AU synth inplace processing

diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index cab6a56c9275f14eb1844e83edfcf010dd906294..2ded196f52a2d35a973606f08e147699a7ae7215 100644 (file)
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -1471,9 +1471,18 @@ AUPlugin::connect_and_run (BufferSet& bufs, ChanMapping in_map, ChanMapping out_
                _last_nframes = nframes;
        }
 
-       DEBUG_TRACE (DEBUG::AudioUnits, string_compose ("%1 in %2 out %3 MIDI %4 bufs %5 (available %6)\n",
+       /* test if we can run in-place; only compare audio buffers */
+       bool inplace = true;
+       ChanMapping::Mappings inmap (in_map.mappings ());
+       ChanMapping::Mappings outmap (out_map.mappings ());
+       assert (outmap[DataType::AUDIO].size () > 0);
+       if (inmap[DataType::AUDIO].size() > 0 && inmap != outmap) {
+               inplace = false;
+       }
+
+       DEBUG_TRACE (DEBUG::AudioUnits, string_compose ("%1 in %2 out %3 MIDI %4 bufs %5 (available %6) Inplace: %7\n",
                                name(), input_channels, output_channels, _has_midi_input,
-                               bufs.count(), bufs.available()));
+                               bufs.count(), bufs.available(), inplace));
 
        /* the apparent number of buffers matches our input configuration, but we know that the bufferset
         * has the capacity to handle our outputs.
@@ -1488,7 +1497,6 @@ AUPlugin::connect_and_run (BufferSet& bufs, ChanMapping in_map, ChanMapping out_
        cb_offset = 0;
 
        buffers->mNumberBuffers = output_channels;
-       bool inplace = in_map == out_map;
 
        ChanCount bufs_count (DataType::AUDIO, 1);
        BufferSet& scratch_bufs = _session.get_scratch_buffers(bufs_count);