zynaddsubfx

commit 8785eafa7d124d1014392215b6f201bcfe6b87f9
parent bd4c2a6488f5f81b5e05a021ae7fe859406a067b
Author: Hans Petter Selasky <hps@selasky.org>
Date:   Tue, 22 Jan 2019 16:01:02 +0100

Implement support for MIDI floating point note event via SysEx.

Signed-off-by: Hans Petter Selasky <hps@selasky.org>

Diffstat:
M
src/Nio/MidiIn.cpp
 | 
57
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
src/Nio/MidiIn.h
 | 
12
+++++++++---

2 files changed, 66 insertions(+), 3 deletions(-)
diff --git a/src/Nio/MidiIn.cpp b/src/Nio/MidiIn.cpp
@@ -17,12 +17,69 @@
 
 namespace zyn {
 
+MidiIn::MidiIn()
+{
+    sysex_offset = 0;
+    memset(sysex_data, 0, sizeof(sysex_data));
+}
+
+uint8_t MidiIn::midiSysEx(unsigned char data)
+{
+    if (data & 0x80) {
+        if (data == 0xF0) {
+		sysex_offset = 0; /* begin */
+        } else if (data == 0xF7) {
+                return (2); /* end */
+        } else {
+                return (1); /* error */
+        }
+    } else if (sysex_offset >= sizeof(sysex_data)) {
+        return (1); /* error */
+    }
+    sysex_data[sysex_offset++] = data;
+    return (0);
+}
+
 void MidiIn::midiProcess(unsigned char head,
                          unsigned char num,
                          unsigned char value)
 {
     MidiEvent     ev;
     unsigned char chan = head & 0x0f;
+
+    /* SYSEX handling */
+    if (head == 0xF0 || sysex_offset != 0) {
+        uint8_t status = 0;
+
+        status |= midiSysEx(head);
+        status |= midiSysEx(num);
+        status |= midiSysEx(value);
+
+        if (status & 1) {
+            /* error parsing SYSEX */
+            sysex_offset = 0;
+        } else if (status & 2) {
+            /* message complete */
+
+            if (sysex_offset >= 10 &&
+                sysex_data[1] == 0x0A &&
+                sysex_data[2] == 0x55) {
+                ev.type = M_FLOAT_NOTE;
+                ev.channel = sysex_data[3] & 0x0F;
+                ev.num = sysex_data[4];
+                ev.value = sysex_data[5];
+                ev.log2_freq = (sysex_data[6] +
+                  (sysex_data[7] / (128.0f)) +
+                  (sysex_data[8] / (128.0f * 128.0f)) +
+                  (sysex_data[9] / (128.0f * 128.0f * 128.0f))
+                  ) / 12.0f;
+                InMgr::getInstance().putEvent(ev);
+            }
+            return; /* message complete */
+        } else {
+	    return; /* wait for more data */
+        }
+    }
     switch(head & 0xf0) {
         case 0x80: //Note Off
             ev.type    = M_NOTE;
diff --git a/src/Nio/MidiIn.h b/src/Nio/MidiIn.h
@@ -24,13 +24,19 @@ namespace zyn {
 class MidiIn:public virtual Engine
 {
     public:
+        MidiIn();
+
         /**Enables or disables driver based upon value*/
         virtual void setMidiEn(bool nval) = 0;
         /**Returns if driver is initialized*/
         virtual bool getMidiEn() const = 0;
-        static void midiProcess(unsigned char head,
-                                unsigned char num,
-                                unsigned char value);
+        void midiProcess(unsigned char head,
+                         unsigned char num,
+                         unsigned char value);
+    private:
+        uint8_t midiSysEx(unsigned char data);
+        uint8_t sysex_offset;
+        uint8_t sysex_data[64];
 };
 
 }