/*************************************************************************/
/*  audio_stream_opus.h                                                  */
/*************************************************************************/
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#ifndef AUDIO_STREAM_OPUS_H
#define AUDIO_STREAM_OPUS_H

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

#include <opus/opusfile.h>

/**
	@author George Marques <george@gmarqu.es>
*/

class AudioStreamPlaybackOpus : public AudioStreamPlayback {

	GDCLASS(AudioStreamPlaybackOpus, AudioStreamPlayback)

	enum {
		MIN_MIX = 1024
	};

	FileAccess *f;

	OpusFileCallbacks _op_callbacks;
	float length;
	static int _op_read_func(void *_stream, unsigned char *_ptr, int _nbytes);
	static int _op_seek_func(void *_stream, opus_int64 _offset, int _whence);
	static int _op_close_func(void *_stream);
	static opus_int64 _op_tell_func(void *_stream);
	static const float osrate;

	String file;
	int64_t frames_mixed;

	bool stream_loaded;
	volatile bool playing;
	OggOpusFile *opus_file;
	int stream_channels;
	int current_section;
	int pre_skip;

	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 { return playing; }

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

	virtual void set_paused(bool p_paused) { paused = p_paused; }
	virtual bool is_paused() const { return paused; }

	virtual void set_loop(bool p_enable) { loops = p_enable; }
	virtual bool has_loop() const { return loops; }

	virtual float get_length() const;

	virtual String get_stream_name() const { return ""; }

	virtual int get_loop_count() const { return repeats; }

	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 osrate; }

	virtual int get_minimum_buffer_size() const;

	virtual int mix(int16_t *p_buffer, int p_frames);

	AudioStreamPlaybackOpus();
	~AudioStreamPlaybackOpus();
};

class AudioStreamOpus : public AudioStream {

	GDCLASS(AudioStreamOpus, AudioStream)

	String file;

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

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

class ResourceFormatLoaderAudioStreamOpus : public ResourceFormatLoader {
	GDCLASS(ResourceFormatLoaderAudioStreamOpus, 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;
};

#endif // AUDIO_STREAM_OPUS_H