allow user tweaking of everything that might have inherent latency; add GUI for track level adjustment and widget that can be (but is not yet) embedded in a plugin GUI

git-svn-id: svn://localhost/ardour2/trunk@2075 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 167 insertions, 0 deletions

diff --git a/gtk2_ardour/latency_gui.cc b/gtk2_ardour/latency_gui.cc
new file mode 100644
index 0000000000..0146bfdaa8
--- /dev/null
+++ b/gtk2_ardour/latency_gui.cc
@@ -0,0 +1,167 @@
+#define __STDC_FORMAT_MACROS 1
+#include <inttypes.h>
+
+#include <ardour/latent.h>
+#include <gtkmm2ext/utils.h>
+
+#include "latency_gui.h"
+
+#include "i18n.h"
+
+using namespace PBD;
+using namespace Gtk;
+using namespace Gtkmm2ext;
+using namespace sigc;
+using namespace ARDOUR;
+
+
+static const gchar *_unit_strings[] = {
+	N_("sample"),
+	N_("msec"),
+	N_("period"),
+	0
+};
+
+std::vector<std::string> LatencyGUI::unit_strings;
+
+void
+LatencyGUI::latency_printer (char *buf, unsigned int bufsize)
+{
+	double nframes = adjustment.get_value();
+
+	if (nframes < (sample_rate / 1000.0)) {
+		snprintf (buf, bufsize, "%" PRId64 " samples", (nframes64_t) rint (nframes));
+	} else {
+		snprintf (buf, bufsize, "%.2g msecs" , nframes / (sample_rate / 1000.0));
+	}
+}
+
+LatencyGUI::LatencyGUI (Latent& l, nframes64_t sr, nframes64_t psz)
+	: _latent (l),
+	  initial_value (_latent.signal_latency()),
+	  sample_rate (sr),
+	  period_size (psz),
+	  /* max 1 second, step by frames, page by msecs */
+	  adjustment (initial_value, 0.0, sample_rate, 1.0, sample_rate / 1000.0f),
+	  bc (adjustment, ignored, sigc::mem_fun (*this, &LatencyGUI::latency_printer)),
+	  reset_button (_("Automatic"))
+{
+	Widget* w;
+
+	if (unit_strings.empty()) {
+		unit_strings = I18N (_unit_strings);
+	}
+
+	set_popdown_strings (units_combo, unit_strings);	
+	units_combo.set_active_text (unit_strings.front());
+
+	w = manage (new Image (Stock::ADD, ICON_SIZE_BUTTON));
+	w->show ();
+	plus_button.add (*w);
+	w = manage (new Image (Stock::REMOVE, ICON_SIZE_BUTTON));
+	w->show ();
+	minus_button.add (*w);
+
+	hbox1.pack_start (bc, true, true);
+
+	hbox2.set_homogeneous (false);
+	hbox2.set_spacing (12);
+	hbox2.pack_start (reset_button);
+	hbox2.pack_start (minus_button);
+	hbox2.pack_start (plus_button);
+	hbox2.pack_start (units_combo, true, true);
+
+	minus_button.signal_clicked().connect (bind (mem_fun (*this, &LatencyGUI::change_latency_from_button), -1));
+	plus_button.signal_clicked().connect (bind (mem_fun (*this, &LatencyGUI::change_latency_from_button), 1));
+	reset_button.signal_clicked().connect (mem_fun (*this, &LatencyGUI::reset));
+
+	adjustment.signal_value_changed().connect (mem_fun (*this, &LatencyGUI::finish));
+
+	bc.set_size_request (-1, 25);
+	bc.set_style (BarController::LeftToRight);
+	bc.set_use_parent (true);
+	bc.set_name (X_("PluginSlider"));
+
+	set_spacing (12);
+	pack_start (hbox1, true, true);
+	pack_start (hbox2, true, true);
+}
+
+void
+LatencyGUI::finish ()
+{
+	nframes64_t new_value = (nframes64_t) adjustment.get_value();
+	if (new_value != initial_value) {
+		_latent.set_user_latency (new_value);
+	}
+}
+
+void
+LatencyGUI::reset ()
+{
+	_latent.set_user_latency (0);
+	adjustment.set_value (initial_value);
+}
+
+void
+LatencyGUI::refresh ()
+{
+	initial_value = _latent.signal_latency();
+	adjustment.set_value (initial_value);
+}
+
+void
+LatencyGUI::change_latency_from_button (int dir)
+{
+	Glib::ustring unitstr = units_combo.get_active_text();
+	double shift;
+
+	if (unitstr == unit_strings[0]) {
+		shift = 1;
+	} else if (unitstr == unit_strings[1]) {
+		shift = (sample_rate / 1000.0);
+	} else if (unitstr == unit_strings[2]) {
+		shift = period_size;
+	} else {
+		fatal << string_compose (_("programming error: %1 (%2)"), X_("illegal string in latency GUI units combo"), unitstr)
+		      << endmsg;
+		/*NOTREACHED*/
+	}
+
+	if (dir > 0) {
+		adjustment.set_value (adjustment.get_value() + shift);
+	} else {
+		adjustment.set_value (adjustment.get_value() - shift);
+	}
+}
+
+LatencyDialog::LatencyDialog (const Glib::ustring& title, Latent& l, nframes64_t sr, nframes64_t psz)
+	: ArdourDialog (title, false, true),
+	  lwidget (l, sr, psz)
+{
+	  
+	get_vbox()->pack_start (lwidget);
+	add_button (Stock::CANCEL, RESPONSE_CANCEL);
+	add_button (Stock::APPLY, RESPONSE_REJECT);
+	add_button (Stock::OK, RESPONSE_ACCEPT);
+
+	show_all ();
+	
+	while (true) {
+		int ret = run ();
+
+		switch (ret) {
+		case RESPONSE_ACCEPT:
+			return;
+			break;
+
+		case RESPONSE_REJECT:
+			lwidget.finish ();
+			break;
+		default:
+			return;
+		}
+	}
+}
+
+