omxcontrol/index.js

Nodejs module to control omxplayer. Specifically written for the raspberry pi

var exec = require("child_process").execFile;
var parseurl = require("url");

var pipe = false;
var map = false;
var DEFAULT_PATH = "/omx";

var BINARY = "omxplayer";

function omx(mapper) {
    map = mapper;
    return omx.express;
}

omx.express = function (req, res, next) {
    if (req.path.indexOf(DEFAULT_PATH) === 0) {
        //replace + and decode
        path = decodeURIComponent(req.path.replace(/\+/g, " "));
        //remove leading and trailing /
        path = path.replace(/^\/|\/$/g, "");
        //split and remove leading path
        var parts = path.split("/");
        parts.shift();
        var command = parts.shift();
        console.log("executing", command, parts);
        if (omx[command]) {
            if (command === "start") {
                omx.start(
                    parts.join("/") + "?" + parseurl.parse(req.url).query
                );
            } else {
                omx[command].apply(this, parts);
            }
            //prevent anything else from being served from this subpath
            res.end("executed " + command);
            return;
        }
    }
    next();
};

omx.start = function (fn, onFinish) {
    if (!pipe) {
        pipe = "omxcontrol";
        exec("mkfifo", [pipe]);
    }
    if (map) {
        map(fn, cb);
    } else {
        cb(fn);
    }

    function cb(fn) {
        console.log(fn);
        exec(
            BINARY,
            ["-o", "hdmi", '"' + fn + '"', "<", pipe],
            function (error, stdout, stderr) {
                console.log(stdout);
                if (error) {
                    console.log(error);
                }
                if (onFinish) {
                    onFinish();
                }
            }
        );
        exec("echo", [".", ">", pipe]);
    }
};

omx.sendKey = function (key) {
    if (!pipe) return;
    exec("echo", ["-n", key, ">", pipe]);
};

omx.mapKey = function (command, key, then) {
    omx[command] = function () {
        omx.sendKey(key);
        if (then) {
            then();
        }
    };
};

omx.mapKey("pause", "p");
omx.mapKey("quit", "q", function () {
    exec("rm", [pipe]);
    pipe = false;
});
omx.mapKey("play", ".");
omx.mapKey("forward", "$'\\x1b\\x5b\\x43'");
omx.mapKey("backward", "$'\\x1b\\x5b\\x44'");

module.exports = omx;