/*************************************************************************/
/*  audio_stream_ogg_vorbis.cpp                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* 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,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "audio_stream_ogg_vorbis.h"



size_t AudioStreamPlaybackOGGVorbis::_ov_read_func(void *p_dst,size_t p_data, size_t p_count, void *_f) {

	//printf("read to %p, %i bytes, %i nmemb, %p\n",p_dst,p_data,p_count,_f);
	FileAccess *fa=(FileAccess*)_f;
	size_t read_total = p_data*p_count;

	if (fa->eof_reached())
		return 0;

	uint8_t *dst=(uint8_t*)p_dst;

	int read = fa->get_buffer(dst, read_total);

	return read;
}

int AudioStreamPlaybackOGGVorbis::_ov_seek_func(void *_f,ogg_int64_t offs, int whence) {

	//printf("seek to %p, offs %i, whence %i\n",_f,(int)offs,whence);

#ifdef SEEK_SET
	//printf("seek set defined\n");
	FileAccess *fa=(FileAccess*)_f;

	if (whence==SEEK_SET) {

		fa->seek(offs);
	} else if (whence==SEEK_CUR) {

		fa->seek(fa->get_pos()+offs);
	} else if (whence==SEEK_END) {

		fa->seek_end(offs);
	} else {

		ERR_PRINT("BUG, wtf was whence set to?\n");
	}
	int ret=fa->eof_reached()?-1:0;
	//printf("returning %i\n",ret);
	return ret;

#else
	return -1; // no seeking
#endif

}
int AudioStreamPlaybackOGGVorbis::_ov_close_func(void *_f) {

	//printf("close %p\n",_f);
	if (!_f)
		return 0;
	FileAccess *fa=(FileAccess*)_f;
	if (fa->is_open())
		fa->close();
	return 0;
}
long AudioStreamPlaybackOGGVorbis::_ov_tell_func(void *_f) {

	//printf("close %p\n",_f);

	FileAccess *fa=(FileAccess*)_f;
	return fa->get_pos();
}



int AudioStreamPlaybackOGGVorbis::mix(int16_t* p_bufer,int p_frames) {

	if (!playing)
		return 0;

	int total=p_frames;
	while (true) {

		int todo = p_frames;

		if (todo==0 || todo<MIN_MIX) {
			break;
		}

		//printf("to mix %i - mix me %i bytes\n",to_mix,to_mix*stream_channels*sizeof(int16_t));

		#ifdef BIG_ENDIAN_ENABLED
		long ret=ov_read(&vf,(char*)p_bufer,todo*stream_channels*sizeof(int16_t), 1, 2, 1, &current_section);
		#else
		long ret=ov_read(&vf,(char*)p_bufer,todo*stream_channels*sizeof(int16_t), 0, 2, 1, &current_section);
		#endif

		if (ret<0) {

			playing = false;
			ERR_EXPLAIN("Error reading OGG Vorbis File: "+file);
			ERR_BREAK(ret<0);
		} else if (ret==0) { // end of song, reload?

			ov_clear(&vf);

			_close_file();

			if (!has_loop()) {

				playing=false;
				repeats=1;
				break;
			}

			f=FileAccess::open(file,FileAccess::READ);

			int errv = ov_open_callbacks(f,&vf,NULL,0,_ov_callbacks);
			if (errv!=0) {
				playing=false;
				break; // :(
			}

			if (loop_restart_time) {
				bool ok = ov_time_seek(&vf,loop_restart_time)==0;
				if (!ok) {
					playing=false;
					//ERR_EXPLAIN("loop restart time rejected");
					ERR_PRINT("loop restart time rejected")
				}

				frames_mixed=stream_srate*loop_restart_time;
			} else {

				frames_mixed=0;
			}
			repeats++;
			continue;

		}

		ret/=stream_channels;
		ret/=sizeof(int16_t);

		frames_mixed+=ret;

		p_bufer+=ret*stream_channels;
		p_frames-=ret;

	}

	return total-p_frames;

}



void AudioStreamPlaybackOGGVorbis::play(float p_from) {

	if (playing)
		stop();

	if (_load_stream()!=OK)
		return;


	frames_mixed=0;
	playing=true;
	if (p_from>0) {
		seek_pos(p_from);
	}
}

void AudioStreamPlaybackOGGVorbis::_close_file() {

	if (f) {

		memdelete(f);
		f=NULL;
	}
}

bool AudioStreamPlaybackOGGVorbis::is_playing() const {
	return playing;
}
void AudioStreamPlaybackOGGVorbis::stop() {

	_clear_stream();
	playing=false;
	//_clear();
}



float AudioStreamPlaybackOGGVorbis::get_pos() const {

	int32_t frames = int32_t(frames_mixed);
	if (frames < 0)
		frames=0;
	return double(frames) / stream_srate;
}

void AudioStreamPlaybackOGGVorbis::seek_pos(float p_time) {



	if (!playing)
		return;
	bool ok = ov_time_seek(&vf,p_time)==0;
	ERR_FAIL_COND(!ok);
	frames_mixed=stream_srate*p_time;
}

