Prevent assertion failure if _jack_output_port is 0, which can happen if JACK is...

git-svn-id: svn://localhost/ardour2/branches/3.0@7371 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/libs/midi++2/jack_midiport.cc b/libs/midi++2/jack_midiport.cc
index eb8b6a072a0e5b49537c3f7bad60ee821234187a..07b044f077dfa0ee785634228d2efd436127987f 100644 (file)
--- a/libs/midi++2/jack_midiport.cc
+++ b/libs/midi++2/jack_midiport.cc
@@ -132,6 +132,10 @@ JACK_MidiPort::write(byte * msg, size_t msglen, timestamp_t timestamp)
 {
        int ret = 0;
 
+       if (!_jack_output_port) {
+               return ret;
+       }
+       
        if (!is_process_thread()) {
 
                Glib::Mutex::Lock lm (output_fifo_lock);
@@ -162,8 +166,6 @@ JACK_MidiPort::write(byte * msg, size_t msglen, timestamp_t timestamp)
 
        } else {
 
-               assert(_jack_output_port);
-               
                // XXX This had to be temporarily commented out to make export work again
                if (!(timestamp < _nframes_this_cycle)) {
                        std::cerr << "assertion timestamp < _nframes_this_cycle failed!" << std::endl;