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authorMichael Fisher <mfisher31@gmail.com>2013-07-28 17:18:30 -0500
committerRobin Gareus <robin@gareus.org>2013-07-29 20:05:11 +0200
commit3538fa84425069be35e3b1cd1e0c898bbfa43fed (patch)
treefe97df9a9e71f029c4bd747c0a4cb8ea62f72033 /libs/ardour/session_midi.cc
parent79d134ca78a484fb13818295bf8a050b69bce6d6 (diff)
Add method to send a song position pointer message
Diffstat (limited to 'libs/ardour/session_midi.cc')
-rw-r--r--libs/ardour/session_midi.cc39
1 files changed, 39 insertions, 0 deletions
diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index 50a7178f1b..66ad0ccc2a 100644
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -45,6 +45,7 @@
#include "ardour/midi_ui.h"
#include "ardour/session.h"
#include "ardour/slave.h"
+#include "ardour/tempo.h"
#include "i18n.h"
@@ -581,6 +582,44 @@ Session::mmc_step_timeout ()
return true;
}
+/***********************************************************************
+ OUTBOUND SYSTEM COMMON STUFF
+**********************************************************************/
+
+
+void
+Session::send_song_position_pointer (framepos_t t)
+{
+ /* This doesn't account for the Meter's note divisor */
+ if (!_engine.freewheeling()) {
+
+ Timecode::BBT_Time time;
+ bbt_time (t, time);
+
+ const double beats_per_bar = tempo_map().meter_at(t).divisions_per_bar();
+
+ /* Midi Beats in terms of Song Position Pointer is equivalent to total
+ sixteenth notes at 'time' */
+ const uint32_t midi_beats = 4 * (((time.bars - 1) * beats_per_bar) + time.beats - 1);
+
+ /* can only use 14bits worth */
+ if (midi_beats > 0x3fff) {
+ return;
+ }
+
+ /* split midi beats into a 14bit value */
+ MIDI::byte msg[3] = {
+ 0xf2, /* MIDI System Common - Song Position Pointer status */
+ midi_beats & 0x7f,
+ midi_beats & 0x3f80
+ };
+
+ if (MIDI::Port* port = MIDI::Manager::instance()->midi_clock_output_port()) {
+ port->midimsg (msg, sizeof (msg), 0);
+ }
+ }
+}
+
int
Session::start_midi_thread ()
{