_sample, int p_channel = 0); /// Does not need locking
  	virtual void set_data(CPSample_ID p_id, int p_sample, int16_t p_data, int p_channel = 0); /// Does not need locking
  	virtual void unlock_data(CPSample_ID p_id);
  
  	virtual void get_chunk(CPSample_ID p_id, int32_t p_index, void *p_data, int p_data_len);
  };
  
  /** MIXER **/
  
  class CPMixerImpl : public CPMixer {
  
  	enum {
  		MAX_VOICES = 64
  	};
  
  	struct Voice {
  
  		AudioMixer::ChannelID channel;
  		CPSample_ID sample;
  		float freq_mult;
  		float reverb;
  		Voice() { reverb = 0.0; }
  	};
  
  	Voice voices[MAX_VOICES];
  
  	int callback_interval;
  	int callback_timeout;
  	void (*callback)(void *);
  	void *userdata;
  	float voice_scale;
  	float tempo_scale;
  	float pitch_scale;
  	AudioMixer::ReverbRoomType reverb_type;
  	AudioMixer *mixer;
  
  public:
  	void process_usecs(int p_usec, float p_volume, float p_pitch_scale, float p_tempo_scale);
  
  	/* Callback */
  
  	virtual void set_callback_interval(int p_interval_us); //in usecs, for tracker it's 2500000/tempo
  	virtual void set_callback(void (*p_callback)(void *), void *p_userdata);
  
  	/* Voice Control */
  
  	virtual void setup_voice(int p_voice_index, CPSample_ID p_sample_id, int32_t p_start_index);
  	virtual void stop_voice(int p_voice_index);
  	virtual void set_voice_frequency(int p_voice_index, int32_t p_freq); //in freq*FREQUENCY_BITS
  	virtual void set_voice_panning(int p_voice_index, int p_pan);
  	virtual void set_voice_volume(int p_voice_index, int p_vol);
  	virtual void set_voice_filter(int p_filter, bool p_enabled, uint8_t p_cutoff, uint8_t p_resonance);
  	virtual void set_voice_reverb_send(int p_voice_index, int p_reverb);
  	virtual void set_voice_chorus_send(int p_voice_index, int p_chorus); /* 0 - 255 */
  
  	virtual void set_reverb_mode(ReverbMode p_mode);
  	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);
  
  	/* Info retrieving */
  
  	virtual int32_t get_voice_sample_pos_index(int p_voice_index);
  	virtual int get_voice_panning(int p_voice_index);
  	virtual int get_voice_volume(int p_voice_index);
  	virtual CPSample_ID get_voice_sample_id(int p_voice_index);
  	virtual bool is_voice_active(int p_voice_index);
  	virtual int get_active_voice_count() { return 0; }
  	virtual int get_total_voice_count() { return MAX_VOICES; }
  
  	virtual uint32_t get_mix_frequency() { 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) { return 0; }
  	virtual int32_t *get_mixdown_buffer_ptr() { return NULL; }
  	virtual void set_mix_frequency(int32_t p_mix_frequency){};
  
  	CPMixerImpl(AudioMixer *p_mixer = NULL);
  	virtual ~CPMixerImpl() {}
  };
  
  /** FILE ACCESS **/
  
  class CPFileAccessWrapperImpl : public CPFileAccessWrapper {
  
  	FileAccess *f;
  
  public:
  	virtual Error open(const char *p_filename, int p_mode_flags);
  	virtual void close();
  
  	virtual void seek(uint32_t p_position);
  	virtual void seek_end();
  	virtual uint32_t get_pos();
  
  	virtual bool eof_reached();
  
  	virtual uint8_t get_byte();
  	virtual void get_byte_array(uint8_t *p_dest, int p_elements);
  	virtual void get_word_array(uint16_t *p_dest, int p_elements);
  
  	virtual uint16_t get_word();
  	virtual uint32_t get_dword();
  
  	virtual void set_endian_conversion(bool p_swap);
  	virtual bool is_open();
  
  	virtual Error get_error();
  
  	virtual void store_byte(uint8_t p_dest);
  	virtual void store_byte_array(const uint8_t *p_dest, int p_elements);
  
  	virtual void store_word(uint16_t p_dest);
  	virtual void store_dword(uint32_t p_dest);
  
  	CPFileAccessWrapperImpl() { f = NULL; }
  	virtual ~CPFileAccessWrapperImpl() {
  		if (f) memdelete(f);
  	}
  };
  
  /////////////////////
  
  class EventStreamChibi;
  
  class EventStreamPlaybackChibi : public EventStreamPlayback {
  
  	OBJ_TYPE(EventStreamPlaybackChibi, EventStreamPlayback);
  
  	CPMixerImpl mixer;
  	uint64_t total_usec;
  	Ref<EventStreamChibi> stream;
  	mutable CPPlayer *player;
  	bool loop;
  	int last_order;
  	int loops;
  	virtual Error _play();
  	virtual bool _update(AudioMixer *p_mixer, uint64_t p_usec);
  	virtual void _stop();
  	float volume;
  	float tempo_scale;
  	float pitch_scale;
  
  public:
  	virtual void set_paused(bool p_paused);
  	virtual bool is_paused() const;
  
  	virtual void set_loop(bool p_loop);
  	virtual bool is_loop_enabled() const;
  
  	virtual int get_loop_count() const;
  
  	virtual float get_pos() const;
  	virtual void seek_pos(float p_time);
  
  	virtual void set_volume(float p_vol);
  	virtual float get_volume() const;
  
  	virtual void set_pitch_scale(float p_pitch_scale);
  	virtual float get_pitch_scale() const;
  
  	virtual void set_tempo_scale(float p_tempo_scale);
  	virtual float get_tempo_scale() const;
  
  	virtual void set_channel_volume(int p_channel, float p_volume);
  	virtual float get_channel_volume(int p_channel) const;
  
  	virtual float get_last_note_time(int p_channel) const;
  
  	EventStreamPlaybackChibi(Ref<EventStreamChibi> p_stream = Ref<EventStreamChibi>());
  	~EventStreamPlaybackChibi();
  };
  
  class EventStreamChibi : public EventStream {
  
  	OBJ_TYPE(EventStreamChibi, EventStream);
  
  	friend class ResourceFormatLoaderChibi;
  	friend class EventStreamPlaybackChibi;
  	//I think i didn't know what const was when i wrote this more than a decade ago
  	//so it goes mutable :(
  	mutable CPSong song;
  
  public:
  	virtual Ref<EventStreamPlayback> instance_playback();
  
  	virtual String get_stream_name() const;
  
  	virtual float get_length() const;
  
  	virtual int get_channel_count() const { return 64; } //tracker limit
  
  	EventStreamChibi();
  };
  
  class ResourceFormatLoaderChibi : public ResourceFormatLoader {
  
  public:
  	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
  	virtual void get_recognized_extensions(List<String> *p_extensions) const;
  	virtual bool handles_type(const String &p_type) const;
  	virtual String get_resource_type(const String &p_path) const;
  };
  
  void initialize_chibi();
  void finalize_chibi();
  
  #endif // EVENT_STREAM_CHIBI_H
  