/*************************************************************************/
/*  audio_stream_ogg_vorbis.h                                            */
/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#ifndef AUDIO_STREAM_OGG_VORBIS_H
#define AUDIO_STREAM_OGG_VORBIS_H

#include "core/io/resource_loader.h"
#include "core/os/file_access.h"
#include "core/os/thread_safe.h"
#include "scene/resources/audio_stream.h"

#include <vorbis/vorbisfile.h>

class AudioStreamPlaybackOGGVorbis : public AudioStreamPlayback {

	GDCLASS(AudioStreamPlaybackOGGVorbis, AudioStreamPlayback);

	enum {
		MIN_MIX = 1024
	};

	FileAccess *f;

	ov_callbacks _ov_callbacks;
	float length;
	static size_t _ov_read_func(void *p_dst, size_t p_data, size_t p_count, void *_f);
	static int _ov_seek_func(void *_f, ogg_int64_t offs, int whence);
	static int _ov_close_func(void *_f);
	static long _ov_tell_func(void *_f);

	String file;
	int64_t frames_mixed;

	bool stream_loaded;
	volatile bool playing;
	OggVorbis_File vf;
	int stream_channels;
	int stream_srate;
	int current_section;

	bool paused;
	bool loops;
	int repeats;

	Error _load_stream();
	void _clear_stream();
	void _close_file();

	bool stream_valid;
	float loop_restart_time;

public:
	Error set_file(const String &p_file);

	virtual void play(float p_from = 0);
	virtual void stop();
	virtual bool is_playing() const;

	virtual void set_loop_restart_time(float p_time) { loop_restart_time = p_time; }

	virtual void set_paused(bool p_paused);
	virtual bool is_paused() const;

	virtual void set_loop(bool p_enable);
	virtual bool has_loop() const;

	virtual float get_length() const;

	virtual String get_stream_name() const;

	virtual int get_loop_count() const;

	virtual float get_playback_position() const;
	virtual void seek(float p_time);

	virtual int get_channels() const { return stream_channels; }
	virtual int get_mix_rate() const { return stream_srate; }

	virtual int get_minimum_buffer_size() const { return 0; }
	virtual int mix(int16_t *p_buffer, int p_frames);

	AudioStreamPlaybackOGGVorbis();
	~AudioStreamPlaybackOGGVorbis();
};

class AudioStreamOGGVorbis : public AudioStream {

	GDCLASS(AudioStreamOGGVorbis, AudioStream);

	String file;

public:
	Ref<AudioStreamPlayback> instance_playback() {
		Ref<AudioStreamPlaybackOGGVorbis> pb = memnew(AudioStreamPlaybackOGGVorbis);
		pb->set_file(file);
		return pb;
	}

	void set_file(const String &p_file) { file = p_file; }
};

class ResourceFormatLoaderAudioStreamOGGVorbis : public ResourceFormatLoader {
public:
	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL, bool p_use_sub_threads = false, float *r_progress = nullptr);
	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;
};

#endif // AUDIO_STREAM_OGG_H