patch from robin to fix where the transport start occurs when exporting (#4098)

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

diff --git a/libs/ardour/session_export.cc b/libs/ardour/session_export.cc
index 1c1b4f9a0f1acd7831c3b6fd1f060c26c5f9afb6..969f4bb609d81d76ef970962b9faa5fae36e4c07 100644 (file)
--- a/libs/ardour/session_export.cc
+++ b/libs/ardour/session_export.cc
@@ -106,6 +106,7 @@ Session::start_audio_export (framepos_t position)
 {
        if (!_exporting) {
                pre_export ();
+               _export_started = false;
        }
 
        /* We're about to call Track::seek, so the butler must have finished everything
@@ -145,11 +146,6 @@ Session::start_audio_export (framepos_t position)
           since then has re-awakened it.
         */
 
-       set_transport_speed (1.0, false);
-       butler_transport_work ();
-       g_atomic_int_set (&_butler->should_do_transport_work, 0);
-       post_transport ();
-
        /* we are ready to go ... */
 
        if (!_engine.connected()) {
@@ -193,6 +189,16 @@ Session::process_export (pframes_t nframes)
 int
 Session::process_export_fw (pframes_t nframes)
 {
+
+       if (!_export_started) {
+               _export_started=true;
+               set_transport_speed (1.0, false);
+               butler_transport_work ();
+               g_atomic_int_set (&_butler->should_do_transport_work, 0);
+               post_transport ();
+               return 0;
+       }
+
         _engine.main_thread()->get_buffers ();
        process_export (nframes);
         _engine.main_thread()->drop_buffers ();