From 687ec6df4dac76a1846fdc512afd87e35abacee1 Mon Sep 17 00:00:00 2001
From: Simon Eisenmann <simon@struktur.de>
Date: Tue, 1 Mar 2016 17:27:19 +0100
Subject: [PATCH] Brought back mediaDevices wrapper for gUM for Firefox >= 38
 fixing #263 and #264.

---
 static/js/mediastream/usermedia.js | 81 +++++++++++++++++++++++++++++-
 1 file changed, 80 insertions(+), 1 deletion(-)

diff --git a/static/js/mediastream/usermedia.js b/static/js/mediastream/usermedia.js
index 0fa33f0c..4cb5af78 100644
--- a/static/js/mediastream/usermedia.js
+++ b/static/js/mediastream/usermedia.js
@@ -25,7 +25,86 @@ define(['jquery', 'underscore', 'audiocontext', 'mediastream/dummystream', 'webr
 	// Create AudioContext singleton, if supported.
 	var context = AudioContext ? new AudioContext() : null;
 
-	var getUserMedia = window.getUserMedia;
+	// Converter helpers to convert media constraints to new API.
+	var mergeConstraints = function(constraints, k, v, mandatory) {
+		var prefix = k.substring(0, 3);
+		switch (prefix) {
+		case "min":
+		case "max":
+			var suffix = k[3].toLowerCase()+k.substring(4);
+			if (!constraints.hasOwnProperty(suffix)) {
+				constraints[suffix]={};
+			}
+			if (mandatory && prefix === "min" && constraints[suffix].hasOwnProperty(prefix)) {
+				// Use existing min constraint as ideal.
+				constraints[suffix].ideal = constraints[suffix].min;
+			}
+			constraints[suffix][prefix]=v;
+			break;
+		default:
+			constraints[k] = v;
+			break;
+		}
+	};
+	var convertConstraints = function(constraints) {
+		if (!constraints) {
+			return false;
+		}
+		if (!constraints.hasOwnProperty("optional") && !constraints.hasOwnProperty("mandatory")) {
+			// No old style members.
+			return constraints;
+		}
+		var c = {};
+		// Process optional constraints.
+		if (constraints.optional) {
+			_.each(constraints.optional, function(o) {
+				_.each(o, function(v, k) {
+					mergeConstraints(c, k, v);
+				})
+			});
+		}
+		// Process mandatory constraints.
+		if (constraints.mandatory) {
+			_.each(constraints.mandatory, function(v, k) {
+				mergeConstraints(c, k, v, true);
+			});
+		}
+		// Fastpath.
+		if (_.isEmpty(c)) {
+			return true;
+		}
+		// Use ideal if there is only one value set.
+		_.each(c, function(v, k) {
+			if (_.isObject(v)) {
+				var values = _.values(v);
+				if (values.length === 1) {
+					// Use as ideal value if only one given.
+					c[k] = {ideal: values[0]};
+				}
+			}
+		});
+		return c;
+	};
+	// Adapter to support navigator.mediaDevices API.
+	// http://w3c.github.io/mediacapture-main/getusermedia.html#mediadevices
+	var getUserMedia = (function() {
+		if (window.webrtcDetectedBrowser === "firefox"&& window.webrtcDetectedVersion >= 38) {
+			console.info("Enabled mediaDevices adapter ...");
+			return function(constraints, success, error) {
+				// Full constraints syntax with plain values and ideal-algorithm supported in FF38+.
+				// Note on FF32-37: Plain values and ideal are not supported.
+				// See https://wiki.mozilla.org/Media/getUserMedia for details.
+				// Examples here: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia
+				var c = {audio: convertConstraints(constraints.audio), video: convertConstraints(constraints.video)};
+				// mediaDevices API returns a promise.
+				console.log("Constraints for mediaDevices", c);
+				window.navigator.mediaDevices.getUserMedia(c).then(success).catch(error);
+			}
+		} else {
+			// Use existing adapter.
+			return window.getUserMedia;
+		}
+	})();
 
 	var stopUserMediaStream = (function() {
 		return function(stream) {