String AudioStreamPlaybackOGGVorbis::get_stream_name() const  {

	return "";
}

void AudioStreamPlaybackOGGVorbis::set_loop(bool p_enable) {

	loops=p_enable;
}

bool AudioStreamPlaybackOGGVorbis::has_loop() const {

	return loops;
}

int AudioStreamPlaybackOGGVorbis::get_loop_count() const {
	return repeats;
}


Error AudioStreamPlaybackOGGVorbis::set_file(const String& p_file) {

	file=p_file;
	stream_valid=false;
	Error err;
	f=FileAccess::open(file,FileAccess::READ,&err);

	if (err) {
		ERR_FAIL_COND_V( err, err );
	}

	int errv = ov_open_callbacks(f,&vf,NULL,0,_ov_callbacks);
	switch(errv) {

		case OV_EREAD: { // - A read from media returned an error.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_CANT_READ );
		} break;
		case OV_EVERSION:  // - Vorbis version mismatch.
		case OV_ENOTVORBIS: { // - Bitstream is not Vorbis data.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_UNRECOGNIZED );
		} break;
		case OV_EBADHEADER: { // - Invalid Vorbis bitstream header.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_CORRUPT );
		} break;
		case OV_EFAULT: { // - Internal logic fault; indicates a bug or heap/stack corruption.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_BUG );
		} break;
	}
	const vorbis_info *vinfo=ov_info(&vf,-1);
	stream_channels=vinfo->channels;
	stream_srate=vinfo->rate;
	length = ov_time_total(&vf,-1);
	ov_clear(&vf);
	memdelete(f);
	f=NULL;
	stream_valid=true;


	return OK;
}

Error AudioStreamPlaybackOGGVorbis::_load_stream()  {

	ERR_FAIL_COND_V(!stream_valid,ERR_UNCONFIGURED);

	_clear_stream();
	if (file=="")
		return ERR_INVALID_DATA;

	Error err;
	f=FileAccess::open(file,FileAccess::READ,&err);
	if (err) {
		ERR_FAIL_COND_V( err, err );
	}

	int errv = ov_open_callbacks(f,&vf,NULL,0,_ov_callbacks);
	switch(errv) {

		case OV_EREAD: { // - A read from media returned an error.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_CANT_READ );
		} break;
		case OV_EVERSION:  // - Vorbis version mismatch.
		case OV_ENOTVORBIS: { // - Bitstream is not Vorbis data.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_UNRECOGNIZED );
		} break;
		case OV_EBADHEADER: { // - Invalid Vorbis bitstream header.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_FILE_CORRUPT );
		} break;
		case OV_EFAULT: { // - Internal logic fault; indicates a bug or heap/stack corruption.
			memdelete(f); f=NULL;
			ERR_FAIL_V( ERR_BUG );
		} break;
	}
	repeats=0;
	stream_loaded=true;


	return OK;
}


float AudioStreamPlaybackOGGVorbis::get_length() const {

	if (!stream_loaded) {
		if (const_cast<AudioStreamPlaybackOGGVorbis*>(this)->_load_stream()!=OK)
			return 0;
	}
	return length;
}

void AudioStreamPlaybackOGGVorbis::_clear_stream() {

	if (!stream_loaded)
		return;

	ov_clear(&vf);
	_close_file();

	stream_loaded=false;
	//stream_channels=1;
	playing=false;
}

void AudioStreamPlaybackOGGVorbis::set_paused(bool p_paused) {

	paused=p_paused;
}

bool AudioStreamPlaybackOGGVorbis::is_paused(bool p_paused) const {

	return paused;
}


AudioStreamPlaybackOGGVorbis::AudioStreamPlaybackOGGVorbis() {

	loops=false;
	playing=false;
	_ov_callbacks.read_func=_ov_read_func;
	_ov_callbacks.seek_func=_ov_seek_func;
	_ov_callbacks.close_func=_ov_close_func;
	_ov_callbacks.tell_func=_ov_tell_func;
	f = NULL;
	stream_loaded=false;
	stream_valid=false;
	repeats=0;	
	paused=true;
	stream_channels=0;
	stream_srate=0;
	current_section=0;
	length=0;
	loop_restart_time=0;
}


AudioStreamPlaybackOGGVorbis::~AudioStreamPlaybackOGGVorbis() {

	_clear_stream();

}



RES ResourceFormatLoaderAudioStreamOGGVorbis::load(const String &p_path, const String& p_original_path, Error *r_error) {
	if (r_error)
		*r_error=OK;

	AudioStreamOGGVorbis *ogg_stream = memnew(AudioStreamOGGVorbis);
	ogg_stream->set_file(p_path);
	return Ref<AudioStreamOGGVorbis>(ogg_stream);
}

void ResourceFormatLoaderAudioStreamOGGVorbis::get_recognized_extensions(List<String> *p_extensions) const {

	p_extensions->push_back("ogg");
}
String ResourceFormatLoaderAudioStreamOGGVorbis::get_resource_type(const String &p_path) const {

	if (p_path.get_extension().to_lower()=="ogg")
		return "AudioStreamOGGVorbis";
	return "";
}

bool ResourceFormatLoaderAudioStreamOGGVorbis::handles_type(const String& p_type) const {
	return (p_type=="AudioStream" || p_type=="AudioStreamOGG" || p_type=="AudioStreamOGGVorbis");
}