From f4f0d6195457c3c8c55a41a4dd4869d6653957c3 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Sat, 23 Jan 2021 18:32:13 +0800
Subject: Pass 4 effect buffers (as it should be) to fluid_synth_process.

Also retrieve active voices from the audio processing callback.
(the values are still messed up sometimes...)
---
 core/qmpmidioutfluid.cpp | 11 +++++++++--
 core/qmpmidioutfluid.hpp |  1 +
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/core/qmpmidioutfluid.cpp b/core/qmpmidioutfluid.cpp
index d2c0dcf..56e71a0 100644
--- a/core/qmpmidioutfluid.cpp
+++ b/core/qmpmidioutfluid.cpp
@@ -71,7 +71,8 @@ void qmpMidiOutFluid::deviceInit()
         [](void *t, int l, int nfx, float *fx[], int nout, float *out[])->int
         {
             qmpMidiOutFluid *self = static_cast<qmpMidiOutFluid*>(t);
-            fluid_synth_process(self->synth, l, nfx, fx, nout, out);
+            float *fxb[4] = {out[0], out[1], out[0], out[1]};
+            int ret = fluid_synth_process(self->synth, l, nout * 2, fxb, nout, out);
             double s = 0;
             for (int i = 0; i < nout; ++i)
             {
@@ -81,13 +82,15 @@ void qmpMidiOutFluid::deviceInit()
                 }
             }
             self->output_level = 20 * log10(sqrt(s));
-            return FLUID_OK;
+            self->voice_count = fluid_synth_get_active_voice_count(self->synth);
+            return ret;
         }
     , this);
     if (!adriver)
     {
         adriver = new_fluid_audio_driver(settings, synth);
         output_level = 1e9 + 7;
+        voice_count = -1;
     }
     if (!adriver)
     {
@@ -317,6 +320,10 @@ void qmpMidiOutFluid::update_preset_list()
 }
 int qmpMidiOutFluid::getPolyphone()
 {
+    if (~voice_count)
+    {
+        return voice_count;
+    }
     return synth ? fluid_synth_get_active_voice_count(synth) : 0;
 }
 int qmpMidiOutFluid::getMaxPolyphone()
diff --git a/core/qmpmidioutfluid.hpp b/core/qmpmidioutfluid.hpp
index 4fdceff..f194c17 100644
--- a/core/qmpmidioutfluid.hpp
+++ b/core/qmpmidioutfluid.hpp
@@ -30,6 +30,7 @@ private:
     int default_driver = -1;
     void update_preset_list();
     double output_level;
+    int voice_count;
 public:
     qmpMidiOutFluid();
     ~qmpMidiOutFluid();
-- 
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