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sound-jstim.js
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sound-jstim.js
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/* play stimuli by making requests to jstim(server) through zeromq sockets */
const winston = require("winston");
const _ = require("underscore");
const zmq = require("zeromq");
const util = require("./util");
function aplayer(params, name, pub) {
const par = {
req: "ipc:///tmp/org.meliza.jill/default/jstimserver/req",
pub: "ipc:///tmp/org.meliza.jill/default/jstimserver/pub",
timeout: 1000
}
const meta = {
type: "sound",
name: "sound playback",
dir: "output",
variables: {
server: ["stopped", "running"],
playing: [false, true],
stimulus: [null, ".wav"]
},
};
const state = {
server: "stopped",
stimulus: null, // path of stimulus file
playing: false // set to true to start playback
// TODO: report sample position?
};
// connect to jstimserver sockets
const req_sock = zmq.socket("dealer");
const sub_sock = zmq.socket("sub");
req_sock.connect(par.req);
sub_sock.connect(par.pub);
sub_sock.subscribe("");
// populate stimulus list
function update_stims() {
req_sock.send("STIMLIST");
req_sock.once("message", (msg) => {
const server_params = JSON.parse(msg);
if (server_params.stimuli.length > 0)
meta.stimuli = {
files: _.map(server_params.stimuli, (x) => { return x.name }),
properties: _.object(_.map(server_params.stimuli,
(x) => { return [x.name, _.omit(x, "name")] }))
};
winston.info("received stimulus list (n=%d) from jstim server", meta.stimuli.files.length);
state.server = "running";
pub.emit("state-changed", name, state);
});
}
// wait 1 s for a reply and if not log a warning
setTimeout(function() {
if (state.server != "running")
winston.warn("timeout waiting for jstimserver; stimulus playback may be unavailable");
}, 1000);
// set up listener for pub sock
sub_sock.on("message", (msg) => {
const time = util.now();
const msg_parts = msg.toString("utf-8").split(" ");
winston.debug("jstimserver says: ", msg_parts);
if (msg_parts[0] == "PLAYING") {
state.playing = true;
state.stimulus = msg_parts[1];
}
else if (msg == "DONE") {
state.playing = false;
state.stimulus = null;
}
else if (msg == "STOPPING") {
// warn user, because a server shutdown will ruin any running
// experiments.
pub.emit("warning", name, "jstimserver shut down; stimuli won't be playing");
state.server = "stopped";
}
else if (msg == "STARTING") {
winston.info("jstimserver reconnected");
update_stims();
}
pub.emit("state-changed", name, state, time);
});
const me = {
req: function(msg, data, rep) {
winston.debug("req to sound-jstim: %s", msg, data)
let jstim_replied = false;
function check_timeout() {
winston.silly("checking for server response: jstim_replied=%s", jstim_replied);
if (!jstim_replied)
pub.emit("warning", name, "jstimserver response timed out ");
rep("jstimserver response timed out");
}
if (msg == "change-state") {
if (state.server != "running") {
pub.emit("warning", name,
"requested stimulus playback but jstimserver is not running");
rep("not connected to jstimserver");
return;
}
if (data.playing) {
let request = "PLAY " + data.stimulus;
req_sock.once("message", (msg) => {
jstim_replied = true;
if (msg == "BUSY")
rep("playback already in progress");
else if (msg == "BADSTIM")
rep("no such stimulus");
else if (msg == "BADCMD")
rep("protocol error: jstimserver rejected request");
else if (msg == "OK")
rep();
else
rep("protocol error: unexpected response from jstimserver");
});
req_sock.send(request);
_.delay(check_timeout, par.timeout);
}
else {
let request = "INTERRUPT";
req_sock.once("message", (msg) => {
jstim_replied = true;
if (msg == "NOTPLAYING") {
// no error is emitted so that users can just
// request a stop w/o worrying about what the
// current state is
winston.info("InterrruptButNotPlaying");
rep();
}
else if (msg == "BADCMD")
rep("protocol error: jstimserver rejected request");
else if (msg == "OK") {
winston.info("InterruptOk");
rep();
}
else
rep("protocol error: unexpected response from jstimserver");
});
req_sock.send(request);
_.delay(check_timeout, par.timeout);
}
}
else if (msg == "reset-state")
rep();
else if (msg == "get-state")
rep(null, state);
else if (msg == "get-meta")
rep(null, meta);
else if (msg == "get-params")
rep(null, par);
else
rep("invalid or unsupported REQ type");
},
disconnect: function() {
winston.info("disconnecting from jstimserver");
req_sock.close();
sub_sock.close();
}
}
update_stims();
return me;
}
module.exports = aplayer;