Follow MIDI control values with automation faders.

Fixes bug #6166 (except record).

This attempts to follow the "current" control value somewhat aggressively:

* On locate, slider is set to the value from the top region at the new
  transport position.

* Playback or MIDI input is followed "live".

* Whenever the slider is moved (including automatically), that value is emitted
  as an immediate event to keep external gear in sync.

General idea is that the Ardour slider should act as a mirror of an external
hardware knob, and both should be synced to whatever the control is at the
current transport position.  Since we lack real playback/touch/etc modes for
these for now, we must choose one behaviour, and this seems like the most
reasonable one.

Follow is handled in the audio thread, which is probably not ideal, but since
these controls have no lists and do not record, should be fine.  Probably.

1 files changed, 15 insertions, 0 deletions

diff --git a/libs/evoral/evoral/MIDIEvent.hpp b/libs/evoral/evoral/MIDIEvent.hpp
index 9b1d72c400..f0c9c74589 100644
--- a/libs/evoral/evoral/MIDIEvent.hpp
+++ b/libs/evoral/evoral/MIDIEvent.hpp
@@ -104,6 +104,21 @@ public:
 		return this->size() == 10    && this->_buf[0] == 0xf0 && this->_buf[1] == 0x7f && 
 		       this->_buf[3] == 0x01 && this->_buf[4] == 0x01;
 	}
+
+	inline uint16_t value() const {
+		switch (type()) {
+		case MIDI_CMD_CONTROL:
+			return cc_value();
+		case MIDI_CMD_BENDER:
+			return pitch_bender_value();
+		case MIDI_CMD_NOTE_PRESSURE:
+			return aftertouch();
+		case MIDI_CMD_CHANNEL_PRESSURE:
+			return channel_pressure();
+		default:
+			return 0;
+		}
+	}
 };
 
 } // namespace Evoral