index.js

var plugin = require('rtc-core/plugin');
var detect = require('rtc-core/detect');

// patch navigator getUserMedia
navigator.getUserMedia = navigator.getUserMedia ||
  detect.call(navigator, 'getUserMedia');

/**
  # rtc-capture

  Roughly equivalent to the
  [`getUserMedia`](https://www.npmjs.org/package/getusermedia) package but with
  support for rtc.io plugins.

  ## Example Usage

  <<< examples/simple.js

  ## Example with using Plugins

  <<< examples/plugins.js

  ## Reference

  ### `capture(constraints, opts?, callback)`

  Capture media with the supplied `constraints`.  If an `opts` argument is
  supplied look for plugins that may change the behaviour of the capture
  operation.

**/
module.exports = function(constraints, opts, callback) {
  var pinst;

  function handleCapture(stream) {
    callback(null, stream);
  }

  function capture() {
    // Check if we have support for the promises-based `navigator.mediaDevices.getUserMedia` option
    if (navigator.mediaDevices && typeof navigator.mediaDevices.getUserMedia === 'function') {
      return navigator.mediaDevices.getUserMedia(constraints).then(handleCapture).catch(callback);
    }
    // If we don't, default back to the old detected getUserMedia options
    if (typeof navigator.getUserMedia != 'function') {
      return callback(new Error('getUserMedia not supported'));
    }
    return navigator.getUserMedia(constraints, handleCapture, callback);
  }

  if (typeof opts == 'function') {
    callback = opts;
    opts = {};
  }

  // see if we are using a plugin
  pinst = plugin((opts || {}).plugins);
  if (pinst) {
    return pinst.init(opts, function(err) {
      if (err) {
        return callback(err);
      }

      if (typeof navigator.getUserMedia != 'function') {
        return callback(new Error('plugin does not support media capture'));
      }
      capture();
    });
  }

  capture();
};