+ /* Start off by enabling forensic marking for all */
+ optional<int> for_audio;
+ if (!_output->forensic_mark_audio()) {
+ /* No forensic marking for audio */
+ for_audio = 0;
+ } else if (_output->forensic_mark_audio_up_to()) {
+ /* Forensic mark up to this channel; disabled on channels greater than this */
+ for_audio = _output->forensic_mark_audio_up_to();
+ }