bullet3/examples/TinyAudio/b3AudioListener.cpp

#include "b3AudioListener.h"
#include "b3SoundSource.h"
#include "Bullet3Common/b3Logging.h"
#include "b3WriteWavFile.h"

template <class T>
inline const T& MyMin(const T& a, const T& b) 
{
  return a < b ? a : b ;
}
#define MAX_SOUND_SOURCES 128
#define B3_SAMPLE_RATE 48000

struct b3AudioListenerInternalData
{
	int m_numControlTicks;
	double m_sampleRate;

	b3SoundSource* m_soundSources[MAX_SOUND_SOURCES];

   
	b3WriteWavFile m_wavOut2;
	bool m_writeWavOut;

	b3AudioListenerInternalData()
		:m_numControlTicks(64),
		m_sampleRate(B3_SAMPLE_RATE),
		m_writeWavOut(false)
	{

		for (int i=0;i<MAX_SOUND_SOURCES;i++)
		{
			m_soundSources[i] = 0;
		}
	}
};

b3AudioListener::b3AudioListener()
{
	m_data = new b3AudioListenerInternalData();
	if (m_data->m_writeWavOut)
	{
		m_data->m_wavOut2.setWavFile("bulletAudio2.wav",B3_SAMPLE_RATE,2,false);
	}
}

b3AudioListener::~b3AudioListener()
{
	if (m_data->m_writeWavOut)
	{
		m_data->m_wavOut2.closeWavFile();
	}

	delete m_data;
}

int b3AudioListener::addSoundSource(b3SoundSource* source)
{
	int soundIndex = -1;

	for (int i=0;i<MAX_SOUND_SOURCES;i++)
	{
		if (m_data->m_soundSources[i]==0)
		{
			m_data->m_soundSources[i] = source;
			soundIndex = i;
			break;
		}
	}
	return soundIndex;
}

void b3AudioListener::removeSoundSource(b3SoundSource* source)
{
	for (int i=0;i<MAX_SOUND_SOURCES;i++)
	{
		if (m_data->m_soundSources[i]==source)
		{
			m_data->m_soundSources[i] = 0;
		}
	}
}

b3AudioListenerInternalData* b3AudioListener::getTickData()
{
	return m_data;
}

const b3AudioListenerInternalData* b3AudioListener::getTickData() const
{
	return m_data;
}

double b3AudioListener::getSampleRate() const
{
	return m_data->m_sampleRate;
}

void b3AudioListener::setSampleRate(double sampleRate)
{
	m_data->m_sampleRate = sampleRate;
}


int b3AudioListener::tick(void *outputBuffer,void *inputBuffer1,unsigned int nBufferFrames,
	double streamTime,unsigned int status,void *dataPointer)
{
	B3_PROFILE("b3AudioListener::tick");

	b3AudioListenerInternalData *data = (b3AudioListenerInternalData *)dataPointer;
	register double outs[2],*samples = (double *)outputBuffer;
	register double tempOuts[2];
	int counter,nTicks = (int)nBufferFrames;
	bool done = false;
	
	int numSamples = 0;

	while(nTicks > 0 && !done)
	{
		counter = MyMin(nTicks,data->m_numControlTicks);
		bool newsynth = true;
		if(newsynth) 
		{
			for(int i = 0; i < counter; i++) 
			{
				outs[0] = 0.;
				outs[1] = 0.;
				//make_sound_double(outs,1);
					float numActiveSources = 0;

					for (int i=0;i<MAX_SOUND_SOURCES;i++)
					{
						if (data->m_soundSources[i])
						{
							tempOuts[0] = 0;
							tempOuts[1] = 0;

							if (data->m_soundSources[i]->computeSamples(tempOuts,1, data->m_sampleRate))
							{
								numActiveSources++;
								//simple mixer
								outs[0] += tempOuts[0];
								outs[1] += tempOuts[1];
							}
						}
					}

					//soft-clipping of sounds
					outs[0] = tanh(outs[0]);
					outs[1] = tanh(outs[1]);

				*samples++ = outs[0];
				*samples++ = outs[1];
				numSamples++;
				
			}
			nTicks -= counter;
		}
		if(nTicks == 0) 
			break;
	}

	//logging to wav file
	if (data->m_writeWavOut && numSamples)
	{
		data->m_wavOut2.tick( (double *)outputBuffer,numSamples);
	}
	return 0;
}