do not try to process audio in a diskreader with no audio playlist

diff --git a/libs/ardour/disk_reader.cc b/libs/ardour/disk_reader.cc
index 700a058392b68210410ea7b3702962592fa8b168..1d306230f087ef0d0dbf41d142c1b26e095ffd27 100644 (file)
--- a/libs/ardour/disk_reader.cc
+++ b/libs/ardour/disk_reader.cc
@@ -309,7 +309,7 @@ DiskReader::run (BufferSet& bufs, samplepos_t start_sample, samplepos_t end_samp
                disk_samples_to_consume = nframes;
        }
 
-       if (c->empty()) {
+       if (c->empty() || !_playlists[DataType::AUDIO]) {
                /* do nothing with audio */
                goto midi;
        }