godot/servers/audio_server.cpp

/*************************************************************************/
/*  audio_server.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_server.h"
#include "globals.h"
#include "os/os.h"
#include "servers/audio/effects/audio_effect_compressor.h"

AudioDriver *AudioDriver::singleton=NULL;
AudioDriver *AudioDriver::get_singleton() {

	return singleton;
}

void AudioDriver::set_singleton() {

	singleton=this;
}

void AudioDriver::audio_server_process(int p_frames,int32_t *p_buffer,bool p_update_mix_time) {


	if (p_update_mix_time)
		update_mix_time(p_frames);

	if (AudioServer::get_singleton())
		AudioServer::get_singleton()->_driver_process(p_frames,p_buffer);
}



void AudioDriver::update_mix_time(int p_frames) {

	_mix_amount+=p_frames;
	_last_mix_time=OS::get_singleton()->get_ticks_usec();
}

double AudioDriver::get_mix_time() const {

	double total = (OS::get_singleton()->get_ticks_usec() - _last_mix_time) / 1000000.0;
	total+=_mix_amount/(double)get_mix_rate();
	return total;

}


AudioDriver::AudioDriver() {

	_last_mix_time=0;
	_mix_amount=0;
}


AudioDriver *AudioDriverManager::drivers[MAX_DRIVERS];
int AudioDriverManager::driver_count=0;


void AudioDriverManager::add_driver(AudioDriver *p_driver) {

	ERR_FAIL_COND(driver_count>=MAX_DRIVERS);
	drivers[driver_count++]=p_driver;
}

int AudioDriverManager::get_driver_count() {

	return driver_count;
}
AudioDriver *AudioDriverManager::get_driver(int p_driver) {

	ERR_FAIL_INDEX_V(p_driver,driver_count,NULL);
	return drivers[p_driver];
}


//////////////////////////////////////////////
//////////////////////////////////////////////
//////////////////////////////////////////////
//////////////////////////////////////////////

void AudioServer::_driver_process(int p_frames,int32_t* p_buffer) {

	int todo=p_frames;

	while(todo) {

		if (to_mix==0) {
			_mix_step();
		}

		int to_copy = MIN(to_mix,todo);

		Bus *master = buses[0];

		int from = buffer_size-to_mix;
		int from_buf=p_frames-todo;

		//master master, send to output
		int cs = master->channels.size();
		for(int k=0;k<cs;k++) {

			if (master->channels[k].active) {

				AudioFrame *buf = master->channels[k].buffer.ptr();

				for(int j=0;j<to_copy;j++) {

					float l = CLAMP(buf[from+j].l,-1.0,1.0);
					int32_t vl = l*((1<<20)-1);
					p_buffer[(from_buf+j)*(cs*2)+k*2+0]=vl<<11;

					float r = CLAMP(buf[from+j].r,-1.0,1.0);
					int32_t vr = r*((1<<20)-1);
					p_buffer[(from_buf+j)*(cs*2)+k*2+1]=vr<<11;
				}

			} else {
				for(int j=0;j<to_copy;j++) {

					p_buffer[(from_buf+j)*(cs*2)+k*2+0]=0;
					p_buffer[(from_buf+j)*(cs*2)+k*2+1]=0;
				}
			}

		}

		todo-=to_copy;
		to_mix-=to_copy;

	}

}

void AudioServer::_mix_step() {

	for(int i=0;i<buses.size();i++) {
		Bus *bus = buses[i];
		bus->index_cache=i; //might be moved around by editor, so..
		for(int k=0;k<bus->channels.size();k++) {

			bus->channels[k].used=false;
		}
	}

	//make callbacks for mixing the audio
	for (Set<CallbackItem>::Element *E=callbacks.front();E;E=E->next()) {

