Add ability to receive calls for iOS

BUG=2701
R=fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7989005

Patch from Sajid Hussain <shussain@temasys.com.sg>.

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5518 4adac7df-926f-26a2-2b94-8c16560cd09d

AUTHORS

@@ -20,3 +20,4 @@ MIPS Technologies
 Mozilla Foundation
 Opera Software ASA
 Vonage Holdings Corp.
+Temasys Communications

talk/examples/ios/AppRTCDemo/APPRTCAppClient.h

@@ -47,6 +47,7 @@
 
 @property(nonatomic, assign) id<ICEServerDelegate> ICEServerDelegate;
 @property(nonatomic, assign) id<GAEMessageHandler> messageHandler;
+@property(nonatomic, assign) BOOL initiator;
 
 - (void)connectToRoom:(NSURL *)room;
 - (void)sendData:(NSData *)data;

talk/examples/ios/AppRTCDemo/APPRTCAppClient.m

@@ -61,6 +61,7 @@
 @synthesize sendQueue = _sendQueue;
 @synthesize token = _token;
 @synthesize verboseLogging = _verboseLogging;
+@synthesize initiator = _initiator;
 
 - (id)init {
   if (self = [super init]) {
@@ -272,6 +273,7 @@
   [self maybeLogMessage:
       [NSString stringWithFormat:@"Base URL: %@", self.baseURL]];
 
+  self.initiator = [[self findVar:@"initiator" strippingQuotes:NO] boolValue];
   self.token = [self findVar:@"channelToken" strippingQuotes:YES];
   if (!self.token)
     return;

talk/examples/ios/AppRTCDemo/APPRTCAppDelegate.m

@@ -229,6 +229,10 @@
 #pragma mark - GAEMessageHandler methods
 
 - (void)onOpen {
+  if (!self.client.initiator) {
+      [self displayLogMessage:@"Callee; waiting for remote offer"];
+      return;
+  }
   [self displayLogMessage:@"GAE onOpen - create offer."];
   RTCPair *audio =
       [[RTCPair alloc] initWithKey:@"OfferToReceiveAudio" value:@"true"];
@@ -400,10 +404,34 @@
 
   [self displayLogMessage:@"SDP onSuccess() - possibly drain candidates"];
   dispatch_async(dispatch_get_main_queue(), ^(void) {
-    // TODO(hughv): Handle non-initiator case.  http://s10/46622051
-    if (self.peerConnection.remoteDescription) {
-      [self displayLogMessage:@"SDP onSuccess - drain candidates"];
-      [self drainRemoteCandidates];
+    if (!self.client.initiator) {
+        if (self.peerConnection.remoteDescription
+                && !self.peerConnection.localDescription) {
+            [self displayLogMessage:@"Callee, setRemoteDescription succeeded"];
+            RTCPair *audio =
+                [[RTCPair alloc]
+                    initWithKey:@"OfferToReceiveAudio" value:@"true"];
+            // TODO(hughv): Add video.
+            // RTCPair *video =
+            //    [[RTCPair alloc]
+            //        initWithKey:@"OfferToReceiveVideo" value:@"true"];
+            NSArray *mandatory = @[ audio /*, video*/ ];
+            RTCMediaConstraints *constraints =
+                [[RTCMediaConstraints alloc]
+                    initWithMandatoryConstraints:mandatory
+                    optionalConstraints:nil];
+            [self.peerConnection
+                createAnswerWithDelegate:self constraints:constraints];
+            [self displayLogMessage:@"PC - createAnswer."];
+        } else {
+            [self displayLogMessage:@"SDP onSuccess - drain candidates"];
+            [self drainRemoteCandidates];
+        }
+    } else {
+        if (self.peerConnection.remoteDescription) {
+            [self displayLogMessage:@"SDP onSuccess - drain candidates"];
+            [self drainRemoteCandidates];
+        }
     }
   });
 }