Split metronome methods into re-usable parts (for count-in)

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

diff --git a/libs/ardour/session_click.cc b/libs/ardour/session_click.cc
index 9c67ebef869c99d6d8b22101815d58f7e102b832..08aa0cc446605a572f9a3ffb7788a8eb7b0098af 100644 (file)
--- a/libs/ardour/session_click.cc
+++ b/libs/ardour/session_click.cc
@@ -39,11 +39,24 @@ using namespace PBD;
 
 Pool Click::pool ("click", sizeof (Click), 1024);
 
+void
+Session::add_click (framepos_t pos, bool emphasis)
+{
+       if (emphasis) {
+               if (click_emphasis_data && Config->get_use_click_emphasis () == true) {
+                       clicks.push_back (new Click (pos, click_emphasis_length, click_emphasis_data));
+               } else if (click_data && Config->get_use_click_emphasis () == false) {
+                       clicks.push_back (new Click (pos, click_length, click_data));
+               }
+       } else if (click_data) {
+               clicks.push_back (new Click (pos, click_length, click_data));
+       }
+}
+
 void
 Session::click (framepos_t start, framecnt_t nframes)
 {
        vector<TempoMap::BBTPoint> points;
-       Sample *buf;
        framecnt_t click_distance;
 
        if (_click_io == 0) {
@@ -68,9 +81,6 @@ Session::click (framepos_t start, framecnt_t nframes)
        /* correct start, potentially */
        start = max (start, (framepos_t) 0);
 
-       BufferSet& bufs = get_scratch_buffers(ChanCount(DataType::AUDIO, 1));
-       buf = bufs.get_audio(0).data();
-
        _tempo_map->get_grid (points, start, end);
 
        if (distance (points.begin(), points.end()) == 0) {
@@ -80,22 +90,34 @@ Session::click (framepos_t start, framecnt_t nframes)
        for (vector<TempoMap::BBTPoint>::iterator i = points.begin(); i != points.end(); ++i) {
                switch ((*i).beat) {
                case 1:
-                       if (click_emphasis_data && Config->get_use_click_emphasis () == true) {
-                               clicks.push_back (new Click ((*i).frame, click_emphasis_length, click_emphasis_data));
-                       } else if (click_data && Config->get_use_click_emphasis () == false) {
-                               clicks.push_back (new Click ((*i).frame, click_length, click_data));
-                       }
+                       add_click ((*i).frame, true);
                        break;
-
                default:
-                       if (click_emphasis_data == 0 || (Config->get_use_click_emphasis () == false) || (click_emphasis_data && (*i).beat != 1)) {
-                               clicks.push_back (new Click ((*i).frame, click_length, click_data));
+                       if (click_emphasis_data == 0 || (Config->get_use_click_emphasis () == false) || (click_emphasis_data && (*i).beat != 1)) { // XXX why is this check needed ??
+                               add_click ((*i).frame, false);
                        }
                        break;
                }
        }
 
   run_clicks:
+       clickm.release ();
+       run_click (start, nframes);
+}
+
+void
+Session::run_click (framepos_t start, framepos_t nframes)
+{
+       Glib::Threads::RWLock::ReaderLock clickm (click_lock, Glib::Threads::TRY_LOCK);
+
+       if (!clickm.locked() || click_data == 0) {
+               _click_io->silence (nframes);
+               return;
+       }
+
+       Sample *buf;
+       BufferSet& bufs = get_scratch_buffers(ChanCount(DataType::AUDIO, 1));
+       buf = bufs.get_audio(0).data();
        memset (buf, 0, sizeof (Sample) * nframes);
 
        for (list<Click*>::iterator i = clicks.begin(); i != clicks.end(); ) {