diff runner/MIDIFeatureWriter.cpp @ 197:3b7ec45abd1c

Add mandatory option --json-format to JSON feature writer, in preparation for supporting multiple JSON formats (perhaps) in future

--- a/runner/MIDIFeatureWriter.cpp	Tue Sep 01 15:51:07 2015 +0100
+++ b/runner/MIDIFeatureWriter.cpp	Tue Sep 01 17:05:32 2015 +0100
@@ -39,7 +39,7 @@
 string
 MIDIFeatureWriter::getDescription() const
 {
-    return "Write features to MIDI files. All features are written as MIDI notes. If a feature has at least one value, its first value will be used as the note pitch, the second value (if present) for velocity. If a feature has units of Hz, then its pitch will be converted from frequency to an integer value in MIDI range, otherwise it will simply be rounded to the nearest integer and written directly. Multiple (up to 16) transforms can be written to a single MIDI file, where they will be given separate MIDI channel numbers.";
+    return "Write features to MIDI files. All features are written as MIDI notes. If a feature has at least one value, its first value will be used as the note pitch, the second value (if present) for velocity. If a feature has units of Hz, then its pitch will be converted from frequency to an integer value in MIDI range; otherwise it will simply be rounded to the nearest integer and written directly. (Be aware that MIDI cannot represent overlapping notes of equal pitch, so features with durations may be misrepresented if they do not have distinct enough values.) Multiple (up to 16) transforms can be written to a single MIDI file, where they will be given separate MIDI channel numbers.";
 }
 
 MIDIFeatureWriter::ParameterList