create basic audio, towards sound sensors etc.

examples/TinyAudio/b3SoundSource.cpp

@@ -0,0 +1,66 @@
+#include "b3SoundSource.h"
+
+#define MY2PI (2.*3.14159265)
+#include <math.h>
+
+struct b3SoundOscillator
+{
+	int m_type;
+	double m_amplitude;
+	double m_phase;
+	double m_frequency;
+
+	double sampleWaveForm(double sampleRate)
+	{
+		while (m_phase >= MY2PI)
+			m_phase -= MY2PI;
+
+		double z = sinf(m_phase);
+		double sample = m_amplitude*z;
+
+		m_phase += MY2PI * (1./sampleRate) * m_frequency;
+		return sample;
+	}
+
+	b3SoundOscillator()
+		:m_phase(0),
+		m_amplitude(0.8),
+		m_frequency(442.)
+	{
+
+	}
+};
+
+struct b3SoundSourceInternalData
+{
+	b3SoundOscillator m_oscillator;
+};
+
+b3SoundSource::b3SoundSource()
+{
+	m_data = new b3SoundSourceInternalData();
+}
+
+b3SoundSource::~b3SoundSource()
+{
+	delete m_data;
+}
+
+bool b3SoundSource::computeSamples(double* sampleBuffer, int numSamples, double sampleRate)
+{
+	double* outputSamples = sampleBuffer;
+
+	for (int i=0;i<numSamples;i++)
+	{
+		double sample = m_data->m_oscillator.sampleWaveForm(sampleRate);
+		double sampleLeft = sample;
+		double sampleRight = sample;
+
+		*outputSamples++ = sampleLeft;
+		*outputSamples++ = sampleRight;
+
+	}
+
+	return true;
+//	return false;
+}