From 2c03edf215192f735a3d941a343a71c41b86a560 Mon Sep 17 00:00:00 2001
From: Werner Schweer <ws.seh.de>
Date: Sun, 29 Oct 2006 10:44:07 +0000
Subject: fixed crash during midi recording

---
 muse/ChangeLog           |  3 +++
 muse/muse/midi.cpp       |  7 ++++---
 muse/muse/midiinport.cpp | 44 +++++++++++++++++++++++++++++++++++++-------
 muse/muse/midiinport.h   |  8 +++++++-
 muse/muse/synth.cpp      |  1 +
 5 files changed, 52 insertions(+), 11 deletions(-)

diff --git a/muse/ChangeLog b/muse/ChangeLog
index b3f2b6e5..65091471 100644
--- a/muse/ChangeLog
+++ b/muse/ChangeLog
@@ -1,3 +1,6 @@
+29.10 (ws)
+      - fixed crash after some time of midi recording: made midi 
+        input queue thread safe.
 27.10 (ws)
       - added a MESS port of the Zynaddsubfx software synthesizer
 25.10 (ws)
diff --git a/muse/muse/midi.cpp b/muse/muse/midi.cpp
index 987567ce..0eaeceb4 100644
--- a/muse/muse/midi.cpp
+++ b/muse/muse/midi.cpp
@@ -639,15 +639,16 @@ void Audio::initDevices()
 
 void Audio::processMidi()
       {
+      MidiInPortList* il = song->midiInPorts();
+      for (iMidiInPort id = il->begin(); id != il->end(); ++id)
+            (*id)->beforeProcess();
+            
       MidiOutPortList* ol = song->midiOutPorts();
       for (iMidiOutPort id = ol->begin(); id != ol->end(); ++id) {
             (*id)->process(_curTickPos, _nextTickPos, _pos.frame(), _pos.frame() + segmentSize);
             }
-
-      MidiInPortList* il = song->midiInPorts();
       for (iMidiInPort id = il->begin(); id != il->end(); ++id) {
             MidiInPort* port = *id;
-
             //
             // process routing to synti
             //
diff --git a/muse/muse/midiinport.cpp b/muse/muse/midiinport.cpp
index 8d2db3c9..42fe2677 100644
--- a/muse/muse/midiinport.cpp
+++ b/muse/muse/midiinport.cpp
@@ -36,7 +36,10 @@
 MidiInPort::MidiInPort()
    : MidiTrackBase(MIDI_IN)
       {
-      _channels = 1;
+      _channels   = 1;
+      recordRead  = 0;
+      recordWrite = 0;
+      recordCount = 0;
       }
 
 //---------------------------------------------------------
@@ -88,6 +91,7 @@ void MidiInPort::read(QDomNode node)
 
 //---------------------------------------------------------
 //   midiReceived
+//    called from midiSeq context
 //---------------------------------------------------------
 
 #ifndef __APPLE__
@@ -96,6 +100,7 @@ void MidiInPort::eventReceived(snd_seq_event_t* ev)
       MidiEvent event;
       event.setB(0);
       event.setTime(audioDriver->framePos());
+
       switch(ev->type) {
             case SND_SEQ_EVENT_NOTEON:
                   event.setChannel(ev->data.note.channel);
@@ -173,7 +178,15 @@ void MidiInPort::eventReceived(snd_seq_event_t* ev)
             if (i->type() == ME_NOTEON)
                   addMidiMeter(i->dataB());
             song->putEvent(*i);
-            _recordEvents.add(*i);
+            if (recordCount == RECORD_FIFO_SIZE) {
+                  printf("MusE: eventReceived(): fifo overflow\n");
+                  continue;
+                  }
+            recordFifo[recordWrite] = *i;
+            ++recordWrite;
+            if (recordWrite == RECORD_FIFO_SIZE)
+                  recordWrite = 0;
+            ++recordCount;
             }
       }
 #endif
@@ -185,19 +198,36 @@ void MidiInPort::eventReceived(snd_seq_event_t* ev)
 
 void MidiInPort::afterProcess()
       {
-      _recordEvents.clear();
+      while (tmpRecordCount--) {
+            ++recordRead;
+            if (recordRead >= RECORD_FIFO_SIZE)
+                  recordRead = 0;
+            --recordCount;
+            }
+      }
+
+//---------------------------------------------------------
+//   beforeProcess
+//---------------------------------------------------------
+
+void MidiInPort::beforeProcess()
+      {
+      tmpRecordCount = recordCount;
       }
 
 //---------------------------------------------------------
 //   getEvents
+//    called from jack process context
 //---------------------------------------------------------
 
 void MidiInPort::getEvents(unsigned, unsigned, int ch, MPEventList* dst)
       {
-      for (iMPEvent i = _recordEvents.begin(); i != _recordEvents.end(); ++i) {
-            if (i->channel() == ch || ch == -1)
-                  dst->insert(*i);
+      int tmpRecordRead = recordRead;
+      for (int i = 0; i < tmpRecordCount; ++i) {
+            dst->insert(recordFifo[tmpRecordRead]);
+            ++tmpRecordRead;
+            if (tmpRecordRead >= RECORD_FIFO_SIZE)
+                  tmpRecordRead = 0;
             }
       }
 
-
diff --git a/muse/muse/midiinport.h b/muse/muse/midiinport.h
index d1c294eb..9f2d5134 100644
--- a/muse/muse/midiinport.h
+++ b/muse/muse/midiinport.h
@@ -23,6 +23,8 @@
 
 #include "track.h"
 
+static const int RECORD_FIFO_SIZE = 512;
+
 //---------------------------------------------------------
 //   MidiInPort
 //---------------------------------------------------------
@@ -30,7 +32,10 @@
 class MidiInPort : public MidiTrackBase {
       Q_OBJECT
 
-      MPEventList _recordEvents;
+      MidiEvent recordFifo[RECORD_FIFO_SIZE];
+      int recordRead, recordWrite;
+      volatile int recordCount;
+      int tmpRecordCount;
 
    public:
       MidiInPort();
@@ -47,6 +52,7 @@ class MidiInPort : public MidiTrackBase {
       void eventReceived(snd_seq_event_t*);
 #endif
       virtual void getEvents(unsigned from, unsigned to, int channel, MPEventList* dst);
+      void beforeProcess();
       void afterProcess();
       };
 
diff --git a/muse/muse/synth.cpp b/muse/muse/synth.cpp
index 0e75dad5..1adf3c7b 100644
--- a/muse/muse/synth.cpp
+++ b/muse/muse/synth.cpp
@@ -554,6 +554,7 @@ iMPEvent MessSynthIF::getData(MPEventList* el, iMPEvent i, unsigned pos, int por
 
 bool MessSynthIF::putEvent(const MidiEvent& ev)
       {
+// printf("put event %x %x %x\n", ev.type(), ev.dataA(), ev.dataB());
       if (midiOutputTrace)
             ev.dump();
       if (_mess)
-- 
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