Add a dedicated export method to MidiRegion

[ardour.git] / libs / ardour / midi_region.cc

diff --git a/libs/ardour/midi_region.cc b/libs/ardour/midi_region.cc
index 4c678c04e0d818f961a451c760857a6ab03d36a4..eef2811c5b963c7b438862cb02486ba86f0c783c 100644 (file)
--- a/libs/ardour/midi_region.cc
+++ b/libs/ardour/midi_region.cc
@@ -120,6 +120,37 @@ MidiRegion::~MidiRegion ()
 {
 }
 
+/** Export the MIDI data of the MidiRegion to a new MIDI file (SMF).
+ */
+bool
+MidiRegion::do_export (string path) const
+{
+       boost::shared_ptr<MidiSource> newsrc;
+
+       /* caller must check for pre-existing file */
+       assert (!path.empty());
+       assert (!Glib::file_test (path, Glib::FILE_TEST_EXISTS));
+       newsrc = boost::dynamic_pointer_cast<MidiSource>(
+               SourceFactory::createWritable(DataType::MIDI, _session,
+                                             path, false, _session.frame_rate()));
+
+       BeatsFramesConverter bfc (_session.tempo_map(), _position);
+       Evoral::Beats const bbegin = bfc.from (_start);
+       Evoral::Beats const bend = bfc.from (_start + _length);
+
+       {
+               /* Lock our source since we'll be reading from it.  write_to() will
+                  take a lock on newsrc. */
+               Source::Lock lm (midi_source(0)->mutex());
+               if (midi_source(0)->export_write_to (lm, newsrc, bbegin, bend)) {
+                       return false;
+               }
+       }
+
+       return true;
+}
+
+
 /** Create a new MidiRegion that has its own version of some/all of the Source used by another.
  */
 boost::shared_ptr<MidiRegion>