text: /*************************************************************************/
  /*  audio_driver_dummy.cpp                                               */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
  /*                                                                       */
  /* 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_driver_dummy.h"
  
  #include "os/os.h"
  #include "project_settings.h"
  
  Error AudioDriverDummy::init() {
  
  	active = false;
  	thread_exited = false;
  	exit_thread = false;
  	samples_in = NULL;
  
  	mix_rate = DEFAULT_MIX_RATE;
  	speaker_mode = SPEAKER_MODE_STEREO;
  	channels = 2;
  
  	int latency = GLOBAL_DEF_RST("audio/output_latency", DEFAULT_OUTPUT_LATENCY);
  	buffer_frames = closest_power_of_2(latency * mix_rate / 1000);
  
  	samples_in = memnew_arr(int32_t, buffer_frames * channels);
  
  	mutex = Mutex::create();
  	thread = Thread::create(AudioDriverDummy::thread_func, this);
  
  	return OK;
  };
  
  void AudioDriverDummy::thread_func(void *p_udata) {
  
  	AudioDriverDummy *ad = (AudioDriverDummy *)p_udata;
  
  	uint64_t usdelay = (ad->buffer_frames / float(ad->mix_rate)) * 1000000;
  
  	while (!ad->exit_thread) {
  
  		if (ad->active) {
  
  			ad->lock();
  
  			ad->audio_server_process(ad->buffer_frames, ad->samples_in);
  
  			ad->unlock();
  		};
  
  		OS::get_singleton()->delay_usec(usdelay);
  	};
  
  	ad->thread_exited = true;
  };
  
  void AudioDriverDummy::start() {
  
  	active = true;
  };
  
  int AudioDriverDummy::get_mix_rate() const {
  
  	return mix_rate;
  };
  
  AudioDriver::SpeakerMode AudioDriverDummy::get_speaker_mode() const {
  
  	return speaker_mode;
  };
  
  void AudioDriverDummy::lock() {
  
  	if (!thread || !mutex)
  		return;
  	mutex->lock();
  };
  
  void AudioDriverDummy::unlock() {
  
  	if (!thread || !mutex)
  		return;
  	mutex->unlock();
  };
  
  void AudioDriverDummy::finish() {
  
  	if (!thread)
  		return;
  
  	exit_thread = true;
  	Thread::wait_to_finish(thread);
  
  	if (samples_in) {
  		memdelete_arr(samples_in);
  	};
  
  	memdelete(thread);
  	if (mutex)
  		memdelete(mutex);
  	thread = NULL;
  };
  
  AudioDriverDummy::AudioDriverDummy() {
  
  	mutex = NULL;
  	thread = NULL;
  };
  
  AudioDriverDummy::~AudioDriverDummy(){
  
  };
  