diff options
Diffstat (limited to 'libs/ardour/audio_unit.cc')
| -rw-r--r-- | libs/ardour/audio_unit.cc | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc index e1ef883747..46b7c6746d 100644 --- a/libs/ardour/audio_unit.cc +++ b/libs/ardour/audio_unit.cc @@ -1667,17 +1667,19 @@ AUPlugin::connect_and_run (BufferSet& bufs, for (uint32_t i = 0; i < cnt; ++i) { buffers->mBuffers[i].mNumberChannels = 1; - buffers->mBuffers[i].mDataByteSize = nframes * sizeof (Sample); - /* setting this to 0 indicates to the AU that it can provide buffers here + /* setting this to 0 indicates to the AU that it *can* provide buffers here * if necessary. if it can process in-place, it will use the buffers provided * as input by ::render_callback() above. * * a non-null values tells the plugin to render into the buffer pointed * at by the value. + * https://developer.apple.com/documentation/audiotoolbox/1438430-audiounitrender?language=objc */ if (inplace) { + buffers->mBuffers[i].mDataByteSize = 0; buffers->mBuffers[i].mData = 0; } else { + buffers->mBuffers[i].mDataByteSize = nframes * sizeof (Sample); bool valid = false; uint32_t idx = out_map.get (DataType::AUDIO, i + busoff, &valid); if (valid) { @@ -1704,7 +1706,12 @@ AUPlugin::connect_and_run (BufferSet& bufs, for (uint32_t i = 0; i < limit; ++i) { bool valid = false; uint32_t idx = out_map.get (DataType::AUDIO, i + busoff, &valid); - if (!valid) continue; + if (!valid) { + continue; + } + if (buffers->mBuffers[i].mData == 0 || buffers->mBuffers[i].mNumberChannels != 1) { + continue + } used_outputs.set (i + busoff); Sample* expected_buffer_address = bufs.get_audio (idx).data (offset); if (expected_buffer_address != buffers->mBuffers[i].mData) { |