Initial commit - basic sine generator

src/SineSynth.cpp

@@ -0,0 +1,28 @@
+#include "SineSynth.h"
+
+#include <iostream>
+
+Generator::Generator(uint32_t _sampleRate, float _frequency, float _amplitude) : sampleRate(_sampleRate), frequency(_frequency), amplitude(_amplitude)
+{
+}
+
+Generator::~Generator()
+{
+}
+
+SineGenerator::SineGenerator(uint32_t _sampleRate, float _frequency, float _amplitude = 1) : Generator(_sampleRate, _frequency, _amplitude), tick(0) {
+    phaseIncr = 2 * M_PI * frequency / sampleRate;
+
+    std::cout << "Constructed SineGenerator with freq " << frequency << " phaseIncr " << phaseIncr << std::endl;
+}
+
+SineGenerator::~SineGenerator() {
+
+}
+
+void SineGenerator::getSamples(uint16_t nSamples, float *buf) {
+    for (;nSamples>0;nSamples--) {
+        std::cout << "Generating tick " << tick << std::endl;
+        *buf++ = cos(phaseIncr * tick++) * amplitude;
+    }
+}

src/main.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <pulse/simple.h>
+
+#include "SineSynth.h"
+
+int main(int argc, char *argv[]) {
+    SineGenerator sg(44100, 440.0f, 0.1);
+    static const pa_sample_spec ss = {
+        .format = PA_SAMPLE_FLOAT32,
+        .rate = 44100,
+        .channels = 1
+    };
+
+    pa_simple *s = NULL;
+    int error;
+    s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &error);
+
+    float buf[1024];
+    for (;;) {
+        sg.getSamples(1024, buf);
+        pa_simple_write(s, buf, sizeof(buf), &error);
+    }
+}