Fix a bug in the SDP parser in AppRTCMobile.

webrtc/examples/objc/AppRTCMobile/tests/ARDSDPUtils_xctest.mm

 /*
  *  Copyright 2017 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #import <Foundation/Foundation.h>
 #import <XCTest/XCTest.h>
 
 #import "WebRTC/RTCSessionDescription.h"
 
 #import "ARDSDPUtils.h"
 
 @interface ARDSDPUtilsTest : XCTestCase
 @end
 
 @implementation ARDSDPUtilsTest
 
 - (void)testPreferVideoCodecH264 {
-  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
-                    "a=rtpmap:120 H264/90000\n"
-                    "a=rtpmap:97 H264/90000\n");
-  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 120 97 100 116 117 96\n"
-                            "a=rtpmap:120 H264/90000\n"
-                            "a=rtpmap:97 H264/90000\n");
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\r\n"
+                    "a=rtpmap:120 H264/90000\r\n"
+                    "a=rtpmap:97 H264/90000\r\n");
+  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 120 97 100 116 117 96\r\n"
+                            "a=rtpmap:120 H264/90000\r\n"
+                            "a=rtpmap:97 H264/90000\r\n");
   [self preferVideoCodec:@"H264" sdp:sdp expected:expectedSdp];
 }
 
 - (void)testPreferVideoCodecVP8 {
-  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
-                    "a=rtpmap:116 VP8/90000\n");
-  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 116 100 117 96 120 97\n"
-                            "a=rtpmap:116 VP8/90000\n");
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\r\n"
+                    "a=rtpmap:116 VP8/90000\r\n");
+  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 116 100 117 96 120 97\r\n"
+                            "a=rtpmap:116 VP8/90000\r\n");
   [self preferVideoCodec:@"VP8" sdp:sdp expected:expectedSdp];
 }
 
 - (void)testNoMLine {
-  NSString *sdp = @("a=rtpmap:116 VP8/90000\n");
+  NSString *sdp = @("a=rtpmap:116 VP8/90000\r\n");
   [self preferVideoCodec:@"VP8" sdp:sdp expected:sdp];
 }
 
 - (void)testMissingCodec {
-  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
-                    "a=rtpmap:116 VP8/90000\n");
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\r\n"
+                    "a=rtpmap:116 VP8/90000\r\n");
   [self preferVideoCodec:@"foo" sdp:sdp expected:sdp];
 }
 
 #pragma mark - Helpers
 
 - (void)preferVideoCodec:(NSString *)codec
                      sdp:(NSString *)sdp
                 expected:(NSString *)expectedSdp{
   RTCSessionDescription* desc =
     [[RTCSessionDescription alloc] initWithType:RTCSdpTypeOffer sdp:sdp];
   RTCSessionDescription *outputDesc =
     [ARDSDPUtils descriptionForDescription:desc
                        preferredVideoCodec:codec];
   XCTAssertTrue([outputDesc.description rangeOfString:expectedSdp].location != NSNotFound);
 }
 @end