Adding webrtc-sample demos under trunk/samples.
Review URL: https://webrtc-codereview.appspot.com/1126005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3578 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/samples/js/demos/html/pranswer.html b/samples/js/demos/html/pranswer.html
new file mode 100644
index 0000000..eb807a2
--- /dev/null
+++ b/samples/js/demos/html/pranswer.html
@@ -0,0 +1,125 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>PeerConnection PRANSWER Demo</title>
+  <style>
+    video {
+      border:5px solid black;
+      width:320px;
+      height:240px;
+    }
+  </style>
+  </head>
+  <body>
+    <video id="vid1" autoplay></video>
+    <video id="vid2" autoplay></video>
+    <br>
+    <button id="btn1" onclick="start()">Call</button>
+    <button id="btn15" onclick="accept()">Accept</button>
+    <button id="btn2" onclick="stop()">Hang Up</button>
+    <script>
+//var vid1 = document.getElementById("vid1");
+//var vid2 = document.getElementById("vid2");
+btn1.disabled = true;
+btn2.disabled = true;
+var pc1,pc2;
+var localstream;
+
+function trace(txt) {
+  // This function is used for logging.
+  console.log(txt);
+}
+      
+function traceCandidate(kind, cand) {
+  trace("Candidate(" + kind + "): " + cand.label + ": " + 
+        cand.toSdp().replace("\n", ""));
+}
+
+function gotStream(stream){
+  trace("Received local stream");
+  vid1.src = webkitURL.createObjectURL(stream);
+  localstream = stream;
+  btn1.disabled = false;
+}
+
+navigator.webkitGetUserMedia({audio:true, video:true}, gotStream, function() {});
+
+function start() {
+  btn1.disabled = true;
+  btn2.disabled = false;
+  trace("Starting Call");
+  if (localstream.videoTracks.length > 0)
+    trace('Using Video device: ' + localstream.videoTracks[0].label);  // Prints audio & video device names
+  if (localstream.audioTracks.length > 0)
+    trace('Using Audio device: ' + localstream.audioTracks[0].label);
+
+  pc1 = new webkitPeerConnection00(null,iceCallback1);
+  trace("Created local peer connection object pc1"); 
+  pc2 = new webkitPeerConnection00(null,iceCallback2);
+  trace("Created remote peer connection object pc2");
+  pc2.onaddstream = gotRemoteStream; 
+
+  pc1.addStream(localstream);
+  trace("Adding Local Stream to peer connection");
+  var offer = pc1.createOffer(null);
+  trace("Created offer:\n" + offer.toSdp());
+  pc1.setLocalDescription(pc1.SDP_OFFER, offer);
+  trace("SetLocalDesc1");
+  pc2.setRemoteDescription(pc2.SDP_OFFER, offer);
+  trace("SetRemoteDesc2");
+  var answer = pc2.createAnswer(offer.toSdp(), {has_audio:true, has_video:true});
+  var sdp = answer.toSdp();
+  sdp = sdp.replace(/a=sendrecv/g, "a=inactive");
+  answer = new SessionDescription(sdp);
+  trace("Created answer:\n" + answer.toSdp());
+  pc2.setLocalDescription(pc2.SDP_PRANSWER, answer);
+  trace("SetLocalDesc2");
+  pc1.setRemoteDescription(pc1.SDP_PRANSWER, answer);
+  trace("SetRemoteDesc1");
+  pc1.startIce(); // Start finding local ice candidates. Once it finds candidates it will call icecallback
+  pc2.startIce(); //Starts finding remote ice candidates. Once it finds candidates it will call iceCallback2
+  trace("Start ICE for both local & remote");
+}
+
+function accept() {
+  var sdp = pc1.remoteDescription.toSdp();
+  sdp = sdp.replace(/a=inactive/g, "a=sendrecv");
+  var answer = new SessionDescription(sdp);
+  pc2.setLocalDescription(pc1.SDP_ANSWER, answer);
+  pc1.setRemoteDescription(pc2.SDP_ANSWER, answer);
+  trace("Set final answer:" + sdp);
+}
+
+function stop() {
+  trace("Ending Call" + "\n\n");
+  pc1.close(); 
+  pc2.close();
+  pc1=null;
+  pc2=null;
+  btn2.disabled = true;
+  btn1.disabled = false;
+}
+
+function gotRemoteStream(e){
+  vid2.src = webkitURL.createObjectURL(e.stream);
+  trace("Received Remote Stream");
+}
+
+function iceCallback1(candidate,bMore){
+  if (candidate) {
+    pc2.processIceMessage(candidate);
+    traceCandidate("local", candidate);
+  }
+}
+      
+function iceCallback2(candidate,bMore){
+  if (candidate) {
+    pc1.processIceMessage(candidate);
+    traceCandidate("remote", candidate);
+  }
+} 
+    </script>
+  </body>
+</html>
+
+