		E->get().callback(E->get().userdata);
	}

	for(int i=buses.size()-1;i>=0;i--) {
		//go bus by bus
		Bus *bus = buses[i];


		for(int k=0;k<bus->channels.size();k++) {

			if (bus->channels[k].active && !bus->channels[k].used) {
				//buffer was not used, but it's still active, so it must be cleaned
				AudioFrame *buf = bus->channels[k].buffer.ptr();

				for(uint32_t j=0;j<buffer_size;j++) {

					buf[j]=AudioFrame(0,0);
				}
			}

		}


		//process effects
		for(int j=0;j<bus->effects.size();j++) {

			if (!bus->effects[j].enabled)
				continue;

			for(int k=0;k<bus->channels.size();k++) {

				if (!bus->channels[k].active)
					continue;
				bus->channels[k].effect_instances[j]->process(bus->channels[k].buffer.ptr(),temp_buffer[k].ptr(),buffer_size);
			}

			//swap buffers, so internal buffer always has the right data
			for(int k=0;k<bus->channels.size();k++) {

				if (!buses[i]->channels[k].active)
					continue;
				SWAP(bus->channels[k].buffer,temp_buffer[k]);
			}
		}

		//process send

		Bus *send=NULL;

		if (i>0) {
			//everything has a send save for master bus
			if (!bus_map.has(bus->send)) {
				send=buses[0];
			} else {
				send=bus_map[bus->send];
				if (send->index_cache>=bus->index_cache) { //invalid, send to master
					send=buses[0];
				}
			}
		}


		for(int k=0;k<bus->channels.size();k++) {

			if (!bus->channels[k].active)
				continue;

			AudioFrame *buf = bus->channels[k].buffer.ptr();


			AudioFrame peak = AudioFrame(0,0);
			for(uint32_t j=0;j<buffer_size;j++) {
				float l = ABS(buf[j].l);
				if (l>peak.l) {
					peak.l=l;
				}
				float r = ABS(buf[j].r);
				if (r>peak.r) {
					peak.r=r;
				}
			}

			bus->channels[k].peak_volume=AudioFrame(Math::linear2db(peak.l+0.0000000001),Math::linear2db(peak.r+0.0000000001));


			if (!bus->channels[k].used) {
				//see if any audio is contained, because channel was not used


				if (MAX(peak.r,peak.l) > Math::db2linear(channel_disable_treshold_db)) {
					bus->channels[k].last_mix_with_audio=mix_frames;
				} else if (mix_frames-bus->channels[k].last_mix_with_audio > channel_disable_frames ) {
					bus->channels[k].active=false;
					continue; //went inactive, dont mix.
				}
			}

			if (send) {
				//if not master bus, send
				AudioFrame *target_buf = thread_get_channel_mix_buffer(send->index_cache,k);

				for(uint32_t j=0;j<buffer_size;j++) {
					target_buf[j]+=buf[j];
				}
			}

		}

	}


	mix_frames+=buffer_size;
	to_mix=buffer_size;

}

AudioFrame *AudioServer::thread_get_channel_mix_buffer(int p_bus,int p_buffer) {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),NULL);
	ERR_FAIL_INDEX_V(p_buffer,buses[p_bus]->channels.size(),NULL);

	AudioFrame *data = buses[p_bus]->channels[p_buffer].buffer.ptr();


	if (!buses[p_bus]->channels[p_buffer].used) {
		buses[p_bus]->channels[p_buffer].used=true;
		buses[p_bus]->channels[p_buffer].active=true;
		buses[p_bus]->channels[p_buffer].last_mix_with_audio=mix_frames;
		for(uint32_t i=0;i<buffer_size;i++) {
			data[i]=AudioFrame(0,0);
		}
	}

	return data;
}

int AudioServer::thread_get_mix_buffer_size() const {

	return buffer_size;
}

int AudioServer::thread_find_bus_index(const StringName& p_name) {

	if (bus_map.has(p_name)) {
		return bus_map[p_name]->index_cache;
	} else {
		return 0;
	}

