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