internal plugins: Allow to notify UI of MIDI events

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/engine/CarlaEngineNative.cpp

@@ -1661,7 +1661,8 @@ public:
     }
 
     static intptr_t _dispatcher(NativePluginHandle handle,
-                                NativePluginDispatcherOpcode opcode, int32_t index, intptr_t value, void* ptr, float opt)
+                                NativePluginDispatcherOpcode opcode,
+                                int32_t index, intptr_t value, void* ptr, float opt)
     {
         switch(opcode)
         {
@@ -1688,6 +1689,8 @@ public:
         case NATIVE_PLUGIN_OPCODE_IDLE:
             //handlePtr->idle();
             return 0;
+        case NATIVE_PLUGIN_OPCODE_UI_MIDI_EVENT:
+            return 0;
         }
 
         return 0;

source/backend/plugin/CarlaPluginNative.cpp

@@ -2645,7 +2645,18 @@ public:
         if (! fIsUiVisible)
             return;
 
-        // TODO
+        if (fDescriptor->dispatcher != nullptr)
+        {
+            uint8_t data[3] = {
+                uint8_t(MIDI_STATUS_NOTE_ON | (channel & MIDI_CHANNEL_BIT)),
+                note,
+                velo
+            };
+            fDescriptor->dispatcher(fHandle, NATIVE_PLUGIN_OPCODE_UI_MIDI_EVENT,
+                                    3, 0,
+                                    data,
+                                    0.0f);
+        }
     }
 
     void uiNoteOff(const uint8_t channel, const uint8_t note) noexcept override
@@ -2660,7 +2671,18 @@ public:
         if (fDescriptor == nullptr || fHandle == nullptr)
             return;
 
-        // TODO
+        if (fDescriptor->dispatcher != nullptr)
+        {
+            uint8_t data[3] = {
+                uint8_t(MIDI_STATUS_NOTE_OFF | (channel & MIDI_CHANNEL_BIT)),
+                note,
+                0
+            };
+            fDescriptor->dispatcher(fHandle, NATIVE_PLUGIN_OPCODE_UI_MIDI_EVENT,
+                                    3, 0,
+                                    data,
+                                    0.0f);
+        }
     }
 
     // -------------------------------------------------------------------

source/includes/CarlaNative.h

@@ -99,7 +99,8 @@ typedef enum {
     NATIVE_PLUGIN_OPCODE_OFFLINE_CHANGED     = 3, /** uses value (0=off, 1=on) */
     NATIVE_PLUGIN_OPCODE_UI_NAME_CHANGED     = 4, /** uses ptr                 */
     NATIVE_PLUGIN_OPCODE_GET_INTERNAL_HANDLE = 5, /** nothing                  */
-    NATIVE_PLUGIN_OPCODE_IDLE                = 6  /** nothing                  */
+    NATIVE_PLUGIN_OPCODE_IDLE                = 6, /** nothing                  */
+    NATIVE_PLUGIN_OPCODE_UI_MIDI_EVENT       = 7  /** uses ptr                 */
 } NativePluginDispatcherOpcode;
 
 typedef enum {

source/includes/CarlaNative.hpp

@@ -405,6 +405,15 @@ protected:
         CARLA_SAFE_ASSERT_RETURN(uiName != nullptr && uiName[0] != '\0',);
     }
 
+    virtual bool uiMIDIEvent(uint8_t size, const uint8_t data[])
+    {
+        return false;
+
+        // unused
+        (void)size;
+        (void)data;
+    }
+
     virtual const NativeInlineDisplayImageSurface* renderInlineDisplay(const uint32_t width, const uint32_t height)
     {
         CARLA_SAFE_ASSERT_RETURN(width > 0 && height > 0, nullptr);
@@ -545,6 +554,11 @@ public:
         case NATIVE_PLUGIN_OPCODE_IDLE:
             handlePtr->idle();
             return 0;
+        case NATIVE_PLUGIN_OPCODE_UI_MIDI_EVENT:
+            CARLA_SAFE_ASSERT_RETURN(index >= 0 && index < UINT8_MAX, 0);
+            CARLA_SAFE_ASSERT_RETURN(ptr != nullptr, 0);
+            return handlePtr->uiMIDIEvent(static_cast<uint8_t>(index),
+                                          static_cast<uint8_t*>(ptr));
         }
 
         return 0;

source/includes/CarlaNativeExtUI.hpp

@@ -1,6 +1,6 @@
 /*
  * Carla Native Plugin API (C++)
- * Copyright (C) 2012-2016 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2012-2020 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -20,6 +20,7 @@
 
 #include "CarlaNative.hpp"
 #include "CarlaExternalUI.hpp"
+#include "CarlaMIDI.h"
 
 /*!
  * @defgroup CarlaNativeAPI Carla Native API
@@ -136,6 +137,22 @@ protected:
         flushMessages();
     }
 
+    bool uiMIDIEvent(const uint8_t size, const uint8_t data[]) override
+    {
+        if (size != 3)
+            return false;
+
+        const uint8_t status = MIDI_GET_STATUS_FROM_DATA(data);
+
+        if (! (MIDI_IS_STATUS_NOTE_ON(status) || MIDI_IS_STATUS_NOTE_OFF(status)))
+            return false;
+
+        writeMidiNoteMessage(MIDI_IS_STATUS_NOTE_ON(status),
+                             MIDI_GET_CHANNEL_FROM_DATA(data),
+                             data[1], data[2]);
+        return true;
+    }
+
     // -------------------------------------------------------------------
     // Pipe Server calls
 
@@ -161,9 +178,10 @@ protected:
 
         if (std::strcmp(msg, "program") == 0)
         {
-            uint32_t channel, bank, program;
+            uint8_t channel;
+            uint32_t bank, program;
 
-            CARLA_SAFE_ASSERT_RETURN(readNextLineAsUInt(channel), true);
+            CARLA_SAFE_ASSERT_RETURN(readNextLineAsByte(channel), true);
             CARLA_SAFE_ASSERT_RETURN(readNextLineAsUInt(bank), true);
             CARLA_SAFE_ASSERT_RETURN(readNextLineAsUInt(program), true);
             CARLA_SAFE_ASSERT_RETURN(channel < MAX_MIDI_CHANNELS, true);