}

void AudioServer::set_bus_count(int p_count) {

	ERR_FAIL_COND(p_count<1);
	ERR_FAIL_INDEX(p_count,256);
	lock();
	int cb = buses.size();

	if (p_count<buses.size()) {
		for(int i=p_count;i<buses.size();i++) {
			bus_map.erase(buses[i]->name);
			memdelete(buses[i]);
		}
	}

	buses.resize(p_count);

	for(int i=cb;i<buses.size();i++) {

		String attempt="New Bus";
		int attempts=1;
		while(true) {

			bool name_free=true;
			for(int j=0;j<i;j++) {

				if (buses[j]->name==attempt) {
					name_free=false;
					break;
				}
			}

			if (!name_free) {
				attempts++;
				attempt="New Bus " +itos(attempts);
			} else {
				break;
			}

		}


		buses[i]=memnew(Bus);
		buses[i]->channels.resize(_get_channel_count());
		for(int j=0;j<_get_channel_count();j++) {
			buses[i]->channels[j].buffer.resize(buffer_size);
		}
		buses[i]->name=attempt;
		buses[i]->solo=false;
		buses[i]->mute=false;
		buses[i]->bypass=false;
		buses[i]->volume_db=0;
		if (i>0) {
			buses[i]->send="Master";
		}

		bus_map[attempt]=buses[i];

	}

	unlock();

	emit_signal("bus_layout_changed");
}

int AudioServer::get_bus_count() const {

	return buses.size();
}


void AudioServer::set_bus_name(int p_bus,const String& p_name) {

	ERR_FAIL_INDEX(p_bus,buses.size());
	if (p_bus==0 && p_name!="Master")
		return; //bus 0 is always master
	lock();

	if (buses[p_bus]->name==p_name) {
		unlock();
		return;
	}

	String attempt=p_name;
	int attempts=1;

	while(true) {

		bool name_free=true;
		for(int i=0;i<buses.size();i++) {

			if (buses[i]->name==attempt) {
				name_free=false;
				break;
			}
		}

		if (name_free) {
			break;
		}

		attempts++;
		attempt=p_name+" "+itos(attempts);
	}
	bus_map.erase(buses[p_bus]->name);
	buses[p_bus]->name=attempt;
	bus_map[attempt]=buses[p_bus];
	unlock();

	emit_signal("bus_layout_changed");

}
String AudioServer::get_bus_name(int p_bus) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),String());
	return buses[p_bus]->name;
}

void AudioServer::set_bus_volume_db(int p_bus,float p_volume_db) {

	ERR_FAIL_INDEX(p_bus,buses.size());
	buses[p_bus]->volume_db=p_volume_db;

}
float AudioServer::get_bus_volume_db(int p_bus) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),0);
	return buses[p_bus]->volume_db;

}

void AudioServer::set_bus_send(int p_bus,const StringName& p_send) {

	ERR_FAIL_INDEX(p_bus,buses.size());

	buses[p_bus]->send=p_send;

}

StringName AudioServer::get_bus_send(int p_bus) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),StringName());
	return buses[p_bus]->send;

}


void AudioServer::set_bus_solo(int p_bus,bool p_enable) {

	ERR_FAIL_INDEX(p_bus,buses.size());

	buses[p_bus]->solo=p_enable;

}

bool AudioServer::is_bus_solo(int p_bus) const{

	ERR_FAIL_INDEX_V(p_bus,buses.size(),false);

	return buses[p_bus]->solo;

}

void AudioServer::set_bus_mute(int p_bus,bool p_enable){

	ERR_FAIL_INDEX(p_bus,buses.size());

	buses[p_bus]->mute=p_enable;
}
bool AudioServer::is_bus_mute(int p_bus) const{

	ERR_FAIL_INDEX_V(p_bus,buses.size(),false);

	return buses[p_bus]->mute;

}

void AudioServer::set_bus_bypass_effects(int p_bus,bool p_enable){

	ERR_FAIL_INDEX(p_bus,buses.size());

	buses[p_bus]->bypass=p_enable;
}
bool AudioServer::is_bus_bypassing_effects(int p_bus) const{

