Reduce unnecessary non-const MIDI buffer access.

[ardour.git] / libs / ardour / meter.cc

diff --git a/libs/ardour/meter.cc b/libs/ardour/meter.cc
index 80690bd74479e2d77c68c9ff574d77d7ab8f27f7..5913ca54773aa1b70b47454f5a6d64e9bd153ca1 100644 (file)
--- a/libs/ardour/meter.cc
+++ b/libs/ardour/meter.cc
@@ -87,9 +87,9 @@ PeakMeter::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_fr
        // Meter MIDI in to the first n_midi peaks
        for (uint32_t i = 0; i < n_midi; ++i, ++n) {
                float val = 0.0f;
-               MidiBuffer& buf (bufs.get_midi(i));
+               const MidiBuffer& buf (bufs.get_midi(i));
                
-               for (MidiBuffer::iterator e = buf.begin(); e != buf.end(); ++e) {
+               for (MidiBuffer::const_iterator e = buf.begin(); e != buf.end(); ++e) {
                        const Evoral::MIDIEvent<framepos_t> ev(*e, false);
                        if (ev.is_note_on()) {
                                const float this_vel = ev.buffer()[2] / 127.0;