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livetrax/libs/midi++2/midicontrollable.cc

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/*
Copyright (C) 1998-99 Paul Barton-Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include <cstdio> /* for sprintf, sigh */
#include <pbd/error.h>
#include <midi++/port.h>
#include <midi++/channel.h>
#include <midi++/controllable.h>
using namespace sigc;
using namespace MIDI;
using namespace PBD;
Controllable::Controllable (Port *p, bool is_bistate)
{
control_type = none;
_control_description = "MIDI Control: none";
control_additional = (byte) -1;
bistate = is_bistate;
connections = 0;
feedback = true; // for now
/* use channel 0 ("1") as the initial channel */
midi_rebind (p, 0);
}
Controllable::~Controllable ()
{
drop_external_control ();
}
void
Controllable::midi_forget ()
{
/* stop listening for incoming messages, but retain
our existing event + type information.
*/
if (connections > 0) {
midi_sense_connection[0].disconnect ();
}
if (connections > 1) {
midi_sense_connection[1].disconnect ();
}
connections = 0;
midi_learn_connection.disconnect ();
}
void
Controllable::midi_rebind (Port *p, channel_t c)
{
if ((port = p) == 0) {
midi_forget ();
} else {
if (c >= 0) {
bind_midi (c, control_type, control_additional);
} else {
midi_forget ();
}
}
}
void
Controllable::learn_about_external_control ()
{
drop_external_control ();
if (port) {
midi_learn_connection = port->input()->any.connect (mem_fun (*this, &Controllable::midi_receiver));
learning_started ();
} else {
info << "No MIDI port specified - external control disabled" << endmsg;
}
}
void
Controllable::stop_learning ()
{
midi_learn_connection.disconnect ();
}
void
Controllable::drop_external_control ()
{
if (connections > 0) {
midi_sense_connection[0].disconnect ();
}
if (connections > 1) {
midi_sense_connection[1].disconnect ();
}
connections = 0;
midi_learn_connection.disconnect ();
control_type = none;
control_additional = (byte) -1;
}
void
Controllable::midi_sense_note_on (Parser &p, EventTwoBytes *tb)
{
midi_sense_note (p, tb, true);
}
void
Controllable::midi_sense_note_off (Parser &p, EventTwoBytes *tb)
{
midi_sense_note (p, tb, false);
}
void
Controllable::midi_sense_note (Parser &p, EventTwoBytes *msg, bool is_on)
{
if (!bistate) {
set_value (msg->note_number/127.0);
} else {
/* Note: parser handles the use of zero velocity to
mean note off. if we get called with is_on=true, then we
got a *real* note on.
*/
if (msg->note_number == control_additional) {
set_value (is_on ? 1 : 0);
}
}
}
void
Controllable::midi_sense_controller (Parser &, EventTwoBytes *msg)
{
if (control_additional == msg->controller_number) {
if (!bistate) {
set_value (msg->value/127.0);
} else {
if (msg->value > 64.0) {
set_value (1);
} else {
set_value (0);
}
}
}
}
void
Controllable::midi_sense_program_change (Parser &p, byte msg)
{
/* XXX program change messages make no sense for bistates */
if (!bistate) {
set_value (msg/127.0);
}
}
void
Controllable::midi_sense_pitchbend (Parser &p, pitchbend_t pb)
{
/* pitchbend messages make no sense for bistates */
/* XXX gack - get rid of assumption about typeof pitchbend_t */
set_value ((pb/(float) SHRT_MAX));
}
void
Controllable::midi_receiver (Parser &p, byte *msg, size_t len)
{
/* we only respond to channel messages */
if ((msg[0] & 0xF0) < 0x80 || (msg[0] & 0xF0) > 0xE0) {
return;
}
/* if the our port doesn't do input anymore, forget it ... */
if (!port->input()) {
return;
}
bind_midi ((channel_t) (msg[0] & 0xf), eventType (msg[0] & 0xF0), msg[1]);
learning_stopped ();
}
void
Controllable::bind_midi (channel_t chn, eventType ev, MIDI::byte additional)
{
char buf[64];
drop_external_control ();
control_type = ev;
control_channel = chn;
control_additional = additional;
if (port == 0 || port->input() == 0) {
return;
}
Parser& p = *port->input();
int chn_i = chn;
switch (ev) {
case MIDI::off:
midi_sense_connection[0] = p.channel_note_off[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_note_off));
/* if this is a bistate, connect to noteOn as well,
and we'll toggle back and forth between the two.
*/
if (bistate) {
midi_sense_connection[1] = p.channel_note_on[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_note_on));
connections = 2;
} else {
connections = 1;
}
_control_description = "MIDI control: NoteOff";
break;
case MIDI::on:
midi_sense_connection[0] = p.channel_note_on[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_note_on));
if (bistate) {
midi_sense_connection[1] = p.channel_note_off[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_note_off));
connections = 2;
} else {
connections = 1;
}
_control_description = "MIDI control: NoteOn";
break;
case MIDI::controller:
midi_sense_connection[0] = p.channel_controller[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_controller));
connections = 1;
snprintf (buf, sizeof (buf), "MIDI control: Controller %d", control_additional);
_control_description = buf;
break;
case MIDI::program:
if (!bistate) {
midi_sense_connection[0] = p.channel_program_change[chn_i].connect
(mem_fun (*this,
&Controllable::midi_sense_program_change));
connections = 1;
_control_description = "MIDI control: ProgramChange";
}
break;
case MIDI::pitchbend:
if (!bistate) {
midi_sense_connection[0] = p.channel_pitchbend[chn_i].connect
(mem_fun (*this, &Controllable::midi_sense_pitchbend));
connections = 1;
_control_description = "MIDI control: Pitchbend";
}
break;
default:
break;
}
}
void
Controllable::set_control_type (channel_t chn, eventType ev, MIDI::byte additional)
{
bind_midi (chn, ev, additional);
}
bool
Controllable::get_control_info (channel_t& chn, eventType& ev, byte& additional)
{
if (control_type == none) {
chn = -1;
return false;
}
ev = control_type;
chn = control_channel;
additional = control_additional;
return true;
}
void
Controllable::send_midi_feedback (float val)
{
byte msg[3];
if (port == 0 || control_type == none) {
return;
}
msg[0] = (control_type & 0xF0) | (control_channel & 0xF);
msg[1] = control_additional;
msg[2] = (byte) (val * 127.0f);
port->write (msg, 3);
}