	ERR_FAIL_INDEX_V(p_bus,buses.size(),false);

	return buses[p_bus]->bypass;

}


void AudioServer::_update_bus_effects(int p_bus) {

	for(int i=0;i<buses[p_bus]->channels.size();i++) {
		buses[p_bus]->channels[i].effect_instances.resize(buses[p_bus]->effects.size());
		for(int j=0;j<buses[p_bus]->effects.size();j++) {
			Ref<AudioEffectInstance> fx = buses[p_bus]->effects[j].effect->instance();
			if (fx->cast_to<AudioEffectCompressorInstance>()) {
				fx->cast_to<AudioEffectCompressorInstance>()->set_current_channel(i);
			}
			buses[p_bus]->channels[i].effect_instances[j]=fx;

		}
	}
}


void AudioServer::add_bus_effect(int p_bus,const Ref<AudioEffect>& p_effect,int p_at_pos) {

	ERR_FAIL_COND(p_effect.is_null());
	ERR_FAIL_INDEX(p_bus,buses.size());

	lock();

	Bus::Effect fx;
	fx.effect=p_effect;
	//fx.instance=p_effect->instance();
	fx.enabled=true;

	if (p_at_pos>=buses[p_bus]->effects.size() || p_at_pos<0) {
		buses[p_bus]->effects.push_back(fx);
	} else {
		buses[p_bus]->effects.insert(p_at_pos,fx);
	}

	_update_bus_effects(p_bus);

	unlock();
}


void AudioServer::remove_bus_effect(int p_bus,int p_effect) {

	ERR_FAIL_INDEX(p_bus,buses.size());

	lock();

	buses[p_bus]->effects.remove(p_effect);
	_update_bus_effects(p_bus);

	unlock();
}

int AudioServer::get_bus_effect_count(int p_bus) {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),0);

	return buses[p_bus]->effects.size();

}

Ref<AudioEffect> AudioServer::get_bus_effect(int p_bus,int p_effect) {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),Ref<AudioEffect>());
	ERR_FAIL_INDEX_V(p_effect,buses[p_bus]->effects.size(),Ref<AudioEffect>());

	return buses[p_bus]->effects[p_effect].effect;

}

void AudioServer::swap_bus_effects(int p_bus,int p_effect,int p_by_effect) {

	ERR_FAIL_INDEX(p_bus,buses.size());
	ERR_FAIL_INDEX(p_effect,buses[p_bus]->effects.size());
	ERR_FAIL_INDEX(p_by_effect,buses[p_bus]->effects.size());

	lock();
	SWAP( buses[p_bus]->effects[p_effect], buses[p_bus]->effects[p_by_effect] );
	_update_bus_effects(p_bus);
	unlock();
}

void AudioServer::set_bus_effect_enabled(int p_bus,int p_effect,bool p_enabled) {

	ERR_FAIL_INDEX(p_bus,buses.size());
	ERR_FAIL_INDEX(p_effect,buses[p_bus]->effects.size());
	buses[p_bus]->effects[p_effect].enabled=p_enabled;

}
bool AudioServer::is_bus_effect_enabled(int p_bus,int p_effect) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),false);
	ERR_FAIL_INDEX_V(p_effect,buses[p_bus]->effects.size(),false);
	return buses[p_bus]->effects[p_effect].enabled;

}

void AudioServer::move_bus(int p_bus,int p_to_bus) {

	ERR_FAIL_COND(p_bus<1 || p_bus>=buses.size());
	ERR_FAIL_COND(p_bus<1 || p_to_bus>=buses.size());



}

float AudioServer::get_bus_peak_volume_left_db(int p_bus,int p_channel) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),0);
	ERR_FAIL_INDEX_V(p_channel,buses[p_bus]->channels.size(),0);

	return buses[p_bus]->channels[p_channel].peak_volume.l;

