Fix audio analysis attempts with source files that have more channels than the film.

[dcpomatic.git] / src / lib / audio_analyser.cc

diff --git a/src/lib/audio_analyser.cc b/src/lib/audio_analyser.cc
index 45097c5b619cdcab5d296da3c963aaf7632763c0..df76932dedb36ebad107754c6baf3f2a1fa4cd39 100644 (file)
--- a/src/lib/audio_analyser.cc
+++ b/src/lib/audio_analyser.cc
@@ -86,10 +86,18 @@ AudioAnalyser::AudioAnalyser (shared_ptr<const Film> film, shared_ptr<const Play
                }
        };
 
-       _leqm_channels = film->audio_channels();
        auto content = _playlist->content();
        if (content.size() == 1 && content[0]->audio) {
-               _leqm_channels = content[0]->audio->mapping().mapped_output_channels().size();
+               _leqm_channels = 0;
+               for (auto channel: content[0]->audio->mapping().mapped_output_channels()) {
+                       /* This means that if, for example, a file only maps C we will
+                        * calculate LEQ(m) for L, R and C.  I'm not sure if this is
+                        * right or not.
+                        */
+                       _leqm_channels = std::min(film->audio_channels(), channel + 1);
+               }
+       } else {
+               _leqm_channels = film->audio_channels();
        }
 
        /* XXX: is this right?  Especially for more than 5.1? */