1 files changed, 15 insertions, 0 deletions
diff --git a/src/adsr.h b/src/adsr.h
new file mode 100644
index 0000000..713c95f
--- /dev/null
+++ b/src/adsr.h
@@ -0,0 +1,15 @@
+#ifndef ADSR_H
+#define ADSR_H
+
+typedef struct adsr_t {
+  float a;
+  float peak;
+  float d;
+  float s;
+  float r;
+  unsigned long long elapsed;
+} adsr_t;
+
+float adsr_amplitude(adsr_t *adsr, float noteOn, float noteOff, unsigned long long elapsed);
+
+#endif /* ADSR_H */