}
float AudioServer::get_bus_peak_volume_right_db(int p_bus,int p_channel) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),0);
	ERR_FAIL_INDEX_V(p_channel,buses[p_bus]->channels.size(),0);

	return buses[p_bus]->channels[p_channel].peak_volume.r;

}

bool  AudioServer::is_bus_channel_active(int p_bus,int p_channel) const {

	ERR_FAIL_INDEX_V(p_bus,buses.size(),false);
	ERR_FAIL_INDEX_V(p_channel,buses[p_bus]->channels.size(),false);

	return buses[p_bus]->channels[p_channel].active;

}

void AudioServer::init() {

	channel_disable_treshold_db=GLOBAL_DEF("audio/channel_disable_treshold_db",-60.0);
	channel_disable_frames=float(GLOBAL_DEF("audio/channel_disable_time",2.0))*get_mix_rate();
	buffer_size=1024; //harcoded for now
	switch( get_speaker_mode() ) {
		case SPEAKER_MODE_STEREO: {
			temp_buffer.resize(1);
		} break;
		case SPEAKER_SURROUND_51: {
			temp_buffer.resize(3);
		} break;
		case SPEAKER_SURROUND_71: {
			temp_buffer.resize(4);
		} break;
	}

	for(int i=0;i<temp_buffer.size();i++) {
		temp_buffer[i].resize(buffer_size);
	}

	mix_count=0;
	set_bus_count(1);;
	set_bus_name(0,"Master");


	if (AudioDriver::get_singleton())
		AudioDriver::get_singleton()->start();

}
void AudioServer::finish() {

	for(int i=0;i<buses.size();i++) {
		memdelete(buses[i]);
	}

	buses.clear();
}
void AudioServer::update() {


}

/* MISC config */

void AudioServer::lock() {

	AudioDriver::get_singleton()->lock();
}
void AudioServer::unlock() {

	AudioDriver::get_singleton()->unlock();

}


AudioServer::SpeakerMode AudioServer::get_speaker_mode() const  {

	return (AudioServer::SpeakerMode)AudioDriver::get_singleton()->get_speaker_mode();
}
float AudioServer::get_mix_rate() const {

	return AudioDriver::get_singleton()->get_mix_rate();
}

float AudioServer::read_output_peak_db() const {

	return 0;
}

AudioServer *AudioServer::get_singleton() {

	return singleton;
}

double AudioServer::get_mix_time() const {

	return 0;
}
double AudioServer::get_output_delay() const {

	return 0;
}

AudioServer* AudioServer::singleton=NULL;




void* AudioServer::audio_data_alloc(uint32_t p_data_len,const uint8_t *p_from_data) {

	void * ad = memalloc( p_data_len );
	ERR_FAIL_COND_V(!ad,NULL);
	if (p_from_data) {
		copymem(ad,p_from_data,p_data_len);
	}

	audio_data_lock->lock();
	audio_data[ad]=p_data_len;
	audio_data_total_mem+=p_data_len;
	audio_data_max_mem=MAX(audio_data_total_mem,audio_data_max_mem);
	audio_data_lock->unlock();

	return ad;
}

void AudioServer::audio_data_free(void* p_data) {

	audio_data_lock->lock();
	if (!audio_data.has(p_data)) {
		audio_data_lock->unlock();
		ERR_FAIL();
	}

	audio_data_total_mem-=audio_data[p_data];
	audio_data.erase(p_data);
	memfree(p_data);
	audio_data_lock->unlock();


}

size_t AudioServer::audio_data_get_total_memory_usage() const{

	return audio_data_total_mem;
}
size_t AudioServer::audio_data_get_max_memory_usage() const{

	return audio_data_max_mem;

}

void AudioServer::add_callback(AudioCallback p_callback,void *p_userdata) {
	lock();
	CallbackItem ci;
	ci.callback=p_callback;
	ci.userdata=p_userdata;
	callbacks.insert(ci);
	unlock();
}

void AudioServer::remove_callback(AudioCallback p_callback,void *p_userdata) {

	lock();
	CallbackItem ci;
	ci.callback=p_callback;
	ci.userdata=p_userdata;
	callbacks.erase(ci);
	unlock();

