Don't busy chip channels with blank notes!

1 files changed, 24 insertions, 2 deletions

diff --git a/src/adlmidi_midiplay.cpp b/src/adlmidi_midiplay.cpp
index 4f57374..9841f73 100644
--- a/src/adlmidi_midiplay.cpp
+++ b/src/adlmidi_midiplay.cpp
@@ -397,13 +397,27 @@ bool MIDIplay::realTime_NoteOn(uint8_t channel, uint8_t note, uint8_t velocity)
     if((m_synth.m_rhythmMode == 1) && PercussionMap[midiins & 0xFF])
         voices[1] = voices[0];//i[1] = i[0];
 
+    bool isBlankNote = (ains->flags & adlinsdata::Flag_NoSound);
+
     if(hooks.onDebugMessage)
     {
-        if((ains->flags & adlinsdata::Flag_NoSound) &&
-           caugh_missing_instruments.insert(static_cast<uint8_t>(midiins)).second)
+        if(isBlankNote && caugh_missing_instruments.insert(static_cast<uint8_t>(midiins)).second)
             hooks.onDebugMessage(hooks.onDebugMessage_userData, "[%i] Playing missing instrument %i", channel, midiins);
     }
 
+    if(isBlankNote)
+    {
+        // Don't even try to play the blank instrument! But, insert the dummy note.
+        std::pair<MIDIchannel::activenoteiterator, bool>
+        dummy = midiChan.activenotes_insert(note);
+        dummy.first->isBlank = true;
+        dummy.first->ains = NULL;
+        dummy.first->chip_channels_count = 0;
+        // Record the last note on MIDI channel as source of portamento
+        midiChan.portamentoSource = static_cast<int8_t>(note);
+        return false;
+    }
+
     // Allocate AdLib channel (the physical sound channel for the note)
     int32_t adlchannel[MIDIchannel::NoteInfo::MaxNumPhysChans] = { -1, -1 };
 
@@ -500,6 +514,7 @@ bool MIDIplay::realTime_NoteOn(uint8_t channel, uint8_t note, uint8_t velocity)
     ir.first->glideRate = HUGE_VAL;
     ir.first->midiins = midiins;
     ir.first->isPercussion = isPercussion;
+    ir.first->isBlank = isBlankNote;
     ir.first->ains = ains;
     ir.first->chip_channels_count = 0;
 
@@ -1045,6 +1060,13 @@ void MIDIplay::noteUpdate(size_t midCh,
     my_loc.MidCh = static_cast<uint16_t>(midCh);
     my_loc.note  = info.note;
 
+    if(info.isBlank)
+    {
+        if(props_mask & Upd_Off)
+            m_midiChannels[midCh].activenotes_erase(i);
+        return;
+    }
+
     for(unsigned ccount = 0, ctotal = info.chip_channels_count; ccount < ctotal; ccount++)
     {
         const MIDIchannel::NoteInfo::Phys &ins = info.chip_channels[ccount];