Hint on high audio levels (part of #822).

2 files changed, 22 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 8756166b4..aa661e337 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2016-05-25  Carl Hetherington  <cth@carlh.net>
 
+	* Add hint about excessive audio level (part of #822).
+
 	* Updated nl_NL translation from Rob van Nieuwkerk.
 
 2016-05-25  c.hetherington  <cth@carlh.net>
diff --git a/src/wx/hints_dialog.cc b/src/wx/hints_dialog.cc
index a2eefd39f..72ab0eef4 100644
--- a/src/wx/hints_dialog.cc
+++ b/src/wx/hints_dialog.cc
@@ -25,10 +25,12 @@
 #include "lib/subtitle_content.h"
 #include "lib/font.h"
 #include "lib/content.h"
+#include "lib/audio_analysis.h"
 #include <wx/richtext/richtextctrl.h>
 #include <boost/algorithm/string.hpp>
 #include <boost/foreach.hpp>
 
+using std::max;
 using boost::shared_ptr;
 using boost::optional;
 using boost::dynamic_pointer_cast;
@@ -172,6 +174,24 @@ HintsDialog::film_changed ()
 		_text->Newline ();
 	}
 
+	boost::filesystem::path path = film->audio_analysis_path (film->playlist ());
+	if (boost::filesystem::exists (path)) {
+		shared_ptr<AudioAnalysis> an (new AudioAnalysis (path));
+		if (an->sample_peak() || an->true_peak()) {
+			float const peak = max (an->sample_peak().get_value_or(0), an->true_peak().get_value_or(0));
+			float const peak_dB = 20 * log10 (peak) + an->gain_correction (film->playlist ());
+			if (peak_dB > -3 && peak_dB < -0.5) {
+				hint = true;
+				_text->WriteText (_("Your audio level is very high.  You should reduce the gain of your audio content."));
+				_text->Newline ();
+			} else if (peak_dB > -0.5) {
+				hint = true;
+				_text->WriteText (_("Your audio level is very close to clipping.  You should reduce the gain of your audio content."));
+				_text->Newline ();
+			}
+		}
+	}
+
 	_text->EndSymbolBullet ();
 
 	if (!hint) {