}

void AudioServer::_bind_methods() {


	ClassDB::bind_method(_MD("set_bus_count","amount"),&AudioServer::set_bus_count);
	ClassDB::bind_method(_MD("get_bus_count"),&AudioServer::get_bus_count);

	ClassDB::bind_method(_MD("set_bus_name","bus_idx","name"),&AudioServer::set_bus_name);
	ClassDB::bind_method(_MD("get_bus_name","bus_idx"),&AudioServer::get_bus_name);

	ClassDB::bind_method(_MD("set_bus_volume_db","bus_idx","volume_db"),&AudioServer::set_bus_volume_db);
	ClassDB::bind_method(_MD("get_bus_volume_db","bus_idx"),&AudioServer::get_bus_volume_db);

	ClassDB::bind_method(_MD("set_bus_send","bus_idx","send"),&AudioServer::set_bus_send);
	ClassDB::bind_method(_MD("get_bus_send","bus_idx"),&AudioServer::get_bus_send);

	ClassDB::bind_method(_MD("set_bus_solo","bus_idx","enable"),&AudioServer::set_bus_solo);
	ClassDB::bind_method(_MD("is_bus_solo","bus_idx"),&AudioServer::is_bus_solo);

	ClassDB::bind_method(_MD("set_bus_mute","bus_idx","enable"),&AudioServer::set_bus_mute);
	ClassDB::bind_method(_MD("is_bus_mute","bus_idx"),&AudioServer::is_bus_mute);

	ClassDB::bind_method(_MD("set_bus_bypass_effects","bus_idx","enable"),&AudioServer::set_bus_bypass_effects);
	ClassDB::bind_method(_MD("is_bus_bypassing_effects","bus_idx"),&AudioServer::is_bus_bypassing_effects);

	ClassDB::bind_method(_MD("add_bus_effect","bus_idx","effect:AudioEffect"),&AudioServer::add_bus_effect);
	ClassDB::bind_method(_MD("remove_bus_effect","bus_idx","effect_idx"),&AudioServer::remove_bus_effect);

	ClassDB::bind_method(_MD("get_bus_effect_count","bus_idx"),&AudioServer::add_bus_effect);
	ClassDB::bind_method(_MD("get_bus_effect:AudioEffect","bus_idx","effect_idx"),&AudioServer::get_bus_effect);
	ClassDB::bind_method(_MD("swap_bus_effects","bus_idx","effect_idx","by_effect_idx"),&AudioServer::swap_bus_effects);

	ClassDB::bind_method(_MD("set_bus_effect_enabled","bus_idx","effect_idx","enabled"),&AudioServer::set_bus_effect_enabled);
	ClassDB::bind_method(_MD("is_bus_effect_enabled","bus_idx","effect_idx"),&AudioServer::is_bus_effect_enabled);

	ClassDB::bind_method(_MD("get_bus_peak_volume_left_db","bus_idx","channel"),&AudioServer::get_bus_peak_volume_left_db);
	ClassDB::bind_method(_MD("get_bus_peak_volume_right_db","bus_idx","channel"),&AudioServer::get_bus_peak_volume_right_db);

	ClassDB::bind_method(_MD("lock"),&AudioServer::lock);
	ClassDB::bind_method(_MD("unlock"),&AudioServer::unlock);

	ClassDB::bind_method(_MD("get_speaker_mode"),&AudioServer::get_speaker_mode);
	ClassDB::bind_method(_MD("get_mix_rate"),&AudioServer::get_mix_rate);

	ADD_SIGNAL(MethodInfo("bus_layout_changed") );
}

AudioServer::AudioServer() {

	singleton=this;
	audio_data_total_mem=0;
	audio_data_max_mem=0;
	audio_data_lock=Mutex::create();
	mix_frames=0;
	to_mix=0;

}

AudioServer::~AudioServer() {

	memdelete(audio_data_lock);
}