From 48ec16f3d2a04295767b6bac38aed7bef5180881 Mon Sep 17 00:00:00 2001
From: Wohlstand <admin@wohlnet.ru>
Date: Wed, 29 Jun 2022 18:27:00 +0300
Subject: Added the chip channels allocation mode option

---
 src/adlmidi.cpp          | 23 +++++++++++++++++++++++
 src/adlmidi_midiplay.cpp | 30 ++++++++++++++++++++++--------
 src/adlmidi_opl3.cpp     |  4 +++-
 src/adlmidi_opl3.hpp     |  3 +++
 4 files changed, 51 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/adlmidi.cpp b/src/adlmidi.cpp
index 54d839b..a9ec918 100644
--- a/src/adlmidi.cpp
+++ b/src/adlmidi.cpp
@@ -651,6 +651,29 @@ ADLMIDI_EXPORT int adl_getVolumeRangeModel(struct ADL_MIDIPlayer *device)
     return play->m_synth->getVolumeScaleModel();
 }
 
+ADLMIDI_EXPORT void adl_setChannelAllocMode(struct ADL_MIDIPlayer *device, int chanalloc)
+{
+    if(!device)
+        return;
+    MidiPlayer *play = GET_MIDI_PLAYER(device);
+    assert(play);
+    Synth &synth = *play->m_synth;
+
+    if(chanalloc < -1 || chanalloc >= ADLMIDI_ChanAlloc_Count)
+        chanalloc = ADLMIDI_ChanAlloc_AUTO;
+
+    synth.m_channelAlloc = static_cast<ADLMIDI_ChannelAlloc>(chanalloc);
+}
+
+ADLMIDI_EXPORT int adl_getChannelAllocMode(struct ADL_MIDIPlayer *device)
+{
+    if(!device)
+        return -1;
+    MidiPlayer *play = GET_MIDI_PLAYER(device);
+    assert(play);
+    return static_cast<int>(play->m_synth->m_channelAlloc);
+}
+
 ADLMIDI_EXPORT int adl_openBankFile(struct ADL_MIDIPlayer *device, const char *filePath)
 {
     if(device)
diff --git a/src/adlmidi_midiplay.cpp b/src/adlmidi_midiplay.cpp
index 3f4adc9..5576e65 100644
--- a/src/adlmidi_midiplay.cpp
+++ b/src/adlmidi_midiplay.cpp
@@ -1348,6 +1348,17 @@ int64_t MIDIplay::calculateChipChannelGoodness(size_t c, const MIDIchannel::Note
     const AdlChannel &chan = m_chipChannels[c];
     int64_t koff_ms = chan.koff_time_until_neglible_us / 1000;
     int64_t s = -koff_ms;
+    ADLMIDI_ChannelAlloc allocType = synth.m_channelAlloc;
+
+    if(allocType == ADLMIDI_ChanAlloc_AUTO)
+    {
+        if(synth.m_musicMode == Synth::MODE_CMF)
+            allocType = ADLMIDI_ChanAlloc_SameInst;
+        else if(synth.m_volumeScale == Synth::VOLUME_HMI)
+            allocType = ADLMIDI_ChanAlloc_AnyReleased; // HMI doesn't care about the same instrument
+        else
+            allocType = ADLMIDI_ChanAlloc_OffDelay;
+    }
 
     // Rate channel with a releasing note
     if(s < 0 && chan.users.empty())
@@ -1356,19 +1367,22 @@ int64_t MIDIplay::calculateChipChannelGoodness(size_t c, const MIDIchannel::Note
         s -= 40000;
 
         // If it's same instrument, better chance to get it when no free channels
-        if(synth.m_musicMode == Synth::MODE_CMF)
+        switch(allocType)
         {
+        case ADLMIDI_ChanAlloc_SameInst:
             if(isSame)
                 s = 0; // Re-use releasing channel with the same instrument
-        }
-        else if(synth.m_volumeScale == Synth::VOLUME_HMI)
-        {
-            s = 0; // HMI doesn't care about the same instrument
-        }
-        else
-        {
+            break;
+
+        case ADLMIDI_ChanAlloc_AnyReleased:
+            s = 0; // Re-use any releasing channel
+            break;
+
+        default:
+        case ADLMIDI_ChanAlloc_OffDelay:
             if(isSame)
                 s =  -koff_ms; // Wait until releasing sound will complete
+            break;
         }
 
         return s;
diff --git a/src/adlmidi_opl3.cpp b/src/adlmidi_opl3.cpp
index dc5644f..e3c627c 100644
--- a/src/adlmidi_opl3.cpp
+++ b/src/adlmidi_opl3.cpp
@@ -868,7 +868,8 @@ OPL3::OPL3() :
     m_softPanning(false),
     m_masterVolume(MasterVolumeDefault),
     m_musicMode(MODE_MIDI),
-    m_volumeScale(VOLUME_Generic)
+    m_volumeScale(VOLUME_Generic),
+    m_channelAlloc(ADLMIDI_ChanAlloc_AUTO)
 {
     m_insBankSetup.volumeModel = OPL3::VOLUME_Generic;
     m_insBankSetup.deepTremolo = false;
@@ -1630,6 +1631,7 @@ void OPL3::setVolumeScaleModel(ADLMIDI_VolumeModels volumeModel)
 {
     switch(volumeModel)
     {
+    default:
     case ADLMIDI_VolumeModel_AUTO://Do nothing until restart playing
         break;
 
diff --git a/src/adlmidi_opl3.hpp b/src/adlmidi_opl3.hpp
index f15e413..e36997b 100644
--- a/src/adlmidi_opl3.hpp
+++ b/src/adlmidi_opl3.hpp
@@ -162,6 +162,9 @@ public:
         VOLUME_HMI_OLD
     } m_volumeScale;
 
+    //! Channel allocation algorithm
+    ADLMIDI_ChannelAlloc m_channelAlloc;
+
     //! Reserved
     char _padding3[8];
 
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