synth: Implement CC: All Notes Off & All Sounds Off

Author: AnClark

plugin/MinatonProcess.cpp

@@ -170,7 +170,19 @@ void MinatonPlugin::_processMidi(const uint8_t* data, const uint32_t size)
         }
         // control change. `key` is control's ID (CC ID).
         else if (status == 0xb0) {
-            d_stderr2("[Unimplemented] Control change: CC#%d", key);
+            if (key == 0x78) { // Process All Notes Off (0x78)
+                d_stderr("[MIDI] All Notes Off");
+                fSynthesizer->panic();
+
+                last_note = -1;
+            } else if (key == 0x7b) { // Process All Sounds Off (0x7b)
+                d_stderr("[MIDI] All Sounds Off");
+                fSynthesizer->panic();
+
+                last_note = -1;
+            } else {
+                d_stderr2("[Unimplemented] Control change: CC#%d", key);
+            }
         }
         // pitch bend
         else if (status == 0xe0) {

src/synth_dpf.cpp

@@ -115,6 +115,19 @@ int minaton_synth_dpf::add_wave(string name, const unsigned char* data, size_t s
     return number_of_waves - 1;
 }
 
+void minaton_synth_dpf::panic()
+{
+    // Setting state to "dormant" can immediately turn all sounds off.
+    //
+    // "dormant" is the state when envelope ceases.
+    // See minaton_synth::dca_update(): part `if (envelope1.state == release)`.
+
+    envelope1.state = dormant;
+    envelope1.level = 0;
+    envelope2.state = dormant;
+    envelope2.level = 0;
+}
+
 //=========================================================
 //-- Accessor for embedded waves
 //=========================================================

src/synth_dpf.hpp

@@ -37,6 +37,8 @@ class minaton_synth_dpf : public minaton_synth {
     void init();
     int add_wave(string, const unsigned char*, size_t size);
 
+    void panic();
+
 private:
     Memory m_memory;
 };