text: /*************************************************************************/
  /*  video_stream_theora.h                                                */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 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 VIDEO_STREAM_THEORA_H
  #define VIDEO_STREAM_THEORA_H
  
  #include "core/io/resource_loader.h"
  #include "core/os/file_access.h"
  #include "core/os/semaphore.h"
  #include "core/os/thread.h"
  #include "core/ring_buffer.h"
  #include "scene/resources/video_stream.h"
  #include "servers/audio_server.h"
  
  #include <theora/theoradec.h>
  #include <vorbis/codec.h>
  
  //#define THEORA_USE_THREAD_STREAMING
  
  class VideoStreamPlaybackTheora : public VideoStreamPlayback {
  
  	GDCLASS(VideoStreamPlaybackTheora, VideoStreamPlayback);
  
  	enum {
  		MAX_FRAMES = 4,
  	};
  
  	//Image frames[MAX_FRAMES];
  	Image::Format format;
  	Vector<uint8_t> frame_data;
  	int frames_pending;
  	FileAccess *file;
  	String file_name;
  	int audio_frames_wrote;
  	Point2i size;
  
  	int buffer_data();
  	int queue_page(ogg_page *page);
  	void video_write(void);
  	float get_time() const;
  
  	bool theora_eos;
  	bool vorbis_eos;
  
  	ogg_sync_state oy;
  	ogg_page og;
  	ogg_stream_state vo;
  	ogg_stream_state to;
  	th_info ti;
  	th_comment tc;
  	th_dec_ctx *td;
  	vorbis_info vi;
  	vorbis_dsp_state vd;
  	vorbis_block vb;
  	vorbis_comment vc;
  	th_pixel_fmt px_fmt;
  	double videobuf_time;
  	int pp_inc;
  
  	int theora_p;
  	int vorbis_p;
  	int pp_level_max;
  	int pp_level;
  	int videobuf_ready;
  
  	bool playing;
  	bool buffering;
  
  	double last_update_time;
  	double time;
  	double delay_compensation;
  
  	Ref<ImageTexture> texture;
  
  	AudioMixCallback mix_callback;
  	void *mix_udata;
  	bool paused;
  
  #ifdef THEORA_USE_THREAD_STREAMING
  
  	enum {
  		RB_SIZE_KB = 1024
  	};
  
  	RingBuffer<uint8_t> ring_buffer;
  	Vector<uint8_t> read_buffer;
  	bool thread_eof;
  	Semaphore *thread_sem;
  	Thread *thread;
  	volatile bool thread_exit;
  
  	static void _streaming_thread(void *ud);
  
  #endif
  
  	int audio_track;
  
  protected:
  	void clear();
  
  public:
  	virtual void play();
  	virtual void stop();
  	virtual bool is_playing() const;
  
  	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);
  
  	void set_file(const String &p_file);
  
  	virtual Ref<Texture2D> get_texture() const;
  	virtual void update(float p_delta);
  
  	virtual void set_mix_callback(AudioMixCallback p_callback, void *p_userdata);
  	virtual int get_channels() const;
  	virtual int get_mix_rate() const;
  
  	virtual void set_audio_track(int p_idx);
  
  	VideoStreamPlaybackTheora();
  	~VideoStreamPlaybackTheora();
  };
  
  class VideoStreamTheora : public VideoStream {
  
  	GDCLASS(VideoStreamTheora, VideoStream);
  
  	String file;
  	int audio_track;
  
  protected:
  	static void _bind_methods();
  
  public:
  	Ref<VideoStreamPlayback> instance_playback() {
  		Ref<VideoStreamPlaybackTheora> pb = memnew(VideoStreamPlaybackTheora);
  		pb->set_audio_track(audio_track);
  		pb->set_file(file);
  		return pb;
  	}
  
  	void set_file(const String &p_file) { file = p_file; }
  	String get_file() { return file; }
  	void set_audio_track(int p_track) { audio_track = p_track; }
  
  	VideoStreamTheora() { audio_track = 0; }
  };
  
  class ResourceFormatLoaderTheora : public ResourceFormatLoader {
  public:
  	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = nullptr, 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
  