1 files changed, 77 insertions, 0 deletions
diff --git a/src/synth_engine.h b/src/synth_engine.h
new file mode 100644
index 0000000..e35e8fb
--- /dev/null
+++ b/src/synth_engine.h
@@ -0,0 +1,77 @@
+#ifndef SYNTH_ENGINE_H
+#define SYNTH_ENGINE_H
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <portaudio.h>
+
+#include "notes.h"
+#include "filter.h"
+
+#define SAMPLE_RATE   (44100)
+//#define SAMPLE_RATE   (48000)
+#define FRAMES_PER_BUFFER  (210)
+
+#define WIDTH 1024
+#define HEIGHT 600
+
+#ifndef M_PI
+#define M_PI  (3.14159265)
+#endif
+
+
+typedef struct {
+  float a;
+  float d;
+  float s;
+  float r;
+  unsigned long long elapsed;
+} adsr_t;
+
+typedef struct {
+  float freq;
+  PaTime noteOn;
+  PaTime noteOff;
+  int key;
+  unsigned long long elapsed;
+} note_t;
+
+typedef struct {
+  int sample_rate_divider;
+} viz_t;
+
+typedef struct {
+  float freq_offset;
+  float gain;
+  float x;
+
+  note_t n;
+  adsr_t adsr;
+
+  int octave;
+
+  int multi;
+  int filter;
+  float cutoff;
+  float resonance;
+  int clamp;
+
+  float (*gen[4]) (float freq, unsigned long long phase, float x, unsigned int sample_rate);
+  int geni;
+
+  BWLowPass* fff;
+
+  viz_t viz;
+} synth_t;
+
+float adsr_amplitude(void *synthData, unsigned long long elapsed);
+float make_sample(unsigned long long phase, void *synthData, unsigned int sample_rate, int viz);
+void init_synth(synth_t * synth);
+int sound_gen(const void *inputBuffer, void *outputBuffer,
+              unsigned long framesPerBuffer,
+              const PaStreamCallbackTimeInfo* timeInfo,
+              PaStreamCallbackFlags statusFlags,
+              void *synthData);
+
+#endif /* SYNTH_ENGINE_H */