text: /*
   * Copyright (c) 2013, Mathias Hällman. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "audio/AudioDevice.h"
  
  void AudioDevice::CalculateStreamBufferNumAndSize(
  	AudioSamplingRate samplingRate,
  	AudioSampleFormat sampleFormat,
  	size_t numChannels,
  	size_t& numBuffers,
  	size_t& bufferSize)
  {
  	const size_t samplesPerSecondPerChannel = samplingRate;
  	const size_t samplesPerSecond = samplesPerSecondPerChannel * numChannels;
  	const size_t bytesPerSample = sampleFormat;
  	const size_t bytesPerSecond = samplesPerSecond * bytesPerSample;
  
  	const size_t minimumFPS = 10;
  	const float totBufferLengthInSeconds = 1.0f / minimumFPS;
  	const size_t totBufferSize = totBufferLengthInSeconds * bytesPerSecond;
  	const float minBufferLengthInSeconds = 0.05f;
  	const size_t minBufferSize = minBufferLengthInSeconds * bytesPerSecond;
  
  	bufferSize = 2;
  	while (bufferSize < minBufferSize)
  	{
  		bufferSize *= 2;
  	}
  	numBuffers = totBufferSize / bufferSize + 1;
  	numBuffers = numBuffers < 2 ? 2 : numBuffers;
  }
  