create basic audio, towards sound sensors etc.

examples/TinyAudio/b3AudioListener.cpp

@@ -0,0 +1,132 @@
+#include "b3AudioListener.h"
+#include "b3SoundSource.h"
+
+template <class T>
+inline const T& MyMin(const T& a, const T& b) 
+{
+  return a < b ? a : b ;
+}
+#define MAX_SOUND_SOURCES 128
+
+struct b3AudioListenerInternalData
+{
+	int m_numControlTicks;
+	double m_sampleRate;
+
+	b3SoundSource* m_soundSources[MAX_SOUND_SOURCES];
+
+	b3AudioListenerInternalData()
+		:m_numControlTicks(64),
+		m_sampleRate(48000)
+	{
+		for (int i=0;i<MAX_SOUND_SOURCES;i++)
+		{
+			m_soundSources[i] = 0;
+		}
+	}
+};
+
+b3AudioListener::b3AudioListener()
+{
+	m_data = new b3AudioListenerInternalData();
+}
+
+b3AudioListener::~b3AudioListener()
+{
+	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(int soundSourceIndex)
+{
+	if (soundSourceIndex >=0 && soundSourceIndex<MAX_SOUND_SOURCES)
+	{
+		m_data->m_soundSources[soundSourceIndex] = 0;
+	}
+}
+
+b3AudioListenerInternalData* b3AudioListener::getTickData()
+{
+	return m_data;
+}
+
+const b3AudioListenerInternalData* b3AudioListener::getTickData() const
+{
+	return m_data;
+}
+
+double b3AudioListener::getSampleRate() const
+{
+	return m_data->m_sampleRate;
+}
+
+
+
+int b3AudioListener::tick(void *outputBuffer,void *inputBuffer1,unsigned int nBufferFrames,
+	double streamTime,unsigned int status,void *dataPointer)
+{
+	b3AudioListenerInternalData *data = (b3AudioListenerInternalData *)dataPointer;
+	register double outs[2],*samples = (double *)outputBuffer;
+	register double tempOuts[2];
+	int counter,nTicks = (int)nBufferFrames;
+	bool done = false;
+
+	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])
+						{
+							if (data->m_soundSources[i]->computeSamples(tempOuts,1, data->m_sampleRate))
+							{
+								numActiveSources++;
+								//simple mixer
+								outs[0] += tempOuts[0];
+								outs[1] += tempOuts[1];
+							}
+						}
+					}
+
+					//simple mixer
+					if (numActiveSources)
+					{
+						outs[0] *= 1./numActiveSources;
+						outs[1] *= 1./numActiveSources;
+					}
+		
+				*samples++ = outs[0];
+				*samples++ = outs[1];
+			}
+			nTicks -= counter;
+		}
+		if(nTicks == 0) 
+			break;
+	}
+	return 0;
+}