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/*
* Copyright 2009,2010,2011 Reality Jockey, Ltd.
* info@rjdj.me
* http://rjdj.me/
*
* This file is part of ZenGarden.
*
* ZenGarden is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ZenGarden 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with ZenGarden. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "MessageMetro.h"
#include "PdGraph.h"
message::Object *MessageMetro::new_object(pd::Message *init_message, PdGraph *graph) {
return new MessageMetro(init_message, graph);
}
MessageMetro::MessageMetro(pd::Message *init_message, PdGraph *graph) : message::Object(2, 1, graph) {
// default to interval of one second
intervalInMs = init_message->is_float(0) ? (double) init_message->get_float(0) : 1000.0;
pendingMessage = NULL;
}
MessageMetro::~MessageMetro() {
// nothign to do. pendingMessage object is owned by context.
}
string MessageMetro::toString() {
char str[snprintf(NULL, 0, "%s %g", get_object_label(), intervalInMs)+1];
snprintf(str, sizeof(str), "%s %g", get_object_label(), intervalInMs);
return string(str);
}
void MessageMetro::process_message(int inlet_index, pd::Message *message) {
switch (inlet_index) {
case 0: {
switch (message->get_type(0)) {
case FLOAT: {
// any non-zero float may start the metro
(message->get_float(0) == 0.0f) ? stopMetro() : startMetro(message->get_timestamp());
break;
}
case SYMBOL: {
if (message->is_symbol_str(0, "stop")) {
stopMetro();
}
break;
}
case BANG: {
startMetro(message->get_timestamp());
break;
}
default: {
break;
}
}
break;
}
case 1: {
if (message->is_float(0)) {
intervalInMs = (double) message->get_float(0);
}
break;
}
default: {
break;
}
}
}
void MessageMetro::send_message(int outlet_index, pd::Message *message) {
// schedule the pending message before the current one is sent so that if a stop message
// arrives at this object while in this function, then the next message can be cancelled
pendingMessage = PD_MESSAGE_ON_STACK(1);
pendingMessage->from_timestamp_and_bang(message->get_timestamp() + intervalInMs);
pendingMessage = graph->schedule_message(this, 0, pendingMessage);
message::Object::send_message(outlet_index, message);
}
void MessageMetro::startMetro(double timestamp) {
// Ensure that there is no pending message for this metro. If there is, then cancel it.
// This allows a metro to be banged multiple times and always restart the timing from the most
// recently received bang.
stopMetro();
pd::Message *outgoing_message = PD_MESSAGE_ON_STACK(1);
outgoing_message->from_timestamp_and_bang(timestamp);
send_message(0, outgoing_message);
}
void MessageMetro::stopMetro() {
if (pendingMessage != NULL) {
graph->cancel_message(this, 0, pendingMessage);
pendingMessage = NULL;
}
}